<?php
/**
 * DeclarationTVA Class
 * French CA-3 VAT Declaration Module for Dolibarr
 * MVP Version - Phase 1
 */

class DeclarationTVA
{
    /**
     * @var DoliDB Database handler
     */
    public $db;

    /**
     * @var int Entity ID
     */
    public $entity;

    /**
     * @var string Error message
     */
    public $error;

    /**
     * @var int Declaration ID
     */
    public $rowid;

    /**
     * @var int Period ID
     */
    public $period_id;

    /**
     * @var string Declaration number
     */
    public $declaration_number;

    /**
     * @var string Declaration name
     */
    public $declaration_name;

    /**
     * @var string Start date
     */
    public $start_date;

    /**
     * @var string End date
     */
    public $end_date;

    /**
     * @var string Status
     */
    public $status;

    /**
     * Constructor
     *
     * @param DoliDB $db Database handler
     * @param int $entity Entity ID
     */
    public function __construct($db, $entity = 1)
    {
        $this->db = $db;
        $this->entity = $entity;
    }

    /**
     * Fetch declaration by ID
     *
     * @param int $id Declaration ID
     * @return int 1 if found, 0 if not found, -1 if error
     */
    public function fetch($id)
    {
        $sql = "SELECT * FROM " . MAIN_DB_PREFIX . "declarationtva_declarations 
                WHERE rowid = " . (int)$id . " AND entity = " . $this->entity;
        
        $result = $this->db->query($sql);
        if ($result) {
            $obj = $this->db->fetch_object($result);
            if ($obj) {
                $this->rowid = $obj->rowid;
                $this->period_id = $obj->period_id;
                $this->declaration_number = $obj->declaration_number;
                $this->declaration_name = $obj->declaration_name;
                $this->start_date = $obj->start_date;
                $this->end_date = $obj->end_date;
                $this->status = $obj->status;
                $this->created_date = $obj->created_date;
                return 1;
            }
        }
        return 0;
    }

    /**
     * Create a new declaration for a period
     *
     * @param int $period_id Period ID
     * @return int Declaration ID or -1 if error
     */
    public function createDeclaration($period_id)
    {
        global $user;

        $this->db->begin();

        // Get period information
        $period = $this->getPeriod($period_id);
        if (!$period) {
            $this->error = "Period not found";
            $this->db->rollback();
            return -1;
        }

        // Generate declaration number
        $declaration_number = $this->generateDeclarationNumber($period);

        // Create declaration record
        $sql = "INSERT INTO " . MAIN_DB_PREFIX . "declarationtva_declarations 
                (entity, period_id, declaration_number, status, created_date) 
                VALUES (" . $this->entity . ", " . $period_id . ", '" . $declaration_number . "', 'draft', NOW())";

        $result = $this->db->query($sql);
        if (!$result) {
            $this->error = "Error creating declaration: " . $this->db->lasterror();
            $this->db->rollback();
            return -1;
        }

        $declaration_id = $this->db->last_insert_id(MAIN_DB_PREFIX . "declarationtva_declarations");

        // Calculate CA-3 amounts
        $this->calculateCA3Amounts($declaration_id, $period);

        $this->db->commit();
        return $declaration_id;
    }

    /**
     * Create a new declaration with specific dates
     *
     * @param string $start_date Start date (YYYY-MM-DD)
     * @param string $end_date End date (YYYY-MM-DD)
     * @param string $declaration_name Declaration name
     * @return int Declaration ID or -1 if error
     */
    public function createDeclarationWithDates($start_date, $end_date, $declaration_name = '')
    {
        global $user;

        $this->db->begin();

        // Generate declaration number
        $declaration_number = $this->generateDeclarationNumberFromDates($start_date, $end_date);

        // Create declaration record
        $sql = "INSERT INTO " . MAIN_DB_PREFIX . "declarationtva_declarations 
                (entity, period_id, declaration_number, declaration_name, start_date, end_date, status, created_date) 
                VALUES (" . $this->entity . ", 0, '" . $declaration_number . "', '" . $this->db->escape($declaration_name) . "', '" . $start_date . "', '" . $end_date . "', 'draft', NOW())";

        $result = $this->db->query($sql);
        if (!$result) {
            $this->error = "Error creating declaration: " . $this->db->lasterror();
            $this->db->rollback();
            return -1;
        }

        $declaration_id = $this->db->last_insert_id(MAIN_DB_PREFIX . "declarationtva_declarations");

        // Calculate CA-3 amounts
        $period = array('start_date' => $start_date, 'end_date' => $end_date);
        $this->calculateCA3Amounts($declaration_id, $period);

        $this->db->commit();
        return $declaration_id;
    }

    /**
     * Calculate CA-3 amounts for a declaration
     *
     * @param int $declaration_id Declaration ID
     * @param array $period Period information
     * @return bool Success
     */
    public function calculateCA3Amounts($declaration_id, $period)
    {
        // Get account mappings grouped by CA-3 line
        $mappings = $this->getAccountMappings();
        
        // Group mappings by CA-3 line
        $grouped_mappings = array();
        foreach ($mappings as $mapping) {
            $ca3_line = $mapping['ca3_line'];
            if (!isset($grouped_mappings[$ca3_line])) {
                $grouped_mappings[$ca3_line] = array();
            }
            $grouped_mappings[$ca3_line][] = $mapping;
        }

        // Define all CA-3 lines that should be processed
        $all_ca3_lines = array('A1', 'A2', 'A3', 'A4', 'A5', 'E1', 'E2', 'E3', 'E4', 'E5', 'E6', 'F1', 'F2', 'F6', 'F7', 'F8', '08', '09', '9B', '17', '18', '19', '20', '21', '22', '25', '26', '28', '29');

        $total_vat_collected = 0;
        $total_vat_deductible = 0;

        // Process ALL CA-3 lines (even those without mappings)
        foreach ($all_ca3_lines as $ca3_line) {
            $line_total_base = 0;
            $line_total_vat = 0;
            $line_total_amount = 0;
            $account_labels = array();
            
            // Special handling for lines 08, 09, 9B (need separate base and VAT accounts)
            if (in_array($ca3_line, array('08', '09', '9B'))) {
                // Get base accounts (sales)
                $base_mappings = isset($grouped_mappings[$ca3_line . '_BASE']) ? $grouped_mappings[$ca3_line . '_BASE'] : array();
                foreach ($base_mappings as $mapping) {
                    $amounts = $this->getAccountAmounts($mapping['account_code'], $period['start_date'], $period['end_date']);
                    $line_total_base += $amounts['base_amount'];
                    $account_labels[] = $mapping['account_label'] . ' (base)';
                }
                
                // Get VAT accounts
                $vat_mappings = isset($grouped_mappings[$ca3_line . '_VAT']) ? $grouped_mappings[$ca3_line . '_VAT'] : array();
                foreach ($vat_mappings as $mapping) {
                    $amounts = $this->getAccountAmounts($mapping['account_code'], $period['start_date'], $period['end_date']);
                    $line_total_vat += $amounts['vat_amount'];
                    $account_labels[] = $mapping['account_label'] . ' (VAT)';
                }
                
                $line_total_amount = $line_total_base + $line_total_vat;
            } else {
                // Normal processing for other lines
                if (isset($grouped_mappings[$ca3_line])) {
                    foreach ($grouped_mappings[$ca3_line] as $mapping) {
                        $amounts = $this->getAccountAmounts($mapping['account_code'], $period['start_date'], $period['end_date']);
                        
                        $line_total_base += $amounts['base_amount'];
                        $line_total_vat += $amounts['vat_amount'];
                        $line_total_amount += $amounts['total_amount'];
                        $account_labels[] = $mapping['account_label'];
                        
                    }
                }
            }
            
            // Create CA-3 line record with summed amounts (even if zero)
            $combined_amounts = array(
                'base_amount' => $line_total_base,
                'vat_amount' => $line_total_vat,
                'total_amount' => $line_total_amount
            );
            
            $combined_label = !empty($account_labels) ? implode(', ', $account_labels) : 'No accounts mapped';
            
            // Truncate label if too long to prevent database issues (keep some buffer)
            if (strlen($combined_label) > 1000) {
                $combined_label = substr($combined_label, 0, 997) . '...';
            }
            
            $this->createCA3Line($declaration_id, $ca3_line, $combined_label, $combined_amounts);
            

            // Update totals - only VAT amounts from sections B and C
            if (in_array($ca3_line, ['08', '09', '9B'])) {
                // Section B: VAT amounts only
                $total_vat_collected += $line_total_vat;
            } elseif (in_array($ca3_line, ['19', '20', '21', '22'])) {
                // Section B sub-section: VAT deductible amounts
                $total_vat_deductible += $line_total_vat;
            }
        }

        
        // Calculate line 16: Subtotal of lines 08, 09, 9B (for user reference)
        $this->calculateLine16($declaration_id);
        
        // Calculate line 23: Subtotal of lines 20, 21, 22 (for user reference)
        $this->calculateLine23($declaration_id);
        
        // Calculate D-section result lines (25, 26, 28, 29)
        $this->calculateDSectionLines($declaration_id, $total_vat_collected, $total_vat_deductible);

        // Calculate net amounts
        $net_vat_due = $total_vat_collected - $total_vat_deductible;
        $vat_credit = $net_vat_due < 0 ? abs($net_vat_due) : 0;
        $net_vat_due = $net_vat_due > 0 ? $net_vat_due : 0;

        // Update declaration totals
        $this->updateDeclarationTotals($declaration_id, $total_vat_collected, $total_vat_deductible, $net_vat_due, $vat_credit);

        return true;
    }

    /**
     * Calculate line 16: Subtotal of lines 08, 09, 9B (for user reference)
     *
     * @param int $declaration_id Declaration ID
     * @return bool Success
     */
    private function calculateLine16($declaration_id)
    {
        // Get the amounts from lines 08, 09, 9B
        $sql = "SELECT ca3_line, vat_amount FROM " . MAIN_DB_PREFIX . "declarationtva_ca3_lines 
                WHERE declaration_id = " . (int)$declaration_id . " 
                AND ca3_line IN ('08', '09', '9B')";
        
        $result = $this->db->query($sql);
        $line_16_total = 0;
        $account_labels = array();
        
        if ($result) {
            while ($obj = $this->db->fetch_object($result)) {
                $line_16_total += $obj->vat_amount;
                $account_labels[] = "Line " . $obj->ca3_line . ": " . number_format($obj->vat_amount, 2);
            }
        }
        
        // Create line 16 record
        $this->createCA3Line($declaration_id, '16', 'Subtotal: ' . implode(', ', $account_labels), array(
            'base_amount' => 0,
            'vat_amount' => $line_16_total,
            'total_amount' => $line_16_total
        ));
        
        return true;
    }

    /**
     * Round VAT amount to whole number and format with original amount in brackets
     *
     * @param float $amount Original amount
     * @return array Array with 'rounded' and 'formatted' values
     */
    private function roundVATAmount($amount)
    {
        $rounded = round($amount);
        $formatted = $rounded;
        if ($rounded != $amount) {
            $formatted = $rounded . ' (' . number_format($amount, 2) . ')';
        }
        
        return array(
            'rounded' => $rounded,
            'formatted' => $formatted
        );
    }

    /**
     * Calculate line 23: Subtotal of lines 20, 21, 22 (for user reference)
     *
     * @param int $declaration_id Declaration ID
     * @return bool Success
     */
    private function calculateLine23($declaration_id)
    {
        // Get the amounts from lines 20, 21, 22
        $sql = "SELECT ca3_line, vat_amount FROM " . MAIN_DB_PREFIX . "declarationtva_ca3_lines 
                WHERE declaration_id = " . (int)$declaration_id . " 
                AND ca3_line IN ('20', '21', '22')";
        
        $result = $this->db->query($sql);
        $line_23_total = 0;
        $account_labels = array();
        
        if ($result) {
            while ($obj = $this->db->fetch_object($result)) {
                $line_23_total += $obj->vat_amount;
                $account_labels[] = "Line " . $obj->ca3_line . ": " . number_format($obj->vat_amount, 2);
            }
        }
        
        // Create line 23 record
        $this->createCA3Line($declaration_id, '23', 'Subtotal: ' . implode(', ', $account_labels), array(
            'base_amount' => 0,
            'vat_amount' => $line_23_total,
            'total_amount' => $line_23_total
        ));
        
        return true;
    }

    /**
     * Get amount for a specific CA-3 line
     *
     * @param int $declaration_id Declaration ID
     * @param string $ca3_line CA-3 line code
     * @return float Line amount
     */
    private function getLineAmount($declaration_id, $ca3_line)
    {
        $sql = "SELECT vat_amount FROM " . MAIN_DB_PREFIX . "declarationtva_ca3_lines 
                WHERE declaration_id = " . (int)$declaration_id . " 
                AND ca3_line = '" . $this->db->escape($ca3_line) . "'";
        
        $result = $this->db->query($sql);
        if ($result && $this->db->num_rows($result) > 0) {
            $obj = $this->db->fetch_object($result);
            return (float)$obj->vat_amount;
        }
        
        return 0.0;
    }

    /**
     * Calculate D-section result lines (25, 26, 28, 29)
     *
     * @param int $declaration_id Declaration ID
     * @param float $total_vat_collected Total VAT collected
     * @param float $total_vat_deductible Total VAT deductible
     * @return bool Success
     */
    private function calculateDSectionLines($declaration_id, $total_vat_collected, $total_vat_deductible)
    {
        // Get line 16 and 23 amounts for line 25 calculation
        $line_16_amount = $this->getLineAmount($declaration_id, '16');
        $line_23_amount = $this->getLineAmount($declaration_id, '23');
        
        // Calculate net VAT due
        $net_vat_due = $total_vat_collected - $total_vat_deductible;

        // Line 25: Crédit de TVA (ligne 23 - ligne16) - only if > 0
        $line_25_amount = $line_23_amount - $line_16_amount;
        if ($line_25_amount > 0) {
            $this->createCA3Line($declaration_id, '25', 'Crédit de TVA (ligne 23 - ligne16)', array(
                'base_amount' => 0,
                'vat_amount' => $line_25_amount,
                'total_amount' => $line_25_amount
            ));
        } else {
            $this->createCA3Line($declaration_id, '25', 'Crédit de TVA (ligne 23 - ligne16)', array(
                'base_amount' => 0,
                'vat_amount' => 0,
                'total_amount' => 0
            ));
        }

        // Line 27: Crédit de TVA à reporter (ligne 25 – ligne 26) - same value as line 25, only if > 0 and < 760
        $line_27_amount = $line_25_amount; // Same value as line 25
        if ($line_27_amount > 0 && $line_27_amount < 760) {
            $this->createCA3Line($declaration_id, '27', 'Crédit de TVA à reporter (ligne 25 – ligne 26) (Cette somme est à reporter ligne 22 de la prochaine déclaration)', array(
                'base_amount' => 0,
                'vat_amount' => $line_27_amount,
                'total_amount' => $line_27_amount
            ));
        } else {
            $this->createCA3Line($declaration_id, '27', 'Crédit de TVA à reporter (ligne 25 – ligne 26) (Cette somme est à reporter ligne 22 de la prochaine déclaration)', array(
                'base_amount' => 0,
                'vat_amount' => 0,
                'total_amount' => 0
            ));
        }

        // Line 26: Remboursement de crédit de TVA demandé sur formulaire n°3519 - same value as line 25, only if >= 760
        $line_26_amount = $line_25_amount; // Same value as line 25
        if ($line_26_amount >= 760) {
            $this->createCA3Line($declaration_id, '26', 'Remboursement de crédit de TVA demandé sur formulaire n°3519', array(
                'base_amount' => 0,
                'vat_amount' => $line_26_amount,
                'total_amount' => $line_26_amount
            ));
        } else {
            $this->createCA3Line($declaration_id, '26', 'Remboursement de crédit de TVA demandé sur formulaire n°3519', array(
                'base_amount' => 0,
                'vat_amount' => 0,
                'total_amount' => 0
            ));
        }

        // Line TD: TVA due (ligne 16 – ligne 23) - only if > 0
        $line_td_amount = $line_16_amount - $line_23_amount;
        if ($line_td_amount > 0) {
            $this->createCA3Line($declaration_id, 'TD', 'TVA due (ligne 16 – ligne 23)', array(
                'base_amount' => 0,
                'vat_amount' => $line_td_amount,
                'total_amount' => $line_td_amount
            ));
        } else {
            $this->createCA3Line($declaration_id, 'TD', 'TVA due (ligne 16 – ligne 23)', array(
                'base_amount' => 0,
                'vat_amount' => 0,
                'total_amount' => 0
            ));
        }

        // Line 28: TVA nette due (ligne TD – ligne X5) - same value as line TD, only if > 0
        $line_28_amount = $line_td_amount; // Same value as line TD
        if ($line_28_amount > 0) {
            $this->createCA3Line($declaration_id, '28', 'TVA nette due (ligne TD – ligne X5)', array(
                'base_amount' => 0,
                'vat_amount' => $line_28_amount,
                'total_amount' => $line_28_amount
            ));
        } else {
            $this->createCA3Line($declaration_id, '28', 'TVA nette due (ligne TD – ligne X5)', array(
                'base_amount' => 0,
                'vat_amount' => 0,
                'total_amount' => 0
            ));
        }

        // Line 32: Total à payer (lignes 28 + 29 + Z5 – AB) - same value as line 28, only if > 0
        $line_32_amount = $line_28_amount; // Same value as line 28
        if ($line_32_amount > 0) {
            $this->createCA3Line($declaration_id, '32', 'Total à payer (lignes 28 + 29 + Z5 – AB) (N\'oubliez pas d\'effectuer le règlement correspondant)', array(
                'base_amount' => 0,
                'vat_amount' => $line_32_amount,
                'total_amount' => $line_32_amount
            ));
        } else {
            $this->createCA3Line($declaration_id, '32', 'Total à payer (lignes 28 + 29 + Z5 – AB) (N\'oubliez pas d\'effectuer le règlement correspondant)', array(
                'base_amount' => 0,
                'vat_amount' => 0,
                'total_amount' => 0
            ));
        }

        return true;
    }

    /**
     * Get account amounts for a period
     *
     * @param string $account_code Account code
     * @param string $start_date Start date
     * @param string $end_date End date
     * @return array Amounts (base_amount, vat_amount, total_amount)
     */
    public function getAccountAmounts($account_code, $start_date, $end_date)
    {
        
        // Use the correct Dolibarr accounting table structure
        $possible_queries = array(
            // Correct table and column names based on your Dolibarr structure
            "SELECT SUM(debit) as total_debit, SUM(credit) as total_credit 
             FROM " . MAIN_DB_PREFIX . "accounting_bookkeeping 
             WHERE numero_compte = '" . $this->db->escape($account_code) . "' 
             AND doc_date >= '" . $this->db->escape($start_date) . "' 
             AND doc_date <= '" . $this->db->escape($end_date) . "' 
             AND entity = " . $this->entity,
            
            // Without entity filter (in case entity is not set correctly)
            "SELECT SUM(debit) as total_debit, SUM(credit) as total_credit 
             FROM " . MAIN_DB_PREFIX . "accounting_bookkeeping 
             WHERE numero_compte = '" . $this->db->escape($account_code) . "' 
             AND doc_date >= '" . $this->db->escape($start_date) . "' 
             AND doc_date <= '" . $this->db->escape($end_date) . "'"
        );
        
        foreach ($possible_queries as $sql) {
            $result = $this->db->query($sql);
            if ($result && $this->db->num_rows($result) > 0) {
                $obj = $this->db->fetch_object($result);
                
                // For VAT accounts, we need to use the credit side (VAT collected) or debit side (VAT paid)
                // If debit = credit, the account is balanced, so we use the credit amount (VAT collected)
                if ($obj->total_debit == $obj->total_credit) {
                    // Account is balanced, use the credit amount (VAT collected)
                    $total_amount = $obj->total_credit;
                } else {
                    // Account has imbalance, use the absolute difference
                    $total_amount = abs($obj->total_debit - $obj->total_credit);
                }
                
                
                return array(
                    'base_amount' => $total_amount,
                    'vat_amount' => $total_amount,
                    'total_amount' => $total_amount
                );
            }
        }
        
        return array('base_amount' => 0, 'vat_amount' => 0, 'total_amount' => 0);
    }


    /**
     * Create CA-3 line record
     *
     * @param int $declaration_id Declaration ID
     * @param string $ca3_line CA-3 line code
     * @param string $line_label Line label
     * @param array $amounts Amounts array
     * @return bool Success
     */
    public function createCA3Line($declaration_id, $ca3_line, $line_label, $amounts)
    {
        // Get amount calculation configuration
        require_once DOL_DOCUMENT_ROOT . '/custom/declarationtva/core/class/declarationtva_config.class.php';
        $config = new DeclarationTVA_Config($this->db, $this->entity);
        $calc_config = $config->getAmountCalculationConfiguration();
        
        // Apply calculation method (round or truncate)
        if ($calc_config['amount_calculation_method'] == 'truncate') {
            $rounded_base = floor($amounts['base_amount']);
            $rounded_vat = floor($amounts['vat_amount']);
            $rounded_total = floor($amounts['total_amount']);
        } else {
            // Default to rounding
            $rounded_base = round($amounts['base_amount']);
            $rounded_vat = round($amounts['vat_amount']);
            $rounded_total = round($amounts['total_amount']);
        }
        
        // Store original amounts in the line_label for now (we'll need to modify the database schema later)
        $original_base = $amounts['base_amount'];
        $original_vat = $amounts['vat_amount'];
        $original_total = $amounts['total_amount'];
        
        $sql = "INSERT INTO " . MAIN_DB_PREFIX . "declarationtva_ca3_lines 
                (declaration_id, ca3_line, line_label, base_amount, vat_amount, total_amount, created_date) 
                VALUES (" . $declaration_id . ", '" . $this->db->escape($ca3_line) . "', 
                '" . $this->db->escape($line_label) . "', " . $rounded_base . ", 
                " . $rounded_vat . ", " . $rounded_total . ", NOW())";

        $result = $this->db->query($sql);
        
        // Store original amounts in a separate way - we'll use the line_label to store them temporarily
        if ($result && ($rounded_vat != $original_vat || $rounded_base != $original_base)) {
            $original_info = "ORIGINAL_BASE:" . $original_base . "_ORIGINAL_VAT:" . $original_vat . "_ORIGINAL_TOTAL:" . $original_total;
            $update_sql = "UPDATE " . MAIN_DB_PREFIX . "declarationtva_ca3_lines 
                          SET line_label = CONCAT(line_label, '|', '" . $this->db->escape($original_info) . "')
                          WHERE declaration_id = " . $declaration_id . " AND ca3_line = '" . $this->db->escape($ca3_line) . "'";
            $this->db->query($update_sql);
        }
        
        return $result !== false;
    }

    /**
     * Update declaration totals
     *
     * @param int $declaration_id Declaration ID
     * @param float $total_vat_collected Total VAT collected
     * @param float $total_vat_deductible Total VAT deductible
     * @param float $net_vat_due Net VAT due
     * @param float $vat_credit VAT credit
     * @return bool Success
     */
    public function updateDeclarationTotals($declaration_id, $total_vat_collected, $total_vat_deductible, $net_vat_due, $vat_credit)
    {
        // Round totals to whole numbers
        $rounded_collected = round($total_vat_collected);
        $rounded_deductible = round($total_vat_deductible);
        $rounded_net_due = round($net_vat_due);
        $rounded_credit = round($vat_credit);
        
        $sql = "UPDATE " . MAIN_DB_PREFIX . "declarationtva_declarations 
                SET total_vat_collected = " . $rounded_collected . ", 
                    total_vat_deductible = " . $rounded_deductible . ", 
                    net_vat_due = " . $rounded_net_due . ", 
                    vat_credit = " . $rounded_credit . " 
                WHERE rowid = " . $declaration_id;

        $result = $this->db->query($sql);
        return $result !== false;
    }

    /**
     * Get period information
     *
     * @param int $period_id Period ID
     * @return array|false Period information or false if not found
     */
    public function getPeriod($period_id)
    {
        $sql = "SELECT * FROM " . MAIN_DB_PREFIX . "declarationtva_periods 
                WHERE rowid = " . $period_id . " AND entity = " . $this->entity;

        $result = $this->db->query($sql);
        if ($result && $this->db->num_rows($result) > 0) {
            return $this->db->fetch_array($result);
        }

        return false;
    }

    /**
     * Generate declaration number
     *
     * @param array $period Period information
     * @return string Declaration number
     */
    public function generateDeclarationNumber($period)
    {
        $year = date('Y', strtotime($period['start_date']));
        $start_month = date('m', strtotime($period['start_date']));
        $end_month = date('m', strtotime($period['end_date']));
        
        if ($start_month == $end_month) {
            $month_part = $start_month;
        } else {
            $month_part = $start_month . '-' . $end_month;
        }
        
        return 'CA3-' . $year . '-' . $month_part . '-' . date('YmdHis');
    }

    /**
     * Generate declaration number from dates
     *
     * @param string $start_date Start date
     * @param string $end_date End date
     * @return string Declaration number
     */
    public function generateDeclarationNumberFromDates($start_date, $end_date)
    {
        $year = date('Y', strtotime($start_date));
        $start_month = date('m', strtotime($start_date));
        $end_month = date('m', strtotime($end_date));
        
        if ($start_month == $end_month) {
            $month_part = $start_month;
        } else {
            $month_part = $start_month . '-' . $end_month;
        }
        
        return 'CA3-' . $year . '-' . $month_part . '-' . date('YmdHis');
    }

    /**
     * Get declaration information
     *
     * @param int $declaration_id Declaration ID
     * @return array|false Declaration information or false if not found
     */
    public function getDeclaration($declaration_id)
    {
        $sql = "SELECT d.*, p.period_name, p.start_date, p.end_date 
                FROM " . MAIN_DB_PREFIX . "declarationtva_declarations d 
                LEFT JOIN " . MAIN_DB_PREFIX . "declarationtva_periods p ON d.period_id = p.rowid 
                WHERE d.rowid = " . $declaration_id . " AND d.entity = " . $this->entity;

        $result = $this->db->query($sql);
        if ($result && $this->db->num_rows($result) > 0) {
            return $this->db->fetch_array($result);
        }

        return false;
    }

    /**
     * Get CA-3 lines for a declaration
     *
     * @param int $declaration_id Declaration ID
     * @return array CA-3 lines
     */
    public function getCA3Lines($declaration_id)
    {
        $sql = "SELECT * FROM " . MAIN_DB_PREFIX . "declarationtva_ca3_lines 
                WHERE declaration_id = " . $declaration_id . " 
                ORDER BY ca3_line";

        $result = $this->db->query($sql);
        $lines = array();

        if ($result) {
            while ($obj = $this->db->fetch_object($result)) {
                $lines[] = array(
                    'ca3_line' => $obj->ca3_line,
                    'line_label' => $obj->line_label,
                    'base_amount' => $obj->base_amount,
                    'vat_amount' => $obj->vat_amount,
                    'total_amount' => $obj->total_amount
                );
            }
        }

        return $lines;
    }


    /**
     * Submit declaration
     *
     * @param int $declaration_id Declaration ID
     * @return bool Success
     */
    public function submitDeclaration($declaration_id)
    {
        $sql = "UPDATE " . MAIN_DB_PREFIX . "declarationtva_declarations 
                SET status = 'submitted', submission_date = NOW() 
                WHERE rowid = " . $declaration_id . " AND entity = " . $this->entity;

        $result = $this->db->query($sql);
        return $result !== false;
    }

    /**
     * Delete a declaration
     *
     * @param int $declaration_id Declaration ID
     * @return bool Success
     */
    public function deleteDeclaration($declaration_id)
    {
        $this->db->begin();

        // Check if declaration exists and is in draft status
        $sql = "SELECT status FROM " . MAIN_DB_PREFIX . "declarationtva_declarations 
                WHERE rowid = " . (int)$declaration_id . " AND entity = " . $this->entity;
        
        $result = $this->db->query($sql);
        if ($result) {
            $obj = $this->db->fetch_object($result);
            if ($obj && $obj->status == 'draft') {
                // Delete CA-3 lines first
                $sql_lines = "DELETE FROM " . MAIN_DB_PREFIX . "declarationtva_ca3_lines 
                              WHERE declaration_id = " . (int)$declaration_id;
                $this->db->query($sql_lines);

                // Delete declaration
                $sql_declaration = "DELETE FROM " . MAIN_DB_PREFIX . "declarationtva_declarations 
                                   WHERE rowid = " . (int)$declaration_id . " AND entity = " . $this->entity;
                
                $result = $this->db->query($sql_declaration);
                if ($result) {
                    $this->db->commit();
                    return true;
                }
            }
        }

        $this->db->rollback();
        return false;
    }


    /**
     * Recalculate CA-3 amounts for a declaration
     *
     * @param int $declaration_id Declaration ID
     * @return bool Success
     */
    public function recalculateCA3Amounts($declaration_id)
    {
        // Get declaration info directly from database
        $sql = "SELECT start_date, end_date FROM " . MAIN_DB_PREFIX . "declarationtva_declarations 
                WHERE rowid = " . $declaration_id . " AND entity = " . $this->entity;
        
        $result = $this->db->query($sql);
        if (!$result || $this->db->num_rows($result) == 0) {
            return false;
        }
        
        $obj = $this->db->fetch_object($result);
        
        // Clear existing CA-3 lines
        $sql = "DELETE FROM " . MAIN_DB_PREFIX . "declarationtva_ca3_lines 
                WHERE declaration_id = " . $declaration_id;
        $this->db->query($sql);
        
        // Recalculate using declaration dates
        $period = array(
            'start_date' => $obj->start_date,
            'end_date' => $obj->end_date
        );
        
        return $this->calculateCA3Amounts($declaration_id, $period);
    }

    /**
     * Get account mappings with labels from chart of accounts
     *
     * @return array Array of account mappings with labels
     */
    public function getAccountMappings()
    {
        $sql = "SELECT m.rowid, m.ca3_line, m.account_code, m.account_label, m.vat_rate, m.is_active,
                       a.label as account_label_pcg
                FROM " . MAIN_DB_PREFIX . "declarationtva_account_mappings m
                LEFT JOIN " . MAIN_DB_PREFIX . "accounting_account a ON a.account_number = m.account_code AND a.entity = m.entity
                WHERE m.entity = " . $this->entity . " AND m.is_active = 1
                ORDER BY m.ca3_line, m.account_code";
        
        $result = $this->db->query($sql);
        $mappings = array();
        
        if ($result) {
            while ($obj = $this->db->fetch_object($result)) {
                // Use the label from chart of accounts if available, otherwise use the stored label
                $account_label = !empty($obj->account_label_pcg) ? $obj->account_label_pcg : $obj->account_label;
                
                $mappings[] = array(
                    'rowid' => $obj->rowid,
                    'ca3_line' => $obj->ca3_line,
                    'account_code' => $obj->account_code,
                    'account_label' => $account_label,
                    'vat_rate' => $obj->vat_rate,
                    'is_active' => $obj->is_active
                );
            }
        }
        
        return $mappings;
    }

    /**
     * Get detailed account breakdown for a specific CA-3 line
     *
     * @param int $declaration_id Declaration ID
     * @param string $ca3_line CA-3 line code (e.g., 'A1', '08', '09', etc.)
     * @return array Detailed breakdown with accounts and amounts
     */
    public function getCA3LineDetails($declaration_id, $ca3_line)
    {
        // Get declaration dates
        $sql = "SELECT start_date, end_date FROM " . MAIN_DB_PREFIX . "declarationtva_declarations 
                WHERE rowid = " . (int)$declaration_id . " AND entity = " . $this->entity;
        
        $result = $this->db->query($sql);
        if (!$result || $this->db->num_rows($result) == 0) {
            return array();
        }
        
        $obj = $this->db->fetch_object($result);
        $start_date = $obj->start_date;
        $end_date = $obj->end_date;
        
        // Get account mappings for this CA-3 line
        $mappings = $this->getAccountMappings();
        $line_mappings = array();
        
        // Find mappings for this specific line
        foreach ($mappings as $mapping) {
            // Handle special cases for lines 08, 09, 9B which have _BASE and _VAT suffixes
            if (in_array($ca3_line, array('08', '09', '9B'))) {
                if ($mapping['ca3_line'] == $ca3_line . '_BASE' || $mapping['ca3_line'] == $ca3_line . '_VAT') {
                    $line_mappings[] = $mapping;
                }
            } else {
                // Normal matching for other lines
                if ($mapping['ca3_line'] == $ca3_line) {
                    $line_mappings[] = $mapping;
                }
            }
        }
        
        $details = array();
        $total_base = 0;
        $total_vat = 0;
        $total_amount = 0;
        
        // Process each mapped account
        foreach ($line_mappings as $mapping) {
            $account_code = $mapping['account_code'];
            $account_label = $mapping['account_label'];
            
            // Get account amounts for this period
            $amounts = $this->getAccountAmounts($account_code, $start_date, $end_date);
            
            $account_detail = array(
                'account_code' => $account_code,
                'account_label' => $account_label,
                'base_amount' => $amounts['base_amount'],
                'vat_amount' => $amounts['vat_amount'],
                'total_amount' => $amounts['total_amount'],
                'mapping_type' => $mapping['ca3_line'] // Will be 'A1', '08_BASE', '08_VAT', etc.
            );
            
            $details[] = $account_detail;
            
            // Accumulate totals
            $total_base += $amounts['base_amount'];
            $total_vat += $amounts['vat_amount'];
            $total_amount += $amounts['total_amount'];
        }
        
        // Get the calculated line total from CA-3 lines table
        $sql_line = "SELECT base_amount, vat_amount, total_amount, line_label 
                     FROM " . MAIN_DB_PREFIX . "declarationtva_ca3_lines 
                     WHERE declaration_id = " . (int)$declaration_id . " 
                     AND ca3_line = '" . $this->db->escape($ca3_line) . "'";
        
        $result_line = $this->db->query($sql_line);
        $calculated_line = null;
        if ($result_line && $this->db->num_rows($result_line) > 0) {
            $calculated_line = $this->db->fetch_object($result_line);
        }
        
        return array(
            'ca3_line' => $ca3_line,
            'declaration_id' => $declaration_id,
            'start_date' => $start_date,
            'end_date' => $end_date,
            'account_details' => $details,
            'calculated_line' => $calculated_line,
            'totals' => array(
                'base_amount' => $total_base,
                'vat_amount' => $total_vat,
                'total_amount' => $total_amount
            ),
            'account_count' => count($details)
        );
    }
    
    /**
     * Validate a declaration
     *
     * @param int $declaration_id Declaration ID
     * @return bool Success
     */
    public function validateDeclaration($declaration_id)
    {
        // First, check if the validated_date and validated_by columns exist
        $sql_check_columns = "SHOW COLUMNS FROM " . MAIN_DB_PREFIX . "declarationtva_declarations LIKE 'validated_date'";
        $result_check = $this->db->query($sql_check_columns);
        $has_validated_columns = ($result_check && $this->db->num_rows($result_check) > 0);
        
        if ($has_validated_columns) {
            // Use the enhanced version with validated_date and validated_by
            $sql = "UPDATE " . MAIN_DB_PREFIX . "declarationtva_declarations 
                    SET status = 'validated', 
                        validated_date = NOW(),
                        validated_by = " . $this->db->escape($GLOBALS['user']->id) . "
                    WHERE rowid = " . (int)$declaration_id . " 
                    AND entity = " . $this->entity;
        } else {
            // Use the basic version without the additional columns
            $sql = "UPDATE " . MAIN_DB_PREFIX . "declarationtva_declarations 
                    SET status = 'validated'
                    WHERE rowid = " . (int)$declaration_id . " 
                    AND entity = " . $this->entity;
        }
        
        $result = $this->db->query($sql);
        if (!$result) {
            $this->error = "Database error updating declaration: " . $this->db->lasterror();
            return false;
        }
        
        // Check if the update actually affected any rows
        if ($this->db->affected_rows($result) == 0) {
            $this->error = "No declaration found with ID " . $declaration_id . " or insufficient permissions";
            return false;
        }
        
        return true;
    }
    
    /**
     * Unvalidate a declaration (for testing purposes)
     *
     * @param int $declaration_id Declaration ID
     * @return bool Success
     */
    public function unvalidateDeclaration($declaration_id)
    {
        // Check if the validated_date and validated_by columns exist
        $sql_check_columns = "SHOW COLUMNS FROM " . MAIN_DB_PREFIX . "declarationtva_declarations LIKE 'validated_date'";
        $result_check = $this->db->query($sql_check_columns);
        $has_validated_columns = ($result_check && $this->db->num_rows($result_check) > 0);
        
        if ($has_validated_columns) {
            // Use the enhanced version with validated_date and validated_by
            $sql = "UPDATE " . MAIN_DB_PREFIX . "declarationtva_declarations 
                    SET status = 'draft', 
                        validated_date = NULL,
                        validated_by = NULL
                    WHERE rowid = " . (int)$declaration_id . " 
                    AND entity = " . $this->entity;
        } else {
            // Use the basic version without the additional columns
            $sql = "UPDATE " . MAIN_DB_PREFIX . "declarationtva_declarations 
                    SET status = 'draft'
                    WHERE rowid = " . (int)$declaration_id . " 
                    AND entity = " . $this->entity;
        }
        
        $result = $this->db->query($sql);
        if (!$result) {
            $this->error = "Database error updating declaration: " . $this->db->lasterror();
            return false;
        }
        
        // Check if the update actually affected any rows
        if ($this->db->affected_rows($result) == 0) {
            $this->error = "No declaration found with ID " . $declaration_id . " or insufficient permissions";
            return false;
        }
        
        return true;
    }
    
    /**
     * Save validated PDF to Dolibarr documents
     *
     * @param int $declaration_id Declaration ID
     * @param string $pdf_path Path to the PDF file
     * @return bool Success
     */
    public function saveValidatedPDF($declaration_id, $pdf_path)
    {
        global $conf, $user;
        
        try {
            // Create VAT declarations validated directory structure
            $vat_declarations_dir = DOL_DATA_ROOT . '/declarationtva/validated/';
            
            // Create directory if it doesn't exist
            if (!is_dir($vat_declarations_dir)) {
                if (!dol_mkdir($vat_declarations_dir)) {
                    $this->error = "Failed to create VAT declarations directory: " . $vat_declarations_dir;
                    return false;
                }
            }
            
            // Check if PDF is already in the correct location
            if (strpos($pdf_path, $vat_declarations_dir) === 0) {
                // PDF is already in the correct location, no need to copy
                $dest_path = $pdf_path;
            } else {
                // Generate filename with proper structure
                $filename = 'CA3_' . $this->declaration_number . '_' . date('Y-m-d') . '.pdf';
                $dest_path = $vat_declarations_dir . $filename;
                
                // Copy PDF to validated directory
                if (!copy($pdf_path, $dest_path)) {
                    $this->error = "Failed to copy PDF to validated directory";
                    return false;
                }
            }
            
            // Try to add document record to Dolibarr (optional feature)
            // Skip ECM integration if there are any issues to prevent fatal errors
            $ecm_integration_enabled = false; // Temporarily disabled to prevent fatal errors
            
            if ($ecm_integration_enabled) {
                // Try multiple possible paths for ecmfiles.class.php
                $ecmfiles_paths = array(
                    DOL_DOCUMENT_ROOT . '/ecm/class/ecmfiles.class.php',
                    dirname(__FILE__) . '/../../../ecm/class/ecmfiles.class.php',
                    dirname(__FILE__) . '/../../../../ecm/class/ecmfiles.class.php',
                    DOL_DOCUMENT_ROOT . '/core/class/ecmfiles.class.php',
                    dirname(__FILE__) . '/../../../../core/class/ecmfiles.class.php'
                );
                
                $ecmfiles_path = null;
                foreach ($ecmfiles_paths as $path) {
                    if (file_exists($path)) {
                        $ecmfiles_path = $path;
                        break;
                    }
                }
                
                if ($ecmfiles_path && file_exists($ecmfiles_path)) {
                try {
                    // Log the path being used for debugging
                    error_log("DeclarationTVA: Using ECM files path: " . $ecmfiles_path);
                    require_once $ecmfiles_path;
                    $ecmfile = new EcmFiles($this->db);
                    
                    $ecmfile->filepath = 'declarationtva/' . date('Y') . '/' . date('m') . '/';
                    $ecmfile->filename = $filename;
                    $ecmfile->label = 'CA-3 Déclaration TVA - ' . $this->declaration_number;
                    $ecmfile->description = 'Déclaration TVA CA-3 validée avec détail des comptes pour la période ' . date('Y-m');
                    $ecmfile->entity = $this->entity;
                    $ecmfile->fk_user_author = $user->id;
                    $ecmfile->fk_user_modif = $user->id;
                    $ecmfile->datec = dol_now();
                    $ecmfile->tms = dol_now();
                    $ecmfile->mimetype = 'application/pdf';
                    $ecmfile->filesize = filesize($dest_path);
                    $ecmfile->checksum = md5_file($dest_path);
                    
                    $result = $ecmfile->create($user);
                    if ($result > 0) {
                        // Try to link document to declaration (this might fail if table doesn't exist)
                        $link_result = $this->linkDocumentToDeclaration($declaration_id, $ecmfile->id);
                        if (!$link_result) {
                            // Log the error but don't fail the whole process
                            error_log("DeclarationTVA: Failed to link document to declaration: " . $this->error);
                        }
                    } else {
                        // Log the error but don't fail the whole process
                        error_log("DeclarationTVA: Failed to create ECM file record: " . $ecmfile->error);
                    }
                } catch (Exception $e) {
                    // Log the error but don't fail the whole process
                    error_log("DeclarationTVA: Exception creating ECM file: " . $e->getMessage());
                }
                } else {
                    // Log that ECM files class is not available
                    error_log("DeclarationTVA: ECM files class not found. Tried paths: " . implode(', ', $ecmfiles_paths));
                }
            }
            
            // Return true even if ECM file creation failed - the PDF is still saved to disk
            return true;
        } catch (Exception $e) {
            $this->error = "Exception in saveValidatedPDF: " . $e->getMessage();
            return false;
        }
    }
    
    /**
     * Link document to declaration
     *
     * @param int $declaration_id Declaration ID
     * @param int $document_id Document ID
     * @return bool Success
     */
    private function linkDocumentToDeclaration($declaration_id, $document_id)
    {
        // First check if the table exists
        $sql_check = "SHOW TABLES LIKE '" . MAIN_DB_PREFIX . "declarationtva_documents'";
        $result_check = $this->db->query($sql_check);
        
        if (!$result_check || $this->db->num_rows($result_check) == 0) {
            $this->error = "Documents table does not exist. Please run the database migration.";
            return false;
        }
        
        $sql = "INSERT INTO " . MAIN_DB_PREFIX . "declarationtva_documents 
                (declaration_id, document_id, created_date, entity) 
                VALUES (" . (int)$declaration_id . ", " . (int)$document_id . ", NOW(), " . $this->entity . ")";
        
        $result = $this->db->query($sql);
        if (!$result) {
            $this->error = "Database error linking document: " . $this->db->lasterror();
            return false;
        }
        
        return true;
    }
    
    /**
     * Check if declaration has a validated document
     *
     * @param int $declaration_id Declaration ID
     * @return bool Has document
     */
    public function hasValidatedDocument($declaration_id)
    {
        // Get declaration details
        $sql = "SELECT declaration_number, status FROM " . MAIN_DB_PREFIX . "declarationtva_declarations 
                WHERE rowid = " . (int)$declaration_id . " AND entity = " . $this->entity;
        
        $result = $this->db->query($sql);
        if (!$result || $this->db->num_rows($result) == 0) {
            return false;
        }
        
        $obj = $this->db->fetch_object($result);
        
        // Only check for documents if declaration is validated
        if ($obj->status != 'validated') {
            return false;
        }
        
        // Check if PDF file exists in the VAT declarations validated directory
        $vat_declarations_dir = DOL_DATA_ROOT . '/declarationtva/validated/';
        
        // Debug: Log the search
        error_log("hasValidatedDocument: Searching in " . $vat_declarations_dir . " for declaration " . $obj->declaration_number);
        
        // Look for PDF files with the declaration number
        $pattern = $vat_declarations_dir . 'CA3_' . $obj->declaration_number . '_*.pdf';
        $files = glob($pattern);
        
        // Debug: Log the pattern and results
        error_log("hasValidatedDocument: Pattern: " . $pattern);
        error_log("hasValidatedDocument: Files found: " . print_r($files, true));
        
        // If no files found with the exact pattern, try a more flexible search
        if (empty($files)) {
            $pattern = $vat_declarations_dir . 'CA3_*' . $obj->declaration_number . '*.pdf';
            $files = glob($pattern);
            error_log("hasValidatedDocument: Flexible pattern: " . $pattern);
            error_log("hasValidatedDocument: Flexible files found: " . print_r($files, true));
        }
        
        $result = !empty($files) && file_exists($files[0]);
        error_log("hasValidatedDocument: Final result: " . ($result ? 'true' : 'false'));
        return $result;
    }
    
    /**
     * Get the PDF file path for a validated declaration
     *
     * @param int $declaration_id Declaration ID
     * @return string|false PDF file path or false if not found
     */
    public function getValidatedPDFPath($declaration_id)
    {
        // Get declaration details
        $sql = "SELECT declaration_number, status FROM " . MAIN_DB_PREFIX . "declarationtva_declarations 
                WHERE rowid = " . (int)$declaration_id . " AND entity = " . $this->entity;
        
        $result = $this->db->query($sql);
        if (!$result || $this->db->num_rows($result) == 0) {
            return false;
        }
        
        $obj = $this->db->fetch_object($result);
        
        // Only return path if declaration is validated
        if ($obj->status != 'validated') {
            return false;
        }
        
        // Check if PDF file exists in the VAT declarations validated directory
        $vat_declarations_dir = DOL_DATA_ROOT . '/declarationtva/validated/';
        
        // Look for PDF files with the declaration number
        $pattern = $vat_declarations_dir . 'CA3_' . $obj->declaration_number . '_*.pdf';
        $files = glob($pattern);
        
        // If no files found with the exact pattern, try a more flexible search
        if (empty($files)) {
            $pattern = $vat_declarations_dir . 'CA3_*' . $obj->declaration_number . '*.pdf';
            $files = glob($pattern);
        }
        
        if (!empty($files) && file_exists($files[0])) {
            return $files[0];
        }
        
        return false;
    }
    
    /**
     * Get the VAT declarations documents directory path
     *
     * @param string $year Year (optional, defaults to current year)
     * @param string $month Month (optional, defaults to current month)
     * @return string Directory path
     */
    public function getVATDeclarationsDirectory($year = null, $month = null)
    {
        if ($year === null) {
            $year = date('Y');
        }
        if ($month === null) {
            $month = date('m');
        }
        
        return DOL_DATA_ROOT . '/documents/declarationtva/' . $year . '/' . $month . '/';
    }
    
    /**
     * Get the relative path for ECM files
     *
     * @param string $year Year (optional, defaults to current year)
     * @param string $month Month (optional, defaults to current month)
     * @return string Relative path
     */
    public function getVATDeclarationsRelativePath($year = null, $month = null)
    {
        if ($year === null) {
            $year = date('Y');
        }
        if ($month === null) {
            $month = date('m');
        }
        
        return 'declarationtva/' . $year . '/' . $month . '/';
    }
}