<?php
/**
 * DeclarationTVA_Config Class
 * Configuration management for DeclarationTVA module
 * MVP Version - Phase 1
 */

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

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

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

    /**
     * Constructor
     *
     * @param DoliDB $db Database handler
     * @param int $entity Entity ID
     */
    public function __construct($db, $entity = 1)
    {
        $this->db = $db;
        $this->entity = $entity;
        
        // Ensure the config table exists
        $this->ensureConfigTableExists();
    }
    
    /**
     * Ensure the declarationtva_config table exists
     *
     * @return bool Success
     */
    private function ensureConfigTableExists()
    {
        // Check if table exists
        $sql = "SHOW TABLES LIKE '" . MAIN_DB_PREFIX . "declarationtva_config'";
        $result = $this->db->query($sql);
        
        if (!$result || $this->db->num_rows($result) == 0) {
            // Table doesn't exist, create it
            $create_sql = "CREATE TABLE IF NOT EXISTS `" . MAIN_DB_PREFIX . "declarationtva_config` (
                `rowid` int(11) NOT NULL AUTO_INCREMENT,
                `entity` int(11) NOT NULL DEFAULT 1,
                `config_key` varchar(64) NOT NULL,
                `config_value` text,
                `created_date` datetime DEFAULT NULL,
                PRIMARY KEY (`rowid`),
                UNIQUE KEY `uk_config_entity_key` (`entity`, `config_key`)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci";
            
            $create_result = $this->db->query($create_sql);
            if (!$create_result) {
                return false;
            }
            
            // Insert default configuration values
            $this->insertDefaultConfigValues();
            
        }
        
        return true;
    }
    
    /**
     * Insert default configuration values
     *
     * @return bool Success
     */
    private function insertDefaultConfigValues()
    {
        $default_configs = array(
            'module_version' => '2.4.0',
            'amount_calc_amount_calculation_method' => 'truncate',
            'auto_create_auto_create_accounting' => '0',
            'bank_bank_account' => '0',
            'journal_vat_to_pay' => '44551',
            'journal_vat_to_receive' => '44567',
            'journal_other_charges' => '658',
            'journal_other_products' => '758'
        );
        
        foreach ($default_configs as $key => $value) {
            $sql = "INSERT IGNORE INTO " . MAIN_DB_PREFIX . "declarationtva_config 
                    (entity, config_key, config_value, created_date) 
                    VALUES (" . $this->entity . ", '" . $this->db->escape($key) . "', 
                    '" . $this->db->escape($value) . "', NOW())";
            $this->db->query($sql);
        }
        
        return true;
    }

    /**
     * Get configuration value
     *
     * @param string $key Configuration key
     * @param mixed $default Default value
     * @return mixed Configuration value
     */
    public function get($key, $default = null)
    {
        $sql = "SELECT config_value FROM " . MAIN_DB_PREFIX . "declarationtva_config 
                WHERE entity = " . $this->entity . " AND config_key = '" . $this->db->escape($key) . "'";

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

        return $default;
    }

    /**
     * Set configuration value
     *
     * @param string $key Configuration key
     * @param mixed $value Configuration value
     * @return bool Success
     */
    public function set($key, $value)
    {
        $sql = "INSERT INTO " . MAIN_DB_PREFIX . "declarationtva_config 
                (entity, config_key, config_value, created_date) 
                VALUES (" . $this->entity . ", '" . $this->db->escape($key) . "', 
                '" . $this->db->escape($value) . "', NOW()) 
                ON DUPLICATE KEY UPDATE config_value = '" . $this->db->escape($value) . "'";

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

    /**
     * Get account mapping for a CA-3 line
     *
     * @param string $ca3_line CA-3 line code
     * @return array|false Account mapping or false if not found
     */
    public function getAccountMapping($ca3_line)
    {
        $sql = "SELECT * FROM " . MAIN_DB_PREFIX . "declarationtva_account_mappings 
                WHERE entity = " . $this->entity . " AND ca3_line = '" . $this->db->escape($ca3_line) . "'";

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

        return false;
    }

    /**
     * Update account mapping for multiple accounts
     *
     * @param string $ca3_line CA-3 line code
     * @param array $account_codes Array of account codes
     * @return bool Success
     */
    public function updateAccountMapping($ca3_line, $account_codes)
    {
        // First, deactivate all existing mappings for this CA-3 line
        $sql = "UPDATE " . MAIN_DB_PREFIX . "declarationtva_account_mappings 
                SET is_active = 0 
                WHERE entity = " . $this->entity . " AND ca3_line = '" . $this->db->escape($ca3_line) . "'";
        $this->db->query($sql);
        
        // Then insert/activate new mappings (only if account_codes is not empty)
        if (!empty($account_codes) && is_array($account_codes)) {
            foreach ($account_codes as $account_code) {
                if (!empty($account_code)) {
                    // Check if mapping already exists (active or inactive)
                    $check_sql = "SELECT rowid, is_active FROM " . MAIN_DB_PREFIX . "declarationtva_account_mappings 
                                 WHERE entity = " . $this->entity . " 
                                 AND ca3_line = '" . $this->db->escape($ca3_line) . "' 
                                 AND account_code = '" . $this->db->escape($account_code) . "'";
                    $check_result = $this->db->query($check_sql);
                    
                    if ($check_result && $this->db->num_rows($check_result) > 0) {
                        // Update existing mapping (reactivate it)
                        $sql = "UPDATE " . MAIN_DB_PREFIX . "declarationtva_account_mappings 
                                SET is_active = 1 
                                WHERE entity = " . $this->entity . " 
                                AND ca3_line = '" . $this->db->escape($ca3_line) . "' 
                                AND account_code = '" . $this->db->escape($account_code) . "'";
                        $this->db->query($sql);
                    } else {
                        // Insert new mapping
                        $sql = "INSERT INTO " . MAIN_DB_PREFIX . "declarationtva_account_mappings 
                                (entity, ca3_line, account_code, account_label, vat_rate, is_active, created_date) 
                                VALUES (" . $this->entity . ", '" . $this->db->escape($ca3_line) . "', 
                                '" . $this->db->escape($account_code) . "', '', 0, 1, NOW())";
                        $this->db->query($sql);
                    }
                }
            }
        }
        // If account_codes is empty, all mappings for this line remain deactivated
        // This ensures that clearing all selections properly saves the empty state
        
        return true;
    }

    /**
     * Get all account mappings
     *
     * @return array Account mappings
     */
    public function getAllAccountMappings()
    {
        $sql = "SELECT * FROM " . MAIN_DB_PREFIX . "declarationtva_account_mappings 
                WHERE entity = " . $this->entity . " AND is_active = 1 
                ORDER BY ca3_line";

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

        if ($result) {
            while ($obj = $this->db->fetch_object($result)) {
                $mappings[] = array(
                    'rowid' => $obj->rowid,
                    'ca3_line' => $obj->ca3_line,
                    'account_code' => $obj->account_code,
                    'account_label' => $obj->account_label,
                    'vat_rate' => $obj->vat_rate,
                    'is_active' => $obj->is_active
                );
            }
        }

        return $mappings;
    }

    /**
     * Get account mappings grouped by CA-3 line
     *
     * @return array Account mappings grouped by CA-3 line
     */
    public function getAccountMappingsByLine()
    {
        $sql = "SELECT ca3_line, account_code FROM " . MAIN_DB_PREFIX . "declarationtva_account_mappings 
                WHERE entity = " . $this->entity . " AND is_active = 1 
                ORDER BY ca3_line, account_code";

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

        if ($result) {
            while ($obj = $this->db->fetch_object($result)) {
                if (!isset($mappings[$obj->ca3_line])) {
                    $mappings[$obj->ca3_line] = array();
                }
                $mappings[$obj->ca3_line][] = $obj->account_code;
            }
        }

        return $mappings;
    }

    /**
     * Get available accounting accounts from Dolibarr
     *
     * @return array Accounting accounts
     */
    public function getAccountingAccounts()
    {
        // Use the same approach as in the view page - check how it's done there
        // Order by rowid DESC to get the most recent account for each account number
        $sql = "SELECT a.account_number, a.label 
                FROM " . MAIN_DB_PREFIX . "accounting_account a 
                WHERE a.entity = " . $this->entity . " 
                ORDER BY a.account_number, a.rowid DESC";

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

        if ($result) {
            while ($obj = $this->db->fetch_object($result)) {
                $accounts[] = array(
                    'account_number' => $obj->account_number,
                    'label' => $obj->label
                );
            }
        }


        return $accounts;
    }

    /**
     * Get auto-create accounting configuration
     *
     * @return array Auto-create accounting configuration
     */
    public function getAutoCreateAccountingConfiguration()
    {
        $default_config = array(
            'auto_create_accounting' => 0  // Disabled by default
        );
        
        $config = array();
        foreach ($default_config as $key => $default_value) {
            $config[$key] = $this->get('auto_create_' . $key, $default_value);
        }
        
        return $config;
    }
    
    /**
     * Get amount calculation configuration
     *
     * @return array Amount calculation configuration
     */
    public function getAmountCalculationConfiguration()
    {
        $default_config = array(
            'amount_calculation_method' => 'truncate'  // 'round' or 'truncate'
        );
        
        $config = array();
        foreach ($default_config as $key => $default_value) {
            $config[$key] = $this->get('amount_calc_' . $key, $default_value);
        }
        
        return $config;
    }
    
    /**
     * Update amount calculation configuration
     *
     * @param string $method Calculation method ('round' or 'truncate')
     * @return bool Success
     */
    public function updateAmountCalculationConfiguration($method)
    {
        if (!in_array($method, array('round', 'truncate'))) {
            return false;
        }
        
        return $this->set('amount_calc_amount_calculation_method', $method);
    }
    
    /**
     * Update auto-create accounting configuration
     *
     * @param int $auto_create_accounting Auto-create accounting flag (0 or 1)
     * @return bool Success
     */
    public function updateAutoCreateAccountingConfiguration($auto_create_accounting)
    {
        return $this->set('auto_create_auto_create_accounting', (int)$auto_create_accounting);
    }
    
    /**
     * Get bank account configuration
     *
     * @return array Bank account configuration
     */
    public function getBankAccountConfiguration()
    {
        $default_config = array(
            'bank_account' => 0  // No bank account selected by default
        );
        
        $config = array();
        foreach ($default_config as $key => $default_value) {
            $value = $this->get('bank_' . $key, $default_value);
            $config[$key] = $value;
        }
        
        return $config;
    }
    
    /**
     * Update bank account configuration
     *
     * @param int $bank_account_id Bank account ID
     * @return bool Success
     */
    public function updateBankAccountConfiguration($bank_account_id)
    {
        $result = $this->set('bank_bank_account', (int)$bank_account_id);
        return $result;
    }
    
    /**
     * Get available bank accounts
     *
     * @return array Bank accounts
     */
    public function getBankAccounts()
    {
        $sql = "SELECT rowid, label, number, bank 
                FROM " . MAIN_DB_PREFIX . "bank_account 
                WHERE entity = " . $this->entity . " 
                AND clos = 0 
                ORDER BY label";
        
        $result = $this->db->query($sql);
        $accounts = array();
        
        if ($result) {
            while ($obj = $this->db->fetch_object($result)) {
                $accounts[] = array(
                    'rowid' => $obj->rowid,
                    'label' => $obj->label,
                    'number' => $obj->number,
                    'bank' => $obj->bank
                );
            }
        }
        
        return $accounts;
    }
    
    /**
     * Get CA-3 line definitions (Notice 4722 - Latest Official Structure)
     *
     * @return array CA-3 line definitions
     */
    public function getCA3LineDefinitions()
    {
        return array(
            // A. Opérations imposables (Taxable Operations) - Notice 4722
            'A1' => array(
                'label' => 'Ventes, prestations de services',
                'type' => 'base',
                'section' => 'A',
                'description' => 'Ventes, prestations de services',
                'pcg_accounts' => 'Sales: 7xxxx; VAT: 44571x / 44572x / 44573x / 44574x'
            ),
            'A2' => array(
                'label' => 'Autres opérations imposables',
                'type' => 'base',
                'section' => 'A',
                'description' => 'Autres opérations imposables',
                'pcg_accounts' => '775xxx (gains on disposal), 72xxx (production immobilisée), VAT: 44571x'
            ),
            'A3' => array(
                'label' => 'Achats de prestations de services réalisés auprès d\'un assujetti non établi en France (article 283-2 du code général des impôts)',
                'type' => 'base',
                'section' => 'A',
                'description' => 'Achats de prestations de services réalisés auprès d\'un assujetti non établi en France (article 283-2 du code général des impôts)',
                'pcg_accounts' => '6xxxx (services purchased), 4452xxx (TVA due autoliquidée)'
            ),
            'A4' => array(
                'label' => 'Importations (autres que les produits pétroliers)',
                'type' => 'base',
                'section' => 'A',
                'description' => 'Importations (autres que les produits pétroliers)',
                'pcg_accounts' => '6xxxx / 2xxxx purchases or assets; VAT: 4452xxx (import VAT)'
            ),
            'A5' => array(
                'label' => 'Sorties de régime fiscal suspensif (autres que les produits pétroliers) et sorties de régime particulier douanier uniquement lorsque des livraisons ont eu lieu en cours de régime',
                'type' => 'base',
                'section' => 'A',
                'description' => 'Sorties de régime fiscal suspensif (autres que les produits pétroliers) et sorties de régime particulier douanier uniquement lorsque des livraisons ont eu lieu en cours de régime',
                'pcg_accounts' => 'Specific 6xxxx/2xxxx depending on goods; VAT: 4452xxx'
            ),
            
            // B. Décompte de la TVA due (VAT Due Calculation) - Notice 4722
            '08' => array(
                'label' => 'TVA due au taux de 20% (Base HT + TVA)',
                'type' => 'base_vat',
                'section' => 'B',
                'description' => 'Base HT and VAT amounts due at 20% rate',
                'pcg_accounts' => 'Base: 7xxxx (Sales); VAT: 44571x (TVA collectée à 20%)'
            ),
            '09' => array(
                'label' => 'TVA due au taux de 10% (Base HT + TVA)',
                'type' => 'base_vat',
                'section' => 'B',
                'description' => 'Base HT and VAT amounts due at 10% rate',
                'pcg_accounts' => 'Base: 7xxxx (Sales); VAT: 44572x (TVA collectée à 10%)'
            ),
            '9B' => array(
                'label' => 'TVA due aux taux réduits (Base HT + TVA)',
                'type' => 'base_vat',
                'section' => 'B',
                'description' => 'Base HT and VAT amounts due at reduced rates (5,5% and 2,1%)',
                'pcg_accounts' => 'Base: 7xxxx (Sales); VAT: 44573x (5,5%) / 44574x (2,1%)'
            ),
            '17' => array(
                'label' => 'TVA due au titre des acquisitions intracommunautaires (autoliquidation)',
                'type' => 'vat',
                'section' => 'B',
                'description' => 'VAT due on intra-EU acquisitions (autoliquidation)',
                'pcg_accounts' => '4452xxx (TVA due intracommunautaire)'
            ),
            '18' => array(
                'label' => 'Dont TVA sur opérations à destination de Monaco',
                'type' => 'vat',
                'section' => 'B',
                'description' => 'VAT on operations to Monaco',
                'pcg_accounts' => '4452xxx (TVA due Monaco)'
            ),
            '19' => array(
                'label' => 'Biens constituant des immobilisations',
                'type' => 'vat',
                'section' => 'B',
                'description' => 'Goods constituting fixed assets',
                'pcg_accounts' => '44562x (TVA déductible immobilisations)'
            ),
            '20' => array(
                'label' => 'Autres biens et services',
                'type' => 'vat',
                'section' => 'B',
                'description' => 'Other goods and services',
                'pcg_accounts' => '44566x (TVA déductible autres)'
            ),
            
            // Additional deductible VAT lines
            '21' => array(
                'label' => 'Autre TVA à déduire',
                'type' => 'vat',
                'section' => 'B',
                'description' => 'Other deductible VAT',
                'pcg_accounts' => '44566x (Autre TVA à déduire)'
            ),
            '22' => array(
                'label' => 'Report du crédit apparaissant ligne 27 de la précédente déclaration',
                'type' => 'vat',
                'section' => 'B',
                'description' => 'Carry forward of credit appearing on line 27 of the previous declaration',
                'pcg_accounts' => '44567x (Report crédit TVA)'
            ),
            
            // E. Export and Non-Taxable Operations (part of Section A) - Notice 4722
            'E1' => array(
                'label' => 'Exportations hors UE',
                'type' => 'base',
                'section' => 'A',
                'description' => 'Exportations hors UE',
                'pcg_accounts' => '7xxxx (exports), 4458xxx (TVA export)'
            ),
            'E2' => array(
                'label' => 'Autres opérations non imposables',
                'type' => 'base',
                'section' => 'A',
                'description' => 'Autres opérations non imposables',
                'pcg_accounts' => '7xxxx (exempt sales), 4458xxx (TVA exempt)'
            ),
            'E3' => array(
                'label' => 'Ventes à distance taxables dans un autre État membre au profit des personnes non assujetties – Ventes B to C',
                'type' => 'base',
                'section' => 'A',
                'description' => 'Ventes à distance taxables dans un autre État membre au profit des personnes non assujetties – Ventes B to C',
                'pcg_accounts' => '7xxxx (distance sales), 4458xxx (TVA distance)'
            ),
            'E4' => array(
                'label' => 'Importations (autres que les produits pétroliers)',
                'type' => 'base',
                'section' => 'A',
                'description' => 'Importations (autres que les produits pétroliers)',
                'pcg_accounts' => '6xxxx (imports), 4452xxx (TVA import)'
            ),
            'E5' => array(
                'label' => 'Sorties de régime fiscal suspensif (autres que les produits pétroliers)',
                'type' => 'base',
                'section' => 'A',
                'description' => 'Sorties de régime fiscal suspensif (autres que les produits pétroliers)',
                'pcg_accounts' => '6xxxx (suspensive regime exits), 4452xxx (TVA suspensive)'
            ),
            'E6' => array(
                'label' => 'Importations placées sous régime fiscal suspensif (autres que les produits pétroliers)',
                'type' => 'base',
                'section' => 'A',
                'description' => 'Importations placées sous régime fiscal suspensif (autres que les produits pétroliers)',
                'pcg_accounts' => '6xxxx (suspensive regime imports), 4452xxx (TVA suspensive)'
            ),
            
            // F. Intracom Operations (part of Section A) - Notice 4722
            'F1' => array(
                'label' => 'Acquisitions intracommunautaires',
                'type' => 'base',
                'section' => 'A',
                'description' => 'Acquisitions intracommunautaires',
                'pcg_accounts' => '6xxxx (purchases from EU), 2xxxx (assets from EU)'
            ),
            'F2' => array(
                'label' => 'Livraisons intracommunautaires à destination d\'une personne assujettie – Ventes B to B',
                'type' => 'vat',
                'section' => 'A',
                'description' => 'Livraisons intracommunautaires à destination d\'une personne assujettie – Ventes B to B',
                'pcg_accounts' => '7xxxx (sales to EU), 4452xxx (TVA due autoliquidée sur livraisons intra-EU)'
            ),
            'F6' => array(
                'label' => 'Achats en franchise',
                'type' => 'base',
                'section' => 'A',
                'description' => 'Achats en franchise',
                'pcg_accounts' => '6xxxx (franchise purchases), 4458xxx (TVA franchise)'
            ),
            'F7' => array(
                'label' => 'Ventes de biens ou prestations de services réalisées par un assujetti non établi en France (article 283-1 du code général des impôts)',
                'type' => 'base',
                'section' => 'A',
                'description' => 'Ventes de biens ou prestations de services réalisées par un assujetti non établi en France (article 283-1 du code général des impôts)',
                'pcg_accounts' => '7xxxx (non-established sales), 4452xxx (TVA non-established)'
            ),
            'F8' => array(
                'label' => 'Régularisations (important : cf. notice)',
                'type' => 'base',
                'section' => 'A',
                'description' => 'Régularisations (important : cf. notice)',
                'pcg_accounts' => 'Various (adjustments), 445xxx (TVA adjustments)'
            ),
            
            // D. Résultat (Result) - Notice 4722
            '25' => array(
                'label' => 'TVA brute due (Total TVA due)',
                'type' => 'vat',
                'section' => 'D',
                'description' => 'Total VAT due (sum of all VAT due amounts)',
                'pcg_accounts' => 'Sum of 08 + 09 + 9B + 17'
            ),
            '26' => array(
                'label' => 'TVA déductible totale (Total deductible VAT)',
                'type' => 'vat',
                'section' => 'D',
                'description' => 'Total deductible VAT (sum of all deductible VAT amounts)',
                'pcg_accounts' => 'Sum of 20 + 21 + 22'
            ),
            '28' => array(
                'label' => 'TVA nette à payer',
                'type' => 'vat',
                'section' => 'D',
                'description' => 'Net VAT to pay (if total due > total deductible)',
                'pcg_accounts' => '445510 (État - TVA à décaisser)'
            ),
            '29' => array(
                'label' => 'Crédit de TVA à reporter ou remboursement',
                'type' => 'vat',
                'section' => 'D',
                'description' => 'VAT credit to carry forward or refund (if total deductible > total due)',
                'pcg_accounts' => '445670 (État - Crédit de TVA à reporter ou rembourser)'
            )
        );
    }

    /**
     * Get CA-3 section headers (Notice 4722)
     *
     * @return array Section headers
     */
    public function getCA3SectionHeaders()
    {
        return array(
            'A' => array(
                'title' => 'A. MONTANT DES OPÉRATIONS RÉALISÉES',
                'description' => '',
                'notice' => ''
            ),
            'B' => array(
                'title' => 'B. DÉCOMPTE DE LA TVA À PAYER',
                'description' => '',
                'notice' => ''
            )
        );
    }

    /**
     * Get supported VAT rates
     *
     * @return array VAT rates
     */
    public function getVATRates()
    {
        return array(
            '20.00' => '20%',
            '10.00' => '10%',
            '5.50' => '5.5%',
            '2.10' => '2.1%',
            '0.00' => '0%'
        );
    }

    /**
     * Validate account mapping
     *
     * @param string $ca3_line CA-3 line code
     * @param string $account_code Account code
     * @return bool Valid
     */
    public function validateAccountMapping($ca3_line, $account_code)
    {
        // Check if account exists in Dolibarr
        $sql = "SELECT COUNT(*) as count FROM " . MAIN_DB_PREFIX . "accounting_account 
                WHERE account_number = '" . $this->db->escape($account_code) . "' AND active = 1";

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

        return false;
    }

    /**
     * Get journal configuration
     *
     * @return array Journal configuration
     */
    public function getJournalConfiguration()
    {
        $default_config = array(
            'vat_to_pay' => '44551',      // TVA A DECAISSER
            'vat_to_receive' => '44567',  // TVA A PAYER
            'other_charges' => '658',     // AUTRES CHARGES DE GESTION COURANTE
            'other_products' => '758'     // AUTRES PRODUITS DE GESTION COURANT
        );

        $config = array();
        foreach ($default_config as $key => $default_value) {
            $config[$key] = $this->get('journal_' . $key, $default_value);
        }

        return $config;
    }

    /**
     * Update journal configuration
     *
     * @param array $journal_accounts Journal account configuration
     * @return bool Success
     */
    public function updateJournalConfiguration($journal_accounts)
    {
        $success = true;
        
        foreach ($journal_accounts as $key => $account_code) {
            if (!$this->set('journal_' . $key, $account_code)) {
                $success = false;
            }
        }

        return $success;
    }
}