<?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;
    }

    /**
     * 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
        if (!empty($account_codes)) {
            foreach ($account_codes as $account_code) {
                if (!empty($account_code)) {
                    $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()) 
                            ON DUPLICATE KEY UPDATE 
                            is_active = 1, account_code = '" . $this->db->escape($account_code) . "'";
                    $this->db->query($sql);
                }
            }
        }
        
        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()
    {
        $sql = "SELECT account_number, label FROM " . MAIN_DB_PREFIX . "accounting_account 
                WHERE active = 1 
                ORDER BY account_number";

        $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 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' => 'Montant HT des opérations imposables normales (biens + services imposables en France à 20%, 10%, 5,5%, 2,1%)',
                'type' => 'base',
                'section' => 'A',
                'description' => 'HT amount of all taxable operations that form normal sales (goods + services taxable in France at 20%, 10%, 5,5%, 2,1%)',
                'pcg_accounts' => 'Sales: 7xxxx; VAT: 44571x / 44572x / 44573x / 44574x'
            ),
            'A2' => array(
                'label' => 'Montant HT des opérations imposables spéciales ne relevant pas du CA courant (cessions d\'immobilisations, livraisons à soi-même)',
                'type' => 'base',
                'section' => 'A',
                'description' => 'HT amount of special taxable operations not part of ordinary turnover (e.g. cessions d\'immobilisations, livraisons à soi-même)',
                'pcg_accounts' => '775xxx (gains on disposal), 72xxx (production immobilisée), VAT: 44571x'
            ),
            'A3' => array(
                'label' => 'Montant HT des services achetés à des prestataires non établis en France mais imposables en France (autoliquidation services étrangers)',
                'type' => 'base',
                'section' => 'A',
                'description' => 'HT amount of services purchased from providers not established in France but taxable in France (reverse charge for foreign services)',
                'pcg_accounts' => '6xxxx (services purchased), 4452xxx (TVA due autoliquidée)'
            ),
            'A4' => array(
                'label' => 'Montant HT des importations imposables en France (hors UE), à l\'exclusion des produits pétroliers',
                'type' => 'base',
                'section' => 'A',
                'description' => 'HT amount of imports taxable in France (non-EU), excluding petroleum products',
                'pcg_accounts' => '6xxxx / 2xxxx purchases or assets; VAT: 4452xxx (import VAT)'
            ),
            'A5' => array(
                'label' => 'Montant HT des opérations imposables à la sortie d\'un régime fiscal suspensif (régimes douaniers, zones franches, etc.)',
                'type' => 'base',
                'section' => 'A',
                'description' => 'HT amount of taxable operations at exit from a suspensive fiscal regime (customs regimes, free zones, etc.)',
                '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%',
                'type' => 'vat',
                'section' => 'B',
                'description' => 'VAT amounts due, calculated on A1/A2 bases at 20% rate',
                'pcg_accounts' => '44571x (TVA collectée à 20%)'
            ),
            '09' => array(
                'label' => 'TVA due au taux de 10%',
                'type' => 'vat',
                'section' => 'B',
                'description' => 'VAT amounts due, calculated on A1/A2 bases at 10% rate',
                'pcg_accounts' => '44572x (TVA collectée à 10%)'
            ),
            '9B' => array(
                'label' => 'TVA due aux taux réduits (5,5% et 2,1%)',
                'type' => 'vat',
                'section' => 'B',
                'description' => 'VAT amounts due, calculated on A1/A2 bases at reduced rates (5,5% and 2,1%)',
                'pcg_accounts' => '44573x (5,5%) / 44574x (2,1%) (TVA collectée aux taux réduits)'
            ),
            '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)'
            ),
            
            // C. Décompte de la TVA déductible (Deductible VAT Calculation) - Notice 4722
            '20' => array(
                'label' => 'TVA déductible sur immobilisations',
                'type' => 'vat',
                'section' => 'C',
                'description' => 'Deductible VAT on capital goods (fixed assets)',
                'pcg_accounts' => '44562x (TVA déductible sur immobilisations)'
            ),
            '21' => array(
                'label' => 'TVA déductible sur autres biens et services',
                'type' => 'vat',
                'section' => 'C',
                'description' => 'Deductible VAT on other goods and services (operating expenses)',
                'pcg_accounts' => '44566x (TVA déductible sur autres biens et services)'
            ),
            '22' => array(
                'label' => 'TVA déductible sur importations',
                'type' => 'vat',
                'section' => 'C',
                'description' => 'Deductible VAT on imports',
                'pcg_accounts' => '44566x / 44562x (TVA déductible sur importations)'
            ),
            
            // 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. Opérations imposables (Taxable Operations)',
                'description' => 'HT amounts of all taxable operations according to Notice 4722 (3310-CA3-SD)',
                'notice' => 'Notice 4722 - Summary Table CA3 (3310-CA3-SD)'
            ),
            'B' => array(
                'title' => 'B. Décompte de la TVA due (VAT Due Calculation)',
                'description' => 'VAT amounts due, calculated on A1/A2 bases per applicable rate',
                'notice' => 'Notice 4722 - VAT Due Calculation'
            ),
            'C' => array(
                'title' => 'C. Décompte de la TVA déductible (Deductible VAT Calculation)',
                'description' => 'VAT amounts that can be deducted from purchases and expenses',
                'notice' => 'Notice 4722 - Deductible VAT Calculation'
            ),
            'D' => array(
                'title' => 'D. Résultat (Result)',
                'description' => 'Final calculation: net VAT to pay or credit to carry forward',
                'notice' => 'Notice 4722 - Final Result'
            )
        );
    }

    /**
     * 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;
    }
}