<?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
     *
     * @param string $ca3_line CA-3 line code
     * @param string $account_code Account code
     * @param string $account_label Account label
     * @param float $vat_rate VAT rate
     * @return bool Success
     */
    public function updateAccountMapping($ca3_line, $account_code, $account_label, $vat_rate)
    {
        $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) . "', '" . $this->db->escape($account_label) . "', 
                " . $vat_rate . ", 1, NOW()) 
                ON DUPLICATE KEY UPDATE 
                account_code = '" . $this->db->escape($account_code) . "', 
                account_label = '" . $this->db->escape($account_label) . "', 
                vat_rate = " . $vat_rate;

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

    /**
     * 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 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
     *
     * @return array CA-3 line definitions
     */
    public function getCA3LineDefinitions()
    {
        return array(
            // A. Opérations imposables (Taxable Operations)
            'A1' => array('label' => 'Montant hors TVA des opérations imposables', 'type' => 'base', 'section' => 'A'),
            'A2' => array('label' => 'Opérations imposables mais ne relevant pas du CA courant', 'type' => 'base', 'section' => 'A'),
            'B1' => array('label' => 'Répartition 20% (base + taxe)', 'type' => 'vat', 'section' => 'A'),
            'B2' => array('label' => 'Répartition 10% (base + taxe)', 'type' => 'vat', 'section' => 'A'),
            'B3' => array('label' => 'Répartition 5,5% (base + taxe)', 'type' => 'vat', 'section' => 'A'),
            'B4' => array('label' => 'Répartition 2,1% (base + taxe)', 'type' => 'vat', 'section' => 'A'),
            
            // A. Opérations intracommunautaires (Intra-EU Operations)
            '05' => array('label' => 'Livraisons intracommunautaires (B2B)', 'type' => 'base', 'section' => 'A'),
            '06' => array('label' => 'Prestations intracommunautaires (B2B)', 'type' => 'base', 'section' => 'A'),
            
            // B. TVA due (VAT Due)
            '17' => array('label' => 'TVA due au titre des acquisitions intracommunautaires', 'type' => 'vat', 'section' => 'B'),
            
            // C. TVA déductible (Deductible VAT)
            '20' => array('label' => 'TVA déductible sur immobilisations', 'type' => 'vat', 'section' => 'C'),
            '21' => array('label' => 'TVA déductible sur autres biens et services', 'type' => 'vat', 'section' => 'C'),
            
            // D. Résultat (Result)
            '22' => array('label' => 'Crédit de TVA reportable', 'type' => 'vat', 'section' => 'D'),
            '28' => array('label' => 'TVA nette à payer', 'type' => 'vat', 'section' => 'D'),
            '29' => array('label' => 'Crédit de TVA à reporter ou remboursement', 'type' => 'vat', 'section' => 'D')
        );
    }

    /**
     * Get CA-3 section headers
     *
     * @return array Section headers
     */
    public function getCA3SectionHeaders()
    {
        return array(
            'A' => array(
                'title' => 'A. Opérations imposables (Taxable Operations)',
                'description' => 'Base amounts and VAT for domestic taxable operations'
            ),
            'B' => array(
                'title' => 'B. TVA due (VAT Due)',
                'description' => 'VAT amounts due from intra-EU acquisitions and other sources'
            ),
            'C' => array(
                'title' => 'C. TVA déductible (Deductible VAT)',
                'description' => 'VAT amounts that can be deducted from purchases and expenses'
            ),
            'D' => array(
                'title' => 'D. Résultat (Result)',
                'description' => 'Final calculation: net VAT to pay or credit to carry forward'
            )
        );
    }

    /**
     * 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;
    }
}