<?php
declare(strict_types=1);

require_once __DIR__ . '/../config.php';

if (!function_exists('payment_methods_schema_sync_20260502_run')) {
    function payment_methods_schema_sync_20260502_run(): void
    {
        $pdo = db();

        payment_methods_schema_sync_20260502_exec(
            $pdo,
            "CREATE TABLE IF NOT EXISTS `payment_methods` (
"
            . "  `id` int(11) NOT NULL AUTO_INCREMENT,
"
            . "  `name_en` varchar(255) DEFAULT NULL,
"
            . "  `name_ar` varchar(255) DEFAULT NULL,
"
            . "  `created_at` timestamp NULL DEFAULT current_timestamp(),
"
            . "  PRIMARY KEY (`id`)
"
            . ") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci"
        );

        $columns = [
            'name_en' => 'VARCHAR(255) DEFAULT NULL',
            'name_ar' => 'VARCHAR(255) DEFAULT NULL',
            'created_at' => 'TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP',
        ];

        foreach ($columns as $column => $definition) {
            if (payment_methods_schema_sync_20260502_column_exists($pdo, 'payment_methods', $column)) {
                continue;
            }

            payment_methods_schema_sync_20260502_exec(
                $pdo,
                sprintf(
                    'ALTER TABLE `payment_methods` ADD COLUMN `%s` %s',
                    str_replace('`', '', $column),
                    $definition
                )
            );
        }

        payment_methods_schema_sync_20260502_backfill_legacy_names($pdo);
        payment_methods_schema_sync_20260502_seed_defaults($pdo);
    }

    function payment_methods_schema_sync_20260502_table_exists(PDO $pdo, string $table): bool
    {
        $stmt = $pdo->prepare(
            'SELECT 1 FROM information_schema.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = :table LIMIT 1'
        );
        $stmt->execute(['table' => $table]);

        return (bool)$stmt->fetchColumn();
    }

    function payment_methods_schema_sync_20260502_column_exists(PDO $pdo, string $table, string $column): bool
    {
        $stmt = $pdo->prepare(
            'SELECT 1 FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = :table AND COLUMN_NAME = :column LIMIT 1'
        );
        $stmt->execute([
            'table' => $table,
            'column' => $column,
        ]);

        return (bool)$stmt->fetchColumn();
    }

    function payment_methods_schema_sync_20260502_backfill_legacy_names(PDO $pdo): void
    {
        if (!payment_methods_schema_sync_20260502_table_exists($pdo, 'payment_methods')) {
            return;
        }

        $hasLegacyName = payment_methods_schema_sync_20260502_column_exists($pdo, 'payment_methods', 'name');
        $hasNameEn = payment_methods_schema_sync_20260502_column_exists($pdo, 'payment_methods', 'name_en');
        $hasNameAr = payment_methods_schema_sync_20260502_column_exists($pdo, 'payment_methods', 'name_ar');

        if ($hasLegacyName && $hasNameEn) {
            $pdo->exec(
                "UPDATE `payment_methods`
                 SET `name_en` = CASE
                     WHEN `name_en` IS NULL OR TRIM(`name_en`) = '' THEN `name`
                     ELSE `name_en`
                 END
                 WHERE `name` IS NOT NULL AND TRIM(`name`) <> ''"
            );
        }

        if ($hasNameAr) {
            $sourceExpression = $hasLegacyName ? "COALESCE(NULLIF(`name_en`, ''), `name`)" : '`name_en`';
            $pdo->exec(
                "UPDATE `payment_methods`
                 SET `name_ar` = $sourceExpression
                 WHERE (`name_ar` IS NULL OR TRIM(`name_ar`) = '')
                   AND $sourceExpression IS NOT NULL
                   AND TRIM($sourceExpression) <> ''"
            );
        }
    }

    function payment_methods_schema_sync_20260502_seed_defaults(PDO $pdo): void
    {
        if (!payment_methods_schema_sync_20260502_table_exists($pdo, 'payment_methods')) {
            return;
        }

        $count = (int)$pdo->query('SELECT COUNT(*) FROM `payment_methods`')->fetchColumn();
        if ($count > 0) {
            return;
        }

        $defaults = [
            ['Cash', 'كاش'],
            ['Credit Card', 'بطاقة بنكية'],
            ['Bank Transfer', 'تحويل بنكي'],
        ];

        $stmt = $pdo->prepare('INSERT INTO `payment_methods` (`name_en`, `name_ar`) VALUES (?, ?)');
        foreach ($defaults as [$nameEn, $nameAr]) {
            $stmt->execute([$nameEn, $nameAr]);
        }
    }

    function payment_methods_schema_sync_20260502_exec(PDO $pdo, string $statement): void
    {
        try {
            $pdo->exec($statement);
        } catch (PDOException $exception) {
            if (payment_methods_schema_sync_20260502_is_ignorable($exception)) {
                return;
            }

            throw $exception;
        }
    }

    function payment_methods_schema_sync_20260502_is_ignorable(PDOException $exception): bool
    {
        $driverCode = isset($exception->errorInfo[1]) ? (int)$exception->errorInfo[1] : null;
        $message = strtolower($exception->getMessage());
        $ignorableCodes = [1050, 1060, 1061, 1062, 1091, 1826];
        $ignorableSnippets = [
            'already exists',
            'duplicate column name',
            'duplicate key name',
            'duplicate entry',
            'duplicate foreign key constraint name',
            'duplicate key on write or update',
            'errno: 121',
            'check that column/key exists',
        ];

        if ($driverCode !== null && in_array($driverCode, $ignorableCodes, true)) {
            return true;
        }

        foreach ($ignorableSnippets as $snippet) {
            if (str_contains($message, $snippet)) {
                return true;
            }
        }

        return false;
    }
}

payment_methods_schema_sync_20260502_run();

return true;