<?php
header('Content-Type: application/json');
require_once 'class/db-functions.php';

$response = ["success" => false, "message" => ""];

try {
    if ($_SERVER["REQUEST_METHOD"] !== "POST") {
        throw new Exception("Invalid request method.");
    }

    // Retrieve and sanitize form data
    $id = intval($_POST['id'] ?? 0);
    $name = trim($_POST['name'] ?? '');
    $source_type = strtoupper(trim($_POST['source_type'] ?? 'XLS'));

    $header_row = isset($_POST['header_row']) && $_POST['header_row'] !== ''
        ? intval($_POST['header_row'])
        : null;

    $start_column = trim($_POST['start_column'] ?? '');

    $xls_sheet_index = isset($_POST['xls_sheet_index']) && $_POST['xls_sheet_index'] !== ''
        ? intval($_POST['xls_sheet_index'])
        : 0;

    $api_config_id = isset($_POST['api_config_id']) && $_POST['api_config_id'] !== ''
        ? intval($_POST['api_config_id'])
        : null;

    $description = trim($_POST['description'] ?? '');
    $target_table = trim($_POST['target_table'] ?? 'datadb');
    $idclient = intval($_POST['client_id'] ?? 0);
    $clientname = trim($_POST['client_name'] ?? '');
    $idschema = intval($_POST['idschema'] ?? 0);
    $schemaname = trim($_POST['schemaname'] ?? '');
    $idroutine = isset($_POST['idroutine']) && $_POST['idroutine'] !== '' ? intval($_POST['idroutine']) : null;
    $button_size = trim($_POST['button_size'] ?? 'medium');
    $button_bg_color = trim($_POST['button_bg_color'] ?? '#007bff');
    $button_text_color = trim($_POST['button_text_color'] ?? '#ffffff');
    $button_label = trim($_POST['button_label'] ?? 'Click Me');

    // Allowed source types
    if (!in_array($source_type, ['XLS', 'API', 'JSON', 'PDF'], true)) {
        $source_type = 'XLS';
    }

    // Required fields validation
    if ($id <= 0 || $name === '' || $target_table === '' || $idclient <= 0 || $idschema <= 0) {
        throw new Exception("All fields marked with * are required, including client and schema.");
    }

    // XLS-only validation
    if ($source_type === 'XLS') {
        if ($header_row === null || $header_row <= 0 || $start_column === '') {
            throw new Exception("Header Row and Start Column are required for XLS templates.");
        }

        if ($xls_sheet_index < 0) {
            throw new Exception("XLS Sheet Number cannot be negative.");
        }

        $api_config_id = null;
    }

    // API/JSON validation
    if ($source_type === 'API' || $source_type === 'JSON') {
        if (empty($api_config_id)) {
            throw new Exception("API/JSON configuration is required for API or JSON templates.");
        }

        $header_row = null;
        $start_column = null;
        $xls_sheet_index = null;
    }

    // PDF currently does not require XLS coordinates or API configuration
    if ($source_type === 'PDF') {
        $header_row = null;
        $start_column = null;
        $xls_sheet_index = null;
        $api_config_id = null;
    }

    // Database connection
    $db = DBHandlerSelect::getInstance();
    $pdo = $db->getConnection();

    // Optional check: verify API configuration exists and is active
    if ($api_config_id !== null) {
        $stmt = $pdo->prepare("
            SELECT COUNT(*) 
            FROM api_configurations 
            WHERE id = ? 
              AND is_active = 1
        ");
        $stmt->execute([$api_config_id]);

        if ((int)$stmt->fetchColumn() === 0) {
            throw new Exception("Selected API/JSON configuration does not exist or is not active.");
        }
    }

    // Update template
    $stmt = $pdo->prepare("
        UPDATE excel_templates
        SET
            name = ?,
            source_type = ?,
            header_row = ?,
            start_column = ?,
            xls_sheet_index = ?,
            api_config_id = ?,
            description = ?,
            target_table = ?,
            idclient = ?,
            clientname = ?,
            schemaname = ?,
            idschema = ?,
            idroutine = ?,
            button_size = ?,
            button_bg_color = ?,
            button_text_color = ?,
            button_label = ?,
            updated_at = NOW()
        WHERE id = ?
    ");

    $stmt->execute([
        $name,
        $source_type,
        $header_row,
        $start_column,
        $xls_sheet_index,
        $api_config_id,
        $description,
        $target_table,
        $idclient,
        $clientname,
        $schemaname,
        $idschema,
        $idroutine,
        $button_size,
        $button_bg_color,
        $button_text_color,
        $button_label,
        $id
    ]);

    $response["success"] = true;
    $response["message"] = "Template updated successfully!";
} catch (Exception $e) {
    $response["message"] = $e->getMessage();
}

echo json_encode($response);