<?php
require_once 'class/db-functions.php';

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

if (!isset($_GET['id']) || !is_numeric($_GET['id'])) {
    die("Invalid template ID");
}

$sourceTemplateId = (int)$_GET['id'];

try {
    $db = DBHandlerSelect::getInstance();
    $pdo = $db->getConnection();

    $pdo->beginTransaction();

    // 1. Get source template
    $stmt = $pdo->prepare("
        SELECT 
            name,
            source_type,
            header_row,
            start_column,
            description,
            target_table,
            sample_xlsx,
            button_size,
            button_bg_color,
            button_text_color,
            button_label,
            status,
            client_specific_fields,
            idclient,
            clientname,
            schemaname,
            idschema,
            schemajson,
            xls_headers,
            api_sample_json,
            json_nodes,
            idroutine
        FROM excel_templates
        WHERE id = ?
        LIMIT 1
    ");
    $stmt->execute([$sourceTemplateId]);
    $template = $stmt->fetch(PDO::FETCH_ASSOC);

    if (!$template) {
        throw new Exception("Template not found.");
    }

    // 2. Generate unique clone name
    $baseName = 'Copia di ' . $template['name'];
    $newName = $baseName;

    $checkStmt = $pdo->prepare("SELECT COUNT(*) FROM excel_templates WHERE name = ?");
    $checkStmt->execute([$newName]);

    if ((int)$checkStmt->fetchColumn() > 0) {
        $counter = 2;

        do {
            $newName = $baseName . ' (' . $counter . ')';
            $checkStmt->execute([$newName]);
            $exists = (int)$checkStmt->fetchColumn() > 0;
            $counter++;
        } while ($exists);
    }

    // 3. Insert cloned template
    $insertTemplate = $pdo->prepare("
        INSERT INTO excel_templates (
            name,
            source_type,
            created_at,
            updated_at,
            header_row,
            start_column,
            description,
            target_table,
            sample_xlsx,
            button_size,
            button_bg_color,
            button_text_color,
            button_label,
            status,
            client_specific_fields,
            idclient,
            clientname,
            schemaname,
            idschema,
            schemajson,
            xls_headers,
            api_sample_json,
            json_nodes,
            idroutine
        ) VALUES (
            :name,
            :source_type,
            NOW(),
            NOW(),
            :header_row,
            :start_column,
            :description,
            :target_table,
            :sample_xlsx,
            :button_size,
            :button_bg_color,
            :button_text_color,
            :button_label,
            :status,
            :client_specific_fields,
            :idclient,
            :clientname,
            :schemaname,
            :idschema,
            :schemajson,
            :xls_headers,
            :api_sample_json,
            :json_nodes,
            :idroutine
        )
    ");

    $insertTemplate->execute([
        ':name' => $newName,
        ':source_type' => $template['source_type'],
        ':header_row' => $template['header_row'],
        ':start_column' => $template['start_column'],
        ':description' => $template['description'],
        ':target_table' => $template['target_table'],
        ':sample_xlsx' => $template['sample_xlsx'],
        ':button_size' => $template['button_size'],
        ':button_bg_color' => $template['button_bg_color'],
        ':button_text_color' => $template['button_text_color'],
        ':button_label' => $template['button_label'],
        ':status' => $template['status'],
        ':client_specific_fields' => $template['client_specific_fields'],
        ':idclient' => $template['idclient'],
        ':clientname' => $template['clientname'],
        ':schemaname' => $template['schemaname'],
        ':idschema' => $template['idschema'],
        ':schemajson' => $template['schemajson'],
        ':xls_headers' => $template['xls_headers'],
        ':api_sample_json' => $template['api_sample_json'],
        ':json_nodes' => $template['json_nodes'],
        ':idroutine' => $template['idroutine']
    ]);

    $newTemplateId = (int)$pdo->lastInsertId();

    if ($newTemplateId <= 0) {
        throw new Exception("Unable to create cloned template.");
    }

    // 4. Clone template_mapping rows
    $cloneMappings = $pdo->prepare("
        INSERT INTO template_mapping (
            template_id,
            schema_id,
            field_id,
            excel_column,
            json_node,
            is_manual,
            manual_default,
            auto_value,
            data_type,
            is_required,
            default_value,
            has_list,
            length,
            decimals,
            min_value,
            max_value,
            default_curr_date,
            tablename,
            field_label,
            main_field,
            is_visible_import,
            is_visible_parts
        )
        SELECT
            :new_template_id,
            schema_id,
            field_id,
            excel_column,
            json_node,
            is_manual,
            manual_default,
            auto_value,
            data_type,
            is_required,
            default_value,
            has_list,
            length,
            decimals,
            min_value,
            max_value,
            default_curr_date,
            tablename,
            field_label,
            main_field,
            is_visible_import,
            is_visible_parts
        FROM template_mapping
        WHERE template_id = :source_template_id
    ");

    $cloneMappings->execute([
        ':new_template_id' => $newTemplateId,
        ':source_template_id' => $sourceTemplateId
    ]);

    $pdo->commit();

    header("Location: templates_dashboard.php?cloned=1&new_id=" . $newTemplateId);
    exit;
} catch (Exception $e) {
    if (isset($pdo) && $pdo->inTransaction()) {
        $pdo->rollBack();
    }

    die("Clone error: " . htmlspecialchars($e->getMessage(), ENT_QUOTES, 'UTF-8'));
}