<?php

if (!defined('ABSPATH')) {
    exit;
}

class AdGhost_REST_Controller {

    const NAMESPACE = 'adghost/v1';

    public function init() {
        add_action('rest_api_init', [$this, 'register_routes']);
    }

    public function can_manage() {
        return current_user_can('manage_options');
    }

    public function register_routes() {
        $auth = [$this, 'can_manage'];

        register_rest_route(self::NAMESPACE, '/config', [
            [
                'methods'             => 'GET',
                'callback'            => [$this, 'get_config'],
                'permission_callback' => $auth,
            ],
            [
                'methods'             => 'PUT',
                'callback'            => [$this, 'update_config'],
                'permission_callback' => $auth,
            ],
        ]);

        register_rest_route(self::NAMESPACE, '/deploy', [
            'methods'             => 'POST',
            'callback'            => [$this, 'deploy'],
            'permission_callback' => $auth,
        ]);

        register_rest_route(self::NAMESPACE, '/ad-units/export', [
            'methods'             => 'GET',
            'callback'            => [$this, 'export_units'],
            'permission_callback' => $auth,
        ]);

        register_rest_route(self::NAMESPACE, '/ad-units/import', [
            'methods'             => 'POST',
            'callback'            => [$this, 'import_units'],
            'permission_callback' => $auth,
        ]);

        register_rest_route(self::NAMESPACE, '/ads-txt/validate', [
            'methods'             => 'POST',
            'callback'            => [$this, 'validate_ads_txt'],
            'permission_callback' => $auth,
        ]);
    }

    public function get_config() {
        return rest_ensure_response(AdGhost_Plugin::get_instance()->get_config());
    }

    public function update_config(WP_REST_Request $request) {
        $data = $request->get_json_params();
        if (!is_array($data)) {
            $data = $request->get_params();
        }

        $result = AdGhost_Plugin::get_instance()->apply_config(AdGhost_Plugin::sanitize_request((array) $data));
        if (!$result['success']) {
            return new WP_Error('adghost_save_failed', $result['error'], ['status' => 500]);
        }

        return rest_ensure_response([
            'success' => true,
            'config'  => AdGhost_Plugin::get_instance()->get_config(),
        ]);
    }

    public function deploy() {
        $result = AdGhost_Plugin::get_instance()->activate_runtime();
        if (empty($result['success'])) {
            return new WP_Error('adghost_deploy_failed', $result['error'] ?? 'Deploy failed', ['status' => 502]);
        }

        return rest_ensure_response([
            'success'    => true,
            'is_active'  => true,
            'message'    => 'Runtime deployed. Ads are now live.',
        ]);
    }

    public function export_units(WP_REST_Request $request) {
        $ad_units = get_option('adghost_ad_units', []);
        $csv = AdGhost_CSV_Exporter::generate($ad_units, rest_sanitize_boolean($request->get_param('only_new')));

        $response = new WP_REST_Response($csv);
        $response->header('Content-Type', 'text/csv; charset=utf-8');
        $response->header(
            'Content-Disposition',
            'attachment; filename=adghost-gam-units-' . gmdate('Y-m-d') . '.csv'
        );
        return $response;
    }

    public function import_units(WP_REST_Request $request) {
        $files = $request->get_file_params();

        if (!empty($files['csv_file']['tmp_name'])) {
            $tmp = $files['csv_file']['tmp_name'];

            if (!is_uploaded_file($tmp)) {
                return new WP_Error('adghost_import_failed', 'No file uploaded', ['status' => 400]);
            }
            require_once plugin_dir_path(__FILE__) . 'class-csv-importer.php';
            $result = AdGhost_CSV_Importer::parse($tmp);
            if (is_wp_error($result)) {
                return new WP_Error('adghost_import_failed', $result->get_error_message(), ['status' => 400]);
            }
            return rest_ensure_response(['success' => true, 'units' => $result]);
        }

        $csv_text = (string) $request->get_param('csv');
        if ($csv_text === '') {
            return new WP_Error('adghost_import_empty', 'No CSV file or content provided', ['status' => 400]);
        }

        require_once plugin_dir_path(__FILE__) . 'class-csv-importer.php';
        $result = AdGhost_CSV_Importer::parse_string($csv_text);

        if (is_wp_error($result)) {
            return new WP_Error('adghost_import_failed', $result->get_error_message(), ['status' => 400]);
        }
        return rest_ensure_response(['success' => true, 'units' => $result]);
    }

    public function validate_ads_txt(WP_REST_Request $request) {
        $content = (string) $request->get_param('content');
        return rest_ensure_response([
            'success'    => true,
            'validation' => AdGhost_Ads_Txt::validate_ads_txt($content),
        ]);
    }
}