<?php
/**
 * AKSRT Admin — AI Controller
 *
 * Owns REST routes for the "AI 子系统" domain.
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

class AKSRT_Admin_AI_Controller extends AKSRT_Admin_Controller_Base {

    private static $instance = null;

    public static function get_instance(): self {
        if (null === self::$instance) self::$instance = new self();
        return self::$instance;
    }

    public function register_routes(): void {
        // AI status
        register_rest_route(self::API_NAMESPACE, '/ai/status', [
            'methods'             => 'GET',
            'callback'            => [$this, 'get_status'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        // AI settings update
        register_rest_route(self::API_NAMESPACE, '/ai/settings', [
            'methods'             => 'POST',
            'callback'            => [$this, 'update_settings'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        // AI SEO suggest
        register_rest_route(self::API_NAMESPACE, '/ai/seo-suggest', [
            'methods'             => 'POST',
            'callback'            => [$this, 'seo_suggest'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        // AI summary suggest
        register_rest_route(self::API_NAMESPACE, '/ai/summary-suggest', [
            'methods'             => 'POST',
            'callback'            => [$this, 'summary_suggest'],
            'permission_callback' => [$this, 'check_permission'],
        ]);

        // AI tags suggest
        register_rest_route(self::API_NAMESPACE, '/ai/tags-suggest', [
            'methods'             => 'POST',
            'callback'            => [$this, 'tags_suggest'],
            'permission_callback' => [$this, 'check_permission'],
        ]);
    }

    /**
     * GET /ai/status — AI 状态
     */
    public function get_status(): WP_REST_Response {
        if (!class_exists('AKSRT_AI')) {
            return $this->success(['data' => [
                'enabled'    => false,
                'provider'   => 'none',
                'configured' => false,
                'available'  => false,
            ]]);
        }

        return $this->success(['data' => AKSRT_AI::get_instance()->get_status()]);
    }

    /**
     * POST /ai/settings — 更新 AI 设置
     */
    public function update_settings(WP_REST_Request $request): WP_REST_Response {
        if (!class_exists('AKSRT_AI')) {
            return $this->error('AI 模块未加载', 500);
        }

        $params = $this->get_json_params($request);

        $allowed = [
            'enabled'    => 'bool',
            'provider'   => 'string',
            'api_key'    => 'string',
            'api_base'   => 'url',
            'model'      => 'string',
            'max_tokens' => 'int',
            'rate_limit' => 'int',
        ];

        $config = [];
        foreach ($allowed as $key => $type) {
            if (!isset($params[$key])) continue;
            switch ($type) {
                case 'bool':
                    $config[$key] = !empty($params[$key]);
                    break;
                case 'int':
                    $config[$key] = (int) $params[$key];
                    break;
                case 'url':
                    $config[$key] = esc_url_raw((string) $params[$key]);
                    break;
                default:
                    $config[$key] = sanitize_text_field((string) $params[$key]);
            }
        }

        $success = AKSRT_AI::get_instance()->update_config($config);

        if ($success) {
            return $this->success(['message' => __('AI 设置已保存', 'aksrt')]);
        }
        return $this->error(__('保存失败', 'aksrt'));
    }

    /**
     * POST /ai/seo-suggest — SEO 建议
     */
    public function seo_suggest(WP_REST_Request $request): WP_REST_Response {
        if (!class_exists('AKSRT_AI_SEO')) {
            return $this->error('AI SEO 模块未加载', 500);
        }

        $params  = $this->get_json_params($request);
        $title   = sanitize_text_field((string) ($params['title'] ?? ''));
        $content = wp_kses_post((string) ($params['content'] ?? ''));

        if (empty($title)) {
            return $this->error('标题不能为空');
        }

        $result = AKSRT_AI_SEO::get_instance()->suggest($title, $content);

        if ($result['success']) {
            return $this->success(['data' => $result['data']]);
        }

        return $this->error($result['message'] ?? '生成失败');
    }

    /**
     * POST /ai/summary-suggest — 摘要建议
     */
    public function summary_suggest(WP_REST_Request $request): WP_REST_Response {
        if (!class_exists('AKSRT_AI') || !class_exists('AKSRT_AI_Prompt')) {
            return $this->error('AI 模块未加载', 500);
        }

        $params  = $this->get_json_params($request);
        $title   = sanitize_text_field((string) ($params['title'] ?? ''));
        $content = wp_kses_post((string) ($params['content'] ?? ''));
        $max_len = max(50, min(500, (int) ($params['max_length'] ?? 200)));

        if (empty($content)) {
            return $this->error('内容不能为空');
        }

        $prompt = AKSRT_AI_Prompt::get_instance()->build_summary_prompt($content, $max_len);
        $result = AKSRT_AI::get_instance()->generate($prompt);

        if ($result['success']) {
            return $this->success(['data' => ['summary' => $result['content']]]);
        }

        return $this->error($result['message'] ?? '生成失败');
    }

    /**
     * POST /ai/tags-suggest — 标签建议
     */
    public function tags_suggest(WP_REST_Request $request): WP_REST_Response {
        if (!class_exists('AKSRT_AI') || !class_exists('AKSRT_AI_Prompt')) {
            return $this->error('AI 模块未加载', 500);
        }

        $params  = $this->get_json_params($request);
        $title   = sanitize_text_field((string) ($params['title'] ?? ''));
        $content = wp_kses_post((string) ($params['content'] ?? ''));

        if (empty($title) && empty($content)) {
            return $this->error('标题或内容不能为空');
        }

        $prompt = AKSRT_AI_Prompt::get_instance()->build_tags_prompt($title, $content);
        $result = AKSRT_AI::get_instance()->generate($prompt);

        if ($result['success']) {
            $tags = json_decode($result['content'], true);
            if (!is_array($tags)) {
                $tags = array_filter(array_map('trim', explode(',', $result['content'])));
            }
            return $this->success(['data' => ['tags' => $tags]]);
        }

        return $this->error($result['message'] ?? '生成失败');
    }
}