<?php
/**
 * SEO Analytics API Endpoints Class
 *
 * REST API endpoints for SEO analytics data collection, Google API integration,
 * and AI-powered insights generation. Provides comprehensive API access to
 * Analytics Manager functionality with proper authentication, validation,
 * and error handling.
 *
 * @package ThinkRank
 * @subpackage API
 * @since 1.0.0
 */

declare(strict_types=1);

namespace ThinkRank\API;

use ThinkRank\SEO\Analytics_Manager;
use WP_REST_Controller;
use WP_REST_Request;
use WP_REST_Response;
use WP_Error;

// Prevent direct access
if (!defined('ABSPATH')) {
    exit;
}

/**
 * SEO Analytics API Endpoints Class
 *
 * Provides REST API endpoints for SEO analytics operations including
 * Google API integration, dashboard data retrieval, SEO opportunities
 * analysis, and connection management with proper authentication and validation.
 *
 * @since 1.0.0
 */
class SEO_Analytics_Endpoint extends WP_REST_Controller {

    /**
     * Analytics Manager instance
     *
     * @since 1.0.0
     * @var Analytics_Manager
     */
    private Analytics_Manager $analytics_manager;

    /**
     * API namespace
     *
     * @since 1.0.0
     * @var string
     */
    protected $namespace = 'thinkrank/v1';

    /**
     * API resource base
     *
     * @since 1.0.0
     * @var string
     */
    protected $rest_base = 'seo-analytics';

    /**
     * Constructor
     *
     * @since 1.0.0
     * @param Analytics_Manager|null $analytics_manager Analytics manager instance
     */
    public function __construct(?Analytics_Manager $analytics_manager = null) {
        $this->analytics_manager = $analytics_manager ?? new Analytics_Manager();
    }

    /**
     * Register API routes
     * Following ThinkRank endpoint registration patterns
     *
     * @since 1.0.0
     */
    public function register_routes(): void {
        // Test Google API connections
        register_rest_route(
            $this->namespace,
            '/' . $this->rest_base . '/test-connections',
            [
                [
                    'methods' => 'GET',
                    'callback' => [$this, 'test_connections'],
                    'permission_callback' => [$this, 'check_permissions'],
                ]
            ]
        );

        // Get dashboard data
        register_rest_route(
            $this->namespace,
            '/' . $this->rest_base . '/dashboard',
            [
                [
                    'methods' => 'GET',
                    'callback' => [$this, 'get_dashboard_data'],
                    'permission_callback' => [$this, 'check_permissions'],
                    'args' => $this->get_dashboard_args()
                ]
            ]
        );

        // Get SEO opportunities
        register_rest_route(
            $this->namespace,
            '/' . $this->rest_base . '/opportunities',
            [
                [
                    'methods' => 'GET',
                    'callback' => [$this, 'get_seo_opportunities'],
                    'permission_callback' => [$this, 'check_permissions'],
                    'args' => $this->get_opportunities_args()
                ]
            ]
        );

        // Setup Search Console verification
        register_rest_route(
            $this->namespace,
            '/' . $this->rest_base . '/setup/search-console',
            [
                [
                    'methods' => 'POST',
                    'callback' => [$this, 'setup_search_console'],
                    'permission_callback' => [$this, 'check_permissions'],
                    'args' => $this->get_setup_args()
                ]
            ]
        );

        // Get indexing status
        register_rest_route(
            $this->namespace,
            '/' . $this->rest_base . '/indexing-status',
            [
                [
                    'methods' => 'GET',
                    'callback' => [$this, 'get_indexing_status'],
                    'permission_callback' => [$this, 'check_permissions'],
                ]
            ]
        );

        // Refresh cached data
        register_rest_route(
            $this->namespace,
            '/' . $this->rest_base . '/refresh',
            [
                [
                    'methods' => 'POST',
                    'callback' => [$this, 'refresh_data'],
                    'permission_callback' => [$this, 'check_permissions'],
                ]
            ]
        );

        // Get client status (for debugging)
        register_rest_route(
            $this->namespace,
            '/' . $this->rest_base . '/status',
            [
                [
                    'methods' => 'GET',
                    'callback' => [$this, 'get_client_status'],
                    'permission_callback' => [$this, 'check_permissions'],
                ]
            ]
        );

        // ========================================
        // SEO Intelligence Enhancement Endpoints
        // ========================================

        // Get intelligent dashboard data with trends and insights
        register_rest_route(
            $this->namespace,
            '/' . $this->rest_base . '/intelligent-dashboard',
            [
                [
                    'methods' => 'GET',
                    'callback' => [$this, 'get_intelligent_dashboard'],
                    'permission_callback' => [$this, 'check_permissions'],
                    'args' => $this->get_dashboard_args()
                ]
            ]
        );

        // Get intelligent SEO opportunities with prioritization
        register_rest_route(
            $this->namespace,
            '/' . $this->rest_base . '/intelligent-opportunities',
            [
                [
                    'methods' => 'GET',
                    'callback' => [$this, 'get_intelligent_opportunities'],
                    'permission_callback' => [$this, 'check_permissions'],
                    'args' => $this->get_opportunities_args()
                ]
            ]
        );

        // Get SEO insights
        register_rest_route(
            $this->namespace,
            '/' . $this->rest_base . '/insights',
            [
                [
                    'methods' => 'GET',
                    'callback' => [$this, 'get_seo_insights'],
                    'permission_callback' => [$this, 'check_permissions'],
                    'args' => $this->get_dashboard_args()
                ]
            ]
        );
    }

    /**
     * Test Google API connections
     * Following ThinkRank response patterns
     *
     * @param WP_REST_Request $request Request object
     * @return WP_REST_Response|WP_Error Response object
     */
    public function test_connections(WP_REST_Request $request): WP_REST_Response|WP_Error {
        try {
            $connection_results = $this->analytics_manager->test_connections();

            return new WP_REST_Response([
                'success' => true,
                'data' => $connection_results,
                'message' => 'Connection tests completed'
            ], 200);

        } catch (\Exception $e) {
            return new WP_Error(
                'connection_test_failed',
                'Connection test failed: ' . $e->getMessage(),
                ['status' => 500]
            );
        }
    }

    /**
     * Get analytics dashboard data
     *
     * @param WP_REST_Request $request Request object
     * @return WP_REST_Response|WP_Error Response object
     */
    public function get_dashboard_data(WP_REST_Request $request): WP_REST_Response|WP_Error {
        try {
            $date_range = $request->get_param('date_range');
            $dashboard_data = $this->analytics_manager->get_dashboard_data($date_range);

            return new WP_REST_Response([
                'success' => true,
                'data' => $dashboard_data,
                'message' => 'Dashboard data retrieved successfully'
            ], 200);

        } catch (\Exception $e) {
            return new WP_Error(
                'dashboard_data_failed',
                'Failed to retrieve dashboard data: ' . $e->getMessage(),
                ['status' => 500]
            );
        }
    }

    /**
     * Get SEO opportunities
     *
     * @param WP_REST_Request $request Request object
     * @return WP_REST_Response|WP_Error Response object
     */
    public function get_seo_opportunities(WP_REST_Request $request): WP_REST_Response|WP_Error {
        try {
            $date_range = $request->get_param('date_range');
            $opportunities = $this->analytics_manager->get_seo_opportunities($date_range);

            return new WP_REST_Response([
                'success' => true,
                'data' => $opportunities,
                'message' => 'SEO opportunities retrieved successfully'
            ], 200);

        } catch (\Exception $e) {
            return new WP_Error(
                'opportunities_failed',
                'Failed to retrieve SEO opportunities: ' . $e->getMessage(),
                ['status' => 500]
            );
        }
    }

    /**
     * Setup Search Console verification
     *
     * @param WP_REST_Request $request Request object
     * @return WP_REST_Response|WP_Error Response object
     */
    public function setup_search_console(WP_REST_Request $request): WP_REST_Response|WP_Error {
        try {
            $site_url = $request->get_param('site_url');
            $setup_result = $this->analytics_manager->setup_search_console_verification($site_url);

            return new WP_REST_Response([
                'success' => $setup_result['success'],
                'data' => $setup_result,
                'message' => $setup_result['message']
            ], $setup_result['success'] ? 200 : 400);

        } catch (\Exception $e) {
            return new WP_Error(
                'setup_failed',
                'Search Console setup failed: ' . $e->getMessage(),
                ['status' => 500]
            );
        }
    }

    /**
     * Get indexing status
     *
     * @param WP_REST_Request $request Request object
     * @return WP_REST_Response|WP_Error Response object
     */
    public function get_indexing_status(WP_REST_Request $request): WP_REST_Response|WP_Error {
        try {
            $indexing_status = $this->analytics_manager->get_indexing_status();

            return new WP_REST_Response([
                'success' => true,
                'data' => $indexing_status,
                'message' => 'Indexing status retrieved successfully'
            ], 200);

        } catch (\Exception $e) {
            return new WP_Error(
                'indexing_status_failed',
                'Failed to retrieve indexing status: ' . $e->getMessage(),
                ['status' => 500]
            );
        }
    }

    /**
     * Refresh cached analytics data
     *
     * @param WP_REST_Request $request Request object
     * @return WP_REST_Response|WP_Error Response object
     */
    public function refresh_data(WP_REST_Request $request): WP_REST_Response|WP_Error {
        try {
            $refresh_result = $this->analytics_manager->refresh_data();

            return new WP_REST_Response([
                'success' => $refresh_result['success'],
                'data' => $refresh_result,
                'message' => $refresh_result['message']
            ], 200);

        } catch (\Exception $e) {
            return new WP_Error(
                'refresh_failed',
                'Failed to refresh data: ' . $e->getMessage(),
                ['status' => 500]
            );
        }
    }

    /**
     * Get client status for debugging
     *
     * @param WP_REST_Request $request Request object
     * @return WP_REST_Response|WP_Error Response object
     */
    public function get_client_status(WP_REST_Request $request): WP_REST_Response|WP_Error {
        try {
            $client_status = $this->analytics_manager->get_client_status();

            return new WP_REST_Response([
                'success' => true,
                'data' => $client_status,
                'message' => 'Client status retrieved successfully'
            ], 200);

        } catch (\Exception $e) {
            return new WP_Error(
                'status_failed',
                'Failed to retrieve client status: ' . $e->getMessage(),
                ['status' => 500]
            );
        }
    }

    /**
     * Get dashboard endpoint arguments
     * Following ThinkRank argument validation patterns
     *
     * @return array Endpoint arguments
     */
    private function get_dashboard_args(): array {
        return [
            'date_range' => [
                'type' => 'string',
                'default' => '30d',
                'enum' => ['7d', '30d', '90d'],
                'sanitize_callback' => 'sanitize_key',
                'description' => 'Date range for analytics data'
            ]
        ];
    }

    /**
     * Get opportunities endpoint arguments
     *
     * @return array Endpoint arguments
     */
    private function get_opportunities_args(): array {
        return [
            'date_range' => [
                'type' => 'string',
                'default' => '30d',
                'enum' => ['7d', '30d', '90d'],
                'sanitize_callback' => 'sanitize_key',
                'description' => 'Date range for opportunities analysis'
            ]
        ];
    }

    /**
     * Get setup endpoint arguments
     *
     * @return array Endpoint arguments
     */
    private function get_setup_args(): array {
        return [
            'site_url' => [
                'required' => true,
                'type' => 'string',
                'sanitize_callback' => 'esc_url_raw',
                'validate_callback' => [$this, 'validate_site_url'],
                'description' => 'Site URL to verify in Search Console'
            ]
        ];
    }

    /**
     * Validate site URL parameter
     * Following ThinkRank validation patterns
     *
     * @param string $site_url Site URL to validate
     * @return bool|WP_Error Validation result
     */
    public function validate_site_url(string $site_url): bool|WP_Error {
        if (empty($site_url)) {
            return new WP_Error(
                'invalid_site_url',
                'Site URL is required',
                ['status' => 400]
            );
        }

        if (!filter_var($site_url, FILTER_VALIDATE_URL)) {
            return new WP_Error(
                'invalid_site_url',
                'Site URL must be a valid URL',
                ['status' => 400]
            );
        }

        return true;
    }

    /**
     * Check permissions for API access
     * Following ThinkRank permission patterns
     *
     * @return bool Permission status
     */
    public function check_permissions(): bool {
        return current_user_can('manage_options');
    }

    // ========================================
    // SEO Intelligence Enhancement Endpoints
    // ========================================

    /**
     * Get intelligent dashboard data with trends and insights
     *
     * @param WP_REST_Request $request Request object
     * @return WP_REST_Response|WP_Error Response object
     */
    public function get_intelligent_dashboard(WP_REST_Request $request): WP_REST_Response|WP_Error {
        try {
            $date_range = $request->get_param('date_range');
            $intelligent_data = $this->analytics_manager->get_intelligent_dashboard_data($date_range);

            $success = isset($intelligent_data['success']) ? $intelligent_data['success'] : false;

            return new WP_REST_Response([
                'success' => $success,
                'data' => $intelligent_data['data'] ?? null,
                'message' => $intelligent_data['message'] ?? 'Intelligent dashboard data retrieved',
                'timestamp' => current_time('mysql')
            ], 200); // Always return 200 for successful API calls, even when no data available

        } catch (Exception $e) {
            return new WP_Error(
                'intelligent_dashboard_error',
                'Failed to retrieve intelligent dashboard data: ' . $e->getMessage(),
                ['status' => 500]
            );
        }
    }

    /**
     * Get intelligent SEO opportunities with prioritization
     *
     * @param WP_REST_Request $request Request object
     * @return WP_REST_Response|WP_Error Response object
     */
    public function get_intelligent_opportunities(WP_REST_Request $request): WP_REST_Response|WP_Error {
        try {
            $date_range = $request->get_param('date_range');
            $intelligent_opportunities = $this->analytics_manager->get_intelligent_seo_opportunities($date_range);

            $success = isset($intelligent_opportunities['success']) ? $intelligent_opportunities['success'] : false;

            return new WP_REST_Response([
                'success' => $success,
                'data' => $intelligent_opportunities['data'] ?? null,
                'message' => $intelligent_opportunities['message'] ?? 'Intelligent opportunities retrieved',
                'timestamp' => current_time('mysql')
            ], 200); // Always return 200 for successful API calls, even when no data available

        } catch (Exception $e) {
            return new WP_Error(
                'intelligent_opportunities_error',
                'Failed to retrieve intelligent opportunities: ' . $e->getMessage(),
                ['status' => 500]
            );
        }
    }

    /**
     * Get SEO insights
     *
     * @param WP_REST_Request $request Request object
     * @return WP_REST_Response|WP_Error Response object
     */
    public function get_seo_insights(WP_REST_Request $request): WP_REST_Response|WP_Error {
        try {
            $date_range = $request->get_param('date_range');
            $insights = $this->analytics_manager->get_seo_insights($date_range);

            $success = isset($insights['success']) ? $insights['success'] : false;

            return new WP_REST_Response([
                'success' => $success,
                'data' => $insights['data'] ?? null,
                'cached' => $insights['cached'] ?? false,
                'message' => $insights['message'] ?? 'SEO insights retrieved',
                'timestamp' => current_time('mysql')
            ], 200); // Always return 200 for successful API calls, even when no data available

        } catch (Exception $e) {
            return new WP_Error(
                'seo_insights_error',
                'Failed to retrieve SEO insights: ' . $e->getMessage(),
                ['status' => 500]
            );
        }
    }
}