<?php

declare(strict_types=1);

namespace OCA\AnalyticsHub\Controller;

use OCP\IRequest;
use OCP\IResponse;
use OCP\AppFramework\Http;
use OCP\AppFramework\Http\DataResponse;
use OCP\AppFramework\Http\JSONResponse;

use OCA\AnalyticsHub\Service\GoogleAnalyticsService;
use OCA\AnalyticsHub\Service\LLMService;
use OCA\AnalyticsHub\Service\DataProcessor;

/**
 * Admin Settings Controller
 * Handles app configuration via admin UI
 */
class AdminController {

    private GoogleAnalyticsService $gaService;
    private LLMService $llmService;
    private DataProcessor $dataProcessor;

    public function __construct(
        GoogleAnalyticsService $gaService,
        LLMService $llmService,
        DataProcessor $dataProcessor
    ) {
        $this->gaService = $gaService;
        $this->llmService = $llmService;
        $this->dataProcessor = $dataProcessor;
    }

    /**
     * Save configuration
     * POST /settings/save
     */
    public function save(IRequest $request): JSONResponse {
        $params = $request->getParams();

        // Validate required fields
        if (!isset($params['google_client_id'])) {
            return new JSONResponse([
                'success' => false,
                'error' => 'google_client_id is required'
            ], Http::STATUS_BAD_REQUEST);
        }

        if (!isset($params['google_client_secret'])) {
            return new JSONResponse([
                'success' => false,
                'error' => 'google_client_secret is required'
            ], Http::STATUS_BAD_REQUEST);
        }

        if (!isset($params['anthropic_api_key'])) {
            return new JSONResponse([
                'success' => false,
                'error' => 'anthropic_api_key is required'
            ], Http::STATUS_BAD_REQUEST);
        }

        if (!isset($params['clients_json'])) {
            return new JSONResponse([
                'success' => false,
                'error' => 'clients_json is required'
            ], Http::STATUS_BAD_REQUEST);
        }

        try {
            // Save Google OAuth config
            $this->saveConfigValue('google_client_id', $params['google_client_id']);
            $this->saveConfigValue('google_client_secret', $params['google_client_secret']);
            $this->saveConfigValue('anthropic_api_key', $params['anthropic_api_key']);

            // Save client configuration
            $clientsJson = $params['clients_json'];
            if (!json_decode($clientsJson)) {
                return new JSONResponse([
                    'success' => false,
                    'error' => 'Invalid JSON format'
                ], Http::STATUS_BAD_REQUEST);
            }

            $this->saveConfigValue('clients_json', $clientsJson);

            // Test connections
            $gaConfigured = $this->gaService->isConfigured();
            $llmConfigured = $this->llmService->isConfigured();

            return new JSONResponse([
                'success' => true,
                'data' => [
                    'google_analytics_configured' => $gaConfigured,
                    'llm_configured' => $llmConfigured,
                    'message' => 'Configuration saved successfully'
                ]
            ]);

        } catch (\Exception $e) {
            return new JSONResponse([
                'success' => false,
                'error' => $e->getMessage()
            ], Http::STATUS_INTERNAL_SERVER_ERROR);
        }
    }

    /**
     * Get configuration
     * GET /settings/load
     */
    public function load(IRequest $request): DataResponse {
        $config = [
            'google_client_id' => $this->getConfigValue('google_client_id'),
            'google_client_secret' => $this->getConfigValue('google_client_secret'),
            'anthropic_api_key' => $this->getConfigValue('anthropic_api_key'),
            'clients_json' => $this->getConfigValue('clients_json'),
        ];

        return new DataResponse([
            'success' => true,
            'data' => $config
        ]);
    }

    /**
     * Get app status
     * GET /settings/status
     */
    public function getStatus(IRequest $request): DataResponse {
        $status = [
            'app_name' => AppInfo::APP_NAME,
            'version' => AppInfo::getVersion(),
            'status' => 'operational',
            'google_analytics' => $this->gaService->isConfigured() ? 'configured' : 'not_configured',
            'llm_service' => $this->llmService->isConfigured() ? 'configured' : 'not_configured',
            'total_clients' => $this->gaService->getClientCount(),
            'last_report_time' => $this->gaService->getLastReportTime()
        ];

        return new DataResponse([
            'success' => true,
            'data' => $status
        ]);
    }

    /**
     * Helper methods
     */
    private function saveConfigValue(string $key, string $value): void {
        $this->getConfig()->setAppValue($key, $value, AppInfo::APP_NAME);
    }

    private function getConfigValue(string $key): ?string {
        return $this->getConfig()->getAppValue($key, AppInfo::APP_NAME);
    }
}