<?php

declare(strict_types=1);

namespace OCA\AnalyticsHub\Controller;

use OCP\IRequest;
use OCP\AppFramework\Http;

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

/**
 * Report Controller - Internal report generation logic
 */
class ReportController {

    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;
    }

    /**
     * Generate report for a specific client
     * Called by cron job
     */
    public function generateForClient(ClientConfig $client): ?string {
        \OCP\Util::writeLog("Generating report for: {$client->getName()}");

        try {
            // Fetch GA4 data (last 7 days)
            $rawData = $this->gaService->fetchGA4Data($client, '7d');

            // Process and validate
            $processed = $this->dataProcessor->process($rawData, $client);

            // Generate report via LLM
            $markdown = $this->llmService->generate($processed, $client);

            // Save to Nextcloud
            $report = $this->gaService->saveReport($client, $markdown);

            \OCP\Util::writeLog("Report generated: {$report->getFilePath()}");

            return $markdown;

        } catch (\Exception $e) {
            \OCP\Util::writeLog("Report generation failed for {$client->getName()}: {$e->getMessage()}");
            throw $e;
        }
    }

    /**
     * Generate reports for all active clients
     * Called by cron job
     */
    public function generateForAllClients(): array {
        $clients = $this->gaService->getActiveClients();
        $results = [];

        foreach ($clients as $client) {
            try {
                $this->generateForClient($client);
                $results[$client->getSlug()] = 'success';
            } catch (\Exception $e) {
                $results[$client->getSlug()] = "error: {$e->getMessage()}";
            }
        }

        return $results;
    }
}