<?php

namespace App\Services\Crawler;

use App\Services\Database\Connection;
use App\Services\Database\ActivityLogger;
use PDO;
use Throwable;

class Collector
{
    private PDO $pdo;
    private RssParser $rssParser;
    private AiAnalyzer $aiAnalyzer;
    private ActivityLogger $logger;

    public function __construct(
        Connection $connection,
        RssParser $rssParser,
        AiAnalyzer $aiAnalyzer,
        ActivityLogger $logger
    ) {
        $this->pdo = $connection->getPdo();
        $this->rssParser = $rssParser;
        $this->aiAnalyzer = $aiAnalyzer;
        $this->logger = $logger;
    }

    /**
     * Collect from all active sources.
     */
    public function collectAll(): array
    {
        $results = [
            'total_sources' => 0,
            'processed' => 0,
            'errors' => 0,
            'new_opportunities' => 0,
            'new_organizations' => 0,
            'details' => [],
        ];

        $sources = $this->getActiveSources();

        foreach ($sources as $source) {
            $results['total_sources']++;
            try {
                $result = $this->collectSource($source);
                $results['processed']++;
                $results['new_opportunities'] += $result['opportunities'];
                $results['new_organizations'] += $result['organizations'];
                $results['details'][] = [
                    'source' => $source['name'],
                    'type' => $source['type'],
                    'status' => 'success',
                    'entries_found' => $result['entries_found'],
                    'new_opportunities' => $result['opportunities'],
                    'new_organizations' => $result['organizations'],
                ];
            } catch (Throwable $e) {
                $results['errors']++;
                $results['details'][] = [
                    'source' => $source['name'],
                    'type' => $source['type'],
                    'status' => 'error',
                    'error' => $e->getMessage(),
                ];
            }
        }

        $this->logger->log(null, 'collector_run', 'Collector completed: ' . json_encode([
            'total_sources' => $results['total_sources'],
            'processed' => $results['processed'],
            'errors' => $results['errors'],
            'new_opportunities' => $results['new_opportunities'],
            'new_organizations' => $results['new_organizations'],
        ]));

        return $results;
    }

    /**
     * Collect from a single source.
     */
    public function collectSource(array $source): array
    {
        $result = [
            'entries_found' => 0,
            'opportunities' => 0,
            'organizations' => 0,
        ];

        if ($source['type'] === 'rss') {
            $entries = $this->rssParser->fetchEntries($source['url']);
            $result['entries_found'] = count($entries);

            foreach ($entries as $entry) {
                $this->processEntry($entry, $source, $result);
            }
        }

        return $result;
    }

    /**
     * Process a single entry: analyze, save opportunity, save organization.
     */
    private function processEntry(array $entry, array $source, array &$result): void
    {
        // Skip if already exists
        if ($this->rssParser->entryExists($entry['url'])) {
            return;
        }

        // AI Analysis
        $analysis = $this->aiAnalyzer->analyze($entry['title'], $entry['description']);

        // Extract organization if any
        $orgId = null;
        if (!empty($analysis['organization_name'])) {
            $orgId = $this->rssParser->organizationExists($analysis['organization_name']);
        }

        // If no org found and AI suggests one, try to extract more details
        if (!$orgId && !empty($analysis['organization_name'])) {
            $orgData = $this->aiAnalyzer->extractOrganization($entry['title'] . ' ' . $entry['description']);
            if (!empty($orgData['name'])) {
                $orgId = $this->createOrganization($orgData);
                if ($orgId) {
                    $result['organizations']++;
                }
            }
        }

        // Create opportunity
        $this->createOpportunity($entry, $analysis, $orgId, $source);
        $result['opportunities']++;
    }

    /**
     * Create an organization record.
     */
    private function createOrganization(array $data): ?int
    {
        try {
            $stmt = $this->pdo->prepare(
                "INSERT INTO organizations (name, description, type, country, website_url, crm_status) 
                 VALUES (?, ?, ?, ?, ?, 'New')"
            );
            $stmt->execute([
                $data['name'],
                $data['description'] ?? '',
                $data['type'] ?? 'partner',
                $data['country'] ?? null,
                $data['website'] ?? null,
            ]);
            return (int)$this->pdo->lastInsertId();
        } catch (Throwable $e) {
            return null;
        }
    }

    /**
     * Create an opportunity record.
     */
    private function createOpportunity(array $entry, array $analysis, ?int $orgId, array $source): void
    {
        try {
            $score = min(100, max(0, $analysis['score'] ?? 10));

            $stmt = $this->pdo->prepare(
                "INSERT INTO opportunities (title, description, type, organization_id, url, status, score, raw_data) 
                 VALUES (?, ?, ?, ?, ?, 'active', ?, ?)"
            );
            $stmt->execute([
                $entry['title'],
                $analysis['summary'] ?? $entry['description'],
                $analysis['opportunity_type'] ?? $analysis['type'] ?? 'other',
                $orgId,
                $entry['url'],
                $score,
                json_encode([
                    'source_id' => $source['id'] ?? null,
                    'source_name' => $source['name'] ?? '',
                    'published_at' => $entry['published_at'],
                    'categories' => $entry['categories'] ?? [],
                    'analysis' => $analysis,
                ]),
            ]);

            $opportunityId = (int)$this->pdo->lastInsertId();

            // Save tags
            if (!empty($analysis['tags'])) {
                foreach ($analysis['tags'] as $tagName) {
                    $tagId = $this->getOrCreateTag($tagName);
                    if ($tagId) {
                        $stmt = $this->pdo->prepare(
                            "INSERT IGNORE INTO opportunity_tags (opportunity_id, tag_id) VALUES (?, ?)"
                        );
                        $stmt->execute([$opportunityId, $tagId]);
                    }
                }
            }

        } catch (Throwable $e) {
            // Log but don't fail
        }
    }

    /**
     * Get or create a tag.
     */
    private function getOrCreateTag(string $name): ?int
    {
        $slug = strtolower(preg_replace('/[^a-z0-9]+/', '-', $name));
        $slug = trim($slug, '-');

        $stmt = $this->pdo->prepare("SELECT id FROM tags WHERE slug = ?");
        $stmt->execute([$slug]);
        $id = $stmt->fetchColumn();
        if ($id) {
            return (int)$id;
        }

        try {
            $stmt = $this->pdo->prepare("INSERT INTO tags (name, slug) VALUES (?, ?)");
            $stmt->execute([$name, $slug]);
            return (int)$this->pdo->lastInsertId();
        } catch (Throwable $e) {
            return null;
        }
    }

    /**
     * Get all active sources.
     */
    public function getActiveSources(): array
    {
        $stmt = $this->pdo->query(
            "SELECT s.*, GROUP_CONCAT(sc.category) as categories 
             FROM sources s 
             LEFT JOIN source_categories sc ON sc.source_id = s.id 
             WHERE s.status = 'active' 
             GROUP BY s.id"
        );
        return $stmt->fetchAll() ?: [];
    }
}