<?php

namespace App\Services\Crawler;

use Throwable;

class AiAnalyzer
{
    private ?string $apiKey;
    private string $model;

    public function __construct()
    {
        $config = require __DIR__ . '/../../../config/ai.php';
        $this->apiKey = $config['gemini']['api_key'] ?? null;
        $this->model = $config['gemini']['model'] ?? 'gemini-flash-lite-latest';
    }

    /**
     * Analyze text using Google Gemini AI to classify and extract info.
     * Returns: type, score, tags, is_opportunity, summary
     */
    public function analyze(string $title, string $description): array
    {
        if (!$this->apiKey) {
            return $this->fallbackAnalysis($title, $description);
        }

        $prompt = <<<PROMPT
You are ScoutIQ, an investor intelligence AI. Analyze the following startup/investment content and return a JSON object with:
- "type": one of ["grant", "competition", "demo_day", "event", "partnership", "investment", "news", "other"]
- "opportunity_type": one of ["vc_funding", "accelerator", "incubator", "grant", "competition", "demo_day", "event", "partnership", "other"]
- "score": integer 0-100 (relevance to startups seeking funding)
- "tags": array of relevant tags (max 5)
- "is_opportunity": boolean (true if it's a funding/investment opportunity)
- "summary": 1-2 sentence summary of what this is
- "organization_name": extracted organization name if any, or null
- "country": extracted country if any, or null

Title: {$title}
Description: {$description}

Respond ONLY with valid JSON, no markdown, no code fences.
PROMPT;

        try {
            $response = $this->callGemini($prompt);
            $json = json_decode($response, true);
            if (json_last_error() === JSON_ERROR_NONE && isset($json['type'])) {
                return $json;
            }
        } catch (Throwable $e) {
            // Fallback
        }

        return $this->fallbackAnalysis($title, $description);
    }

    /**
     * Analyze content for organization/investor extraction.
     */
    public function extractOrganization(string $text): array
    {
        if (!$this->apiKey) {
            return [
                'name' => null,
                'type' => null,
                'country' => null,
                'website' => null,
                'description' => substr($text, 0, 500),
            ];
        }

        $prompt = <<<PROMPT
Extract organization/investor information from this text. Return JSON:
- "name": organization name or null
- "type": one of ["vc", "angel", "accelerator", "incubator", "venture_studio", "partner", "other"] or null
- "country": country name or null
- "website": website URL or null
- "description": brief description max 200 chars

Text: {$text}

Respond ONLY with valid JSON.
PROMPT;

        try {
            $response = $this->callGemini($prompt);
            $json = json_decode($response, true);
            if (json_last_error() === JSON_ERROR_NONE) {
                return $json;
            }
        } catch (Throwable $e) {
            // Fallback
        }

        return [
            'name' => null,
            'type' => null,
            'country' => null,
            'website' => null,
            'description' => substr($text, 0, 500),
        ];
    }

    /**
     * Call Gemini API.
     */
    private function callGemini(string $prompt): string
    {
        $url = "https://generativelanguage.googleapis.com/v1beta/models/{$this->model}:generateContent?key={$this->apiKey}";

        $payload = json_encode([
            'contents' => [
                [
                    'parts' => [
                        ['text' => $prompt]
                    ]
                ]
            ],
            'generationConfig' => [
                'temperature' => 0.2,
                'maxOutputTokens' => 500,
            ]
        ]);

        $context = stream_context_create([
            'http' => [
                'method' => 'POST',
                'header' => "Content-Type: application/json\r\n",
                'content' => $payload,
                'timeout' => 30,
            ],
            'ssl' => [
                'verify_peer' => false,
                'verify_peer_name' => false,
            ],
        ]);

        $response = @file_get_contents($url, false, $context);
        if (!$response) {
            return '{}';
        }

        $data = json_decode($response, true);
        return $data['candidates'][0]['content']['parts'][0]['text'] ?? '{}';
    }

    /**
     * Simple keyword-based fallback when AI is unavailable.
     */
    private function fallbackAnalysis(string $title, string $description): array
    {
        $text = strtolower($title . ' ' . $description);

        $type = 'news';
        $opportunityType = 'other';
        $score = 30;
        $tags = [];
        $isOpportunity = true; // Treat all entries as opportunities by default
        $orgName = null;
        $country = null;

        // Smart Regex rules for extracting organization names from title
        if (preg_match('/^([A-Z0-9][A-Za-z0-9\s\-\.\&]{2,40})\s+(raises|launches|secures|gets|partners|funded|acquires|announces|closes|receives|seeks)\b/i', $title, $matches)) {
            $orgName = trim($matches[1]);
        } elseif (preg_match('/(backs|invests in|funds|acquires)\s+([A-Z0-9][A-Za-z0-9\s\-\.\&]{2,40})/i', $title, $matches)) {
            $orgName = trim($matches[2]);
        } elseif (preg_match('/(investment in|funding for|launch of)\s+([A-Z0-9][A-Za-z0-9\s\-\.\&]{2,40})/i', $title, $matches)) {
            $orgName = trim($matches[2]);
        }

        if ($orgName) {
            $orgName = preg_replace('/\b(series|seed|funding|round|raised|million|billion|capital|partners|ventures|inc|ltd|corp|co|llc)\b.*$/i', '', $orgName);
            $orgName = trim($orgName, " \t\n\r\0\x0B,.-");
            if (strlen($orgName) < 2 || in_array(strtolower($orgName), ['startup', 'founder', 'investor', 'program', 'new', 'why', 'how', 'what', 'who', 'the'])) {
                $orgName = null;
            }
        }

        // Keyword patterns
        if (preg_match('/\b(grant|funding|award|prize)\b/i', $text)) {
            $type = 'grant';
            $opportunityType = 'grant';
            $score = 75;
            $isOpportunity = true;
            $tags[] = 'grant';
        }
        if (preg_match('/\b(competition|contest|challenge|hackathon)\b/i', $text)) {
            $type = 'competition';
            $opportunityType = 'competition';
            $score = 65;
            $isOpportunity = true;
            $tags[] = 'competition';
        }
        if (preg_match('/\b(demo day|pitch day|investor day)\b/i', $text)) {
            $type = 'demo_day';
            $opportunityType = 'demo_day';
            $score = 60;
            $isOpportunity = true;
            $tags[] = 'demo_day';
        }
        if (preg_match('/\b(accelerator|incubator|venture studio)\b/i', $text)) {
            $opportunityType = 'accelerator';
            $score = 80;
            $isOpportunity = true;
            $tags[] = 'accelerator';
            $type = 'investment';
        }
        if (preg_match('/\b(vc|venture capital|seed fund|series [a-z])\b/i', $text)) {
            $opportunityType = 'vc_funding';
            $score = 85;
            $isOpportunity = true;
            $tags[] = 'vc_funding';
            $type = 'investment';
        }
        if (preg_match('/\b(partnership|collaboration|strategic alliance)\b/i', $text)) {
            $type = 'partnership';
            $opportunityType = 'partnership';
            $score = 50;
            $isOpportunity = true;
            $tags[] = 'partnership';
        }
        if (preg_match('/\b(conference|summit|meetup|webinar|workshop)\b/i', $text)) {
            $type = 'event';
            $opportunityType = 'event';
            $score = 40;
            $tags[] = 'event';
        }

        // Industry tags
        if (preg_match('/\b(ai|artificial intelligence|machine learning|deep learning)\b/i', $text)) {
            $tags[] = 'ai';
        }
        if (preg_match('/\b(fintech|financial technology|blockchain|crypto)\b/i', $text)) {
            $tags[] = 'fintech';
        }
        if (preg_match('/\b(saas|software|cloud)\b/i', $text)) {
            $tags[] = 'saas';
        }
        if (preg_match('/\b(mobility|transportation|ev|electric vehicle|logistics)\b/i', $text)) {
            $tags[] = 'mobility';
        }
        if (preg_match('/\b(healthtech|healthcare|biotech|medtech)\b/i', $text)) {
            $tags[] = 'healthtech';
        }
        if (preg_match('/\b(climate|cleantech|sustainability|green energy|renewable)\b/i', $text)) {
            $tags[] = 'cleantech';
        }

        $tags = array_unique($tags);

        return [
            'type' => $type,
            'opportunity_type' => $opportunityType,
            'score' => $score,
            'tags' => $tags,
            'is_opportunity' => $isOpportunity,
            'summary' => substr($description, 0, 200),
            'organization_name' => $orgName,
            'country' => $country,
        ];
    }
}