<?php

namespace App\Http\Controllers\Frontend;

use App\Http\Controllers\Controller;
use App\Models\Anime;
use App\Models\Genre;
use App\Models\Analytics\AiQuery;
use App\Services\DeepSeekService;
use Illuminate\Http\Request;

class AiController extends Controller
{
    /**
     * AI Hub sayfası — kişisel öneri + doğal dil arama.
     */
    public function index()
    {
        $genres = Genre::orderBy('name')->get(['id', 'name']);
        return view('frontend.ai.index', compact('genres'));
    }

    /**
     * POST /ai/chat — sohbet turu.
     * Body: { messages: [{role, content}, ...] }
     */
    public function chat(Request $request)
    {
        $ai = new DeepSeekService();
        if (!$ai->isConfigured()) {
            return response()->json(['error' => 'AI servisi şu an kullanılamıyor.'], 503);
        }

        $messages = $request->input('messages', []);
        if (empty($messages)) {
            return response()->json(['error' => 'Mesaj boş.'], 422);
        }

        // Validate structure
        $messages = array_filter($messages, fn($m) => isset($m['role'], $m['content']) && in_array($m['role'], ['user', 'assistant']));
        $messages = array_values($messages);

        $context = $ai->getAnimeContext();

        // Sayfa bağlamı — kullanıcı anime/player sayfasındaysa AI'ya söyle
        $pageCtx = trim($request->input('page_context', ''));
        if ($pageCtx) {
            $context .= "\n\n== KULLANICI ŞU AN BU SAYFADA ==\n{$pageCtx}";
        }

        $rawReply = $ai->chat($messages, $context);

        if (!$rawReply) {
            return response()->json(['error' => 'AI yanıt vermedi, tekrar dene.'], 500);
        }

        // [SUGGEST:id1,id2,id3] satırını parse et
        $animeCards = [];
        $cleanReply = $rawReply;
        if (preg_match('/\[SUGGEST:([\d,\s]+)\]\s*$/m', $rawReply, $m)) {
            $cleanReply = trim(str_replace($m[0], '', $rawReply));
            $ids = array_filter(array_map('intval', explode(',', $m[1])));
            if ($ids) {
                $animes = Anime::whereIn('id', $ids)
                    ->where('is_published', true)
                    ->with('genres:id,name')
                    ->get(['id', 'title', 'slug', 'cover_image', 'rating', 'type', 'episode_count']);
                $animeMap = $animes->keyBy('id');
                foreach ($ids as $id) {
                    if ($a = $animeMap[$id] ?? null) {
                        $animeCards[] = [
                            'id'            => $a->id,
                            'title'         => $a->title,
                            'slug'          => $a->slug,
                            'cover'         => $a->cover_url,
                            'rating'        => $a->rating,
                            'type'          => $a->type,
                            'episode_count' => $a->episode_count,
                            'genres'        => $a->genres->pluck('name')->take(3)->join(', '),
                        ];
                    }
                }
            }
        }

        // Log
        $lastUser = collect($messages)->last(fn($m) => $m['role'] === 'user');
        AiQuery::create(['user_id'=>auth()->id(),'query_type'=>'chat','query_text'=>substr($lastUser['content']??'',0,500),'created_at'=>now()]);

        return response()->json(['reply' => $cleanReply, 'anime_cards' => $animeCards]);
    }

    /**
     * POST /ai/recommend — kişisel öneri.
     * Body: { mood?, genres[]?, type? }
     */
    public function recommend(Request $request)
    {
        $ai = new DeepSeekService();
        if (!$ai->isConfigured()) {
            return response()->json(['error' => 'AI servisi şu an kullanılamıyor.'], 503);
        }

        $mood   = trim($request->input('mood', ''));
        $genres = $request->input('genres', []);
        $type   = $request->input('type', '');

        $prefs = [];
        if ($mood)   $prefs[] = "Ruh hali / tema: {$mood}";
        if ($genres) $prefs[] = 'Tercih edilen türler: ' . implode(', ', array_slice((array)$genres, 0, 6));
        if ($type)   $prefs[] = 'İçerik tipi: ' . ($type === 'movie' ? 'Film' : 'Dizi');
        $prefStr = $prefs ? implode("\n", $prefs) : 'Genel tavsiye, en beğenilen animeler';

        $animes = Anime::where('is_published', true)
            ->with('genres:id,name')
            ->get(['id', 'title', 'slug', 'type', 'status', 'rating', 'release_year', 'cover_image', 'episode_count']);

        $result = $ai->recommend($prefStr, $animes->toArray());

        if (!$result) {
            return response()->json(['error' => 'Öneri üretilemedi.'], 500);
        }

        $animeMap = $animes->keyBy('id');
        $recs = array_values(array_filter(array_map(function ($item) use ($animeMap) {
            $anime = $animeMap[$item['id'] ?? 0] ?? null;
            if (!$anime) return null;
            return [
                'id'            => $anime->id,
                'title'         => $anime->title,
                'slug'          => $anime->slug,
                'cover'         => $anime->cover_url,
                'rating'        => $anime->rating,
                'type'          => $anime->type,
                'episode_count' => $anime->episode_count,
                'reason'        => $item['reason'] ?? '',
            ];
        }, $result)));

        AiQuery::create(['user_id'=>auth()->id(),'query_type'=>'recommend','query_text'=>substr($prefStr,0,500),'created_at'=>now()]);

        return response()->json(['recommendations' => $recs]);
    }

    /**
     * POST /ai/search — doğal dil ile anime ara.
     * Body: { query }
     */
    public function search(Request $request)
    {
        $query = trim($request->input('query', ''));
        if (!$query) {
            return response()->json(['error' => 'Sorgu boş.'], 422);
        }

        $ai = new DeepSeekService();
        if (!$ai->isConfigured()) {
            return response()->json(['error' => 'AI servisi şu an kullanılamıyor.'], 503);
        }

        $animes = Anime::where('is_published', true)
            ->with('genres:id,name')
            ->get(['id', 'title', 'slug', 'type', 'rating', 'release_year', 'cover_image']);

        $ids = $ai->naturalSearch($query, $animes->toArray());
        if (!$ids) {
            return response()->json(['results' => []]);
        }

        $animeMap = $animes->keyBy('id');
        $results = array_values(array_filter(array_map(function ($id) use ($animeMap) {
            $anime = $animeMap[(int)$id] ?? null;
            if (!$anime) return null;
            return [
                'id'     => $anime->id,
                'title'  => $anime->title,
                'slug'   => $anime->slug,
                'cover'  => $anime->cover_url,
                'rating' => $anime->rating,
                'type'   => $anime->type,
            ];
        }, $ids)));

        AiQuery::create(['user_id'=>auth()->id(),'query_type'=>'search','query_text'=>substr($query,0,500),'created_at'=>now()]);

        return response()->json(['results' => $results]);
    }

    /**
     * POST /ai/episode-info — bölüm hakkında AI analizi.
     * Body: { anime_title, episode_number, episode_title?, description? }
     */
    public function episodeInfo(Request $request)
    {
        $ai = new DeepSeekService();
        if (!$ai->isConfigured()) {
            return response()->json(['error' => 'AI servisi şu an kullanılamıyor.'], 503);
        }

        $animeTitle    = trim($request->input('anime_title', ''));
        $episodeNumber = (int) $request->input('episode_number', 1);
        $episodeTitle  = trim($request->input('episode_title', ''));
        $description   = trim($request->input('description', ''));

        if (!$animeTitle) {
            return response()->json(['error' => 'Anime adı gerekli.'], 422);
        }

        $info = $ai->episodeInfo($animeTitle, $episodeNumber, $episodeTitle, $description);
        if (!$info) {
            return response()->json(['error' => 'Analiz yapılamadı.'], 500);
        }

        AiQuery::create(['user_id'=>auth()->id(),'query_type'=>'episode_info','query_text'=>"{$animeTitle} E{$episodeNumber}",'created_at'=>now()]);

        return response()->json(['info' => $info]);
    }

    /**
     * POST /ai/similar — benzer animeler.
     * Body: { anime_id }
     */
    public function similar(Request $request)
    {
        $ai = new DeepSeekService();
        if (!$ai->isConfigured()) {
            return response()->json(['error' => 'AI servisi şu an kullanılamıyor.'], 503);
        }

        $anime = Anime::with('genres:id,name')->find($request->input('anime_id'));
        if (!$anime) {
            return response()->json(['error' => 'Anime bulunamadı.'], 404);
        }

        $genres    = $anime->genres->pluck('name')->join(', ');
        $prefStr   = "Şu anime ile benzer: {$anime->title}\n"
                   . "Türler: {$genres}\n"
                   . "Tip: " . ($anime->type === 'movie' ? 'Film' : 'Dizi') . "\n"
                   . "Bu animeyi beğenen izleyicilere benzer içerik öner. Aynı animeyi önerme!";

        $animes = Anime::where('is_published', true)
            ->where('id', '!=', $anime->id)
            ->with('genres:id,name')
            ->get(['id', 'title', 'slug', 'type', 'rating', 'release_year', 'cover_image']);

        $result = $ai->recommend($prefStr, $animes->toArray());
        if (!$result) {
            return response()->json(['similar' => []]);
        }

        $animeMap = $animes->keyBy('id');
        $similar = array_values(array_filter(array_map(function ($item) use ($animeMap) {
            $a = $animeMap[$item['id'] ?? 0] ?? null;
            if (!$a) return null;
            return [
                'id'     => $a->id,
                'title'  => $a->title,
                'slug'   => $a->slug,
                'cover'  => $a->cover_url,
                'rating' => $a->rating,
                'type'   => $a->type,
                'reason' => $item['reason'] ?? '',
            ];
        }, $result)));

        AiQuery::create(['user_id'=>auth()->id(),'query_type'=>'similar','query_text'=>$anime->title,'created_at'=>now()]);

        return response()->json(['similar' => $similar]);
    }
}