<?php

namespace App\Http\Controllers;

use App\Jobs\CompressVideoJob;
use App\Mail\VideoUploaded;
use App\Models\Playlist;
use App\Models\Video;
use FFMpeg\FFMpeg;
use FFMpeg\FFProbe;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Mail;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;

class VideoController extends Controller
{
    public function __construct()
    {
        $this->middleware('auth')->except(['index', 'show', 'search', 'stream', 'trending', 'shorts']);
    }

    public function index()
    {
        $videos = Video::public()->latest()->get();

        return view('videos.index', compact('videos'));
    }

    public function search(Request $request)
    {
        $query = $request->get('q', '');

        if (empty($query)) {
            return redirect()->route('videos.index');
        }

        $videos = Video::public()
            ->where(function ($q) use ($query) {
                $q->where('title', 'like', "%{$query}%")
                    ->orWhere('description', 'like', "%{$query}%");
            })
            ->latest()
            ->get();

        return view('videos.index', compact('videos', 'query'));
    }

    public function create()
    {
        return view('videos.create');
    }

    public function store(Request $request)
    {
        $request->validate([
            'title' => 'required|string|max:255',
            'description' => 'nullable|string',
            'video' => 'required|file|mimes:mp4,webm,ogg,mov,avi,wmv,flv,mkv|max:512000',
            'thumbnail' => 'nullable|image|mimes:jpg,jpeg,png,webp|max:5120',
            'visibility' => 'nullable|in:public,unlisted,private',
            'type' => 'nullable|in:generic,music,match',
        ]);

        $videoFile = $request->file('video');
        $filename = Str::slug($request->title).'-'.time().'.'.$videoFile->getClientOriginalExtension();
        $path = $videoFile->storeAs('public/videos', $filename);

        // Get file info
        $fileSize = $videoFile->getSize();
        $mimeType = $videoFile->getMimeType();

        $thumbnailPath = null;
        if ($request->hasFile('thumbnail')) {
            $thumbFilename = Str::uuid().'.'.$request->file('thumbnail')->getClientOriginalExtension();
            $thumbnailPath = $request->file('thumbnail')->storeAs('public/thumbnails', $thumbFilename);
        } else {
            // Extract thumbnail from video using FFmpeg
            try {
                $ffmpeg = FFMpeg::create();
                $videoPath = storage_path('app/'.$path);

                if (file_exists($videoPath)) {
                    $video = $ffmpeg->open($videoPath);
                    $frame = $video->frame(\FFMpeg\Coordinate\TimeCode::fromSeconds(1));

                    $thumbFilename = Str::uuid().'.jpg';
                    $thumbFullPath = storage_path('app/public/thumbnails/'.$thumbFilename);

                    // Ensure thumbnails directory exists
                    if (! file_exists(storage_path('app/public/thumbnails'))) {
                        mkdir(storage_path('app/public/thumbnails'), 0755, true);
                    }

                    $frame->save($thumbFullPath);
                    $thumbnailPath = 'public/thumbnails/'.$thumbFilename;
                }
            } catch (\Exception $e) {
                // Log the error but don't fail the upload
                \Log::error('FFmpeg failed to extract thumbnail: '.$e->getMessage());
            }
        }

        // Get video dimensions and detect orientation using FFmpeg
        $width = null;
        $height = null;
        $orientation = 'landscape';

        try {
            $ffprobe = FFProbe::create();
            $videoPath = storage_path('app/'.$path);

            if (file_exists($videoPath)) {
                $streams = $ffprobe->streams($videoPath);
                $videoStream = $streams->videos()->first();

                if ($videoStream) {
                    $width = $videoStream->get('width');
                    $height = $videoStream->get('height');

                    // Auto-detect orientation based on dimensions
                    if ($width && $height) {
                        if ($height > $width) {
                            $orientation = 'portrait';
                        } elseif ($width > $height) {
                            $orientation = 'landscape';
                        } else {
                            $orientation = 'square';
                        }
                    }
                }
            }
        } catch (\Exception $e) {
            // Log the error but don't fail the upload
            \Log::error('FFprobe failed to get video dimensions: '.$e->getMessage());
            // Use default orientation
        }

        $video = Video::create([
            'user_id' => Auth::id(),
            'title' => $request->title,
            'description' => $request->description,
            'filename' => $filename,
            'path' => $path,
            'thumbnail' => $thumbnailPath ? basename($thumbnailPath) : null,
            'size' => $fileSize,
            'mime_type' => $mimeType,
            'orientation' => $orientation,
            'width' => $width,
            'height' => $height,
            'status' => 'processing',
            'visibility' => $request->visibility ?? 'public',
            'type' => $request->type ?? 'generic',
        ]);

        // Dispatch compression job in the background
        CompressVideoJob::dispatch($video);

        // Load user relationship for email
        $video->load('user');

        // Send email notification
        try {
            Mail::to(Auth::user()->email)->send(new VideoUploaded($video, Auth::user()->name));
        } catch (\Exception $e) {
            // Log the error but don't fail the upload
            \Log::error('Email notification failed: '.$e->getMessage());
        }

        return response()->json([
            'success' => true,
            'redirect' => route('videos.show', $video->id),
        ]);
    }

    public function show(Request $request, Video $video)
    {
        // Check if user can view this video
        if (! $video->canView(Auth::user())) {
            abort(404, 'Video not found');
        }

        // Track view if user is logged in
        if (Auth::check()) {
            $user = Auth::user();
            // Add view if not already viewed recently (within last hour)
            $existingView = \DB::table('video_views')
                ->where('user_id', $user->id)
                ->where('video_id', $video->id)
                ->where('watched_at', '>', now()->subHour())
                ->first();

            if (! $existingView) {
                \DB::table('video_views')->insert([
                    'user_id' => $user->id,
                    'video_id' => $video->id,
                    'watched_at' => now(),
                ]);
            }
        }

        // Load comments with user relationship
        $video->load(['comments.user', 'comments.replies.user', 'matchRounds.points', 'coachReviews']);

        // Handle playlist navigation if playlist parameter is provided
        $playlist = null;
        $nextVideo = null;
        $previousVideo = null;
        $playlistVideos = null;

        $playlistId = $request->query('playlist');
        if ($playlistId) {
            $playlist = Playlist::find($playlistId);
            if ($playlist && $playlist->canView(Auth::user())) {
                $nextVideo = $playlist->getNextVideo($video);
                $previousVideo = $playlist->getPreviousVideo($video);
                $playlistVideos = $playlist->videos;
            }
        }

        // Get recommended videos (exclude current video)
        $recommendedVideos = Video::public()
            ->where('id', '!=', $video->id)
            ->latest()
            ->limit(20)
            ->get();

        // Render the appropriate view based on video type
        $view = match ($video->type) {
            'match' => 'videos.types.match',
            'music' => 'videos.types.music',
            default => 'videos.types.generic',
        };

        return view($view, compact('video', 'playlist', 'nextVideo', 'previousVideo', 'recommendedVideos', 'playlistVideos'));
    }

    public function matchData(Video $video)
    {
        if (! $video->canView(Auth::user())) {
            abort(403);
        }

        return response()->json([
            'success' => true,
            'rounds' => $video->matchRounds()->with('points')->orderBy('round_number')->get(),
            'reviews' => $video->coachReviews()->orderBy('start_time_seconds')->get(),
        ]);
    }

    public function edit(Video $video, Request $request)
    {
        // Check if user owns the video
        if (Auth::id() !== $video->user_id) {
            abort(403, 'You do not have permission to edit this video.');
        }

        // If not AJAX request, redirect to show page with edit parameter
        if (! $request->expectsJson() && ! $request->ajax()) {
            return redirect()->route('videos.show', $video->id)->with('openEditModal', true);
        }

        // For AJAX request, return JSON
        return response()->json([
            'success' => true,
            'video' => [
                'id' => $video->id,
                'title' => $video->title,
                'description' => $video->description,
                'thumbnail' => $video->thumbnail,
                'thumbnail_url' => $video->thumbnail ? asset('storage/thumbnails/'.$video->thumbnail) : null,
                'visibility' => $video->visibility ?? 'public',
                'type' => $video->type ?? 'generic',
            ],
        ]);
    }

    public function update(Request $request, Video $video)
    {
        // Check if user owns the video
        if (Auth::id() !== $video->user_id) {
            abort(403, 'You do not have permission to edit this video.');
        }

        $request->validate([
            'title' => 'required|string|max:255',
            'description' => 'nullable|string',
            'thumbnail' => 'nullable|image|mimes:jpg,jpeg,png,webp|max:5120',
            'visibility' => 'nullable|in:public,unlisted,private',
            'type' => 'nullable|in:generic,music,match',
        ]);

        $data = $request->only(['title', 'description', 'visibility', 'type']);

        if ($request->hasFile('thumbnail')) {
            if ($video->thumbnail) {
                Storage::delete('public/thumbnails/'.$video->thumbnail);
            }
            $thumbFilename = Str::uuid().'.'.$request->file('thumbnail')->getClientOriginalExtension();
            $data['thumbnail'] = $request->file('thumbnail')->storeAs('public/thumbnails', $thumbFilename);
            $data['thumbnail'] = basename($data['thumbnail']);
        }

        // Set default visibility if not provided
        if (! isset($data['visibility'])) {
            unset($data['visibility']);
        }

        $video->update($data);

        // Return JSON for AJAX requests
        if ($request->expectsJson() || $request->ajax()) {
            return response()->json([
                'success' => true,
                'message' => 'Video updated successfully!',
                'video' => [
                    'id' => $video->id,
                    'title' => $video->title,
                    'description' => $video->description,
                    'visibility' => $video->visibility,
                ],
            ]);
        }

        return redirect()->route('videos.show', $video)->with('success', 'Video updated!');
    }

    public function destroy(Request $request, Video $video)
    {
        // Check if user owns the video
        if (Auth::id() !== $video->user_id) {
            abort(403, 'You do not have permission to delete this video.');
        }

        $videoTitle = $video->title;

        Storage::delete('public/videos/'.$video->filename);
        if ($video->thumbnail) {
            Storage::delete('public/thumbnails/'.$video->thumbnail);
        }
        $video->delete();

        // Return JSON for AJAX requests
        if ($request->expectsJson() || $request->ajax()) {
            return response()->json([
                'success' => true,
                'message' => 'Video deleted successfully!',
            ]);
        }

        return redirect()->route('videos.index')->with('success', 'Video deleted!');
    }

    public function stream(Video $video)
    {
        // Check if user can view this video
        if (! $video->canView(Auth::user())) {
            abort(404, 'Video not found');
        }

        $path = storage_path('app/public/videos/'.$video->filename);

        if (! file_exists($path)) {
            abort(404, 'Video file not found');
        }

        $fileSize = filesize($path);
        $mimeType = $video->mime_type ?: 'video/mp4';

        $handle = fopen($path, 'rb');
        if (! $handle) {
            abort(500, 'Cannot open video file');
        }

        $range = request()->header('Range');

        if ($range) {
            // Parse range header
            preg_match('/bytes=(\d+)-(\d*)/', $range, $matches);
            $start = intval($matches[1] ?? 0);
            $end = $matches[2] ? intval($matches[2]) : $fileSize - 1;

            $length = $end - $start + 1;

            header('HTTP/1.1 206 Partial Content');
            header('Content-Type: '.$mimeType);
            header('Content-Length: '.$length);
            header('Content-Range: bytes '.$start.'-'.$end.'/'.$fileSize);
            header('Accept-Ranges: bytes');
            header('Cache-Control: public, max-age=3600');

            fseek($handle, $start);
            $chunkSize = 8192;
            $bytesToRead = $length;

            while (! feof($handle) && $bytesToRead > 0) {
                $buffer = fread($handle, min($chunkSize, $bytesToRead));
                echo $buffer;
                flush();
                $bytesToRead -= strlen($buffer);
            }

            fclose($handle);
            exit;
        } else {
            // No range requested, stream entire file
            header('Content-Type: '.$mimeType);
            header('Content-Length: '.$fileSize);
            header('Accept-Ranges: bytes');
            header('Cache-Control: public, max-age=3600');

            fpassthru($handle);
            fclose($handle);
            exit;
        }
    }

    public function download(Video $video)
    {
        // Check if user can view this video
        if (! $video->canView(Auth::user())) {
            abort(404, 'Video not found');
        }

        $path = storage_path('app/public/videos/'.$video->filename);

        if (! file_exists($path)) {
            abort(404, 'Video file not found');
        }

        $filename = $video->title.'.'.pathinfo($video->filename, PATHINFO_EXTENSION);

        return response()->download($path, $filename);
    }

    // Trending videos page
    public function trending(Request $request)
    {
        $hours = $request->get('hours', 48); // Default: 48 hours
        $limit = $request->get('limit', 50);

        // Validate parameters
        $hours = min(max($hours, 24), 168); // Between 24h and 7 days
        $limit = min(max($limit, 10), 100);

        // Get all public ready videos first
        $videos = Video::public()
            ->where('status', 'ready')
            ->where('created_at', '>=', now()->subDays(10))
            ->with('user')
            ->get();

        // Calculate trending score for each video
        $videos = $videos->map(function ($video) use ($hours) {
            $recentViews = \DB::table('video_views')
                ->where('video_id', $video->id)
                ->where('watched_at', '>=', now()->subHours($hours))
                ->count();

            $likeCount = \DB::table('video_likes')
                ->where('video_id', $video->id)
                ->count();

            // Calculate age in hours
            $ageHours = $video->created_at->diffInHours(now());

            // Calculate trending score
            // 70% recent views, 15% velocity, 10% recency, 5% likes
            $velocity = $recentViews / $hours;
            $recencyBonus = max(0, 1 - ($ageHours / 240));

            $score = ($recentViews * 0.70) +
                     ($velocity * 100 * 0.15) +
                     ($recencyBonus * 50 * 0.10) +
                     ($likeCount * 0.1 * 0.05);

            $video->trending_score = round($score, 2);
            $video->view_count = $recentViews;
            $video->like_count = $likeCount;

            return $video;
        });

        // Filter and sort by trending score
        $trendingVideos = $videos
            ->filter(fn ($v) => $v->trending_score > 0)
            ->sortByDesc('trending_score')
            ->take($limit)
            ->values();

        return view('videos.trending', [
            'videos' => $trendingVideos,
            'hours' => $hours,
            'limit' => $limit,
        ]);
    }

    // Shorts page
    public function shorts(Request $request)
    {
        $videos = Video::public()
            ->where('is_shorts', true)
            ->where('status', 'ready')
            ->with('user')
            ->latest()
            ->get();

        return view('videos.shorts', compact('videos'));
    }
}