<?php

namespace App\Http\Controllers;

use App\Jobs\CompressVideoJob;
use App\Mail\VideoUploaded;
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']);
    }

    public function index()
    {
        $videos = Video::public()->latest()->paginate(12);
        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()
            ->paginate(12);
        
        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(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']);
        
        // 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'));
    }

    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);
    }
}