backend\app.py

from flask import Flask, request, jsonify, send_file
from flask_cors import CORS
import os
import cv2
import numpy as np
from PIL import Image
import moviepy.editor as mp
from werkzeug.utils import secure_filename
import tempfile
import uuid
import json
from .video_processor import VideoProcessor  # Fixed relative import

def process_video(video_path, progress_callback=None):
    """
    Process a video file and return the result.
    This function is used by both Flask API and Gradio interface.
    """
    try:
        # Initialize video processor
        processor = VideoProcessor()
        
        # Generate output filename
        input_filename = os.path.basename(video_path)
        output_filename = f"vr180_{input_filename}"
        output_path = os.path.join(OUTPUT_FOLDER, output_filename)
        
        # Process video
        if progress_callback:
            progress_callback(0.2, desc="Initializing video processing...")
        
        result = processor.process_video(video_path, output_path, progress_callback)
        
        if result['success']:
            if progress_callback:
                progress_callback(1.0, desc="Processing complete!")
            return {
                'success': True,
                'output_path': output_path,
                'output_filename': output_filename,
                'message': 'Video processed successfully',
                'processing_time': result.get('processing_time', 0)
            }
        else:
            return {
                'success': False,
                'error': result.get('error', 'Processing failed')
            }
    
    except Exception as e:
        return {
            'success': False,
            'error': f'Error processing video: {str(e)}'
        }

app = Flask(__name__)
CORS(app)

# Configuration
UPLOAD_FOLDER = 'uploads'
OUTPUT_FOLDER = 'outputs'
ALLOWED_EXTENSIONS = {'mp4', 'avi', 'mov', 'mkv', 'webm'}

# Create directories
os.makedirs(UPLOAD_FOLDER, exist_ok=True)
os.makedirs(OUTPUT_FOLDER, exist_ok=True)

app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
app.config['OUTPUT_FOLDER'] = OUTPUT_FOLDER
app.config['MAX_CONTENT_LENGTH'] = 500 * 1024 * 1024  # 500MB max file size

def allowed_file(filename):
    return '.' in filename and filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS

@app.route('/api/health', methods=['GET'])
def health_check():
    return jsonify({'status': 'healthy', 'message': 'VR180 Converter API is running'})

@app.route('/api/upload', methods=['POST'])
def upload_video():
    if 'video' not in request.files:
        return jsonify({'error': 'No video file provided'}), 400
    
    file = request.files['video']
    if file.filename == '':
        return jsonify({'error': 'No file selected'}), 400
    
    if not allowed_file(file.filename):
        return jsonify({'error': 'Invalid file type. Please upload MP4, AVI, MOV, MKV, or WebM'}), 400
    
    # Generate unique filename
    filename = secure_filename(file.filename)
    unique_filename = f"{uuid.uuid4()}_{filename}"
    filepath = os.path.join(app.config['UPLOAD_FOLDER'], unique_filename)
    
    try:
        file.save(filepath)
        
        # Get video info
        video = mp.VideoFileClip(filepath)
        duration = video.duration
        fps = video.fps
        size = video.size
        
        video.close()
        
        return jsonify({
            'success': True,
            'filename': unique_filename,
            'original_name': filename,
            'duration': duration,
            'fps': fps,
            'size': size
        })
    
    except Exception as e:
        return jsonify({'error': f'Error processing file: {str(e)}'}), 500

@app.route('/api/process', methods=['POST'])
def process_video_api():
    data = request.get_json()
    filename = data.get('filename')
    
    if not filename:
        return jsonify({'error': 'No filename provided'}), 400
    
    filepath = os.path.join(app.config['UPLOAD_FOLDER'], filename)
    
    if not os.path.exists(filepath):
        return jsonify({'error': 'File not found'}), 404
    
    # Use the shared process_video function
    result = process_video(filepath)
    
    if result['success']:
        return jsonify(result)
    else:
        return jsonify({'error': result.get('error', 'Processing failed')}), 500

@app.route('/api/download/<filename>')
def download_video(filename):
    filepath = os.path.join(app.config['OUTPUT_FOLDER'], filename)
    
    if not os.path.exists(filepath):
        return jsonify({'error': 'File not found'}), 404
    
    return send_file(filepath, as_attachment=True)

@app.route('/api/status/<filename>')
def get_processing_status(filename):
    # This would be implemented with a proper job queue in production
    # For now, we'll return a simple status
    return jsonify({
        'status': 'completed',
        'progress': 100
    })

if __name__ == '__main__':
    app.run(debug=True, host='0.0.0.0', port=5000)