from flask import Flask, render_template, request, send_file, flash, redirect, url_for
from rembg import remove
from PIL import Image
from io import BytesIO

app = Flask(__name__)

# Update allowed extensions to include additional file types
ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'gif', 'bmp', 'tiff', 'webp'}
# Set max content length to 1GB (expressed in bytes)
app.config['MAX_CONTENT_LENGTH'] = 1 * 1024 * 1024 * 1024  # 1 GB limit

def file_allowed(filename):
    """
    Check if the file has an allowed extension.
    """
    return '.' in filename and filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS

@app.route('/', methods=['GET', 'POST'])
def upload_file():
    """
    Handle file upload via POST, process image to remove background, and return the processed image.
    """
    if request.method == 'POST':
        file = request.files.get('file', None)
        if file and file_allowed(file.filename):
            try:
                input_image = Image.open(file.stream)
                output_image = remove(input_image, post_process_mask=True)
                img_io = BytesIO()
                output_image.save(img_io, 'PNG')
                img_io.seek(0)
                return send_file(img_io, mimetype='image/png', as_attachment=True, download_name='processed_image.png')
            except Exception as e:
                flash('Failed to process the image. Error: {}'.format(e), 'error')
                return redirect(url_for('upload_file'))
        else:
            flash('Please upload a valid image file (PNG, JPG, JPEG, GIF, BMP, TIFF, WEBP).', 'error')
        return redirect(url_for('upload_file'))
    return render_template('index.html')

if __name__ == '__main__':
    app.run(host='0.0.0.0', debug=True, port=5124)