import os
import uuid
from datetime import datetime
from flask import Flask, request, render_template, send_file, jsonify, url_for, abort
from config import UPLOAD_FOLDER, SECRET_KEY, MAX_CONTENT_LENGTH, EXPIRY_OPTIONS, DAILY_TRAFFIC_LIMIT

MAX_FILE_SIZE_MB = MAX_CONTENT_LENGTH // (1024 * 1024)
DAILY_GB = DAILY_TRAFFIC_LIMIT // (1024 * 1024 * 1024)
from database import init_db, add_file, get_file, delete_file, cleanup_expired, add_upload_traffic, add_download_traffic, get_client_ip, is_traffic_exceeded, get_daily_traffic, get_monthly_stats

app = Flask(__name__)
app.config['SECRET_KEY'] = SECRET_KEY
app.config['MAX_CONTENT_LENGTH'] = MAX_CONTENT_LENGTH
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER

os.makedirs(UPLOAD_FOLDER, exist_ok=True)
init_db()

@app.route('/')
def index():
    stats = get_monthly_stats()
    return render_template('index.html',
        expiry_options=EXPIRY_OPTIONS,
        max_file_size_mb=MAX_FILE_SIZE_MB,
        daily_gb=DAILY_GB,
        stats=stats)

@app.route('/upload', methods=['POST'])
def upload():
    if 'file' not in request.files:
        return jsonify({'error': 'No file provided'}), 400

    file = request.files['file']
    if file.filename == '':
        return jsonify({'error': 'No file selected'}), 400

    expiry_key = request.form.get('expiry', '24h')
    expiry_seconds = EXPIRY_OPTIONS.get(expiry_key, EXPIRY_OPTIONS['24h'])
    expiry_hours = expiry_seconds // 3600

    ip = get_client_ip(request)
    content_length = request.content_length or 0

    if is_traffic_exceeded(ip, content_length, 'upload'):
        return jsonify({'error': 'Daily traffic limit exceeded (20GB)'}), 429

    file_id = str(uuid.uuid4())
    filename = file.filename
    filepath = os.path.join(UPLOAD_FOLDER, file_id)
    file.save(filepath)

    filesize = os.path.getsize(filepath)
    add_file(file_id, filename, filepath, filesize, expiry_hours)
    add_upload_traffic(ip, filesize)

    share_url = url_for('download_file', file_id=file_id, _external=True)
    return jsonify({'id': file_id, 'filename': filename, 'share_url': share_url})

@app.route('/api/upload', methods=['POST'])
def api_upload():
    if 'file' not in request.files:
        return jsonify({'error': 'No file provided'}), 400

    file = request.files['file']
    if file.filename == '':
        return jsonify({'error': 'No file selected'}), 400

    expiry_key = request.form.get('expiry', '24h')
    expiry_seconds = EXPIRY_OPTIONS.get(expiry_key, EXPIRY_OPTIONS['24h'])
    expiry_hours = expiry_seconds // 3600

    ip = get_client_ip(request)
    content_length = request.content_length or 0

    if is_traffic_exceeded(ip, content_length, 'upload'):
        return jsonify({'error': 'Daily traffic limit exceeded (20GB)'}), 429

    file_id = str(uuid.uuid4())
    filename = file.filename
    filepath = os.path.join(UPLOAD_FOLDER, file_id)
    file.save(filepath)

    filesize = os.path.getsize(filepath)
    add_file(file_id, filename, filepath, filesize, expiry_hours)
    add_upload_traffic(ip, filesize)

    share_url = url_for('download_file', file_id=file_id, _external=True)
    return jsonify({'id': file_id, 'filename': filename, 'filesize': filesize, 'expiry_hours': expiry_hours, 'share_url': share_url})

@app.route('/file/<file_id>')
def download_file(file_id):
    cleanup_expired()
    row = get_file(file_id)
    if not row:
        abort(404)
    return render_template('download.html', file=row)

@app.route('/api/file/<file_id>')
def api_get_file(file_id):
    cleanup_expired()
    row = get_file(file_id)
    if not row:
        return jsonify({'error': 'File not found or expired'}), 404

    ip = get_client_ip(request)
    upload, download = get_daily_traffic(ip)
    return jsonify({
        'id': row['id'],
        'filename': row['filename'],
        'filesize': row['filesize'],
        'created_at': row['created_at'],
        'expires_at': row['expires_at'],
        'daily_upload': upload,
        'daily_download': download,
        'traffic_limit': DAILY_TRAFFIC_LIMIT
    })

@app.route('/download/<file_id>')
def serve_file(file_id):
    row = get_file(file_id)
    if not row:
        abort(404)

    ip = get_client_ip(request)
    add_download_traffic(ip, row['filesize'])

    return send_file(row['filepath'], download_name=row['filename'], as_attachment=True)

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