from flask import Flask, request, jsonify
from werkzeug.utils import secure_filename
import os
from datetime import datetime
import logging
from dotenv import load_dotenv
from hf_uploader import upload_file, upload_folder
import tempfile
import shutil

# Load environment variables
load_dotenv()

# Setup Flask app
app = Flask(__name__)
app.config['MAX_CONTENT_LENGTH'] = 100 * 1024 * 1024  # 100MB max file size
app.config['UPLOAD_FOLDER'] = 'uploads'

# Setup logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Create uploads folder if not exists
if not os.path.exists(app.config['UPLOAD_FOLDER']):
    os.makedirs(app.config['UPLOAD_FOLDER'])

# Allowed file extensions (optional, allow all)
ALLOWED_EXTENSIONS = set(['*'])

def allowed_file(filename):
    return True  # Allow all files

@app.route('/', methods=['GET'])
def health_check():
    """Health check endpoint"""
    return jsonify({
        'status': 'ok',
        'message': 'Hugging Face File Upload API',
        'version': '1.0.0',
        'language': 'Python',
        'framework': 'Flask',
        'endpoints': {
            'upload': {
                'method': 'POST',
                'path': '/api/upload',
                'description': 'Upload file ke Hugging Face dataset',
                'required': ['file', 'repo_id', 'token'],
                'optional': ['subfolder']
            }
        }
    })

@app.route('/api/upload', methods=['POST'])
def upload():
    """Upload file to Hugging Face"""
    try:
        # Validasi file
        if 'file' not in request.files:
            return jsonify({
                'success': False,
                'error': 'File tidak ditemukan'
            }), 400

        file = request.files['file']
        if file.filename == '':
            return jsonify({
                'success': False,
                'error': 'File tidak dipilih'
            }), 400

        if not allowed_file(file.filename):
            return jsonify({
                'success': False,
                'error': 'File type tidak diizinkan'
            }), 400

        # Get form data
        repo_id = request.form.get('repo_id') or os.getenv('HF_REPO_ID')
        token = request.form.get('token') or os.getenv('HF_TOKEN')
        subfolder = request.form.get('subfolder', '')

        # Validate required fields
        if not repo_id or not token:
            return jsonify({
                'success': False,
                'error': 'repo_id dan token diperlukan (kirim via request atau set di .env)',
                'required_fields': ['repo_id', 'token'],
                'hint': 'Set HF_REPO_ID dan HF_TOKEN di .env atau kirim via form data'
            }), 400

        # Save file temporarily
        filename = secure_filename(file.filename)
        temp_dir = tempfile.mkdtemp()
        file_path = os.path.join(temp_dir, filename)
        file.save(file_path)

        file_size = os.path.getsize(file_path)

        logger.info(f'Uploading {filename} ({file_size} bytes) to {repo_id}')

        try:
            # Upload to Hugging Face
            result = upload_file(
                file_path=file_path,
                file_name=filename,
                repo_id=repo_id,
                token=token,
                subfolder=subfolder
            )

            # Cleanup
            shutil.rmtree(temp_dir)

            return jsonify({
                'success': True,
                'message': 'File berhasil di-upload ke Hugging Face',
                'data': {
                    'file_name': filename,
                    'file_size': file_size,
                    'repo_id': repo_id,
                    'path_prefix': '/u/',
                    'subfolder': subfolder or 'root',
                    'url': result['url'],
                    'file_path': result['file_path'],
                    'upload_timestamp': datetime.utcnow().isoformat() + 'Z'
                }
            }), 200

        except Exception as upload_error:
            # Cleanup on error
            shutil.rmtree(temp_dir)
            logger.error(f'Upload error: {str(upload_error)}')

            error_msg = str(upload_error)
            if 'Token' in error_msg or 'Unauthorized' in error_msg:
                return jsonify({
                    'success': False,
                    'error': 'Token tidak valid atau expired'
                }), 401
            elif 'Repository' in error_msg or 'Not found' in error_msg:
                return jsonify({
                    'success': False,
                    'error': f'Repository tidak ditemukan: {repo_id}'
                }), 404
            else:
                return jsonify({
                    'success': False,
                    'error': error_msg
                }), 500

    except Exception as error:
        logger.error(f'Error: {str(error)}')
        return jsonify({
            'success': False,
            'error': 'Internal Server Error',
            'message': str(error)
        }), 500

@app.errorhandler(404)
def not_found(error):
    """404 handler"""
    return jsonify({
        'success': False,
        'error': 'Endpoint tidak ditemukan'
    }), 404

@app.errorhandler(500)
def server_error(error):
    """500 handler"""
    return jsonify({
        'success': False,
        'error': 'Internal Server Error'
    }), 500

if __name__ == '__main__':
    port = int(os.getenv('PORT', 3000))
    debug = os.getenv('NODE_ENV', 'development') == 'development'
    
    logger.info(f'🚀 API server berjalan di http://localhost:{port}')
    logger.info(f'📤 Endpoint upload: POST http://localhost:{port}/api/upload')
    
    app.run(host='0.0.0.0', port=port, debug=debug)