from flask import (
    Flask,
    json, 
    render_template, 
    request, 
    jsonify, 
    redirect, 
    url_for,
    send_file,
    Response
)
from io import BytesIO
import urllib.parse
from functools import wraps
import requests
import hashlib
import os
from config import Config
from models import Database
from utils import get_file_type, format_file_size
from huggingface_hub import HfApi

# 初始化 HuggingFace API
api = HfApi(token=Config.HF_TOKEN)
app = Flask(__name__)
app.config['SECRET_KEY'] = Config.SECRET_KEY
db = Database()

def require_auth(f):
    @wraps(f)
    def decorated(*args, **kwargs):
        if not Config.REQUIRE_LOGIN:
            return f(*args, **kwargs)
        if not request.cookies.get('authenticated'):
            if request.is_json:
                return jsonify({'error': 'Unauthorized'}), 401
            return redirect(url_for('login'))
        return f(*args, **kwargs)
    return decorated

@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        if request.form.get('password') == Config.ACCESS_PASSWORD:
            response = jsonify({'success': True})
            response.set_cookie('authenticated', 'true', secure=True, httponly=True)
            return response
        return jsonify({'error': 'Invalid password'}), 401
    return render_template('login.html')

@app.route('/logout')
def logout():
    response = redirect(url_for('login'))
    response.delete_cookie('authenticated')
    return response

@app.route('/')
@require_auth
def index():
    return render_template('index.html')

@app.route('/api/files/list/')
@app.route('/api/files/list/<path:directory>')
@require_auth
def list_files(directory=''):
    try:
        url = f"https://huggingface.co/api/datasets/{Config.HF_DATASET_ID}/tree/{Config.HF_BRANCH}"
        if directory:
            url = f"{url}/{directory}"
            
        response = requests.get(
            url, 
            headers={'Authorization': f'Bearer {Config.HF_TOKEN}'}
        )
        if not response.ok:
            return jsonify({'error': 'Failed to fetch files', 'details': response.text}), response.status_code
        
        files = response.json()
        for file in files:
            if file['type'] == 'file':
                file['file_type'] = get_file_type(file['path'])
                file['size_formatted'] = format_file_size(file['size'])
                # 添加预览和下载URL
                file['preview_url'] = f"/api/files/preview/{file['path']}"
                file['download_url'] = f"/api/files/download/{file['path']}"
                
        return jsonify(files)
    except Exception as e:
        return jsonify({'error': str(e)}), 500

@app.route('/api/files/preview/<path:filepath>')
@require_auth
def preview_file(filepath):
    try:
        file_type = get_file_type(filepath)
        if file_type not in ['image', 'video', 'document']:
            return jsonify({'error': 'File type not supported for preview'}), 400
            
        url = f"https://{Config.PROXY_DOMAIN}/datasets/{Config.HF_DATASET_ID}/resolve/{Config.HF_BRANCH}/{filepath}"
        response = requests.get(
            url,
            headers={'Authorization': f'Bearer {Config.HF_TOKEN}'},
            stream=True
        )
        
        if response.ok:
            def generate():
                for chunk in response.iter_content(chunk_size=8192):
                    yield chunk
            
            return Response(
                generate(),
                mimetype=response.headers.get('content-type', 'application/octet-stream'),
                direct_passthrough=True
            )
        
        return jsonify({'error': 'Failed to fetch file'}), response.status_code
    except Exception as e:
        return jsonify({'error': str(e)}), 500

@app.route('/api/files/download/<path:filepath>')
@require_auth
def download_file(filepath):
    try:
        url = f"https://{Config.PROXY_DOMAIN}/datasets/{Config.HF_DATASET_ID}/resolve/{Config.HF_BRANCH}/{filepath}"
        
        # 先发送 HEAD 请求获取文件信息
        head_response = requests.head(
            url,
            headers={'Authorization': f'Bearer {Config.HF_TOKEN}'},
            allow_redirects=True
        )
        
        if head_response.ok:
            # 获取文件基本信息
            content_type = head_response.headers.get('content-type', 'application/octet-stream')
            content_length = head_response.headers.get('content-length')
            last_modified = head_response.headers.get('last-modified')
            etag = head_response.headers.get('etag')
            
            # 如果是txt文件但没有指定字符集,设置为text/plain
            if filepath.lower().endswith('.txt') and 'charset' not in content_type:
                content_type = 'text/plain'
                
            # 获取文件内容
            response = requests.get(
                url,
                headers={'Authorization': f'Bearer {Config.HF_TOKEN}'},
                stream=True
            )
            
            if response.ok:
                filename = os.path.basename(filepath)
                encoded_filename = urllib.parse.quote(filename.encode('utf-8'))
                
                headers = {
                    'Content-Disposition': f'attachment; filename*=UTF-8\'\'{encoded_filename}',
                    'Content-Type': content_type,
                    'Content-Length': content_length,
                    'Accept-Ranges': 'bytes',
                    'Cache-Control': 'no-cache',
                    'Last-Modified': last_modified,
                    'ETag': etag
                }
                
                # 移除为None的header
                headers = {k: v for k, v in headers.items() if v is not None}
                
                return Response(
                    response.iter_content(chunk_size=1048576),
                    headers=headers
                )
                
        return jsonify({'error': 'File not found'}), 404
        
    except Exception as e:
        print(f"Download error for {filepath}: {str(e)}")
        return jsonify({'error': str(e)}), 500
    
@app.route('/api/files/upload', methods=['POST'])
@require_auth
def upload_file():
    if 'file' not in request.files:
        return jsonify({'error': 'No file provided'}), 400
        
    file = request.files['file']
    current_path = request.form.get('path', '').strip('/')
    
    try:
        file_content = file.read()
        file.seek(0)
        
        original_name = file.filename
        stored_name = original_name
        full_path = os.path.join(current_path, stored_name).replace("\\", "/")
        
        response = api.upload_file(
            path_or_fileobj=file_content,
            path_in_repo=full_path,
            repo_id=Config.HF_DATASET_ID,
            repo_type="dataset",
            token=Config.HF_TOKEN
        )
        
        if response:
            with db.conn.cursor() as cursor:
                cursor.execute("""
                    INSERT INTO files (
                        original_name, stored_name, file_path, 
                        file_type, file_size
                    ) VALUES (%s, %s, %s, %s, %s)
                """, (
                    original_name,
                    stored_name,
                    full_path,
                    get_file_type(original_name),
                    len(file_content)
                ))
                db.conn.commit()
            
            return jsonify({'success': True})
        
        return jsonify({'error': 'Upload failed'}), 500
        
    except Exception as e:
        return jsonify({'error': str(e)}), 500
   
@app.route('/api/files/search')
@require_auth
def search_files():
    keyword = request.args.get('keyword', '')
    if not keyword:
        return jsonify([])
    
    try:
        files = db.search_files(keyword)
        return jsonify([{
            'type': 'file',
            'path': f['file_path'],
            'file_type': get_file_type(f['file_path']),
            'size': f['file_size'],
            'size_formatted': format_file_size(f['file_size']),
            'preview_url': f'/api/files/preview/{f["file_path"]}',
            'download_url': f'/api/files/download/{f["file_path"]}'
        } for f in files])
    except Exception as e:
        return jsonify({'error': str(e)}), 500

@app.route('/api/files/delete/<path:filepath>', methods=['DELETE'])
@require_auth
def delete_file(filepath):
    try:
        # Initialize HuggingFace API
        api = HfApi(token=Config.HF_TOKEN)
        
        # Delete file from HuggingFace Hub
        api.delete_file(
            path_in_repo=filepath,
            repo_id=Config.HF_DATASET_ID,
            repo_type="dataset"
        )
        
        # Delete file record from database
        with db.conn.cursor() as cursor:
            cursor.execute(
                "DELETE FROM files WHERE file_path = %s",
                [filepath]
            )
            db.conn.commit()
        
        return jsonify({'success': True})
        
    except Exception as e:
        return jsonify({'error': str(e)}), 500
    
@app.route('/api/files/create_folder', methods=['POST'])
@require_auth
def create_folder():
    try:
        data = request.json
        path = data.get('path', '/')
        name = data.get('name')
        
        if not name:
            return jsonify({'error': 'Folder name is required'}), 400
            
        full_path = os.path.join(path, name, '.keep').replace("\\", "/")
        
        # 使用 HuggingFace API 创建文件夹
        api = HfApi(token=Config.HF_TOKEN)
        response = api.upload_file(
            path_or_fileobj=b'',  # 空内容
            path_in_repo=full_path,
            repo_id=Config.HF_DATASET_ID,
            repo_type="dataset",
            token=Config.HF_TOKEN
        )
        
        if response:
            # 记录到数据库
            with db.conn.cursor() as cursor:
                cursor.execute("""
                    INSERT INTO files (
                        original_name, stored_name, file_path, 
                        file_type, file_size
                    ) VALUES (%s, %s, %s, %s, %s)
                """, (
                    '.keep',
                    '.keep',
                    full_path,
                    'directory',
                    0
                ))
                db.conn.commit()
                
            return jsonify({'message': 'Folder created successfully'})
            
        return jsonify({'error': 'Failed to create folder'}), 500
            
    except Exception as e:
        return jsonify({'error': str(e)}), 500
    
if __name__ == '__main__':
    app.run(host='0.0.0.0', port=7860, debug=True)