import os
from flask import jsonify, request, send_file, current_app
from io import BytesIO
from .. import files_bp
from flask import request, jsonify
from werkzeug.utils import secure_filename


from services.files.service import (
    get_files_list, 
    get_file_info, 
    download_file_from_minio, 
    delete_file, 
    batch_delete_files,
    get_minio_client,
    upload_files_to_server
)
from services.files.utils import FileType

UPLOAD_FOLDER = '/data/uploads'
ALLOWED_EXTENSIONS = {'txt', 'pdf', 'png', 'jpg', 'jpeg', 'gif', 'doc', 'docx', 'xls', 'xlsx'}

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

@files_bp.route('/upload', methods=['POST'])
def upload_file():
    if 'files' not in request.files:
        return jsonify({'code': 400, 'message': '未选择文件', 'data': None}), 400
    
    files = request.files.getlist('files')
    upload_result = upload_files_to_server(files)
    
    # 返回标准格式
    return jsonify({
        'code': 0,
        'message': '上传成功',
        'data': upload_result['data']
    })

@files_bp.route('', methods=['GET', 'OPTIONS'])
def get_files():
    """获取文件列表的API端点"""
    if request.method == 'OPTIONS':
        return '', 200
        
    try:
        current_page = int(request.args.get('currentPage', 1))
        page_size = int(request.args.get('size', 10))
        name_filter = request.args.get('name', '')
        
        result, total = get_files_list(current_page, page_size, name_filter)
        
        return jsonify({
            "code": 0,
            "data": {
                "list": result,
                "total": total
            },
            "message": "获取文件列表成功"
        })
    
    except Exception as e:
        return jsonify({
            "code": 500,
            "message": f"获取文件列表失败: {str(e)}"
        }), 500

@files_bp.route('/<string:file_id>/download', methods=['GET', 'OPTIONS'])
def download_file(file_id):
    try:
        current_app.logger.info(f"开始处理文件下载请求: {file_id}")
        
        # 获取文件信息
        file = get_file_info(file_id)
        
        if not file:
            current_app.logger.error(f"文件不存在: {file_id}")
            return jsonify({
                "code": 404, 
                "message": f"文件 {file_id} 不存在",
                "details": "文件记录不存在或已被删除"
            }), 404
        
        if file['type'] == FileType.FOLDER.value:
            current_app.logger.error(f"不能下载文件夹: {file_id}")
            return jsonify({
                "code": 400, 
                "message": "不能下载文件夹",
                "details": "请选择一个文件进行下载"
            }), 400
            
        current_app.logger.info(f"文件信息获取成功: {file_id}, 存储位置: {file['parent_id']}/{file['location']}")
        
        try:
            # 从MinIO下载文件
            file_data, filename = download_file_from_minio(file_id)
            
            # 创建内存文件对象
            file_stream = BytesIO(file_data)
            
            # 返回文件
            return send_file(
                file_stream,
                download_name=filename,
                as_attachment=True,
                mimetype='application/octet-stream'
            )
            
        except Exception as e:
            current_app.logger.error(f"下载文件失败: {str(e)}")
            return jsonify({
                "code": 500,
                "message": "下载文件失败",
                "details": str(e)
            }), 500
            
    except Exception as e:
        current_app.logger.error(f"处理下载请求时出错: {str(e)}")
        return jsonify({
            "code": 500,
            "message": "处理下载请求时出错",
            "details": str(e)
        }), 500

@files_bp.route('/<string:file_id>', methods=['DELETE', 'OPTIONS'])
def delete_file_route(file_id):
    """删除文件的API端点"""
    if request.method == 'OPTIONS':
        return '', 200
        
    try:
        success = delete_file(file_id)
        
        if success:
            return jsonify({
                "code": 0,
                "message": "文件删除成功"
            })
        else:
            return jsonify({
                "code": 404,
                "message": f"文件 {file_id} 不存在"
            }), 404
    
    except Exception as e:
        return jsonify({
            "code": 500,
            "message": f"删除文件失败: {str(e)}"
        }), 500

@files_bp.route('/batch', methods=['DELETE', 'OPTIONS'])
def batch_delete_files_route():
    """批量删除文件的API端点"""
    if request.method == 'OPTIONS':
        return '', 200
        
    try:
        data = request.json
        file_ids = data.get('ids', [])
        
        if not file_ids:
            return jsonify({
                "code": 400,
                "message": "未提供要删除的文件ID"
            }), 400
        
        success_count = batch_delete_files(file_ids)
        
        return jsonify({
            "code": 0,
            "message": f"成功删除 {success_count}/{len(file_ids)} 个文件"
        })
    
    except Exception as e:
        return jsonify({
            "code": 500,
            "message": f"批量删除文件失败: {str(e)}"
        }), 500