import requests
import json
import os
from requests.exceptions import RequestException

CONFIG_PATH = os.path.join(os.path.dirname(__file__), 'config.json')

def load_config():
    if os.path.exists(CONFIG_PATH):
        with open(CONFIG_PATH, 'r') as f:
            return json.load(f)
    return {"server_url": "http://localhost:5000", "default_expiry": "24h"}

def save_config(config):
    try:
        with open(CONFIG_PATH, 'w') as f:
            json.dump(config, f, indent=4)
    except IOError as e:
        raise Exception(f"保存配置失败: {e}")

def upload_file(filepath, expiry='24h', server_url=None):
    if server_url is None:
        config = load_config()
        server_url = config.get('server_url', 'http://localhost:5000')
    
    url = f"{server_url}/api/upload"
    
    try:
        with open(filepath, 'rb') as f:
            files = {'file': (os.path.basename(filepath), f)}
            data = {'expiry': expiry}
            
            response = requests.post(url, files=files, data=data, timeout=30)
    except RequestException as e:
        raise Exception(f"网络请求失败: {e}")
    
    if response.status_code == 200:
        try:
            return response.json()
        except json.JSONDecodeError:
            raise Exception("服务器响应格式错误")
    else:
        try:
            error_msg = response.json().get('error', '未知错误')
        except json.JSONDecodeError:
            error_msg = '未知错误'
        raise Exception(f"上传失败: {error_msg}")

def get_file_info(file_id, server_url=None):
    if server_url is None:
        config = load_config()
        server_url = config.get('server_url', 'http://localhost:5000')
    
    url = f"{server_url}/api/file/{file_id}"
    
    try:
        response = requests.get(url, timeout=30)
    except RequestException as e:
        raise Exception(f"网络请求失败: {e}")
    
    if response.status_code == 200:
        try:
            return response.json()
        except json.JSONDecodeError:
            return None
    else:
        return None