import requests
import json
from datetime import datetime

class QWeatherAPI:
    def __init__(self, api_key):
        self.api_key = api_key
        self.base_url = "https://devapi.qweather.com/v7/weather/now"
        self.geo_url = "https://geoapi.qweather.com/v2/city/lookup"
        
    def verify_api_key(self):
        """
        验证API密钥是否有效
        """
        try:
            # 使用一个简单的城市ID测试API
            test_params = {
                "location": "101010100",  # 北京的城市ID
                "key": self.api_key
            }
            
            response = requests.get(self.base_url, params=test_params)
            data = response.json()
            
            if data["code"] == "402":
                print("错误: API密钥无效或已过期")
                print("请检查:")
                print("1. API密钥是否正确")
                print("2. 是否使用了正确的API版本（开发版/正式版）")
                print("3. API密钥是否已过期")
                return False
            elif data["code"] == "200":
                return True
            else:
                print(f"API返回错误: {data['code']}")
                return False
                
        except Exception as e:
            print(f"验证API密钥时发生错误: {e}")
            return False
        
    def search_city(self, location_name, range=None, number=1):
        """
        搜索城市
        :param location_name: 城市名称，如 "北京"、"上海" 等
        :param range: 搜索范围，使用ISO 3166国家代码，如 "cn"
        :param number: 返回结果数量，范围1-20，默认1
        :return: 城市信息列表
        """
        try:
            params = {
                "location": location_name,
                "key": self.api_key,
                "number": min(max(1, number), 20)  # 确保number在1-20之间
            }
            
            # 添加可选参数
            if range:
                params["range"] = range
            
            response = requests.get(self.geo_url, params=params)
            response.raise_for_status()
            
            data = response.json()
            
            if data["code"] == "402":
                print(data)
                print("错误: API密钥无效或已过期")
                print("请检查:")
                print("1. API密钥是否正确")
                print("2. 是否使用了正确的API版本（开发版/正式版）")
                print("3. API密钥是否已过期")
                return None
            elif data["code"] != "200":
                print(f"城市查询API返回错误: {data['code']}")
                return None
                
            return data.get("location", [])
            
        except requests.exceptions.RequestException as e:
            print(f"请求错误: {e}")
            return None
        except json.JSONDecodeError as e:
            print(f"JSON解析错误: {e}")
            return None
        except Exception as e:
            print(f"未知错误: {e}")
            return None

    def get_weather(self, location):
        """
        获取实时天气数据
        :param location: 城市ID或经纬度坐标，如 "101010100" 或 "116.41,39.92"
        :return: 天气数据字典
        """
        try:
            params = {
                "location": location,
                "key": self.api_key
            }
            
            response = requests.get(self.base_url, params=params)
            response.raise_for_status()  # 检查HTTP错误
            
            data = response.json()
            
            if data["code"] == "402":
                print("错误: API密钥无效或已过期")
                print("请检查:")
                print("1. API密钥是否正确")
                print("2. 是否使用了正确的API版本（开发版/正式版）")
                print("3. API密钥是否已过期")
                return None
            elif data["code"] != "200":
                print(f"API返回错误: {data['code']}")
                return None
                
            return data
            
        except requests.exceptions.RequestException as e:
            print(f"请求错误: {e}")
            return None
        except json.JSONDecodeError as e:
            print(f"JSON解析错误: {e}")
            return None
        except Exception as e:
            print(f"未知错误: {e}")
            return None

def format_weather_data(data, city_info):
    """
    格式化天气数据为易读的格式
    """
    if not data or "now" not in data:
        return "无法获取天气数据"
        
    now = data["now"]
    return f"""
城市信息:
名称: {city_info['name']}
所属地区: {city_info.get('adm2', 'N/A')}
所属省份: {city_info.get('adm1', 'N/A')}
所属国家: {city_info.get('country', 'N/A')}

实时天气信息:
观测时间: {now['obsTime']}
温度: {now['temp']}°C
体感温度: {now['feelsLike']}°C
天气状况: {now['text']}
风向: {now['windDir']}
风力等级: {now['windScale']}级
风速: {now['windSpeed']}km/h
相对湿度: {now['humidity']}%
降水量: {now['precip']}mm
大气压强: {now['pressure']}hPa
能见度: {now['vis']}km
云量: {now['cloud']}%
露点温度: {now['dew']}°C
"""