package westdex

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net/http"
	"strconv"
	"time"
	"tyapi-server/internal/shared/crypto"
)

var (
	ErrDatasource = errors.New("数据源异常")
	ErrSystem     = errors.New("系统异常")
)

type WestResp struct {
	Message   string `json:"message"`
	Code      string `json:"code"`
	Data      string `json:"data"`
	ID        string `json:"id"`
	ErrorCode *int   `json:"error_code"`
	Reason    string `json:"reason"`
}
type G05HZ01WestResp struct {
	Message   string          `json:"message"`
	Code      string          `json:"code"`
	Data      json.RawMessage `json:"data"`
	ID        string          `json:"id"`
	ErrorCode *int            `json:"error_code"`
	Reason    string          `json:"reason"`
}

type WestConfig struct {
	Url            string
	Key            string
	SecretId       string
	SecretSecondId string
}

type WestDexService struct {
	config WestConfig
}

// NewWestDexService 是一个构造函数，用于初始化 WestDexService
func NewWestDexService(url, key, secretId, secretSecondId string) *WestDexService {
	return &WestDexService{
		config: WestConfig{
			Url:            url,
			Key:            key,
			SecretId:       secretId,
			SecretSecondId: secretSecondId,
		},
	}
}

// CallAPI 调用西部数据的 API
func (w *WestDexService) CallAPI(code string, reqData map[string]interface{}) (resp []byte, err error) {
	// 生成当前的13位时间戳
	timestamp := strconv.FormatInt(time.Now().UnixNano()/int64(time.Millisecond), 10)

	// 构造请求URL
	reqUrl := fmt.Sprintf("%s/%s/%s?timestamp=%s", w.config.Url, w.config.SecretId, code, timestamp)

	jsonData, marshalErr := json.Marshal(reqData)
	if marshalErr != nil {
		return nil, fmt.Errorf("%w: %s", ErrSystem, marshalErr.Error())
	}

	// 创建HTTP POST请求
	req, newRequestErr := http.NewRequest("POST", reqUrl, bytes.NewBuffer(jsonData))
	if newRequestErr != nil {
		return nil, fmt.Errorf("%w: %s", ErrSystem, newRequestErr.Error())
	}

	// 设置请求头
	req.Header.Set("Content-Type", "application/json")

	// 发送请求
	client := &http.Client{}
	httpResp, clientDoErr := client.Do(req)
	if clientDoErr != nil {
		return nil, fmt.Errorf("%w: %s", ErrSystem, clientDoErr.Error())
	}
	defer func(Body io.ReadCloser) {
		closeErr := Body.Close()
		if closeErr != nil {
		}
	}(httpResp.Body)

	// 检查请求是否成功
	if httpResp.StatusCode == 200 {
		// 读取响应体
		bodyBytes, ReadErr := io.ReadAll(httpResp.Body)
		if ReadErr != nil {
			return nil, fmt.Errorf("%w: %s", ErrSystem, ReadErr.Error())
		}

		// 手动调用 json.Unmarshal 触发自定义的 UnmarshalJSON 方法
		var westDexResp WestResp
		UnmarshalErr := json.Unmarshal(bodyBytes, &westDexResp)
		if UnmarshalErr != nil {
			return nil, UnmarshalErr
		}
		if westDexResp.Code != "00000" && westDexResp.Code != "200" && westDexResp.Code != "0" {
			if westDexResp.Data == "" {
				return nil, fmt.Errorf("%w: %s", ErrSystem, westDexResp.Message)
			}
			decryptedData, DecryptErr := crypto.WestDexDecrypt(westDexResp.Data, w.config.Key)
			if DecryptErr != nil {
				return nil, fmt.Errorf("%w: %s", ErrSystem, DecryptErr.Error())
			}
			return decryptedData, fmt.Errorf("%w: %s", ErrDatasource, westDexResp.Message)
		}
		if westDexResp.Data == "" {
			return nil, fmt.Errorf("%w: %s", ErrSystem, westDexResp.Message)
		}
		decryptedData, DecryptErr := crypto.WestDexDecrypt(westDexResp.Data, w.config.Key)
		if DecryptErr != nil {
			return nil, fmt.Errorf("%w: %s", ErrSystem, DecryptErr.Error())
		}

		return decryptedData, nil
	}

	return nil, fmt.Errorf("%w: 西部请求失败Code: %d", ErrSystem, httpResp.StatusCode)
}

// G05HZ01CallAPI 调用西部数据的 G05HZ01 API
func (w *WestDexService) G05HZ01CallAPI(code string, reqData map[string]interface{}) (resp []byte, err error) {
	// 生成当前的13位时间戳
	timestamp := strconv.FormatInt(time.Now().UnixNano()/int64(time.Millisecond), 10)

	// 构造请求URL
	reqUrl := fmt.Sprintf("%s/%s/%s?timestamp=%s", w.config.Url, w.config.SecretSecondId, code, timestamp)

	jsonData, marshalErr := json.Marshal(reqData)
	if marshalErr != nil {
		return nil, fmt.Errorf("%w: %s", ErrSystem, marshalErr.Error())
	}

	// 创建HTTP POST请求
	req, newRequestErr := http.NewRequest("POST", reqUrl, bytes.NewBuffer(jsonData))
	if newRequestErr != nil {
		return nil, fmt.Errorf("%w: %s", ErrSystem, newRequestErr.Error())
	}

	// 设置请求头
	req.Header.Set("Content-Type", "application/json")

	// 发送请求
	client := &http.Client{}
	httpResp, clientDoErr := client.Do(req)
	if clientDoErr != nil {
		return nil, fmt.Errorf("%w: %s", ErrSystem, clientDoErr.Error())
	}
	defer func(Body io.ReadCloser) {
		closeErr := Body.Close()
		if closeErr != nil {
			// 忽略
		}
	}(httpResp.Body)

	if httpResp.StatusCode == 200 {
		bodyBytes, ReadErr := io.ReadAll(httpResp.Body)
		if ReadErr != nil {
			return nil, fmt.Errorf("%w: %s", ErrSystem, ReadErr.Error())
		}
		var westDexResp G05HZ01WestResp
		UnmarshalErr := json.Unmarshal(bodyBytes, &westDexResp)
		if UnmarshalErr != nil {
			return nil, fmt.Errorf("%w: %s", ErrSystem, UnmarshalErr.Error())
		}
		if westDexResp.Code != "0000" {
			if westDexResp.Data == nil {
				return nil, fmt.Errorf("%w: %s", ErrSystem, westDexResp.Message)
			} else {
				return westDexResp.Data, fmt.Errorf("%w: %s", ErrSystem, string(westDexResp.Data))
			}
		}
		if westDexResp.Data == nil {
			return nil, fmt.Errorf("%w: %s", ErrSystem, westDexResp.Message)
		}
		return westDexResp.Data, nil
	} else {
		return nil, fmt.Errorf("%w: 西部请求失败Code: %d", ErrSystem, httpResp.StatusCode)
	}
}

func (w *WestDexService) Encrypt(data string) (string, error) {
	encryptedValue, err := crypto.WestDexEncrypt(data, w.config.Key)
	if err != nil {
		return "", ErrSystem
	}
	return encryptedValue, nil
}
func (w *WestDexService) Md5Encrypt(data string) string {
	return Md5Encrypt(data)
}

func (w *WestDexService) GetConfig() WestConfig {
	return w.config
}