package dingtalk

import (
	"ai_scheduler/internal/config"
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"io"
	"net/http"
	"net/url"
)

// Client 使用官方接口获取 AccessToken，并通过 HTTP 直接调用 TopAPI
type Client struct {
	cfg *config.Config
}

// NewDingTalkClient 基于配置创建钉钉客户端（无 fastwego 依赖）
func NewDingTalkClient(cfg *config.Config) *Client { return &Client{cfg: cfg} }

type UserDetail struct {
	UserID  string `json:"userid"`
	Name    string `json:"name"`
	UnionID string `json:"unionid"`
}

// getAccessToken 通过官方接口获取应用 AccessToken（简单实现，每次请求刷新，不做缓存）
func (c *Client) getAccessToken(ctx context.Context) (string, error) {
	// 调用旧版 OAPI 获取 access_token，供 /topapi 使用
	appKey := c.cfg.Tools.DingTalkBot.APIKey
	appSecret := c.cfg.Tools.DingTalkBot.APISecret
	params := url.Values{}
	params.Add("appkey", appKey)
	params.Add("appsecret", appSecret)
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, "https://oapi.dingtalk.com/gettoken?"+params.Encode(), nil)
	if err != nil {
		return "", err
	}
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()
	b, err := io.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}
	var r struct {
		ErrCode     int    `json:"errcode"`
		ErrMsg      string `json:"errmsg"`
		AccessToken string `json:"access_token"`
		ExpiresIn   int    `json:"expires_in"`
	}
	if err := json.Unmarshal(b, &r); err != nil {
		return "", err
	}
	if r.ErrCode != 0 || r.AccessToken == "" {
		if r.ErrMsg == "" {
			r.ErrMsg = "gettoken failed"
		}
		return "", errors.New(r.ErrMsg)
	}
	return r.AccessToken, nil
}

// QueryUserDetails 按 userId 查询用户详情
func (c *Client) QueryUserDetails(ctx context.Context, userId string) (*UserDetail, error) {
	accessToken, err := c.getAccessToken(ctx)
	if err != nil {
		return nil, err
	}
	body := struct {
		UserId   string `json:"userid"`
		Language string `json:"language,omitempty"`
	}{UserId: userId, Language: "zh_CN"}
	b, _ := json.Marshal(body)
	// 直接调用 TopAPI（oapi.dingtalk.com），通过 query 参数携带 access_token
	// 官方 SDK 无 topapi 封装，此处保留原接口以保证行为一致
	params := url.Values{}
	params.Add("access_token", accessToken)
	req, err := http.NewRequestWithContext(ctx, http.MethodPost, "https://oapi.dingtalk.com/topapi/v2/user/get?"+params.Encode(), bytes.NewReader(b))
	if err != nil {
		return nil, err
	}
	req.Header.Set("Content-Type", "application/json")
	httpResp, err := http.DefaultClient.Do(req)
	if err != nil {
		return nil, err
	}
	defer httpResp.Body.Close()
	res, err := io.ReadAll(httpResp.Body)
	if err != nil {
		return nil, err
	}

	var resp struct {
		Code   int        `json:"errcode"`
		Msg    string     `json:"errmsg"`
		Result UserDetail `json:"result"`
	}
	if err := json.Unmarshal(res, &resp); err != nil {
		return nil, err
	}
	if resp.Code != 0 {
		return nil, errors.New(resp.Msg)
	}

	return &resp.Result, nil
}

// QueryUserDetailsByMobile 按手机号查询用户详情
func (c *Client) QueryUserDetailsByMobile(ctx context.Context, mobile string) (*UserDetail, error) {
	accessToken, err := c.getAccessToken(ctx)
	if err != nil {
		return nil, err
	}
	body := struct {
		Mobile string `json:"mobile"`
	}{Mobile: mobile}
	b, _ := json.Marshal(body)
	// 直接调用 TopAPI（oapi.dingtalk.com），通过 query 参数携带 access_token
	params := url.Values{}
	params.Add("access_token", accessToken)
	req, err := http.NewRequestWithContext(ctx, http.MethodPost, "https://oapi.dingtalk.com/topapi/v2/user/getbymobile?"+params.Encode(), bytes.NewReader(b))
	if err != nil {
		return nil, err
	}
	req.Header.Set("Content-Type", "application/json")
	httpResp, err := http.DefaultClient.Do(req)
	if err != nil {
		return nil, err
	}
	defer httpResp.Body.Close()
	res, err := io.ReadAll(httpResp.Body)
	if err != nil {
		return nil, err
	}

	var resp struct {
		Code   int        `json:"errcode"`
		Msg    string     `json:"errmsg"`
		Result UserDetail `json:"result"`
	}
	if err := json.Unmarshal(res, &resp); err != nil {
		return nil, err
	}
	if resp.Code != 0 {
		return nil, errors.New(resp.Msg)
	}

	return &resp.Result, nil
}