package svc

import (
	"fmt"
	"path"
	"time"

	"git.i2edu.net/i2/go-zero/core/stores/sqlx"
	"git.i2edu.net/i2/go-zero/zrpc"
	"git.i2edu.net/i2/i2-bill-api/internal/config"
	"git.i2edu.net/i2/i2-bill-api/internal/utils"
	"git.i2edu.net/i2/i2-bill-api/model"
	"git.i2edu.net/i2/i2-bill-erp/transformclient"
)

const cacheWechatTokenPrefix = "cache:wechat:token:"

// RdCli defined
type RdCli interface {
	SetCache(key string, v interface{}) error
	GetCache(key string, v interface{}) error
	SetWithExpire(key string, v interface{}, expire time.Duration) error
}

// Wechat defined
type Wechat struct {
	RdCli RdCli
	c     config.Config
}

// GetAccessToken defined
func (wc *Wechat) GetAccessToken() (string, error) {
	token := ""
	err := wc.RdCli.GetCache(cacheWechatTokenPrefix, &token)
	if err == model.ErrRdsNotFound {
		req := utils.Get("https://api.weixin.qq.com/cgi-bin/token")
		req.Param("grant_type", "client_credential")
		req.Param("secret", wc.c.Weixin.Secret)
		req.Param("appid", wc.c.Weixin.Appid)
		var res = struct {
			AccessToken string `json:"access_token"`
			ExpiresIn   int    `json:"expires_in"`
		}{}
		err = req.ToJSON(&res)
		if err != nil {
			return "", err
		}
		fmt.Println(res)
		token = res.AccessToken
		err := wc.RdCli.SetWithExpire(cacheWechatTokenPrefix, res.AccessToken, time.Duration((res.ExpiresIn-60*2))*time.Second)
		if err != nil {
			return "", err
		}
	}
	return token, nil
}

// GetAccessToken defined
func (wc *Wechat) GetQrCode(scene, page string) (string, error) {
	token, err := wc.GetAccessToken()
	if err != nil {
		return "", err
	}
	req := utils.Post("https://api.weixin.qq.com/wxa/getwxacodeunlimit")
	req.Param("access_token", token)
	ph := path.Join("asserts", "qrcode", scene+".png")
	err = req.ToFile(ph)
	if err != nil {
		return "", err
	}
	return ph, err
}

type ServiceContext struct {
	Config      config.Config
	UserModel   model.UserModel
	RdCli       RdCli
	Wechat      *Wechat
	Transformer transformclient.Transform
}

func NewServiceContext(c config.Config) *ServiceContext {
	svc := &ServiceContext{
		Config:      c,
		Transformer: transformclient.NewTransform(zrpc.MustNewClient(c.Transform)),
		UserModel:   model.NewUserModel(sqlx.NewMysql(c.DataSource), c.Cache),
	}
	svc.RdCli = svc.UserModel.CacheStorage()
	svc.Wechat = &Wechat{
		RdCli: svc.RdCli,
		c:     c,
	}
	return svc
}