package wechat

import (
	"net/url"
	"time"

	"encoding/json"
)

func keyMini(appid string) string {
	return "wechat:mini:client:" + appid
}

// NewMiniClient new mini client
func NewMiniClient(appID, appSecret string) *MiniClient {
	key := keyMini(appID)
	if v, ok := cache.Load(key); ok {
		return v.(*MiniClient)
	}
	c := &MiniClient{AppID: appID, AppSecret: appSecret}
	cache.Store(key, c)
	return c
}

// GetMiniOpenID get openid by code
func (mc *MiniClient) GetMiniOpenID(frm FormCode) (openid string, err error) {
	uri := BaseURL + "/sns/jscode2session?"

	args := url.Values{}
	args.Add("grant_type", "authorization_code")
	args.Add("appid", mc.AppID)
	args.Add("secret", mc.AppSecret)
	args.Add("js_code", frm.Code)

	uri += args.Encode()
	var res Response
	if res, err = getJSON(uri); err == nil {
		openid = res.OpenID
	}
	return
}

// getToken get token
func (mc *MiniClient) getToken() (token string, err error) {
	now := time.Now().Unix()
	if mc.LastTokenTime > 0 {
		if now-mc.LastTokenTime < TokenExpires {
			token = mc.AccessToken
			return
		}
	}
	uri := BaseURL + "/cgi-bin/token?"

	args := url.Values{}
	args.Add("grant_type", "client_credential")
	args.Add("appid", mc.AppID)
	args.Add("secret", mc.AppSecret)

	uri += args.Encode()
	var res Response
	if res, err = getJSON(uri); err == nil {
		mc.LastTokenTime = now
		mc.AccessToken = res.AccessToken
		token = mc.AccessToken
		key := keyMini(mc.AppID)
		cache.Store(key, mc)
	}
	return
}

// TemplateList /cgi-bin/wxopen/template/list
func (mc *MiniClient) TemplateList(offset, count int) (body []byte, err error) {
	uri := BaseURL + "/cgi-bin/wxopen/template/list?"

	if mc.AccessToken, err = mc.getToken(); err != nil {
		return
	}
	args := url.Values{}
	args.Add("access_token", mc.AccessToken)

	uri += args.Encode()

	params := make(map[string]interface{})
	params["offset"] = offset
	params["count"] = count
	data, err := json.Marshal(params)
	if err != nil {
		return
	}
	body, err = postJSONBody(uri, data)

	return
}

// TemplateSend /cgi-bin/message/wxopen/template/send
func (mc *MiniClient) TemplateSend(template MiniTemplateMessage) (res Response, err error) {
	uri := BaseURL + "/cgi-bin/message/wxopen/template/send?"

	if mc.AccessToken, err = mc.getToken(); err != nil {
		return
	}
	args := url.Values{}
	args.Add("access_token", mc.AccessToken)

	uri += args.Encode()
	data, err := json.Marshal(template)
	if err != nil {
		return
	}
	res, err = postJSON(uri, data)

	return
}

// UniformSend /cgi-bin/message/wxopen/template/uniform_send
func (mc *MiniClient) UniformSend(template MiniUniformMessage) (res Response, err error) {
	uri := BaseURL + "/cgi-bin/message/wxopen/template/uniform_send?"

	if mc.AccessToken, err = mc.getToken(); err != nil {
		return
	}
	args := url.Values{}
	args.Add("access_token", mc.AccessToken)

	uri += args.Encode()
	data, err := json.Marshal(template)
	if err != nil {
		return
	}
	res, err = postJSON(uri, data)

	return
}