package wechat

import (
	"fmt"
	"net/url"
	"time"

	"git.chuangxin1.com/cx/myth"
)

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

// NewClient new client
func NewClient(appID, appSecret, token, encodingAESKey string) *Client {
	key := key(appID)
	if v, ok := cache.Load(key); ok {
		return v.(*Client)
	}
	c := &Client{AppID: appID, AppSecret: appSecret, Token: token, EncodingAESKey: encodingAESKey}
	cache.Store(key, c)
	return c
}

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

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

	uri += args.Encode()
	var jq *myth.JSONQuery
	if jq, err = getJSON(uri); err == nil {
		wc.LastTokenTime = now
		var accessToken string
		accessToken, err = jq.String(`access_token`)
		wc.AccessToken = accessToken
		token = wc.AccessToken
		key := key(wc.AppID)
		cache.Store(key, wc)
	}
	return
}

// GetCodeURL get code 授权获取 OpenID URL
// /connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect
// 转向到
// redirect_uri/?code=CODE&state=STATE
func (wc Client) GetCodeURL(redirectURL, state string) (uri string) {
	uri = OpenURL + "/connect/oauth2/authorize?"
	args := url.Values{}
	args.Add("appid", wc.AppID)
	args.Add("redirect_uri", redirectURL)
	args.Add("response_type", "code")
	args.Add("scope", "snsapi_base")
	args.Add("state", state)

	uri += args.Encode()
	uri += "#wechat_redirect"

	return
}

// GetOpenID 获取 OpenID
// /sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code
func (wc Client) GetOpenID(code string) (jq *myth.JSONQuery, err error) {
	uri := BaseURL + "/sns/oauth2/access_token?"

	if wc.AccessToken, err = wc.getToken(); err != nil {
		return
	}
	args := url.Values{}
	args.Add("access_token", wc.AccessToken)
	args.Add("appid", wc.AppID)
	args.Add("secret", wc.AppSecret)
	args.Add("code", code)
	args.Add("grant_type", "authorization_code")

	uri += args.Encode()
	jq, err = getJSON(uri)

	return
}

// GetUserInfo user info
func (wc Client) GetUserInfo(openid string) (info UserInfo, err error) {
	uri := BaseURL + "/cgi-bin/user/info?"

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

	uri += args.Encode()

	var msg myth.HTTPMessage
	msg, err = getBody(uri)
	if err == nil {
		err = msg.JSON(&info)
	}
	return
}

// GetUserList user list
func (wc Client) GetUserList(nextOpenID string) (list UserList, err error) {
	uri := BaseURL + "/cgi-bin/user/get?"

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

	uri += args.Encode()

	var msg myth.HTTPMessage
	msg, err = getBody(uri)
	if err == nil {
		err = msg.JSON(&list)
	}
	return
}

// GetMaterial 永久资料
func (wc Client) GetMaterial(mtype string, offset, count int) (material Material, err error) {
	uri := BaseURL + "/cgi-bin/material/batchget_material?"

	if wc.AccessToken, err = wc.getToken(); err != nil {
		return
	}

	args := url.Values{}
	data := make(map[string]interface{})

	args.Add("access_token", wc.AccessToken)

	data["type"] = mtype
	data["offset"] = offset
	data["count"] = count

	uri += args.Encode()

	var msg myth.HTTPMessage
	msg, err = postJSON(uri, data)
	if err == nil {
		err = msg.JSON(&material)
	}

	return
}

func (wc *Client) getTicket(now int64) (ticket string, err error) {
	var jq *myth.JSONQuery
	if wc.LastTicketTime > 0 {
		if now-wc.LastTokenTime < TokenExpires {
			ticket = wc.Ticket
			return
		}
	}

	args := url.Values{}
	args.Add("access_token", wc.AccessToken)
	args.Add("type", "jsapi")

	uri := BaseURL + "/cgi-bin/ticket/getticket?"
	uri += args.Encode()
	if jq, err = getJSON(uri); err == nil {
		ticket, err = jq.String(`ticket`)
		wc.LastTicketTime = now
		wc.Ticket = ticket

		key := key(wc.AppID)
		cache.Store(key, wc)
	}

	return
}

// GetSignPackage JS 签名
//   uri      当前 URL
//   nonceStr 随机字符串
func (wc Client) GetSignPackage(uri, nonceStr string) (sign SignPackage, err error) {
	if wc.AccessToken, err = wc.getToken(); err != nil {
		return
	}

	var (
		s    string
		unix int64
	)
	unix = time.Now().Unix()
	if wc.Ticket, err = wc.getTicket(unix); err != nil {
		return
	}

	s = `jsapi_ticket=` + wc.Ticket
	s += `&noncestr=` + nonceStr
	s += `&timestamp=` + fmt.Sprintf("%d", unix)
	s += `&url=` + uri

	sign.AppID = wc.AppID
	sign.NonceStr = nonceStr
	sign.Signature = myth.SHA1(s)
	sign.Timestamp = unix
	sign.URL = uri

	return
}

// SendTemplateMessage send template message
// POST /cgi-bin/message/template/send?access_token=ACCESS_TOKEN
func (wc Client) SendTemplateMessage(template TemplateMessage) (jq *myth.JSONQuery, err error) {
	uri := BaseURL + "/cgi-bin/message/template/send?"

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

	uri += args.Encode()

	var msg myth.HTTPMessage
	msg, err = postJSON(uri, template)
	if err == nil {
		jq, err = msg.JSONQuery()
	}
	return
}