package main

import (
	"crypto/sha1"
	"encoding/hex"
	"fmt"
	"io/ioutil"
	"math/rand"
	"net/http"
	. "template"

	simplejson "github.com/go-simplejson"
)

//const (
//	CREATEADDR  = "/coinproxy/createaddr"
//	TRANSINFO   = "/coinproxy/query/transinfo"
//	COINBALANCE = "/coinproxy/coinbalance"
//	SENDCOINS   = "/coinproxy/sendcoins"
//)

var handler = map[string]func(w http.ResponseWriter, r *http.Request, js *simplejson.Json, body []byte) int{
	CREATEADDR:  commonFunc,
	TRANSINFO:   commonFunc,
	COINBALANCE: commonFunc,
	SENDCOINS:   commonFunc,
	CHAINHEIGHT: commonFunc,
	LISTUNSPENT: commonFunc,
	RAWTRANSFER: commonFunc,
}

func commonHandler(w http.ResponseWriter, r *http.Request) {

	var ret = 0
	defer func() {
		if ret != 0 {
			errresp := fmt.Sprintf(`{"errcode":%v,"msg":"%v"}`, ret, GetErrMsg(ret, nil))
			w.Write([]byte(errresp))
			log.Error("send resp:%v", errresp)
			return
		}
	}()

	path := r.URL.Path

	defer r.Body.Close()
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		ret = INNER_ERR
		log.Error("err:%s", err.Error())
		return
	}

	log.Debug("read body:%v", string(body))
	js, err := simplejson.NewJson(body)
	if err != nil {
		ret = FORMAT_ERR
		log.Error("err:%s", err.Error())
		return
	}

	timestamp := js.Get("timestamp").MustString()
	signature := js.Get("signature").MustString()

	var ok bool
	if ret, ok = checkPermission(timestamp, signature, []byte(path)); !ok {

		log.Error("check signature err")
		return
	}
	if _, ok := handler[path]; !ok {

		w.WriteHeader(404)
		ret = NO_AUTH
		log.Error("no path,invalid path:%v", path)
		return
	}
	log.Debug("path:%v", path)
	ret = handler[path](w, r, js, body)
	return

}

func commonFunc(w http.ResponseWriter, r *http.Request, js *simplejson.Json, body []byte) int {

	cointype := js.Get("cointype").MustString()
	taskH := NewtaskHandler()

	task := &taskInfo{
		cointype:  cointype,
		jshandler: js,
		urlpath:   r.URL.Path,
		resp:      taskH,
	}

	chanindex := rand.Int31n(100) % int32(CPUNUM)

	taskChan[chanindex] <- task

	resp, err := taskH.waitProcessData()
	if err != nil {

		return TIME_OUT
	}

	w.Write(resp)
	log.Debug("resp write:%v", string(resp))
	return OK
}

func checkSignature(body []byte, timestamp, signature string) bool {

	sha1Contain := sha1.New()
	byteSha1 := append(body, append([]byte(timestamp), []byte("coinsapi^&#@(*33")...)...)
	sha1Contain.Write(byteSha1)
	localSig := hex.EncodeToString(sha1Contain.Sum(nil))
	log.Debug("caculate local signature:%v", localSig)
	return signature == localSig

}

func checkPermission(timestamp, signature string, body []byte) (int, bool) {

	if string(body) != SENDCOINS {
		return OK, true
	}
	if checkSignature(body, timestamp, signature) == false {
		return NO_AUTH, false
	}
	return OK, true
}

////获取入币交易信息
//func transInfo(w http.ResponseWriter, r *http.Request) {

//	var ret = 0
//	defer func() {
//		if ret != 0 {
//			errresp := fmt.Sprintf(`{"errcode":%v,"msg":"%v"}`, ret, GetErrMsg(ret, nil))
//			w.Write([]byte(errresp))
//			return
//		}
//	}()

//	defer r.Body.Close()
//	body, err := ioutil.ReadAll(r.Body)
//	if err != nil {
//		ret = INNER_ERR
//		log.Error("err:%s", err.Error())
//		return
//	}

//	log.Debug("read body:%v", string(body))
//	js, err := simplejson.NewJson(body)
//	if err != nil {
//		ret = FORMAT_ERR
//		log.Error("err:%s", err.Error())
//		return
//	}

//	timestamp := js.Get("timestamp").MustString()
//	signature := js.Get("signature").MustString()
//	cointype := js.Get("cointype").MustString()

//	var ok bool
//	if ret, ok = checkPermission(timestamp, signature, "post", body); !ok {
//		//return
//	}

//	taskH := NewtaskHandler()

//	task := &taskInfo{
//		cointype:  cointype,
//		jshandler: js,
//		urlpath:   r.URL.Path,
//		resp:      taskH,
//	}
//	chanindex := rand.Int31n(100) % int32(CPUNUM)
//	taskChan[chanindex] <- task

//	resp, err := taskH.waitProcessData()
//	if err != nil {
//		ret = TIME_OUT
//		return
//	}

//	w.Write(resp)
//	ret = OK
//	log.Debug("resp write:%v", string(resp))
//	return

//}

//func createAddr(w http.ResponseWriter, r *http.Request) {

//	var ret = 0
//	defer func() {
//		if ret != 0 {
//			errresp := fmt.Sprintf(`{"errcode":%v,"msg":"%v"}`, ret, GetErrMsg(ret, nil))
//			w.Write([]byte(errresp))
//			return
//		}
//	}()

//	defer r.Body.Close()
//	body, err := ioutil.ReadAll(r.Body)
//	if err != nil {
//		ret = INNER_ERR
//		log.Error("err:%s", err.Error())
//		return
//	}

//	js, err := simplejson.NewJson(body)
//	if err != nil {
//		ret = FORMAT_ERR
//		log.Error("err:%s", err.Error())
//		return
//	}

//	timestamp := js.Get("timestamp").MustString()
//	signature := js.Get("signature").MustString()
//	cointype := js.Get("cointype").MustString()

//	var ok bool
//	if ret, ok = checkPermission(timestamp, signature, "post", body); !ok {
//		//return
//		//TODO

//	}

//	taskH := NewtaskHandler()

//	task := &taskInfo{
//		cointype:  cointype,
//		jshandler: js,
//		urlpath:   r.URL.Path,
//		resp:      taskH,
//	}
//	chanindex := rand.Int31n(100) % int32(CPUNUM)
//	taskChan[chanindex] <- task

//	resp, err := taskH.waitProcessData()
//	if err != nil {
//		ret = TIME_OUT
//		return
//	}

//	w.Write(resp)
//	ret = OK
//	return
//}