package cwclient

import (
	"context"
	"fmt"
	"io/ioutil"
	"log"
	"net"
	"net/http"
	"net/url"
	"os"
	"sync"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
)

func init() {
	log.SetFlags(log.Llongfile | log.LstdFlags)
}

// Callback 发送代理连接获取内容后的回调函数
type Callback struct {
	label string
	hash  string
	Do    func(tid, content string, err error)
}

// Client 客户端
type Client struct {
	chromeProxyAddr string

	register sync.Map

	host string
	port string

	server   *http.Server
	listener net.Listener
	lock     sync.Mutex
}

// Label 区分不同任务类型
type Label struct {
	label string

	conditionJS   string
	conditionlock sync.Mutex

	cli *Client
}

// GetHash 根据label获取hash路径
func (l *Label) GetHash(label string) string {
	if cb, ok := l.cli.register.Load(label); ok {
		return cb.(Callback).hash
	}
	return ""
}

// GetLabel 根据hash获取路径label
func (l *Label) GetLabel(hash string) string {
	if cb, ok := l.cli.register.Load(hash); ok {
		return cb.(Callback).label
	}
	return ""
}

// Open 缓存了Label值. 每次调用少了label传参
func (l *Label) Open(urlstr string) (bodyRes string, ok bool) {
	return l.cli.open(l, urlstr)
}

// SetContentCondition 设置识别到的内容条件. js代码. 必须是一个函数. 命名可以随意. 返回bool
func (l *Label) SetContentCondition(jsScript string) {
	l.conditionlock.Lock()
	defer l.conditionlock.Unlock()
	l.conditionJS = jsScript
}

// SetContentConditionFromFile 设置识别到的内容条件. js代码. 从js文件 必须是一个函数. 命名可以随意. 返回bool
func (l *Label) SetContentConditionFromFile(jsScriptFile string) {
	f, err := os.Open(jsScriptFile)
	if err != nil {
		panic(err)
	}
	data, err := ioutil.ReadAll(f)
	if err != nil {
		panic(err)
	}
	l.conditionlock.Lock()
	defer l.conditionlock.Unlock()
	log.Println(string(data))
	l.conditionJS = string(data)
}

// GetPort Get return port string. default random.
func (cli *Client) GetPort() string {
	return cli.port
}

// SetPort Set port string. before client call connect method
func (cli *Client) SetPort(port string) {
	cli.port = port
}

// GetHost Get return host string
func (cli *Client) GetHost() string {
	return cli.host
}

// SetHost Set host string. default http://127.0.0.1
func (cli *Client) SetHost(host string) {
	cli.host = host
}

// Register 注册基础信息
func (cli *Client) Register(label string, callback func(tid, content string, err error)) *Label {
	cb := Callback{Do: callback, hash: uuid.New().String()}
	if _, ok := cli.register.Load(label); ok {
		log.Panic("label: ", label, " is exists")
	}
	cli.register.Store(label, cb)
	cli.register.Store(cb.hash, cb)
	l := &Label{label: label, cli: cli}
	return l
}

// UnRegister 卸载注册基础信息
func (cli *Client) UnRegister(label string) {
	if cb, ok := cli.register.Load(label); ok {
		cli.register.Delete(label)
		cli.register.Delete(cb.(Callback).hash)
	}
}

// Connect 连接初始化回调端口
func (cli *Client) Connect() {

	cli.lock.Lock()
	defer cli.lock.Unlock()

	if cli.server == nil {

		listener, err := net.Listen("tcp", ":0")
		if err != nil {
			panic(err)
		}
		cli.port = fmt.Sprintf("%d", listener.Addr().(*net.TCPAddr).Port)

		router := gin.Default()
		router.POST("/:label", func(c *gin.Context) {
			label := c.Param("label")
			if f, ok := cli.register.Load(label); ok {
				callback := f.(Callback)
				if tid, ok := c.GetPostForm("taskid"); ok {
					content := c.PostForm("content")
					errorStr := c.PostForm("error")
					var err error = nil
					if errorStr != "" {
						err = fmt.Errorf(errorStr)
					}
					callback.Do(tid, content, err)
				}
			}
		})

		cli.server = &http.Server{
			Addr:    cli.host + ":" + cli.port,
			Handler: router,
		}

		go func() {
			err := cli.server.Serve(listener)
			if err != nil {
				panic(err)
			}
		}()

	} else {
		log.Println("client had connected.")
	}

	// panic(http.Serve(listener, nil))
}

// Disconnect 断开连接
func (cli *Client) Disconnect() {
	err := cli.server.Shutdown(context.Background())
	if err != nil {
		panic(err)
	}
}

// open  请求完url后 调用不同label注册的回调函数. bodyRes 请求后服务器返回的基础信息. 如果不需要debug一般不需要使用.
func (cli *Client) open(label *Label, urlstr string) (bodyRes string, ok bool) {
	// urlstr = "https://playerduo.com/api/playerDuo-service-v2/rip113?lang=en&deviceType=browser"

	if cli.server == nil {
		panic("client is not connect. Client.Connect() ? ")
	}

	if callback, ok := cli.register.Load(label.label); ok {
		data := url.Values{}
		data["url"] = []string{urlstr}
		data["callback"] = []string{cli.host + ":" + cli.port + "/" + callback.(Callback).hash}
		data["label"] = []string{label.label}

		func() {
			label.conditionlock.Lock()
			defer label.conditionlock.Unlock()
			data["content_condition"] = []string{label.conditionJS}
		}()

		resp, err := http.DefaultClient.PostForm(cli.chromeProxyAddr+"/task/put", data)
		if err != nil {
			panic(err)
		}
		bodyRes, err := ioutil.ReadAll(resp.Body)
		if err != nil {
			panic(err)

		}
		return string(bodyRes), true
	}

	log.Printf("label: %s is not exists", label.label)
	return "", false
}

// New 创建Client并初始化
func New(addr string) *Client {
	cli := &Client{}
	cli.chromeProxyAddr = addr
	cli.host = "http://127.0.0.1"
	return cli
}