package event

import (
	"sync"
	"time"

	"gitee.com/timedb/wheatCache/pkg/errorx"
)

type Active func() ([]string, error) // 事件带函数

type Event struct {
	msgCtx      map[string]interface{}
	eventName   string
	WorkTime    time.Duration     // 工作时间
	msg         map[string]string // 消息
	waitResult  chan interface{}  // 等待返回
	err         error
	ru          sync.RWMutex
	muClose     sync.Mutex //关闭锁
	eventStatus eventType
}

func (e *Event) SetMsg(key string, val string) {
	e.ru.Lock()
	defer e.ru.Unlock()
	if e.msg == nil {
		e.msg = make(map[string]string)
	}
	e.msg[key] = val
}

func (e *Event) GetMsg(key string) string {
	e.ru.RLock()
	defer e.ru.RUnlock()
	return e.msg[key]
}

func (e *Event) GetEventName() string {
	return e.eventName
}

// SetValue 写入 ctx 传递用参数
func (e *Event) SetValue(key string, value interface{}) {
	e.ru.Lock()
	defer e.ru.Unlock()
	if e.msgCtx == nil {
		e.msgCtx = make(map[string]interface{})
	}
	e.msgCtx[key] = value
}

func (e *Event) GetValue(key string) (interface{}, bool) {
	e.ru.RLock()
	defer e.ru.RUnlock()
	val, ok := e.msgCtx[key]
	return val, ok
}

func (e *Event) SetErr(err error) {
	e.err = err
}

// InitWaitEvent 初始化 wait event 必须调用才拥有等待特性
func (e *Event) InitWaitEvent() {
	e.muClose.Lock()
	defer e.muClose.Unlock()
	e.waitResult = make(chan interface{})
	e.eventStatus = waitEventState
}

// StartWaitEvent 开始一个等待任务
func (e *Event) StartWaitEvent(ttl time.Duration) (interface{}, error) {
	t := time.NewTimer(ttl)
	select {
	case <-t.C:
		e.muClose.Lock()
		defer e.muClose.Unlock()
		if e.eventStatus == workEventState {
			return <-e.waitResult, e.err
		}

		e.eventStatus = closeEventState
		return nil, errorx.TimeOutErr()

	case result := <-e.waitResult:
		return result, e.err
	}
}

func (e *Event) ExecWorkAndSendResult(work EventWorkFunc) (interface{}, error) {
	e.muClose.Lock()
	defer e.muClose.Unlock()
	if e.eventStatus != waitEventState {
		return nil, errorx.New("not wait status, exec err")
	}

	e.eventStatus = workEventState

	res, err := work()
	e.waitResult <- res
	e.err = err

	close(e.waitResult)
	e.eventStatus = closeEventState
	return res, err
}

func NewEvent(eventName string) *Event {
	return &Event{
		eventName:   eventName,
		eventStatus: defaultEventState,
	}
}

type Driver struct {
	maxQueueSize int
	queue        chan *Event
}

// Get 获取驱动
func (d *Driver) Get() *Event {
	return <-d.queue
}

func (d *Driver) Put(event *Event) {
	d.queue <- event
}

// NewDriver 新建 Driver
func NewDriver(maxSize int) DriverInterface {
	return &Driver{
		maxQueueSize: maxSize,
		queue:        make(chan *Event, maxSize),
	}
}