package tasksch

import (
	"encoding/json"
	"fmt"
	"strings"
	"sync"
	"time"

	"git.rosy.net.cn/baseapi/platformapi/dingdingapi"
	"git.rosy.net.cn/baseapi/utils"
	"git.rosy.net.cn/jx-callback/business/jxutils/ddmsg"
	"git.rosy.net.cn/jx-callback/business/jxutils/jxcontext"
	"git.rosy.net.cn/jx-callback/globals"
)

const (
	TaskStatusBegin     = 0
	TaskStatusWorking   = 0
	TaskStatusCanceling = 1

	TaskStatusEndBegin = 2
	TaskStatusFinished = 2
	TaskStatusCanceled = 3
	TaskStatusFailed   = 4
	TaskStatusEnd      = 4
)

const (
	MaxTaskNameLen = 50
)

var (
	TaskStatusName = map[int]string{
		TaskStatusWorking:   "运行中",
		TaskStatusCanceling: "取消中",
		TaskStatusFinished:  "结束",
		TaskStatusCanceled:  "已取消",
		TaskStatusFailed:    "失败",
	}
)

type TaskList []ITask

type ITask interface {
	Run()
	GetID() string
	GetResult(duration time.Duration) (retVal []interface{}, err error)
	Cancel()
	GetTotalItemCount() int
	GetFinishedItemCount() int
	GetTotalJobCount() int
	GetFinishedJobCount() int
	GetStatus() int
	GetCreatedAt() time.Time
	GetCreatedBy() string

	AddChild(task ITask) ITask
	GetChildren() TaskList
	SetParent(parentTask ITask)
	// GetOriginalErr() error
	GetErr() error
	// GetDetailErrList() []error
	GetLeafResult() (finishedItemCount, failedItemCount int)
	AddBatchErr(err error)
	AddFailedList(failedList ...interface{})
	GetFailedList() (failedList []interface{})
	SetFinishHook(func(task ITask))
	json.Marshaler
}

// type TaskError struct {
// 	name   string
// 	errStr string
// }

// func (t *TaskError) MarshalJSON() ([]byte, error) {
// 	return json.Marshal(t.Error())
// }

// func (t *TaskError) Error() string {
// 	return fmt.Sprintf("[%s], 错误:%s", t.name, t.errStr)
// }

// func (t *TaskError) String() string {
// 	return t.Error()
// }

// func NewTaskError(name string, err error) *TaskError {
// 	return &TaskError{
// 		name:   name,
// 		errStr: err.Error(),
// 	}
// }

type BaseTask struct {
	Name                string    `json:"name"`
	ID                  string    `json:"id"`
	ParallelCount       int       `json:"parallelCount"`
	BatchSize           int       `json:"batchSize"`
	IsContinueWhenError bool      `json:"isContinueWhenError"`
	CreatedBy           string    `json:"createdBy"`
	CreatedAt           time.Time `json:"createdAt"`
	UpdatedAt           time.Time `json:"updatedAt"`
	TerminatedAt        time.Time `json:"terminatedAt"`
	TotalItemCount      int       `json:"totalItemCount"`
	TotalJobCount       int       `json:"totalJobCount"`
	FinishedItemCount   int       `json:"finishedItemCount"`
	FinishedJobCount    int       `json:"finishedJobCount"`
	FailedItemCount     int       `json:"failedItemCount"`
	FailedJobCount      int       `json:"failedJobCount"`
	Status              int       `json:"status"`

	NoticeMsg string `json:"noticeMsg"`

	Result   []interface{} `json:"-"`
	Children TaskList      `json:"children"`
	Err      string        `json:"err"`

	mainErr      error
	batchErrList []error

	finishChan chan struct{}
	C          <-chan struct{} `json:"-"`
	params     []interface{}
	quitChan   chan int

	locker sync.RWMutex
	parent ITask

	ctx               *jxcontext.Context
	isGetResultCalled bool
	FailedList        []interface{}
	finishHook        func(task ITask)
}

func (s TaskList) Len() int {
	return len(s)
}

func (s TaskList) Less(i, j int) bool {
	return s[i].GetCreatedAt().Sub(s[j].GetCreatedAt()) > 0
}

func (s TaskList) Swap(i, j int) {
	tmp := s[i]
	s[i] = s[j]
	s[j] = tmp
}

func (t *BaseTask) Init(parallelCount, batchSize int, isContinueWhenError bool, params []interface{}, name string, ctx *jxcontext.Context, totalItemCount, totalJobCount int) {
	t.ID = utils.GetUUID()
	t.ParallelCount = parallelCount
	t.BatchSize = batchSize
	t.IsContinueWhenError = isContinueWhenError
	t.params = params
	t.Name = utils.LimitUTF8StringLen(name, MaxTaskNameLen)
	t.CreatedAt = time.Now()
	t.ctx = ctx
	t.CreatedBy = ctx.GetUserName()
	t.UpdatedAt = t.CreatedAt
	t.TerminatedAt = utils.DefaultTimeValue
	t.TotalItemCount = totalItemCount
	t.TotalJobCount = totalJobCount
	t.quitChan = make(chan int)
	t.finishChan = make(chan struct{})
	t.Status = TaskStatusWorking

	t.C = t.finishChan
}

func (t *BaseTask) GetID() string {
	return t.ID
}

func (t *BaseTask) Run() {
}

// 此函数成功返回结果后，结果在任务中会被删除（以免被管理的任务不必要的HOLD住对象）
func (t *BaseTask) GetResult(duration time.Duration) (retVal []interface{}, err error) {
	if t.GetStatus() >= TaskStatusEndBegin {
		return t.getResult(), t.GetErr()
	}
	if duration == 0 {
		duration = time.Hour * 10000 // duration为0表示无限等待
	}
	timer := time.NewTimer(duration)
	select {
	case <-t.finishChan:
		t.isGetResultCalled = true
		timer.Stop()
		return t.getResult(), t.GetErr()
	case <-timer.C:
	}
	return nil, ErrTaskNotFinished
}

func (t *BaseTask) GetCreatedAt() time.Time {
	return t.CreatedAt
}

func (t *BaseTask) GetCreatedBy() string {
	return t.CreatedBy
}

func (t *BaseTask) Cancel() {
	t.locker.Lock()
	if t.Status < TaskStatusEndBegin && t.Status != TaskStatusCanceling {
		t.Status = TaskStatusCanceling
		close(t.quitChan)
	}
	t.locker.Unlock()

	children := t.GetChildren()
	for _, subTask := range children {
		subTask.Cancel()
	}
}

func (t *BaseTask) GetTotalItemCount() int {
	return t.TotalItemCount
}

func (t *BaseTask) GetFinishedItemCount() int {
	t.locker.RLock()
	defer t.locker.RUnlock()

	return t.FinishedItemCount
}

func (t *BaseTask) GetTotalJobCount() int {
	return t.TotalJobCount
}

func (t *BaseTask) GetFinishedJobCount() int {
	t.locker.RLock()
	defer t.locker.RUnlock()

	return t.FinishedJobCount
}

func (t *BaseTask) GetStatus() int {
	t.locker.RLock()
	defer t.locker.RUnlock()

	return t.Status
}

func (t *BaseTask) AddChild(task ITask) ITask {
	t.locker.Lock()
	defer t.locker.Unlock()

	t.Children = append(t.Children, task)
	return task
}

func (t *BaseTask) GetChildren() (children TaskList) {
	t.locker.RLock()
	defer t.locker.RUnlock()

	if len(t.Children) > 0 {
		children = make(TaskList, len(t.Children))
		copy(children, t.Children)
	}
	return children
}

func (t *BaseTask) SetParent(parentTask ITask) {
	t.locker.Lock()
	defer t.locker.Unlock()

	if t.parent != nil {
		panic(fmt.Sprintf("task:%s already have parent!", utils.Format4Output(t, false)))
	}
	t.parent = parentTask
}

func (t *BaseTask) SetNoticeMsg(noticeMsg string) {
	t.locker.Lock()
	defer t.locker.Unlock()
	t.NoticeMsg = noticeMsg
}

func (t *BaseTask) GetNoticeMsg() string {
	t.locker.RLock()
	defer t.locker.RUnlock()
	return t.NoticeMsg
}

func (t *BaseTask) getResult() (result []interface{}) {
	t.locker.Lock()
	defer t.locker.Unlock()
	result = t.Result
	t.Result = nil
	return result
}

func (t *BaseTask) AddBatchErr(err error) {
	if err != nil {
		t.locker.Lock()
		defer t.locker.Unlock()
		t.batchErrList = append(t.batchErrList, err)
	}
}

// func (t *BaseTask) GetOriginalErr() error {
// 	t.locker.RLock()
// 	defer t.locker.RUnlock()
// 	return nil
// }

func (t *BaseTask) GetErr() error {
	t.locker.RLock()
	defer t.locker.RUnlock()
	if t.mainErr == nil && len(t.batchErrList) == 0 {
		return nil
	}
	return t
}

func (t *BaseTask) GetLeafResult() (finishedItemCount, failedItemCount int) {
	if len(t.Children) == 0 {
		return t.FinishedItemCount, t.FailedItemCount
	}
	for _, v := range t.Children {
		subFinishedItemCount, subFailedItemCount := v.GetLeafResult()
		finishedItemCount += subFinishedItemCount
		failedItemCount += subFailedItemCount
	}
	return finishedItemCount, failedItemCount
}

func (t *BaseTask) Error() (errMsg string) {
	if t.GetErr() == nil {
		return ""
	}
	t.locker.RLock()
	errMsg = t.Err
	t.locker.RUnlock()
	if errMsg != "" {
		return errMsg
	}
	errMsg = "任务:" + t.Name
	if t.parent == nil {
		finishedItemCount, failedItemCount := t.GetLeafResult()
		errMsg += fmt.Sprintf(", 全部总共:%d, 成功:%d, 失败:%d,\n", (finishedItemCount + failedItemCount), finishedItemCount, failedItemCount)
	}
	if t.mainErr != nil {
		errMsg += "失败"
		errMsg += "," + t.mainErr.Error()
	} else {
		errMsg += fmt.Sprintf("部分失败, 总共:%d, 成功:%d, 失败:%d, 详情如下:\n", t.TotalItemCount, t.FinishedItemCount, t.FailedItemCount)
		strList := make([]string, len(t.batchErrList))
		for k, v := range t.batchErrList {
			strList[k] = v.Error()
		}
		errMsg += strings.Join(strList, ",\n")
	}
	t.locker.Lock()
	t.Err = errMsg
	t.locker.Unlock()
	return errMsg
}

func (t *BaseTask) SetFinishHook(hook func(task ITask)) {
	t.locker.RLock()
	defer t.locker.RUnlock()
	t.finishHook = hook
}

func (t *BaseTask) GetFailedList() (failedList []interface{}) {
	t.locker.RLock()
	failedList = append(failedList, t.FailedList...)
	t.locker.RUnlock()

	for _, v := range t.Children {
		failedList = append(failedList, v.GetFailedList()...)
	}
	return failedList
}

func (t *BaseTask) AddFailedList(failedList ...interface{}) {
	if len(failedList) > 0 {
		t.locker.Lock()
		defer t.locker.Unlock()
		t.FailedList = append(t.FailedList, failedList...)
	}
}

// func (t *BaseTask) GetDetailErrList() []error {
// 	t.locker.RLock()
// 	defer t.locker.RUnlock()
// 	return t.batchErrList
// }

func AddChild(parentTask ITask, task ITask) ITask {
	if parentTask != nil {
		return parentTask.AddChild(task)
	}
	return task
}

func HandleTask(task, parentTask ITask, isMangeIt bool) ITask {
	AddChild(parentTask, task)
	if parentTask == nil && isMangeIt {
		ManageTask(task)
	}
	return task
}

/////////

func (t *BaseTask) MarshalJSON() ([]byte, error) {
	type tBaseTask BaseTask
	t.locker.RLock()
	defer t.locker.RUnlock()
	return utils.MustMarshal((*tBaseTask)(t)), nil
}

func (t *BaseTask) run(taskHandler func()) {
	if t.GetStatus() == TaskStatusBegin {
		utils.CallFuncAsync(func() {
			taskHandler()

			task := t
			task.locker.Lock()
			if task.mainErr != nil { // 如果有错误，肯定就是失败了
				task.Status = TaskStatusFailed
			} else {
				if task.FinishedJobCount+task.FailedJobCount < task.TotalJobCount {
					task.mainErr = ErrTaskIsCanceled
					task.Status = TaskStatusCanceled
				} else {
					task.Status = TaskStatusFinished
				}
			}
			task.TerminatedAt = time.Now()
			task.locker.Unlock()
			task.Error()
			globals.SugarLogger.Debugf("Task:%s, mainErr:%v, batchErrList:%v", task.Name, task.mainErr, task.batchErrList)

			select {
			case <-t.quitChan:
			default:
				close(t.quitChan)
			}
			// todo 如下代码可能有对t.Children操作的并发问题
			for _, subTask := range t.Children {
				if _, err := subTask.GetResult(0); err != nil {
					globals.SugarLogger.Infof("BaseTask run, failed with error:%v", err)
				}
			}
			close(t.finishChan)
			if t.finishHook != nil {
				t.finishHook(t)
			} else {
				SendMessage(t)
			}
		})
	}
}

func SendMessage(t *BaseTask) {
	time.Sleep(10 * time.Millisecond) // 等待GetResult中的isGetResultCalled赋值
	globals.SugarLogger.Debugf("BaseTask task ID:%s, name:%s finished, isGetResultCalled:%t", t.ID, t.Name, t.isGetResultCalled)
	if !t.isGetResultCalled && t.parent == nil && len(GetTasks(t.ID, TaskStatusBegin, TaskStatusEnd, 24, "")) > 0 {
		if authInfo, err := t.ctx.GetV2AuthInfo(); err == nil { // 这里应该是不管登录类型，直接以可能的方式发消息
			var content string
			taskDesc := fmt.Sprintf("你的异步任务[%s],ID[%s],开始于:%s,结束于:%s,", t.Name, t.ID, utils.Time2Str(t.CreatedAt), utils.Time2Str(t.TerminatedAt))
			content = fmt.Sprintf("%s执行%s", taskDesc, TaskStatusName[t.Status])
			if t.Error() == "" {
				noticeMsg := t.GetNoticeMsg()
				if noticeMsg != "" {
					content += ",通知消息:" + noticeMsg
				}
			} else {
				content += ",\n" + t.Error()
			}
			ddmsg.SendUserMessage(dingdingapi.MsgTyeText, authInfo.UserID, "异步任务完成", content)
		}
	}
}

// successCount表示在返回错误的情况下，（部分）成功的个数，如果没有返回错误，则successCount无意义
func (t *BaseTask) finishedOneJob(itemCount, successCount int, err error) {
	t.locker.Lock()
	defer t.locker.Unlock()

	t.UpdatedAt = time.Now()
	if err == nil {
		t.FinishedItemCount += itemCount
		t.FinishedJobCount++
	} else {
		t.FinishedItemCount += successCount
		t.FailedItemCount += itemCount - successCount
		t.FailedJobCount++
	}
}

func (t *BaseTask) setStatus(status int) {
	t.locker.Lock()
	defer t.locker.Unlock()

	t.Status = status
}

// func (t *BaseTask) buildTaskErrFromBatchErrList() (err error) {
// 	if len(t.batchErrList) > 0 {
// 		strList := make([]string, len(t.batchErrList))
// 		for k, v := range t.batchErrList {
// 			strList[k] = v.Error()
// 		}
// 		return NewTaskError(t.Name, fmt.Errorf("总共:%d, 成功:%d, 失败:%d, 详情:\n%s", t.TotalItemCount, t.FinishedItemCount, t.FailedItemCount, strings.Join(strList, "\n")))
// 	}
// 	return nil
// }

func (task *BaseTask) callWorker(worker func() (retVal interface{}, err error)) (retVal interface{}, err error) {
	defer func() {
		if r := recover(); r != nil {
			globals.SugarLogger.Errorf("callWorker panic:%v", r)
			err = fmt.Errorf("panic, r:%v", r)
		}
	}()
	return worker()
}

func (task *BaseTask) callWorker2(worker func() (retVal interface{}, successCount int, err error)) (retVal interface{}, successCount int, err error) {
	defer func() {
		if r := recover(); r != nil {
			globals.SugarLogger.Errorf("callWorker panic:%v", r)
			err = fmt.Errorf("panic, r:%v", r)
		}
	}()
	return worker()
}