package rootcoord

import (
	"context"
	"time"

	"github.com/milvus-io/milvus/internal/util/timerecord"
	"github.com/milvus-io/milvus/internal/util/typeutil"
)

type task interface {
	GetCtx() context.Context
	SetCtx(context.Context)
	SetTs(ts Timestamp)
	GetTs() Timestamp
	SetID(id UniqueID)
	GetID() UniqueID
	Prepare(ctx context.Context) error
	Execute(ctx context.Context) error
	WaitToFinish() error
	NotifyDone(err error)
	OnEnqueue() error
}

type baseTask struct {
	ctx  context.Context
	core *Core
	done chan error
	ts   Timestamp
	id   UniqueID

	tr       *timerecord.TimeRecorder
	step     typeutil.TaskStep
	queueDur time.Duration
}

func newBaseTask(ctx context.Context, core *Core) baseTask {
	b := baseTask{
		core: core,
		done: make(chan error, 1),
		tr:   timerecord.NewTimeRecorder("ddl request"),
	}
	b.SetCtx(ctx)
	return b
}

func (b *baseTask) SetStep(step typeutil.TaskStep) {
	b.step = step
	switch step {
	case typeutil.TaskStepEnqueue:
		b.queueDur = 0
		b.tr.Record("enqueue done")
	case typeutil.TaskStepPreExecute:
		b.queueDur = b.tr.Record("start to process")
	}
}

func (b *baseTask) SetCtx(ctx context.Context) {
	b.ctx = ctx
}

func (b *baseTask) GetCtx() context.Context {
	return b.ctx
}

func (b *baseTask) SetTs(ts Timestamp) {
	b.ts = ts
}

func (b *baseTask) GetTs() Timestamp {
	return b.ts
}

func (b *baseTask) SetID(id UniqueID) {
	b.id = id
}

func (b *baseTask) GetID() UniqueID {
	return b.id
}

func (b *baseTask) Prepare(ctx context.Context) error {
	b.SetStep(typeutil.TaskStepPreExecute)
	return nil
}

func (b *baseTask) Execute(ctx context.Context) error {
	b.SetStep(typeutil.TaskStepExecute)
	return nil
}

func (b *baseTask) WaitToFinish() error {
	return <-b.done
}

func (b *baseTask) NotifyDone(err error) {
	b.done <- err
}

func (b *baseTask) OnEnqueue() error {
	b.SetStep(typeutil.TaskStepEnqueue)
	return nil
}