package node

import (
	"admin/lib/xlog"
	"fmt"
	"github.com/gin-gonic/gin"
)

// Task 不会永久执行的任务，串行用于启动前初始化或者启动后初始化工作，返回error就停止application
type Task func() error

// Worker 永久执行的工作协程，一旦停止就停止application
type Worker func() error

// Job 不会永久执行的任务，且不关心执行结果，不关心执行顺序，例如内存预热等
type Job func()

type pair struct {
	key   any
	value any
}

// Application 受scheduler调度的最小逻辑单元，有独立的启动参数、各种串行、并行任务
type Application struct {
	Name            string
	bootFlag        interface{}
	initializeTasks []pair // 启动服务前串行执行初始化任务的job
	services        []pair // rpc服务
	servers         []pair // web服务
	postRunTasks    []pair // 启动后串行执行的job
	postRunWorkers  []pair // 启动后后台永久执行的工作协程，一旦推出就停止application
	parallelJobs    []pair // 启动services、servers后并行执行的任务，不关心结果，例如内存数据的预热等
	stopTasks       []pair
}

// newApp
func newApp(name string, options ...AppOption) *Application {
	app := new(Application)
	app.Name = name
	app.applyOptions(options...)
	return app
}

// WithInitializeTask app完成init之后run之前执行的任务，可以用来初始化某些业务或者检查配置等
func (app *Application) WithInitializeTask(desc string, task Task) *Application {
	if task == nil {
		return app
	}
	app.initializeTasks = append(app.initializeTasks, pair{desc, task})
	return app
}

// WithServer 添加web服务器
func (app *Application) WithServer(desc string, addr string) *gin.Engine {
	server := gin.Default()
	app.servers = append(app.servers, pair{desc, pair{addr, server}})
	return server
}

// WithService 添加rpc服务
//func (app *Application) WithService(desc string, service *joyservice.ServicesManager) *Application {
//	if service == nil {
//		return app
//	}
//	app.services = append(app.services, pair{desc, service})
//	return app
//}

// WithPostTask app run之后执行的任务，一般做临时检查任务，可以用来服务启动后加载数据检查等
func (app *Application) WithPostTask(desc string, task Task) *Application {
	if task == nil {
		return nil
	}
	app.postRunTasks = append(app.postRunTasks, pair{desc, task})
	return app
}

// WithPostWorker 完成post task之后执行的后台任务，报错退出等app也会退出，一般做永久的关键后台逻辑
func (app *Application) WithPostWorker(desc string, worker Worker) *Application {
	if worker == nil {
		return app
	}
	app.postRunWorkers = append(app.postRunWorkers, pair{desc, worker})
	return app
}

// WithParallelJob 完成post task之后执行的并行后台任务，一般做永久的不关键后台逻辑，例如内存预热等
func (app *Application) WithParallelJob(desc string, job Job) *Application {
	if job == nil {
		return app
	}
	app.parallelJobs = append(app.parallelJobs, pair{desc, job})
	return app
}

// WithStopTask 注册停服逻辑（只能处理正常停服，异常例如panic、oom会监听不到）
func (app *Application) WithStopTask(desc string, task Task) *Application {
	if task == nil {
		return app
	}
	app.stopTasks = append(app.stopTasks, pair{desc, task})
	return app
}

func (app *Application) GetBootConfig() any {
	return app.bootFlag
}

func (app *Application) applyOptions(options ...AppOption) *Application {
	for _, option := range options {
		option.Apply(app)
	}
	return app
}

func (app *Application) run() (err error) {
	waitChan := make(chan error, 1)

	// 启动前的初始化任务
	for _, j := range app.initializeTasks {
		curErr := j.value.(Task)()
		if curErr != nil {
			err = fmt.Errorf("run initialize task(%s) return error:%v", j.key, curErr)
			return
		}
	}

	// 启动rpc服务
	//for _, pair := range app.services {
	//	go func(desc string, s *joyservice.ServicesManager) {
	//		jlog.Noticef("app %v service %v will listen on %v", app.Name, desc, s.Addr)
	//		curErr := s.Run()
	//		if curErr != nil {
	//			waitChan <- fmt.Errorf("service %s run on %v error:%v", desc, s.Addr, curErr)
	//		} else {
	//
	//		}
	//	}(pair.desc, pair.item.(*joyservice.ServicesManager))
	//}

	//defer app.stopServices()

	// 启动web服务
	for _, server := range app.servers {
		go func(desc string, info pair) {
			addr := info.key.(string)
			engine := info.value.(*gin.Engine)
			xlog.Noticef("app %v server %v will listen on %v", app.Name, desc, addr)
			err := engine.Run(addr)
			if err != nil {
				waitChan <- fmt.Errorf("server %s error:%v", desc, err)
			} else {

			}
		}(server.key.(string), server.value.(pair))
	}

	//defer app.stopServers()

	// 启动后串行执行的job
	for _, j := range app.postRunTasks {
		curErr := j.value.(Task)()
		if curErr != nil {
			err = fmt.Errorf("run post task %s return error:%v", j.key, curErr)
			return
		}
	}

	// 启动后串行执行的工作协程
	for _, worker := range app.postRunWorkers {
		go func(desc string, g Worker) {
			curErr := g()
			if curErr != nil {
				waitChan <- fmt.Errorf("run post worker %s return error:%v", desc, curErr)
			}
		}(worker.key.(string), worker.value.(Worker))
	}

	// 启动后的并行job
	for _, j := range app.parallelJobs {
		go j.value.(Job)()
	}

	xlog.Noticef("application[%v] run ok.", app.Name)

	select {
	case anyErr := <-waitChan:
		xlog.Critif("scheduler stop with execute error:%v", anyErr)
		return anyErr
	}
}

func (app *Application) stop() {
	for _, task := range app.stopTasks {
		err := task.value.(Task)()
		if err != nil {
			xlog.Errorf("app stop, execute %v error:%v", task.key, err)
		} else {
			xlog.Infof("app %v stop, execute task:%v", app.Name, task.key)
		}
	}
	//app.stopServices()
	//app.stopServers()
}

//func (app *Application) stopServers() {
//	for _, s := range app.servers {
//		s.item.(*web.Engine).Stop()
//	}
//}

//func (app *Application) stopServices() {
//	for _, s := range app.services {
//		s.item.(*joyservice.ServicesManager).Stop()
//	}
//}