package nnet

import (
	"git.noahlan.cn/noahlan/nnet/conn"
	"git.noahlan.cn/noahlan/nnet/event"
	"git.noahlan.cn/noahlan/nnet/packet"
	rt "git.noahlan.cn/noahlan/nnet/router"
	"git.noahlan.cn/noahlan/ntool/ndef"
	"git.noahlan.cn/noahlan/ntool/npool"
	"github.com/panjf2000/ants/v2"
	"time"
)

type (
	// RunOption defines the method to customize an Engine.
	RunOption func(ngin *Engine)
)

// EventManager returns EventManager.
func (ngin *Engine) EventManager() event.EventManager {
	return ngin.evtMgr
}

// ConnManager returns connection manager
func (ngin *Engine) ConnManager() *conn.ConnManager {
	return ngin.connMgr
}

//////////////////////// Options

func WithMiddleware(middleware ...rt.Middleware) RunOption {
	return func(ngin *Engine) {
		ngin.Use(middleware...)
	}
}

// WithRouter 设置消息路由
func WithRouter(router rt.Router) RunOption {
	return func(ngin *Engine) {
		ngin.router = router
	}
}

// WithNotFoundHandler returns a RunOption with not found handler set to given handler.
func WithNotFoundHandler(handler rt.Handler) RunOption {
	return func(ngin *Engine) {
		ngin.router.SetNotFoundHandler(rt.NotFoundHandler(handler))
	}
}

// WithTimerPrecision 设置Timer精度，需在 Start 或 Dial 之前执行
// 注：精度需大于1ms, 并且不能在运行时更改
// 默认精度是 time.Second
func WithTimerPrecision(precision time.Duration) RunOption {
	if precision < time.Millisecond {
		panic("time precision can not less than a Millisecond")
	}
	return func(ngin *Engine) {
		ngin.TaskTimerPrecision = precision
	}
}

// WithPackerBuilder 设置 消息的封包/解包构造器
func WithPackerBuilder(fn packet.PackerBuilder) RunOption {
	return func(ngin *Engine) {
		ngin.packerBuilder = fn
	}
}

// WithSerializer 设置消息的 序列化/反序列化 方式
func WithSerializer(s ndef.Serializer) RunOption {
	return func(ngin *Engine) {
		ngin.serializer = s
	}
}

// WithPool 设置使用自定义的工作池
func WithPool(pl *ants.Pool) RunOption {
	return func(ngin *Engine) {
		ngin.pool = pl
	}
}

// WithPoolCfg 设置工作池配置
func WithPoolCfg(cfg npool.Config) RunOption {
	return func(ngin *Engine) {
		ngin.pool, _ = ants.NewPool(cfg.PoolSize, ants.WithOptions(cfg.Options()))
	}
}