package startup

import "github.com/julienschmidt/httprouter"

// Pre-defined queues...
var (
	Logger Phase
	// Phase
	PostFlags Phase
	Startup   Phase
	Routes    ParameterizedPhase[*httprouter.Router]
)

type Phase struct {
	items  []func()
	hasRun bool
}

func (q *Phase) Add(initFn ...func()) {
	if q.hasRun {
		panic("Added init function after startup")
	}
	for _, fn := range initFn {
		q.items = append(q.items, fn)
	}
}

func (q *Phase) Run() {
	if q.hasRun {
		panic("Attempted to run init function twice")
	}
	q.hasRun = true
	for _, fn := range q.items {
		fn()
	}
}

type ParameterizedPhase[Param interface{}] struct {
	items  []func(Param)
	hasRun bool
}

func (q *ParameterizedPhase[Param]) Add(initFn ...func(Param)) {
	if q.hasRun {
		panic("Added init function after startup")
	}
	for _, fn := range initFn {
		q.items = append(q.items, fn)
	}
}

func (q *ParameterizedPhase[Param]) Run(param Param) {
	if q.hasRun {
		panic("Attempted to run init function twice")
	}
	q.hasRun = true
	for _, fn := range q.items {
		fn(param)
	}
}