package times

import "time"

type Clock interface {
	Now() time.Time
	After(time.Duration) <-chan time.Time
}

type TestClock struct{
	clock test
}

func Sys() Clock {
	return sys{}
}

func Test() TestClock {
	var zero time.Time
	return TestFrom(zero)
}

func TestFrom(t time.Time) TestClock {
	return TestClock{clock: makeTestClock(t)}
}

func (c TestClock) Now() time.Time {
	return c.clock.now()
}

func (c TestClock) After(d time.Duration) <-chan time.Time {
	return c.clock.after(d)
}

// negative pass not allowed
func (c TestClock) Pass(d time.Duration) {
	c.clock.pass(d)
}

// backwards jump not allowed
func (c TestClock) Jump(t time.Time) {
	c.clock.jump(t)
}