package debouncer_test

import (
	"testing"
	"time"

	"git.t-juice.club/torjus/ghettoptt/debouncer"
)

func TestDebouncer(t *testing.T) {
	t.Run("Simple", func(t *testing.T) {
		ch := make(chan bool)
		d := debouncer.New(ch, 200*time.Millisecond)

		go func() {
			ch <- true
			close(ch)
		}()

		if v := <-d.C; v != true {
			t.Errorf("Expected true, got %v", v)
		}
	})
	t.Run("TrueTrueTrueFalse", func(t *testing.T) {
		ch := make(chan bool)
		d := debouncer.New(ch, 200*time.Millisecond)
		go func() {
			ch <- true
			ch <- true
			ch <- true
			ch <- false
			close(ch)
		}()
		if v := <-d.C; v != true {
			t.Errorf("Expected true, got %v", v)
		}
		if v := <-d.C; v != false {
			t.Errorf("Expected false, got %v", v)
		}
	})
	t.Run("Debounce", func(t *testing.T) {
		ch := make(chan bool)
		d := debouncer.New(ch, 200*time.Millisecond)
		go func() {
			ch <- true
			time.Sleep(10 * time.Millisecond)
			ch <- false
			time.Sleep(1 * time.Millisecond)
			ch <- true
			time.Sleep(1 * time.Millisecond)
			ch <- false
			time.Sleep(10 * time.Millisecond)
			close(ch)
		}()
		if v := <-d.C; v != true {
			t.Errorf("Expected first value to be true, got %v", v)
		}
		if v := <-d.C; v != false {
			t.Errorf("Expected second value to be false, got %v", v)
		}

		if v, ok := <-d.C; ok {
			t.Errorf("Expected closed channel, got %v", v)
		}
	})
	t.Run("DebounceDelay", func(t *testing.T) {
		ch := make(chan bool)
		d := debouncer.New(ch, 200*time.Millisecond)
		go func() {
			ch <- true
			ch <- false
			close(ch)
		}()
		start := time.Now()
		if v := <-d.C; v != true {
			t.Errorf("Expected first value to be true, got %v", v)
		}
		if v, ok := <-d.C; v != false || !ok {
			if ok {
				t.Errorf("Expected second value to be false, got %v", v)
			} else {
				t.Error("Unexpected closed channel")
			}
		}
		if duration := time.Since(start); duration < 200*time.Millisecond {
			t.Errorf("Got false too soon: %s", duration)
		}
	})
}