package main

import "testing"

func TestCompletePersists(t *testing.T) {
	store := NewStore()
	task := store.Add("write report")
	if err := store.Complete(task.ID); err != nil {
		t.Fatalf("Complete(%d) returned error: %v", task.ID, err)
	}
	got, ok := store.Get(task.ID)
	if !ok {
		t.Fatalf("task %d disappeared from the store", task.ID)
	}
	if !got.Done {
		t.Fatalf("task %d should be done after Complete, but Done is false", task.ID)
	}
}

func TestCompleteUnknownIDReturnsError(t *testing.T) {
	store := NewStore()
	store.Add("write report")
	if err := store.Complete(99); err == nil {
		t.Fatal("Complete(99) should return an error for a missing id")
	}
}

func TestTitleWidthCountsCharacters(t *testing.T) {
	task := Task{Title: "café menu"}
	if w := task.TitleWidth(); w != 9 {
		t.Fatalf("TitleWidth(%q) = %d, want 9 (characters, not bytes)", task.Title, w)
	}
}

func TestParseIDRejectsGarbage(t *testing.T) {
	if _, err := ParseID("abc"); err == nil {
		t.Fatal(`ParseID("abc") should return an error, got nil`)
	}
}

func TestParseIDAcceptsNumbers(t *testing.T) {
	id, err := ParseID("42")
	if err != nil {
		t.Fatalf(`ParseID("42") returned error: %v`, err)
	}
	if id != 42 {
		t.Fatalf(`ParseID("42") = %d, want 42`, id)
	}
}