package lexicon

import "testing"

// TestClosedSetsAreComplete — the point of the package. A closed class can be
// finished, so the test names the members that were MISSING from the inline Go
// lists this package replaced (Vikunja #525) and every one of them has to be
// there. Add to this list when a form turns up unhandled.
func TestClosedSetsAreComplete(t *testing.T) {
	inter := map[string]bool{}
	for _, w := range Interrogatives() {
		inter[w] = true
	}
	// Instrumental and prepositional cases of что and кто, and the declined
	// какой. The old list had что/чего and nothing else, so "чем ты занята" and
	// "в каком часу" carried no interrogative at all.
	for _, w := range []string{"чем", "чём", "чему", "кем", "ком", "каком", "какими", "насколько"} {
		if !inter[w] {
			t.Errorf("interrogatives is missing %q", w)
		}
	}

	for _, tc := range []struct {
		word string
		want int
	}{
		{"ноль", 0}, {"одна", 1}, {"две", 2}, {"одиннадцать", 11},
		{"пятнадцать", 15}, {"двадцать", 20}, {"сорок", 40}, {"девяносто", 90},
		{"сто", 100}, {"twelve", 12},
	} {
		got, ok := Cardinal(tc.word)
		if !ok || got != tc.want {
			t.Errorf("Cardinal(%q) = %d, %v; want %d, true", tc.word, got, ok, tc.want)
		}
	}
	if _, ok := Cardinal("бэкап"); ok {
		t.Error("Cardinal must not answer for a word that is not a number")
	}
}

// TestDayOffsetHasNoOrderingTrap — the defect a lookup removes. The callers this
// replaced used strings.Contains in a switch, so "послезавтра" had to be tested
// before "завтра" by hand or the day after tomorrow read as tomorrow.
func TestDayOffsetHasNoOrderingTrap(t *testing.T) {
	for _, tc := range []struct {
		text string
		want int
		ok   bool
	}{
		{"послезавтра", 2, true},
		{"завтра", 1, true},
		{"сегодня", 0, true},
		{"вчера", -1, true},
		{"позавчера", -2, true},
		{"встреча послезавтра в 14:30", 2, true},
		{"Tomorrow at 09:00", 1, true},
		{"не сегодня, а послезавтра", 2, true},
		{"в четверг", 0, false},
		{"завтраком", 0, false},
	} {
		got, ok := DayOffsetIn(tc.text)
		if ok != tc.ok || (ok && got != tc.want) {
			t.Errorf("DayOffsetIn(%q) = %d, %v; want %d, %v", tc.text, got, ok, tc.want, tc.ok)
		}
	}
	// "сегодня" is offset 0, which is also the zero value, so the second return
	// is the only thing that separates a hit from a miss.
	if n, ok := DayOffset("сегодня"); n != 0 || !ok {
		t.Errorf("DayOffset(сегодня) = %d, %v; want 0, true", n, ok)
	}
}

// TestIndexedSetsLineUpWithTheirCallers — weekdays start at Sunday because Go's
// time.Weekday does, and months are 1-indexed so a month number needs no
// arithmetic. Off-by-one here is a wrong date spoken out loud.
func TestIndexedSetsLineUpWithTheirCallers(t *testing.T) {
	if got := Weekday(0); got != "воскресенье" {
		t.Errorf("Weekday(0) = %q, want воскресенье", got)
	}
	if got := Weekday(1); got != "понедельник" {
		t.Errorf("Weekday(1) = %q, want понедельник", got)
	}
	if got := MonthGenitive(1); got != "января" {
		t.Errorf("MonthGenitive(1) = %q, want января", got)
	}
	if got := MonthGenitive(12); got != "декабря" {
		t.Errorf("MonthGenitive(12) = %q, want декабря", got)
	}
	if got := MonthGenitive(0); got != "" {
		t.Errorf("MonthGenitive(0) = %q, want the empty slot", got)
	}
	if got := HourSpoken(23); got != "двадцать три" {
		t.Errorf("HourSpoken(23) = %q, want двадцать три", got)
	}
	for _, i := range []int{-1, 7, 13, 24} {
		if got := Weekday(i); i >= 7 && got != "" {
			t.Errorf("Weekday(%d) = %q, want empty", i, got)
		}
	}
	if got := HourSpoken(24); got != "" {
		t.Errorf("HourSpoken(24) = %q, want empty", got)
	}
}

// TestCallerCannotEditTheLexicon — the sets are handed out as copies. A caller
// that sorted the slice it was given would otherwise reorder weekdays for
// everybody.
func TestCallerCannotEditTheLexicon(t *testing.T) {
	first := Interrogatives()
	first[0] = "мутировало"
	if again := Interrogatives(); again[0] == "мутировало" {
		t.Fatal("the lexicon handed out its own backing array")
	}
}