package jalali

import (
	"testing"
	"time"
)

func TestKnownDates(t *testing.T) {
	tests := []struct {
		gregorian string
		jalali    Date
	}{
		{"2024-03-20", Date{1403, 1, 1}},
		{"2025-03-21", Date{1404, 1, 1}},
		{"2026-07-28", Date{1405, 5, 6}},
	}
	for _, tt := range tests {
		g, _ := time.Parse("2006-01-02", tt.gregorian)
		if got := FromTime(g); got != tt.jalali {
			t.Errorf("%s: got %v, want %v", tt.gregorian, got, tt.jalali)
		}
		back := ToGregorian(tt.jalali.Year, tt.jalali.Month, tt.jalali.Day)
		if got := back.Format("2006-01-02"); got != tt.gregorian {
			t.Errorf("%v: got %s, want %s", tt.jalali, got, tt.gregorian)
		}
	}
}

func TestMonthLength(t *testing.T) {
	if got := DaysInMonth(1399, 12); got != 30 {
		t.Fatalf("leap Esfand: got %d, want 30", got)
	}
	if got := DaysInMonth(1400, 12); got != 29 {
		t.Fatalf("regular Esfand: got %d, want 29", got)
	}
}