package hijricalendar

import (
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestToISODate(t *testing.T) {
	tests := []struct {
		name string
		date time.Time
		want string
	}{
		{
			name: "ramadan 3 1447",
			date: time.Date(2026, 2, 20, 0, 0, 0, 0, time.UTC),
			want: "1447-09-03",
		},
		{
			name: "ramadan 1 1447",
			date: time.Date(2026, 2, 18, 0, 0, 0, 0, time.UTC),
			want: "1447-09-01",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := ToISODate(tt.date)
			require.NotEmpty(t, got)
			assert.Equal(t, tt.want, got)
		})
	}
}

func TestGregorianToIslamicRange(t *testing.T) {
	y, m, d := GregorianToIslamic(2026, 2, 20)
	assert.Positive(t, y)
	assert.GreaterOrEqual(t, m, 1)
	assert.LessOrEqual(t, m, 12)
	assert.GreaterOrEqual(t, d, 1)
	assert.LessOrEqual(t, d, 30)
}