package matching

// Expected values verified against scripts/match_payments.py on 2026-05-06:
//
//	PYTHONPATH=scripts:. python3 -c '
//	from match_payments import format_date
//	for v in [None, "", 44197, 44197.5, "2026-04-15", "garbage", "  2026-04-15  "]:
//	    print(repr(format_date(v)))
//	'
//
// Output:
//
//	''
//	''
//	'2021-01-01'
//	'2021-01-01'
//	'2026-04-15'
//	'garbage'
//	'2026-04-15'

import "testing"

func TestFormatDate(t *testing.T) {
	t.Parallel()

	cases := []struct {
		name  string
		input any
		want  string
	}{
		{name: "nil", input: nil, want: ""},
		{name: "empty string", input: "", want: ""},
		{name: "serial int", input: int(44197), want: "2021-01-01"},
		{name: "serial float fractional", input: float64(44197.5), want: "2021-01-01"},
		{name: "already formatted", input: "2026-04-15", want: "2026-04-15"},
		{name: "garbage string", input: "garbage", want: "garbage"},
		{name: "padded date string trimmed", input: "  2026-04-15  ", want: "2026-04-15"},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			got := FormatDate(tc.input)
			if got != tc.want {
				t.Errorf("FormatDate(%v) = %q, want %q", tc.input, got, tc.want)
			}
		})
	}
}