package magnet

import "testing"

func TestParse(t *testing.T) {
	tests := []struct {
		name     string
		raw      string
		infohash string
		dn       string
		trackers int
	}{
		{
			name:     "btih hex (из BRIEF)",
			raw:      "magnet:?xt=urn:btih:541ADCFF3B6DD5DBA7088EA83317D9D6FAC331D6&tr=http%3A%2F%2Fbt.t-ru.org%2Fann%3Fmagnet&dn=rutracker-topic-6514485",
			infohash: "541adcff3b6dd5dba7088ea83317d9d6fac331d6",
			dn:       "rutracker-topic-6514485",
			trackers: 1,
		},
		{
			name:     "btih base32 (20 нулевых байт)",
			raw:      "magnet:?xt=urn:btih:AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
			infohash: "0000000000000000000000000000000000000000",
		},
		{
			name:     "btmh v2 sha256",
			raw:      "magnet:?xt=urn:btmh:12200123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef",
			infohash: "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef",
		},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			got, err := Parse(tc.raw)
			if err != nil {
				t.Fatalf("Parse: %v", err)
			}
			if got.Infohash != tc.infohash {
				t.Errorf("infohash = %q, want %q", got.Infohash, tc.infohash)
			}
			if got.DisplayName != tc.dn {
				t.Errorf("dn = %q, want %q", got.DisplayName, tc.dn)
			}
			if len(got.Trackers) != tc.trackers {
				t.Errorf("trackers = %d, want %d", len(got.Trackers), tc.trackers)
			}
		})
	}
}

func TestParseErrors(t *testing.T) {
	cases := []string{
		"https://example.com/file.torrent", // не magnet
		"magnet:?dn=no-infohash",           // нет xt
		"magnet:?xt=urn:btih:zzzz",         // некорректный hash
		"",                                 // пусто
	}
	for _, raw := range cases {
		if _, err := Parse(raw); err == nil {
			t.Errorf("Parse(%q): ожидалась ошибка", raw)
		}
	}
}

func TestParseNormalisesCase(t *testing.T) {
	lower := "magnet:?xt=urn:btih:541adcff3b6dd5dba7088ea83317d9d6fac331d6"
	upper := "magnet:?xt=urn:btih:541ADCFF3B6DD5DBA7088EA83317D9D6FAC331D6"
	a, err := Parse(lower)
	if err != nil {
		t.Fatal(err)
	}
	b, err := Parse(upper)
	if err != nil {
		t.Fatal(err)
	}
	if a.Infohash != b.Infohash {
		t.Errorf("регистр влияет: %q != %q", a.Infohash, b.Infohash)
	}
}