package importer

import (
	"fmt"
	"path/filepath"
	"strings"
	"testing"
)

var ram = Want{GroupMBID: "rg-ram", ArtistMBID: "mb-dp", Artist: "Daft Punk", Title: "Random Access Memories",
	Year: 2013, PrimaryType: "Album"}

var ramTitles = []string{"Give Life Back to Music", "The Game of Love", "Giorgio by Moroder", "Within",
	"Instant Crush", "Lose Yourself to Dance", "Touch", "Get Lucky", "Beyond", "Motherboard",
	"Fragments of Time", "Doin' It Right", "Contact"}

// edition is RAM's 13-track CD, recordings rec-01.., lengths 4:00 + n seconds.
func edition(mbid string, n int) Edition {
	e := Edition{MBID: mbid, Title: "Random Access Memories", Status: "Official", Date: "2013-05-17"}
	for i := range n {
		e.Tracks = append(e.Tracks, Track{Medium: 1, Format: "CD", Position: i + 1, Title: ramTitles[i%len(ramTitles)],
			RecordingMBID: fmt.Sprintf("rec-%02d", i+1), LengthMs: 240000 + i*1000})
	}
	return e
}

// download is n files lined up with the edition: tagged positions, lengths
// within a second, AcoustID naming each file's recording.
func download(n int) []File {
	var fs []File
	for i := range n {
		fs = append(fs, File{Path: fmt.Sprintf("/dl/%02d.flac", i+1), Rel: fmt.Sprintf("%02d.flac", i+1),
			Disc: 1, Track: i + 1, Title: ramTitles[i%len(ramTitles)], Album: "Random Access Memories",
			LengthMs: 240000 + i*1000 + 400, Recordings: []string{fmt.Sprintf("rec-%02d", i+1)}})
	}
	return fs
}

func TestVerify_TheAlbumAndWhatIsNot(t *testing.T) {
	eds := []Edition{edition("rel-cd", 13), edition("rel-deluxe", 15)}
	cases := []struct {
		name    string
		files   func() []File
		printed bool
		out     Outcome
		code    string
		edition string
	}{
		{"the album, fingerprinted", func() []File { return download(13) }, true, Accept, CodeMatched, "rel-cd"},
		{"the deluxe by count", func() []File { return download(15) }, true, Accept, CodeMatched, "rel-deluxe"},
		{"no audio", func() []File { return nil }, true, Refuse, CodeNoAudio, ""},
		{"music videos", func() []File {
			fs := download(13)
			for i := range fs {
				fs[i].Video = i < 10
			}
			return fs
		}, true, Refuse, CodeVideo, ""},
		{"tags name another group", func() []File {
			fs := download(13)
			for i := range fs {
				fs[i].GroupMBID = "rg-homework"
			}
			return fs
		}, true, Refuse, CodeWrongAlbum, ""},
		{"fingerprints say other recordings", func() []File {
			fs := download(13)
			for i := range fs {
				fs[i].Recordings = []string{"rec-other"}
			}
			return fs
		}, true, Refuse, CodeWrongAlbum, "rel-cd"},
		{"the drumless edition: right lengths, album tag says otherwise", func() []File {
			fs := download(13)
			for i := range fs {
				fs[i].Recordings, fs[i].Album = nil, "Random Access Memories (Drumless Edition)"
			}
			return fs
		}, false, Refuse, CodeOtherVersion, "rel-cd"},
		{"fewer files than any edition", func() []File { return download(9) }, true, Refuse, CodeIncomplete, ""},
		{"no edition this long", func() []File { return download(14) }, true, Review, CodeNoEdition, ""},
		{"no fingerprints, lengths and titles agree", func() []File {
			fs := download(13)
			for i := range fs {
				fs[i].Recordings = nil
			}
			return fs
		}, false, Accept, CodeMatched, "rel-cd"},
		{"no fingerprints, no titles, nothing to go on but lengths", func() []File {
			fs := download(13)
			for i := range fs {
				fs[i].Recordings, fs[i].Title, fs[i].Album = nil, "", ""
			}
			return fs
		}, false, Review, CodeWeak, "rel-cd"},
		{"no fingerprints, lengths all wrong", func() []File {
			fs := download(13)
			for i := range fs {
				fs[i].Recordings, fs[i].LengthMs = nil, 600000
			}
			return fs
		}, false, Refuse, CodeWrongAlbum, "rel-cd"},
		{"tags name the group: strong even unprinted", func() []File {
			fs := download(13)
			for i := range fs {
				fs[i].Recordings, fs[i].Title, fs[i].GroupMBID = nil, "", "rg-ram"
			}
			return fs
		}, false, Accept, CodeMatched, "rel-cd"},
	}
	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			v := Verify(ram, eds, c.files(), c.printed, false)
			if v.Outcome != c.out || v.Code != c.code {
				t.Fatalf("got %s/%s (%s), want %s/%s", v.Outcome, v.Code, v.Reason, c.out, c.code)
			}
			got := ""
			if v.Edition >= 0 {
				got = eds[v.Edition].MBID
			}
			if got != c.edition {
				t.Errorf("edition %q, want %q", got, c.edition)
			}
			if v.Reason == "" {
				t.Error("no reason given")
			}
		})
	}
}

func TestVerify_UnnumberedFilesPairByPath(t *testing.T) {
	fs := download(13)
	for i := range fs {
		fs[i].Track, fs[i].Disc = 0, 0
	}
	fs[0], fs[5] = fs[5], fs[0] // listed out of order; their names sort right
	v := Verify(ram, []Edition{edition("rel-cd", 13)}, fs, true, false)
	if v.Outcome != Accept || v.Evidence.Recordings != 13 {
		t.Fatalf("got %+v", v)
	}
}

func TestVerify_ImportAnywayTakesTheBestEdition(t *testing.T) {
	v := Verify(ram, []Edition{edition("rel-cd", 13)}, download(14), true, true)
	if v.Outcome != Accept || v.Code != CodeForced || v.Edition != 0 || len(v.Pairs) != 13 {
		t.Fatalf("got %+v", v)
	}
	if v := Verify(ram, nil, nil, true, true); v.Outcome != Refuse {
		t.Errorf("forced with no audio: %+v", v)
	}
}

func TestVerify_WithoutAcoustIDTheReasonSaysSo(t *testing.T) {
	fs := download(13)
	for i := range fs {
		fs[i].Recordings = nil
	}
	v := Verify(ram, []Edition{edition("rel-cd", 13)}, fs, false, false)
	if !strings.Contains(v.Reason, "AcoustID was not asked") {
		t.Errorf("reason %q", v.Reason)
	}
}

func TestPlan_LibraryNaming(t *testing.T) {
	e := edition("rel-cd", 2)
	e.Tracks[1].Title = "Within: Part 2/3?"
	pl := Plan("/music", ram, &e, download(2), Verify(ram, []Edition{e}, download(2), true, false).Pairs)
	want := []string{
		"/music/Daft Punk/Random Access Memories (2013)/Daft Punk - Random Access Memories - 01 - Give Life Back to Music.flac",
		"/music/Daft Punk/Random Access Memories (2013)/Daft Punk - Random Access Memories - 02 - Within - Part 2+3!.flac",
	}
	for i, p := range pl {
		if p.Dest != want[i] {
			t.Errorf("dest %d = %q, want %q", i, p.Dest, want[i])
		}
	}
	if pl[0].Recording != "rec-01" || pl[0].Tracks != 2 {
		t.Errorf("placement %+v", pl[0])
	}
}

func TestPlan_MultiDiscGetsAMediumFolder(t *testing.T) {
	e := edition("rel-2cd", 4)
	e.Tracks[2].Medium, e.Tracks[2].Position = 2, 1
	e.Tracks[3].Medium, e.Tracks[3].Position = 2, 2
	fs := download(4)
	fs[2].Disc, fs[2].Track, fs[3].Disc, fs[3].Track = 2, 1, 2, 2
	pl := Plan("/music", ram, &e, fs, Verify(ram, []Edition{e}, fs, true, false).Pairs)
	if got := filepath.Dir(pl[3].Dest); got != "/music/Daft Punk/Random Access Memories (2013)/CD 02" {
		t.Errorf("disc folder %q", got)
	}
	if !strings.HasSuffix(pl[3].Dest, " - 02 - Get Lucky.flac") && !strings.Contains(pl[3].Dest, " - 02 - ") {
		t.Errorf("dest %q", pl[3].Dest)
	}
}

func TestSegment(t *testing.T) {
	for in, want := range map[string]string{
		"AC/DC": "AC+DC", `What?`: "What!", "Title: Sub": "Title - Sub", "a:b": "a-b", " ..x.. ": "x",
		"": "_", "..": "_", `"Quoted" <x> *y* |z|`: "Quoted x -y- z",
	} {
		if got := Segment(in); got != want {
			t.Errorf("Segment(%q) = %q, want %q", in, got, want)
		}
	}
	if long := Segment(strings.Repeat("é", 200)); len(long) > segmentMax {
		t.Errorf("long segment is %d bytes", len(long))
	}
}

func TestTagsArgs(t *testing.T) {
	tg := Tags{Title: "Get Lucky", Artist: "Daft Punk", Track: 8, Tracks: 13, Disc: 1, Discs: 1, Year: 2013,
		RecordingMBID: "rec-08", GroupMBID: "rg-ram"}
	flac := strings.Join(tg.args(".flac"), " ")
	for _, s := range []string{"title=Get Lucky", "track=8/13", "date=2013", "MUSICBRAINZ_TRACKID=rec-08", "MUSICBRAINZ_RELEASEGROUPID=rg-ram"} {
		if !strings.Contains(flac, s) {
			t.Errorf("flac args lack %q: %s", s, flac)
		}
	}
	if strings.Contains(flac, "MUSICBRAINZ_ALBUMID") {
		t.Errorf("an empty release id was written: %s", flac)
	}
	if mp3 := strings.Join(tg.args(".mp3"), " "); !strings.Contains(mp3, "MusicBrainz Track Id=rec-08") {
		t.Errorf("mp3 args %s", mp3)
	}
	if m4a := strings.Join(tg.args(".m4a"), " "); strings.Contains(m4a, "MusicBrainz") {
		t.Errorf("m4a args %s", m4a)
	}
}