// Package db provides database helpers and models
//nolint:lll // struct tags get very long and can't be split
package db

// see this db fiddle to mess around with the schema
// https://www.db-fiddle.com/f/wJ7z8L7mu6ZKaYmWk1xr1p/5

import (
	"path"
	"path/filepath"
	"strconv"
	"strings"
	"time"

	// TODO: remove this dep

	"go.senan.xyz/gonic/server/ctrlsubsonic/specid"
	"go.senan.xyz/gonic/server/mime"
)

func splitInt(in, sep string) []int {
	if in == "" {
		return []int{}
	}
	parts := strings.Split(in, sep)
	ret := make([]int, 0, len(parts))
	for _, p := range parts {
		i, _ := strconv.Atoi(p)
		ret = append(ret, i)
	}
	return ret
}

func joinInt(in []int, sep string) string {
	if in == nil {
		return ""
	}
	strs := make([]string, 0, len(in))
	for _, i := range in {
		strs = append(strs, strconv.Itoa(i))
	}
	return strings.Join(strs, sep)
}

type Artist struct {
	ID         int      `gorm:"primary_key"`
	Name       string   `gorm:"not null; unique_index"`
	NameUDec   string   `sql:"default: null"`
	Albums     []*Album `gorm:"foreignkey:TagArtistID"`
	AlbumCount int      `sql:"-"`
}

func (a *Artist) SID() *specid.ID {
	return &specid.ID{Type: specid.Artist, Value: a.ID}
}

func (a *Artist) IndexName() string {
	if len(a.NameUDec) > 0 {
		return a.NameUDec
	}
	return a.Name
}

type Genre struct {
	ID         int    `gorm:"primary_key"`
	Name       string `gorm:"not null; unique_index"`
	AlbumCount int    `sql:"-"`
	TrackCount int    `sql:"-"`
}

// AudioFile is used to avoid some duplication in handlers_raw.go
// between Track and Podcast
type AudioFile interface {
	AudioFilename() string
	Ext() string
	MIME() string
	AudioBitrate() int
}

type Track struct {
	ID             int `gorm:"primary_key"`
	CreatedAt      time.Time
	UpdatedAt      time.Time
	Filename       string `gorm:"not null; unique_index:idx_folder_filename" sql:"default: null"`
	FilenameUDec   string `sql:"default: null"`
	Album          *Album
	AlbumID        int `gorm:"not null; unique_index:idx_folder_filename" sql:"default: null; type:int REFERENCES albums(id) ON DELETE CASCADE"`
	Artist         *Artist
	ArtistID       int      `gorm:"not null" sql:"default: null; type:int REFERENCES artists(id) ON DELETE CASCADE"`
	Genres         []*Genre `gorm:"many2many:track_genres"`
	Size           int      `gorm:"not null" sql:"default: null"`
	Length         int      `sql:"default: null"`
	Bitrate        int      `sql:"default: null"`
	TagTitle       string   `sql:"default: null"`
	TagTitleUDec   string   `sql:"default: null"`
	TagTrackArtist string   `sql:"default: null"`
	TagTrackNumber int      `sql:"default: null"`
	TagDiscNumber  int      `sql:"default: null"`
	TagBrainzID    string   `sql:"default: null"`
}

func (t *Track) SID() *specid.ID {
	return &specid.ID{Type: specid.Track, Value: t.ID}
}

func (t *Track) AlbumSID() *specid.ID {
	return &specid.ID{Type: specid.Album, Value: t.AlbumID}
}

func (t *Track) ArtistSID() *specid.ID {
	return &specid.ID{Type: specid.Artist, Value: t.ArtistID}
}

func (t *Track) Ext() string {
	longExt := path.Ext(t.Filename)
	if len(longExt) < 1 {
		return ""
	}
	return longExt[1:]
}

func (t *Track) AudioFilename() string {
	return t.Filename
}

func (t *Track) AudioBitrate() int {
	return t.Bitrate
}

func (t *Track) MIME() string {
	v, _ := mime.FromExtension(t.Ext())
	return v
}

func (t *Track) RelPath() string {
	if t.Album == nil {
		return ""
	}
	return path.Join(
		t.Album.LeftPath,
		t.Album.RightPath,
		t.Filename,
	)
}

func (t *Track) GenreStrings() []string {
	strs := make([]string, 0, len(t.Genres))
	for _, genre := range t.Genres {
		strs = append(strs, genre.Name)
	}
	return strs
}

type User struct {
	ID                int `gorm:"primary_key"`
	CreatedAt         time.Time
	Name              string `gorm:"not null; unique_index" sql:"default: null"`
	Password          string `gorm:"not null" sql:"default: null"`
	LastFMSession     string `sql:"default: null"`
	ListenBrainzURL   string `sql:"default: null"`
	ListenBrainzToken string `sql:"default: null"`
	IsAdmin           bool   `sql:"default: null"`
}

type Setting struct {
	Key   string `gorm:"not null; primary_key; auto_increment:false" sql:"default: null"`
	Value string `sql:"default: null"`
}

type Play struct {
	ID      int `gorm:"primary_key"`
	User    *User
	UserID  int `gorm:"not null; index" sql:"default: null; type:int REFERENCES users(id) ON DELETE CASCADE"`
	Album   *Album
	AlbumID int       `gorm:"not null; index" sql:"default: null; type:int REFERENCES albums(id) ON DELETE CASCADE"`
	Time    time.Time `sql:"default: null"`
	Count   int
}

type Album struct {
	ID            int `gorm:"primary_key"`
	UpdatedAt     time.Time
	ModifiedAt    time.Time
	LeftPath      string `gorm:"unique_index:idx_left_path_right_path"`
	RightPath     string `gorm:"not null; unique_index:idx_left_path_right_path" sql:"default: null"`
	RightPathUDec string `sql:"default: null"`
	Parent        *Album
	ParentID      int      `sql:"default: null; type:int REFERENCES albums(id) ON DELETE CASCADE"`
	Genres        []*Genre `gorm:"many2many:album_genres"`
	Cover         string   `sql:"default: null"`
	TagArtist     *Artist
	TagArtistID   int    `gorm:"index" sql:"default: null; type:int REFERENCES artists(id) ON DELETE CASCADE"`
	TagTitle      string `sql:"default: null"`
	TagTitleUDec  string `sql:"default: null"`
	TagBrainzID   string `sql:"default: null"`
	TagYear       int    `sql:"default: null"`
	Tracks        []*Track
	ChildCount    int `sql:"-"`
	Duration      int `sql:"-"`
}

func (a *Album) SID() *specid.ID {
	return &specid.ID{Type: specid.Album, Value: a.ID}
}

func (a *Album) ParentSID() *specid.ID {
	return &specid.ID{Type: specid.Album, Value: a.ParentID}
}

func (a *Album) IndexRightPath() string {
	if len(a.RightPathUDec) > 0 {
		return a.RightPathUDec
	}
	return a.RightPath
}

func (a *Album) GenreStrings() []string {
	strs := make([]string, 0, len(a.Genres))
	for _, genre := range a.Genres {
		strs = append(strs, genre.Name)
	}
	return strs
}

type Playlist struct {
	ID         int `gorm:"primary_key"`
	CreatedAt  time.Time
	UpdatedAt  time.Time
	User       *User
	UserID     int `sql:"default: null; type:int REFERENCES users(id) ON DELETE CASCADE"`
	Name       string
	Comment    string
	TrackCount int
	Items      string
}

func (p *Playlist) GetItems() []int {
	return splitInt(p.Items, ",")
}

func (p *Playlist) SetItems(items []int) {
	p.Items = joinInt(items, ",")
	p.TrackCount = len(items)
}

type PlayQueue struct {
	ID        int `gorm:"primary_key"`
	CreatedAt time.Time
	UpdatedAt time.Time
	User      *User
	UserID    int `sql:"default: null; type:int REFERENCES users(id) ON DELETE CASCADE"`
	Current   int
	Position  int
	ChangedBy string
	Items     string
}

func (p *PlayQueue) CurrentSID() *specid.ID {
	return &specid.ID{Type: specid.Track, Value: p.Current}
}

func (p *PlayQueue) GetItems() []int {
	return splitInt(p.Items, ",")
}

func (p *PlayQueue) SetItems(items []int) {
	p.Items = joinInt(items, ",")
}

type TranscodePreference struct {
	User    *User
	UserID  int    `gorm:"not null; unique_index:idx_user_id_client" sql:"default: null; type:int REFERENCES users(id) ON DELETE CASCADE"`
	Client  string `gorm:"not null; unique_index:idx_user_id_client" sql:"default: null"`
	Profile string `gorm:"not null" sql:"default: null"`
}

type TrackGenre struct {
	Track   *Track
	TrackID int `gorm:"not null; unique_index:idx_track_id_genre_id" sql:"default: null; type:int REFERENCES tracks(id) ON DELETE CASCADE"`
	Genre   *Genre
	GenreID int `gorm:"not null; unique_index:idx_track_id_genre_id" sql:"default: null; type:int REFERENCES genres(id) ON DELETE CASCADE"`
}

type AlbumGenre struct {
	Album   *Album
	AlbumID int `gorm:"not null; unique_index:idx_album_id_genre_id" sql:"default: null; type:int REFERENCES albums(id) ON DELETE CASCADE"`
	Genre   *Genre
	GenreID int `gorm:"not null; unique_index:idx_album_id_genre_id" sql:"default: null; type:int REFERENCES genres(id) ON DELETE CASCADE"`
}

type PodcastAutoDownload string

const (
	PodcastAutoDownloadLatest PodcastAutoDownload = "latest"
	PodcastAutoDownloadNone   PodcastAutoDownload = "none"
)

type Podcast struct {
	ID           int `gorm:"primary_key"`
	UpdatedAt    time.Time
	ModifiedAt   time.Time
	UserID       int `sql:"default: null; type:int REFERENCES users(id) ON DELETE CASCADE"`
	URL          string
	Title        string
	Description  string
	ImageURL     string
	ImagePath    string
	Error        string
	Episodes     []*PodcastEpisode
	AutoDownload PodcastAutoDownload
}

func (p *Podcast) Fullpath(podcastPath string) string {
	sanitizedTitle := strings.ReplaceAll(p.Title, "/", "_")
	return filepath.Join(podcastPath, filepath.Clean(sanitizedTitle))
}

func (p *Podcast) SID() *specid.ID {
	return &specid.ID{Type: specid.Podcast, Value: p.ID}
}

type PodcastEpisodeStatus string

const (
	PodcastEpisodeStatusDownloading PodcastEpisodeStatus = "downloading"
	PodcastEpisodeStatusSkipped     PodcastEpisodeStatus = "skipped"
	PodcastEpisodeStatusDeleted     PodcastEpisodeStatus = "deleted"
	PodcastEpisodeStatusCompleted   PodcastEpisodeStatus = "completed"
	PodcastEpisodeStatusError       PodcastEpisodeStatus = "error"
)

type PodcastEpisode struct {
	ID          int `gorm:"primary_key"`
	CreatedAt   time.Time
	UpdatedAt   time.Time
	ModifiedAt  time.Time
	PodcastID   int `gorm:"not null" sql:"default: null; type:int REFERENCES podcasts(id) ON DELETE CASCADE"`
	Title       string
	Description string
	PublishDate *time.Time
	AudioURL    string
	Bitrate     int
	Length      int
	Size        int
	Path        string
	Filename    string
	Status      PodcastEpisodeStatus
	Error       string
}

func (pe *PodcastEpisode) SID() *specid.ID {
	return &specid.ID{Type: specid.PodcastEpisode, Value: pe.ID}
}

func (pe *PodcastEpisode) AudioFilename() string {
	return pe.Filename
}

func (pe *PodcastEpisode) Ext() string {
	longExt := path.Ext(pe.Filename)
	if len(longExt) < 1 {
		return ""
	}
	return longExt[1:]
}

func (pe *PodcastEpisode) MIME() string {
	v, _ := mime.FromExtension(pe.Ext())
	return v
}

func (pe *PodcastEpisode) AudioBitrate() int {
	return pe.Bitrate
}

type Bookmark struct {
	ID          int `gorm:"primary_key"`
	User        *User
	UserID      int `sql:"default: null; type:int REFERENCES users(id) ON DELETE CASCADE"`
	Position    int
	Comment     string
	EntryIDType string
	EntryID     int
	CreatedAt   time.Time
	UpdatedAt   time.Time
}