-- +goose Up
CREATE TYPE source_type   AS ENUM ('nfs', 'local');
CREATE TYPE source_status AS ENUM ('pending', 'mounted', 'error', 'disabled');
CREATE TYPE tag_priority  AS ENUM ('tags_first', 'path_first');

CREATE TABLE library_sources (
  id              uuid PRIMARY KEY,
  name            text NOT NULL,
  type            source_type NOT NULL,
  nfs_server      text,
  nfs_export      text,
  nfs_options     text NOT NULL DEFAULT 'ro,nfsvers=4.1,soft,timeo=150,retrans=3',
  local_path      text,
  tag_priority    tag_priority NOT NULL DEFAULT 'tags_first',
  accepts_uploads boolean NOT NULL DEFAULT false,
  write_template  text,
  scan_interval   interval,
  status          source_status NOT NULL DEFAULT 'pending',
  status_message  text,
  last_scan_at    timestamptz,
  created_at      timestamptz NOT NULL DEFAULT now()
);

CREATE TABLE path_patterns (
  id         uuid PRIMARY KEY,
  source_id  uuid NOT NULL REFERENCES library_sources(id) ON DELETE CASCADE,
  position   int NOT NULL,
  regex      text NOT NULL,
  is_enabled boolean NOT NULL DEFAULT true,
  UNIQUE (source_id, position)
);

CREATE TABLE artists (
  id         uuid PRIMARY KEY,
  name       text NOT NULL,
  sort_name  text NOT NULL,
  name_norm  text NOT NULL UNIQUE,
  image_path text,
  created_at timestamptz NOT NULL DEFAULT now()
);

CREATE TABLE albums (
  id              uuid PRIMARY KEY,
  title           text NOT NULL,
  title_norm      text NOT NULL,
  album_artist_id uuid NOT NULL REFERENCES artists(id),
  year            int,
  cover_path      text,
  cover_colors    text[],
  created_at      timestamptz NOT NULL DEFAULT now(),
  UNIQUE (album_artist_id, title_norm)
);

CREATE TABLE media_files (
  id             uuid PRIMARY KEY,
  source_id      uuid NOT NULL REFERENCES library_sources(id) ON DELETE CASCADE,
  rel_path       text NOT NULL,
  size_bytes     bigint NOT NULL,
  mtime          timestamptz NOT NULL,
  content_hash   bytea,
  sha256         bytea,
  upload_file_id uuid,
  format         text NOT NULL,
  codec          text,
  bitrate        int,
  sample_rate    int,
  bit_depth      int,
  channels       int,
  duration_ms    int NOT NULL,
  track_id       uuid,
  missing_since  timestamptz,
  scan_error     text,
  UNIQUE (source_id, rel_path)
);
CREATE INDEX media_files_content_hash_idx ON media_files (content_hash);
CREATE INDEX media_files_sha256_idx ON media_files (sha256);
CREATE INDEX media_files_track_idx ON media_files (track_id);

CREATE TABLE tracks (
  id              uuid PRIMARY KEY,
  title           text NOT NULL,
  title_norm      text NOT NULL,
  album_id        uuid NOT NULL REFERENCES albums(id),
  disc_no         int,
  track_no        int,
  year            int,
  duration_ms     int NOT NULL,
  primary_file_id uuid REFERENCES media_files(id) ON DELETE SET NULL,
  explicit        boolean,
  created_at      timestamptz NOT NULL DEFAULT now(),
  updated_at      timestamptz NOT NULL DEFAULT now()
);
CREATE INDEX tracks_album_idx ON tracks (album_id, disc_no, track_no);
-- Дубли: тот же альбом, название и длительность ±2 с ищутся по (album_id, title_norm).
CREATE INDEX tracks_dedup_idx ON tracks (album_id, title_norm);
ALTER TABLE media_files ADD FOREIGN KEY (track_id) REFERENCES tracks(id) ON DELETE SET NULL;

CREATE TABLE track_artists (
  track_id  uuid REFERENCES tracks(id) ON DELETE CASCADE,
  artist_id uuid REFERENCES artists(id) ON DELETE CASCADE,
  role      text NOT NULL DEFAULT 'main',
  position  int NOT NULL,
  PRIMARY KEY (track_id, artist_id, role)
);
CREATE INDEX track_artists_artist_idx ON track_artists (artist_id);

CREATE TABLE genres (
  id        serial PRIMARY KEY,
  name      text NOT NULL,
  name_norm text NOT NULL UNIQUE,
  parent_id int REFERENCES genres(id)
);

CREATE TABLE track_genres (
  track_id uuid REFERENCES tracks(id) ON DELETE CASCADE,
  genre_id int REFERENCES genres(id),
  source   text NOT NULL,
  weight   real NOT NULL DEFAULT 1,
  PRIMARY KEY (track_id, genre_id, source)
);

-- +goose Down
DROP TABLE track_genres;
DROP TABLE genres;
DROP TABLE track_artists;
ALTER TABLE media_files DROP CONSTRAINT media_files_track_id_fkey;
DROP TABLE tracks;
DROP TABLE media_files;
DROP TABLE albums;
DROP TABLE artists;
DROP TABLE path_patterns;
DROP TABLE library_sources;
DROP TYPE tag_priority;
DROP TYPE source_status;
DROP TYPE source_type;