CREATE EXTENSION IF NOT EXISTS pg_trgm;

CREATE TABLE artists (
    id   BIGSERIAL PRIMARY KEY,
    name TEXT NOT NULL UNIQUE,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE albums (
    id        BIGSERIAL PRIMARY KEY,
    artist_id BIGINT NOT NULL REFERENCES artists(id) ON DELETE CASCADE,
    name      TEXT NOT NULL,
    year      INT,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    UNIQUE (artist_id, name)
);

CREATE TABLE tracks (
    id              BIGSERIAL PRIMARY KEY,
    artist_id       BIGINT NOT NULL REFERENCES artists(id) ON DELETE CASCADE,
    album_id        BIGINT REFERENCES albums(id) ON DELETE SET NULL,
    title           TEXT NOT NULL,
    track_number    INT,
    genre           TEXT,
    duration_secs   DOUBLE PRECISION,
    codec           TEXT,
    bitrate         INT,
    sample_rate     INT,
    file_hash       TEXT NOT NULL UNIQUE,
    file_size       BIGINT NOT NULL,
    storage_path    TEXT NOT NULL,
    manual_override BOOLEAN NOT NULL DEFAULT FALSE,
    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at      TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE pending_tracks (
    id               UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    status           TEXT NOT NULL DEFAULT 'pending',
    inbox_path       TEXT NOT NULL,
    file_hash        TEXT NOT NULL,
    file_size        BIGINT NOT NULL,
    raw_title        TEXT,
    raw_artist       TEXT,
    raw_album        TEXT,
    raw_year         INT,
    raw_track_number INT,
    raw_genre        TEXT,
    duration_secs    DOUBLE PRECISION,
    path_title       TEXT,
    path_artist      TEXT,
    path_album       TEXT,
    path_year        INT,
    path_track_number INT,
    norm_title       TEXT,
    norm_artist      TEXT,
    norm_album       TEXT,
    norm_year        INT,
    norm_track_number INT,
    norm_genre       TEXT,
    norm_featured_artists TEXT,
    confidence       DOUBLE PRECISION,
    llm_notes        TEXT,
    error_message    TEXT,
    created_at       TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at       TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE track_artists (
    id        BIGSERIAL PRIMARY KEY,
    track_id  BIGINT NOT NULL REFERENCES tracks(id) ON DELETE CASCADE,
    artist_id BIGINT NOT NULL REFERENCES artists(id) ON DELETE CASCADE,
    role      TEXT NOT NULL DEFAULT 'featured',
    UNIQUE (track_id, artist_id, role)
);

-- Indexes
CREATE INDEX idx_artists_name_trgm    ON artists USING gin (name gin_trgm_ops);
CREATE INDEX idx_albums_name_trgm     ON albums  USING gin (name gin_trgm_ops);
CREATE INDEX idx_tracks_file_hash     ON tracks (file_hash);
CREATE INDEX idx_pending_status       ON pending_tracks (status);
CREATE INDEX idx_pending_file_hash    ON pending_tracks (file_hash);
CREATE INDEX idx_track_artists_track  ON track_artists (track_id);
CREATE INDEX idx_track_artists_artist ON track_artists (artist_id);