-- Add slug (public unique ID) to tracks
ALTER TABLE tracks ADD COLUMN slug TEXT;

-- Generate slugs for existing tracks
UPDATE tracks SET slug = encode(gen_random_uuid()::text::bytea, 'hex') WHERE slug IS NULL;

ALTER TABLE tracks ALTER COLUMN slug SET NOT NULL;
CREATE UNIQUE INDEX idx_tracks_slug ON tracks (slug);

-- Add slug to albums
ALTER TABLE albums ADD COLUMN slug TEXT;
UPDATE albums SET slug = encode(gen_random_uuid()::text::bytea, 'hex') WHERE slug IS NULL;
ALTER TABLE albums ALTER COLUMN slug SET NOT NULL;
CREATE UNIQUE INDEX idx_albums_slug ON albums (slug);

-- Add slug to artists
ALTER TABLE artists ADD COLUMN slug TEXT;
UPDATE artists SET slug = encode(gen_random_uuid()::text::bytea, 'hex') WHERE slug IS NULL;
ALTER TABLE artists ALTER COLUMN slug SET NOT NULL;
CREATE UNIQUE INDEX idx_artists_slug ON artists (slug);

-- Album artwork table
CREATE TABLE album_images (
    id          BIGSERIAL PRIMARY KEY,
    album_id    BIGINT NOT NULL REFERENCES albums(id) ON DELETE CASCADE,
    image_type  TEXT NOT NULL DEFAULT 'cover',  -- 'cover', 'back', 'booklet', 'other'
    file_path   TEXT NOT NULL,                  -- relative path in storage
    file_hash   TEXT NOT NULL,
    mime_type   TEXT NOT NULL,
    width       INT,
    height      INT,
    file_size   BIGINT NOT NULL,
    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX idx_album_images_album ON album_images (album_id);
CREATE UNIQUE INDEX idx_album_images_hash ON album_images (file_hash);