-- M5a: Lidarr integration foundation. Two tables:
--
-- lidarr_config — singleton (CHECK id=1) holding the operator's Lidarr
-- connection. enabled=false is the unconfigured state.
--
-- lidarr_requests — per-request lifecycle row created by users at
-- /discover, transitioned by admin at /admin/requests, and matched
-- back to library tracks by the reconciler worker. Three matched_*_id
-- FKs (one per kind) instead of polymorphic — clean SQL, ON DELETE
-- SET NULL preserves audit even if the matched track is later removed.

CREATE TABLE lidarr_config (
    id                          smallint PRIMARY KEY DEFAULT 1 CHECK (id = 1),
    enabled                     boolean  NOT NULL DEFAULT false,
    base_url                    text,
    api_key                     text,
    default_quality_profile_id  int,
    default_root_folder_path    text,
    created_at                  timestamptz NOT NULL DEFAULT now(),
    updated_at                  timestamptz NOT NULL DEFAULT now()
);

INSERT INTO lidarr_config (id, enabled) VALUES (1, false);

CREATE TYPE lidarr_request_status AS ENUM (
    'pending', 'approved', 'rejected', 'completed', 'failed'
);
CREATE TYPE lidarr_request_kind AS ENUM ('artist', 'album', 'track');

CREATE TABLE lidarr_requests (
    id                         uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id                    uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    status                     lidarr_request_status NOT NULL DEFAULT 'pending',
    kind                       lidarr_request_kind   NOT NULL,

    lidarr_artist_mbid         text NOT NULL,
    lidarr_album_mbid          text,
    lidarr_track_mbid          text,
    artist_name                text NOT NULL,
    album_title                text,
    track_title                text,

    quality_profile_id         int,
    root_folder_path           text,

    decided_at                 timestamptz,
    decided_by                 uuid REFERENCES users(id) ON DELETE SET NULL,
    notes                      text,

    completed_at               timestamptz,
    matched_track_id           uuid REFERENCES tracks(id) ON DELETE SET NULL,
    matched_album_id           uuid REFERENCES albums(id) ON DELETE SET NULL,
    matched_artist_id          uuid REFERENCES artists(id) ON DELETE SET NULL,

    requested_at               timestamptz NOT NULL DEFAULT now(),
    updated_at                 timestamptz NOT NULL DEFAULT now()
);

CREATE INDEX lidarr_requests_user_id_idx     ON lidarr_requests (user_id);
CREATE INDEX lidarr_requests_status_idx      ON lidarr_requests (status);
CREATE INDEX lidarr_requests_artist_mbid_idx ON lidarr_requests (lidarr_artist_mbid);
CREATE INDEX lidarr_requests_album_mbid_idx  ON lidarr_requests (lidarr_album_mbid)
  WHERE lidarr_album_mbid IS NOT NULL;