CREATE TABLE subtitle_sources (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  name text NOT NULL CHECK (char_length(btrim(name)) BETWEEN 1 AND 128),
  source_type text NOT NULL DEFAULT 'json_rest_v1' CHECK (source_type IN ('json_rest_v1')),
  base_url text NOT NULL CHECK (base_url ~ '^https://'),
  api_key_cipher bytea,
  enabled boolean NOT NULL DEFAULT true,
  languages text[] NOT NULL DEFAULT '{}',
  priority integer NOT NULL DEFAULT 100 CHECK (priority BETWEEN 1 AND 10000),
  timeout_seconds integer NOT NULL DEFAULT 10 CHECK (timeout_seconds BETWEEN 2 AND 30),
  created_by uuid NOT NULL REFERENCES users(id),
  updated_by uuid NOT NULL REFERENCES users(id),
  created_at timestamptz NOT NULL DEFAULT now(),
  updated_at timestamptz NOT NULL DEFAULT now(),
  UNIQUE (name)
);

CREATE INDEX subtitle_sources_enabled_idx
  ON subtitle_sources(priority,id) WHERE enabled;

CREATE TABLE subtitle_search_candidates (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  source_id uuid NOT NULL REFERENCES subtitle_sources(id) ON DELETE CASCADE,
  media_item_id uuid NOT NULL,
  media_source_id uuid NOT NULL,
  external_id text NOT NULL CHECK (char_length(external_id) BETWEEN 1 AND 512),
  title text NOT NULL CHECK (char_length(title) BETWEEN 1 AND 512),
  language text NOT NULL DEFAULT '' CHECK (char_length(language) <= 64),
  codec text NOT NULL CHECK (codec IN ('srt','ass','ssa','vtt','sup','sub','idx')),
  release_group text NOT NULL DEFAULT '' CHECK (char_length(release_group) <= 256),
  score double precision NOT NULL DEFAULT 0 CHECK (score >= 0 AND score <= 1),
  download_path text NOT NULL CHECK (char_length(download_path) BETWEEN 1 AND 2048),
  hearing_impaired boolean NOT NULL DEFAULT false,
  created_by uuid NOT NULL REFERENCES users(id),
  created_at timestamptz NOT NULL DEFAULT now(),
  expires_at timestamptz NOT NULL DEFAULT (now() + interval '1 hour')
);

CREATE INDEX subtitle_search_candidates_actor_idx
  ON subtitle_search_candidates(created_by,created_at DESC);
CREATE INDEX subtitle_search_candidates_expiry_idx
  ON subtitle_search_candidates(expires_at);

CREATE TABLE subtitle_imports (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  candidate_id uuid NOT NULL REFERENCES subtitle_search_candidates(id) ON DELETE CASCADE,
  actor_user_id uuid NOT NULL REFERENCES users(id),
  idempotency_key text NOT NULL CHECK (char_length(idempotency_key) BETWEEN 16 AND 128),
  state text NOT NULL DEFAULT 'processing' CHECK (state IN ('processing','succeeded','failed')),
  result jsonb NOT NULL DEFAULT '{}'::jsonb CHECK (jsonb_typeof(result)='object'),
  error_code text NOT NULL DEFAULT '',
  created_at timestamptz NOT NULL DEFAULT now(),
  updated_at timestamptz NOT NULL DEFAULT now(),
  UNIQUE(actor_user_id,idempotency_key)
);