CREATE TABLE IF NOT EXISTS template_asset (
  id BIGSERIAL PRIMARY KEY,
  title VARCHAR(255) NOT NULL,
  description TEXT,
  file_name VARCHAR(255) NOT NULL,
  storage_path TEXT NOT NULL,
  storage_provider VARCHAR(30) NOT NULL DEFAULT 'local',
  mime_type VARCHAR(120) NOT NULL,
  size_bytes BIGINT NOT NULL DEFAULT 0,
  sha256_hash VARCHAR(64) NOT NULL,
  uploaded_by BIGINT REFERENCES app_user(id),
  is_active BOOLEAN NOT NULL DEFAULT TRUE,
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

ALTER TABLE template_item
  ADD COLUMN IF NOT EXISTS content_format VARCHAR(20) NOT NULL DEFAULT 'markdown';

ALTER TABLE template_item
  ADD COLUMN IF NOT EXISTS logo_asset_id BIGINT;

DO $$
BEGIN
  IF NOT EXISTS (
    SELECT 1
      FROM pg_constraint
     WHERE conname = 'template_item_logo_asset_id_fkey'
  ) THEN
    ALTER TABLE template_item
      ADD CONSTRAINT template_item_logo_asset_id_fkey
      FOREIGN KEY (logo_asset_id) REFERENCES template_asset(id) ON DELETE SET NULL;
  END IF;
END$$;

DO $$
BEGIN
  IF NOT EXISTS (
    SELECT 1
      FROM pg_constraint
     WHERE conname = 'template_item_content_format_check'
  ) THEN
    ALTER TABLE template_item
      ADD CONSTRAINT template_item_content_format_check
      CHECK (content_format IN ('markdown', 'html'));
  END IF;
END$$;

CREATE INDEX IF NOT EXISTS idx_template_item_logo_asset_id ON template_item(logo_asset_id);
CREATE INDEX IF NOT EXISTS idx_template_asset_active ON template_asset(is_active, created_at DESC);

DO $$
BEGIN
  IF NOT EXISTS (
    SELECT 1 FROM pg_trigger WHERE tgname = 'trg_template_asset_updated_at'
  ) THEN
    CREATE TRIGGER trg_template_asset_updated_at
      BEFORE UPDATE ON template_asset
      FOR EACH ROW EXECUTE FUNCTION set_updated_at();
  END IF;
END$$;

ALTER TABLE template_asset ENABLE ROW LEVEL SECURITY;
ALTER TABLE template_asset FORCE ROW LEVEL SECURITY;

DROP POLICY IF EXISTS template_asset_select_policy ON template_asset;
DROP POLICY IF EXISTS template_asset_modify_policy ON template_asset;
CREATE POLICY template_asset_select_policy ON template_asset
  FOR SELECT USING (app_can_view_page('templates'));
CREATE POLICY template_asset_modify_policy ON template_asset
  FOR ALL USING (app_has_permission('templates.write'))
  WITH CHECK (app_has_permission('templates.write'));

UPDATE template_item
   SET content = '{{template_logo}}

' || content,
       updated_at = NOW()
 WHERE category = 'meeting_protocol'
   AND content NOT LIKE '%{{template_logo}}%';