// Resources a user generated for themselves.
//
// Learning content is moderator-owned and published into categories for
// everyone. This is the other thing people wanted: somewhere to generate a deck
// for tomorrow's teaching session without it becoming institutional content,
// and without needing to be a moderator to do it at all.
//
// Private by construction. Every query filters on user_id, and the foreign key
// cascades, so deleting an account takes its drafts with it. There is no
// category, no publish state and no sharing: this table is one person's
// workspace, and adding sharing later should be a deliberate decision rather
// than something that leaks out of a missing WHERE clause.

exports.up = pgm => {
  pgm.sql(`
    CREATE TABLE IF NOT EXISTS user_resources (
      id SERIAL PRIMARY KEY,
      user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
      title TEXT NOT NULL DEFAULT 'Untitled',
      -- presentation | article. Decides which prompt writes it and which
      -- formats it exports to.
      kind TEXT NOT NULL DEFAULT 'presentation',
      -- Markdown is the artifact. Every export is rendered from it on demand,
      -- so refining means editing text rather than patching a binary.
      markdown TEXT NOT NULL DEFAULT '',
      topic TEXT NOT NULL DEFAULT '',
      -- How many corpus excerpts it was written from; 0 means the model alone.
      grounded_count INTEGER NOT NULL DEFAULT 0,
      created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
      updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
    );
    CREATE INDEX IF NOT EXISTS idx_user_resources_owner
      ON user_resources(user_id, created_at DESC);
  `);
};

exports.down = pgm => {
  pgm.sql('DROP TABLE IF EXISTS user_resources;');
};