-- Members area schema.
--
-- Applied at every startup and written to be idempotent, so deploying a new
-- version of the app needs no migration step for as long as the schema only
-- grows. A change that alters an existing column will need a real migration;
-- there is deliberately no framework here to pretend otherwise.

CREATE TABLE IF NOT EXISTS members (
  id            INTEGER PRIMARY KEY,
  -- COLLATE NOCASE because Gitea treats logins case-insensitively; without it
  -- "Pablo" and "pablo" would be two members with one Gitea account.
  gitea_login   TEXT    NOT NULL UNIQUE COLLATE NOCASE,
  display_name  TEXT    NOT NULL DEFAULT '',
  email         TEXT    NOT NULL DEFAULT '',
  role          TEXT    NOT NULL CHECK (role IN ('owner', 'admin', 'user', 'tombstone')),
  active        INTEGER NOT NULL DEFAULT 1 CHECK (active IN (0, 1)),
  created_at    TEXT    NOT NULL DEFAULT (datetime('now')),
  created_by    INTEGER REFERENCES members(id),
  last_seen_at  TEXT
);

-- The one-owner rule, held by the database rather than by the application, so
-- a mistake in a handler cannot produce a second owner. SQLite enforces a
-- partial unique index exactly like a full one.
CREATE UNIQUE INDEX IF NOT EXISTS members_one_owner
  ON members(role) WHERE role = 'owner';

CREATE TABLE IF NOT EXISTS threads (
  id          INTEGER PRIMARY KEY,
  author_id   INTEGER NOT NULL REFERENCES members(id),
  title       TEXT    NOT NULL,
  body_md     TEXT    NOT NULL,
  created_at  TEXT    NOT NULL DEFAULT (datetime('now')),
  edited_at   TEXT,
  pinned      INTEGER NOT NULL DEFAULT 0 CHECK (pinned IN (0, 1)),
  locked      INTEGER NOT NULL DEFAULT 0 CHECK (locked IN (0, 1)),
  -- Soft delete: a moderator's mistake stays recoverable, and removing one
  -- comment does not tear a hole in the conversation around it.
  deleted_at  TEXT
);

CREATE INDEX IF NOT EXISTS threads_live
  ON threads(pinned DESC, created_at DESC) WHERE deleted_at IS NULL;

CREATE TABLE IF NOT EXISTS comments (
  id          INTEGER PRIMARY KEY,
  thread_id   INTEGER NOT NULL REFERENCES threads(id),
  author_id   INTEGER NOT NULL REFERENCES members(id),
  body_md     TEXT    NOT NULL,
  created_at  TEXT    NOT NULL DEFAULT (datetime('now')),
  edited_at   TEXT,
  deleted_at  TEXT
);

CREATE INDEX IF NOT EXISTS comments_thread
  ON comments(thread_id, created_at) WHERE deleted_at IS NULL;