-- openStack schema (PostgreSQL 14+)
-- Apply with: psql $DATABASE_URL < schema.sql
-- Idempotent: safe to re-run (CREATE TABLE IF NOT EXISTS + DO blocks).

CREATE EXTENSION IF NOT EXISTS "pgcrypto";

-- Users
CREATE TABLE IF NOT EXISTS users (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  email TEXT NOT NULL UNIQUE CHECK (email ~* '^[^@\s]+@[^@\s]+\.[^@\s]+$'),
  name TEXT NOT NULL CHECK (char_length(name) BETWEEN 1 AND 100),
  password_hash TEXT NOT NULL,
  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

-- Workspaces
CREATE TABLE IF NOT EXISTS workspaces (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  name TEXT NOT NULL CHECK (char_length(name) BETWEEN 1 AND 120),
  owner_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

-- Membership (role-based collaboration)
CREATE TABLE IF NOT EXISTS workspace_members (
  workspace_id UUID NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE,
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  role TEXT NOT NULL DEFAULT 'member' CHECK (role IN ('owner','admin','member','viewer')),
  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  PRIMARY KEY (workspace_id, user_id)
);
CREATE INDEX IF NOT EXISTS idx_workspace_members_user ON workspace_members(user_id);

-- Pages (nested via parent_id)
CREATE TABLE IF NOT EXISTS pages (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  workspace_id UUID NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE,
  parent_id UUID REFERENCES pages(id) ON DELETE CASCADE,
  title TEXT NOT NULL DEFAULT 'Untitled' CHECK (char_length(title) BETWEEN 1 AND 300),
  icon TEXT NOT NULL DEFAULT '',
  cover TEXT NOT NULL DEFAULT '',
  content_json JSONB NOT NULL DEFAULT '{}'::jsonb,
  content_html TEXT NOT NULL DEFAULT '',
  position DOUBLE PRECISION NOT NULL DEFAULT 0,
  is_archived BOOLEAN NOT NULL DEFAULT FALSE,
  created_by UUID REFERENCES users(id) ON DELETE SET NULL,
  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  CHECK (parent_id IS NULL OR parent_id <> id)
);
CREATE INDEX IF NOT EXISTS idx_pages_workspace ON pages(workspace_id);
CREATE INDEX IF NOT EXISTS idx_pages_parent ON pages(parent_id);
CREATE INDEX IF NOT EXISTS idx_pages_title_trgm ON pages USING gin (title gin_trgm_ops);
-- pg_trgm is optional; ignore failure on minimal installs:
-- CREATE EXTENSION IF NOT EXISTS pg_trgm;

-- Comments
CREATE TABLE IF NOT EXISTS comments (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  page_id UUID NOT NULL REFERENCES pages(id) ON DELETE CASCADE,
  author_id UUID REFERENCES users(id) ON DELETE SET NULL,
  body TEXT NOT NULL CHECK (char_length(body) BETWEEN 1 AND 5000),
  created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);
CREATE INDEX IF NOT EXISTS idx_comments_page ON comments(page_id);

-- App settings (first-run installer state, feature flags)
CREATE TABLE IF NOT EXISTS app_settings (
  key TEXT PRIMARY KEY,
  value TEXT NOT NULL,
  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

-- Global admin flag (first user created via web installer)
ALTER TABLE users ADD COLUMN IF NOT EXISTS is_admin BOOLEAN NOT NULL DEFAULT FALSE;

-- Profile / appearance / locale settings (edited via settings window)
ALTER TABLE users ADD COLUMN IF NOT EXISTS avatar TEXT NOT NULL DEFAULT '';
ALTER TABLE users ADD COLUMN IF NOT EXISTS locale TEXT NOT NULL DEFAULT 'en';
ALTER TABLE users ADD COLUMN IF NOT EXISTS theme TEXT NOT NULL DEFAULT 'system';
ALTER TABLE users ADD COLUMN IF NOT EXISTS bg_image TEXT NOT NULL DEFAULT '';
ALTER TABLE users ADD COLUMN IF NOT EXISTS bg_blur BOOLEAN NOT NULL DEFAULT TRUE;

-- Books: independent containers that hold pages (collapsible in sidebar)
CREATE TABLE IF NOT EXISTS books (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  workspace_id UUID NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE,
  title TEXT NOT NULL DEFAULT 'Untitled book' CHECK (char_length(title) BETWEEN 1 AND 200),
  icon TEXT NOT NULL DEFAULT '📚',
  position DOUBLE PRECISION NOT NULL DEFAULT 0,
  created_by UUID REFERENCES users(id) ON DELETE SET NULL,
  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);
CREATE INDEX IF NOT EXISTS idx_books_workspace ON books(workspace_id);

-- Pages can optionally live inside a book (book_id NULL = top-level page)
ALTER TABLE pages ADD COLUMN IF NOT EXISTS book_id UUID REFERENCES books(id) ON DELETE CASCADE;
CREATE INDEX IF NOT EXISTS idx_pages_book ON pages(book_id);

-- Tasks: can link to a book and/or a page, optional deadline (feeds the calendar)
CREATE TABLE IF NOT EXISTS tasks (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  workspace_id UUID NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE,
  book_id UUID REFERENCES books(id) ON DELETE SET NULL,
  page_id UUID REFERENCES pages(id) ON DELETE SET NULL,
  title TEXT NOT NULL CHECK (char_length(title) BETWEEN 1 AND 300),
  status TEXT NOT NULL DEFAULT 'todo' CHECK (status IN ('todo','doing','done')),
  priority TEXT NOT NULL DEFAULT 'normal' CHECK (priority IN ('low','normal','high')),
  due_at TIMESTAMPTZ NULL,
  position DOUBLE PRECISION NOT NULL DEFAULT 0,
  created_by UUID REFERENCES users(id) ON DELETE SET NULL,
  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);
CREATE INDEX IF NOT EXISTS idx_tasks_workspace ON tasks(workspace_id);
CREATE INDEX IF NOT EXISTS idx_tasks_due ON tasks(workspace_id, due_at);

-- Time tracking entries (open entry = running timer, ended_at IS NULL)
CREATE TABLE IF NOT EXISTS time_entries (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  workspace_id UUID NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE,
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  book_id UUID REFERENCES books(id) ON DELETE SET NULL,
  page_id UUID REFERENCES pages(id) ON DELETE SET NULL,
  description TEXT NOT NULL DEFAULT '',
  started_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  ended_at TIMESTAMPTZ NULL,
  duration_seconds INTEGER NULL,
  created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);
CREATE INDEX IF NOT EXISTS idx_time_ws_user ON time_entries(workspace_id, user_id);

-- Ensure workspace owner is always a member with role=owner
CREATE OR REPLACE FUNCTION ensure_owner_membership() RETURNS trigger AS $$
BEGIN
  INSERT INTO workspace_members (workspace_id, user_id, role)
  VALUES (NEW.id, NEW.owner_id, 'owner')
  ON CONFLICT (workspace_id, user_id)
  DO UPDATE SET role = 'owner';
  RETURN NEW;
END;
$$ LANGUAGE plpgsql;

DROP TRIGGER IF EXISTS trg_ensure_owner ON workspaces;
CREATE TRIGGER trg_ensure_owner AFTER INSERT ON workspaces
FOR EACH ROW EXECUTE FUNCTION ensure_owner_membership();

-- Auto-update updated_at
CREATE OR REPLACE FUNCTION touch_updated_at() RETURNS trigger AS $$
BEGIN
  NEW.updated_at = now();
  RETURN NEW;
END;
$$ LANGUAGE plpgsql;

DROP TRIGGER IF EXISTS trg_users_touch ON users;
CREATE TRIGGER trg_users_touch BEFORE UPDATE ON users
FOR EACH ROW EXECUTE FUNCTION touch_updated_at();

DROP TRIGGER IF EXISTS trg_workspaces_touch ON workspaces;
CREATE TRIGGER trg_workspaces_touch BEFORE UPDATE ON workspaces
FOR EACH ROW EXECUTE FUNCTION touch_updated_at();

DROP TRIGGER IF EXISTS trg_pages_touch ON pages;
CREATE TRIGGER trg_pages_touch BEFORE UPDATE ON pages
FOR EACH ROW EXECUTE FUNCTION touch_updated_at();

DROP TRIGGER IF EXISTS trg_books_touch ON books;
CREATE TRIGGER trg_books_touch BEFORE UPDATE ON books
FOR EACH ROW EXECUTE FUNCTION touch_updated_at();

DROP TRIGGER IF EXISTS trg_tasks_touch ON tasks;
CREATE TRIGGER trg_tasks_touch BEFORE UPDATE ON tasks
FOR EACH ROW EXECUTE FUNCTION touch_updated_at();