CREATE TABLE IF NOT EXISTS households (
  id         INTEGER PRIMARY KEY AUTOINCREMENT,
  name       TEXT NOT NULL,
  created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now'))
);

CREATE TABLE IF NOT EXISTS parents (
  id            INTEGER PRIMARY KEY AUTOINCREMENT,
  household_id  INTEGER NOT NULL REFERENCES households(id) ON DELETE CASCADE,
  email         TEXT NOT NULL UNIQUE COLLATE NOCASE,
  password_hash TEXT NOT NULL,
  name          TEXT NOT NULL,
  created_at    TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now'))
);
CREATE INDEX IF NOT EXISTS idx_parents_household ON parents(household_id);

CREATE TABLE IF NOT EXISTS household_invites (
  id                    INTEGER PRIMARY KEY AUTOINCREMENT,
  household_id          INTEGER NOT NULL REFERENCES households(id) ON DELETE CASCADE,
  token                 TEXT NOT NULL UNIQUE,
  created_by_parent_id  INTEGER NOT NULL REFERENCES parents(id) ON DELETE CASCADE,
  expires_at            TEXT NOT NULL,
  used_at               TEXT,
  used_by_parent_id     INTEGER REFERENCES parents(id),
  created_at            TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now'))
);
CREATE INDEX IF NOT EXISTS idx_invites_household ON household_invites(household_id);

CREATE TABLE IF NOT EXISTS children (
  id                  INTEGER PRIMARY KEY AUTOINCREMENT,
  household_id        INTEGER NOT NULL REFERENCES households(id) ON DELETE CASCADE,
  name                TEXT NOT NULL,
  kiosk_token         TEXT NOT NULL UNIQUE,
  active_calendar_id  INTEGER REFERENCES calendars(id) ON DELETE SET NULL,
  created_at          TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now'))
);
CREATE INDEX IF NOT EXISTS idx_children_household ON children(household_id);

CREATE TABLE IF NOT EXISTS calendars (
  id               INTEGER PRIMARY KEY AUTOINCREMENT,
  child_id         INTEGER NOT NULL REFERENCES children(id) ON DELETE CASCADE,
  title            TEXT NOT NULL,
  week_start_date  TEXT,
  show_weekend     INTEGER NOT NULL DEFAULT 0,
  updated_at       TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now')),
  created_at       TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now'))
);
CREATE INDEX IF NOT EXISTS idx_calendars_child ON calendars(child_id);

CREATE TABLE IF NOT EXISTS calendar_blocks (
  calendar_id INTEGER NOT NULL REFERENCES calendars(id) ON DELETE CASCADE,
  block_key   TEXT NOT NULL CHECK (block_key IN ('morning','school','after','evening')),
  label       TEXT NOT NULL,
  PRIMARY KEY (calendar_id, block_key)
);

CREATE TABLE IF NOT EXISTS calendar_tasks (
  id          INTEGER PRIMARY KEY AUTOINCREMENT,
  calendar_id INTEGER NOT NULL REFERENCES calendars(id) ON DELETE CASCADE,
  day_of_week TEXT NOT NULL CHECK (day_of_week IN
              ('Monday','Tuesday','Wednesday','Thursday','Friday','Saturday','Sunday')),
  block_key   TEXT NOT NULL CHECK (block_key IN ('morning','school','after','evening')),
  text        TEXT NOT NULL,
  done        INTEGER NOT NULL DEFAULT 0,
  sort_order  INTEGER NOT NULL DEFAULT 0,
  updated_at  TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now')),
  created_at  TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now'))
);
CREATE INDEX IF NOT EXISTS idx_tasks_calendar ON calendar_tasks(calendar_id, day_of_week, block_key);

CREATE TABLE IF NOT EXISTS sessions (
  sid        TEXT PRIMARY KEY,
  sess       TEXT NOT NULL,
  expires_at INTEGER NOT NULL
);
CREATE INDEX IF NOT EXISTS idx_sessions_expires ON sessions(expires_at);