-- Local SQLite schema (Room). No server, no accounts, no network: all data stays on the device.
-- Instants are INTEGER epoch milliseconds UTC. Alarm times are wall-clock (hour, minute) in the device zone.

CREATE TABLE alarms (
  id              INTEGER PRIMARY KEY AUTOINCREMENT,
  hour            INTEGER NOT NULL CHECK (hour BETWEEN 0 AND 23),
  minute          INTEGER NOT NULL CHECK (minute BETWEEN 0 AND 59),
  enabled         INTEGER NOT NULL DEFAULT 1 CHECK (enabled IN (0,1)),
  days            INTEGER NOT NULL DEFAULT 0 CHECK (days BETWEEN 0 AND 127), -- bit 0 = Monday … bit 6 = Sunday; 0 = once
  label           TEXT    NOT NULL DEFAULT '',
  ringtone_uri    TEXT,                                  -- NULL = default alarm sound, 'silent' = none
  vibrate         INTEGER NOT NULL DEFAULT 1 CHECK (vibrate IN (0,1)),
  skip_until      TEXT,                                  -- ISO date: paused until (inclusive)
  is_bedtime_wake INTEGER NOT NULL DEFAULT 0 CHECK (is_bedtime_wake IN (0,1)),
  created_at      INTEGER NOT NULL,
  updated_at      INTEGER NOT NULL
);
CREATE INDEX alarms_time ON alarms(hour, minute);
CREATE UNIQUE INDEX alarms_one_bedtime ON alarms(is_bedtime_wake) WHERE is_bedtime_wake = 1;

-- The next concrete ring of an alarm. Exactly one row per enabled alarm; rewritten after every change,
-- reboot, time or time zone change. Snooze and "dismiss early" live here, not on the alarm.
CREATE TABLE alarm_instances (
  alarm_id   INTEGER PRIMARY KEY REFERENCES alarms(id) ON DELETE CASCADE,
  fire_at    INTEGER NOT NULL,
  state      TEXT    NOT NULL DEFAULT 'scheduled'
             CHECK (state IN ('scheduled','snoozed','ringing','missed','dismissed')),
  updated_at INTEGER NOT NULL
);
CREATE INDEX alarm_instances_fire ON alarm_instances(state, fire_at);

CREATE TABLE timers (
  id           INTEGER PRIMARY KEY AUTOINCREMENT,
  label        TEXT    NOT NULL DEFAULT '',
  duration_ms  INTEGER NOT NULL CHECK (duration_ms > 0),
  remaining_ms INTEGER NOT NULL CHECK (remaining_ms >= 0),  -- valid while paused/idle
  end_at       INTEGER,                                       -- set while running
  state        TEXT    NOT NULL DEFAULT 'running' CHECK (state IN ('running','paused','ringing','idle')),
  created_at   INTEGER NOT NULL,
  CHECK ((state = 'running') = (end_at IS NOT NULL))
);
CREATE INDEX timers_state ON timers(state, end_at);

CREATE TABLE cities (
  id         INTEGER PRIMARY KEY AUTOINCREMENT,
  zone_id    TEXT    NOT NULL UNIQUE,   -- IANA, e.g. Europe/Paris
  name       TEXT    NOT NULL,
  sort_order INTEGER NOT NULL DEFAULT 0
);
CREATE INDEX cities_sort ON cities(sort_order);

-- Single stopwatch and bedtime schedule live in DataStore (one instance each, no relations):
--   stopwatch: state (idle|running|stopped), started_at_elapsed, accumulated_ms, laps (json array of ms)
--   bedtime:   enabled, bed_hour, bed_minute, days, reminder_min, sunrise, sleep_sound
--   settings:  silence_after_min, snooze_min, alarm_volume, gradual_volume_s, volume_buttons,
--              week_start, home_zone, auto_home_clock, clock_style, show_seconds,
--              timer_sound, timer_vibrate, night_mode, theme