const createVehiclesTableSql = '''
  CREATE TABLE vehicles (
    id TEXT PRIMARY KEY,
    make TEXT NOT NULL,
    model TEXT NOT NULL,
    color TEXT NOT NULL,
    license_plate TEXT NOT NULL,
    updated_at INTEGER NOT NULL,
    deleted_at INTEGER,
    dirty INTEGER NOT NULL DEFAULT 1
  )
''';

const createFuelEntriesTableSql = '''
  CREATE TABLE fuel_entries (
    id TEXT PRIMARY KEY,
    vehicle_id TEXT NOT NULL,
    date INTEGER NOT NULL,
    gallons REAL NOT NULL,
    price_per_gallon REAL NOT NULL,
    total_cost REAL NOT NULL,
    receipt_image_path TEXT,
    receipt_drive_file_id TEXT,
    updated_at INTEGER NOT NULL,
    deleted_at INTEGER,
    dirty INTEGER NOT NULL DEFAULT 1
  )
''';

const createFuelEntriesIndexSql =
    'CREATE INDEX idx_fuel_entries_vehicle_id ON fuel_entries(vehicle_id)';

/// Merges attached `remote_db` rows into `main` (the live local database):
/// any remote row that's new to us, or newer than our copy, replaces ours.
/// Rows this doesn't touch — including our own not-yet-pushed edits — are
/// left alone, since the WHERE clause only matches rows remote should win;
/// no separate "keep local" statement is needed.
const mergeVehiclesSql = '''
  INSERT OR REPLACE INTO main.vehicles
    (id, make, model, color, license_plate, updated_at, deleted_at, dirty)
  SELECT r.id, r.make, r.model, r.color, r.license_plate, r.updated_at, r.deleted_at, 0
  FROM remote_db.vehicles r
  LEFT JOIN main.vehicles l ON l.id = r.id
  WHERE l.id IS NULL OR r.updated_at > l.updated_at
''';

/// Same rule as [mergeVehiclesSql]. `receipt_image_path` is always forced
/// to NULL on the merged-in copy — it's a local filesystem path, meaningless
/// (and never valid) on another device, and rows are only ever pushed to
/// Drive once their pending receipt has already been uploaded there, so a
/// remote row should never legitimately have one anyway.
const mergeFuelEntriesSql = '''
  INSERT OR REPLACE INTO main.fuel_entries
    (id, vehicle_id, date, gallons, price_per_gallon, total_cost,
     receipt_image_path, receipt_drive_file_id, updated_at, deleted_at, dirty)
  SELECT r.id, r.vehicle_id, r.date, r.gallons, r.price_per_gallon, r.total_cost,
         NULL, r.receipt_drive_file_id, r.updated_at, r.deleted_at, 0
  FROM remote_db.fuel_entries r
  LEFT JOIN main.fuel_entries l ON l.id = r.id
  WHERE l.id IS NULL OR r.updated_at > l.updated_at
''';