"""add accounts.sync_window + backfill progress counters

Lets the user choose at account setup how much history to import (SPEC §12 M2):
``all`` (default; recent 30d first, then the rest), ``3months`` (windowed), or
``new`` (no backfill — only mail arriving after setup). ``backfill_total`` /
``backfill_done`` drive the initial-sync progress UX; total 0 means "nothing to
import" (the ``new`` window, or an empty account).

Revision ID: 0012
Revises: 0011
Create Date: 2026-07-23
"""

from __future__ import annotations

from collections.abc import Sequence

from alembic import op

revision: str = "0012"
down_revision: str | None = "0011"
branch_labels: str | Sequence[str] | None = None
depends_on: str | Sequence[str] | None = None


def upgrade() -> None:
    op.execute("ALTER TABLE accounts ADD COLUMN sync_window text NOT NULL DEFAULT 'all'")
    op.execute("ALTER TABLE accounts ADD COLUMN backfill_total integer NOT NULL DEFAULT 0")
    op.execute("ALTER TABLE accounts ADD COLUMN backfill_done integer NOT NULL DEFAULT 0")


def downgrade() -> None:
    op.execute("ALTER TABLE accounts DROP COLUMN IF EXISTS backfill_done")
    op.execute("ALTER TABLE accounts DROP COLUMN IF EXISTS backfill_total")
    op.execute("ALTER TABLE accounts DROP COLUMN IF EXISTS sync_window")