"""IMAP ids as 64-bit integers

UIDVALIDITY and UIDs are unsigned 32-bit numbers (RFC 9051), MODSEQ up to 63
bits (RFC 7162); Postgres ``integer`` is signed 32-bit. Servers that hand out
values above 2^31 — the hosted mail server's UIDVALIDITY, for one — could not
be stored ("value out of int32 range") and their folders never synced.

Revision ID: 0026
Revises: 0025
Create Date: 2026-10-11
"""

from __future__ import annotations

from collections.abc import Sequence

from alembic import op

revision: str = "0026"
down_revision: str | None = "0025"
branch_labels: str | Sequence[str] | None = None
depends_on: str | Sequence[str] | None = None

_COLUMNS = (
    ("mailboxes", "uidvalidity"),
    ("mailboxes", "highestmodseq"),
    ("mailboxes", "last_seen_uid"),
    ("messages", "uid"),
    ("drafts", "imap_uid"),
)


def upgrade() -> None:
    for table, column in _COLUMNS:
        op.execute(f"ALTER TABLE {table} ALTER COLUMN {column} TYPE bigint")


def downgrade() -> None:
    for table, column in _COLUMNS:
        op.execute(f"ALTER TABLE {table} ALTER COLUMN {column} TYPE integer")