"""email translation: a message's detected language, and translations kept

``messages.content_language``: NULL until the message is first shown, '' when
the language could not be told. ``message_translations``: one translated HTML
per message, target language and remote-images choice (app/translation.py);
dropped with the message.

Revision ID: 0030
Revises: 0029
Create Date: 2026-10-18
"""

from __future__ import annotations

from collections.abc import Sequence

from alembic import op

revision: str = "0030"
down_revision: str | None = "0029"
branch_labels: str | Sequence[str] | None = None
depends_on: str | Sequence[str] | None = None


def upgrade() -> None:
    op.execute("ALTER TABLE messages ADD COLUMN content_language text")
    op.execute(
        """
        CREATE TABLE message_translations (
          message_id uuid NOT NULL REFERENCES messages(id) ON DELETE CASCADE,
          target text NOT NULL,
          images boolean NOT NULL,
          source text NOT NULL,
          html text NOT NULL,
          sanitizer_v integer NOT NULL,
          created_at timestamptz NOT NULL DEFAULT now(),
          PRIMARY KEY (message_id, target, images)
        )
        """
    )


def downgrade() -> None:
    op.execute("DROP TABLE IF EXISTS message_translations")
    op.execute("ALTER TABLE messages DROP COLUMN IF EXISTS content_language")