"""Phase 5: Einladungen, Eigentümerwechsel, Ersteller je Eintrag

Revision ID: 0004
Revises: 0003
Create Date: 2026-08-08
"""
from collections.abc import Sequence

import sqlalchemy as sa
from alembic import op

revision: str = "0004"
down_revision: str | None = "0003"
branch_labels: str | Sequence[str] | None = None
depends_on: str | Sequence[str] | None = None


def upgrade() -> None:
    op.add_column(
        "list_item",
        sa.Column("created_by", sa.String(36), nullable=True),
    )
    op.create_foreign_key(
        "fk_list_item_created_by", "list_item", "user",
        ["created_by"], ["id"], ondelete="SET NULL",
    )

    op.create_table(
        "list_invite",
        sa.Column("id", sa.String(36), primary_key=True),
        sa.Column("list_id", sa.String(36), nullable=False),
        sa.Column("email", sa.String(255), nullable=False),
        sa.Column("role", sa.String(16), nullable=False, server_default="editor"),
        sa.Column("token_hash", sa.String(64), nullable=False),
        sa.Column("invited_by", sa.String(36), nullable=True),
        sa.Column("created_at", sa.DateTime(), nullable=False, server_default=sa.func.now()),
        sa.Column("last_sent_at", sa.DateTime(), nullable=False, server_default=sa.func.now()),
        sa.Column("send_count", sa.Integer(), nullable=False, server_default=sa.text("1")),
        sa.Column("expires_at", sa.DateTime(), nullable=False),
        sa.Column("accepted_at", sa.DateTime(), nullable=True),
        sa.Column("accepted_by", sa.String(36), nullable=True),
        sa.Column("revoked_at", sa.DateTime(), nullable=True),
        sa.ForeignKeyConstraint(["list_id"], ["shopping_list.id"], ondelete="CASCADE"),
        sa.ForeignKeyConstraint(["invited_by"], ["user.id"], ondelete="SET NULL"),
        sa.ForeignKeyConstraint(["accepted_by"], ["user.id"], ondelete="SET NULL"),
        sa.UniqueConstraint("token_hash", name="uq_list_invite_token"),
        mysql_engine="InnoDB",
        mysql_charset="utf8mb4",
        mysql_collate="utf8mb4_unicode_ci",
    )
    op.create_index("ix_list_invite_list", "list_invite", ["list_id"])
    op.create_index("ix_list_invite_email", "list_invite", ["email"])


def downgrade() -> None:
    op.drop_index("ix_list_invite_email", table_name="list_invite")
    op.drop_index("ix_list_invite_list", table_name="list_invite")
    op.drop_table("list_invite")
    op.drop_constraint("fk_list_item_created_by", "list_item", type_="foreignkey")
    op.drop_column("list_item", "created_by")