"""Phase 5b: Öffentliche Ansichtslinks und Zusatzrecht zum Teilen

Revision ID: 0005
Revises: 0004
Create Date: 2026-08-08
"""
from collections.abc import Sequence

import sqlalchemy as sa
from alembic import op

revision: str = "0005"
down_revision: str | None = "0004"
branch_labels: str | Sequence[str] | None = None
depends_on: str | Sequence[str] | None = None


def upgrade() -> None:
    op.add_column(
        "list_member",
        sa.Column(
            "may_share_public", sa.Boolean(), nullable=False,
            server_default=sa.text("0"),
        ),
    )
    # Eigentuemer haben das Recht immer - der Vollstaendigkeit halber
    # auch in der Spalte, damit Abfragen einheitlich bleiben.
    op.execute("UPDATE list_member SET may_share_public = 1 WHERE role = 'owner'")

    op.create_table(
        "public_share",
        sa.Column("id", sa.String(36), primary_key=True),
        sa.Column("list_id", sa.String(36), nullable=False),
        sa.Column("token_hash", sa.String(64), nullable=False),
        sa.Column("label", sa.String(120), nullable=True),
        sa.Column("allow_check", sa.Boolean(), nullable=False, server_default=sa.text("1")),
        sa.Column("created_by", sa.String(36), nullable=True),
        sa.Column("created_at", sa.DateTime(), nullable=False, server_default=sa.func.now()),
        sa.Column("expires_at", sa.DateTime(), nullable=False),
        sa.Column("revoked_at", sa.DateTime(), nullable=True),
        sa.Column("last_access_at", sa.DateTime(), nullable=True),
        sa.Column("access_count", sa.Integer(), nullable=False, server_default=sa.text("0")),
        sa.ForeignKeyConstraint(["list_id"], ["shopping_list.id"], ondelete="CASCADE"),
        sa.ForeignKeyConstraint(["created_by"], ["user.id"], ondelete="SET NULL"),
        sa.UniqueConstraint("token_hash", name="uq_public_share_token"),
        mysql_engine="InnoDB",
        mysql_charset="utf8mb4",
        mysql_collate="utf8mb4_unicode_ci",
    )
    op.create_index("ix_public_share_list", "public_share", ["list_id"])


def downgrade() -> None:
    op.drop_index("ix_public_share_list", table_name="public_share")
    op.drop_table("public_share")
    op.drop_column("list_member", "may_share_public")