"""per-user saved smart views

Revision ID: 0035_saved_views
Revises: 0034_blocked_channels
Create Date: 2026-07-01

Adds the `saved_views` table: per-user named snapshots of the feed's filter/sort state. Each
row stores the serialized FeedFilters (JSON), a sidebar `position` for drag-reorder, and an
`is_default` flag (at most one per user, enforced by the API) for the view applied on load.
"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op

revision: str = "0035_saved_views"
down_revision: Union[str, None] = "0034_blocked_channels"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "saved_views",
        sa.Column("id", sa.Integer(), nullable=False),
        sa.Column("user_id", sa.Integer(), nullable=False),
        sa.Column("name", sa.String(length=80), nullable=False),
        sa.Column("filters", sa.JSON(), nullable=False),
        sa.Column(
            "position", sa.Integer(), server_default=sa.text("0"), nullable=False
        ),
        sa.Column(
            "is_default",
            sa.Boolean(),
            server_default=sa.text("false"),
            nullable=False,
        ),
        sa.Column(
            "created_at",
            sa.DateTime(timezone=True),
            server_default=sa.text("now()"),
            nullable=False,
        ),
        sa.Column(
            "updated_at",
            sa.DateTime(timezone=True),
            server_default=sa.text("now()"),
            nullable=False,
        ),
        sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
        sa.PrimaryKeyConstraint("id"),
        sa.UniqueConstraint("user_id", "name", name="uq_user_saved_view"),
    )
    op.create_index("ix_saved_views_user_id", "saved_views", ["user_id"])


def downgrade() -> None:
    op.drop_index("ix_saved_views_user_id", table_name="saved_views")
    op.drop_table("saved_views")