"""library: a resume point per user and library item

The library player opened every item at 0:00. `library_states` keeps where a user stopped, per job
(their own download, or one shared with them) — the same shape as `video_states`' position, without a
status: the library has no "watched". It starts empty; the downgrade drops it.
"""

import sqlalchemy as sa
from alembic import op

revision: str = "0099_library_states"
down_revision: str | None = "0098_drop_demo_account"
branch_labels: str | None = None
depends_on: str | None = None


def upgrade() -> None:
    op.create_table(
        "library_states",
        sa.Column("id", sa.Integer(), primary_key=True),
        sa.Column(
            "user_id",
            sa.Integer(),
            sa.ForeignKey("users.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column(
            "job_id",
            sa.Integer(),
            sa.ForeignKey("download_jobs.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column("position_seconds", sa.Integer(), nullable=False),
        sa.Column("progress_updated_at", sa.DateTime(timezone=True), nullable=False),
        sa.UniqueConstraint("user_id", "job_id", name="uq_library_user_job"),
    )
    op.create_index("ix_library_states_job_id", "library_states", ["job_id"])


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