"""add persistent background jobs

Revision ID: b5d2c9a3e1f7
Revises: a41e8c7f4b20
Create Date: 2026-08-30 12:00:00
"""
from __future__ import annotations

from alembic import op
import sqlalchemy as sa


revision = "b5d2c9a3e1f7"
down_revision = "a41e8c7f4b20"
branch_labels = None
depends_on = None


def upgrade() -> None:
    # 开发态 FastAPI 会在 startup 以 Base.metadata.create_all 兜底；若它先于 Alembic
    # 启动，表已完整存在，此处只补迁移版本记录，避免 create_table 冲突。
    inspector = sa.inspect(op.get_bind())
    if "background_jobs" in inspector.get_table_names():
        # 开发态若先由 metadata.create_all 建表，仍补上后来新增的索引。
        existing_indexes = {
            index["name"] for index in inspector.get_indexes("background_job_items")
        }
        if "ix_background_job_items_updated_at" not in existing_indexes:
            op.create_index("ix_background_job_items_updated_at", "background_job_items", ["updated_at"])
        return
    op.create_table(
        "background_jobs",
        sa.Column("id", sa.Uuid(), nullable=False),
        sa.Column("product_id", sa.Uuid(), nullable=True),
        sa.Column("kind", sa.String(length=32), nullable=False),
        sa.Column("status", sa.String(length=24), nullable=False, server_default="queued"),
        sa.Column("priority", sa.Integer(), nullable=False, server_default="0"),
        sa.Column("provider", sa.String(length=32), nullable=False, server_default=""),
        sa.Column("model", sa.String(length=128), nullable=True),
        sa.Column("platform", sa.String(length=16), nullable=False, server_default="ozon"),
        sa.Column("lang", sa.String(length=16), nullable=False, server_default="ru"),
        sa.Column("ratio", sa.String(length=16), nullable=False, server_default="3:4"),
        sa.Column("style_set", sa.Integer(), nullable=False, server_default="1"),
        sa.Column("request_payload", sa.JSON(), nullable=False),
        sa.Column("total", sa.Integer(), nullable=False, server_default="0"),
        sa.Column("completed", sa.Integer(), nullable=False, server_default="0"),
        sa.Column("failed", sa.Integer(), nullable=False, server_default="0"),
        sa.Column("cancel_requested", sa.Boolean(), nullable=False, server_default=sa.false()),
        sa.Column("error", sa.Text(), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("CURRENT_TIMESTAMP"), nullable=False),
        sa.Column("started_at", sa.DateTime(timezone=True), nullable=True),
        sa.Column("completed_at", sa.DateTime(timezone=True), nullable=True),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.text("CURRENT_TIMESTAMP"), nullable=False),
        sa.ForeignKeyConstraint(["product_id"], ["products.id"], ondelete="SET NULL"),
        sa.PrimaryKeyConstraint("id"),
    )
    op.create_index("ix_background_jobs_product_id", "background_jobs", ["product_id"])
    op.create_index("ix_background_jobs_kind", "background_jobs", ["kind"])
    op.create_index("ix_background_jobs_status", "background_jobs", ["status"])
    op.create_index("ix_background_jobs_priority", "background_jobs", ["priority"])
    op.create_index("ix_background_jobs_cancel_requested", "background_jobs", ["cancel_requested"])
    op.create_index("ix_background_jobs_created_at", "background_jobs", ["created_at"])
    op.create_index("ix_background_jobs_updated_at", "background_jobs", ["updated_at"])
    op.create_table(
        "background_job_items",
        sa.Column("id", sa.Uuid(), nullable=False),
        sa.Column("job_id", sa.Uuid(), nullable=False),
        sa.Column("position", sa.Integer(), nullable=False, server_default="0"),
        sa.Column("status", sa.String(length=24), nullable=False, server_default="queued"),
        sa.Column("payload", sa.JSON(), nullable=False),
        sa.Column("provider_task_id", sa.String(length=512), nullable=True),
        sa.Column("provider_task_kind", sa.String(length=64), nullable=True),
        sa.Column("attempts", sa.Integer(), nullable=False, server_default="0"),
        sa.Column("max_attempts", sa.Integer(), nullable=False, server_default="3"),
        sa.Column("result_url", sa.Text(), nullable=True),
        sa.Column("source_url", sa.Text(), nullable=True),
        sa.Column("watermark_config", sa.JSON(), nullable=True),
        sa.Column("generated_asset_id", sa.Uuid(), nullable=True),
        sa.Column("error", sa.Text(), nullable=True),
        sa.Column("next_run_at", sa.DateTime(timezone=True), nullable=True),
        sa.Column("lease_owner", sa.String(length=128), nullable=True),
        sa.Column("lease_expires_at", sa.DateTime(timezone=True), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("CURRENT_TIMESTAMP"), nullable=False),
        sa.Column("started_at", sa.DateTime(timezone=True), nullable=True),
        sa.Column("completed_at", sa.DateTime(timezone=True), nullable=True),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.text("CURRENT_TIMESTAMP"), nullable=False),
        sa.ForeignKeyConstraint(["job_id"], ["background_jobs.id"], ondelete="CASCADE"),
        sa.PrimaryKeyConstraint("id"),
    )
    op.create_index("ix_background_job_items_job_id", "background_job_items", ["job_id"])
    op.create_index("ix_background_job_items_status", "background_job_items", ["status"])
    op.create_index("ix_background_job_items_provider_task_id", "background_job_items", ["provider_task_id"])
    op.create_index("ix_background_job_items_next_run_at", "background_job_items", ["next_run_at"])
    op.create_index("ix_background_job_items_lease_expires_at", "background_job_items", ["lease_expires_at"])
    op.create_index("ix_background_job_items_updated_at", "background_job_items", ["updated_at"])


def downgrade() -> None:
    op.drop_index("ix_background_job_items_updated_at", table_name="background_job_items")
    op.drop_table("background_job_items")
    op.drop_table("background_jobs")