"""V15 T+ 持久化任务、幂等和重试元数据。"""

from collections.abc import Sequence

from alembic import op
import sqlalchemy as sa
from sqlalchemy.dialects.mysql import BIGINT

revision: str = "e5f607a8b9c0"
down_revision: str | Sequence[str] | None = "d4e5f6a7b8c9"
branch_labels: str | Sequence[str] | None = None
depends_on: str | Sequence[str] | None = None


def upgrade() -> None:
    """仅扩展管理元数据，不改原始暂存行或工资业务表。"""
    op.add_column(
        "tplus_sync_batches",
        sa.Column("entity_types_json", sa.JSON(), comment="请求读取的实体类型；历史批次可为空"),
    )
    op.add_column(
        "tplus_sync_batches",
        sa.Column(
            "skipped_record_count",
            sa.Integer(),
            nullable=False,
            server_default="0",
            comment="重复快照跳过条数",
        ),
    )
    op.add_column(
        "tplus_sync_batches",
        sa.Column("parent_batch_no", sa.String(32), comment="重试来源批次号，保留原批次记录"),
    )
    op.add_column(
        "tplus_sync_batches",
        sa.Column("request_key", sa.String(36), comment="请求幂等键，空值用于历史和直接CLI任务"),
    )
    op.add_column(
        "tplus_sync_batches",
        sa.Column(
            "requested_by", BIGINT(unsigned=True), comment="请求用户ID，CLI任务为空，无物理外键"
        ),
    )
    op.add_column(
        "tplus_sync_batches",
        sa.Column("audit_result_json", sa.JSON(), comment="关联核验结果，只含系统字典和汇总"),
    )
    op.alter_column(
        "tplus_sync_batches",
        "started_at",
        existing_type=sa.DateTime(),
        nullable=True,
        comment="开始执行时间（排队时为空）",
    )
    op.alter_column(
        "tplus_sync_batches",
        "sync_mode",
        existing_type=sa.String(16),
        nullable=False,
        comment="任务方式：FULL全量 AUDIT关联核验 INCREMENTAL预留",
    )
    op.alter_column(
        "tplus_sync_batches",
        "status",
        existing_type=sa.String(16),
        nullable=False,
        comment="状态：QUEUED/RUNNING/SUCCEEDED/PARTIAL/FAILED",
    )
    op.create_unique_constraint(
        "uk_tplus_sync_batches_request_key", "tplus_sync_batches", ["request_key"]
    )
    op.create_index(
        "idx_tplus_sync_batches_parent_status", "tplus_sync_batches", ["parent_batch_no", "status"]
    )
    op.execute(
        "UPDATE tplus_sync_batches SET skipped_record_count=GREATEST(0, source_record_count-staged_record_count-failed_record_count) WHERE status='SUCCEEDED' AND sync_mode='FULL'"
    )


def downgrade() -> None:
    """回滚前关闭 worker；原始暂存数据和历史批次仍保留。"""
    op.execute(
        "UPDATE tplus_sync_batches SET started_at=create_time, status='FAILED', finished_at=CURRENT_TIMESTAMP, error_message='任务管理版本已回滚' WHERE status='QUEUED'"
    )
    op.execute("UPDATE tplus_sync_batches SET started_at=create_time WHERE started_at IS NULL")
    op.drop_index("idx_tplus_sync_batches_parent_status", table_name="tplus_sync_batches")
    op.drop_constraint("uk_tplus_sync_batches_request_key", "tplus_sync_batches", type_="unique")
    for name in (
        "audit_result_json",
        "requested_by",
        "request_key",
        "parent_batch_no",
        "skipped_record_count",
        "entity_types_json",
    ):
        op.drop_column("tplus_sync_batches", name)
    op.alter_column(
        "tplus_sync_batches",
        "started_at",
        existing_type=sa.DateTime(),
        nullable=False,
        comment="开始读取时间",
    )
    op.alter_column(
        "tplus_sync_batches",
        "sync_mode",
        existing_type=sa.String(16),
        nullable=False,
        comment="同步模式：FULL全量 INCREMENTAL增量",
    )
    op.alter_column(
        "tplus_sync_batches",
        "status",
        existing_type=sa.String(16),
        nullable=False,
        comment="状态：RUNNING/SUCCEEDED/PARTIAL/FAILED",
    )