"""审计日志 API —— 查看系统操作审计记录

与 MOM(KCGL) /audit/logs 的接口保持同构的筛选维度（操作人/模块/动作/目标/
时间区间），便于两端运维习惯统一；额外提供 request_id 筛选，可凭它直接跳到
结构化日志里的那一次请求。
"""
from __future__ import annotations

from datetime import datetime, time, timedelta

from fastapi import APIRouter, Depends, Query
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.database import get_db
from app.core.deps import require_admin
from app.core.time_utils import BEIJING_TZ
from app.schemas.audit import (
    AuditLogListResponse,
    AuditLogResponse,
    AuditOption,
    AuditOptionsResponse,
)
from app.services import audit_service
from app.services.audit_service import ACTION_LABELS, MODULE_LABELS

router = APIRouter(prefix="/audit", tags=["审计日志"])


def _parse_day(value: str | None, *, end_of_day: bool = False) -> datetime | None:
    """解析 YYYY-MM-DD 为北京时间。

    结束日期取次日 00:00 作为上界（配合 < 判断）—— 直接取当天 23:59:59 会
    漏掉该秒内的记录，是日期区间筛选最常见的差一错误。
    """
    if not value:
        return None
    try:
        day = datetime.strptime(value, "%Y-%m-%d").date()
    except ValueError:
        return None
    if end_of_day:
        return datetime.combine(day + timedelta(days=1), time.min, tzinfo=BEIJING_TZ)
    return datetime.combine(day, time.min, tzinfo=BEIJING_TZ)


@router.get("/logs", response_model=AuditLogListResponse)
async def get_audit_logs(
    user_id: str | None = Query(None, description="操作人账号（模糊匹配）"),
    module: str | None = Query(None, description="业务模块"),
    action: str | None = Query(None, description="动作类型"),
    target_id: str | None = Query(None, description="目标ID"),
    request_id: str | None = Query(None, description="请求ID（与接口日志对账）"),
    status_code: int | None = Query(None, description="响应状态码"),
    start_date: str | None = Query(None, description="起始日期 YYYY-MM-DD"),
    end_date: str | None = Query(None, description="结束日期 YYYY-MM-DD（含当天）"),
    page: int = Query(1, ge=1),
    page_size: int = Query(50, ge=1, le=200),
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_admin),
) -> AuditLogListResponse:
    """审计日志分页查询（按时间倒序）"""
    start = _parse_day(start_date)
    # 结束日期用「次日 00:00」作为开区间上界，避免漏掉当天最后几条
    end_exclusive = _parse_day(end_date, end_of_day=True)

    rows, total = await audit_service.list_audit_logs(
        db,
        user_id=user_id,
        module=module,
        action=action,
        target_id=target_id,
        request_id=request_id,
        status_code=status_code,
        start=start,
        end=end_exclusive - timedelta(microseconds=1) if end_exclusive else None,
        skip=(page - 1) * page_size,
        limit=page_size,
    )

    items = []
    for row in rows:
        item = AuditLogResponse.model_validate(row)
        # 中文标签由服务端补，避免前端为每个枚举再维护一份映射
        item.module_label = MODULE_LABELS.get(row.module, row.module)
        item.action_label = ACTION_LABELS.get(row.action, row.action)
        items.append(item)

    return AuditLogListResponse(items=items, total=total)


@router.get("/options", response_model=AuditOptionsResponse)
async def get_audit_options(
    current_user: dict = Depends(require_admin),
) -> AuditOptionsResponse:
    """筛选项：模块与动作的中文下拉"""
    return AuditOptionsResponse(
        modules=[AuditOption(value=k, label=v) for k, v in MODULE_LABELS.items()],
        actions=[AuditOption(value=k, label=v) for k, v in ACTION_LABELS.items()],
    )