"""Audit rule management endpoints."""
from typing import Optional, List

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

from app.core.database import get_db
from app.core.security import require_role
from app.models.user import User
from app.models.audit_rule import AuditRule
from app.schemas.audit_rule import AuditRuleCreate, AuditRuleUpdate, AuditRuleResponse
from app.services.audit_rule_seeds import SEED_RULES_MAP
from app.services.audit_rule_seeds_v2 import seed_all_rules

router = APIRouter(prefix="/audit-rules", tags=["审核规则"])


@router.get("", response_model=List[AuditRuleResponse])
async def list_audit_rules(
    rule_type: Optional[str] = None,
    severity: Optional[str] = None,
    db_type: Optional[str] = None,
    is_enabled: Optional[bool] = None,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(require_role("admin", "dba")),
):
    stmt = select(AuditRule).order_by(AuditRule.id)
    if rule_type:
        stmt = stmt.where(AuditRule.rule_type == rule_type)
    if severity:
        stmt = stmt.where(AuditRule.severity == severity)
    if db_type:
        # 支持类型别名: postgresql -> postgres, mongo -> mongodb
        db_type_aliases = {"postgresql": "postgres", "pg": "postgres", "mongo": "mongodb"}
        resolved = db_type_aliases.get(db_type.lower(), db_type.lower())
        stmt = stmt.where((AuditRule.db_type == resolved) | (AuditRule.db_type == db_type) | (AuditRule.db_type == "all"))
    if is_enabled is not None:
        stmt = stmt.where(AuditRule.is_enabled == is_enabled)

    result = await db.execute(stmt)
    return result.scalars().all()


@router.post("", response_model=AuditRuleResponse, status_code=201)
async def create_audit_rule(
    data: AuditRuleCreate,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(require_role("admin")),
):
    exists = await db.execute(select(AuditRule).where(AuditRule.name == data.name))
    if exists.scalar_one_or_none():
        raise HTTPException(status_code=400, detail="规则名称已存在")

    rule = AuditRule(**data.model_dump())
    db.add(rule)
    await db.commit()
    await db.refresh(rule)
    return rule


@router.get("/stats/summary")
async def rule_stats(
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(require_role("admin", "dba")),
):
    total_stmt = select(func.count(AuditRule.id))
    total = (await db.execute(total_stmt)).scalar()

    enabled_stmt = select(func.count(AuditRule.id)).where(AuditRule.is_enabled == True)
    enabled = (await db.execute(enabled_stmt)).scalar()

    type_stmt = select(AuditRule.rule_type, func.count(AuditRule.id)).group_by(AuditRule.rule_type)
    type_result = (await db.execute(type_stmt)).all()
    by_type = {row[0]: row[1] for row in type_result}

    return {"total": total, "enabled": enabled, "disabled": total - enabled, "by_type": by_type}


@router.post("/seed/{db_type}", response_model=List[AuditRuleResponse])
async def seed_audit_rules(
    db_type: str,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(require_role("admin")),
):
    """批量初始化预设审核规则种子数据。

    支持4种数据库类型:
    - mysql: MySQL 专用规则 (60+ 条)
    - postgres: PostgreSQL 专用规则 (45+ 条)
    - redis: Redis 专用规则 (43+ 条)
    - mongodb: MongoDB 专用规则 (42+ 条)
    """
    db_type_lower = db_type.lower()
    # 别名映射
    db_type_aliases = {
        "postgresql": "postgres",
        "pg": "postgres",
        "mongo": "mongodb",
    }
    db_type_lower = db_type_aliases.get(db_type_lower, db_type_lower)

    if db_type_lower not in SEED_RULES_MAP:
        raise HTTPException(
            status_code=400,
            detail=f"不支持的数据库类型: {db_type}，支持: {', '.join(SEED_RULES_MAP.keys())}",
        )

    seed_data = SEED_RULES_MAP[db_type_lower]
    created: List[AuditRule] = []

    for rule_dict in seed_data:
        # 检查是否已存在（按 name 去重）
        exists = await db.execute(select(AuditRule).where(AuditRule.name == rule_dict["name"]))
        if exists.scalar_one_or_none():
            continue  # 跳过已存在的规则

        rule = AuditRule(**rule_dict)
        db.add(rule)
        created.append(rule)

    await db.commit()
    for rule in created:
        await db.refresh(rule)

    return created


@router.get("/{rule_id}", response_model=AuditRuleResponse)
async def get_audit_rule(
    rule_id: int,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(require_role("admin", "dba")),
):
    result = await db.execute(select(AuditRule).where(AuditRule.id == rule_id))
    rule = result.scalar_one_or_none()
    if not rule:
        raise HTTPException(status_code=404, detail="规则不存在")
    return rule


@router.put("/{rule_id}", response_model=AuditRuleResponse)
async def update_audit_rule(
    rule_id: int,
    data: AuditRuleUpdate,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(require_role("admin")),
):
    result = await db.execute(select(AuditRule).where(AuditRule.id == rule_id))
    rule = result.scalar_one_or_none()
    if not rule:
        raise HTTPException(status_code=404, detail="规则不存在")

    update_data = data.model_dump(exclude_unset=True)
    for key, value in update_data.items():
        setattr(rule, key, value)
    await db.commit()
    await db.refresh(rule)
    return rule


@router.delete("/{rule_id}")
async def delete_audit_rule(
    rule_id: int,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(require_role("admin")),
):
    result = await db.execute(select(AuditRule).where(AuditRule.id == rule_id))
    rule = result.scalar_one_or_none()
    if not rule:
        raise HTTPException(status_code=404, detail="规则不存在")

    await db.delete(rule)
    await db.commit()
    return {"message": "规则已删除"}


@router.post("/{rule_id}/toggle", response_model=AuditRuleResponse)
async def toggle_audit_rule(
    rule_id: int,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(require_role("admin", "dba")),
):
    result = await db.execute(select(AuditRule).where(AuditRule.id == rule_id))
    rule = result.scalar_one_or_none()
    if not rule:
        raise HTTPException(status_code=404, detail="规则不存在")

    rule.is_enabled = not rule.is_enabled
    await db.commit()
    await db.refresh(rule)
    return rule


@router.post("/seed-v2", response_model=List[AuditRuleResponse])
async def seed_v2_audit_rules(
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(require_role("admin")),
):
    """批量初始化 SQL 审核引擎 V2 的所有规则种子数据（40+ 条规则）。

    涵盖 DDL/DML/DQL/命名规范/性能/安全等多个维度，
    跳过数据库中已存在的规则（按名称去重）。
    """
    created = await seed_all_rules(db)
    return created