"""数据字典 API 端点。"""
from typing import Optional

from fastapi import APIRouter, Depends, HTTPException, Query
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.services import dictionary_service

router = APIRouter(tags=["数据字典"])


@router.get("/instances/{instance_id}/databases")
async def list_databases(
    instance_id: int,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(require_role("admin", "dba", "developer")),
):
    """获取实例的数据库列表。"""
    databases = await dictionary_service.list_databases(db, instance_id)
    if databases is None:
        raise HTTPException(status_code=404, detail="数据源不存在")
    return {"databases": databases}


@router.get("/instances/{instance_id}/tables")
async def list_tables(
    instance_id: int,
    database: str = Query(..., description="数据库名"),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(require_role("admin", "dba", "developer")),
):
    """获取指定数据库的表列表。"""
    tables = await dictionary_service.list_tables(db, instance_id, database)
    if tables is None:
        raise HTTPException(status_code=404, detail="数据源不存在")
    return {"tables": tables}


@router.get("/instances/{instance_id}/tables/{table_name}")
async def get_table_detail(
    instance_id: int,
    table_name: str,
    database: str = Query(..., description="数据库名"),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(require_role("admin", "dba", "developer")),
):
    """获取表详情: 字段/索引/DDL/行数。"""
    detail = await dictionary_service.get_table_detail(
        db, instance_id, database, table_name
    )
    if not detail:
        raise HTTPException(status_code=404, detail="数据源不存在")
    return detail


@router.get("/instances/{instance_id}/export")
async def export_dictionary(
    instance_id: int,
    database: str = Query(..., description="数据库名"),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(require_role("admin", "dba", "developer")),
):
    """导出整个数据库的表结构信息。"""
    result = await dictionary_service.export_dictionary(
        db, instance_id, database
    )
    return {"tables": result}