# api/ecs.py

from typing import List, Dict
from fastapi import APIRouter, HTTPException, Query
from pydantic import BaseModel, Field

from services.ecs_service import (
    create_ecs_instances,
    get_account_credit,
    list_custom_and_shared_images,
    list_vpcs_and_vswitches,
)
from utils.validators import (
    is_valid_customer_name,
    is_valid_resource_name,
    is_valid_region,
)

router = APIRouter()


class ImageItem(BaseModel):
    ImageId: str = Field(..., description="镜像 ID")
    ImageName: str = Field(..., description="镜像名称")


class CreateInstanceRequest(BaseModel):
    customer: str
    resource_name: str
    region: str
    access_key: str
    secret_key: str
    count: int = 1
    account_uid: str | None = None
    image_id: str
    zone_id: str | None = None
    vswitch_id: str | None = None


class InstanceResponse(BaseModel):
    ip: str
    name: str
    region: str
    instance_id: str
    user: str
    password: str
    created: str
    email: str | None = None
    ram_user: str
    ram_password: str
    image_id: str


class CreateInstancesResponse(BaseModel):
    instances: list[InstanceResponse]


@router.get(
    "/images",
    response_model=List[ImageItem],
    summary="查询自建镜像和共享给您的镜像列表",
)
def get_images(
    access_key: str = Query(..., description="用户的 AccessKey"),
    secret_key: str = Query(..., description="用户的 SecretKey"),
    ecs_region: str = Query("ap-southeast-1", description="ECS 实例所在区域，仅做展示"),
) -> List[ImageItem]:
    """
    返回两类镜像：
      - owner_alias='self'   用户自建镜像
      - owner_alias='others'  共享给用户的镜像
    """
    try:
        images = list_custom_and_shared_images(
            access_key, secret_key, ecs_region)
        return images
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"拉取镜像失败：{e}")


@router.get("/balance")
def balance(
    access_key: str = Query(..., description="用户的 AccessKey"),
    secret_key: str = Query(..., description="用户的 SecretKey"),
    ecs_region: str = Query("ap-southeast-1", description="ECS 实例所在区域，仅做展示"),
) -> Dict[str, float]:
    """
    查询账户可用余额（AvailableAmount），接口名不变仍叫 /balance
    """
    try:
        # 调用 get_account_credit 方法查询可用余额
        available_amount = get_account_credit(
            access_key, secret_key, ecs_region)

        # 返回查询结果，确保返回 float 类型
        return {"available_amount": float(available_amount)}

    except RuntimeError as re:
        # 捕获具体的运行时错误并返回 400 状态码
        raise HTTPException(status_code=400, detail=f"请求失败：{str(re)}")

    except Exception as e:
        # 捕获所有其他异常并返回 500 状态码
        raise HTTPException(status_code=500, detail=f"查询可用余额失败：{str(e)}")


@router.post("/create", response_model=CreateInstancesResponse)
def create_instances(data: CreateInstanceRequest):
    if not is_valid_customer_name(data.customer):
        raise HTTPException(status_code=400, detail="客户名称不能为空")
    if not is_valid_resource_name(data.resource_name):
        raise HTTPException(status_code=400, detail="资源账号名称非法")
    if not is_valid_region(data.region):
        raise HTTPException(status_code=400, detail="区域 ID 格式不合法")

    try:
        results = create_ecs_instances(
            customer=data.customer,
            resource_name=data.resource_name,
            region=data.region,
            access_key=data.access_key,
            secret_key=data.secret_key,
            count=data.count,
            account_uid=data.account_uid,
            image_id=data.image_id,
            zone_id=data.zone_id,
            vswitch_id=data.vswitch_id,
        )
        return CreateInstancesResponse(instances=results)
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/vswitches")
def list_vswitches(
    access_key: str = Query(..., description="AccessKey"),
    secret_key: str = Query(..., description="SecretKey"),
    ecs_region: str = Query(..., description="地域 ID"),
):
    """
    拉取指定地域下的 VPC 与 VSwitch 列表，供前端选择。
    """
    try:
        data = list_vpcs_and_vswitches(access_key, secret_key, ecs_region)
        return data
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"拉取 VPC/VSwitch 失败：{e}")