"""存储池管理路由"""
from fastapi import APIRouter, HTTPException, Query
from pydantic import BaseModel, Field
from typing import Optional
from lxml import etree
import os

from app.libvirt_conn import conn_pool
import libvirt

router = APIRouter()


class PoolCreate(BaseModel):
    name: str = Field(..., description="存储池名称")
    path: str = Field(..., description="存储池路径")
    type: str = Field("dir", description="存储池类型: dir/fs/logical")


class VolCreate(BaseModel):
    name: str = Field(..., description="卷名称")
    capacity_gb: int = Field(20, description="容量(GB)")
    format: str = Field("qcow2", description="格式: qcow2/raw")


@router.get("/pools")
async def list_pools(host_id: str = Query("local")):
    """列出所有存储池"""
    conn = conn_pool.get_conn(host_id)
    pools = conn.listAllStoragePools(0)
    result = []
    for pool in pools:
        info = pool.info()
        xml = etree.fromstring(pool.XMLDesc(0).encode())
        target = xml.find(".//target/path")
        result.append({
            "name": pool.name(),
            "state": ["inactive", "building", "running", "degraded", "inaccessible"][info[0]] if info[0] < 5 else "unknown",
            "capacity_gb": round(info[1] / (1024**3), 2),
            "allocation_gb": round(info[2] / (1024**3), 2),
            "available_gb": round(info[3] / (1024**3), 2),
            "path": target.text if target is not None else "",
            "autostart": pool.autostart() == 1,
            "persistent": pool.isPersistent() == 1,
        })
    return {"pools": result, "total": len(result)}


@router.get("/pool/{name}")
async def get_pool(name: str, host_id: str = Query("local")):
    """获取存储池详情"""
    conn = conn_pool.get_conn(host_id)
    try:
        pool = conn.storagePoolLookupByName(name)
    except libvirt.libvirtError:
        raise HTTPException(status_code=404, detail=f"存储池 '{name}' 不存在")

    info = pool.info()
    xml = etree.fromstring(pool.XMLDesc(0).encode())

    volumes = []
    try:
        for vol_name in pool.listVolumes():
            vol = pool.storageVolLookupByName(vol_name)
            vol_info = vol.info()
            volumes.append({
                "name": vol_name,
                "path": vol.path(),
                "type": vol_info[0],
                "capacity_gb": round(vol_info[1] / (1024**3), 2),
                "allocation_gb": round(vol_info[2] / (1024**3), 2),
            })
    except Exception:
        pass

    target = xml.find(".//target/path")
    return {
        "name": pool.name(),
        "state": ["inactive", "building", "running", "degraded", "inaccessible"][info[0]] if info[0] < 5 else "unknown",
        "capacity_gb": round(info[1] / (1024**3), 2),
        "allocation_gb": round(info[2] / (1024**3), 2),
        "available_gb": round(info[3] / (1024**3), 2),
        "path": target.text if target is not None else "",
        "autostart": pool.autostart() == 1,
        "volumes": volumes,
        "volume_count": len(volumes),
    }


@router.post("/pool/create")
async def create_pool(pool: PoolCreate, host_id: str = Query("local")):
    """创建存储池"""
    with conn_pool.get_rw(host_id) as rw_conn:
        xml = f"""<pool type='{pool.type}'>
  <name>{pool.name}</name>
  <target>
    <path>{pool.path}</path>
  </target>
</pool>"""
        try:
            os.makedirs(pool.path, exist_ok=True)
            p = rw_conn.storagePoolDefineXML(xml, 0)
            p.setAutostart(1)
            p.create(0)
            return {"message": f"存储池 '{pool.name}' 创建成功"}
        except libvirt.libvirtError as e:
            raise HTTPException(status_code=500, detail=f"创建存储池失败: {str(e)}")


@router.delete("/pool/{name}")
async def delete_pool(name: str, host_id: str = Query("local")):
    """删除存储池"""
    with conn_pool.get_rw(host_id) as rw_conn:
        try:
            pool = rw_conn.storagePoolLookupByName(name)
        except libvirt.libvirtError:
            raise HTTPException(status_code=404, detail=f"存储池 '{name}' 不存在")

        if pool.info()[0] == libvirt.VIR_STORAGE_POOL_RUNNING:
            pool.destroy()

        pool.undefine()
        return {"message": f"存储池 '{name}' 已删除"}


@router.post("/pool/{name}/volume")
async def create_volume(name: str, vol: VolCreate, host_id: str = Query("local")):
    """在存储池中创建卷"""
    with conn_pool.get_rw(host_id) as rw_conn:
        try:
            pool = rw_conn.storagePoolLookupByName(name)
        except libvirt.libvirtError:
            raise HTTPException(status_code=404, detail=f"存储池 '{name}' 不存在")

        vol_xml = f"""<volume>
  <name>{vol.name}</name>
  <capacity unit='GiB'>{vol.capacity_gb}</capacity>
  <allocation unit='GiB'>1</allocation>
  <target>
    <format type='{vol.format}'/>
  </target>
</volume>"""
        try:
            pool.createXML(vol_xml, 0)
            return {"message": f"卷 '{vol.name}' 创建成功"}
        except libvirt.libvirtError as e:
            raise HTTPException(status_code=500, detail=f"创建卷失败: {str(e)}")


@router.delete("/pool/{pool_name}/volume/{vol_name}")
async def delete_volume(pool_name: str, vol_name: str, host_id: str = Query("local")):
    """删除卷"""
    with conn_pool.get_rw(host_id) as rw_conn:
        try:
            pool = rw_conn.storagePoolLookupByName(pool_name)
            vol = pool.storageVolLookupByName(vol_name)
            vol.delete(0)
            return {"message": f"卷 '{vol_name}' 已删除"}
        except libvirt.libvirtError as e:
            raise HTTPException(status_code=500, detail=f"删除卷失败: {str(e)}")


@router.get("/isos")
async def list_isos(host_id: str = Query("local")):
    """列出可用的ISO镜像"""
    iso_dirs = ["/var/lib/libvirt/iso", "/isos", "/mnt/isos"]
    isos = []
    for d in iso_dirs:
        if os.path.isdir(d):
            for f in os.listdir(d):
                if f.lower().endswith(".iso"):
                    fp = os.path.join(d, f)
                    size = os.path.getsize(fp)
                    isos.append({
                        "name": f,
                        "path": fp,
                        "size_gb": round(size / (1024**3), 2),
                    })
    return {"isos": isos, "total": len(isos)}