"""OLT 设备管理 API"""
from fastapi import APIRouter, Depends, HTTPException, UploadFile, File
from sqlalchemy.orm import Session
from sqlalchemy import distinct
from pydantic import BaseModel
from app.core.database import get_db
from app.core.config import settings
from app.middleware.permission_middleware import require_permission
from app.models.device import OLTDevice
import pandas as pd
import io

router = APIRouter(prefix="/api/olt", tags=["OLT设备"])


class OLTCreate(BaseModel):
    ip_address: str
    username: str
    password: str
    slot_command: str = "display onu slot"
    region: str = "城区"
    location: str = ""
    description: str = ""


class OLTEdit(BaseModel):
    username: str
    password: str = None
    slot_command: str = "display onu slot"
    region: str = "城区"
    location: str = ""
    description: str = ""


@router.get("/regions")
def get_olt_regions(
    db: Session = Depends(get_db),
    current: dict = Depends(require_permission('olt.view')),
):
    """获取 OLT 设备的所有区域（受角色数据范围限制）"""
    query = db.query(distinct(OLTDevice.region)).filter(
        OLTDevice.region.isnot(None),
        OLTDevice.region != ''
    )
    if current.get('role') == 'area_admin' and current.get('assigned_area'):
        areas = [a.strip() for a in current['assigned_area'].split(',') if a.strip()]
        if areas:
            query = query.filter(OLTDevice.region.in_(areas))
        else:
            return []
    return sorted([r[0] for r in query.all()])


@router.get("/devices")
def get_devices(
    db: Session = Depends(get_db),
    current: dict = Depends(require_permission('olt.view')),
):
    q = db.query(OLTDevice)
    # 区域管理员只能看自己区域的 OLT
    if current.get('role') == 'area_admin' and current.get('assigned_area'):
        areas = [a.strip() for a in current['assigned_area'].split(',') if a.strip()]
        if areas:
            q = q.filter(OLTDevice.region.in_(areas))
        else:
            return []
    return q.all()


@router.post("/devices")
def create_device(
    device: OLTCreate,
    db: Session = Depends(get_db),
    current: dict = Depends(require_permission('olt.manage')),
):
    # 区域管理员只能创建自己区域的 OLT
    if current.get('role') == 'area_admin' and current.get('assigned_area'):
        areas = [a.strip() for a in current['assigned_area'].split(',') if a.strip()]
        if device.region not in areas:
            raise HTTPException(status_code=403, detail="只能管理本区域的 OLT")
    db_device = OLTDevice(**device.dict())
    db.add(db_device)
    db.commit()
    return {"message": "创建成功"}


@router.put("/devices/{ip_address}")
def update_device(
    ip_address: str,
    device: OLTEdit,
    db: Session = Depends(get_db),
    current: dict = Depends(require_permission('olt.manage')),
):
    db_device = db.query(OLTDevice).filter(OLTDevice.ip_address == ip_address).first()
    if not db_device:
        raise HTTPException(status_code=404, detail="设备不存在")
    # 区域管理员只能管理自己区域的 OLT
    if current.get('role') == 'area_admin' and current.get('assigned_area'):
        areas = [a.strip() for a in current['assigned_area'].split(',') if a.strip()]
        if db_device.region not in areas:
            raise HTTPException(status_code=403, detail="只能管理本区域的 OLT")

    db_device.username = device.username
    if device.password:
        db_device.password = device.password
    db_device.slot_command = device.slot_command
    db_device.region = device.region
    db_device.location = device.location
    db_device.description = device.description

    db.commit()
    return {"message": "更新成功"}


@router.delete("/devices/{ip_address}")
def delete_device(
    ip_address: str,
    db: Session = Depends(get_db),
    current: dict = Depends(require_permission('olt.manage')),
):
    from app.models.device import ONUDevice

    device = db.query(OLTDevice).filter(OLTDevice.ip_address == ip_address).first()
    if not device:
        raise HTTPException(status_code=404, detail="设备不存在")
    if current.get('role') == 'area_admin' and current.get('assigned_area'):
        areas = [a.strip() for a in current['assigned_area'].split(',') if a.strip()]
        if device.region not in areas:
            raise HTTPException(status_code=403, detail="只能管理本区域的 OLT")

    onu_count = db.query(ONUDevice).filter(ONUDevice.olt_id == device.id).count()
    if onu_count > 0:
        raise HTTPException(status_code=400, detail=f"该 OLT 设备下还有 {onu_count} 个 ONU 设备，无法删除")

    db.delete(device)
    db.commit()
    return {"message": "删除成功"}


@router.post("/import")
async def import_devices(
    file: UploadFile = File(...),
    db: Session = Depends(get_db),
    _: dict = Depends(require_permission('olt.manage')),
):
    try:
        content = await file.read()
        df = pd.read_excel(io.BytesIO(content))
        # 标准化列名
        df.columns = [str(c).strip() for c in df.columns]
    except Exception as e:
        raise HTTPException(status_code=400, detail=f"文件解析失败: {str(e)}")

    required_cols = ['IP地址', '用户名', '密码']
    missing = [c for c in required_cols if c not in df.columns]
    if missing:
        raise HTTPException(status_code=400, detail=f"缺少必填列: {', '.join(missing)}，当前列: {', '.join(df.columns.tolist())}")

    success, failed = 0, []
    for idx, row in df.iterrows():
        try:
            ip = str(row['IP地址']).strip()
            if not ip or ip == 'nan':
                continue
            existing = db.query(OLTDevice).filter(OLTDevice.ip_address == ip).first()
            if existing:
                failed.append({"row": idx + 2, "ip": ip, "reason": "IP 已存在"})
                continue
            device = OLTDevice(
                ip_address=ip,
                username=str(row['用户名']).strip(),
                password=str(row['密码']).strip(),
                slot_command=str(row['槽位命令']).strip() if '槽位命令' in df.columns and str(row['槽位命令']) != 'nan' else 'display onu slot',
                region=str(row['区域']).strip() if '区域' in df.columns and str(row['区域']) != 'nan' else '城区',
                location=str(row['安装位置']).strip() if '安装位置' in df.columns and str(row['安装位置']) != 'nan' else '',
                description=str(row['描述']).strip() if '描述' in df.columns and str(row['描述']) != 'nan' else '',
            )
            db.add(device)
            success += 1
        except Exception as e:
            failed.append({"row": idx + 2, "ip": str(row.get('IP地址', '')), "reason": str(e)})

    db.commit()
    return {"message": f"成功导入 {success} 条记录", "success": success, "failed": failed}


@router.get("/template")
def download_template():
    from fastapi.responses import FileResponse
    import os
    # __file__ is at <root>/app/api/v1/olt.py → go up 4 levels to reach <root>
    base = os.path.dirname(os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__)))))
    path = os.path.join(base, "templates", "OLT设备导入模板.xlsx")
    return FileResponse(path=path, filename="OLT设备导入模板.xlsx")


@router.get("/duplicate-macs")
def get_duplicate_macs(
    olt_id: int = None,
    db: Session = Depends(get_db),
    _: dict = Depends(require_permission('olt.view')),
):
    """查询重复 MAC 地址记录"""
    from app.models.device import DuplicateMac
    query = db.query(DuplicateMac)
    if olt_id:
        query = query.filter(DuplicateMac.olt_id == olt_id)
    records = query.order_by(DuplicateMac.last_seen_at.desc()).all()
    return [
        {
            "id": r.id,
            "olt_id": r.olt_id,
            "mac_address": r.mac_address,
            "ports": r.ports,
            "first_seen_at": r.first_seen_at,
            "last_seen_at": r.last_seen_at,
        }
        for r in records
    ]


@router.delete("/duplicate-macs/{record_id}")
def delete_duplicate_mac(
    record_id: int,
    db: Session = Depends(get_db),
    _: dict = Depends(require_permission('olt.manage')),
):
    """删除重复 MAC 记录（已处理后清除）"""
    from app.models.device import DuplicateMac
    record = db.query(DuplicateMac).filter(DuplicateMac.id == record_id).first()
    if not record:
        raise HTTPException(status_code=404, detail="记录不存在")
    db.delete(record)
    db.commit()
    return {"message": "已删除"}


class ClearPortRequest(BaseModel):
    port_id: str  # 如 "1/0/1:3"


@router.post("/duplicate-macs/{record_id}/clear-port")
def clear_onu_port(
    record_id: int,
    body: ClearPortRequest,
    db: Session = Depends(get_db),
    _: dict = Depends(require_permission('olt.manage')),
):
    """通过 SSH 清除指定端口的 ONU 配置，并从 ports 列表中移除该端口"""
    from app.models.device import DuplicateMac
    from app.services.ssh_service import SSHService

    record = db.query(DuplicateMac).filter(DuplicateMac.id == record_id).first()
    if not record:
        raise HTTPException(status_code=404, detail="记录不存在")

    olt = db.query(OLTDevice).filter(OLTDevice.id == record.olt_id).first()
    if not olt:
        raise HTTPException(status_code=404, detail="OLT 设备不存在")

    # 验证 port_id 在记录中
    port_ids = [p["port_id"] for p in (record.ports or [])]
    if body.port_id not in port_ids:
        raise HTTPException(status_code=400, detail="端口不在重复记录中")

    try:
        with SSHService(olt.ip_address, olt.username, olt.password) as ssh:
            ssh.clear_onu_port(body.port_id)
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"清除失败: {str(e)}")

    # 从 ports 列表移除已清除的端口
    remaining = [p for p in record.ports if p["port_id"] != body.port_id]
    if remaining:
        record.ports = remaining
    else:
        # 所有端口都清除了，删除整条记录
        db.delete(record)
    db.commit()

    return {"message": f"端口 Onu{body.port_id} 已清除", "remaining_ports": remaining}


@router.get("/new-devices")
def get_new_devices(
    db: Session = Depends(get_db),
    _: dict = Depends(require_permission('olt.view')),
):
    """查询新发现的设备列表（待补全信息）"""
    from app.models.device import NewDevice, ONUDevice
    rows = (
        db.query(NewDevice, ONUDevice)
        .join(ONUDevice, NewDevice.onu_device_id == ONUDevice.id)
        .all()
    )
    return [
        {
            "id": nd.id,
            "onu_device_id": nd.onu_device_id,
            "olt_id": nd.olt_id,
            "discovered_at": nd.discovered_at,
            "mac_address": onu.mac_address,
            "port_id": f"{onu.slot_number}/{onu.port_number}" if onu.slot_number else None,
            "loid": onu.loid,
            "model": onu.model,
            "region": onu.region,
            "school_name": onu.school_name,
            "building": onu.building,
            "room_number": onu.room_number,
        }
        for nd, onu in rows
    ]


class NewDeviceUpdate(BaseModel):
    region: str
    school_name: str
    building: str = ""
    place_type: str = ""
    room_number: str = ""
    notes: str = ""


@router.put("/new-devices/{record_id}")
def update_new_device(
    record_id: int,
    body: NewDeviceUpdate,
    db: Session = Depends(get_db),
    _: dict = Depends(require_permission('olt.manage')),
):
    """补全新设备信息，完成后从 new_devices 移除"""
    from app.models.device import NewDevice, ONUDevice
    record = db.query(NewDevice).filter(NewDevice.id == record_id).first()
    if not record:
        raise HTTPException(status_code=404, detail="记录不存在")

    onu = db.query(ONUDevice).filter(ONUDevice.id == record.onu_device_id).first()
    if not onu:
        raise HTTPException(status_code=404, detail="ONU 设备不存在")

    onu.region = body.region
    onu.school_name = body.school_name
    onu.building = body.building or None
    onu.place_type = body.place_type or None
    onu.room_number = body.room_number or None
    onu.notes = body.notes or None

    db.delete(record)
    db.commit()
    return {"message": "信息已补全"}


@router.delete("/new-devices/{record_id}")
def dismiss_new_device(
    record_id: int,
    db: Session = Depends(get_db),
    _: dict = Depends(require_permission('olt.manage')),
):
    """忽略新设备（不补全信息，仅从待处理列表移除）"""
    from app.models.device import NewDevice
    record = db.query(NewDevice).filter(NewDevice.id == record_id).first()
    if not record:
        raise HTTPException(status_code=404, detail="记录不存在")
    db.delete(record)
    db.commit()
    return {"message": "已忽略"}


@router.post("/quick-scan")
def quick_scan(
    db: Session = Depends(get_db),
    _: dict = Depends(require_permission('olt.discover')),
):
    """多线程对所有 OLT 同时执行扫描，更新已有设备状态"""
    from app.services.check_service import CheckService
    from concurrent.futures import ThreadPoolExecutor, as_completed

    olts = db.query(OLTDevice).all()

    def scan_one(olt):
        from app.core.database import SessionLocal
        thread_db = SessionLocal()
        try:
            service = CheckService(thread_db)
            result = service.scan_and_discover(olt.id)
            return {"olt_id": olt.id, "olt_location": olt.location or olt.ip_address,
                    "online": result.get("online", 0), "offline": result.get("offline", 0),
                    "new_discovered": result.get("new_discovered", 0),
                    "error": None}
        except Exception as e:
            return {"olt_id": olt.id, "olt_location": olt.location or olt.ip_address,
                    "online": 0, "offline": 0, "new_discovered": 0, "error": str(e)}
        finally:
            thread_db.close()

    olt_results = {}
    with ThreadPoolExecutor(max_workers=len(olts) or 1) as executor:
        futures = {executor.submit(scan_one, olt): olt.id for olt in olts}
        for future in as_completed(futures):
            r = future.result()
            olt_results[r["olt_id"]] = r

    results = []
    errors = []
    total_online = 0
    total_offline = 0
    total_new = 0
    for olt in olts:
        r = olt_results.get(olt.id, {})
        if r.get("error"):
            errors.append({"olt_location": r["olt_location"], "error": r["error"]})
        else:
            total_online += r.get("online", 0)
            total_offline += r.get("offline", 0)
            total_new += r.get("new_discovered", 0)
        results.append({
            "olt_location": r.get("olt_location", olt.location or olt.ip_address),
            "online": r.get("online", 0),
            "offline": r.get("offline", 0),
            "new_discovered": r.get("new_discovered", 0),
            "success": not r.get("error"),
            "error": r.get("error"),
        })

    return {
        "total_online": total_online,
        "total_offline": total_offline,
        "total_new": total_new,
        "results": results,
        "errors": errors,
    }


@router.post("/loopback-detection")
def loopback_detection(
    db: Session = Depends(get_db),
    _: dict = Depends(require_permission('olt.loopback')),
):
    """对所有 OLT 并发执行环路检测，返回有环路的端口及对应设备信息"""
    from app.models.device import ONUDevice
    from app.services.ssh_service import SSHService
    from concurrent.futures import ThreadPoolExecutor, as_completed

    olts = db.query(OLTDevice).all()

    # 预加载所有 ONU 设备，按 (olt_id, port_id) 索引，避免多线程操作 Session
    all_onus = db.query(ONUDevice).all()
    onu_map = {(o.olt_id, o.port_id): o for o in all_onus if o.port_id}

    def check_one(olt):
        try:
            with SSHService(olt.ip_address, olt.username, olt.password) as ssh:
                detection = ssh.detect_loopback()
        except Exception as e:
            return {
                "olt_id": olt.id,
                "olt_ip": olt.ip_address,
                "olt_location": olt.location or olt.ip_address,
                "error": str(e),
                "has_loop": False,
                "loop_interfaces": [],
            }

        loop_interfaces = []
        for iface in detection.get("interfaces", []):
            port_id = iface.removeprefix("Onu")
            onu = onu_map.get((olt.id, port_id))
            loop_interfaces.append({
                "interface": iface,
                "port_id": port_id,
                "mac_address": onu.mac_address if onu else None,
                "region": onu.region if onu else None,
                "school_name": onu.school_name if onu else None,
                "building": onu.building if onu else None,
                "room_number": onu.room_number if onu else None,
            })

        return {
            "olt_id": olt.id,
            "olt_ip": olt.ip_address,
            "olt_location": olt.location or olt.ip_address,
            "has_loop": detection["has_loop"],
            "loop_interfaces": loop_interfaces,
            "error": None,
            "raw": detection.get("raw", ""),
        }

    results_map = {}
    with ThreadPoolExecutor(max_workers=len(olts) or 1) as executor:
        futures = {executor.submit(check_one, olt): olt.id for olt in olts}
        for future in as_completed(futures):
            olt_id = futures[future]
            results_map[olt_id] = future.result()

    # 按原始顺序返回
    return [results_map[olt.id] for olt in olts]


class SyncNTPRequest(BaseModel):
    old_server: str = settings.NTP_OLD_SERVER
    new_server: str = settings.NTP_NEW_SERVER


@router.post("/sync-ntp")
def sync_ntp(
    body: SyncNTPRequest,
    db: Session = Depends(get_db),
    current: dict = Depends(require_permission('olt.manage')),
):
    """对所有 OLT 并发执行 NTP 时间服务器同步"""
    from app.services.ssh_service import SSHService
    from concurrent.futures import ThreadPoolExecutor, as_completed

    olts = db.query(OLTDevice).all()
    if current.get('role') == 'area_admin' and current.get('assigned_area'):
        areas = [a.strip() for a in current['assigned_area'].split(',') if a.strip()]
        olts = [o for o in olts if o.region in areas] if areas else []

    def sync_one(olt):
        try:
            with SSHService(olt.ip_address, olt.username, olt.password) as ssh:
                ssh.sync_ntp(body.old_server, body.new_server)
            return {
                "olt_ip": olt.ip_address,
                "olt_location": olt.location or olt.ip_address,
                "success": True,
                "error": None,
            }
        except Exception as e:
            return {
                "olt_ip": olt.ip_address,
                "olt_location": olt.location or olt.ip_address,
                "success": False,
                "error": str(e),
            }

    results_map = {}
    with ThreadPoolExecutor(max_workers=len(olts) or 1) as executor:
        futures = {executor.submit(sync_one, olt): olt.id for olt in olts}
        for future in as_completed(futures):
            r = future.result()
            results_map[r["olt_ip"]] = r

    results = [results_map[olt.ip_address] for olt in olts]
    success_count = sum(1 for r in results if r["success"])
    return {
        "total": len(results),
        "success": success_count,
        "failed": len(results) - success_count,
        "results": results,
    }


class TogglePortRequest(BaseModel):
    action: str  # "shutdown" 或 "undo shutdown"


@router.get("/devices/{olt_id}/ports")
def get_olt_ports(
    olt_id: int,
    db: Session = Depends(get_db),
    _: dict = Depends(require_permission('olt.port_manage')),
):
    """获取指定 OLT 的所有 Olt 端口状态"""
    from app.services.ssh_service import SSHService
    olt = db.query(OLTDevice).filter(OLTDevice.id == olt_id).first()
    if not olt:
        raise HTTPException(status_code=404, detail="OLT 不存在")
    try:
        with SSHService(olt.ip_address, olt.username, olt.password) as ssh:
            ports = ssh.get_olt_ports()
        return {"ports": ports}
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/devices/{olt_id}/ports/toggle")
def toggle_olt_port(olt_id: int, body: TogglePortRequest, port_name: str, db: Session = Depends(get_db), _: dict = Depends(require_permission('olt.port_manage'))):
    """开启或关闭指定 OLT 端口"""
    from app.services.ssh_service import SSHService
    if body.action not in ("shutdown", "undo shutdown"):
        raise HTTPException(status_code=400, detail="action 必须为 shutdown 或 undo shutdown")
    olt = db.query(OLTDevice).filter(OLTDevice.id == olt_id).first()
    if not olt:
        raise HTTPException(status_code=404, detail="OLT 不存在")
    try:
        with SSHService(olt.ip_address, olt.username, olt.password) as ssh:
            ssh.toggle_olt_port(port_name, body.action)
        return {"message": f"端口 {port_name} 已{'关闭' if body.action == 'shutdown' else '开启'}"}
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))