"""
===============================================================================
FILE: modules/web_api/routers/remote_workers.py
ROLE: REST API реестра удаленщиков (CRUD, редактирование сроков, автоочистка).
===============================================================================
"""

import os
from datetime import datetime
import pandas as pd
from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel
from typing import Optional, List, Dict, Any

from routers.auth import get_current_user
from config import BASE_DIR, DATA_DIR

router = APIRouter(prefix="/api/v1/remote-workers", tags=["RemoteWorkers"])
CSV_PATH = os.path.join(DATA_DIR, "static_reason_workers.csv")


def _load_workers() -> List[Dict[str, Any]]:
    """Читает CSV, гарантирует структуру колонок и удаляет просроченные записи."""
    if not os.path.exists(CSV_PATH):
        return []
    try:
        df = pd.read_csv(CSV_PATH, dtype=str, on_bad_lines='skip').fillna("")
        for col in ["fio", "department", "reason", "date_from", "date_to"]:
            if col not in df.columns:
                df[col] = ""

        today_date = datetime.now().date()
        valid_workers = []
        has_expired = False

        for row in df.to_dict(orient="records"):
            fio = str(row.get("fio", "")).strip()
            if not fio:
                continue

            d_to_str = str(row.get("date_to", "")).strip()
            if d_to_str and d_to_str.lower() not in ["nan", "none", ""]:
                try:
                    d_to = datetime.strptime(d_to_str.replace('_', '.'), "%d.%m.%Y").date()
                    # Если срок завершился вчера или ранее — запись удаляется из файла
                    if today_date > d_to:
                        has_expired = True
                        continue
                except ValueError:
                    pass

            valid_workers.append(row)

        # Синхронная перезапись файла при обнаружении истекших сроков
        if has_expired:
            _save_workers(valid_workers)

        return valid_workers
    except Exception:
        return []


def _save_workers(workers: List[Dict[str, Any]]):
    """Сохраняет актуальный список в CSV с сохранением колонок."""
    df = pd.DataFrame(workers)
    for col in ["fio", "department", "reason", "date_from", "date_to"]:
        if col not in df.columns:
            df[col] = ""
    os.makedirs(os.path.dirname(CSV_PATH), exist_ok=True)
    df.to_csv(CSV_PATH, index=False, encoding="utf-8")


class RemoteWorkerItem(BaseModel):
    fio: str
    department: Optional[str] = "Все"
    reason: Optional[str] = "Удаленная работа"
    date_from: Optional[str] = ""
    date_to: Optional[str] = ""


class UpdateDatesRequest(BaseModel):
    fio: str
    date_from: Optional[str] = ""
    date_to: Optional[str] = ""


@router.get("")
def api_get_remote_workers(current_user = Depends(get_current_user)):
    return {"workers": _load_workers()}


@router.post("")
def api_add_remote_worker(item: RemoteWorkerItem, current_user = Depends(get_current_user)):
    workers = _load_workers()
    fio_clean = item.fio.strip()
    if not fio_clean:
        raise HTTPException(status_code=400, detail="ФИО не может быть пустым")

    # Если начало не указано — берем сегодня
    today_str = datetime.now().strftime("%d.%m.%Y")
    date_from = item.date_from.strip() if item.date_from and item.date_from.strip() else today_str
    date_to = item.date_to.strip() if item.date_to else ""

    # Проверка на совпадение ФИО (обновление существующей записи)
    for w in workers:
        if str(w.get("fio", "")).strip().lower() == fio_clean.lower():
            w["department"] = item.department.strip() if item.department else (w.get("department") or "Все")
            w["reason"] = item.reason.strip() if item.reason else (w.get("reason") or "Удаленная работа")
            w["date_from"] = date_from
            w["date_to"] = date_to
            _save_workers(workers)
            return {"status": "success", "message": "Срок удаленки обновлен", "workers": workers}

    workers.append({
        "fio": fio_clean,
        "department": item.department.strip() if item.department else "Все",
        "reason": item.reason.strip() if item.reason else "Удаленная работа",
        "date_from": date_from,
        "date_to": date_to
    })
    _save_workers(workers)
    return {"status": "success", "workers": workers}


@router.put("")
def api_update_worker_dates(req: UpdateDatesRequest, current_user = Depends(get_current_user)):
    """Редактирование срока удаленки (продление или сокращение)."""
    workers = _load_workers()
    target_fio = req.fio.strip().lower()
    found = False

    for w in workers:
        if str(w.get("fio", "")).strip().lower() == target_fio:
            w["date_from"] = req.date_from.strip() if req.date_from is not None else w.get("date_from", "")
            w["date_to"] = req.date_to.strip() if req.date_to is not None else w.get("date_to", "")
            found = True
            break

    if not found:
        raise HTTPException(status_code=404, detail="Сотрудник не найден в списке")

    _save_workers(workers)
    return {"status": "success", "message": "Сроки успешно изменены", "workers": workers}


@router.delete("")
def api_delete_remote_worker(fio: str, current_user = Depends(get_current_user)):
    workers = _load_workers()
    fio_clean = fio.strip().lower()
    initial_len = len(workers)
    workers = [w for w in workers if str(w.get("fio", "")).strip().lower() != fio_clean]

    if len(workers) == initial_len:
        raise HTTPException(status_code=404, detail="Сотрудник не найден")

    _save_workers(workers)
    return {"status": "success", "workers": workers}