import React from "react";
import { assignDriverToOrderGroup, fetchOrderGroups, saveShipmentData, updateDeliveryStatus, updateOrderGroupDeliveryChoice } from "../services/supabase/orderGroupRepository";
import {
  buildOrderGroupBuckets,
  filterOrderGroups,
  groupOrderGroupsByDate,
  ORDER_GROUP_DISPLAY_STATUS_OPTIONS,
  getOrderGroupDisplayStatusValue,
} from "../services/orderGroupViews";
import { getErrorMessage } from "../utils/deliveryUtils";

export const useOrderGroups = () => {
  const [orderGroups, setOrderGroups] = React.useState(() => []);
  const [filters, setFilters] = React.useState({
    query: "",
    displayStatus: "all",
    deliveryType: "",
  });
  const [selectedOrderGroupId, setSelectedOrderGroupId] = React.useState(null);
  const [isLoading, setIsLoading] = React.useState(true);
  const [loadError, setLoadError] = React.useState("");
  const [isSavingDeliveryChoice, setIsSavingDeliveryChoice] = React.useState(false);
  const [isSavingDriverAssignment, setIsSavingDriverAssignment] = React.useState(false);
  const [isSavingStatusChange, setIsSavingStatusChange] = React.useState(false);

  const loadLiveData = React.useCallback(async (showLoading = true) => {
    if (showLoading) {
      setIsLoading(true);
    }
    setLoadError("");

    const groupsResult = await fetchOrderGroups();

    if (!groupsResult) {
      return;
    }

    if (groupsResult.error) {
      setLoadError(groupsResult.error?.message || "Не удалось загрузить группы доставки");
      setOrderGroups([]);
      setIsLoading(false);
      return;
    }

    setOrderGroups(groupsResult.data || []);
    setIsLoading(false);
  }, []);

  // Initial load
  React.useEffect(() => {
    let cancelled = false;
    const doLoad = async () => {
      setIsLoading(true);
      await loadLiveData(true);
      if (cancelled) return;
    };
    doLoad();
    return () => { cancelled = true; };
  }, [loadLiveData]);

  // Refetch on window focus to keep data fresh across tabs/pages
  React.useEffect(() => {
    const handleFocus = () => {
      loadLiveData(false); // silent refetch, no loading spinner
    };
    window.addEventListener("focus", handleFocus);
    return () => window.removeEventListener("focus", handleFocus);
  }, [loadLiveData]);

  React.useEffect(() => {
    if (!orderGroups.length) {
      setSelectedOrderGroupId(null);
      return;
    }

    if (!selectedOrderGroupId || !orderGroups.some((group) => group.id === selectedOrderGroupId)) {
      setSelectedOrderGroupId(orderGroups[0].id);
    }
  }, [orderGroups, selectedOrderGroupId]);

  const statusCounts = React.useMemo(() => {
    const counts = {};
    orderGroups.forEach((group) => {
      const status = getOrderGroupDisplayStatusValue(group);
      counts[status] = (counts[status] || 0) + 1;
    });
    return counts;
  }, [orderGroups]);

  const statusOptions = React.useMemo(() =>
    ORDER_GROUP_DISPLAY_STATUS_OPTIONS.map((opt) => ({
      ...opt,
      count: opt.value === "all" ? orderGroups.length : (statusCounts[opt.value] || 0),
    })),
    [statusCounts, orderGroups]
  );

  const filteredOrderGroups = React.useMemo(
    () => filterOrderGroups(orderGroups, filters),
    [filters, orderGroups],
  );

  const visibleOrderGroups = filteredOrderGroups;
  const selectedOrderGroup =
    visibleOrderGroups.find((group) => group.id === selectedOrderGroupId) ||
    orderGroups.find((group) => group.id === selectedOrderGroupId) ||
    visibleOrderGroups[0] ||
    null;

  const orderGroupsByDate = React.useMemo(() => groupOrderGroupsByDate(orderGroups), [orderGroups]);
  const deliveryGroupBuckets = React.useMemo(() => buildOrderGroupBuckets(orderGroups), [orderGroups]);

  const saveManualDeliveryChoice = React.useCallback(async ({
    orderGroupId,
    deliveryDate,
    deliveryTime,
    deliveryType,
    deliveryAddress,
    pickupDate,
    pickupTimeSlot,
  }) => {
    setIsSavingDeliveryChoice(true);

    try {
      /* Demo mode removed */

      const result = await updateOrderGroupDeliveryChoice({
        orderGroupId,
        deliveryDate,
        deliveryTime,
        deliveryType,
        deliveryAddress,
        pickupDate,
        pickupTimeSlot,
      });

      if (result.error) {
        return {
          success: false,
          error: getErrorMessage(result.error, "Не удалось сохранить согласование доставки"),
        };
      }

      setOrderGroups((currentGroups) =>
        currentGroups.map((group) => (group.id === orderGroupId ? result.data : group)),
      );
      return { success: true, data: result.data };
    } catch (error) {
      return {
        success: false,
        error: getErrorMessage(error, "Не удалось сохранить согласование доставки"),
      };
    } finally {
      setIsSavingDeliveryChoice(false);
    }
  }, []);

  const assignDriver = React.useCallback(async ({ orderGroupId, driverId }) => {
    setIsSavingDriverAssignment(true);

    try {
      const result = await assignDriverToOrderGroup({ orderGroupId, driverId });


      if (result.error) {
        return {
          success: false,
          error: getErrorMessage(result.error, "Не удалось назначить водителя"),
        };
      }

      setOrderGroups((currentGroups) =>
        currentGroups.map((group) => (group.id === orderGroupId ? result.data : group)),
      );
      return { success: true, data: result.data };
    } catch (error) {
      return {
        success: false,
        error: getErrorMessage(error, "Не удалось назначить водителя"),
      };
    } finally {
      setIsSavingDriverAssignment(false);
    }
  }, []);

  const changeDeliveryStatus = React.useCallback(async ({ orderGroupId, status, details, shipmentData }) => {
    setIsSavingStatusChange(true);
    try {
      const result = await updateDeliveryStatus({ orderGroupId, status, details, shipmentData });
      if (result.error) {
        return {
          success: false,
          error: getErrorMessage(result.error, "Не удалось обновить статус"),
        };
      }
      setOrderGroups((currentGroups) =>
        currentGroups.map((group) => (group.id === orderGroupId ? result.data : group)),
      );
      return { success: true, data: result.data };
    } catch (error) {
      return {
        success: false,
        error: getErrorMessage(error, "Не удалось обновить статус"),
      };
    } finally {
      setIsSavingStatusChange(false);
    }
  }, []);

  const onSaveShipmentData = React.useCallback(async ({ orderGroupId, shipmentData }) => {
    try {
      const result = await saveShipmentData({ orderGroupId, shipmentData });
      if (result.error) {
        return {
          success: false,
          error: getErrorMessage(result.error, "Не удалось сохранить данные отгрузки"),
        };
      }
      setOrderGroups((currentGroups) =>
        currentGroups.map((group) => (group.id === orderGroupId ? result.data : group)),
      );
      return { success: true, data: result.data };
    } catch (error) {
      return {
        success: false,
        error: getErrorMessage(error, "Не удалось сохранить данные отгрузки"),
      };
    }
  }, []);

  return {
    orderGroups,
    allOrderGroups: orderGroups,
    filteredOrderGroups,
    visibleOrderGroups,
    selectedOrderGroup,
    selectedOrderGroupId,
    setSelectedOrderGroupId,
    filters,
    setFilters,
    statusOptions,
    orderGroupsByDate,
    deliveryGroupBuckets,
    saveManualDeliveryChoice,
    assignDriver,
    changeDeliveryStatus,
    saveShipmentData: onSaveShipmentData,
    isSavingDeliveryChoice,
    isSavingDriverAssignment,
    isSavingStatusChange,
    isLoading,
    loadError,
    refetch: loadLiveData,
  };
};