import { create } from 'zustand';
import { deliveriesApi } from '../api';
import { useToastStore } from './toastStore';
import type { Delivery, DeliveryStatus } from '../types';

interface DeliveryState {
  // Data
  deliveries: Delivery[];
  deliveryCounts: Record<string, number>;

  // Loading states
  isLoading: boolean;
  isLoadingCounts: boolean;
  error: string | null;

  // Actions
  fetchDeliveriesByDate: (date: string) => Promise<void>;
  fetchDeliveryCounts: () => Promise<void>;
  addDelivery: (delivery: Omit<Delivery, 'id' | 'createdAt' | 'updatedAt'>) => Promise<void>;
  updateDelivery: (id: string, updates: Omit<Delivery, 'id' | 'createdAt' | 'updatedAt'>) => Promise<void>;
  deleteDelivery: (id: string) => Promise<void>;
  toggleStatus: (id: string, currentStatus: DeliveryStatus) => Promise<void>;
  getDeliveriesByDate: (date: string) => Delivery[];
  getDeliveriesByDateRange: (startDate: string, endDate: string) => Delivery[];
  getDeliveryCountsByDate: () => Record<string, number>;
  clearError: () => void;
}

export const useDeliveryStore = create<DeliveryState>()((set, get) => ({
  // Initial state
  deliveries: [],
  deliveryCounts: {},
  isLoading: false,
  isLoadingCounts: false,
  error: null,

  // Fetch deliveries for a specific date
  fetchDeliveriesByDate: async (date: string) => {
    set({ isLoading: true, error: null });
    try {
      const deliveries = await deliveriesApi.getByDate(date);
      set({ deliveries, isLoading: false });
    } catch (err) {
      const message = err instanceof Error ? err.message : 'Failed to fetch deliveries';
      set({
        error: message,
        isLoading: false,
      });
      useToastStore.getState().addToast(message, 'error');
    }
  },

  // Fetch delivery counts for calendar
  fetchDeliveryCounts: async () => {
    set({ isLoadingCounts: true, error: null });
    try {
      const counts = await deliveriesApi.getCounts();
      set({ deliveryCounts: counts, isLoadingCounts: false });
    } catch (err) {
      const message = err instanceof Error ? err.message : 'Failed to fetch counts';
      set({
        error: message,
        isLoadingCounts: false,
      });
      useToastStore.getState().addToast(message, 'error');
    }
  },

  // Add new delivery
  addDelivery: async (delivery) => {
    set({ isLoading: true, error: null });
    try {
      await deliveriesApi.create(delivery);
      // Refresh deliveries for that date
      await get().fetchDeliveriesByDate(delivery.date);
      // Refresh counts
      await get().fetchDeliveryCounts();
      set({ isLoading: false });
    } catch (err) {
      const message = err instanceof Error ? err.message : 'Failed to create delivery';
      set({
        error: message,
        isLoading: false,
      });
      useToastStore.getState().addToast(message, 'error');
      throw err;
    }
  },

  // Update delivery
  updateDelivery: async (id, updates) => {
    set({ isLoading: true, error: null });
    try {
      await deliveriesApi.update(id, updates);
      // Refresh deliveries for that date
      await get().fetchDeliveriesByDate(updates.date);
      // Refresh counts (in case date changed)
      await get().fetchDeliveryCounts();
      set({ isLoading: false });
    } catch (err) {
      const message = err instanceof Error ? err.message : 'Failed to update delivery';
      set({
        error: message,
        isLoading: false,
      });
      useToastStore.getState().addToast(message, 'error');
      throw err;
    }
  },

  // Delete delivery
  deleteDelivery: async (id) => {
    set({ isLoading: true, error: null });
    try {
      await deliveriesApi.delete(id);
      // Remove from local state
      set((state) => ({
        deliveries: state.deliveries.filter((d) => d.id !== id),
        isLoading: false,
      }));
      // Refresh counts
      await get().fetchDeliveryCounts();
    } catch (err) {
      const message = err instanceof Error ? err.message : 'Failed to delete delivery';
      set({
        error: message,
        isLoading: false,
      });
      useToastStore.getState().addToast(message, 'error');
      throw err;
    }
  },

  // Toggle delivery status
  toggleStatus: async (id, currentStatus) => {
    set({ isLoading: true, error: null });
    try {
      const newStatus = currentStatus === 'new' ? 'delivered' : 'new';
      await deliveriesApi.updateStatus(id, newStatus);
      // Update local state
      set((state) => ({
        deliveries: state.deliveries.map((d) =>
          d.id === id
            ? { ...d, status: newStatus, updatedAt: Date.now() }
            : d
        ),
        isLoading: false,
      }));
    } catch (err) {
      const message = err instanceof Error ? err.message : 'Failed to update status';
      set({
        error: message,
        isLoading: false,
      });
      useToastStore.getState().addToast(message, 'error');
      throw err;
    }
  },

  // Getters (local filtering)
  getDeliveriesByDate: (date) => {
    return get().deliveries.filter((d) => d.date === date);
  },

  getDeliveriesByDateRange: (startDate, endDate) => {
    return get().deliveries.filter((d) => {
      const date = d.date;
      return date >= startDate && date <= endDate;
    });
  },

  getDeliveryCountsByDate: () => {
    return get().deliveryCounts;
  },

  clearError: () => set({ error: null }),
}));