import { create } from 'zustand';
import { apiFetch } from '@/lib/browser-navigation';
import type { Resource, ResourceBooking } from '@/lib/resources/client';

interface ResourceState {
  resources: Resource[];
  selectedResources: Resource[];
  bookings: ResourceBooking[];
  isLoading: boolean;
  bookingError: string | null;

  fetchResources: (type?: string) => Promise<void>;
  searchResources: (query: string) => Resource[];
  toggleResource: (resource: Resource) => void;
  selectResource: (resource: Resource) => void;
  deselectResource: (resourceId: string) => void;
  clearSelection: () => void;

  fetchEventBookings: (eventId: string) => Promise<void>;
  bookSelectedResources: (start: string, end: string, eventId?: string) => Promise<string[]>;
  cancelBooking: (bookingId: string) => Promise<void>;
  cancelEventBookings: (eventId: string) => Promise<void>;
}

export const useResourceStore = create<ResourceState>()((set, get) => ({
  resources: [],
  selectedResources: [],
  bookings: [],
  isLoading: false,
  bookingError: null,

  fetchResources: async (type?: string) => {
    set({ isLoading: true });
    try {
      const params = new URLSearchParams();
      if (type) params.set('type', type);
      const res = await apiFetch(`/api/resources?${params.toString()}`);
      if (!res.ok) throw new Error('Failed to fetch resources');
      const data = await res.json();
      set({ resources: data.resources, isLoading: false });
    } catch {
      set({ isLoading: false });
    }
  },

  searchResources: (query: string) => {
    const { resources } = get();
    if (!query.trim()) return resources;
    const lower = query.toLowerCase();
    return resources.filter(
      (r) =>
        r.name.toLowerCase().includes(lower) ||
        (r.location && r.location.toLowerCase().includes(lower)) ||
        (r.description && r.description.toLowerCase().includes(lower))
    );
  },

  toggleResource: (resource: Resource) => {
    const { selectedResources } = get();
    const exists = selectedResources.some((r) => r.id === resource.id);
    if (exists) {
      set({ selectedResources: selectedResources.filter((r) => r.id !== resource.id) });
    } else {
      set({ selectedResources: [...selectedResources, resource] });
    }
  },

  selectResource: (resource: Resource) => {
    const { selectedResources } = get();
    if (!selectedResources.some((r) => r.id === resource.id)) {
      set({ selectedResources: [...selectedResources, resource] });
    }
  },

  deselectResource: (resourceId: string) => {
    set({ selectedResources: get().selectedResources.filter((r) => r.id !== resourceId) });
  },

  clearSelection: () => {
    set({ selectedResources: [], bookingError: null });
  },

  fetchEventBookings: async (eventId: string) => {
    try {
      const res = await apiFetch(`/api/resources?eventId=${encodeURIComponent(eventId)}`);
      if (!res.ok) return;
      const data = await res.json();
      set({ bookings: data.bookings || [] });
    } catch {
      // silently fail
    }
  },

  bookSelectedResources: async (start: string, end: string, eventId?: string) => {
    set({ bookingError: null });
    const { selectedResources } = get();
    const bookedIds: string[] = [];

    for (const resource of selectedResources) {
      try {
        const res = await apiFetch(`/api/resources/${resource.id}/book`, {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({ start, end, eventId }),
        });
        if (!res.ok) {
          const data = await res.json();
          set({ bookingError: `${resource.name}: ${data.error}` });
          continue;
        }
        const data = await res.json();
        bookedIds.push(data.booking.id);
      } catch {
        set({ bookingError: `Failed to book ${resource.name}` });
      }
    }

    return bookedIds;
  },

  cancelBooking: async (bookingId: string) => {
    const { bookings } = get();
    const booking = bookings.find((b) => b.id === bookingId);
    if (!booking) return;

    try {
      const res = await apiFetch(
        `/api/resources/${booking.resourceId}/book/${bookingId}`,
        { method: 'DELETE' }
      );
      if (res.ok) {
        set({ bookings: bookings.filter((b) => b.id !== bookingId) });
      }
    } catch {
      // silently fail
    }
  },

  cancelEventBookings: async (_eventId: string) => {
    const { bookings } = get();
    for (const booking of bookings) {
      try {
        const res = await apiFetch(
          `/api/resources/${booking.resourceId}/book/${booking.id}`,
          { method: 'DELETE' }
        );
        if (res.ok) continue;
      } catch {
        // silently fail
      }
    }
    set({ bookings: [] });
  },
}));