import { create } from 'zustand';
import type { SelectedNode, NetworkFilters, ScopeSelection } from '@/types/referralNetwork';

export const MAX_SCOPE_ITEMS = 50;

const DEFAULT_FILTERS: NetworkFilters = {
  campaigns: [],
  partnersOnly: false,
  minReferrals: 0,
};

function resetGraphState() {
  return {
    selectedNode: null as SelectedNode,
    hoveredNodeId: null as string | null,
    highlightedNodes: new Set<string>(),
    filters: { ...DEFAULT_FILTERS },
  };
}

interface ReferralNetworkState {
  selectedNode: SelectedNode;
  hoveredNodeId: string | null;
  highlightedNodes: Set<string>;
  filters: NetworkFilters;
  scope: ScopeSelection[];
  isFullNetwork: boolean;

  setSelectedNode: (node: SelectedNode) => void;
  setHoveredNode: (id: string | null) => void;
  setHighlightedNodes: (nodes: Set<string>) => void;
  updateFilters: (filters: Partial<NetworkFilters>) => void;
  resetFilters: () => void;
  setFullNetwork: (enabled: boolean) => void;
  addScope: (item: ScopeSelection) => void;
  removeScope: (type: ScopeSelection['type'], id: number) => void;
  clearScope: () => void;
}

export const useReferralNetworkStore = create<ReferralNetworkState>()((set) => ({
  selectedNode: null,
  hoveredNodeId: null,
  highlightedNodes: new Set<string>(),
  filters: { ...DEFAULT_FILTERS },
  scope: [],
  isFullNetwork: false,

  setSelectedNode: (node) => set({ selectedNode: node }),
  setHoveredNode: (id) => set({ hoveredNodeId: id }),
  setHighlightedNodes: (nodes) => set({ highlightedNodes: nodes }),

  updateFilters: (partial) =>
    set((state) => ({
      filters: { ...state.filters, ...partial },
    })),

  resetFilters: () => set({ filters: { ...DEFAULT_FILTERS } }),

  // Full network and a scope selection are mutually exclusive: the whole graph
  // already contains every campaign, partner and user, so narrowing it by chips
  // would be meaningless. Each mode therefore drops the other.
  setFullNetwork: (enabled) =>
    set({
      isFullNetwork: enabled,
      scope: [],
      ...resetGraphState(),
    }),

  addScope: (item) =>
    set((state) => {
      const exists = state.scope.some((s) => s.type === item.type && s.id === item.id);
      if (exists) return state;
      if (state.scope.length >= MAX_SCOPE_ITEMS) return state;
      return {
        scope: [...state.scope, item],
        isFullNetwork: false,
        ...resetGraphState(),
      };
    }),

  removeScope: (type, id) =>
    set((state) => {
      const next = state.scope.filter((s) => !(s.type === type && s.id === id));
      if (next.length === 0) {
        return { scope: next, ...resetGraphState() };
      }
      return { scope: next };
    }),

  clearScope: () =>
    set({
      scope: [],
      isFullNetwork: false,
      ...resetGraphState(),
    }),
}));