import { defineStore } from "pinia";
import { ref, computed } from "vue";
import ClientGroupService, {
  ClientGroup,
  CreateClientGroupPayload,
  UpdateClientGroupPayload,
} from "@/services/clientGroup";

export const useClientGroupStore = defineStore("clientGroup", () => {
  // State
  const clientGroups = ref<ClientGroup[]>([]);
  const currentClientGroup = ref<ClientGroup | null>(null);
  const loading = ref(false);
  const error = ref<string | null>(null);

  // Pagination state
  const pagination = ref({
    current_page: 1,
    last_page: 1,
    per_page: 10,
    total: 0,
  });

  // Getters
  const allClientGroups = computed(() => clientGroups.value);
  const isLoading = computed(() => loading.value);
  const hasError = computed(() => error.value !== null);
  const getError = computed(() => error.value);
  const getClientGroupById = computed(() => (id: number) =>
    clientGroups.value.find((group) => group.id === id)
  );
  const getPagination = computed(() => pagination.value);

  // Actions
  const setLoading = (isLoading: boolean) => {
    loading.value = isLoading;
  };

  const setError = (err: string | null) => {
    error.value = err;
  };

  const setClientGroups = (newClientGroups: ClientGroup[]) => {
    clientGroups.value = newClientGroups;
  };

  const setCurrentClientGroup = (group: ClientGroup | null) => {
    currentClientGroup.value = group;
  };

  const setPagination = (meta: any) => {
    if (meta) {
      pagination.value = {
        current_page: meta.current_page || 1,
        last_page: meta.last_page || 1,
        per_page: meta.per_page || 10,
        total: meta.total || 0,
      };
    }
  };

  /**
   * Fetch all client groups with optional pagination and filters
   */
  const fetchClientGroups = async (params?: {
    page?: number;
    per_page?: number;
    search?: string;
  }) => {
    setLoading(true);
    setError(null);

    try {
      const response = await ClientGroupService.getAllClientGroups(params);
      setClientGroups(response.data);
      if (response.meta) {
        setPagination(response.meta);
      }
      return response;
    } catch (err: any) {
      const errorMessage =
        err.response?.data?.message || err.message || "Failed to fetch client groups";
      setError(errorMessage);
      throw err;
    } finally {
      setLoading(false);
    }
  };

  /**
   * Fetch a single client group by ID
   */
  const fetchClientGroup = async (id: number) => {
    setLoading(true);
    setError(null);

    try {
      const response = await ClientGroupService.getClientGroup(id);
      setCurrentClientGroup(response.data);
      return response.data;
    } catch (err: any) {
      const errorMessage =
        err.response?.data?.message || err.message || "Failed to fetch client group";
      setError(errorMessage);
      throw err;
    } finally {
      setLoading(false);
    }
  };

  /**
   * Create a new client group
   */
  const createClientGroup = async (payload: CreateClientGroupPayload) => {
    setLoading(true);
    setError(null);

    try {
      const response = await ClientGroupService.createClientGroup(payload);
      // Add the new group to the list
      clientGroups.value.push(response.data);
      setCurrentClientGroup(response.data);
      return response.data;
    } catch (err: any) {
      const errorMessage =
        err.response?.data?.message || err.message || "Failed to create client group";
      setError(errorMessage);
      throw err;
    } finally {
      setLoading(false);
    }
  };

  /**
   * Update an existing client group
   */
  const updateClientGroup = async (payload: UpdateClientGroupPayload) => {
    setLoading(true);
    setError(null);

    try {
      const response = await ClientGroupService.updateClientGroup(payload);
      const updatedGroup = response.data;

      // Update in the groups list
      const index = clientGroups.value.findIndex(
        (group) => group.id === updatedGroup.id
      );
      if (index !== -1) {
        clientGroups.value[index] = updatedGroup;
      }

      // Update current group if it's the one being edited
      if (currentClientGroup.value && currentClientGroup.value.id === updatedGroup.id) {
        setCurrentClientGroup(updatedGroup);
      }

      return updatedGroup;
    } catch (err: any) {
      const errorMessage =
        err.response?.data?.message || err.message || "Failed to update client group";
      setError(errorMessage);
      throw err;
    } finally {
      setLoading(false);
    }
  };

  /**
   * Delete a client group
   */
  const deleteClientGroup = async (id: number) => {
    setLoading(true);
    setError(null);

    try {
      const response = await ClientGroupService.deleteClientGroup(id);

      // Remove from the groups list
      clientGroups.value = clientGroups.value.filter((group) => group.id !== id);

      // Clear current group if it's the one being deleted
      if (currentClientGroup.value && currentClientGroup.value.id === id) {
        setCurrentClientGroup(null);
      }

      return response;
    } catch (err: any) {
      const errorMessage =
        err.response?.data?.message || err.message || "Failed to delete client group";
      setError(errorMessage);
      throw err;
    } finally {
      setLoading(false);
    }
  };

  return {
    // State
    clientGroups,
    currentClientGroup,
    loading,
    error,
    pagination,

    // Getters
    allClientGroups,
    isLoading,
    hasError,
    getError,
    getClientGroupById,
    getPagination,

    // Actions
    fetchClientGroups,
    fetchClientGroup,
    createClientGroup,
    updateClientGroup,
    deleteClientGroup,
  };
});