kandimat/redaktions-app/src/components/CategoryList.tsx

import {Paper, Typography} from "@material-ui/core";
import React, {useState} from "react";
import {makeStyles} from "@material-ui/core/styles";
import {useMutation, useQuery} from "@apollo/client";
import AddCard from "./AddCard";
import AccordionWithEdit from "./AccordionWithEdit";
import {
  BasicCategoryFragment,
  BasicCategoryResponse,
  GET_ALL_CATEGORIES,
  GetAllCategoriesResponse
} from "../backend/queries/category";
import ChangeCategoryDialog, {ChangeCategoryDialogContent} from "./ChangeCategoryDialog";
import {useSnackbar} from "notistack";
import {
  ADD_CATEGORY,
  AddCategoryResponse,
  AddCategoryVariables,
  EDIT_CATEGORY,
  EditCategoryResponse,
  EditCategoryVariables
} from "../backend/mutations/category";
import DeleteCategoryDialog, {
  deleteCategoryDialogId,
  deleteCategoryDialogOpen,
  deleteCategoryDialogTitle
} from "./DeleteCategoryDialog";

const useStyles = makeStyles((theme) => ({
  root: {
    width: '100%',
    padding: theme.spacing(1),
    marginBottom: theme.spacing(3),
  },
}));

const emptyChangeCategoryDialog: ChangeCategoryDialogContent = {
  id: "",
  title: "",
  details: "",
}

export default function CategoryList() {
  const [changeDialogOpen, setChangeDialogOpen] = useState(false);
  const [dialogTitle, setDialogTitle] = useState("");
  const [dialogConfirmButtonText, setDialogConfirmButtonText] = useState("");
  const [changeDialogContent, setChangeDialogContent] = useState(emptyChangeCategoryDialog);
  const { enqueueSnackbar } = useSnackbar();
  const categories = useQuery<GetAllCategoriesResponse, null>(GET_ALL_CATEGORIES).data?.allCategories.nodes;
  const [editCategory, {loading: editLoading}] = useMutation<EditCategoryResponse, EditCategoryVariables>(EDIT_CATEGORY, {
    onError: (e) => enqueueSnackbar(`Ein Fehler ist aufgetreten: ${e.message}`, { variant: "error"}),
    onCompleted: (response) => {
      if (response.updateCategory) {
        enqueueSnackbar("Kategorie erfolgreich geändert.", { variant: "success"})
        setChangeDialogOpen(false);
      } else {
        enqueueSnackbar("Ein Fehler ist aufgetreten, versuche es erneut.", { variant: "error"})
      }
    }
  });
  const [addCategory, {loading: addLoading}] = useMutation<AddCategoryResponse, AddCategoryVariables>(ADD_CATEGORY, {
    onError: (e) => enqueueSnackbar(`Ein Fehler ist aufgetreten: ${e.message}`, { variant: "error"}),
    onCompleted: (response) => {
      if (response.createCategory) {
        enqueueSnackbar("Kategorie erfolgreich hinzugefügt.", { variant: "success"})
        setChangeDialogOpen(false);
      } else {
        enqueueSnackbar("Ein Fehler ist aufgetreten, versuche es erneut.", { variant: "error"})
      }
    },
    update: (cache, { data }) => {
      cache.modify({
        fields: {
          allCategories(existingCategories = { nodes: []}) {
            const newCategoryRef = cache.writeFragment<BasicCategoryResponse | undefined>({
              data: data?.createCategory?.category,
              fragment: BasicCategoryFragment,
              fragmentName: "BasicCategoryFragment",
            });
            return {nodes: [...existingCategories.nodes, newCategoryRef]};
          }
        }
      });
    }
  });

  const classes = useStyles();

  const loading = editLoading || addLoading;

  const handleAddClick = () => {
    setDialogTitle("Neue Kategorie erstellen");
    setDialogConfirmButtonText("Erstellen");
    if (changeDialogContent.id !== "") {
      setChangeDialogContent(emptyChangeCategoryDialog);
    }
    setChangeDialogOpen(true);
  }

  const handleEditButtonClick = (category: BasicCategoryResponse) => {
    setDialogTitle("Kategorie bearbeiten");
    setDialogConfirmButtonText("Speichern")
    if (changeDialogContent.id !== category.id) {
      setChangeDialogContent({
        id: category.id,
        title: category.title,
        details: category.description,
      })
    }
    setChangeDialogOpen(true);
  };

  const handleDeleteButtonClick = (category: BasicCategoryResponse) => {
    deleteCategoryDialogTitle(category.title);
    deleteCategoryDialogId(category.id);
    deleteCategoryDialogOpen(true);
  }

  const handleDialogContentChange = (content: ChangeCategoryDialogContent) => {
    setChangeDialogContent(content)
  }

  const handleChangeConfirmButtonClick = () => {
    if (changeDialogContent.id !== "") {
      editCategory({
        variables: {
          id: changeDialogContent.id,
          title: changeDialogContent.title,
          description: changeDialogContent.details,
        }
      })
    } else {
      addCategory({
        variables: {
          title: changeDialogContent.title,
          description: changeDialogContent.details,
        }
      })
    }
  };

  return (
    <Paper className={classes.root}>
      <Typography component={"h2"} variant="h6" color="primary" gutterBottom>Kategorien</Typography>
      {categories?.map(category => <AccordionWithEdit
          key={category.id}
          title={category.title}
          description={category.description}
          onEditButtonClick={() => handleEditButtonClick(category)}
          onDeleteButtonClick={() => handleDeleteButtonClick(category)}
        />
      )}
      <AddCard handleClick={handleAddClick}/>
      <ChangeCategoryDialog
        title={dialogTitle}
        confirmButtonText={dialogConfirmButtonText}
        open={changeDialogOpen}
        content={changeDialogContent}
        loading={loading}
        handleContentChange={handleDialogContentChange}
        handleConfirmButtonClick={handleChangeConfirmButtonClick}
        handleClose={() => setChangeDialogOpen(false)}
      />
      <DeleteCategoryDialog/>
    </Paper>
  )
}