grungnet/src/modals/ImportExportModal.js

import React, { useRef, useState, useEffect } from "react";
import { Box, Label, Text, Button, Flex } from "theme-ui";
import { saveAs } from "file-saver";
import * as Comlink from "comlink";
import shortid from "shortid";

import Modal from "../components/Modal";
import LoadingOverlay from "../components/LoadingOverlay";
import LoadingBar from "../components/LoadingBar";
import Banner from "../components/Banner";

import { useAuth } from "../contexts/AuthContext";

import SelectDataModal from "./SelectDataModal";

import { getDatabase } from "../database";

import DatabaseWorker from "worker-loader!../workers/DatabaseWorker"; // eslint-disable-line import/no-webpack-loader-syntax

const worker = Comlink.wrap(new DatabaseWorker());

const importDBName = "OwlbearRodeoImportDB";

function ImportExportModal({ isOpen, onRequestClose }) {
  const { userId } = useAuth();
  const [isLoading, setIsLoading] = useState(false);
  const [error, setError] = useState();

  const backgroundTaskRunningRef = useRef(false);
  const fileInputRef = useRef();

  const [showImportSelector, setShowImportSelector] = useState(false);
  const [showExportSelector, setShowExportSelector] = useState(false);

  function openFileDialog() {
    if (fileInputRef.current) {
      fileInputRef.current.click();
    }
  }

  const loadingProgressRef = useRef(0);

  function handleDBProgress({ completedRows, totalRows }) {
    loadingProgressRef.current = completedRows / totalRows;
  }

  async function handleImportDatabase(file) {
    setIsLoading(true);
    backgroundTaskRunningRef.current = true;
    try {
      await worker.importData(
        file,
        importDBName,
        Comlink.proxy(handleDBProgress)
      );

      setIsLoading(false);
      setShowImportSelector(true);
      backgroundTaskRunningRef.current = false;
    } catch (e) {
      setIsLoading(false);
      backgroundTaskRunningRef.current = false;
      if (e.message.startsWith("Max buffer length exceeded")) {
        setError(
          new Error(
            "Max image size exceeded ensure your database doesn't have an image over 100MB"
          )
        );
      } else {
        setError(e);
      }
    }
    // Set file input to null to allow adding the same data 2 times in a row
    if (fileInputRef.current) {
      fileInputRef.current.value = null;
    }
  }

  function handleExportDatabase() {
    setShowExportSelector(true);
  }

  useEffect(() => {
    function handleBeforeUnload(event) {
      if (backgroundTaskRunningRef.current) {
        event.returnValue =
          "Database is still processing, are you sure you want to leave?";
      }
    }

    window.addEventListener("beforeunload", handleBeforeUnload);
    return () => {
      window.removeEventListener("beforeunload", handleBeforeUnload);
    };
  }, []);

  function handleClose() {
    if (isLoading) {
      return;
    }
    onRequestClose();
  }

  async function handleImportSelectorClose() {
    const importDB = getDatabase({}, importDBName);
    await importDB.delete();
    importDB.close();
    setShowImportSelector(false);
  }

  async function handleImportSelectorConfirm(checkedMaps, checkedTokens) {
    setIsLoading(true);
    backgroundTaskRunningRef.current = true;
    setShowImportSelector(false);
    loadingProgressRef.current = 0;

    const importDB = getDatabase({}, importDBName);
    const db = getDatabase({});

    // Keep track of a mapping of old token ids to new ones to apply them to the map states
    let newTokenIds = {};
    if (checkedTokens.length > 0) {
      const tokenIds = checkedTokens.map((token) => token.id);
      const tokensToAdd = await importDB.table("tokens").bulkGet(tokenIds);
      let newTokens = [];
      for (let token of tokensToAdd) {
        const newId = shortid.generate();
        newTokenIds[token.id] = newId;
        // Generate new id and change owner
        newTokens.push({ ...token, id: newId, owner: userId });
      }
      await db.table("tokens").bulkAdd(newTokens);
    }

    if (checkedMaps.length > 0) {
      const mapIds = checkedMaps.map((map) => map.id);
      const mapsToAdd = await importDB.table("maps").bulkGet(mapIds);
      let newMaps = [];
      let newStates = [];
      for (let map of mapsToAdd) {
        let state = await importDB.table("states").get(map.id);
        // Apply new token ids to imported state
        for (let tokenState of Object.values(state.tokens)) {
          if (tokenState.tokenId in newTokenIds) {
            state.tokens[tokenState.id].tokenId =
              newTokenIds[tokenState.tokenId];
          }
        }
        const newId = shortid.generate();
        // Generate new id and change owner
        newMaps.push({ ...map, id: newId, owner: userId });
        newStates.push({ ...state, mapId: newId });
      }
      await db.table("maps").bulkAdd(newMaps);
      await db.table("states").bulkAdd(newStates);
    }

    await importDB.delete();
    importDB.close();
    db.close();
    setIsLoading(false);
    backgroundTaskRunningRef.current = false;
  }

  function exportSelectorFilter(table, value) {
    // Only show owned maps and tokens
    if (table === "maps" || table === "tokens") {
      if (value.owner === userId) {
        return true;
      }
    }
    // Allow all states so tokens can be checked against maps
    if (table === "states") {
      return true;
    }
    return false;
  }

  async function handleExportSelectorClose() {
    setShowExportSelector(false);
  }

  async function handleExportSelectorConfirm(checkedMaps, checkedTokens) {
    setShowExportSelector(false);
    setIsLoading(true);
    backgroundTaskRunningRef.current = true;

    const mapIds = checkedMaps.map((map) => map.id);
    const tokenIds = checkedTokens.map((token) => token.id);

    try {
      const blob = await worker.exportData(
        Comlink.proxy(handleDBProgress),
        mapIds,
        tokenIds
      );
      saveAs(blob, `${new Date().toISOString()}.owlbear`);
    } catch (e) {
      setError(e);
    }
    setIsLoading(false);
    backgroundTaskRunningRef.current = false;
  }

  return (
    <Modal isOpen={isOpen} onRequestClose={handleClose} allowClose={!isLoading}>
      <Flex
        sx={{
          flexDirection: "column",
          justifyContent: "center",
          maxWidth: "300px",
          flexGrow: 1,
        }}
        m={2}
      >
        <Box>
          <Label>Import / Export</Label>
          <Text as="p" mb={2} variant="caption">
            Select import or export then select the data you wish to use
          </Text>
          <input
            onChange={(event) => handleImportDatabase(event.target.files[0])}
            type="file"
            accept=".owlbear"
            style={{ display: "none" }}
            ref={fileInputRef}
          />
          <Flex>
            <Button mr={1} sx={{ flexGrow: 1 }} onClick={openFileDialog}>
              Import
            </Button>
            <Button ml={1} sx={{ flexGrow: 1 }} onClick={handleExportDatabase}>
              Export
            </Button>
          </Flex>
        </Box>
        {isLoading && (
          <Box
            sx={{
              width: "100%",
              height: "100%",
              position: "absolute",
              top: 0,
              left: 0,
            }}
          >
            <LoadingOverlay />
            <LoadingBar
              isLoading={isLoading}
              loadingProgressRef={loadingProgressRef}
            />
          </Box>
        )}
        <Banner isOpen={!!error} onRequestClose={() => setError()}>
          <Box p={1}>
            <Text as="p" variant="body2">
              Error: {error && error.message}
            </Text>
          </Box>
        </Banner>
        <SelectDataModal
          isOpen={showImportSelector}
          onRequestClose={handleImportSelectorClose}
          onConfirm={handleImportSelectorConfirm}
          databaseName={importDBName}
          confirmText="Import"
          label="Select data to import"
        />
        <SelectDataModal
          isOpen={showExportSelector}
          onRequestClose={handleExportSelectorClose}
          onConfirm={handleExportSelectorConfirm}
          confirmText="Export"
          label="Select data to export"
          filter={exportSelectorFilter}
        />
      </Flex>
    </Modal>
  );
}

export default ImportExportModal;