// @flow
import { Search } from "js-search";
import { last } from "lodash";
import { SearchIcon } from "outline-icons";
import * as React from "react";
import { useTranslation } from "react-i18next";
import AutoSizer from "react-virtualized-auto-sizer";
import { FixedSizeList as List } from "react-window";
import { Dialog, DialogBackdrop, type DialogStateReturn } from "reakit";
import styled, { useTheme } from "styled-components";
import breakpoint from "styled-components-breakpoint";
import { type DocumentPath } from "stores/CollectionsStore";
import Document from "models/Document";
import Button from "components/Button";
import Divider from "components/Divider";
import Flex from "components/Flex";
import PathToDocument from "components/PathToDocument";
import useStores from "hooks/useStores";
import useToasts from "hooks/useToasts";

type Props = {|
  dialog: DialogStateReturn,
  document: Document,
  onSave: ({
    done?: boolean,
    publish?: boolean,
    autosave?: boolean,
  }) => void,
|};

const PublishDialog = ({ dialog, document, onSave }: Props) => {
  const theme = useTheme();
  const { t } = useTranslation();
  const [searchTerm, setSearchTerm] = React.useState();
  const [selectedPath, setSelectedPath] = React.useState<?DocumentPath>();
  const { collections, documents } = useStores();
  const { showToast } = useToasts();

  const handleFilter = (ev) => {
    setSearchTerm(ev.target.value);
  };

  const handlePublishFromModal = async (selectedPath) => {
    if (!document) return;
    if (!selectedPath) {
      showToast(t("Please select a path"));
      return;
    }
    dialog.setVisible(false);

    if (selectedPath.type === "collection") {
      onSave({
        done: true,
        publish: true,
        collectionId: selectedPath.collectionId,
      });
    } else {
      onSave({
        done: true,
        publish: true,
        collectionId: selectedPath.collectionId,
        parentDocumentId: selectedPath.id,
      });
    }
  };

  const checked = React.useCallback(
    (result) => {
      if (!selectedPath) return;

      if (selectedPath.type === "collection" && selectedPath.id === result.id) {
        return true;
      }
      if (
        selectedPath.type === "document" &&
        selectedPath.id === result.id &&
        selectedPath.collectionId === result.collectionId
      ) {
        return true;
      }
      return false;
    },
    [selectedPath]
  );

  const searchIndex = React.useMemo(() => {
    const paths = collections.pathsToDocuments;
    const index = new Search("id");
    index.addIndex("title");

    // Build index
    const indexeableDocuments = [];
    paths.forEach((path) => {
      const doc = documents.get(path.id);
      if (!doc || !doc.isTemplate) {
        indexeableDocuments.push(path);
      }
    });
    index.addDocuments(indexeableDocuments);

    return index;
  }, [documents, collections.pathsToDocuments]);

  const results: DocumentPath[] = React.useMemo(() => {
    const onlyShowCollections = document.isTemplate;
    let results = [];
    if (collections.isLoaded) {
      if (searchTerm) {
        results = searchIndex.search(searchTerm);
      } else {
        results = searchIndex._documents;
      }
    }

    if (onlyShowCollections) {
      results = results.filter((result) => result.type === "collection");
    } else {
      // Exclude root from search results if document is already at the root
      if (!document.parentDocumentId) {
        results = results.filter(
          (result) => result.id !== document.collectionId
        );
      }

      // Exclude document if on the path to result, or the same result
      results = results.filter(
        (result) =>
          !result.path.map((doc) => doc.id).includes(document.id) &&
          last(result.path.map((doc) => doc.id)) !== document.parentDocumentId
      );
    }

    return results;
  }, [document, collections, searchTerm, searchIndex]);

  const row = ({ index, data, style }) => {
    const result = data[index];
    return (
      <PathToDocument
        result={result}
        document={document}
        collection={collections.get(result.collectionId)}
        onSelect={(result) => setSelectedPath(result)}
        style={style}
        checked={checked(result)}
      />
    );
  };

  const data = results;

  return (
    <Wrapper>
      <DialogBackdrop {...dialog}>
        <Dialog
          {...dialog}
          aria-label="Choose a collection"
          preventBodyScroll
          hideOnEsc
        >
          <Position>
            <Content>
              <Flex align="center">
                <StyledIcon
                  type="Search"
                  size={26}
                  color={theme.textTertiary}
                />
                <Input
                  type="search"
                  placeholder={`${t("Search collections & documents")}…`}
                  onChange={handleFilter}
                  autoFocus
                />
              </Flex>
              <Results>
                <AutoSizer>
                  {({ width, height }) => {
                    return (
                      <Flex role="listbox" column>
                        <List
                          key={data.length}
                          width={width}
                          height={height}
                          itemData={data}
                          itemCount={data.length}
                          itemSize={40}
                          itemKey={(index, data) => data[index].id}
                        >
                          {row}
                        </List>
                      </Flex>
                    );
                  }}
                </AutoSizer>
              </Results>
              <Divider />
              <ButtonWrapper justify="flex-end">
                <Button
                  disabled={!selectedPath}
                  onClick={() => handlePublishFromModal(selectedPath)}
                >
                  Publish
                </Button>
              </ButtonWrapper>
            </Content>
          </Position>
        </Dialog>
      </DialogBackdrop>
    </Wrapper>
  );
};

const Wrapper = styled.div`
  position: relative;
`;

const Position = styled.div`
  position: absolute;
  z-index: ${(props) => props.theme.depths.menu};
  right: 8vh;
  top: 4vh;

  ${breakpoint("mobile", "tablet")`
    position: fixed !important;
    transform: none !important;
    top: auto !important;
    right: 8px !important;
    bottom: 16px !important;
    left: 8px !important;
  `};
`;

const Results = styled.div`
  padding: 8px 0;
  height: calc(93% - 52px);
`;

const Content = styled.div`
  background: ${(props) => props.theme.background};
  width: 70vw;
  max-width: 600px;
  height: 40vh;
  max-height: 500px;
  border-radius: 8px;
  padding: 10px;
  box-shadow: ${(props) => props.theme.menuShadow};

  ${breakpoint("mobile", "tablet")`
    right: -2vh;
    width: 90vw;
`};
`;

const Input = styled.input`
  width: 100%;
  padding: 10px 10px 10px 40px;
  font-size: 16px;
  font-weight: 400;
  outline: none;
  border: 0;
  background: ${(props) => props.theme.sidebarBackground};
  transition: ${(props) => props.theme.backgroundTransition};
  border-radius: 4px;

  color: ${(props) => props.theme.text};

  ::-webkit-search-cancel-button {
    -webkit-appearance: none;
  }
  ::-webkit-input-placeholder {
    color: ${(props) => props.theme.placeholder};
  }
  :-moz-placeholder {
    color: ${(props) => props.theme.placeholder};
  }
  ::-moz-placeholder {
    color: ${(props) => props.theme.placeholder};
  }
  :-ms-input-placeholder {
    color: ${(props) => props.theme.placeholder};
  }
`;

const StyledIcon = styled(SearchIcon)`
  position: absolute;
  left: 12px;
`;

const ButtonWrapper = styled(Flex)`
  margin: 10px 0;
`;

export default PublishDialog;