import { Backlink } from "@dashboard/components/Backlink";
import CardSpacer from "@dashboard/components/CardSpacer";
import Form from "@dashboard/components/Form";
import Grid from "@dashboard/components/Grid";
import { DetailPageLayout } from "@dashboard/components/Layouts";
import Savebar from "@dashboard/components/Savebar";
import { MenuDetailsFragment, MenuErrorFragment } from "@dashboard/graphql";
import { SubmitPromise } from "@dashboard/hooks/useForm";
import useNavigator from "@dashboard/hooks/useNavigator";
import { sectionNames } from "@dashboard/intl";
import { menuListUrl } from "@dashboard/navigation/urls";
import { Typography } from "@material-ui/core";
import { ConfirmButtonTransitionState } from "@saleor/macaw-ui";
import { Box } from "@saleor/macaw-ui/next";
import React from "react";
import { FormattedMessage, useIntl } from "react-intl";

import { MenuItemType } from "../MenuItemDialog";
import MenuItems, { TreeOperation } from "../MenuItems";
import MenuProperties from "../MenuProperties";
import { computeRelativeTree } from "./tree";

export interface MenuDetailsFormData {
  name: string;
}

export interface MenuDetailsSubmitData extends MenuDetailsFormData {
  operations: TreeOperation[];
}

export interface MenuDetailsPageProps {
  saveButtonState: ConfirmButtonTransitionState;
  disabled: boolean;
  errors: MenuErrorFragment[];
  menu: MenuDetailsFragment;
  onDelete: () => void;
  onItemAdd: () => void;
  onItemClick: (id: string, type: MenuItemType) => void;
  onItemEdit: (id: string) => void;
  onSubmit: (data: MenuDetailsSubmitData) => SubmitPromise;
}

const MenuDetailsPage: React.FC<MenuDetailsPageProps> = ({
  disabled,
  errors,
  menu,
  saveButtonState,
  onDelete,
  onItemAdd,
  onItemClick,
  onItemEdit,
  onSubmit,
}) => {
  const intl = useIntl();
  const navigate = useNavigator();

  const initialForm: MenuDetailsFormData = {
    name: menu?.name ?? "",
  };

  const [treeOperations, setTreeOperations] = React.useState<TreeOperation[]>(
    [],
  );

  const removeSimulatedMoves = (operations: TreeOperation[]) =>
    operations.filter(operation => !operation.simulatedMove);

  const handleSubmit = async (data: MenuDetailsFormData) => {
    const result = await onSubmit({
      name: data.name,
      operations: removeSimulatedMoves(treeOperations),
    });

    if (result) {
      setTreeOperations([]);
    }

    return result;
  };

  const handleChange = (operations: TreeOperation[]) => {
    setTreeOperations([...treeOperations, ...operations]);
  };

  return (
    <Form confirmLeave initial={initialForm} onSubmit={handleSubmit}>
      {({ change, data, submit }) => (
        <DetailPageLayout gridTemplateColumns={1}>
          <DetailPageLayout.Content>
            <Box padding="s6" margin="auto" height="100vh">
              <Backlink href={menuListUrl()}>
                {intl.formatMessage(sectionNames.navigation)}
              </Backlink>
              <Grid variant="inverted">
                <div>
                  <Typography variant="h5">
                    {intl.formatMessage(sectionNames.navigation)}
                  </Typography>
                  <Typography>
                    <FormattedMessage
                      id="E54eoT"
                      defaultMessage="Creating the navigation structure is done by dragging and dropping. Simply create a new menu item and then drag it into its destined place. You can move items inside one another to create a tree structure and drag items up and down to create a hierarchy"
                    />
                  </Typography>
                </div>
                <div>
                  <MenuProperties
                    data={data}
                    disabled={disabled}
                    errors={errors}
                    onChange={change}
                  />
                  <CardSpacer />
                  <MenuItems
                    canUndo={treeOperations.length > 0}
                    items={
                      menu?.items
                        ? computeRelativeTree(menu.items, treeOperations)
                        : []
                    }
                    onChange={handleChange}
                    onItemAdd={onItemAdd}
                    onItemClick={onItemClick}
                    onItemEdit={onItemEdit}
                    onUndo={() =>
                      setTreeOperations(operations => {
                        if (operations.length > 1) {
                          // Undo of a simulated move needs removal of 2 moves instead of one
                          if (operations[operations.length - 2].simulatedMove) {
                            return operations.slice(0, operations.length - 2);
                          }
                        }
                        return operations.slice(0, operations.length - 1);
                      })
                    }
                  />
                </div>
              </Grid>
              <Savebar
                onCancel={() => navigate(menuListUrl())}
                disabled={disabled || treeOperations.length === 0}
                onDelete={onDelete}
                onSubmit={submit}
                state={saveButtonState}
              />
            </Box>
          </DetailPageLayout.Content>
        </DetailPageLayout>
      )}
    </Form>
  );
};
MenuDetailsPage.displayName = "MenuDetailsPage";
export default MenuDetailsPage;