import { useEffect, useRef } from "react";
import { combine } from "@atlaskit/pragmatic-drag-and-drop/combine";
import { autoScrollForElements } from "@atlaskit/pragmatic-drag-and-drop-auto-scroll/element";
import { observer } from "mobx-react";
// components
import { MultipleSelectGroup } from "@/components/core";
import {
  BiWeekChartView,
  DayChartView,
  GanttChartBlocksList,
  GanttChartSidebar,
  HourChartView,
  IBlockUpdateData,
  IGanttBlock,
  MonthChartView,
  QuarterChartView,
  TGanttViews,
  WeekChartView,
  YearChartView,
} from "@/components/gantt-chart";
import { IssueBulkOperationsRoot } from "@/components/issues";
// helpers
import { cn } from "@/helpers/common.helper";
// constants
import { GANTT_SELECT_GROUP } from "../constants";
// hooks
import { useGanttChart } from "../hooks/use-gantt-chart";

type Props = {
  blocks: IGanttBlock[] | null;
  blockToRender: (data: any) => React.ReactNode;
  blockUpdateHandler: (block: any, payload: IBlockUpdateData) => void;
  bottomSpacing: boolean;
  chartBlocks: IGanttBlock[] | null;
  enableBlockLeftResize: boolean;
  enableBlockMove: boolean;
  enableBlockRightResize: boolean;
  enableReorder: boolean;
  enableAddBlock: boolean;
  enableSelection: boolean;
  itemsContainerWidth: number;
  showAllBlocks: boolean;
  sidebarToRender: (props: any) => React.ReactNode;
  title: string;
  updateCurrentViewRenderPayload: (direction: "left" | "right", currentView: TGanttViews) => void;
  quickAdd?: React.JSX.Element | undefined;
};

export const GanttChartMainContent: React.FC<Props> = observer((props) => {
  const {
    blocks,
    blockToRender,
    blockUpdateHandler,
    bottomSpacing,
    chartBlocks,
    enableBlockLeftResize,
    enableBlockMove,
    enableBlockRightResize,
    enableReorder,
    enableAddBlock,
    enableSelection,
    itemsContainerWidth,
    showAllBlocks,
    sidebarToRender,
    title,
    updateCurrentViewRenderPayload,
    quickAdd,
  } = props;
  // refs
  const ganttContainerRef = useRef<HTMLDivElement>(null);
  // chart hook
  const { currentView, currentViewData } = useGanttChart();

  // Enable Auto Scroll for Ganttlist
  useEffect(() => {
    const element = ganttContainerRef.current;

    if (!element) return;

    return combine(
      autoScrollForElements({
        element,
        getAllowedAxis: () => "vertical",
      })
    );
  }, [ganttContainerRef?.current]);
  // handling scroll functionality
  const onScroll = (e: React.UIEvent<HTMLDivElement, UIEvent>) => {
    const { clientWidth, scrollLeft, scrollWidth } = e.currentTarget;

    // updateScrollLeft(scrollLeft);

    const approxRangeLeft = scrollLeft >= clientWidth + 1000 ? 1000 : scrollLeft - clientWidth;
    const approxRangeRight = scrollWidth - (scrollLeft + clientWidth);

    if (approxRangeRight < 1000) updateCurrentViewRenderPayload("right", currentView);
    if (approxRangeLeft < 1000) updateCurrentViewRenderPayload("left", currentView);
  };

  const CHART_VIEW_COMPONENTS: {
    [key in TGanttViews]: React.FC;
  } = {
    hours: HourChartView,
    day: DayChartView,
    week: WeekChartView,
    bi_week: BiWeekChartView,
    month: MonthChartView,
    quarter: QuarterChartView,
    year: YearChartView,
  };

  if (!currentView) return null;
  const ActiveChartView = CHART_VIEW_COMPONENTS[currentView];

  return (
    <MultipleSelectGroup
      containerRef={ganttContainerRef}
      entities={{
        [GANTT_SELECT_GROUP]: chartBlocks?.map((block) => block.id) ?? [],
      }}
    >
      {(helpers) => (
        <>
          <div
            // DO NOT REMOVE THE ID
            id="gantt-container"
            className={cn(
              "h-full w-full overflow-auto vertical-scrollbar horizontal-scrollbar scrollbar-lg flex border-t-[0.5px] border-custom-border-200",
              {
                "mb-8": bottomSpacing,
              }
            )}
            ref={ganttContainerRef}
            onScroll={onScroll}
          >
            <GanttChartSidebar
              blocks={blocks}
              blockUpdateHandler={blockUpdateHandler}
              enableReorder={enableReorder}
              enableSelection={enableSelection}
              sidebarToRender={sidebarToRender}
              title={title}
              quickAdd={quickAdd}
              selectionHelpers={helpers}
            />
            <div className="relative min-h-full h-max flex-shrink-0 flex-grow">
              <ActiveChartView />
              {currentViewData && (
                <GanttChartBlocksList
                  itemsContainerWidth={itemsContainerWidth}
                  blocks={chartBlocks}
                  blockToRender={blockToRender}
                  blockUpdateHandler={blockUpdateHandler}
                  enableBlockLeftResize={enableBlockLeftResize}
                  enableBlockRightResize={enableBlockRightResize}
                  enableBlockMove={enableBlockMove}
                  enableAddBlock={enableAddBlock}
                  ganttContainerRef={ganttContainerRef}
                  showAllBlocks={showAllBlocks}
                  selectionHelpers={helpers}
                />
              )}
            </div>
          </div>
          <IssueBulkOperationsRoot />
        </>
      )}
    </MultipleSelectGroup>
  );
});
