import { observer } from "mobx-react";
import { FC } from "react";
// hooks
import { useIssueDetail } from "hooks/store";
import { useChart } from "../hooks";
// helpers
import { ChartAddBlock, ChartDraggable } from "components/gantt-chart";
import { renderFormattedPayloadDate } from "helpers/date-time.helper";
import { cn } from "helpers/common.helper";
// types
import { IBlockUpdateData, IGanttBlock } from "../types";
// constants
import { BLOCK_HEIGHT, HEADER_HEIGHT } from "../constants";

export type GanttChartBlocksProps = {
  itemsContainerWidth: number;
  blocks: IGanttBlock[] | null;
  blockToRender: (data: any) => React.ReactNode;
  blockUpdateHandler: (block: any, payload: IBlockUpdateData) => void;
  enableBlockLeftResize: boolean;
  enableBlockRightResize: boolean;
  enableBlockMove: boolean;
  enableAddBlock: boolean;
  showAllBlocks: boolean;
};

export const GanttChartBlocksList: FC<GanttChartBlocksProps> = observer((props) => {
  const {
    itemsContainerWidth,
    blocks,
    blockToRender,
    blockUpdateHandler,
    enableBlockLeftResize,
    enableBlockRightResize,
    enableBlockMove,
    enableAddBlock,
    showAllBlocks,
  } = props;
  // store hooks
  const { peekIssue } = useIssueDetail();
  // chart hook
  const { activeBlock, dispatch } = useChart();

  // update the active block on hover
  const updateActiveBlock = (block: IGanttBlock | null) => {
    dispatch({
      type: "PARTIAL_UPDATE",
      payload: {
        activeBlock: block,
      },
    });
  };

  const handleChartBlockPosition = (
    block: IGanttBlock,
    totalBlockShifts: number,
    dragDirection: "left" | "right" | "move"
  ) => {
    if (!block.start_date || !block.target_date) return;

    const originalStartDate = new Date(block.start_date);
    const updatedStartDate = new Date(originalStartDate);

    const originalTargetDate = new Date(block.target_date);
    const updatedTargetDate = new Date(originalTargetDate);

    // update the start date on left resize
    if (dragDirection === "left") updatedStartDate.setDate(originalStartDate.getDate() - totalBlockShifts);
    // update the target date on right resize
    else if (dragDirection === "right") updatedTargetDate.setDate(originalTargetDate.getDate() + totalBlockShifts);
    // update both the dates on x-axis move
    else if (dragDirection === "move") {
      updatedStartDate.setDate(originalStartDate.getDate() + totalBlockShifts);
      updatedTargetDate.setDate(originalTargetDate.getDate() + totalBlockShifts);
    }

    // call the block update handler with the updated dates
    blockUpdateHandler(block.data, {
      start_date: renderFormattedPayloadDate(updatedStartDate) ?? undefined,
      target_date: renderFormattedPayloadDate(updatedTargetDate) ?? undefined,
    });
  };

  return (
    <div
      className="h-full"
      style={{
        width: `${itemsContainerWidth}px`,
        transform: `translateY(${HEADER_HEIGHT}px)`,
      }}
    >
      {blocks?.map((block) => {
        // hide the block if it doesn't have start and target dates and showAllBlocks is false
        if (!showAllBlocks && !(block.start_date && block.target_date)) return;

        const isBlockVisibleOnChart = block.start_date && block.target_date;

        return (
          <div
            key={`block-${block.id}`}
            className="relative min-w-full w-max"
            style={{
              height: `${BLOCK_HEIGHT}px`,
            }}
          >
            <div
              className={cn("relative h-full", {
                "bg-custom-background-80": activeBlock?.id === block.id,
                "rounded-l border border-r-0 border-custom-primary-70 hover:border-custom-primary-70":
                  peekIssue?.issueId === block.data.id,
              })}
              onMouseEnter={() => updateActiveBlock(block)}
              onMouseLeave={() => updateActiveBlock(null)}
            >
              {isBlockVisibleOnChart ? (
                <ChartDraggable
                  block={block}
                  blockToRender={blockToRender}
                  handleBlock={(...args) => handleChartBlockPosition(block, ...args)}
                  enableBlockLeftResize={enableBlockLeftResize}
                  enableBlockRightResize={enableBlockRightResize}
                  enableBlockMove={enableBlockMove}
                />
              ) : (
                enableAddBlock && <ChartAddBlock block={block} blockUpdateHandler={blockUpdateHandler} />
              )}
            </div>
          </div>
        );
      })}
    </div>
  );
});