import React, { useState, SyntheticEvent } from "react";
import { ViewMode, GanttProps, Task } from "../../types/public-types";
import { GridProps } from "../grid/grid";
import { ganttDateRange, seedDates } from "../../helpers/date-helper";
import { CalendarProps } from "../calendar/calendar";
import { TaskGanttContentProps } from "./task-gantt-content";
import { TaskListHeaderDefault } from "../task-list/task-list-header";
import { TaskListTableDefault } from "../task-list/task-list-table";
import { StandardTooltipContent } from "../other/tooltip";
import { Scroll } from "../other/scroll";
import { TaskListProps, TaskList } from "../task-list/task-list";
import styles from "./gantt.module.css";
import { TaskGantt } from "./task-gantt";

export const Gantt: React.SFC<GanttProps> = ({
  tasks,
  headerHeight = 50,
  columnWidth = 60,
  listCellWidth = "150px",
  rowHeight = 50,
  ganttHeight = 0,
  viewMode = ViewMode.Day,
  locale = "en-GB",
  barFill = 60,
  barCornerRadius = 3,
  barProgressColor = "#a3a3ff",
  barProgressSelectedColor = "#8282f5",
  barBackgroundColor = "#b8c2cc",
  barBackgroundSelectedColor = "#aeb8c2",
  handleWidth = 8,
  timeStep = 300000,
  arrowColor = "grey",
  fontFamily = "Arial, Roboto, Oxygen, Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue",
  fontSize = "14px",
  arrowIndent = 20,
  todayColor = "rgba(252, 248, 227, 0.5)",
  TooltipContent = StandardTooltipContent,
  TaskListHeader = TaskListHeaderDefault,
  TaskListTable = TaskListTableDefault,
  onDateChange,
  onProgressChange,
  onDoubleClick,
  onTaskDelete,
}) => {
  const [ganttTasks, setGanttTasks] = useState<Task[]>(tasks);
  const [scrollY, setScrollY] = useState(0);

  const [startDate, endDate] = ganttDateRange(ganttTasks, viewMode);
  const dates = seedDates(startDate, endDate, viewMode);

  const svgHeight = rowHeight * tasks.length;
  const gridWidth = dates.length * columnWidth;
  const ganttFullHeight = ganttTasks.length * rowHeight;

  const onTasksDateChange = (tasks: Task[]) => {
    setGanttTasks(tasks);
  };

  const handleScroll = (event: SyntheticEvent<HTMLDivElement>) => {
    setScrollY(event.currentTarget.scrollTop);
  };

  const handleWheel = (event: React.WheelEvent<HTMLDivElement>) => {
    const newScrollY = scrollY + event.deltaY;
    if (newScrollY < 0) {
      setScrollY(0);
    } else if (newScrollY > ganttFullHeight - ganttHeight) {
      setScrollY(ganttFullHeight - ganttHeight);
    } else {
      setScrollY(scrollY + event.deltaY);
    }
  };

  const handleKeyDown = (event: React.KeyboardEvent<HTMLDivElement>) => {
    let newScrollY = 0;
    let isX = true;
    switch (event.key) {
      case "Down": // IE/Edge specific value
      case "ArrowDown":
        newScrollY = scrollY + rowHeight;
        isX = false;
        break;
      case "Up": // IE/Edge specific value
      case "ArrowUp":
        newScrollY = scrollY - rowHeight;
        isX = false;
        break;
      case "ArrowLeft":
        // Do something for "left arrow" key press.
        break;
      case "Right": // IE/Edge specific value
      case "ArrowRight":
        // Do something for "right arrow" key press.
        break;
    }
    if (isX) {
    } else {
      if (newScrollY < 0) {
        setScrollY(0);
      } else if (newScrollY > ganttFullHeight - ganttHeight) {
        setScrollY(ganttFullHeight - ganttHeight);
      } else {
        setScrollY(newScrollY);
      }
    }
  };

  const gridProps: GridProps = {
    columnWidth,
    gridWidth,
    tasks: ganttTasks,
    rowHeight,
    dates,
    todayColor,
  };
  const calendarProps: CalendarProps = {
    dates,
    locale,
    viewMode,
    headerHeight,
    columnWidth,
    fontFamily,
    fontSize,
  };
  const barProps: TaskGanttContentProps = {
    tasks: ganttTasks,
    rowHeight,
    barCornerRadius,
    columnWidth,
    dates,
    barFill,
    barProgressColor,
    barProgressSelectedColor,
    barBackgroundColor,
    barBackgroundSelectedColor,
    handleWidth,
    arrowColor,
    timeStep,
    fontFamily,
    fontSize,
    arrowIndent,
    svgHeight,
    onTasksDateChange: onTasksDateChange,
    onDateChange,
    onProgressChange,
    onDoubleClick,
    onTaskDelete,
    TooltipContent,
  };

  const tableProps: TaskListProps = {
    rowHeight,
    rowWidth: listCellWidth,
    fontFamily,
    fontSize,
    tasks: ganttTasks,
    locale,
    headerHeight,
    scrollY,
    ganttHeight,
    horizontalContainerClass: styles.horizontalContainer,
    TaskListHeader,
    TaskListTable,
  };

  return (
    <div
      className={styles.wrapper}
      onWheel={handleWheel}
      onKeyDown={handleKeyDown}
      tabIndex={0}
    >
      {listCellWidth && <TaskList {...tableProps} />}
      <TaskGantt
        gridProps={gridProps}
        calendarProps={calendarProps}
        barProps={barProps}
        ganttHeight={ganttHeight}
        scrollY={scrollY}
      />
      <Scroll
        ganttFullHeight={ganttFullHeight}
        ganttHeight={ganttHeight}
        headerHeight={headerHeight}
        scroll={scrollY}
        onScroll={handleScroll}
      />
    </div>
  );
};