import React, { FC, useCallback, useRef, useState } from "react";
import clsx from "clsx";
import {
  createStyles,
  makeStyles,
  useTheme,
  Theme,
} from "@material-ui/core/styles";
import Drawer from "@material-ui/core/Drawer";
import AppBar from "@material-ui/core/AppBar";
import Toolbar from "@material-ui/core/Toolbar";
import CssBaseline from "@material-ui/core/CssBaseline";
import Typography from "@material-ui/core/Typography";
import Divider from "@material-ui/core/Divider";
import IconButton from "@material-ui/core/IconButton";
import MenuIcon from "@material-ui/icons/Menu";
import ChevronLeftIcon from "@material-ui/icons/ChevronLeft";
import ChevronRightIcon from "@material-ui/icons/ChevronRight";
import { ProjectPanel } from "../projects/project-panel";
import { HeaderContainerProvider } from "./header-container";
const drawerWidth = 240;

const useStyles = makeStyles((theme: Theme) =>
  createStyles({
    root: {
      display: "flex",
      overflow: "hidden",
    },
    appBar: {
      zIndex: theme.zIndex.drawer + 1,
      transition: theme.transitions.create(["width", "margin"], {
        easing: theme.transitions.easing.sharp,
        duration: theme.transitions.duration.leavingScreen,
      }),
    },
    appBarShift: {
      marginLeft: drawerWidth,
      width: `calc(100% - ${drawerWidth}px)`,
      transition: theme.transitions.create(["width", "margin"], {
        easing: theme.transitions.easing.sharp,
        duration: theme.transitions.duration.enteringScreen,
      }),
    },
    menuButton: {
      marginRight: 36,
    },
    hide: {
      display: "none",
    },
    drawer: {
      width: drawerWidth,
      flexShrink: 0,
      whiteSpace: "nowrap",
    },
    drawerOpen: {
      width: drawerWidth,
      transition: theme.transitions.create("width", {
        easing: theme.transitions.easing.sharp,
        duration: theme.transitions.duration.enteringScreen,
      }),
    },
    drawerClose: {
      transition: theme.transitions.create("width", {
        easing: theme.transitions.easing.sharp,
        duration: theme.transitions.duration.leavingScreen,
      }),
      overflowX: "hidden",
      width: 0,
    },
    toolbar: {
      display: "flex",
      alignItems: "center",
      justifyContent: "flex-end",
      padding: theme.spacing(0, 1),
      flex: "none",
      // necessary for content to be below app bar
      ...theme.mixins.toolbar,
    },
    headerContaner: {
      flex: "auto",
    },
    content: {
      flexGrow: 1,
      height: "100vh",
      display: "flex",
      flexFlow: "column",
      padding: theme.spacing(0),
    },
  })
);

export const DefaultLayout: FC = ({ children }) => {
  const classes = useStyles();
  const theme = useTheme();
  const [open, setOpen] = React.useState(true);

  const handleDrawerOpen = () => {
    setOpen(true);
  };

  const handleDrawerClose = () => {
    setOpen(false);
  };

  const [headerContainer, setHeaderContainer] = useState(undefined);
  const onRefChange = useCallback(
    (node) => {
      setHeaderContainer(node);
    },
    [setHeaderContainer]
  );

  return (
    <div className={classes.root}>
      <CssBaseline />
      <AppBar
        position="fixed"
        className={clsx(classes.appBar, {
          [classes.appBarShift]: open,
        })}
      >
        <Toolbar>
          <IconButton
            color="inherit"
            aria-label="open drawer"
            onClick={handleDrawerOpen}
            edge="start"
            className={clsx(classes.menuButton, {
              [classes.hide]: open,
            })}
          >
            <MenuIcon />
          </IconButton>
          <div className={classes.headerContaner} ref={onRefChange}></div>
        </Toolbar>
      </AppBar>
      <Drawer
        variant="permanent"
        className={clsx(classes.drawer, {
          [classes.drawerOpen]: open,
          [classes.drawerClose]: !open,
        })}
        classes={{
          paper: clsx({
            [classes.drawerOpen]: open,
            [classes.drawerClose]: !open,
          }),
        }}
      >
        <div className={classes.toolbar}>
          <IconButton onClick={handleDrawerClose}>
            {theme.direction === "rtl" ? (
              <ChevronRightIcon />
            ) : (
              <ChevronLeftIcon />
            )}
          </IconButton>
        </div>
        <Divider />
        <ProjectPanel />
        <Divider />
      </Drawer>
      <main className={classes.content}>
        <div className={classes.toolbar} />

        <HeaderContainerProvider value={headerContainer}>
          {children}
        </HeaderContainerProvider>
      </main>
    </div>
  );
};