import React, { useEffect, useRef, useMemo, useState, Fragment } from "react";
import styles from "./home.module.scss";
import DragIcon from "../icons/drag.svg";
import faviconSrc from "../icons/favicon.png";
import deepSeekSrc from "../icons/deepSeek.png";
import { MenuOutlined, PlusOutlined } from '@ant-design/icons';
import { useAppConfig, useChatStore, useGlobalStore } from "../store";
import {
  DEFAULT_SIDEBAR_WIDTH,
  MAX_SIDEBAR_WIDTH,
  MIN_SIDEBAR_WIDTH,
  NARROW_SIDEBAR_WIDTH,
} from "../constant";
import { useLocation, useNavigate } from "react-router-dom";
import { isIOS, useMobileScreen } from "../utils";
import { Button } from "antd";

export function useHotKey() {
  const chatStore = useChatStore();

  useEffect(() => {
    const onKeyDown = (e: KeyboardEvent) => {
      if (e.altKey || e.ctrlKey) {
        if (e.key === "ArrowUp") {
          chatStore.nextSession(-1);
        } else if (e.key === "ArrowDown") {
          chatStore.nextSession(1);
        }
      }
    };

    window.addEventListener("keydown", onKeyDown);
    return () => window.removeEventListener("keydown", onKeyDown);
  });
}

export function useDragSideBar() {
  const limit = (x: number) => Math.min(MAX_SIDEBAR_WIDTH, x);

  const config = useAppConfig();
  const startX = useRef(0);
  const startDragWidth = useRef(config.sidebarWidth ?? DEFAULT_SIDEBAR_WIDTH);
  const lastUpdateTime = useRef(Date.now());

  const toggleSideBar = () => {
    config.update((config) => {
      if (config.sidebarWidth < MIN_SIDEBAR_WIDTH) {
        config.sidebarWidth = DEFAULT_SIDEBAR_WIDTH;
      } else {
        config.sidebarWidth = NARROW_SIDEBAR_WIDTH;
      }
    });
  };

  const onDragStart = (e: MouseEvent) => {
    // Remembers the initial width each time the mouse is pressed
    startX.current = e.clientX;
    startDragWidth.current = config.sidebarWidth;
    const dragStartTime = Date.now();

    const handleDragMove = (e: MouseEvent) => {
      if (Date.now() < lastUpdateTime.current + 20) {
        return;
      }
      lastUpdateTime.current = Date.now();
      const d = e.clientX - startX.current;
      const nextWidth = limit(startDragWidth.current + d);
      config.update((config) => {
        if (nextWidth < MIN_SIDEBAR_WIDTH) {
          config.sidebarWidth = NARROW_SIDEBAR_WIDTH;
        } else {
          config.sidebarWidth = nextWidth;
        }
      });
    };

    const handleDragEnd = () => {
      // In useRef the data is non-responsive, so `config.sidebarWidth` can't get the dynamic sidebarWidth
      window.removeEventListener("pointermove", handleDragMove);
      window.removeEventListener("pointerup", handleDragEnd);

      // if user click the drag icon, should toggle the sidebar
      const shouldFireClick = Date.now() - dragStartTime < 300;
      if (shouldFireClick) {
        toggleSideBar();
      }
    };

    window.addEventListener("pointermove", handleDragMove);
    window.addEventListener("pointerup", handleDragEnd);
  };

  const isMobileScreen = useMobileScreen();
  const shouldNarrow =
    !isMobileScreen && config.sidebarWidth < MIN_SIDEBAR_WIDTH;

  useEffect(() => {
    const barWidth = shouldNarrow
      ? NARROW_SIDEBAR_WIDTH
      : limit(config.sidebarWidth ?? DEFAULT_SIDEBAR_WIDTH);
    const sideBarWidth = isMobileScreen ? "60vw" : `${barWidth}px`;
    document.documentElement.style.setProperty("--sidebar-width", sideBarWidth);
  }, [config.sidebarWidth, isMobileScreen, shouldNarrow]);

  return {
    onDragStart,
    shouldNarrow,
  };
}
export function SideBarContainer(props: {
  children: React.ReactNode;
  onDragStart: (e: MouseEvent) => void;
  shouldNarrow: boolean;
  className?: string;
}) {
  const isMobileScreen = useMobileScreen();
  const isIOSMobile = useMemo(
    () => isIOS() && isMobileScreen,
    [isMobileScreen],
  );
  const { children, className, onDragStart, shouldNarrow } = props;
  return (
    <div
      className={`${styles.sidebar} ${className} ${shouldNarrow && styles["narrow-sidebar"]
        }`}
      style={{
        transition: isMobileScreen && isIOSMobile ? "none" : undefined,
        background: '#FFFFFF',
        overflowY: "auto",
      }}
    >
      {children}
      <div
        className={styles["sidebar-drag"]}
        onPointerDown={(e) => onDragStart(e as any)}
      >
        <DragIcon />
      </div>
    </div>
  );
}

export function SideBarHeader(props: {
  title?: string | React.ReactNode;
  subTitle?: string | React.ReactNode;
  logo?: React.ReactNode;
  children?: React.ReactNode;
}) {
  const { title, subTitle, logo, children } = props;
  return (
    <Fragment>
      <div className={styles["sidebar-header"]} data-tauri-drag-region>
        <div className={styles["sidebar-title-container"]}>
          <div className={styles["sidebar-title"]} data-tauri-drag-region>
            {title}
          </div>
          <div className={styles["sidebar-sub-title"]}>{subTitle}</div>
        </div>
        <div className={styles["sidebar-logo"] + " no-dark"}>{logo}</div>
      </div>
      {children}
    </Fragment>
  );
}

export function SideBarBody(props: {
  children: React.ReactNode;
  onClick?: (e: React.MouseEvent<HTMLDivElement, MouseEvent>) => void;
}) {
  const { onClick, children } = props;
  return (
    <div className={styles["sidebar-body"]} onClick={onClick}>
      {children}
    </div>
  );
}

export function SideBarTail(props: {
  primaryAction?: React.ReactNode;
  secondaryAction?: React.ReactNode;
}) {
  const { primaryAction, secondaryAction } = props;

  return (
    <div className={styles["sidebar-tail"]}>
      <div className={styles["sidebar-actions"]}>{primaryAction}</div>
      <div className={styles["sidebar-actions"]}>{secondaryAction}</div>
    </div>
  );
}

export const SideBar = (props: { className?: string }) => {
  const { onDragStart, shouldNarrow } = useDragSideBar();
  const navigate = useNavigate();
  const location = useLocation();
  const chatStore = useChatStore();
  const globalStore = useGlobalStore();
  const isMobileScreen = useMobileScreen();

  const getType = (): 'bigModel' | 'deepSeek' => {
    if (['/knowledgeChat', '/newChat'].includes(location.pathname)) {
      return 'bigModel';
    } else if (['/deepseekChat', '/newDeepseekChat'].includes(location.pathname)) {
      return 'deepSeek';
    } else {
      return 'bigModel';
    }
  }

  const closeSidebar = () => {
    globalStore.setShowMenu(false);
  };

  return (
    <>
      {
        isMobileScreen && globalStore.showMenu && (
          <div
            className={styles["sidebar-overlay"]}
            onClick={closeSidebar}
          />
        )
      }
      {
        (location.search.includes('showMenu=false') ? globalStore.showMenu : true) &&
        <SideBarContainer
          onDragStart={onDragStart}
          shouldNarrow={shouldNarrow}
          {...props}
        >
          {
            getType() === 'deepSeek' &&
            <div>
              <img style={{ width: '100%' }} src={deepSeekSrc.src} />
            </div>
          }
          <SideBarHeader
            title={getType() === 'bigModel' ?
              <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
                <img style={{ height: 32 }} src={faviconSrc.src} />
                <span>建科•小智</span>
              </div>
              :
              ''
            }
            logo={getType() === 'bigModel' ? null : ''}
          >
            <div style={{ marginTop: 20 }}>
              <Button
                style={{ width: '100%' }}
                type="primary"
                icon={<PlusOutlined />}
                onClick={async () => {
                  chatStore.clearSessions();
                  chatStore.updateCurrentSession((value) => {
                    value.appId = globalStore.selectedAppId;
                  });
                  if (isMobileScreen) {
                    closeSidebar();
                  }
                  if (getType() === 'bigModel') {
                    navigate({ pathname: '/newChat' });
                  } else {
                    navigate({ pathname: '/newDeepseekChat' });
                  }
                }}
              >
                新建对话
              </Button>
            </div>
          </SideBarHeader>
        </SideBarContainer>
      }
    </>
  );
}