import * as React from "react";
import { useRef, useState } from "react";
import { Typography, Box, TextField, ClickAwayListener, Fade, InputAdornment, styled, IconButton, Popper } from "@mui/material";
import { Close } from "@mui/icons-material";
import { useTranslation } from "react-i18next";
import { splitNoEmpty } from "../app/utils";
import { rawEmojis } from "../app/emojis";

// Create emoji list by category and create a search base (string with all search words)
//
// This also filters emojis that are not supported by Desktop Chrome.
// This is a hack, but on Ubuntu 18.04, with Chrome 99, only Emoji <= 11 are supported.

const emojisByCategory = {};
const isDesktopChrome = /Chrome/.test(navigator.userAgent) && !/Mobile/.test(navigator.userAgent);
const maxSupportedVersionForDesktopChrome = 11;
rawEmojis.forEach((emoji) => {
  if (!emojisByCategory[emoji.category]) {
    emojisByCategory[emoji.category] = [];
  }
  try {
    const unicodeVersion = parseFloat(emoji.unicode_version);
    const supportedEmoji = unicodeVersion <= maxSupportedVersionForDesktopChrome || !isDesktopChrome;
    if (supportedEmoji) {
      const searchBase = `${emoji.description.toLowerCase()} ${emoji.aliases.join(" ")} ${emoji.tags.join(" ")}`;
      const emojiWithSearchBase = { ...emoji, searchBase };
      emojisByCategory[emoji.category].push(emojiWithSearchBase);
    }
  } catch (e) {
    // Nothing. Ignore.
  }
});

const EmojiPicker = (props) => {
  const { t } = useTranslation();
  const open = Boolean(props.anchorEl);
  const [search, setSearch] = useState("");
  const searchRef = useRef(null);
  const searchFields = splitNoEmpty(search.toLowerCase(), " ");

  const handleSearchClear = () => {
    setSearch("");
    searchRef.current?.focus();
  };

  return (
    <Popper open={open} anchorEl={props.anchorEl} placement="bottom-start" sx={{ zIndex: 10005 }} transition>
      {({ TransitionProps }) => (
        <ClickAwayListener onClickAway={props.onClose}>
          <Fade {...TransitionProps} timeout={350}>
            <Box
              sx={{
                boxShadow: 3,
                padding: 2,
                paddingRight: 0,
                paddingBottom: 1,
                width: "380px",
                maxHeight: "300px",
                backgroundColor: "background.paper",
                overflowY: "scroll",
              }}
            >
              <TextField
                inputRef={searchRef}
                margin="dense"
                size="small"
                placeholder={t("emoji_picker_search_placeholder")}
                value={search}
                onChange={(ev) => setSearch(ev.target.value)}
                type="text"
                variant="standard"
                fullWidth
                sx={{ marginTop: 0, marginBottom: "12px", paddingRight: 2 }}
                inputProps={{
                  role: "searchbox",
                  "aria-label": t("emoji_picker_search_placeholder"),
                }}
                InputProps={{
                  endAdornment: (
                    <InputAdornment position="end" sx={{ display: search ? "" : "none" }}>
                      <IconButton size="small" onClick={handleSearchClear} edge="end" aria-label={t("emoji_picker_search_clear")}>
                        <Close />
                      </IconButton>
                    </InputAdornment>
                  ),
                }}
              />
              <Box
                sx={{
                  display: "flex",
                  flexWrap: "wrap",
                  paddingRight: 0,
                  marginTop: 1,
                }}
              >
                {Object.keys(emojisByCategory).map((category) => (
                  <Category
                    key={category}
                    title={category}
                    emojis={emojisByCategory[category]}
                    search={searchFields}
                    onPick={props.onEmojiPick}
                  />
                ))}
              </Box>
            </Box>
          </Fade>
        </ClickAwayListener>
      )}
    </Popper>
  );
};

const Category = (props) => {
  const showTitle = props.search.length === 0;
  return (
    <>
      {showTitle && (
        <Typography variant="body1" sx={{ width: "100%", marginBottom: 1 }}>
          {props.title}
        </Typography>
      )}
      {props.emojis.map((emoji) => (
        <Emoji key={emoji.aliases[0]} emoji={emoji} search={props.search} onClick={() => props.onPick(emoji.aliases[0])} />
      ))}
    </>
  );
};

const emojiMatches = (emoji, words) => words.length === 0 || words.some((word) => emoji.searchBase.includes(word));

const Emoji = (props) => {
  const { emoji } = props;
  const matches = emojiMatches(emoji, props.search);
  const title = `${emoji.description} (${emoji.aliases[0]})`;
  return (
    <EmojiDiv onClick={props.onClick} title={title} aria-label={title} style={{ display: matches ? "" : "none" }}>
      {props.emoji.emoji}
    </EmojiDiv>
  );
};

const EmojiDiv = styled("div")({
  fontSize: "30px",
  width: "30px",
  height: "30px",
  marginTop: "8px",
  marginBottom: "8px",
  marginRight: "8px",
  lineHeight: "30px",
  cursor: "pointer",
  opacity: 0.85,
  "&:hover": {
    opacity: 1,
  },
});

export default EmojiPicker;