import * as React from "react";
import { useContext, useEffect, useState } from "react";
import {
  Alert,
  CardActions,
  CardContent,
  Chip,
  FormControl,
  Select,
  Stack,
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableRow,
  Tooltip,
  useMediaQuery,
  Typography,
  IconButton,
  Container,
  TextField,
  MenuItem,
  Card,
  Button,
  Dialog,
  DialogTitle,
  DialogContent,
  DialogActions,
} from "@mui/material";
import EditIcon from "@mui/icons-material/Edit";
import CloseIcon from "@mui/icons-material/Close";
import PlayArrowIcon from "@mui/icons-material/PlayArrow";
import { useLiveQuery } from "dexie-react-hooks";
import { useTranslation } from "react-i18next";
import { Info } from "@mui/icons-material";
import { useOutletContext } from "react-router-dom";
import theme from "./theme";
import userManager from "../app/UserManager";
import { playSound, shuffle, sounds, validUrl } from "../app/utils";
import session from "../app/Session";
import routes from "./routes";
import accountApi, { Permission, Role } from "../app/AccountApi";
import { Pref, PrefGroup } from "./Pref";
import { AccountContext } from "./App";
import { Paragraph } from "./styles";
import prefs from "../app/Prefs";
import { PermissionDenyAll, PermissionRead, PermissionReadWrite, PermissionWrite } from "./ReserveIcons";
import { ReserveAddDialog, ReserveDeleteDialog, ReserveEditDialog } from "./ReserveDialogs";
import { UnauthorizedError } from "../app/errors";
import { subscribeTopic } from "./SubscribeDialog";

const maybeUpdateAccountSettings = async (payload) => {
  if (!session.exists()) {
    return;
  }
  try {
    await accountApi.updateSettings(payload);
  } catch (e) {
    console.log(`[Preferences] Error updating account settings`, e);
    if (e instanceof UnauthorizedError) {
      session.resetAndRedirect(routes.login);
    }
  }
};

const Preferences = () => (
  <Container maxWidth="md" sx={{ marginTop: 3, marginBottom: 3 }}>
    <Stack spacing={3}>
      <Notifications />
      <Reservations />
      <Users />
      <Appearance />
    </Stack>
  </Container>
);

const Notifications = () => {
  const { t } = useTranslation();
  return (
    <Card sx={{ p: 3 }} aria-label={t("prefs_notifications_title")}>
      <Typography variant="h5" sx={{ marginBottom: 2 }}>
        {t("prefs_notifications_title")}
      </Typography>
      <PrefGroup>
        <Sound />
        <MinPriority />
        <DeleteAfter />
      </PrefGroup>
    </Card>
  );
};

const Sound = () => {
  const { t } = useTranslation();
  const labelId = "prefSound";
  const sound = useLiveQuery(async () => prefs.sound());
  const handleChange = async (ev) => {
    await prefs.setSound(ev.target.value);
    await maybeUpdateAccountSettings({
      notification: {
        sound: ev.target.value,
      },
    });
  };
  if (!sound) {
    return null; // While loading
  }
  let description;
  if (sound === "none") {
    description = t("prefs_notifications_sound_description_none");
  } else {
    description = t("prefs_notifications_sound_description_some", {
      sound: sounds[sound].label,
    });
  }
  return (
    <Pref labelId={labelId} title={t("prefs_notifications_sound_title")} description={description}>
      <div style={{ display: "flex", width: "100%" }}>
        <FormControl fullWidth variant="standard" sx={{ margin: 1 }}>
          <Select value={sound} onChange={handleChange} aria-labelledby={labelId}>
            <MenuItem value="none">{t("prefs_notifications_sound_no_sound")}</MenuItem>
            {Object.entries(sounds).map((s) => (
              <MenuItem key={s[0]} value={s[0]}>
                {s[1].label}
              </MenuItem>
            ))}
          </Select>
        </FormControl>
        <IconButton onClick={() => playSound(sound)} disabled={sound === "none"} aria-label={t("prefs_notifications_sound_play")}>
          <PlayArrowIcon />
        </IconButton>
      </div>
    </Pref>
  );
};

const MinPriority = () => {
  const { t } = useTranslation();
  const labelId = "prefMinPriority";
  const minPriority = useLiveQuery(async () => prefs.minPriority());
  const handleChange = async (ev) => {
    await prefs.setMinPriority(ev.target.value);
    await maybeUpdateAccountSettings({
      notification: {
        min_priority: ev.target.value,
      },
    });
  };
  if (!minPriority) {
    return null; // While loading
  }
  const priorities = {
    1: t("priority_min"),
    2: t("priority_low"),
    3: t("priority_default"),
    4: t("priority_high"),
    5: t("priority_max"),
  };
  let description;
  if (minPriority === 1) {
    description = t("prefs_notifications_min_priority_description_any");
  } else if (minPriority === 5) {
    description = t("prefs_notifications_min_priority_description_max");
  } else {
    description = t("prefs_notifications_min_priority_description_x_or_higher", {
      number: minPriority,
      name: priorities[minPriority],
    });
  }
  return (
    <Pref labelId={labelId} title={t("prefs_notifications_min_priority_title")} description={description}>
      <FormControl fullWidth variant="standard" sx={{ m: 1 }}>
        <Select value={minPriority} onChange={handleChange} aria-labelledby={labelId}>
          <MenuItem value={1}>{t("prefs_notifications_min_priority_any")}</MenuItem>
          <MenuItem value={2}>{t("prefs_notifications_min_priority_low_and_higher")}</MenuItem>
          <MenuItem value={3}>{t("prefs_notifications_min_priority_default_and_higher")}</MenuItem>
          <MenuItem value={4}>{t("prefs_notifications_min_priority_high_and_higher")}</MenuItem>
          <MenuItem value={5}>{t("prefs_notifications_min_priority_max_only")}</MenuItem>
        </Select>
      </FormControl>
    </Pref>
  );
};

const DeleteAfter = () => {
  const { t } = useTranslation();
  const labelId = "prefDeleteAfter";
  const deleteAfter = useLiveQuery(async () => prefs.deleteAfter());
  const handleChange = async (ev) => {
    await prefs.setDeleteAfter(ev.target.value);
    await maybeUpdateAccountSettings({
      notification: {
        delete_after: ev.target.value,
      },
    });
  };

  if (deleteAfter === null || deleteAfter === undefined) {
    // !deleteAfter will not work with "0"
    return null; // While loading
  }

  const description = (() => {
    switch (deleteAfter) {
      case 0:
        return t("prefs_notifications_delete_after_never_description");
      case 10800:
        return t("prefs_notifications_delete_after_three_hours_description");
      case 86400:
        return t("prefs_notifications_delete_after_one_day_description");
      case 604800:
        return t("prefs_notifications_delete_after_one_week_description");
      case 2592000:
        return t("prefs_notifications_delete_after_one_month_description");
      default:
        return "";
    }
  })();

  return (
    <Pref labelId={labelId} title={t("prefs_notifications_delete_after_title")} description={description}>
      <FormControl fullWidth variant="standard" sx={{ m: 1 }}>
        <Select value={deleteAfter} onChange={handleChange} aria-labelledby={labelId}>
          <MenuItem value={0}>{t("prefs_notifications_delete_after_never")}</MenuItem>
          <MenuItem value={10800}>{t("prefs_notifications_delete_after_three_hours")}</MenuItem>
          <MenuItem value={86400}>{t("prefs_notifications_delete_after_one_day")}</MenuItem>
          <MenuItem value={604800}>{t("prefs_notifications_delete_after_one_week")}</MenuItem>
          <MenuItem value={2592000}>{t("prefs_notifications_delete_after_one_month")}</MenuItem>
        </Select>
      </FormControl>
    </Pref>
  );
};

const Users = () => {
  const { t } = useTranslation();
  const [dialogKey, setDialogKey] = useState(0);
  const [dialogOpen, setDialogOpen] = useState(false);
  const users = useLiveQuery(() => userManager.all());
  const handleAddClick = () => {
    setDialogKey((prev) => prev + 1);
    setDialogOpen(true);
  };
  const handleDialogCancel = () => {
    setDialogOpen(false);
  };
  const handleDialogSubmit = async (user) => {
    setDialogOpen(false);
    try {
      await userManager.save(user);
      console.debug(`[Preferences] User ${user.username} for ${user.baseUrl} added`);
    } catch (e) {
      console.log(`[Preferences] Error adding user.`, e);
    }
  };
  return (
    <Card sx={{ padding: 1 }} aria-label={t("prefs_users_title")}>
      <CardContent sx={{ paddingBottom: 1 }}>
        <Typography variant="h5" sx={{ marginBottom: 2 }}>
          {t("prefs_users_title")}
        </Typography>
        <Paragraph>
          {t("prefs_users_description")}
          {session.exists() && <>{` ${t("prefs_users_description_no_sync")}`}</>}
        </Paragraph>
        {users?.length > 0 && <UserTable users={users} />}
      </CardContent>
      <CardActions>
        <Button onClick={handleAddClick}>{t("prefs_users_add_button")}</Button>
        <UserDialog
          key={`userAddDialog${dialogKey}`}
          open={dialogOpen}
          user={null}
          users={users}
          onCancel={handleDialogCancel}
          onSubmit={handleDialogSubmit}
        />
      </CardActions>
    </Card>
  );
};

const UserTable = (props) => {
  const { t } = useTranslation();
  const [dialogKey, setDialogKey] = useState(0);
  const [dialogOpen, setDialogOpen] = useState(false);
  const [dialogUser, setDialogUser] = useState(null);

  const handleEditClick = (user) => {
    setDialogKey((prev) => prev + 1);
    setDialogUser(user);
    setDialogOpen(true);
  };

  const handleDialogCancel = () => {
    setDialogOpen(false);
  };

  const handleDialogSubmit = async (user) => {
    setDialogOpen(false);
    try {
      await userManager.save(user);
      console.debug(`[Preferences] User ${user.username} for ${user.baseUrl} updated`);
    } catch (e) {
      console.log(`[Preferences] Error updating user.`, e);
    }
  };

  const handleDeleteClick = async (user) => {
    try {
      await userManager.delete(user.baseUrl);
      console.debug(`[Preferences] User ${user.username} for ${user.baseUrl} deleted`);
    } catch (e) {
      console.error(`[Preferences] Error deleting user for ${user.baseUrl}`, e);
    }
  };

  return (
    <Table size="small" aria-label={t("prefs_users_table")}>
      <TableHead>
        <TableRow>
          <TableCell sx={{ paddingLeft: 0 }}>{t("prefs_users_table_user_header")}</TableCell>
          <TableCell>{t("prefs_users_table_base_url_header")}</TableCell>
          <TableCell />
        </TableRow>
      </TableHead>
      <TableBody>
        {props.users?.map((user) => (
          <TableRow key={user.baseUrl} sx={{ "&:last-child td, &:last-child th": { border: 0 } }}>
            <TableCell component="th" scope="row" sx={{ paddingLeft: 0 }} aria-label={t("prefs_users_table_user_header")}>
              {user.username}
            </TableCell>
            <TableCell aria-label={t("prefs_users_table_base_url_header")}>{user.baseUrl}</TableCell>
            <TableCell align="right" sx={{ whiteSpace: "nowrap" }}>
              {(!session.exists() || user.baseUrl !== config.base_url) && (
                <>
                  <IconButton onClick={() => handleEditClick(user)} aria-label={t("prefs_users_edit_button")}>
                    <EditIcon />
                  </IconButton>
                  <IconButton onClick={() => handleDeleteClick(user)} aria-label={t("prefs_users_delete_button")}>
                    <CloseIcon />
                  </IconButton>
                </>
              )}
              {session.exists() && user.baseUrl === config.base_url && (
                <Tooltip title={t("prefs_users_table_cannot_delete_or_edit")}>
                  <span>
                    <IconButton disabled>
                      <EditIcon />
                    </IconButton>
                    <IconButton disabled>
                      <CloseIcon />
                    </IconButton>
                  </span>
                </Tooltip>
              )}
            </TableCell>
          </TableRow>
        ))}
      </TableBody>
      <UserDialog
        key={`userEditDialog${dialogKey}`}
        open={dialogOpen}
        user={dialogUser}
        users={props.users}
        onCancel={handleDialogCancel}
        onSubmit={handleDialogSubmit}
      />
    </Table>
  );
};

const UserDialog = (props) => {
  const { t } = useTranslation();
  const [baseUrl, setBaseUrl] = useState("");
  const [username, setUsername] = useState("");
  const [password, setPassword] = useState("");
  const fullScreen = useMediaQuery(theme.breakpoints.down("sm"));
  const editMode = props.user !== null;
  const addButtonEnabled = (() => {
    if (editMode) {
      return username.length > 0 && password.length > 0;
    }
    const baseUrlValid = validUrl(baseUrl);
    const baseUrlExists = props.users?.map((user) => user.baseUrl).includes(baseUrl);
    return baseUrlValid && !baseUrlExists && username.length > 0 && password.length > 0;
  })();
  const handleSubmit = async () => {
    props.onSubmit({
      baseUrl,
      username,
      password,
    });
  };
  useEffect(() => {
    if (editMode) {
      setBaseUrl(props.user.baseUrl);
      setUsername(props.user.username);
      setPassword(props.user.password);
    }
  }, [editMode, props.user]);
  return (
    <Dialog open={props.open} onClose={props.onCancel} fullScreen={fullScreen}>
      <DialogTitle>{editMode ? t("prefs_users_dialog_title_edit") : t("prefs_users_dialog_title_add")}</DialogTitle>
      <DialogContent>
        {!editMode && (
          <TextField
            autoFocus
            margin="dense"
            id="baseUrl"
            label={t("prefs_users_dialog_base_url_label")}
            aria-label={t("prefs_users_dialog_base_url_label")}
            value={baseUrl}
            onChange={(ev) => setBaseUrl(ev.target.value)}
            type="url"
            fullWidth
            variant="standard"
          />
        )}
        <TextField
          autoFocus={editMode}
          margin="dense"
          id="username"
          label={t("prefs_users_dialog_username_label")}
          aria-label={t("prefs_users_dialog_username_label")}
          value={username}
          onChange={(ev) => setUsername(ev.target.value)}
          type="text"
          fullWidth
          variant="standard"
        />
        <TextField
          margin="dense"
          id="password"
          label={t("prefs_users_dialog_password_label")}
          aria-label={t("prefs_users_dialog_password_label")}
          type="password"
          value={password}
          onChange={(ev) => setPassword(ev.target.value)}
          fullWidth
          variant="standard"
        />
      </DialogContent>
      <DialogActions>
        <Button onClick={props.onCancel}>{t("common_cancel")}</Button>
        <Button onClick={handleSubmit} disabled={!addButtonEnabled}>
          {editMode ? t("common_save") : t("common_add")}
        </Button>
      </DialogActions>
    </Dialog>
  );
};

const Appearance = () => {
  const { t } = useTranslation();
  return (
    <Card sx={{ p: 3 }} aria-label={t("prefs_appearance_title")}>
      <Typography variant="h5" sx={{ marginBottom: 2 }}>
        {t("prefs_appearance_title")}
      </Typography>
      <PrefGroup>
        <Language />
      </PrefGroup>
    </Card>
  );
};

const Language = () => {
  const { t, i18n } = useTranslation();
  const labelId = "prefLanguage";
  const lang = i18n.resolvedLanguage ?? "en";

  // Country flags are displayed using emoji. Emoji rendering is handled by platform fonts.
  // Windows in particular does not yet play nicely with flag emoji so for now, hide flags on Windows.
  const randomFlags = shuffle([
    "🇬🇧",
    "🇺🇸",
    "🇪🇸",
    "🇫🇷",
    "🇧🇬",
    "🇨🇿",
    "🇩🇪",
    "🇵🇱",
    "🇺🇦",
    "🇨🇳",
    "🇮🇹",
    "🇭🇺",
    "🇧🇷",
    "🇳🇱",
    "🇮🇩",
    "🇯🇵",
    "🇷🇺",
    "🇹🇷",
  ]).slice(0, 3);
  const showFlags = !navigator.userAgent.includes("Windows");
  let title = t("prefs_appearance_language_title");
  if (showFlags) {
    title += ` ${randomFlags.join(" ")}`;
  }

  const handleChange = async (ev) => {
    await i18n.changeLanguage(ev.target.value);
    await maybeUpdateAccountSettings({
      language: ev.target.value,
    });
  };

  // Remember: Flags are not languages. Don't put flags next to the language in the list.
  // Languages names from: https://www.omniglot.com/language/names.htm
  // Better: Sidebar in Wikipedia: https://en.wikipedia.org/wiki/Bokm%C3%A5l

  return (
    <Pref labelId={labelId} title={title}>
      <FormControl fullWidth variant="standard" sx={{ m: 1 }}>
        <Select value={lang} onChange={handleChange} aria-labelledby={labelId}>
          <MenuItem value="en">English</MenuItem>
          <MenuItem value="ar">العربية</MenuItem>
          <MenuItem value="id">Bahasa Indonesia</MenuItem>
          <MenuItem value="bg">Български</MenuItem>
          <MenuItem value="cs">Čeština</MenuItem>
          <MenuItem value="zh_Hans">中文</MenuItem>
          <MenuItem value="da">Dansk</MenuItem>
          <MenuItem value="de">Deutsch</MenuItem>
          <MenuItem value="es">Español</MenuItem>
          <MenuItem value="fr">Français</MenuItem>
          <MenuItem value="it">Italiano</MenuItem>
          <MenuItem value="hu">Magyar</MenuItem>
          <MenuItem value="ko">한국어</MenuItem>
          <MenuItem value="ja">日本語</MenuItem>
          <MenuItem value="nl">Nederlands</MenuItem>
          <MenuItem value="nb_NO">Norsk bokmål</MenuItem>
          <MenuItem value="uk">Українська</MenuItem>
          <MenuItem value="pt">Português</MenuItem>
          <MenuItem value="pt_BR">Português (Brasil)</MenuItem>
          <MenuItem value="pl">Polski</MenuItem>
          <MenuItem value="ru">Русский</MenuItem>
          <MenuItem value="sv">Svenska</MenuItem>
          <MenuItem value="tr">Türkçe</MenuItem>
        </Select>
      </FormControl>
    </Pref>
  );
};

const Reservations = () => {
  const { t } = useTranslation();
  const { account } = useContext(AccountContext);
  const [dialogKey, setDialogKey] = useState(0);
  const [dialogOpen, setDialogOpen] = useState(false);

  if (!config.enable_reservations || !session.exists() || !account) {
    return <></>;
  }
  const reservations = account.reservations || [];
  const limitReached = account.role === Role.USER && account.stats.reservations_remaining === 0;

  const handleAddClick = () => {
    setDialogKey((prev) => prev + 1);
    setDialogOpen(true);
  };

  return (
    <Card sx={{ padding: 1 }} aria-label={t("prefs_reservations_title")}>
      <CardContent sx={{ paddingBottom: 1 }}>
        <Typography variant="h5" sx={{ marginBottom: 2 }}>
          {t("prefs_reservations_title")}
        </Typography>
        <Paragraph>{t("prefs_reservations_description")}</Paragraph>
        {reservations.length > 0 && <ReservationsTable reservations={reservations} />}
        {limitReached && <Alert severity="info">{t("prefs_reservations_limit_reached")}</Alert>}
      </CardContent>
      <CardActions>
        <Button onClick={handleAddClick} disabled={limitReached}>
          {t("prefs_reservations_add_button")}
        </Button>
        <ReserveAddDialog
          key={`reservationAddDialog${dialogKey}`}
          open={dialogOpen}
          reservations={reservations}
          onClose={() => setDialogOpen(false)}
        />
      </CardActions>
    </Card>
  );
};

const ReservationsTable = (props) => {
  const { t } = useTranslation();
  const [dialogKey, setDialogKey] = useState(0);
  const [dialogReservation, setDialogReservation] = useState(null);
  const [editDialogOpen, setEditDialogOpen] = useState(false);
  const [deleteDialogOpen, setDeleteDialogOpen] = useState(false);
  const { subscriptions } = useOutletContext();
  const localSubscriptions =
    subscriptions?.length > 0
      ? Object.assign({}, ...subscriptions.filter((s) => s.baseUrl === config.base_url).map((s) => ({ [s.topic]: s })))
      : {};

  const handleEditClick = (reservation) => {
    setDialogKey((prev) => prev + 1);
    setDialogReservation(reservation);
    setEditDialogOpen(true);
  };

  const handleDeleteClick = async (reservation) => {
    setDialogKey((prev) => prev + 1);
    setDialogReservation(reservation);
    setDeleteDialogOpen(true);
  };

  const handleSubscribeClick = async (reservation) => {
    await subscribeTopic(config.base_url, reservation.topic);
  };

  return (
    <Table size="small" aria-label={t("prefs_reservations_table")}>
      <TableHead>
        <TableRow>
          <TableCell sx={{ paddingLeft: 0 }}>{t("prefs_reservations_table_topic_header")}</TableCell>
          <TableCell>{t("prefs_reservations_table_access_header")}</TableCell>
          <TableCell />
        </TableRow>
      </TableHead>
      <TableBody>
        {props.reservations.map((reservation) => (
          <TableRow key={reservation.topic} sx={{ "&:last-child td, &:last-child th": { border: 0 } }}>
            <TableCell component="th" scope="row" sx={{ paddingLeft: 0 }} aria-label={t("prefs_reservations_table_topic_header")}>
              {reservation.topic}
            </TableCell>
            <TableCell aria-label={t("prefs_reservations_table_access_header")}>
              {reservation.everyone === Permission.READ_WRITE && (
                <>
                  <PermissionReadWrite size="small" sx={{ verticalAlign: "bottom", mr: 1.5 }} />
                  {t("prefs_reservations_table_everyone_read_write")}
                </>
              )}
              {reservation.everyone === Permission.READ_ONLY && (
                <>
                  <PermissionRead size="small" sx={{ verticalAlign: "bottom", mr: 1.5 }} />
                  {t("prefs_reservations_table_everyone_read_only")}
                </>
              )}
              {reservation.everyone === Permission.WRITE_ONLY && (
                <>
                  <PermissionWrite size="small" sx={{ verticalAlign: "bottom", mr: 1.5 }} />
                  {t("prefs_reservations_table_everyone_write_only")}
                </>
              )}
              {reservation.everyone === Permission.DENY_ALL && (
                <>
                  <PermissionDenyAll size="small" sx={{ verticalAlign: "bottom", mr: 1.5 }} />
                  {t("prefs_reservations_table_everyone_deny_all")}
                </>
              )}
            </TableCell>
            <TableCell align="right" sx={{ whiteSpace: "nowrap" }}>
              {!localSubscriptions[reservation.topic] && (
                <Tooltip title={t("prefs_reservations_table_click_to_subscribe")}>
                  <Chip
                    icon={<Info />}
                    onClick={() => handleSubscribeClick(reservation)}
                    label={t("prefs_reservations_table_not_subscribed")}
                    color="primary"
                    variant="outlined"
                  />
                </Tooltip>
              )}
              <IconButton onClick={() => handleEditClick(reservation)} aria-label={t("prefs_reservations_edit_button")}>
                <EditIcon />
              </IconButton>
              <IconButton onClick={() => handleDeleteClick(reservation)} aria-label={t("prefs_reservations_delete_button")}>
                <CloseIcon />
              </IconButton>
            </TableCell>
          </TableRow>
        ))}
      </TableBody>
      <ReserveEditDialog
        key={`reservationEditDialog${dialogKey}`}
        open={editDialogOpen}
        reservation={dialogReservation}
        reservations={props.reservations}
        onClose={() => setEditDialogOpen(false)}
      />
      <ReserveDeleteDialog
        key={`reservationDeleteDialog${dialogKey}`}
        open={deleteDialogOpen}
        topic={dialogReservation?.topic}
        onClose={() => setDeleteDialogOpen(false)}
      />
    </Table>
  );
};

export default Preferences;
