import React, {
  ChangeEventHandler,
  FormEventHandler,
  Suspense,
  useCallback,
  useEffect,
  useMemo,
  useRef,
  useState,
} from 'react';
import {
  Box,
  Text,
  IconButton,
  Icon,
  Icons,
  Input,
  Avatar,
  Button,
  Overlay,
  OverlayBackdrop,
  OverlayCenter,
  Modal,
  Dialog,
  Header,
  config,
  Spinner,
  PopOut,
  RectCords,
} from 'folds';
import FocusTrap from 'focus-trap-react';
import { SequenceCard } from '../../../components/sequence-card';
import { SequenceCardStyle } from '../styles.css';
import { SettingTile } from '../../../components/setting-tile';
import { useMatrixClient } from '../../../hooks/useMatrixClient';
import { UserProfile, useUserProfile } from '../../../hooks/useUserProfile';
import { getMxIdLocalPart, mxcUrlToHttp } from '../../../utils/matrix';
import { UserAvatar } from '../../../components/user-avatar';
import { useMediaAuthentication } from '../../../hooks/useMediaAuthentication';
import { nameInitials } from '../../../utils/common';
import { AsyncStatus, useAsyncCallback } from '../../../hooks/useAsyncCallback';
import { useFilePicker } from '../../../hooks/useFilePicker';
import { useObjectURL } from '../../../hooks/useObjectURL';
import { stopPropagation } from '../../../utils/keyboard';
import { ImageEditor } from '../../../components/image-editor';
import { ModalWide } from '../../../styles/Modal.css';
import { createUploadAtom, UploadSuccess } from '../../../state/upload';
import { CompactUploadCardRenderer } from '../../../components/upload-card';
import { useCapabilities } from '../../../hooks/useCapabilities';
import { useUserPresence } from '../../../hooks/useUserPresence';

const EmojiBoard = React.lazy(() =>
  import('../../../components/emoji-board').then((m) => ({ default: m.EmojiBoard })),
);

type ProfileProps = {
  profile: UserProfile;
  userId: string;
};
function ProfileAvatar({ profile, userId }: ProfileProps) {
  const mx = useMatrixClient();
  const useAuthentication = useMediaAuthentication();
  const capabilities = useCapabilities();
  const [alertRemove, setAlertRemove] = useState(false);
  const disableSetAvatar = capabilities['m.set_avatar_url']?.enabled === false;

  const defaultDisplayName = profile.displayName ?? getMxIdLocalPart(userId) ?? userId;
  const avatarUrl = profile.avatarUrl
    ? (mxcUrlToHttp(mx, profile.avatarUrl, useAuthentication, 96, 96, 'crop') ?? undefined)
    : undefined;

  const [imageFile, setImageFile] = useState<File>();
  const imageFileURL = useObjectURL(imageFile);
  const uploadAtom = useMemo(() => {
    if (imageFile) return createUploadAtom(imageFile);
    return undefined;
  }, [imageFile]);

  const pickFile = useFilePicker(setImageFile, false);

  const handleRemoveUpload = useCallback(() => {
    setImageFile(undefined);
  }, []);

  const handleUploaded = useCallback(
    (upload: UploadSuccess) => {
      const { mxc } = upload;
      mx.setAvatarUrl(mxc);
      handleRemoveUpload();
    },
    [mx, handleRemoveUpload],
  );

  const handleRemoveAvatar = () => {
    mx.setAvatarUrl('');
    setAlertRemove(false);
  };

  return (
    <SettingTile
      title={
        <Text as="span" size="L400">
          Avatar
        </Text>
      }
      after={
        <Avatar size="500" radii="300">
          <UserAvatar
            userId={userId}
            src={avatarUrl}
            renderFallback={() => <Text size="H4">{nameInitials(defaultDisplayName)}</Text>}
          />
        </Avatar>
      }
    >
      {uploadAtom ? (
        <Box gap="200" direction="Column">
          <CompactUploadCardRenderer
            uploadAtom={uploadAtom}
            onRemove={handleRemoveUpload}
            onComplete={handleUploaded}
          />
        </Box>
      ) : (
        <Box gap="200">
          <Button
            onClick={() => pickFile('image/*')}
            size="300"
            variant="Secondary"
            fill="Soft"
            outlined
            radii="300"
            disabled={disableSetAvatar}
          >
            <Text size="B300">Upload</Text>
          </Button>
          {avatarUrl && (
            <Button
              size="300"
              variant="Critical"
              fill="None"
              radii="300"
              disabled={disableSetAvatar}
              onClick={() => setAlertRemove(true)}
            >
              <Text size="B300">Remove</Text>
            </Button>
          )}
        </Box>
      )}

      {imageFileURL && (
        <Overlay open={false} backdrop={<OverlayBackdrop />}>
          <OverlayCenter>
            <FocusTrap
              focusTrapOptions={{
                initialFocus: false,
                onDeactivate: handleRemoveUpload,
                clickOutsideDeactivates: true,
                escapeDeactivates: stopPropagation,
              }}
            >
              <Modal className={ModalWide} variant="Surface" size="500">
                <ImageEditor
                  name={imageFile?.name ?? 'Unnamed'}
                  url={imageFileURL}
                  requestClose={handleRemoveUpload}
                />
              </Modal>
            </FocusTrap>
          </OverlayCenter>
        </Overlay>
      )}

      <Overlay open={alertRemove} backdrop={<OverlayBackdrop />}>
        <OverlayCenter>
          <FocusTrap
            focusTrapOptions={{
              initialFocus: false,
              onDeactivate: () => setAlertRemove(false),
              clickOutsideDeactivates: true,
              escapeDeactivates: stopPropagation,
            }}
          >
            <Dialog variant="Surface">
              <Header
                style={{
                  padding: `0 ${config.space.S200} 0 ${config.space.S400}`,
                  borderBottomWidth: config.borderWidth.B300,
                }}
                variant="Surface"
                size="500"
              >
                <Box grow="Yes">
                  <Text size="H4">Remove Avatar</Text>
                </Box>
                <IconButton
                  size="300"
                  onClick={() => setAlertRemove(false)}
                  radii="300"
                  aria-label="Cancel"
                >
                  <Icon src={Icons.Cross} />
                </IconButton>
              </Header>
              <Box style={{ padding: config.space.S400 }} direction="Column" gap="400">
                <Box direction="Column" gap="200">
                  <Text priority="400">Are you sure you want to remove profile avatar?</Text>
                </Box>
                <Button variant="Critical" onClick={handleRemoveAvatar}>
                  <Text size="B400">Remove</Text>
                </Button>
              </Box>
            </Dialog>
          </FocusTrap>
        </OverlayCenter>
      </Overlay>
    </SettingTile>
  );
}

function ProfileDisplayName({ profile, userId }: ProfileProps) {
  const mx = useMatrixClient();
  const capabilities = useCapabilities();
  const disableSetDisplayname = capabilities['m.set_displayname']?.enabled === false;

  const defaultDisplayName = profile.displayName ?? getMxIdLocalPart(userId) ?? userId;
  const [displayName, setDisplayName] = useState<string>(defaultDisplayName);

  const [changeState, changeDisplayName] = useAsyncCallback(
    useCallback((name: string) => mx.setDisplayName(name), [mx]),
  );
  const changingDisplayName = changeState.status === AsyncStatus.Loading;

  useEffect(() => {
    setDisplayName(defaultDisplayName);
  }, [defaultDisplayName]);

  const handleChange: ChangeEventHandler<HTMLInputElement> = (evt) => {
    const name = evt.currentTarget.value;
    setDisplayName(name);
  };

  const handleReset = () => {
    setDisplayName(defaultDisplayName);
  };

  const handleSubmit: FormEventHandler<HTMLFormElement> = (evt) => {
    evt.preventDefault();
    if (changingDisplayName) return;

    const target = evt.target as HTMLFormElement | undefined;
    const displayNameInput = target?.displayNameInput as HTMLInputElement | undefined;
    const name = displayNameInput?.value;
    if (!name) return;

    changeDisplayName(name);
  };

  const hasChanges = displayName !== defaultDisplayName;
  return (
    <SettingTile
      title={
        <Text as="span" size="L400">
          Display Name
        </Text>
      }
    >
      <Box direction="Column" grow="Yes" gap="100">
        <Box
          as="form"
          onSubmit={handleSubmit}
          gap="200"
          aria-disabled={changingDisplayName || disableSetDisplayname}
        >
          <Box grow="Yes" direction="Column">
            <Input
              required
              name="displayNameInput"
              aria-label="Display name"
              value={displayName}
              onChange={handleChange}
              variant="Secondary"
              radii="300"
              style={{ paddingRight: config.space.S200 }}
              readOnly={changingDisplayName || disableSetDisplayname}
              after={
                hasChanges &&
                !changingDisplayName && (
                  <IconButton
                    type="reset"
                    onClick={handleReset}
                    size="300"
                    radii="300"
                    variant="Secondary"
                    aria-label="Reset display name"
                  >
                    <Icon src={Icons.Cross} size="100" />
                  </IconButton>
                )
              }
            />
          </Box>
          <Button
            size="400"
            variant={hasChanges ? 'Success' : 'Secondary'}
            fill={hasChanges ? 'Solid' : 'Soft'}
            outlined
            radii="300"
            disabled={!hasChanges || changingDisplayName}
            type="submit"
          >
            {changingDisplayName && <Spinner variant="Success" fill="Solid" size="300" />}
            <Text size="B400">Save</Text>
          </Button>
        </Box>
      </Box>
    </SettingTile>
  );
}

const STATUS_EXPIRY_KEY = (id: string) => `lotus-status-expiry-${id}`;

const CLEAR_AFTER_OPTIONS = [
  { label: 'Never', value: '0' },
  { label: '30 minutes', value: String(30 * 60 * 1000) },
  { label: '1 hour', value: String(60 * 60 * 1000) },
  { label: '4 hours', value: String(4 * 60 * 60 * 1000) },
  { label: '8 hours', value: String(8 * 60 * 60 * 1000) },
  { label: 'Until midnight', value: 'today' },
  { label: '1 day', value: String(24 * 60 * 60 * 1000) },
  { label: '7 days', value: String(7 * 24 * 60 * 60 * 1000) },
];

function getMsFromOption(value: string): number {
  if (value === '0') return 0;
  if (value === 'today') {
    const eod = new Date();
    eod.setHours(23, 59, 59, 999);
    return eod.getTime() - Date.now();
  }
  return parseInt(value, 10);
}

function ProfileStatus() {
  const mx = useMatrixClient();
  const userId = mx.getUserId()!;
  const presence = useUserPresence(userId);

  const [statusMsg, setStatusMsg] = useState<string>(presence?.status ?? '');
  const [clearAfter, setClearAfter] = useState('0');
  const [emojiAnchor, setEmojiAnchor] = useState<RectCords>();
  const inputRef = useRef<HTMLInputElement>(null);

  // Initialise expiry from localStorage so timer survives page reload
  const [expiryTs, setExpiryTs] = useState<number>(() => {
    const stored = localStorage.getItem(STATUS_EXPIRY_KEY(userId));
    return stored ? parseInt(stored, 10) : 0;
  });

  // Sync input when another device changes the status
  useEffect(() => {
    setStatusMsg(presence?.status ?? '');
  }, [presence?.status]);

  // Drive the auto-clear timer off expiryTs so re-saving cancels the old timer
  useEffect(() => {
    if (!expiryTs) return undefined;
    const remaining = expiryTs - Date.now();
    if (remaining <= 0) {
      localStorage.removeItem(STATUS_EXPIRY_KEY(userId));
      setExpiryTs(0);
      mx.setPresence({ presence: 'online', status_msg: '' });
      return undefined;
    }
    const timer = window.setTimeout(() => {
      localStorage.removeItem(STATUS_EXPIRY_KEY(userId));
      setExpiryTs(0);
      mx.setPresence({ presence: 'online', status_msg: '' });
    }, remaining);
    return () => clearTimeout(timer);
  }, [expiryTs, userId, mx]);

  const [saveState, saveStatus] = useAsyncCallback(
    useCallback(
      (msg: string) =>
        mx.setPresence({
          presence: 'online',
          status_msg: msg,
        }),
      [mx],
    ),
  );
  const saving = saveState.status === AsyncStatus.Loading;

  const handleEmojiSelect = useCallback(
    (unicode: string) => {
      const input = inputRef.current;
      if (input) {
        const start = input.selectionStart ?? statusMsg.length;
        const end = input.selectionEnd ?? statusMsg.length;
        const next = statusMsg.slice(0, start) + unicode + statusMsg.slice(end);
        setStatusMsg(next);
        requestAnimationFrame(() => {
          input.focus();
          input.setSelectionRange(start + unicode.length, start + unicode.length);
        });
      } else {
        setStatusMsg((prev) => prev + unicode);
      }
      setEmojiAnchor(undefined);
    },
    [statusMsg],
  );

  const handleChange: ChangeEventHandler<HTMLInputElement> = (evt) => {
    setStatusMsg(evt.currentTarget.value);
  };

  const handleSubmit: FormEventHandler<HTMLFormElement> = (evt) => {
    evt.preventDefault();
    if (saving) return;
    const msg = statusMsg.trim();
    saveStatus(msg);

    const delayMs = getMsFromOption(clearAfter);
    if (msg && delayMs > 0) {
      const ts = Date.now() + delayMs;
      localStorage.setItem(STATUS_EXPIRY_KEY(userId), String(ts));
      setExpiryTs(ts);
    } else {
      localStorage.removeItem(STATUS_EXPIRY_KEY(userId));
      setExpiryTs(0);
    }
  };

  const handleClear = () => {
    setStatusMsg('');
    localStorage.removeItem(STATUS_EXPIRY_KEY(userId));
    setExpiryTs(0);
    mx.setPresence({ presence: 'online', status_msg: '' });
  };

  const hasChanges = statusMsg !== (presence?.status ?? '');

  return (
    <SettingTile
      title={
        <Text as="span" size="L400">
          Status Message
        </Text>
      }
      description={
        <Text size="T200" priority="300">
          Shown below your name in member lists. Supports emoji.
        </Text>
      }
    >
      <Box direction="Column" grow="Yes" gap="100">
        <Box as="form" onSubmit={handleSubmit} gap="200" aria-disabled={saving}>
          <Box grow="Yes" direction="Column">
            <Input
              ref={inputRef}
              name="statusMsgInput"
              aria-label="Status message"
              value={statusMsg}
              onChange={handleChange}
              placeholder="What's on your mind?"
              variant="Secondary"
              radii="300"
              style={{ paddingRight: config.space.S200 }}
              readOnly={saving}
              after={
                <PopOut
                  anchor={emojiAnchor}
                  position="Top"
                  align="End"
                  content={
                    <Suspense fallback={<Spinner size="100" />}>
                      <EmojiBoard
                        imagePackRooms={[]}
                        returnFocusOnDeactivate={false}
                        onEmojiSelect={handleEmojiSelect}
                        requestClose={() => setEmojiAnchor(undefined)}
                      />
                    </Suspense>
                  }
                >
                  <IconButton
                    type="button"
                    size="300"
                    radii="300"
                    variant="Secondary"
                    aria-label="Insert emoji"
                    aria-expanded={!!emojiAnchor}
                    aria-haspopup="dialog"
                    onClick={(evt: React.MouseEvent<HTMLButtonElement>) => {
                      const rect = evt.currentTarget.getBoundingClientRect();
                      setEmojiAnchor((prev) => (prev ? undefined : rect));
                    }}
                  >
                    <Icon src={Icons.Smile} size="100" />
                  </IconButton>
                </PopOut>
              }
            />
          </Box>
          <Button
            size="400"
            variant={hasChanges ? 'Success' : 'Secondary'}
            fill={hasChanges ? 'Solid' : 'Soft'}
            outlined
            radii="300"
            disabled={!hasChanges || saving}
            type="submit"
          >
            {saving && <Spinner variant="Success" fill="Solid" size="300" />}
            <Text size="B400">Save</Text>
          </Button>
        </Box>
        <Box alignItems="Center" gap="200">
          <Text size="T200" style={{ opacity: 0.6, whiteSpace: 'nowrap', flexShrink: 0 }}>
            Auto-clear after:
          </Text>
          <select
            value={clearAfter}
            onChange={(e) => setClearAfter(e.target.value)}
            aria-label="Auto-clear status after"
            style={{
              background: 'var(--bg-surface-variant)',
              border: `1px solid var(--border-surface-variant)`,
              borderRadius: config.radii.R300,
              color: 'inherit',
              fontSize: '0.82rem',
              padding: `${config.space.S100} ${config.space.S200}`,
              cursor: 'pointer',
              outline: 'none',
            }}
          >
            {CLEAR_AFTER_OPTIONS.map((opt) => (
              <option key={opt.value} value={opt.value}>
                {opt.label}
              </option>
            ))}
          </select>
        </Box>
        {(presence?.status || statusMsg) && (
          <Button
            size="300"
            variant="Critical"
            fill="None"
            radii="300"
            type="button"
            onClick={handleClear}
            disabled={saving}
          >
            <Text size="B300">Clear Status</Text>
          </Button>
        )}
      </Box>
    </SettingTile>
  );
}

export function Profile() {
  const mx = useMatrixClient();
  const userId = mx.getUserId()!;
  const profile = useUserProfile(userId);

  return (
    <Box direction="Column" gap="100">
      <Text size="L400">Profile</Text>
      <SequenceCard
        className={SequenceCardStyle}
        variant="SurfaceVariant"
        direction="Column"
        gap="400"
      >
        <ProfileAvatar userId={userId} profile={profile} />
        <ProfileDisplayName userId={userId} profile={profile} />
        <ProfileStatus />
      </SequenceCard>
    </Box>
  );
}