import React, { MouseEventHandler, useCallback, useEffect, useMemo, useState } from 'react';
import {
  Box,
  Text,
  Button,
  Icon,
  Icons,
  IconButton,
  Avatar,
  AvatarImage,
  AvatarFallback,
  config,
  Spinner,
  Menu,
  RectCords,
  PopOut,
  Checkbox,
  toRem,
  Scroll,
  Header,
  Line,
  Chip,
} from 'folds';
import FocusTrap from 'focus-trap-react';
import { useAtomValue } from 'jotai';
import { Room } from 'matrix-js-sdk';
import { useGlobalImagePacks, useRoomsImagePacks } from '../../../hooks/useImagePacks';
import { SequenceCardStyle } from '../styles.css';
import { SequenceCard } from '../../../components/sequence-card';
import { SettingTile } from '../../../components/setting-tile';
import { mxcUrlToHttp } from '../../../utils/matrix';
import { useMediaAuthentication } from '../../../hooks/useMediaAuthentication';
import { useMatrixClient } from '../../../hooks/useMatrixClient';
import {
  EmoteRoomsContent,
  ImagePack,
  ImageUsage,
  PackAddress,
  packAddressEqual,
} from '../../../plugins/custom-emoji';
import { LineClamp2 } from '../../../styles/Text.css';
import { allRoomsAtom } from '../../../state/room-list/roomList';
import { AccountDataEvent } from '../../../../types/matrix/accountData';
import { AsyncStatus, useAsyncCallback } from '../../../hooks/useAsyncCallback';
import { stopPropagation } from '../../../utils/keyboard';

function GlobalPackSelector({
  packs,
  useAuthentication,
  onSelect,
}: {
  packs: ImagePack[];
  useAuthentication: boolean;
  onSelect: (addresses: PackAddress[]) => void;
}) {
  const mx = useMatrixClient();
  const roomToPacks = useMemo(() => {
    const rToP = new Map<string, ImagePack[]>();
    packs
      .filter((pack) => !pack.deleted)
      .forEach((pack) => {
        if (!pack.address) return;
        const pks = rToP.get(pack.address.roomId) ?? [];
        pks.push(pack);
        rToP.set(pack.address.roomId, pks);
      });
    return rToP;
  }, [packs]);

  const [selected, setSelected] = useState<PackAddress[]>([]);
  const toggleSelect = (address: PackAddress) => {
    setSelected((addresses) => {
      const newAddresses = addresses.filter((addr) => !packAddressEqual(addr, address));
      if (newAddresses.length !== addresses.length) {
        return newAddresses;
      }
      newAddresses.push(address);
      return newAddresses;
    });
  };

  const hasSelected = selected.length > 0;
  return (
    <Box grow="Yes" direction="Column">
      <Header size="400" variant="Surface" style={{ padding: `0 ${config.space.S300}` }}>
        <Box grow="Yes">
          <Text size="L400" truncate>
            Room Packs
          </Text>
        </Box>
        <Box shrink="No">
          <Chip
            radii="Pill"
            variant={hasSelected ? 'Success' : 'SurfaceVariant'}
            outlined={hasSelected}
            onClick={() => onSelect(selected)}
          >
            <Text size="B300">{hasSelected ? 'Save' : 'Close'}</Text>
          </Chip>
        </Box>
      </Header>
      <Line variant="Surface" size="300" />
      <Box grow="Yes">
        <Scroll size="300" hideTrack visibility="Hover">
          <Box
            direction="Column"
            gap="400"
            style={{
              paddingLeft: config.space.S300,
              paddingTop: config.space.S300,
              paddingBottom: config.space.S300,
              paddingRight: config.space.S100,
            }}
          >
            {Array.from(roomToPacks.entries()).map(([roomId, roomPacks]) => {
              const room = mx.getRoom(roomId);
              if (!room) return null;
              return (
                <Box key={roomId} direction="Column" gap="100">
                  <Text size="L400">{room.name}</Text>
                  {roomPacks.map((pack) => {
                    const avatarMxc = pack.getAvatarUrl(ImageUsage.Emoticon);
                    const avatarUrl = avatarMxc
                      ? mxcUrlToHttp(mx, avatarMxc, useAuthentication)
                      : undefined;
                    const { address } = pack;
                    if (!address) return null;

                    const added = selected.find((addr) => packAddressEqual(addr, address));
                    return (
                      <SequenceCard
                        key={pack.id}
                        className={SequenceCardStyle}
                        variant={added ? 'Success' : 'SurfaceVariant'}
                        direction="Column"
                        gap="400"
                      >
                        <SettingTile
                          title={pack.meta.name ?? 'Unknown'}
                          description={<span className={LineClamp2}>{pack.meta.attribution}</span>}
                          before={
                            <Box alignItems="Center" gap="300">
                              <Avatar size="300" radii="300">
                                {avatarUrl ? (
                                  <AvatarImage style={{ objectFit: 'contain' }} src={avatarUrl} />
                                ) : (
                                  <AvatarFallback>
                                    <Icon size="400" src={Icons.Sticker} filled />
                                  </AvatarFallback>
                                )}
                              </Avatar>
                            </Box>
                          }
                          after={
                            <Checkbox variant="Success" onClick={() => toggleSelect(address)} />
                          }
                        />
                      </SequenceCard>
                    );
                  })}
                </Box>
              );
            })}

            {roomToPacks.size === 0 && (
              <SequenceCard
                className={SequenceCardStyle}
                variant="SurfaceVariant"
                direction="Column"
                gap="400"
              >
                <Box
                  justifyContent="Center"
                  direction="Column"
                  gap="200"
                  style={{
                    padding: `${config.space.S700} ${config.space.S400}`,
                    maxWidth: toRem(300),
                    margin: 'auto',
                  }}
                >
                  <Text size="H5" align="Center">
                    No Packs
                  </Text>
                  <Text size="T200" align="Center">
                    Pack from rooms will appear here. You do not have any room with packs yet.
                  </Text>
                </Box>
              </SequenceCard>
            )}
          </Box>
        </Scroll>
      </Box>
    </Box>
  );
}

type GlobalPacksProps = {
  onViewPack: (imagePack: ImagePack) => void;
};
export function GlobalPacks({ onViewPack }: GlobalPacksProps) {
  const mx = useMatrixClient();
  const useAuthentication = useMediaAuthentication();
  const globalPacks = useGlobalImagePacks();
  const [menuCords, setMenuCords] = useState<RectCords>();

  const roomIds = useAtomValue(allRoomsAtom);
  const rooms = useMemo(() => {
    const rs: Room[] = [];
    roomIds.forEach((rId) => {
      const r = mx.getRoom(rId);
      if (r) rs.push(r);
    });
    return rs;
  }, [mx, roomIds]);
  const roomsImagePack = useRoomsImagePacks(rooms);
  const nonGlobalPacks = useMemo(
    () =>
      roomsImagePack.filter(
        (pack) => !globalPacks.find((p) => packAddressEqual(pack.address, p.address))
      ),
    [roomsImagePack, globalPacks]
  );

  const [selectedPacks, setSelectedPacks] = useState<PackAddress[]>([]);
  const [removedPacks, setRemovedPacks] = useState<PackAddress[]>([]);

  const unselectedGlobalPacks = useMemo(
    () =>
      nonGlobalPacks.filter(
        (pack) => !selectedPacks.find((addr) => packAddressEqual(pack.address, addr))
      ),
    [selectedPacks, nonGlobalPacks]
  );

  const handleRemove = (address: PackAddress) => {
    setRemovedPacks((addresses) => [...addresses, address]);
  };

  const handleUndoRemove = (address: PackAddress) => {
    setRemovedPacks((addresses) => addresses.filter((addr) => !packAddressEqual(addr, address)));
  };

  const handleSelected = (addresses: PackAddress[]) => {
    setMenuCords(undefined);
    if (addresses.length > 0) {
      setSelectedPacks((a) => [...addresses, ...a]);
    }
  };

  const [applyState, applyChanges] = useAsyncCallback(
    useCallback(async () => {
      const content =
        mx.getAccountData(AccountDataEvent.PoniesEmoteRooms)?.getContent<EmoteRoomsContent>() ?? {};
      const updatedContent: EmoteRoomsContent = JSON.parse(JSON.stringify(content));

      selectedPacks.forEach((addr) => {
        const roomsToState = updatedContent.rooms ?? {};
        const stateKeyToObj = roomsToState[addr.roomId] ?? {};
        stateKeyToObj[addr.stateKey] = {};
        roomsToState[addr.roomId] = stateKeyToObj;
        updatedContent.rooms = roomsToState;
      });

      removedPacks.forEach((addr) => {
        if (updatedContent.rooms?.[addr.roomId]?.[addr.stateKey]) {
          delete updatedContent.rooms?.[addr.roomId][addr.stateKey];
        }
      });

      await mx.setAccountData(AccountDataEvent.PoniesEmoteRooms, updatedContent);
    }, [mx, selectedPacks, removedPacks])
  );

  const resetChanges = useCallback(() => {
    setSelectedPacks([]);
    setRemovedPacks([]);
  }, []);

  useEffect(() => {
    if (applyState.status === AsyncStatus.Success) {
      resetChanges();
    }
  }, [applyState, resetChanges]);

  const handleSelectMenu: MouseEventHandler<HTMLButtonElement> = (evt) => {
    setMenuCords(evt.currentTarget.getBoundingClientRect());
  };

  const applyingChanges = applyState.status === AsyncStatus.Loading;
  const hasChanges = removedPacks.length > 0 || selectedPacks.length > 0;

  const renderPack = (pack: ImagePack) => {
    const avatarMxc = pack.getAvatarUrl(ImageUsage.Emoticon);
    const avatarUrl = avatarMxc ? mxcUrlToHttp(mx, avatarMxc, useAuthentication) : undefined;
    const { address } = pack;
    if (!address) return null;
    const removed = !!removedPacks.find((addr) => packAddressEqual(addr, address));

    return (
      <SequenceCard
        key={pack.id}
        className={SequenceCardStyle}
        variant={removed ? 'Critical' : 'SurfaceVariant'}
        direction="Column"
        gap="400"
      >
        <SettingTile
          title={
            <span style={{ textDecoration: removed ? 'line-through' : undefined }}>
              {pack.meta.name ?? 'Unknown'}
            </span>
          }
          description={<span className={LineClamp2}>{pack.meta.attribution}</span>}
          before={
            <Box alignItems="Center" gap="300">
              {removed ? (
                <IconButton
                  size="300"
                  radii="Pill"
                  variant="Critical"
                  onClick={() => handleUndoRemove(address)}
                  disabled={applyingChanges}
                >
                  <Icon src={Icons.Plus} size="100" />
                </IconButton>
              ) : (
                <IconButton
                  size="300"
                  radii="Pill"
                  variant="Secondary"
                  onClick={() => handleRemove(address)}
                  disabled={applyingChanges}
                >
                  <Icon src={Icons.Cross} size="100" />
                </IconButton>
              )}
              <Avatar size="300" radii="300">
                {avatarUrl ? (
                  <AvatarImage style={{ objectFit: 'contain' }} src={avatarUrl} />
                ) : (
                  <AvatarFallback>
                    <Icon size="400" src={Icons.Sticker} filled />
                  </AvatarFallback>
                )}
              </Avatar>
            </Box>
          }
          after={
            !removed && (
              <Button
                variant="Secondary"
                fill="Soft"
                size="300"
                radii="300"
                outlined
                onClick={() => onViewPack(pack)}
              >
                <Text size="B300">View</Text>
              </Button>
            )
          }
        />
      </SequenceCard>
    );
  };

  return (
    <>
      <Box direction="Column" gap="100">
        <Text size="L400">Favorite Packs</Text>
        <SequenceCard
          className={SequenceCardStyle}
          variant="SurfaceVariant"
          direction="Column"
          gap="400"
        >
          <SettingTile
            title="Select Pack"
            description="Pick emojis and stickers pack from rooms to use in all rooms."
            after={
              <>
                <Button
                  onClick={handleSelectMenu}
                  variant="Secondary"
                  fill="Soft"
                  size="300"
                  radii="300"
                  outlined
                >
                  <Text size="B300">Select</Text>
                </Button>
                <PopOut
                  anchor={menuCords}
                  position="Bottom"
                  align="End"
                  content={
                    <FocusTrap
                      focusTrapOptions={{
                        initialFocus: false,
                        onDeactivate: () => setMenuCords(undefined),
                        clickOutsideDeactivates: true,
                        isKeyForward: (evt: KeyboardEvent) =>
                          evt.key === 'ArrowDown' || evt.key === 'ArrowRight',
                        isKeyBackward: (evt: KeyboardEvent) =>
                          evt.key === 'ArrowUp' || evt.key === 'ArrowLeft',
                        escapeDeactivates: stopPropagation,
                      }}
                    >
                      <Menu
                        style={{
                          display: 'flex',
                          maxWidth: toRem(400),
                          width: '100vw',
                          maxHeight: toRem(500),
                        }}
                      >
                        <GlobalPackSelector
                          packs={unselectedGlobalPacks}
                          useAuthentication={useAuthentication}
                          onSelect={handleSelected}
                        />
                      </Menu>
                    </FocusTrap>
                  }
                />
              </>
            }
          />
        </SequenceCard>
        {globalPacks.map(renderPack)}
        {nonGlobalPacks
          .filter((pack) => !!selectedPacks.find((addr) => packAddressEqual(pack.address, addr)))
          .map(renderPack)}
      </Box>
      {hasChanges && (
        <Menu
          style={{
            position: 'sticky',
            padding: config.space.S200,
            paddingLeft: config.space.S400,
            bottom: config.space.S400,
            left: config.space.S400,
            right: 0,
            zIndex: 1,
          }}
          variant="Success"
        >
          <Box alignItems="Center" gap="400">
            <Box grow="Yes" direction="Column">
              {applyState.status === AsyncStatus.Error ? (
                <Text size="T200">
                  <b>Failed to apply changes! Please try again.</b>
                </Text>
              ) : (
                <Text size="T200">
                  <b>Changes saved! Apply when ready.</b>
                </Text>
              )}
            </Box>
            <Box shrink="No" gap="200">
              <Button
                size="300"
                variant="Success"
                fill="None"
                radii="300"
                disabled={applyingChanges}
                onClick={resetChanges}
              >
                <Text size="B300">Reset</Text>
              </Button>
              <Button
                size="300"
                variant="Success"
                radii="300"
                disabled={applyingChanges}
                before={applyingChanges && <Spinner variant="Success" fill="Solid" size="100" />}
                onClick={applyChanges}
              >
                <Text size="B300">Apply Changes</Text>
              </Button>
            </Box>
          </Box>
        </Menu>
      )}
    </>
  );
}
