import { useCallback, useEffect, useMemo, useState } from 'react';
import { useBlocker, useLocation } from 'react-router';
import { toast } from 'react-toastify';

import CancelIcon from '@mui/icons-material/Cancel';
import EditIcon from '@mui/icons-material/Edit';
import PowerSettingsNewIcon from '@mui/icons-material/PowerSettingsNew';
import SaveIcon from '@mui/icons-material/Save';
import SearchIcon from '@mui/icons-material/Search';
import SettingsBackupRestoreIcon from '@mui/icons-material/SettingsBackupRestore';
import WarningIcon from '@mui/icons-material/Warning';
import {
  Box,
  Button,
  Dialog,
  DialogActions,
  DialogContent,
  DialogTitle,
  Grid,
  InputAdornment,
  Link,
  MenuItem,
  TextField,
  ToggleButton,
  ToggleButtonGroup,
  Typography
} from '@mui/material';

import {
  Body,
  Cell,
  Header,
  HeaderCell,
  HeaderRow,
  Row,
  Table
} from '@table-library/react-table-library/table';
import { useTheme } from '@table-library/react-table-library/theme';
import { dialogStyle } from 'CustomTheme';
import { useRequest } from 'alova/client';
import SystemMonitor from 'app/status/SystemMonitor';
import {
  BlockNavigation,
  ButtonRow,
  MessageBox,
  SectionContent,
  useLayoutTitle
} from 'components';
import { useI18nContext } from 'i18n/i18n-react';

import {
  API,
  readCoreData,
  readDeviceEntities,
  resetCustomizations,
  writeCustomizationEntities,
  writeDeviceName
} from '../../api/app';
import SettingsCustomizationsDialog from './CustomizationsDialog';
import EntityMaskToggle from './EntityMaskToggle';
import OptionIcon from './OptionIcon';
import { DeviceEntityMask } from './types';
import type { APIcall, Device, DeviceEntity } from './types';

export const APIURL = `${window.location.origin}/api/`;

const MAX_BUFFER_SIZE = 2000;

// Helper function to create masked entity ID - extracted to avoid duplication
const createMaskedEntityId = (de: DeviceEntity): string => {
  const maskHex = de.m.toString(16).padStart(2, '0');
  const hasCustomizations = !!(de.cn || de.mi || de.ma);
  const customizations = [
    de.cn || '',
    de.mi ? `>${de.mi}` : '',
    de.ma ? `<${de.ma}` : ''
  ]
    .filter(Boolean)
    .join('');

  return `${maskHex}${de.id}${hasCustomizations ? `|${customizations}` : ''}`;
};

const Customizations = () => {
  const { LL } = useI18nContext();
  const [numChanges, setNumChanges] = useState<number>(0);
  const blocker = useBlocker(numChanges !== 0);

  const [restarting, setRestarting] = useState<boolean>(false);
  const [restartNeeded, setRestartNeeded] = useState<boolean>(false);
  const [deviceEntities, setDeviceEntities] = useState<DeviceEntity[]>([]);
  const [confirmReset, setConfirmReset] = useState<boolean>(false);
  const [selectedFilters, setSelectedFilters] = useState<number>(0);
  const [search, setSearch] = useState('');
  const [selectedDeviceEntity, setSelectedDeviceEntity] = useState<DeviceEntity>();
  const [dialogOpen, setDialogOpen] = useState<boolean>(false);
  const [rename, setRename] = useState<boolean>(false);

  useLayoutTitle(LL.CUSTOMIZATIONS());

  // fetch devices first from coreData
  const { data: devices, send: fetchCoreData } = useRequest(readCoreData);

  const { send: sendAPI } = useRequest((data: APIcall) => API(data), {
    immediate: false
  });

  const [selectedDevice, setSelectedDevice] = useState<number>(
    Number(useLocation().state) || -1
  );
  const [selectedDeviceTypeNameURL, setSelectedDeviceTypeNameURL] =
    useState<string>(''); // needed for API URL
  const [selectedDeviceName, setSelectedDeviceName] = useState<string>('');

  const { send: sendResetCustomizations } = useRequest(resetCustomizations(), {
    immediate: false
  });

  const { send: sendDeviceName } = useRequest(
    (data: { id: number; name: string }) => writeDeviceName(data),
    {
      immediate: false
    }
  );

  const { send: sendCustomizationEntities } = useRequest(
    (data: { id: number; entity_ids: string[] }) => writeCustomizationEntities(data),
    {
      immediate: false
    }
  );

  const { send: sendDeviceEntities } = useRequest(
    (data: number) => readDeviceEntities(data),
    {
      initialData: [],
      immediate: false
    }
  ).onSuccess((event) => {
    setOriginalSettings(event.data);
  });

  const setOriginalSettings = (data: DeviceEntity[]) => {
    setDeviceEntities(
      data.map((de) => {
        const result: DeviceEntity = {
          ...de,
          o_m: de.m
        };
        if (de.cn !== undefined) {
          result.o_cn = de.cn;
        }
        if (de.mi !== undefined) {
          result.o_mi = de.mi;
        }
        if (de.ma !== undefined) {
          result.o_ma = de.ma;
        }
        return result;
      })
    );
  };

  const doRestart = async () => {
    setRestarting(true);
    await sendAPI({ device: 'system', cmd: 'restart', id: 0 }).catch(
      (error: Error) => {
        toast.error(error.message);
      }
    );
  };

  const entities_theme = useMemo(
    () =>
      useTheme({
        Table: `
      --data-table-library_grid-template-columns: 156px repeat(1, minmax(80px, 1fr)) 45px minmax(45px, auto) minmax(120px, auto);
    `,
        BaseRow: `
      font-size: 14px;
      .td {
        height: 32px;
      }
    `,
        BaseCell: `
      &:nth-of-type(3) {
        text-align: right;
      }
      &:nth-of-type(4) {
        text-align: right;
      }
      &:last-of-type {
        text-align: right;
      }
    `,
        HeaderRow: `
      text-transform: uppercase;
      background-color: black;
      color: #90CAF9;
      .th {
        border-bottom: 1px solid #565656;
        height: 36px;
      }
      &:nth-of-type(1) .th {
        text-align: center;
      }
    `,
        Row: `
      background-color: #1e1e1e;
      position: relative;
      cursor: pointer;
      .td {
        border-top: 1px solid #565656;
        border-bottom: 1px solid #565656;
      }
      &.tr.tr-body.row-select.row-select-single-selected {
        background-color: #3d4752;
      }
      &:hover .td {
        border-top: 1px solid #177ac9;
        background-color: #177ac9;
      }
    `,
        Cell: `
      &:nth-of-type(2) {
        padding: 8px;
      }
      &:nth-of-type(3) {
        padding-right: 4px;
      }
      &:nth-of-type(4) {
        padding-right: 4px;
      }
      &:last-of-type {
        padding-right: 8px;
      }
    `
      }),
    []
  );

  function hasEntityChanged(de: DeviceEntity) {
    return (
      (de?.cn || '') !== (de?.o_cn || '') ||
      de.m !== de.o_m ||
      de.ma !== de.o_ma ||
      de.mi !== de.o_mi
    );
  }

  useEffect(() => {
    if (deviceEntities.length) {
      const changedEntities = deviceEntities.filter((de) => hasEntityChanged(de));
      setNumChanges(changedEntities.length);
    }
  }, [deviceEntities]);

  useEffect(() => {
    if (devices && selectedDevice !== -1) {
      void sendDeviceEntities(selectedDevice);
      const index = devices.devices.findIndex((d) => d.id === selectedDevice);
      if (index === -1) {
        setSelectedDevice(-1);
        setSelectedDeviceTypeNameURL('');
      } else {
        const device = devices.devices[index];
        if (device) {
          setSelectedDeviceTypeNameURL(device.url || '');
          setSelectedDeviceName(device.n);
        }
        setNumChanges(0);
        setRestartNeeded(false);
      }
    }
  }, [devices, selectedDevice]);

  function formatValue(value: unknown) {
    if (typeof value === 'number') {
      return new Intl.NumberFormat().format(value);
    } else if (value === undefined) {
      return '';
    } else if (typeof value === 'boolean') {
      return value ? 'true' : 'false';
    }
    return value as string;
  }

  const isCommand = useCallback((de: DeviceEntity) => {
    return de.n && de.n[0] === '!';
  }, []);

  const formatName = useCallback(
    (de: DeviceEntity, withShortname: boolean) => {
      let name: string;
      if (isCommand(de)) {
        name = de.t
          ? `${LL.COMMAND(1)}: ${de.t} ${de.n?.slice(1)}`
          : `${LL.COMMAND(1)}: ${de.n?.slice(1)}`;
      } else if (de.cn && de.cn !== '') {
        name = de.t ? `${de.t} ${de.cn}` : de.cn;
      } else {
        name = de.t ? `${de.t} ${de.n}` : de.n || '';
      }
      return withShortname ? `${name} ${de.id}` : name;
    },
    [LL]
  );

  const getMaskNumber = (newMask: string[]) => {
    let new_mask = 0;
    for (const entry of newMask) {
      new_mask |= Number(entry);
    }
    return new_mask;
  };

  const getMaskString = (m: number) => {
    const new_masks: string[] = [];
    if ((m & 1) === 1) {
      new_masks.push('1');
    }
    if ((m & 2) === 2) {
      new_masks.push('2');
    }
    if ((m & 4) === 4) {
      new_masks.push('4');
    }
    if ((m & 8) === 8) {
      new_masks.push('8');
    }
    if ((m & 128) === 128) {
      new_masks.push('128');
    }
    return new_masks;
  };

  const filter_entity = useCallback(
    (de: DeviceEntity) =>
      (de.m & selectedFilters || !selectedFilters) &&
      formatName(de, true).toLowerCase().includes(search.toLowerCase()),
    [selectedFilters, search, formatName]
  );

  const maskDisabled = useCallback(
    (set: boolean) => {
      setDeviceEntities((prev) =>
        prev.map((de) => {
          if (filter_entity(de)) {
            const excludeMask =
              DeviceEntityMask.DV_API_MQTT_EXCLUDE | DeviceEntityMask.DV_WEB_EXCLUDE;
            return {
              ...de,
              m: set ? de.m | excludeMask : de.m & ~excludeMask
            };
          }
          return de;
        })
      );
    },
    [filter_entity]
  );

  const resetCustomization = useCallback(async () => {
    try {
      await sendResetCustomizations();
      toast.info(LL.CUSTOMIZATIONS_RESTART());
    } catch (error) {
      toast.error((error as Error).message);
    } finally {
      setConfirmReset(false);
      setRestarting(true);
    }
  }, [sendResetCustomizations, LL]);

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

  const updateDeviceEntity = useCallback((updatedItem: DeviceEntity) => {
    setDeviceEntities(
      (prev) =>
        prev?.map((de) =>
          de.id === updatedItem.id ? { ...de, ...updatedItem } : de
        ) ?? []
    );
  }, []);

  const onDialogSave = useCallback(
    (updatedItem: DeviceEntity) => {
      setDialogOpen(false);
      updateDeviceEntity(updatedItem);
    },
    [updateDeviceEntity]
  );

  const editDeviceEntity = useCallback((de: DeviceEntity) => {
    if (de.n === undefined || (de.n && de.n[0] === '!')) {
      return;
    }

    if (de.cn === undefined) {
      de.cn = '';
    }

    setSelectedDeviceEntity(de);
    setDialogOpen(true);
  }, []);

  const saveCustomization = useCallback(async () => {
    if (!devices || !deviceEntities || selectedDevice === -1) {
      return;
    }

    const masked_entities = deviceEntities
      .filter((de: DeviceEntity) => hasEntityChanged(de))
      .map((new_de) => createMaskedEntityId(new_de));

    // check size in bytes to match buffer in CPP, which is 2048
    const bytes = new TextEncoder().encode(JSON.stringify(masked_entities)).length;
    if (bytes > MAX_BUFFER_SIZE) {
      toast.warning(LL.CUSTOMIZATIONS_FULL());
      return;
    }

    await sendCustomizationEntities({
      id: selectedDevice,
      entity_ids: masked_entities
    })
      .then(() => {
        toast.success(LL.CUSTOMIZATIONS_SAVED());
      })
      .catch((error: Error) => {
        if (error.message === 'Reboot required') {
          setRestartNeeded(true);
        } else {
          toast.error(error.message);
        }
      })
      .finally(() => {
        setOriginalSettings(deviceEntities);
      });
  }, [devices, deviceEntities, selectedDevice, sendCustomizationEntities, LL]);

  const renameDevice = useCallback(async () => {
    await sendDeviceName({ id: selectedDevice, name: selectedDeviceName })
      .then(() => {
        toast.success(LL.UPDATED_OF(LL.NAME(1)));
      })
      .catch(() => {
        toast.error(`${LL.UPDATE_OF(LL.NAME(1))} ${LL.FAILED(1)}`);
      })
      .finally(async () => {
        setRename(false);
        await fetchCoreData();
      });
  }, [selectedDevice, selectedDeviceName, sendDeviceName, LL, fetchCoreData]);

  const renderDeviceList = () => (
    <>
      <Box mb={1} color="warning.main">
        <Typography variant="body1">{LL.CUSTOMIZATIONS_HELP_1()}.</Typography>
      </Box>
      <Box display="flex" flexWrap="wrap" alignItems="center" gap={2}>
        {rename ? (
          <TextField
            name="device"
            label={LL.EMS_DEVICE()}
            fullWidth
            variant="outlined"
            value={selectedDeviceName}
            onChange={(e) => setSelectedDeviceName(e.target.value)}
            margin="normal"
          />
        ) : (
          <TextField
            name="device"
            label={LL.EMS_DEVICE()}
            variant="outlined"
            value={selectedDevice}
            disabled={numChanges !== 0}
            onChange={(e) => setSelectedDevice(parseInt(e.target.value))}
            margin="normal"
            style={{ minWidth: '50%' }}
            select
          >
            <MenuItem disabled key={-1} value={-1}>
              {LL.SELECT_DEVICE()}...
            </MenuItem>
            {devices.devices.map(
              (device: Device) =>
                device.id < 90 && (
                  <MenuItem key={device.id} value={device.id}>
                    {device.n}&nbsp;({device.tn})
                  </MenuItem>
                )
            )}
          </TextField>
        )}
        {selectedDevice !== -1 &&
          (rename ? (
            <>
              <Button
                startIcon={<CancelIcon />}
                variant="outlined"
                color="secondary"
                onClick={() => setRename(false)}
              >
                {LL.CANCEL()}
              </Button>
              <Button
                startIcon={<SaveIcon />}
                variant="outlined"
                onClick={() => renameDevice()}
              >
                {LL.RENAME()}
              </Button>
            </>
          ) : (
            <>
              <Button
                startIcon={<EditIcon />}
                variant="outlined"
                onClick={() => setRename(true)}
              >
                {LL.RENAME()}
              </Button>
              <Button
                startIcon={<SettingsBackupRestoreIcon />}
                variant="outlined"
                color="error"
                onClick={() => setConfirmReset(true)}
              >
                {LL.REMOVE_ALL()}
              </Button>
            </>
          ))}
      </Box>
    </>
  );

  const filteredEntities = useMemo(
    () => deviceEntities.filter((de) => filter_entity(de)),
    [deviceEntities, filter_entity]
  );

  const renderDeviceData = () => {
    return (
      <>
        <Box color="warning.main">
          <Typography variant="body2" mt={1} mb={1}>
            <OptionIcon type="favorite" isSet={true} />={LL.CUSTOMIZATIONS_HELP_2()}
            &nbsp;&nbsp;
            <OptionIcon type="readonly" isSet={true} />={LL.CUSTOMIZATIONS_HELP_3()}
            &nbsp;&nbsp;
            <OptionIcon type="api_mqtt_exclude" isSet={true} />=
            {LL.CUSTOMIZATIONS_HELP_4()}&nbsp;&nbsp;
            <OptionIcon type="web_exclude" isSet={true} />=
            {LL.CUSTOMIZATIONS_HELP_5()}&nbsp;&nbsp;
            <OptionIcon type="deleted" isSet={true} />={LL.CUSTOMIZATIONS_HELP_6()}
          </Typography>
        </Box>
        <Grid
          container
          mb={1}
          mt={0}
          spacing={2}
          direction="row"
          justifyContent="flex-start"
          alignItems="center"
        >
          <Grid>
            <TextField
              size="small"
              variant="outlined"
              placeholder={LL.SEARCH()}
              aria-label={LL.SEARCH()}
              onChange={(event) => {
                setSearch(event.target.value);
              }}
              slotProps={{
                input: {
                  startAdornment: (
                    <InputAdornment position="start">
                      <SearchIcon color="primary" sx={{ fontSize: 16 }} />
                    </InputAdornment>
                  )
                }
              }}
            />
          </Grid>
          <Grid>
            <ToggleButtonGroup
              size="small"
              color="secondary"
              value={getMaskString(selectedFilters)}
              onChange={(_, mask: string[]) => {
                setSelectedFilters(getMaskNumber(mask));
              }}
            >
              <ToggleButton value="8">
                <OptionIcon type="favorite" isSet={true} />
              </ToggleButton>
              <ToggleButton value="4">
                <OptionIcon type="readonly" isSet={true} />
              </ToggleButton>
              <ToggleButton value="2">
                <OptionIcon type="api_mqtt_exclude" isSet={true} />
              </ToggleButton>
              <ToggleButton value="1">
                <OptionIcon type="web_exclude" isSet={true} />
              </ToggleButton>
              <ToggleButton value="128">
                <OptionIcon type="deleted" isSet={true} />
              </ToggleButton>
            </ToggleButtonGroup>
          </Grid>
          <Grid>
            <Button
              size="small"
              sx={{ fontSize: 10 }}
              variant="outlined"
              color="inherit"
              onClick={() => maskDisabled(false)}
            >
              {LL.SET_ALL()}&nbsp;
              <OptionIcon type="api_mqtt_exclude" isSet={false} />
              <OptionIcon type="web_exclude" isSet={false} />
            </Button>
          </Grid>
          <Grid>
            <Button
              size="small"
              sx={{ fontSize: 10 }}
              variant="outlined"
              color="inherit"
              onClick={() => maskDisabled(true)}
            >
              {LL.SET_ALL()}&nbsp;
              <OptionIcon type="api_mqtt_exclude" isSet={true} />
              <OptionIcon type="web_exclude" isSet={true} />
            </Button>
          </Grid>
          <Grid>
            <Typography variant="subtitle2" color="grey">
              {LL.SHOWING()}&nbsp;{filteredEntities.length}/{deviceEntities.length}
              &nbsp;{LL.ENTITIES(deviceEntities.length)}
            </Typography>
          </Grid>
        </Grid>
        <Table
          data={{ nodes: filteredEntities }}
          theme={entities_theme}
          layout={{ custom: true }}
        >
          {(tableList: DeviceEntity[]) => (
            <>
              <Header>
                <HeaderRow>
                  <HeaderCell stiff>{LL.OPTIONS()}</HeaderCell>
                  <HeaderCell resize>{LL.NAME(1)}</HeaderCell>
                  <HeaderCell stiff>{LL.MIN()}</HeaderCell>
                  <HeaderCell stiff>{LL.MAX()}</HeaderCell>
                  <HeaderCell resize>{LL.VALUE(0)}</HeaderCell>
                </HeaderRow>
              </Header>
              <Body>
                {tableList.map((de: DeviceEntity) => (
                  <Row key={de.id} item={de} onClick={() => editDeviceEntity(de)}>
                    <Cell stiff>
                      <EntityMaskToggle onUpdate={updateDeviceEntity} de={de} />
                    </Cell>
                    <Cell>
                      <span
                        style={{
                          color:
                            de.v === undefined && !isCommand(de) ? 'grey' : 'inherit'
                        }}
                      >
                        {formatName(de, false)}&nbsp;(
                        <Link
                          style={{
                            color:
                              de.v === undefined && !isCommand(de)
                                ? 'grey'
                                : 'primary'
                          }}
                          target="_blank"
                          href={APIURL + selectedDeviceTypeNameURL + '/' + de.id}
                        >
                          {de.id}
                        </Link>
                        )
                      </span>
                    </Cell>
                    <Cell>
                      {!(de.m & DeviceEntityMask.DV_READONLY) && formatValue(de.mi)}
                    </Cell>
                    <Cell>
                      {!(de.m & DeviceEntityMask.DV_READONLY) && formatValue(de.ma)}
                    </Cell>
                    <Cell>{formatValue(de.v)}</Cell>
                  </Row>
                ))}
              </Body>
            </>
          )}
        </Table>
      </>
    );
  };

  const renderResetDialog = () => (
    <Dialog
      sx={dialogStyle}
      open={confirmReset}
      onClose={() => setConfirmReset(false)}
    >
      <DialogTitle>{LL.REMOVE_ALL()}</DialogTitle>
      <DialogContent dividers>{LL.CUSTOMIZATIONS_RESET()}</DialogContent>
      <DialogActions>
        <Button
          startIcon={<CancelIcon />}
          variant="outlined"
          onClick={() => setConfirmReset(false)}
          color="secondary"
        >
          {LL.CANCEL()}
        </Button>
        <Button
          startIcon={<SettingsBackupRestoreIcon />}
          variant="outlined"
          onClick={resetCustomization}
          color="error"
        >
          {LL.REMOVE_ALL()}
        </Button>
      </DialogActions>
    </Dialog>
  );

  const renderContent = () => (
    <>
      {devices && renderDeviceList()}
      {selectedDevice !== -1 && !rename && renderDeviceData()}
      {restartNeeded ? (
        <MessageBox level="warning" message={LL.RESTART_TEXT(0)}>
          <Button
            sx={{ ml: 2 }}
            startIcon={<PowerSettingsNewIcon />}
            variant="contained"
            color="error"
            onClick={doRestart}
          >
            {LL.RESTART()}
          </Button>
        </MessageBox>
      ) : (
        <Box display="flex" flexWrap="wrap">
          <Box flexGrow={1}>
            {numChanges !== 0 && (
              <ButtonRow>
                <Button
                  startIcon={<CancelIcon />}
                  variant="outlined"
                  color="secondary"
                  onClick={() => {
                    if (devices) {
                      void sendDeviceEntities(selectedDevice);
                    }
                  }}
                >
                  {LL.CANCEL()}
                </Button>
                <Button
                  startIcon={<WarningIcon color="warning" />}
                  variant="contained"
                  color="info"
                  onClick={saveCustomization}
                >
                  {LL.APPLY_CHANGES(numChanges)}
                </Button>
              </ButtonRow>
            )}
          </Box>
        </Box>
      )}
      {renderResetDialog()}
    </>
  );

  return (
    <SectionContent>
      {blocker ? <BlockNavigation blocker={blocker} /> : null}
      {restarting ? <SystemMonitor /> : renderContent()}
      {selectedDeviceEntity && (
        <SettingsCustomizationsDialog
          open={dialogOpen}
          onClose={onDialogClose}
          onSave={onDialogSave}
          selectedItem={selectedDeviceEntity}
        />
      )}
    </SectionContent>
  );
};

export default Customizations;