import { useCallback, useMemo, useState } from 'react';
import { toast } from 'react-toastify';

import CancelIcon from '@mui/icons-material/Cancel';
import SettingsBackupRestoreIcon from '@mui/icons-material/SettingsBackupRestore';
import WarningIcon from '@mui/icons-material/Warning';
import {
  Box,
  Button,
  Checkbox,
  Grid,
  InputAdornment,
  MenuItem,
  TextField,
  Typography
} from '@mui/material';

import * as MqttApi from 'api/mqtt';

import type { ValidateFieldsError } from 'async-validator';
import {
  BlockFormControlLabel,
  BlockNavigation,
  ButtonRow,
  FormLoader,
  SectionContent,
  ValidatedPasswordField,
  ValidatedTextField,
  useLayoutTitle
} from 'components';
import { useI18nContext } from 'i18n/i18n-react';
import type { MqttSettingsType } from 'types';
import { numberValue, updateValueDirty, useRest } from 'utils';
import { createMqttSettingsValidator, validate } from 'validators';

import { callAction } from '../../api/app';

const MqttSettings = () => {
  const {
    loadData,
    saving,
    data,
    updateDataValue,
    origData,
    dirtyFlags,
    setDirtyFlags,
    blocker,
    saveData,
    errorMessage
  } = useRest<MqttSettingsType>({
    read: MqttApi.readMqttSettings,
    update: MqttApi.updateMqttSettings
  });

  const { LL } = useI18nContext();
  useLayoutTitle('MQTT');

  const [fieldErrors, setFieldErrors] = useState<ValidateFieldsError>();

  const sendResetMQTT = useCallback(() => {
    void callAction({ action: 'resetMQTT' })
      .then(() => {
        toast.success('MQTT ' + LL.REFRESH() + ' successful');
      })
      .catch((error) => {
        toast.error(String(error.error?.message || 'An error occurred'));
      });
  }, []);

  const updateFormValue = useMemo(
    () =>
      updateValueDirty(
        origData as unknown as Record<string, unknown>,
        dirtyFlags,
        setDirtyFlags,
        updateDataValue as (value: unknown) => void
      ),
    [origData, dirtyFlags, setDirtyFlags, updateDataValue]
  );

  const SecondsInputProps = useMemo(
    () => ({
      endAdornment: <InputAdornment position="end">{LL.SECONDS()}</InputAdornment>
    }),
    [LL]
  );

  const emptyFieldErrors = useMemo(() => ({}), []);

  const validateAndSubmit = useCallback(async () => {
    if (!data) return;
    try {
      setFieldErrors(undefined);
      await validate(createMqttSettingsValidator(data), data);
      await saveData();
    } catch (error) {
      setFieldErrors(error as ValidateFieldsError);
    }
  }, [data, saveData]);

  const publishIntervalFields = useMemo(
    () => [
      { name: 'publish_time_heartbeat', label: 'Heartbeat', validated: true },
      { name: 'publish_time_boiler', label: LL.MQTT_INT_BOILER(), validated: false },
      {
        name: 'publish_time_thermostat',
        label: LL.MQTT_INT_THERMOSTATS(),
        validated: false
      },
      { name: 'publish_time_solar', label: LL.MQTT_INT_SOLAR(), validated: false },
      { name: 'publish_time_mixer', label: LL.MQTT_INT_MIXER(), validated: false },
      { name: 'publish_time_water', label: LL.MQTT_INT_WATER(), validated: false },
      { name: 'publish_time_sensor', label: LL.SENSORS(), validated: false },
      { name: 'publish_time_other', label: LL.DEFAULT(0), validated: false }
    ],
    [LL]
  );

  if (!data) {
    return (
      <SectionContent>
        {blocker ? <BlockNavigation blocker={blocker} /> : null}
        <FormLoader onRetry={loadData} errorMessage={errorMessage || ''} />
      </SectionContent>
    );
  }

  return (
    <SectionContent>
      {blocker ? <BlockNavigation blocker={blocker} /> : null}
      <>
        <Box display="flex" gap={2} mb={1}>
          <BlockFormControlLabel
            control={
              <Checkbox
                name="enabled"
                checked={data.enabled}
                onChange={updateFormValue}
              />
            }
            label={LL.ENABLE_MQTT()}
          />
          {data.enabled && (
            <Button
              startIcon={<SettingsBackupRestoreIcon />}
              color="secondary"
              variant="outlined"
              onClick={sendResetMQTT}
            >
              {LL.REFRESH() + ' MQTT'}
            </Button>
          )}
        </Box>
        <Grid container spacing={2} rowSpacing={0}>
          <Grid>
            <ValidatedTextField
              fieldErrors={fieldErrors ?? emptyFieldErrors}
              name="host"
              label={LL.ADDRESS_OF(LL.BROKER())}
              multiline
              variant="outlined"
              value={data.host}
              onChange={updateFormValue}
              margin="normal"
            />
          </Grid>
          <Grid>
            <ValidatedTextField
              fieldErrors={fieldErrors ?? emptyFieldErrors}
              name="port"
              label="Port"
              variant="outlined"
              value={numberValue(data.port)}
              type="number"
              onChange={updateFormValue}
              margin="normal"
            />
          </Grid>
          <Grid>
            <ValidatedTextField
              fieldErrors={fieldErrors ?? emptyFieldErrors}
              name="base"
              label={LL.BASE_TOPIC()}
              variant="outlined"
              value={data.base}
              onChange={updateFormValue}
              margin="normal"
            />
          </Grid>
          <Grid>
            <TextField
              name="client_id"
              label={`${LL.ID_OF(LL.CLIENT())} (${LL.OPTIONAL()})`}
              variant="outlined"
              value={data.client_id}
              onChange={updateFormValue}
              margin="normal"
            />
          </Grid>
          <Grid>
            <TextField
              name="username"
              label={LL.USERNAME(0)}
              variant="outlined"
              value={data.username}
              onChange={updateFormValue}
              margin="normal"
            />
          </Grid>
          <Grid>
            <ValidatedPasswordField
              name="password"
              label={LL.PASSWORD()}
              variant="outlined"
              value={data.password}
              onChange={updateFormValue}
              margin="normal"
            />
          </Grid>
          <Grid>
            <ValidatedTextField
              fieldErrors={fieldErrors ?? emptyFieldErrors}
              name="keep_alive"
              label="Keep Alive"
              slotProps={{
                input: SecondsInputProps
              }}
              variant="outlined"
              value={numberValue(data.keep_alive)}
              type="number"
              onChange={updateFormValue}
              margin="normal"
            />
          </Grid>
          <Grid>
            <TextField
              name="mqtt_qos"
              label="QoS"
              value={data.mqtt_qos}
              variant="outlined"
              onChange={updateFormValue}
              margin="normal"
              select
            >
              <MenuItem value={0}>0</MenuItem>
              <MenuItem value={1}>1</MenuItem>
              <MenuItem value={2}>2</MenuItem>
            </TextField>
          </Grid>
        </Grid>
        {data.enableTLS !== undefined && (
          <BlockFormControlLabel
            control={
              <Checkbox
                name="enableTLS"
                checked={data.enableTLS}
                onChange={updateFormValue}
              />
            }
            label={LL.ENABLE_TLS()}
          />
        )}
        {data.enableTLS === true && (
          <ValidatedPasswordField
            name="rootCA"
            label={LL.CERT()}
            variant="outlined"
            value={data.rootCA}
            onChange={updateFormValue}
            margin="normal"
          />
        )}
        <BlockFormControlLabel
          control={
            <Checkbox
              name="clean_session"
              checked={data.clean_session}
              onChange={updateFormValue}
            />
          }
          label={LL.MQTT_CLEAN_SESSION()}
        />
        <BlockFormControlLabel
          control={
            <Checkbox
              name="mqtt_retain"
              checked={data.mqtt_retain}
              onChange={updateFormValue}
            />
          }
          label={LL.MQTT_RETAIN_FLAG()}
        />
        <Typography sx={{ pt: 2 }} variant="h6" color="primary">
          {LL.FORMATTING()}
        </Typography>
        <TextField
          name="nested_format"
          label={LL.MQTT_FORMAT()}
          value={data.nested_format}
          variant="outlined"
          onChange={updateFormValue}
          margin="normal"
          select
        >
          <MenuItem value={1}>{LL.MQTT_NEST_1()}</MenuItem>
          <MenuItem value={2}>{LL.MQTT_NEST_2()}</MenuItem>
        </TextField>
        <BlockFormControlLabel
          control={
            <Checkbox
              name="send_response"
              checked={data.send_response}
              onChange={updateFormValue}
            />
          }
          label={LL.MQTT_RESPONSE()}
        />
        <Grid container spacing={2} rowSpacing={0}>
          <Grid>
            <BlockFormControlLabel
              control={
                <Checkbox
                  name="publish_single"
                  checked={data.publish_single}
                  onChange={updateFormValue}
                  disabled={data.ha_enabled}
                />
              }
              label={LL.MQTT_PUBLISH_TEXT_1()}
            />
          </Grid>
          {data.publish_single && (
            <Grid>
              <BlockFormControlLabel
                control={
                  <Checkbox
                    name="publish_single2cmd"
                    checked={data.publish_single2cmd}
                    onChange={updateFormValue}
                  />
                }
                label={LL.MQTT_PUBLISH_TEXT_2()}
              />
            </Grid>
          )}
        </Grid>
        <Grid container spacing={2} rowSpacing={0}>
          <Grid>
            <BlockFormControlLabel
              control={
                <Checkbox
                  name="ha_enabled"
                  checked={data.ha_enabled}
                  onChange={updateFormValue}
                  disabled={data.publish_single}
                />
              }
              label={LL.MQTT_PUBLISH_TEXT_3()}
            />
          </Grid>
          {data.ha_enabled && (
            <Grid container spacing={2} rowSpacing={0}>
              <Grid>
                <TextField
                  name="discovery_type"
                  label={LL.MQTT_PUBLISH_TEXT_5()}
                  value={data.discovery_type}
                  variant="outlined"
                  onChange={updateFormValue}
                  margin="normal"
                  select
                >
                  <MenuItem value={0}>Home Assistant</MenuItem>
                  <MenuItem value={1}>Domoticz</MenuItem>
                  <MenuItem value={2}>Domoticz (latest)</MenuItem>
                </TextField>
              </Grid>
              <Grid>
                <TextField
                  name="discovery_prefix"
                  label={LL.MQTT_PUBLISH_TEXT_4()}
                  variant="outlined"
                  value={data.discovery_prefix}
                  onChange={updateFormValue}
                  margin="normal"
                />
              </Grid>
              <Grid>
                <TextField
                  name="entity_format"
                  label={LL.MQTT_ENTITY_FORMAT()}
                  value={data.entity_format}
                  variant="outlined"
                  onChange={updateFormValue}
                  margin="normal"
                  select
                >
                  <MenuItem value={0}>{LL.MQTT_ENTITY_FORMAT_0()}</MenuItem>
                  <MenuItem value={3}>
                    {LL.MQTT_ENTITY_FORMAT_1()}&nbsp;(v3.5)
                  </MenuItem>
                  <MenuItem value={4}>
                    {LL.MQTT_ENTITY_FORMAT_2()}&nbsp;(v3.5)
                  </MenuItem>
                  <MenuItem value={1}>
                    {LL.MQTT_ENTITY_FORMAT_1()}&nbsp;(latest)
                  </MenuItem>
                  <MenuItem value={2}>
                    {LL.MQTT_ENTITY_FORMAT_2()}&nbsp;(latest)
                  </MenuItem>
                </TextField>
              </Grid>
            </Grid>
          )}
        </Grid>
        <Typography sx={{ pt: 2 }} variant="h6" color="primary">
          {LL.MQTT_PUBLISH_INTERVALS()}&nbsp;(0=auto)
        </Typography>
        <Grid container spacing={2} rowSpacing={0}>
          {publishIntervalFields.map((field) => (
            <Grid key={field.name}>
              {field.validated ? (
                <ValidatedTextField
                  fieldErrors={fieldErrors ?? emptyFieldErrors}
                  name={field.name}
                  label={field.label}
                  slotProps={{
                    input: SecondsInputProps
                  }}
                  variant="outlined"
                  value={numberValue(
                    data[field.name as keyof MqttSettingsType] as number
                  )}
                  type="number"
                  onChange={updateFormValue}
                  margin="normal"
                />
              ) : (
                <TextField
                  name={field.name}
                  label={field.label}
                  variant="outlined"
                  value={numberValue(
                    data[field.name as keyof MqttSettingsType] as number
                  )}
                  type="number"
                  onChange={updateFormValue}
                  margin="normal"
                  slotProps={{
                    input: SecondsInputProps
                  }}
                />
              )}
            </Grid>
          ))}
        </Grid>
        {dirtyFlags && dirtyFlags.length !== 0 && (
          <ButtonRow>
            <Button
              startIcon={<CancelIcon />}
              disabled={saving}
              variant="outlined"
              color="secondary"
              type="submit"
              onClick={loadData}
            >
              {LL.CANCEL()}
            </Button>
            <Button
              startIcon={<WarningIcon color="warning" />}
              disabled={saving}
              variant="contained"
              color="info"
              type="submit"
              onClick={validateAndSubmit}
            >
              {LL.APPLY_CHANGES(dirtyFlags.length)}
            </Button>
          </ButtonRow>
        )}
      </>
    </SectionContent>
  );
};

export default MqttSettings;