import React, { useState } from 'react';
import {
  Accordion, AccordionSummary, AccordionDetails, makeStyles, Typography, TextField, FormControl, InputLabel, MenuItem, Select,
} from '@material-ui/core';
import InputAdornment from '@material-ui/core/InputAdornment';
import ExpandMoreIcon from '@material-ui/icons/ExpandMore';
import { prefixString } from '../common/util/stringUtils';
import EditItemView from './components/EditItemView';
import EditAttributesView from './components/EditAttributesView';
import { useAttributePreference } from '../common/util/preferences';
import {
  speedFromKnots, speedToKnots, distanceFromMeters, distanceToMeters,
} from '../common/util/converter';
import { useTranslation } from '../common/components/LocalizationProvider';
import usePositionAttributes from '../common/attributes/usePositionAttributes';
import SettingsMenu from './components/SettingsMenu';

const useStyles = makeStyles(() => ({
  details: {
    flexDirection: 'column',
  },
}));

const MaintenancePage = () => {
  const classes = useStyles();
  const t = useTranslation();

  const positionAttributes = usePositionAttributes(t);

  const [item, setItem] = useState();
  const [labels, setLabels] = useState({ start: '', period: '' });

  const speedUnit = useAttributePreference('speedUnit');
  const distanceUnit = useAttributePreference('distanceUnit');

  const convertToList = (attributes) => {
    const otherList = [];
    Object.keys(attributes).forEach((key) => {
      const value = attributes[key];
      if (value.type === 'number') {
        otherList.push({ key, name: value.name, type: value.type });
      }
    });
    return otherList;
  };

  const onMaintenanceTypeChange = (event) => {
    const newValue = event.target.value;
    setItem({
      ...item, type: newValue, start: 0, period: 0,
    });

    const attribute = positionAttributes[newValue];
    if (attribute && attribute.dataType) {
      switch (attribute.dataType) {
        case 'distance':
          setLabels({ ...labels, start: t(prefixString('shared', distanceUnit)), period: t(prefixString('shared', distanceUnit)) });
          break;
        case 'speed':
          setLabels({ ...labels, start: t(prefixString('shared', speedUnit)), period: t(prefixString('shared', speedUnit)) });
          break;
        default:
          break;
      }
    }
  };

  const rawToValue = (value) => {
    const attribute = positionAttributes[item.type];
    if (attribute && attribute.dataType) {
      switch (attribute.dataType) {
        case 'speed':
          return speedFromKnots(value, speedUnit);
        case 'distance':
          return distanceFromMeters(value, distanceUnit);
        default:
          return value;
      }
    }
    return value;
  };

  const valueToRaw = (value) => {
    const attribute = positionAttributes[item.type];
    if (attribute && attribute.dataType) {
      switch (attribute.dataType) {
        case 'speed':
          return speedToKnots(value, speedUnit);
        case 'distance':
          return distanceToMeters(value, distanceUnit);
        default:
          return value;
      }
    }
    return value;
  };

  const validate = () => item && item.name && item.type && item.start && item.period;

  return (
    <EditItemView
      endpoint="maintenance"
      item={item}
      setItem={setItem}
      validate={validate}
      menu={<SettingsMenu />}
      breadcrumbs={['settingsTitle', 'sharedMaintenance']}
    >
      {item && (
        <>
          <Accordion defaultExpanded>
            <AccordionSummary expandIcon={<ExpandMoreIcon />}>
              <Typography variant="subtitle1">
                {t('sharedRequired')}
              </Typography>
            </AccordionSummary>
            <AccordionDetails className={classes.details}>
              <TextField
                margin="normal"
                value={item.name || ''}
                onChange={(event) => setItem({ ...item, name: event.target.value })}
                label={t('sharedName')}
                variant="filled"
              />
              <FormControl variant="filled" margin="normal" fullWidth>
                <InputLabel>{t('sharedType')}</InputLabel>
                <Select
                  value={item.type || ''}
                  onChange={onMaintenanceTypeChange}
                >
                  {convertToList(positionAttributes).map(({ key, name }) => (
                    <MenuItem key={key} value={key}>{name}</MenuItem>
                  ))}
                </Select>
              </FormControl>
              <TextField
                margin="normal"
                type="number"
                value={rawToValue(item.start) || ''}
                onChange={(event) => setItem({ ...item, start: valueToRaw(event.target.value) })}
                label={t('maintenanceStart')}
                variant="filled"
                InputProps={{
                  endAdornment: <InputAdornment position="start">{labels.start}</InputAdornment>,
                }}
              />
              <TextField
                margin="normal"
                type="number"
                value={rawToValue(item.period) || ''}
                onChange={(event) => setItem({ ...item, period: valueToRaw(event.target.value) })}
                label={t('maintenancePeriod')}
                variant="filled"
                InputProps={{
                  endAdornment: <InputAdornment position="start">{labels.period}</InputAdornment>,
                }}
              />
            </AccordionDetails>
          </Accordion>
          <Accordion>
            <AccordionSummary expandIcon={<ExpandMoreIcon />}>
              <Typography variant="subtitle1">
                {t('sharedAttributes')}
              </Typography>
            </AccordionSummary>
            <AccordionDetails className={classes.details}>
              <EditAttributesView
                attributes={item.attributes}
                setAttributes={(attributes) => setItem({ ...item, attributes })}
                definitions={{}}
              />
            </AccordionDetails>
          </Accordion>
        </>
      )}
    </EditItemView>
  );
};

export default MaintenancePage;