// @flow
import React, { PureComponent } from 'react'
import any from 'ramda/src/any'
import append from 'ramda/src/append'
import equals from 'ramda/src/equals'
import map from 'ramda/src/map'
import pathOr from 'ramda/src/pathOr'
import prop from 'ramda/src/prop'
import propOr from 'ramda/src/propOr'
import reject from 'ramda/src/reject'
import uniq from 'ramda/src/uniq'
import Box from '../../elements/Box'
import Checkbox from '../../elements/Checkbox'
import ErrorMessage from '../../elements/ErrorMessage'
import Grid from '../../elements/Grid'
import Label from '../../elements/Label'
import { isNotEmptyOrNotNil } from '../../utils'
import { type EventType, type InputType, type MetaType } from '../../types'

const checkboxGridModifierProps = (modifier, columns) => {
  switch (modifier) {
    case 'vertical':
      return null
    default:
      return {
        gridTemplateColumns: [
          '1fr',
          `repeat(${columns != null ? columns : 4}, 1fr)`,
          `repeat(${columns != null ? columns : 4}, 1fr)`,
        ],
        gridTemplateRows: [
          `repeat(${columns != null ? columns : 4}, 1fr)`,
          '1fr',
          '1fr',
        ],
      }
  }
}

type Props = {
  change?: (string | () => string, Array<string> | () => Array<string>) => void,
  columns?: number,
  input?: InputType,
  gridStyles?: {},
  label: string,
  labelColor?: ?string,
  labelModifier?: ?string,
  labelTextStyle?: string,
  meta?: MetaType,
  modifier?: string,
  noLabel?: boolean,
  onChange?: ?(boolean, Array<string>) => void,
  onChangeDouble?: ?(boolean, Array<string>) => void,
  readOnly?: boolean,
  values: Array<{
    label: string,
    value: string,
    id?: ?string,
  }>,
}

type State = {
  values: Array<string>,
}

class CheckboxGroup extends PureComponent<Props, State> {
  static defaultProps = {
    change: undefined,
    columns: 4,
    gridStyles: undefined,
    input: undefined,
    labelColor: undefined,
    labelModifier: undefined,
    labelTextStyle: '',
    meta: undefined,
    modifier: 'horizontal',
    noLabel: false,
    onChange: undefined,
    onChangeDouble: undefined,
    readOnly: false,
  }

  // eslint-disable-next-line react/no-unused-state
  state = { values: [] }

  componentWillMount() {
    this.setState((state, props) => {
      const { change, input } = props
      const inputVals = pathOr([], ['input', 'value'], props)
      const uniqVals = uniq(inputVals)

      if (input && change && uniqVals !== inputVals) {
        change(input.name, uniqVals)
      }
      return {
        values: uniqVals,
      }
    })
  }

  handleOnChange = (e: EventType) => {
    const { target } = e
    this.setState((state, props) => {
      let newValues = state.values
      const { change, input, onChange, onChangeDouble } = props
      if (target && target.checked && any(equals(target.value), newValues)) {
        newValues = state.values
      } else if (target && target.checked) {
        newValues = append(target.value, newValues)
      } else if (target && !target.checked) {
        newValues = reject(equals(target.value), newValues)
      }
      if (change && input) {
        change(input.name, newValues)
      }
      if (onChangeDouble != null) {
        onChangeDouble(target.checked, newValues)
      } else if (onChange) {
        onChange(target.checked, newValues)
      }
      return {
        values: uniq(newValues),
      }
    })
  }

  render() {
    const { columns, input, label, labelColor, labelModifier, labelTextStyle,
      meta, modifier, noLabel, onChange, onChangeDouble,
      readOnly, values, gridStyles, ...styles
    } = this.props

    return (
      <Box {...styles}>
        <Label
          color={labelColor}
          fontSize={2}
          hidden={noLabel}
          htmlFor={prop('name', input)}
          mb={4}
          textStyle={labelModifier === 'decal' ? 'uppercase' : labelTextStyle}
          modifier={labelModifier}
        >
          {label}
        </Label>
        <Grid
          gridColumnGap={3}
          gridRowGap={4}
          {...checkboxGridModifierProps(modifier, columns)}
          // $FlowFixMe: Dont want to limit styled-system props
          {...gridStyles}
        >
          { map(({ label: optionLabel, value: optionValue }) => (
            <Checkbox
              defaultChecked={any(equals(optionValue), propOr([], 'value', input))}
              id={`${prop('name', input)}-${optionLabel}`}
              key={optionLabel}
              label={optionLabel}
              name={prop('name', input)}
              onFocus={prop('onFocus', input)}
              onChange={this.handleOnChange}
              onBlur={this.handleOnChange}
              readOnly={readOnly === true}
              value={optionValue}
            />
          ), values)
          }
        </Grid>
        { prop('touched', meta) === true && isNotEmptyOrNotNil(prop('error', meta))
          && (
          <ErrorMessage
            message={prop('error', meta)}
            maxWidth={116}
          />
          )
        }
      </Box>
    )
  }
}

export default CheckboxGroup