text: // @flow weak
  
  import React from 'react';
  import type { Node, ComponentType } from 'react';
  import PropTypes from 'prop-types';
  import classNames from 'classnames';
  import withStyles from '../styles/withStyles';
  import { isMuiComponent } from '../utils/reactHelpers';
  import Textarea from './Textarea';
  
  // Supports determination of isControlled().
  // Controlled input accepts its current value as a prop.
  //
  // @see https://facebook.github.io/react/docs/forms.html#controlled-components
  // @param value
  // @returns {boolean} true if string (including '') or number (including zero)
  export function hasValue(value: ?(number | string | Array<*>)) {
    return value !== undefined && value !== null && !(Array.isArray(value) && value.length === 0);
  }
  
  // Determine if field is dirty (a.k.a. filled).
  //
  // Response determines if label is presented above field or as placeholder.
  //
  // @param obj
  // @param SSR
  // @returns {boolean} False when not present or empty string.
  //                    True when any number or string with length.
  export function isDirty(obj, SSR = false) {
    return (
      obj &&
      ((hasValue(obj.value) && obj.value !== '') ||
        (SSR && hasValue(obj.defaultValue) && obj.defaultValue !== ''))
    );
  }
  
  // Determine if an Input is adorned on start.
  // It's corresponding to the left with LTR.
  //
  // @param obj
  // @returns {boolean} False when no adornments.
  //                    True when adorned at the start.
  export function isAdornedStart(obj) {
    return obj.startAdornment;
  }
  
  export const styles = (theme: Object) => {
    const placeholder = {
      color: 'currentColor',
      opacity: theme.palette.type === 'light' ? 0.42 : 0.5,
      transition: theme.transitions.create('opacity', {
        duration: theme.transitions.duration.shorter,
        easing: theme.transitions.easing.ease,
      }),
    };
    const placeholderHidden = {
      opacity: 0,
    };
    const placeholderVisible = {
      opacity: theme.palette.type === 'light' ? 0.42 : 0.5,
    };
  
    return {
      root: {
        // Mimics the default input display property used by browsers for an input.
        display: 'inline-flex',
        alignItems: 'baseline',
        position: 'relative',
        fontFamily: theme.typography.fontFamily,
        color: theme.palette.input.inputText,
        fontSize: theme.typography.pxToRem(16),
      },
      formControl: {
        'label + &': {
          marginTop: theme.spacing.unit * 2,
        },
      },
      inkbar: {
        '&:after': {
          backgroundColor: theme.palette.primary[theme.palette.type === 'light' ? 'A700' : 'A200'],
          left: 0,
          bottom: 0,
          // Doing the other way around crash on IE11 "''" https://github.com/cssinjs/jss/issues/242
          content: '""',
          height: 2,
          position: 'absolute',
          right: 0,
          transform: 'scaleX(0)',
          transition: theme.transitions.create('transform', {
            duration: theme.transitions.duration.shorter,
            easing: theme.transitions.easing.easeOut,
          }),
          pointerEvents: 'none', // Transparent to the hover style.
        },
        '&$focused:after': {
          transform: 'scaleX(1)',
        },
      },
      error: {
        '&:after': {
          backgroundColor: theme.palette.error.A400,
          transform: 'scaleX(1)', // error is always underlined in red
        },
      },
      focused: {},
      disabled: {
        color: theme.palette.text.disabled,
      },
      underline: {
        '&:before': {
          backgroundColor: theme.palette.input.bottomLine,
          left: 0,
          bottom: 0,
          // Doing the other way around crash on IE11 "''" https://github.com/cssinjs/jss/issues/242
          content: '""',
          height: 1,
          position: 'absolute',
          right: 0,
          transition: theme.transitions.create('background-color', {
            duration: theme.transitions.duration.shorter,
            easing: theme.transitions.easing.ease,
          }),
          pointerEvents: 'none', // Transparent to the hover style.
        },
        '&:hover:not($disabled):before': {
          backgroundColor: theme.palette.text.primary,
          height: 2,
        },
        '&$disabled:before': {
          background: 'transparent',
          backgroundImage: `linear-gradient(to right, ${
            theme.palette.input.bottomLine
          } 33%, transparent 0%)`,
          backgroundPosition: 'left top',
          backgroundRepeat: 'repeat-x',
          backgroundSize: '5px 1px',
        },
      },
      multiline: {
        padding: `${theme.spacing.unit - 2}px 0 ${theme.spacing.unit - 1}px`,
      },
      fullWidth: {
        width: '100%',
      },
      input: {
        font: 'inherit',
        color: 'currentColor',
        padding: `${theme.spacing.unit - 2}px 0 ${theme.spacing.unit - 1}px`,
        border: 0,
        boxSizing: 'content-box',
        verticalAlign: 'middle',
        background: 'none',
        margin: 0, // Reset for Safari
        // Remove grey highlight
        WebkitTapHighlightColor: theme.palette.common.transparent,
        display: 'block',
        // Make the flex item shrink with Firefox
        minWidth: 0,
        width: '100%',
        '&::-webkit-input-placeholder': placeholder,
        '&::-moz-placeholder': placeholder, // Firefox 19+
        '&:-ms-input-placeholder': placeholder, // IE 11
        '&::-ms-input-placeholder': placeholder, // Edge
        '&:focus': {
          outline: 0,
        },
        // Reset Firefox invalid required input style
        '&:invalid': {
          boxShadow: 'none',
        },
        '&::-webkit-search-decoration': {
          // Remove the padding when type=search.
          appearance: 'none',
        },
        // Show and hide the placeholder logic
        'label[data-shrink=false] + $formControl &': {
          '&::-webkit-input-placeholder': placeholderHidden,
          '&::-moz-placeholder': placeholderHidden, // Firefox 19+
          '&:-ms-input-placeholder': placeholderHidden, // IE 11
          '&::-ms-input-placeholder': placeholderHidden, // Edge
          '&:focus::-webkit-input-placeholder': placeholderVisible,
          '&:focus::-moz-placeholder': placeholderVisible, // Firefox 19+
          '&:focus:-ms-input-placeholder': placeholderVisible, // IE 11
          '&:focus::-ms-input-placeholder': placeholderVisible, // Edge
        },
      },
      inputDense: {
        paddingTop: theme.spacing.unit / 2 - 1,
      },
      inputDisabled: {
        opacity: 1, // Reset iOS opacity
      },
      inputSingleline: {
        height: '1.1875em', // Reset (19px)
      },
      inputMultiline: {
        resize: 'none',
        padding: 0,
      },
      inputSearch: {
        appearance: 'textfield', // Improve type search style.
      },
    };
  };
  
  type ProvidedProps = {
    classes: Object,
    /**
     * @ignore
     */
    theme?: Object,
  };
  
  export type Props = {
    /**
     * This property helps users to fill forms faster, especially on mobile devices.
     * The name can be confusing, it's more like an autofill.
     * You can learn more about it in this article
     * https://developers.google.com/web/updates/2015/06/checkout-faster-with-autofill
     */
    autoComplete?: string,
    /**
     * If `true`, the input will be focused during the first mount.
     */
    autoFocus?: boolean,
    /**
     * Useful to extend the style applied to components.
     */
    classes?: Object,
    /**
     * The CSS class name of the wrapper element.
     */
    className?: string,
    /**
     * The default input value, useful when not controlling the component.
     */
    defaultValue?: string | number,
    /**
     * If `true`, the input will be disabled.
     */
    disabled?: boolean,
    /**
     * If `true`, the input will not have an underline.
     */
    disableUnderline?: boolean,
    /**
     * End `InputAdornment` for this component.
     */
    endAdornment?: Node,
    /**
     * If `true`, the input will indicate an error. This is normally obtained via context from
     * FormControl.
     */
    error?: boolean,
    /**
     * If `true`, the input will take up the full width of its container.
     */
    fullWidth?: boolean,
    /**
     * The id of the `input` element.
     */
    id?: string,
    /**
     * The component used for the native input.
     * Either a string to use a DOM element or a component.
     */
    inputComponent?: string | ComponentType<*>,
    /**
     * Properties applied to the `input` element.
     */
    inputProps?: Object,
    /**
     * Use that property to pass a ref callback to the native input component.
     */
    inputRef?: Function,
    /**
     * If `dense`, will adjust vertical spacing. This is normally obtained via context from
     * FormControl.
     */
    margin?: 'dense' | 'none',
    /**
     * If `true`, a textarea element will be rendered.
     */
    multiline?: boolean,
    /**
     * Name attribute of the `input` element.
     */
    name?: string,
    /**
     * @ignore
     */
    readOnly?: boolean,
    /**
     * @ignore
     */
    onBlur?: (event: SyntheticFocusEvent<>) => void,
    /**
     * Callback fired when the value is changed.
     *
     * @param {object} event The event source of the callback
     */
    onChange?: (event: SyntheticInputEvent<HTMLElement>) => void,
    /**
     * TODO
     */
    onClean?: () => void,
    /**
     * TODO
     */
    onDirty?: () => void,
    /**
     * @ignore
     */
    onFocus?: (event: SyntheticFocusEvent<>) => void,
    /**
     * @ignore
     */
    onKeyDown?: (event: SyntheticKeyboardEvent<>) => void,
    /**
     * @ignore
     */
    onKeyUp?: (event: SyntheticKeyboardEvent<>) => void,
    /**
     * The short hint displayed in the input before the user enters a value.
     */
    placeholder?: string,
    /**
     * Number of rows to display when multiline option is set to true.
     */
    rows?: string | number,
    /**
     * Maximum number of rows to display when multiline option is set to true.
     */
    rowsMax?: string | number,
    /**
     * Start `InputAdornment` for this component.
     */
    startAdornment?: Node,
    /**
     * Type of the input element. It should be a valid HTML5 input type.
     */
    type?: string,
    /**
     * The input value, required for a controlled component.
     */
    value?: string | number | Array<string | number>,
  };
  
  type State = {
    focused: boolean,
  };
  
  function formControlState(props, context) {
    let disabled = props.disabled;
    let error = props.error;
    let margin = props.margin;
  
    if (context.muiFormControl) {
      if (typeof disabled === 'undefined') {
        disabled = context.muiFormControl.disabled;
      }
  
      if (typeof error === 'undefined') {
        error = context.muiFormControl.error;
      }
  
      if (typeof margin === 'undefined') {
        margin = context.muiFormControl.margin;
      }
    }
  
    return {
      disabled,
      error,
      margin,
    };
  }
  
  class Input extends React.Component<ProvidedProps & Props, State> {
    static muiName = 'Input';
  
    static defaultProps = {
      disableUnderline: false,
      fullWidth: false,
      multiline: false,
      type: 'text',
    };
  
    state = {
      focused: false,
    };
  
    componentWillMount() {
      if (this.isControlled()) {
        this.checkDirty(this.props);
      }
    }
  
    componentDidMount() {
      if (!this.isControlled()) {
        this.checkDirty(this.input);
      }
    }
  
    componentWillReceiveProps(nextProps, nextContext) {
      // The blur won't fire when the disabled state is set on a focused input.
      // We need to book keep the focused state manually.
      if (
        !formControlState(this.props, this.context).disabled &&
        formControlState(nextProps, nextContext).disabled
      ) {
        this.setState({
          focused: false,
        });
      }
    }
  
    componentWillUpdate(nextProps, nextState, nextContext) {
      if (this.isControlled(nextProps)) {
        this.checkDirty(nextProps);
      } // else performed in the onChange
  
      // Book keep the focused state.
      if (
        !formControlState(this.props, this.context).disabled &&
        formControlState(nextProps, nextContext).disabled
      ) {
        const { muiFormControl } = this.context;
        if (muiFormControl && muiFormControl.onBlur) {
          muiFormControl.onBlur();
        }
      }
    }
  
    // Holds the input reference
    input = null;
  
    handleFocus = (event: SyntheticFocusEvent<>) => {
      // Fix an bug with IE11 where the focus/blur events are triggered
      // while the input is disabled.
      if (formControlState(this.props, this.context).disabled) {
        event.stopPropagation();
        return;
      }
  
      this.setState({ focused: true });
      if (this.props.onFocus) {
        this.props.onFocus(event);
      }
    };
  
    handleBlur = (event: SyntheticFocusEvent<>) => {
      this.setState({ focused: false });
      if (this.props.onBlur) {
        this.props.onBlur(event);
      }
    };
  
    handleChange = (event: SyntheticInputEvent<HTMLElement>) => {
      if (!this.isControlled()) {
        this.checkDirty(this.input);
      }
  
      // Perform in the willUpdate
      if (this.props.onChange) {
        this.props.onChange(event);
      }
    };
  
    handleRefInput = node => {
      this.input = node;
      if (this.props.inputRef) {
        this.props.inputRef(node);
      } else if (this.props.inputProps && this.props.inputProps.ref) {
        this.props.inputProps.ref(node);
      }
    };
  
    // A controlled input accepts its current value as a prop.
    //
    // @see https://facebook.github.io/react/docs/forms.html#controlled-components
    // @returns {boolean} true if string (including '') or number (including zero)
    isControlled(props = this.props) {
      return hasValue(props.value);
    }
  
    checkDirty(obj) {
      const { muiFormControl } = this.context;
  
      if (isDirty(obj)) {
        if (muiFormControl && muiFormControl.onDirty) {
          muiFormControl.onDirty();
        }
        if (this.props.onDirty) {
          this.props.onDirty();
        }
        return;
      }
  
      if (muiFormControl && muiFormControl.onClean) {
        muiFormControl.onClean();
      }
      if (this.props.onClean) {
        this.props.onClean();
      }
    }
  
    render() {
      const {
        autoComplete,
        autoFocus,
        classes,
        className: classNameProp,
        defaultValue,
        disabled: disabledProp,
        disableUnderline,
        endAdornment,
        error: errorProp,
        fullWidth,
        id,
        inputComponent,
        inputProps: { className: inputPropsClassName, ...inputPropsProp } = {},
        inputRef,
        margin: marginProp,
        multiline,
        onBlur,
        onFocus,
        onChange,
        onClean,
        onDirty,
        onKeyDown,
        onKeyUp,
        placeholder,
        name,
        readOnly,
        rows,
        rowsMax,
        startAdornment,
        type,
        value,
        ...other
      } = this.props;
  
      const { muiFormControl } = this.context;
      const { disabled, error, margin } = formControlState(this.props, this.context);
  
      const className = classNames(
        classes.root,
        {
          [classes.disabled]: disabled,
          [classes.error]: error,
          [classes.fullWidth]: fullWidth,
          [classes.focused]: this.state.focused,
          [classes.formControl]: muiFormControl,
          [classes.inkbar]: !disableUnderline,
          [classes.multiline]: multiline,
          [classes.underline]: !disableUnderline,
        },
        classNameProp,
      );
  
      const inputClassName = classNames(
        classes.input,
        {
          [classes.inputDisabled]: disabled,
          [classes.inputSingleline]: !multiline,
          [classes.inputMultiline]: multiline,
          [classes.inputSearch]: type === 'search',
          [classes.inputDense]: margin === 'dense',
        },
        inputPropsClassName,
      );
  
      const required = muiFormControl && muiFormControl.required === true;
  
      let InputComponent = 'input';
      let inputProps = {
        ...inputPropsProp,
        ref: this.handleRefInput,
      };
  
      if (inputComponent) {
        InputComponent = inputComponent;
  
        if (isMuiComponent(InputComponent, ['SelectInput'])) {
          inputProps = {
            selectRef: this.handleRefInput,
            ...inputProps,
            ref: null,
          };
        }
      } else if (multiline) {
        if (rows && !rowsMax) {
          InputComponent = 'textarea';
        } else {
          inputProps = {
            rowsMax,
            textareaRef: this.handleRefInput,
            ...inputProps,
            ref: null,
          };
          InputComponent = Textarea;
        }
      }
  
      return (
        <div onBlur={this.handleBlur} onFocus={this.handleFocus} className={className} {...other}>
          {startAdornment}
          <InputComponent
            autoComplete={autoComplete}
            autoFocus={autoFocus}
            className={inputClassName}
            onChange={this.handleChange}
            onKeyUp={onKeyUp}
            onKeyDown={onKeyDown}
            disabled={disabled}
            required={required ? true : undefined}
            value={(value: any)}
            id={id}
            name={name}
            defaultValue={defaultValue}
            placeholder={placeholder}
            type={type}
            readOnly={readOnly}
            rows={rows}
            {...inputProps}
          />
          {endAdornment}
        </div>
      );
    }
  }
  
  Input.contextTypes = {
    muiFormControl: PropTypes.object,
  };
  
  export default withStyles(styles, { name: 'MuiInput' })(Input);
  