var React = require('react');
var KeyCode = require('./utils/key-code');
var Classable = require('./mixins/classable');
var UniqueId = require('./utils/unique-id');
var WindowListenable = require('./mixins/window-listenable');
var FocusRipple = require('./ripples/focus-ripple');
var TouchRipple = require('./ripples/touch-ripple');
var Paper = require('./paper');

var EnhancedSwitch = React.createClass({

  mixins: [Classable, WindowListenable],

  propTypes: {
      id: React.PropTypes.string,
      inputType: React.PropTypes.string.isRequired,
      switchElement: React.PropTypes.element.isRequired,
      iconClassName: React.PropTypes.string.isRequired,
      name: React.PropTypes.string,
      value: React.PropTypes.string,
      label: React.PropTypes.string,
      onSwitch: React.PropTypes.func,
      required: React.PropTypes.bool,
      disabled: React.PropTypes.bool,
      defaultSwitched: React.PropTypes.bool,
      labelPosition: React.PropTypes.oneOf(['left', 'right']),
      disableFocusRipple: React.PropTypes.bool,
      disableTouchRipple: React.PropTypes.bool
    },

  windowListeners: {
    'keydown': '_handleWindowKeydown',
    'keyup': '_handleWindowKeyup'
  },

  getDefaultProps: function() {
    return {
      iconClassName: ''
    };
  },

  getInitialState: function() {
    return {
      switched: this.props.defaultSwitched ||
        (this.props.valueLink && this.props.valueLink.value),
      isKeyboardFocused: false
    };
  },

  componentDidMount: function() {
    var inputNode = React.findDOMNode(this.refs.checkbox);
    this.setState({switched: inputNode.checked});
  },

  componentWillReceiveProps: function(nextProps) {
    var hasCheckedLinkProp = nextProps.hasOwnProperty('checkedLink');
    var hasCheckedProp = nextProps.hasOwnProperty('checked');
    var hasToggledProp = nextProps.hasOwnProperty('toggled');
    var hasNewDefaultProp =
      (nextProps.hasOwnProperty('defaultSwitched') &&
      (nextProps.defaultSwitched != this.props.defaultSwitched));
    var newState = {};

    if (hasCheckedProp) {
      newState.switched = nextProps.checked;
    } else if (hasToggledProp) {
      newState.switched = nextProps.toggled;
    } else if (hasCheckedLinkProp) {
      newState.switched = nextProps.checkedLink.value;
    }

    if (newState) this.setState(newState);
  },

  render: function() {
    var {
      type,
      name,
      value,
      label,
      onSwitch,
      defaultSwitched,
      onBlur,
      onFocus,
      onMouseUp,
      onMouseDown,
      onMouseOut,
      onTouchStart,
      onTouchEnd,
      disableTouchRipple,
      disableFocusRipple,
      iconClassName,
      ...other
    } = this.props;

    var classes = this.getClasses('mui-enhanced-switch', {
      'mui-is-switched': this.state.switched,
      'mui-is-disabled': this.props.disabled,
      'mui-is-required': this.props.required
    });

    var inputId = this.props.id || UniqueId.generate();

    var labelElement = this.props.label ? (
      <label className="mui-switch-label" htmlFor={inputId}>
        {this.props.label}
      </label>
    ) : null;

    var inputProps = {
      ref: "checkbox",
      type: this.props.inputType,
      name: this.props.name,
      value: this.props.value,
      defaultChecked: this.props.defaultSwitched,
      onBlur: this._handleBlur,
      onFocus: this._handleFocus,
    };

    var hideTouchRipple = this.props.disabled || disableTouchRipple;

    if(!hideTouchRipple) {
      inputProps.onMouseUp = this._handleMouseUp;
      inputProps.onMouseDown = this._handleMouseDown;
      inputProps.onMouseOut = this._handleMouseOut;
      inputProps.onTouchStart = this._handleTouchStart;
      inputProps.onTouchEnd = this._handleTouchEnd;
    }

    if (!this.props.hasOwnProperty('checkedLink')) {
      inputProps.onChange = this._handleChange;
    }

    var inputElement = (
      <input
        {...other}
        {...inputProps}
        className="mui-enhanced-switch-input"/>
    );

    var touchRipple = (
      <TouchRipple
        ref="touchRipple"
        key="touchRipple"
        centerRipple={true} />
    );

    var focusRipple = (
      <FocusRipple
        key="focusRipple"
        show={this.state.isKeyboardFocused} />
    );

    var ripples = [
      hideTouchRipple ? null : touchRipple,
      this.props.disabled || disableFocusRipple ? null : focusRipple
    ];

    iconClassName += ' mui-enhanced-switch-wrap';

    var switchElement = (this.props.iconClassName.indexOf("toggle") == -1) ? (
        <div className={iconClassName}>
          {this.props.switchElement}
          {ripples}
        </div>
      ) : (
        <div className={iconClassName}>
          <div className="mui-toggle-track" />
          <Paper className="mui-toggle-thumb" zDepth={1}> {ripples} </Paper>
        </div>
    );

    var labelPositionExist = this.props.labelPosition;

    // Position is left if not defined or invalid.
    var elementsInOrder = (labelPositionExist &&
      (this.props.labelPosition.toUpperCase() === "RIGHT")) ? (
        <div>
          {switchElement}
          {labelElement}
        </div>
      ) : (
        <div>
          {labelElement}
          {switchElement}
        </div>
    );

    return (
      <div className={classes}>
          {inputElement}
          {elementsInOrder}
      </div>
    );
  },


  isSwitched: function() {
    return React.findDOMNode(this.refs.checkbox).checked;
  },

  // no callback here because there is no event
  setSwitched: function(newSwitchedValue) {
    if (!this.props.hasOwnProperty('checked') || this.props.checked === false) {
      this.setState({switched: newSwitchedValue});
      React.findDOMNode(this.refs.checkbox).checked = newSwitchedValue;
    } else if (process.env.NODE_ENV !== 'production') {
      var message = 'Cannot call set method while checked is defined as a property.';
      console.error(message);
    }
  },

  getValue: function() {
    return React.findDOMNode(this.refs.checkbox).value;
  },

  isKeyboardFocused: function() {
    return this.state.isKeyboardFocused;
  },

  _handleChange: function(e) {

    this._tabPressed = false;
    this.setState({
      isKeyboardFocused: false
    });

    var isInputChecked = React.findDOMNode(this.refs.checkbox).checked;

    if (!this.props.hasOwnProperty('checked')) this.setState({switched: isInputChecked});
    if (this.props.onSwitch) this.props.onSwitch(e, isInputChecked);
  },

  /**
   * Because both the ripples and the checkbox input cannot share pointer
   * events, the checkbox input takes control of pointer events and calls
   * ripple animations manually.
   */

  // Checkbox inputs only use SPACE to change their state. Using ENTER will
  // update the ui but not the input.
  _handleWindowKeydown: function(e) {
    if (e.keyCode == KeyCode.TAB) this._tabPressed = true;
    if (e.keyCode == KeyCode.SPACE && this.state.isKeyboardFocused) {
      this._handleChange(e);
    }
  },

  _handleWindowKeyup: function(e) {
    if (e.keyCode == KeyCode.SPACE && this.state.isKeyboardFocused) {
      this._handleChange(e);
    }
  },

  _handleMouseDown: function(e) {
    //only listen to left clicks
    if (e.button === 0) this.refs.touchRipple.start(e);
  },

  _handleMouseUp: function(e) {
    this.refs.touchRipple.end();
  },

  _handleMouseOut: function(e) {
    this.refs.touchRipple.end();
  },

  _handleTouchStart: function(e) {
    this.refs.touchRipple.start(e);
  },

  _handleTouchEnd: function(e) {
    this.refs.touchRipple.end();
  },

  _handleBlur: function(e) {
    this.setState({
      isKeyboardFocused: false
    });

    if (this.props.onBlur) this.props.onBlur(e);
  },

  _handleFocus: function(e) {
    //setTimeout is needed becuase the focus event fires first
    //Wait so that we can capture if this was a keyboard focus
    //or touch focus
    setTimeout(function() {
      if (this._tabPressed) {
        this.setState({
          isKeyboardFocused: true
        });
      }
    }.bind(this), 150);

    if (this.props.onFocus) this.props.onFocus(e);
  }

});

module.exports = EnhancedSwitch;