const React = require('react');
const Paper = require('../paper');
const StylePropable = require('../mixins/style-propable');
const CardExpandable = require('./card-expandable');

const Card = React.createClass({
  mixins:[StylePropable],

  getInitialState() {
    return { expanded: this.props.initiallyExpanded ? true : false };
  },

  propTypes: {
    style: React.PropTypes.object,
    expandable: React.PropTypes.bool,
    initiallyExpanded: React.PropTypes.bool,
    onExpandChange: React.PropTypes.func,
  },

  _onExpandable() {
    let newExpandedState = !(this.state.expanded === true);
    this.setState({expanded: newExpandedState});
    if (this.props.onExpandChange)
      this.props.onExpandChange(newExpandedState);
  },

  render() {
    let lastElement;
    let newChildren = React.Children.map(this.props.children, (currentChild) => {
      let doClone = false;
      let newChild = undefined;
      let newProps = {};
      let element = currentChild;
      if (!currentChild || !currentChild.props) {
        return null;
      }
      if (this.state.expanded === false && currentChild.props.expandable === true)
        return;
      if (currentChild.props.actAsExpander === true) {
        doClone = true;
        newProps.onTouchTap = this._onExpandable;
        newProps.style = this.mergeStyles({ cursor: 'pointer' }, currentChild.props.style);
      }
      if (currentChild.props.showExpandableButton === true) {
        doClone = true;
        newChild = <CardExpandable expanded={this.state.expanded} onExpanding={this._onExpandable}/>;
      }
      if (doClone) {
        element = React.cloneElement(currentChild, newProps, currentChild.props.children, newChild);
      }
      return element;
    }, this);

    // If the last element is text or a title we should add
    // 8px padding to the bottom of the card
    let addBottomPadding = (lastElement && (lastElement.type.displayName === "CardText" ||
      lastElement.type.displayName === "CardTitle"));
    let {
      style,
      ...other,
    } = this.props;

    let mergedStyles = this.mergeStyles({
      overflow: 'hidden',
      zIndex: 1,
    }, style);

    return (
      <Paper {...other} style={mergedStyles}>
        <div style={{paddingBottom: addBottomPadding ? 8 : 0}}>
          {newChildren}
        </div>
      </Paper>
    );
  },
});

module.exports = Card;