var React = require('react');
var joinClasses = require('./utils/joinClasses');
var classSet = require('./utils/classSet');
var cloneWithProps = require('./utils/cloneWithProps');

var ValidComponentChildren = require('./utils/ValidComponentChildren');
var createChainedFunction = require('./utils/createChainedFunction');
var BootstrapMixin = require('./BootstrapMixin');


var SubNav = React.createClass({
  mixins: [BootstrapMixin],

  propTypes: {
    onSelect: React.PropTypes.func,
    active: React.PropTypes.bool,
    disabled: React.PropTypes.bool,
    href: React.PropTypes.string,
    title: React.PropTypes.string,
    text: React.PropTypes.node,
    target: React.PropTypes.string
  },

  getDefaultProps: function () {
    return {
      bsClass: 'nav'
    };
  },

  handleClick: function (e) {
    if (this.props.onSelect) {
      e.preventDefault();

      if (!this.props.disabled) {
        this.props.onSelect(this.props.eventKey, this.props.href, this.props.target);
      }
    }
  },

  isActive: function () {
    return this.isChildActive(this);
  },

  isChildActive: function (child) {
    if (child.props.active) {
      return true;
    }

    if (this.props.activeKey != null && this.props.activeKey === child.props.eventKey) {
      return true;
    }

    if (this.props.activeHref != null && this.props.activeHref === child.props.href) {
      return true;
    }

    if (child.props.children) {
      var isActive = false;

      ValidComponentChildren.forEach(
        child.props.children,
        function (child) {
          if (this.isChildActive(child)) {
            isActive = true;
          }
        },
        this
      );

      return isActive;
    }

    return false;
  },

  getChildActiveProp: function (child) {
    if (child.props.active) {
      return true;
    }
    if (this.props.activeKey != null) {
      if (child.props.eventKey == this.props.activeKey) {
        return true;
      }
    }
    if (this.props.activeHref != null) {
      if (child.props.href === this.props.activeHref) {
        return true;
      }
    }

    return child.props.active;
  },

  render: function () {
    var classes = {
      'active': this.isActive(),
      'disabled': this.props.disabled
    };

    return (
      <li {...this.props} className={joinClasses(this.props.className, classSet(classes))}>
        <a
          href={this.props.href}
          title={this.props.title}
          target={this.props.target}
          onClick={this.handleClick}
          ref="anchor">
          {this.props.text}
        </a>
        <ul className="nav">
          {ValidComponentChildren.map(this.props.children, this.renderNavItem)}
        </ul>
      </li>
    );
  },

  renderNavItem: function (child, index) {
    return cloneWithProps(
      child,
      {
        active: this.getChildActiveProp(child),
        onSelect: createChainedFunction(child.props.onSelect, this.props.onSelect),
        ref: child.ref,
        key: child.key ? child.key : index
      }
    );
  }
});

module.exports = SubNav;