import React, { Children, Component } from 'react';
import PropTypes from 'prop-types';
import styled from 'styled-components';

export const NavIcon = () => {
  throw new Error('Should not render');
};
export const NavText = () => {
  throw new Error('Should not render');
};

const SubNavIndi = styled.div`
  position: absolute;
  right: 16px;
  bottom: 4px;
`;
const findComponent = ComponentToFind => children => {
  return Children.toArray(children).reduce((found, next) => {
    if (found === null && next !== null && next.type === ComponentToFind) {
      return next;
    }
    return found;
  }, null);
};

const findIcon = findComponent(NavIcon);
const findText = findComponent(NavText);
const identity = () => {};

const NavItemStyled = styled.div`
     padding: 8px 12px;
     cursor: pointer;
     position: relative;
     background: ${props => (props.isHighlighted ? props.highlightBgColor : 'inherit')};
     color: ${props => (props.isHighlighted ? props.highlightColor : 'inherit')};

     &:hover {
        color: ${props => props.hoverColor || props.highlightColor || 'inherit'} !important;
        background: ${props =>
          props.hoverBgColor || props.highlightBgColor || 'inherit'} !important;
     }
`;

const NavIconCont = styled.div`
    vertical-align: middle;
    display: inline-flex;
    width: 42px;
`;
const NavTextCont = styled.div`
    vertical-align: middle;
    display: inline-flex;
    padding-right: 16px;
`;

const hasChildNav = children => {
  return Children.toArray(children).reduce((partial, next) => {
    return partial === false ? next.type === Nav : partial;
  }, false);
};

const CollapsedIndicator = styled.div`
    &:before {
        border-style: solid;
        border-width: 0.15em 0.15em 0 0;
        content: '';
        display: inline-block;
        height: ${props => props.size};
        left: 0;
        position: relative;
        top: 0.15em;
        transform: rotate(${props => (!props.collapsed ? '135deg' : '45deg')});
        vertical-align: top;
        width: ${props => props.size};
    }
`;

const collectStyleAndClsName = comp => {
  const { className = undefined, style = {} } = comp && comp.props ? comp.props : {};
  return { className, style };
};

export class Nav extends Component {
  static contextTypes = {
    highlightColor: PropTypes.string,
    highlightBgColor: PropTypes.string,
    hoverBgColor: PropTypes.string,
    hoverColor: PropTypes.string,
  };

  static propTypes = {
    children: PropTypes.node,
    highlightColor: PropTypes.string,
    highlightBgColor: PropTypes.string,
    isHighlighted: PropTypes.bool,
    id: PropTypes.oneOfType([PropTypes.string.isRequired, PropTypes.number.isRequired]),
    onClick: PropTypes.func,
    onNavClick: PropTypes.func,
    highlightedId: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
    renderSubNavIndicator: PropTypes.func,
    hoverBgColor: PropTypes.string,
    hoverColor: PropTypes.string,
    expanded: PropTypes.bool,
    collapseIndicatorSize: PropTypes.string,
  };

  static defaultProps = {
    onNavClick: identity,
    collapseIndicatorSize: '0.25em',
  };

  constructor(props) {
    super(props);
    this.state = {
      collapsed: !props.expanded,
    };
  }

  onNavItemClicked = () => {
    const { onClick = identity, onNavClick } = this.props;
    this.setState(
      {
        collapsed: !this.state.collapsed,
      },
      () => {
        onNavClick(this.props.id, null);
        onClick(this.props.id, null);
        if (this.subNavEl && !this.s) {
          this.subNavEl.style.maxHeight = !this.state.collapsed ? null : '0px';
        }
      },
    );
  };

  childClicked = childId => {
    const { onNavClick } = this.props;
    onNavClick(childId, this.props.id);
    this.props.onClick(childId, this.props.id);
  };

  setSubNavRef = subNavEl => {
    this.subNavEl = subNavEl;
  };

  renderSubNavIndicator = () => {
    const { renderSubNavIndicator } = this.props;
    if (renderSubNavIndicator) {
      const subNavInd = renderSubNavIndicator(this.state.collapsed);
      if (!subNavInd && typeof console !== 'undefined') {
        console.warn('subNavIndicator returned undefined or null');
      }
      return subNavInd || null;
    }
    return (
      <CollapsedIndicator
        collapsed={this.state.collapsed}
        size={this.props.collapseIndicatorSize}
      />
    );
  };

  render() {
    const {
      hoverBgColor,
      hoverColor,
      highlightColor,
      highlightBgColor,
      children,
      highlightedId,
      onNavClick = identity,
      id,
    } = this.props;
    const icon = findIcon(children);
    const text = findText(children);
    const itemProps = {
      hoverBgColor: hoverBgColor || this.context.hoverBgColor,
      hoverColor: hoverColor || this.context.hoverColor,
      onClick: this.onNavItemClicked,
      onNavClick,
      isHighlighted: id === highlightedId,
      highlightColor: highlightColor || this.context.highlightColor,
      highlightBgColor: highlightBgColor || this.context.highlightBgColor,
    };

    return (
      <div>
        <NavItemStyled className="boldrui-sidenav___item" {...itemProps}>
          <NavIconCont {...collectStyleAndClsName(icon)}>
            {icon && icon.props ? icon.props.children : null}
          </NavIconCont>
          <NavTextCont {...collectStyleAndClsName(text)}>
            {text && text.props ? text.props.children : null}
          </NavTextCont>
          {hasChildNav(children)
            ? <SubNavIndi>
                {this.renderSubNavIndicator()}{' '}
              </SubNavIndi>
            : null}
        </NavItemStyled>
        <div
          ref={this.setSubNavRef}
          style={{
            maxHeight: this.state.collapsed ? 0 : null,
            transition: 'all 0.2s ease-in-out',
          }}
        >
          {Children.toArray(children)
            .filter(child => child.type === Nav && !this.state.collapsed)
            .map((child, idx) => {
              const sicon = findIcon(child.props.children);
              const stext = findText(child.props.children);
              const isItemHighlighted = highlightedId === `${id}/${child.props.id}`;

              return (
                <NavItemStyled
                  {...itemProps}
                  className={'boldrui-sidenav___item--child'}
                  key={idx}
                  onClick={() => {
                    child.props.onNavClick(), this.childClicked(`${id}/${child.props.id}`);
                  }}
                  isHighlighted={isItemHighlighted}
                >
                  <NavIconCont {...collectStyleAndClsName(sicon)}>
                    {null}
                  </NavIconCont>
                  <NavTextCont {...collectStyleAndClsName(stext)}>
                    {stext ? stext.props.children : null}
                  </NavTextCont>
                </NavItemStyled>
              );
            })}
        </div>
      </div>
    );
  }
}

export default Nav;