'use strict';

const {
  DragDropContext,
  Draggable,
  Droppable
} = window.ReactBeautifulDnd;

const data = window.shop_data;


const productStyle = (style, snapshot, removeAnim, hovered, selected) => {
  const custom = {
    opacity: snapshot.isDragging ? .7 : 1,
    backgroundColor: (hovered || selected) ? '#eae7f7' : 'initial',
  };

  if (!snapshot.isDropAnimating) {
    return { ...style, ...custom};
  }

  if (removeAnim) {
    // cannot be 0, but make it super tiny
    custom.transitionDuration = '0.001s';
  }

  return {
    ...style,
    ...custom,
  };
}

const cartStyle = (style, snapshot) => {
  const isDraggingOver = snapshot.isDraggingOver;
  return {
    ...style,
    ...{
      backgroundColor: isDraggingOver ? '#f2f2f2' : '#f9f9f9',
      border: isDraggingOver ? '1px dashed #ccc' : '0',
    },
  };
}

const nbrConnectorsStyle = (data) => {
  if (!data || !data.nbrCurrentSlot) {
    return {};
  }

  let p = data.nbrCurrentSlot * 100 / data.nbrSlotMax;
  if (p > 100) {
    p = 100;
  }
  return {
    width: `${p}%`,
  }
};

const nbrClocksStyle = (data) => {
  if (!data || !data.nbrCurrentClock) {
    return {};
  }

  let p = data.nbrCurrentClock * 100 / data.nbrClockMax;
  if (p > 100) {
    p = 100;
  }
  return {
    width: `${p}%`,
  }
};

const copy = (
  model,
  source,
  destination,
  droppableSource,
  droppableDestination
) => {
  const sourceClone = Array.from(source.itemIds);
  const destClone = Array.from(destination.items);
  const item = sourceClone[droppableSource.index];

  destClone.splice(droppableDestination.index, 0, {
    ...model[item],
    id: uuidv4(),
  });

  return destClone;
};

const reorder = (list, startIndex, endIndex) => {
  const result = Array.from(list);
  const [removed] = result.splice(startIndex, 1);
  result.splice(endIndex, 0, removed);

  return result;
};

const remove = (list, startIndex) => {
  const result = Array.from(list);
  result.splice(startIndex, 1);
  return result;
};

const nbrOccupiedSlotsInCrate = (items) => {
  return items.reduce((prev, next) => {
    return prev + (next.hp === 8 ? 2 : 1);
  }, 0);
};

function formatMoney(amount, decimalCount = 2, decimal = ".", thousands = ",") {
  // https://stackoverflow.com/questions/149055/how-can-i-format-numbers-as-currency-string-in-javascript
  // changes: return amount if error in order to avoid empty value
  try {
    decimalCount = Math.abs(decimalCount);
    decimalCount = isNaN(decimalCount) ? 2 : decimalCount;

    const negativeSign = amount < 0 ? "-" : "";

    let i = parseInt(amount = Math.abs(Number(amount) || 0).toFixed(decimalCount)).toString();
    let j = (i.length > 3) ? i.length % 3 : 0;

    return negativeSign + (j ? i.substr(0, j) + thousands : '') + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + thousands) + (decimalCount ? decimal + Math.abs(amount - i).toFixed(decimalCount).slice(2) : "");
  } catch (e) {
    return amount;
  }
};


/**
 * Component that provides a base layout (aside/main) for the page.
 */
class Layout extends React.PureComponent {

  static get propTypes() {
    return {
      aside: PropTypes.any,
      main: PropTypes.any,
    };
  }

  render() {
    const {
      aside,
      main,
    } = this.props;

    return (
      <div className="layout">

        <aside className="aside">{aside}</aside>

        <section className="main">{main}</section>

      </div>
    );
  }
}


/**
 * Component that renders a product.
 * Used in the aside (e.g backlog of product)
 */
class ProductItem extends React.PureComponent {

  static get propTypes() {
    return {
      id: PropTypes.string.isRequired,
      index: PropTypes.number.isRequired,
      name: PropTypes.string.isRequired,
      price: PropTypes.number.isRequired,
      currency: PropTypes.string.isRequired,
      image: PropTypes.string.isRequired,
      specs: PropTypes.array,
      onClickAddItem: PropTypes.func,
    };
  }

  constructor(props) {
    super(props);
    this.handleOnClickAddItem = this.handleOnClickAddItem.bind(this);
  }

  handleOnClickAddItem(index, e) {
    if (this.props.onClickAddItem) {
      this.props.onClickAddItem(index);
    }
    e.preventDefault();
  }

  render() {
    const {
      id,
      index,
      name,
      price,
      currency,
      image,
      specs,
    } = this.props;

    const render_specs = (specs && specs.length > 0 && (
      <ul>
        {specs.map((spec, index) =>
          <li key={index}>{spec}</li>
        )}
      </ul>
    ));

    return (
      <section className="productItem">

        <div className="content">
          <h3>{name}</h3>

          <div className="price">{`${currency} ${formatMoney(price)}`}</div>

          {render_specs}
        </div>

        <div className="content">

          <button onClick={this.handleOnClickAddItem.bind(this, index)}>
            <img src="/images/shop/icon-add.svg" alt="add" />
          </button>

          <Draggable draggableId={id} index={index}>
            {(provided, snapshot) => (
              <React.Fragment>
                <img
                    ref={provided.innerRef}
                    {...provided.draggableProps}
                    {...provided.dragHandleProps}
                    style={productStyle(
                      provided.draggableProps.style,
                      snapshot,
                      true,  // hack: remove weird animation after a drop
                    )}
                    src={image} />

                {/* Allows to simulate a clone */}
                {snapshot.isDragging && (
                  <img className="" src={image} />
                )}
              </React.Fragment>
            )}
          </Draggable>

        </div>

      </section>
    );
  }
}


/**
 * Component that renders a product.
 * Used in the crate
 */
class ProductCartItem extends React.PureComponent {

  static get propTypes() {
    return {
      hovered: PropTypes.bool,
      index: PropTypes.number.isRequired,
      model: PropTypes.object.isRequired,
      data: PropTypes.object,
      onToggleProgress: PropTypes.func,
      onToggleWarning: PropTypes.func,
      onToggleOverlayRemove: PropTypes.func,
      onClickRemoveItem: PropTypes.func,
    };
  }

  static get defaultProps() {
    return {
      hovered: false,
    };
  }

  constructor(props) {
    super(props);
    this.handleOnMouseEnterItem = this.handleOnMouseEnterItem.bind(this);
    this.handleOnMouseLeaveItem = this.handleOnMouseLeaveItem.bind(this);
    this.handleOnMouseEnterWarningItem = this.handleOnMouseEnterWarningItem.bind(this);
    this.handleOnMouseLeaveWarningItem = this.handleOnMouseLeaveWarningItem.bind(this);
    this.handleOnMouseEnterRemoveItem = this.handleOnMouseEnterRemoveItem.bind(this);
    this.handleOnMouseLeaveRemoveItem = this.handleOnMouseLeaveRemoveItem.bind(this);
    this.handleOnClickRemoveItem = this.handleOnClickRemoveItem.bind(this);
  }

  handleOnMouseEnterItem(index, e) {
    if (this.props.onToggleProgress) {
      this.props.onToggleProgress(index, true);
    }
    e.preventDefault();
  }

  handleOnMouseLeaveItem(index, e) {
    if (this.props.onToggleProgress) {
      this.props.onToggleProgress(index, false);
    }
    e.preventDefault();
  }

  handleOnMouseEnterWarningItem(index, isWarning, e) {
    if (!isWarning) {
      return;
    }
    if (this.props.onToggleWarning) {
      this.props.onToggleWarning(index, true);
    }
    e.preventDefault();
  }

  handleOnMouseLeaveWarningItem(index, isWarning, e) {
    if (!isWarning) {
      return;
    }
    if (this.props.onToggleWarning) {
      this.props.onToggleWarning(index, false);
    }
    e.preventDefault();
  }

  handleOnMouseEnterRemoveItem(index, e) {
    if (this.props.onToggleOverlayRemove) {
      this.props.onToggleOverlayRemove(index, true);
    }
    e.preventDefault();
  }

  handleOnMouseLeaveRemoveItem(index, e) {
    if (this.props.onToggleOverlayRemove) {
      this.props.onToggleOverlayRemove(index, false);
    }
    e.preventDefault();
  }

  handleOnClickRemoveItem(index, e) {
    if (this.props.onClickRemoveItem) {
      this.props.onClickRemoveItem(index);
    }
  }

  render() {
    const {
      hovered,
      model,
      data,
      index,
    } = this.props;

    let warning;
    if (data && data.warnings) {
      const warningsKeys = Object.keys(data.warnings);
      if (warningsKeys && warningsKeys.length > 0) {
        // we display only the first warning
        warning = data.warnings[warningsKeys[0]];
      }
    }

    let render_progress;
    if (model.showProgress && data) {
      switch(model.type) {
        case 'kasli':
        case 'kasli-backplane':
          render_progress = (
            <div className="k-popup-connectors">
              <p>{`${data.nbrCurrentSlot}/${model.nbrSlotMax} EEM connectors available`}</p>
              <p>{`${data.nbrCurrentClock}/${model.nbrClockMax} Clock connectors available`}</p>
            </div>
          );
          break;

        case 'zotino':
        case 'hd68':
          render_progress = (
            <div className="k-popup-connectors">
              <p>{`${data.nbrCurrentSlot}/${model.nbrSlotMax} connectors available`}</p>
            </div>
          );
          break;

        case 'clocker':
          render_progress = (
            <div className="k-popup-connectors">
              <p>{`${data.nbrCurrentClock}/${model.nbrClockMax} Clock connectors available`}</p>
            </div>
          );
          break;

        default:
          break;
      }
    }

    return (
      <Draggable draggableId={model.id} index={index}>

        {(provided, snapshot) => (
          <div
              ref={provided.innerRef}
              {...provided.draggableProps}
              {...provided.dragHandleProps}
              style={{ ...productStyle(
                provided.draggableProps.style,
                snapshot,
                true,
                hovered ? true : false,
                model.selected ? true : false,
              )}}
              onMouseEnter={this.handleOnMouseEnterRemoveItem.bind(this, index)}
              onMouseLeave={this.handleOnMouseLeaveRemoveItem.bind(this, index)}
              >

            {/* warning container */}
            <div
                style={{'height': '24px'}}
                className="progress-container warning"
                onMouseEnter={this.handleOnMouseEnterWarningItem.bind(this, index, warning)}
                onMouseLeave={this.handleOnMouseLeaveWarningItem.bind(this, index, warning)}>

              {warning && (
                <img className="alert-warning" src={warning ? `/images${warning.icon}` : null} />
              )}

              {warning && model.showWarning &&  (
                <div className="k-popup-warning">
                  <p className="rule warning">
                    <i>{warning.message}</i>
                  </p>
                </div>
              )}
            </div>

            <h6>{model.name}</h6>

            <div
              style={{'height': '250px'}}
              onMouseEnter={this.handleOnMouseEnterRemoveItem.bind(this, index)}
              >

              <img
                  className='item-cart'
                  src={`/images${model.image}`} />
            </div>

            {/* remove container */}
            <div
                style={{'display': model.showOverlayRemove ? 'flex':'none'}}
                className="overlayRemove"
                onClick={this.handleOnClickRemoveItem.bind(this, index)}>

              <img src="/images/shop/icon-remove.svg" alt="rm"/>

              <p>remove</p>
            </div>

            {/* progression container */}
            <div
                style={{'height': '22px'}}
                className="progress-container"
                onMouseEnter={this.handleOnMouseEnterItem.bind(this, index)}
                onMouseLeave={this.handleOnMouseLeaveItem.bind(this, index)}>

              {model.nbrSlotMax > 0 && (
                <div className="nbr-connectors">
                  <div style={{ ...nbrConnectorsStyle(data)}}></div>
                </div>
              )}

              {model.nbrClockMax > 0 && (
                <div className="nbr-clocks">
                  <div style={{ ...nbrClocksStyle(data)}}></div>
                </div>
              )}

              {/* progress info when mouse over */}
              {render_progress}
            </div>

          </div>
        )}

      </Draggable>
    );
  }
}


/**
 * Component that displays a placeholder inside crate.
 * Allows to display how it remains space for the current crate.
 */
class FakePlaceholder extends React.PureComponent {

  static get propTypes() {
    return {
      isDraggingOver: PropTypes.bool,
      nbrSlots: PropTypes.number.isRequired,
      items: PropTypes.array.isRequired,
    };
  }

  render() {
    const {
      isDraggingOver,
      nbrSlots,
      items,
    } = this.props;

    const fakePlaceholder = [];
    const nbrOccupied = nbrOccupiedSlotsInCrate(items);

    for (var i = (nbrSlots - nbrOccupied); i > 0; i--) {
      fakePlaceholder.push(
        <div key={i} style={{
          display: isDraggingOver ? 'none' : 'block',
          border: '1px dashed #ccc',
          width: '45px',
          marginBottom: '5px',
        }}></div>
      );
    }

    return (
      <React.Fragment>
        {fakePlaceholder}
      </React.Fragment>
    );

  }
}


/**
 * Component that displays a list of <ProductCartItem>
 */
class Cart extends React.PureComponent {

  static get propTypes() {
    return {
      nbrSlots: PropTypes.number,
      itemHovered: PropTypes.string,
      data: PropTypes.object.isRequired,
      onToggleProgress: PropTypes.func,
      onToggleWarning: PropTypes.func,
      onToggleOverlayRemove: PropTypes.func,
      onClickRemoveItem: PropTypes.func,
    };
  }

  render() {
    const {
      nbrSlots,
      itemHovered,
      data,
      onToggleProgress,
      onToggleWarning,
      onToggleOverlayRemove,
      onClickRemoveItem,
    } = this.props;

    const products = data.items.map((item, index) => {
      let itemData;
      if (data.itemsData && index in data.itemsData) {
        itemData = data.itemsData[index];
      }
      return (
        <ProductCartItem
            hovered={item.id === itemHovered}
            key={item.id}
            index={index}
            data={itemData}
            onToggleProgress={onToggleProgress}
            onToggleWarning={onToggleWarning}
            onToggleOverlayRemove={onToggleOverlayRemove}
            onClickRemoveItem={onClickRemoveItem}
            model={item}>
        </ProductCartItem>
      );
    });

    return (
      <Droppable droppableId={data.id} direction="horizontal">

        {(provided, snapshot) => (
          <div
              ref={provided.innerRef}
              {...provided.droppableProps}
              style={cartStyle(
                provided.droppableProps.style,
                snapshot,
              )}
              className="items-cart-list">

            {products}

            {provided.placeholder && (
              <div style={{ display: 'none' }}>
                {provided.placeholder}
              </div>
            )}

            <FakePlaceholder
                nbrSlots={nbrSlots}
                items={data.items}
                isDraggingOver={snapshot.isDraggingOver} />
          </div>
        )}

      </Droppable>
    );
  }
}


/**
 * Component that displays crate modes
 */
class CrateMode extends React.PureComponent {

  static get propTypes() {
    return {
      items: PropTypes.array.isRequired,
      mode: PropTypes.string.isRequired,
      onClickMode: PropTypes.func,
    };
  }

  constructor(props) {
    super(props);
    this.handleOnClickMode = this.handleOnClickMode.bind(this);
  }

  handleOnClickMode(mode, e) {
    if (this.props.onClickMode) {
      this.props.onClickMode(mode);
    }
    e.preventDefault();
  }

  render() {
    const {
      mode,
      items,
    } = this.props;

    return (
      <div className="crate-mode">
        {items.map(item => (
          <a
            key={item.id}
            className={mode == item.id ? 'active' : ''}
            onClick={this.handleOnClickMode.bind(this, item.id)}
            href="#"
            role="button">{item.name}</a>
        ))}
      </div>
    );
  }
}


/**
 * Component that displays the main crate with reminder rules.
 * It includes <Cart> and rules
 */
class Crate extends React.PureComponent {

  static get propTypes() {
    return {
      rules: PropTypes.array,
      cart: PropTypes.element,
    };
  }

  render() {
    const {
      rules,
      cart,
    } = this.props;

    return (
      <div className="crate">

        <div className="crate-products">

          {cart}

          {rules && rules.length > 0 && (
            <div className="crate-info">
              {rules.map((rule, index) => (
                <p key={index} className="rule" style={{'color': rule.color ? rule.color : 'inherit'}}>
                  <img src={`/images${rule.icon}`} /> <i><strong>{rule.name}:</strong> {rule.message}</i>
                </p>
              ))}
            </div>
          )}
        </div>

      </div>
    );
  }
}


/**
 * Component that renders all things for order.
 * It acts like-a layout, this component do nothing more.
 */
class OrderPanel extends React.PureComponent {

  static get propTypes() {
    return {
      title: PropTypes.string,
      description: PropTypes.string,
      crateMode: PropTypes.element,
      crate: PropTypes.element,
      summaryPrice: PropTypes.element,
      form: PropTypes.element,
    };
  }

  render() {
    const {
      title,
      description,
      crateMode,
      crate,
      summaryPrice,
      form,
    } = this.props;

    return (
      <section className="panel">

        <h2>{title}</h2>

        <div className="control">
          <p className="description">{description}</p>

          {crateMode}
        </div>

        {crate}

        <section className="summary">
          {summaryPrice}

          {form}
        </section>

      </section>
    );
  }
}


/**
 * Components that renders the form to request quote.
 */
class OrderForm extends React.PureComponent {

  static get propTypes() {
    return {
      onClickSubmit: PropTypes.func,
    };
  }

  constructor(props) {
    super(props);
    this.state = {note: ''};

    this.handleNoteChange = this.handleNoteChange.bind(this);
    this.handleSubmit = this.handleSubmit.bind(this);
  }

  handleNoteChange(event) {
    this.setState({
      note: event.target.value,
    });
  }

  handleSubmit(event) {
    if (this.props.onClickSubmit) {
      this.props.onClickSubmit(this.state.note);
    }
    event.preventDefault();
  }

  render() {
    return (
      <div className="summary-form">

        <form onSubmit={this.handleSubmit}>
          <textarea
              value={this.state.note}
              onChange={this.handleNoteChange}
              rows="5"
              placeholder="Additional notes" />
          <input type="submit" value="Request quote" />
        </form>

      </div>
    );
  }
}


/**
 * Components that displays the list of card that are used in the crate.
 * It is a summary of purchase
 */
class OrderSumary extends React.PureComponent {

  static get propTypes() {
    return {
      currency: PropTypes.string,
      modes: PropTypes.array,
      currentMode: PropTypes.string,
      summary: PropTypes.array,
      itemsData: PropTypes.array,
      onDeleteItem: PropTypes.func,
      onDeleteAllItems: PropTypes.func,
      onMouseEnterItem: PropTypes.func,
      onMouseLeaveItem: PropTypes.func,
      onClickSelectItem: PropTypes.func,
    };
  }

  constructor(props) {
    super(props);
    this.handleOnDeleteItem = this.handleOnDeleteItem.bind(this);
    this.handleOnDeleteAllItems = this.handleOnDeleteAllItems.bind(this);
    this.handleOnMouseEnterItem = this.handleOnMouseEnterItem.bind(this);
    this.handleOnMouseLeaveItem = this.handleOnMouseLeaveItem.bind(this);
    this.handleOnClickSelectItem = this.handleOnClickSelectItem.bind(this);
  }

  handleOnDeleteItem(index, e) {
    if (this.props.onDeleteItem) {
      this.props.onDeleteItem(index);
    }
    e.preventDefault();
  }

  handleOnDeleteAllItems(e) {
    if (this.props.onDeleteAllItems) {
      this.props.onDeleteAllItems();
    }
    e.preventDefault();
  }

  handleOnMouseEnterItem(id, e) {
    if (this.props.onMouseEnterItem) {
      this.props.onMouseEnterItem(id);
    }
    e.preventDefault();
  }

  handleOnMouseLeaveItem(e) {
    if (this.props.onMouseLeaveItem) {
      this.props.onMouseLeaveItem();
    }
    e.preventDefault();
  }

  handleOnClickSelectItem(index, e) {
    if (e.target.tagName !== 'IMG') {
      if (this.props.onClickSelectItem) {
        this.props.onClickSelectItem(index);
      }
    }
    return e.preventDefault();
  }

  render() {
    const {
      currency,
      modes,
      currentMode,
      summary,
      itemsData,
    } = this.props;

    const mode = modes.find(elem => elem.id === currentMode);

    return (
      <div className="summary-price">

        <table>

          <thead>
            <tr>
              <td colSpan="2" className="summary-remove-all">
                <span className="item-card-name">Remove all cards</span>

                <button onClick={this.handleOnDeleteAllItems}>
                  <img src="/images/shop/icon-remove.svg" />
                </button>
              </td>
            </tr>

            {mode && (
              <tr>
                <td className="item-card-name">{mode.name}</td>
                <td className="price">
                  <div>
                    {`${currency} ${formatMoney(mode.price)}`}

                    <button style={{'opacity': '0', 'cursor': 'initial'}}>
                      <img src="/images/shop/icon-remove.svg" />
                    </button>
                  </div>

                  <span style={{
                    'display': 'inline-block',
                    'width': '30px',
                  }}>&nbsp;</span>
                </td>
              </tr>
            )}
          </thead>

          <tbody>
            {summary.map((item, index) => {
              let alert;
              let warning;

              if (itemsData[index]) {
                alert = itemsData[index];
                const warningsKeys = Object.keys(alert.warnings);
                if (warningsKeys && warningsKeys.length > 0) {
                  warning = alert.warnings[warningsKeys[0]];
                }
              }

              return (
                <tr key={item.id}
                    className={`hoverable ${item.selected ? 'selected' : ''}`}
                    onClick={this.handleOnClickSelectItem.bind(this, index)}
                    onMouseEnter={this.handleOnMouseEnterItem.bind(this, item.id)}
                    onMouseLeave={this.handleOnMouseLeaveItem}>

                  <td className="item-card-name">
                    <div>{item.name}</div>
                  </td>

                  <td className="price">
                    <div>
                      {`${currency} ${formatMoney(item.price)}`}

                      <button onClick={this.handleOnDeleteItem.bind(this, index)}>
                        <img src="/images/shop/icon-remove.svg" />
                      </button>
                    </div>

                    {warning && (
                      <img
                          style={{'marginLeft': '10px'}}
                          className="alert-warning"
                          src={`/images/${warning.icon}`}
                      />
                    )}

                    {!warning && (
                      <span style={{
                        'display': 'inline-block',
                        'width': '30px',
                      }}>&nbsp;</span>
                    )}
                  </td>
                </tr>
              );
            })}
          </tbody>

          <tfoot>
            <tr>
              <td className="item-card-name">Price estimate</td>
              <td className="price">
                <div>
                  {summary.length ? (
                    `${currency} ${formatMoney(summary.reduce(
                      (prev, next) => {
                        return prev + next.price;
                      }, 0
                    ) + mode.price)}`
                  ) : (
                    `${currency} ${formatMoney(mode.price)}`
                  )}

                  <button style={{'opacity': '0', 'cursor': 'initial'}}>
                    <img src="/images/shop/icon-remove.svg" alt="icon remove"/>
                  </button>
                </div>

                <span style={{
                  'display': 'inline-block',
                  'width': '30px',
                }}>&nbsp;</span>
              </td>
            </tr>
          </tfoot>

        </table>

      </div>
    );
  }
}


/**
 * Component that renders the backlog in the aside
 */
class Backlog extends React.PureComponent {

  static get propTypes() {
    return {
      currency: PropTypes.string,
      data: PropTypes.object.isRequired,
      items: PropTypes.object,
      onClickAddItem: PropTypes.func,
    };
  }

  static get defaultProps() {
    return {
      items: {},
    };
  }

  render() {
    const {
      currency,
      data,
      items,
      onClickAddItem,
    } = this.props;

    const ordered_items = data.itemIds.map(itemId => items[itemId]);
    const products = ordered_items.map((item, index) => {
      return (
        <ProductItem
            key={item.id}
            id={item.id}
            index={index}
            name={item.name}
            price={item.price}
            currency={currency}
            image={`/images/${item.image}`}
            specs={item.specs}
            onClickAddItem={onClickAddItem}
        ></ProductItem>
      );
    });

    return (
      <Droppable
          droppableId={data.id}
          isDropDisabled={true}>

        {(provided) => (
          <div
              className="backlog-container"
              ref={provided.innerRef}
              {...provided.droppableProps}>

            {products}

            {provided.placeholder && (
              <div style={{ display: 'none' }}>
                {provided.placeholder}
              </div>
            )}
          </div>
        )}

      </Droppable>
    );
  }
}


/**
 * Component that render the entire shop
 */
class Shop extends React.PureComponent {

  static get propTypes() {
    return {
      data: PropTypes.object.isRequired,
    };
  }

  constructor(props) {
    super(props);
    this.state = this.props.data;
    this.handleCrateModeChange = this.handleCrateModeChange.bind(this);
    this.handleOnDragEnd = this.handleOnDragEnd.bind(this);
    this.handleDeleteItem = this.handleDeleteItem.bind(this);
    this.handleDeleteAllItems = this.handleDeleteAllItems.bind(this);
    this.handleMouseEnterItem = this.handleMouseEnterItem.bind(this);
    this.handleMouseLeaveItem = this.handleMouseLeaveItem.bind(this);
    this.handleClickAddItem = this.handleClickAddItem.bind(this);
    this.checkAlerts = this.checkAlerts.bind(this);
    this.handleToggleItemProgress = this.handleToggleItemProgress.bind(this);
    this.handleToggleItemWarning = this.handleToggleItemWarning.bind(this);
    this.handleClickSelectItem = this.handleClickSelectItem.bind(this);
    this.handleClickSubmit = this.handleClickSubmit.bind(this);
    this.handleToggleOverlayRemove = this.handleToggleOverlayRemove.bind(this);
  }

  componentDidMount() {
    // index 0 is a Kasli, we place it as a default conf on the crate.
    const source = {
      droppableId: 'backlog',
      index: 0,
    };
    const destination = {
      droppableId: 'cart',
      index: 0,
    };

    this.handleOnDragEnd({
      source,
      destination,
      draggableId: null,
    });
  }

  componentDidUpdate(prevProps, prevState) {
    /**
     * We check alerts (reminder + warning) only when items inside crate or
     * crate mode change.
     *
     * In the function checkAlerts, we DO NOT want to change items as we will
     * trigger again this function (componentDidUpdate) and thus,
     * making an infinite loop.
     */
    if (
      (prevState.columns.cart.items !== this.state.columns.cart.items) ||
      (prevState.currentMode !== this.state.currentMode)
    ) {
      this.checkAlerts(
        prevState.columns.cart.items,
        this.state.columns.cart.items);
    }
  }

  handleCrateModeChange(mode) {
    this.setState({
      currentMode: mode,
    });
  }

  handleDeleteItem(index) {
    const cloned = Array.from(this.state.columns.cart.items);
    cloned.splice(index, 1);
    this.setState({
      ...this.state,
      columns: {
        ...this.state.columns,
        cart: {
          ...this.state.columns.cart,
          items: cloned,
        },
      },
    });
  }

  handleDeleteAllItems() {
    this.setState({
      ...this.state,
      columns: {
        ...this.state.columns,
        cart: {
          ...this.state.columns.cart,
          items: [],
        },
      },
    });
  }

  handleMouseEnterItem(id) {
    this.setState({
      ...this.state,
      currentItemHovered: id,
    });
  }

  handleMouseLeaveItem() {
    this.setState({
      ...this.state,
      currentItemHovered: null,
    });
  }

  handleClickAddItem(index) {
    const source = {
      droppableId: 'backlog',
      index: index,
    };
    const destination = {
      droppableId: 'cart',
      index: this.state.columns.cart.items.length,
    };

    this.handleOnDragEnd({
      source,
      destination,
      draggableId: null,
    });
  }

  handleToggleItemProgress(index, show) {
    const itemsCloned = Array.from(this.state.columns.cart.items);

    this.setState({
      ...this.state,
      columns: {
        ...this.state.columns,
        cart: {
          ...this.state.columns.cart,
          items: itemsCloned.map((item, i) => {
            return {
              ...item,
              showProgress: i === index ? show : false,
              showOverlayRemove: false,
              showWarning: false,
            };
          }),
        }
      },
    });
  }

  handleToggleItemWarning(index, show) {
    const itemsCloned = Array.from(this.state.columns.cart.items);

    this.setState({
      ...this.state,
      columns: {
        ...this.state.columns,
        cart: {
          ...this.state.columns.cart,
          items: itemsCloned.map((item, i) => {
            return {
              ...item,
              showWarning: i === index ? show : false,
              showProgress: false,
              showOverlayRemove: false,
            };
          }),
        }
      },
    });
  }

  handleClickSelectItem(index) {
    const itemsCloned = Array.from(this.state.columns.cart.items);

    this.setState({
      ...this.state,
      columns: {
        ...this.state.columns,
        cart: {
          ...this.state.columns.cart,
          items: itemsCloned.map((item, id) => {
            return {...item, selected: id === index ? true : false};
          }),
        }
      },
    });
  }

  handleToggleOverlayRemove(index, show) {
    const itemsCloned = Array.from(this.state.columns.cart.items);

    this.setState({
      ...this.state,
      columns: {
        ...this.state.columns,
        cart: {
          ...this.state.columns.cart,
          items: itemsCloned.map((item, id) => {
            return {
              ...item,
              showOverlayRemove: id === index ? show : false,
              showProgress: false,
              showWarning: false,
            };
          }),
        }
      },
    });
  }

  handleClickSubmit(note) {
    const crate = {
      items: [],
      type: this.state.currentMode,
    };
    const clonedCart = Array.from(this.state.columns.cart.items);
    for (const i in clonedCart) {
      const item = clonedCart[i];
      crate.items.push({
        'name': item.name,
      });
    }

    const a = document.createElement('a');
    const num = (new Date()).getTime();
    const subject = `[Order hardware] - Request Quote`;
    let body = `Hello!\n\nI would like to request a quotation for my below configuration:\n\n${JSON.stringify(crate)}\n\n`;

    if (note) {
      body = `${body}\n\nAdditional note:\n\n${note ? note.trim() : ''}`;
    }

    document.body.appendChild(a);

    a.style = 'display: none';
    a.href = `mailto:sales@m-labs.hk?subject=${subject}&body=${encodeURIComponent(body)}`;
    a.click();
  }

  handleOnDragEnd(result) {
    const {
      source,
      destination,
      draggableId,
    } = result;

    if (!destination) {
      if (source.droppableId === 'cart') {
        this.setState({
          ...this.state,
          columns: {
            ...this.state.columns,
            [source.droppableId]: {
              ...this.state.columns[source.droppableId],
              items: remove(
                this.state.columns[source.droppableId].items,
                source.index,
              ),
            },
          },
        });
      }

      return;
    }

    switch(source.droppableId) {

      case 'backlog':
        this.setState({
          ...this.state,
          columns: {
            ...this.state.columns,
            [destination.droppableId]: {
              ...this.state.columns[destination.droppableId],
              items: copy(
                this.state.items,
                this.state.columns[source.droppableId],
                this.state.columns[destination.droppableId],
                source,
                destination,
              ),
            },
          },
        });
        break;

      case destination.droppableId:
        this.setState({
          ...this.state,
          columns: {
            ...this.state.columns,
            [destination.droppableId]: {
              ...this.state.columns[destination.droppableId],
              items: reorder(
                this.state.columns[destination.droppableId].items,
                source.index,
                destination.index,
              ),
            },
          },
        });
        break;

      default:
        break;
    }
  }

  checkAlerts(prevItems, newItems) {
    console.log('--- START CHECKING CRATE WARNING ---');

    const {
      currentMode,
      crateModeSlots,
      crateRules,
    } = this.state;

    const itemsCloned = Array.from(newItems);
    const itemsData = {};
    const rules = {};


    // check number of slot in crate
    const nbrOccupied = nbrOccupiedSlotsInCrate(newItems);
    if (nbrOccupied > crateModeSlots[currentMode]) {
      rules[crateRules.maxSlot.type] = {...crateRules.maxSlot};
    }


    // check the number of EEM connectors available for all Kasli
    const idxK = itemsCloned.reduce((prev, next, i) => {
      if (next.type === 'kasli' || next.type === 'kasli-backplane') {
        prev.push(i);
      }
      return prev;
    }, []);
    for (let i = 0; i <= idxK.length - 1; i++) {
      let slots;
      let nbUsedSlot = 0;
      let nbrCurrentClock = 0;
      let idx = idxK[i];

      if (i !== idxK.length - 1) {
        slots = itemsCloned.slice(idx + 1, idxK[i + 1]);
      } else {
        slots = itemsCloned.slice(idx + 1);
      }

      if (i == 0) {
        const slots_need_resource = itemsCloned.slice(0, idx);
        const idx_need = slots_need_resource.findIndex(e => (e.rules && e.rules.resources));

        if (idx_need != -1) {
          if (idx_need in itemsData) {
            if ('warnings' in itemsData[idx_need]) {
              itemsData[idx_need].warnings.resources = {...itemsCloned[idx_need].rules.resources};
            } else {
              itemsData[idx_need].warnings = {};
              itemsData[idx_need].warnings.resources = {...itemsCloned[idx_need].rules.resources};
            }
          } else {
            itemsData[idx_need] = {...itemsCloned[idx_need]};
            itemsData[idx_need].warnings = {};
            itemsData[idx_need].warnings.resources = {...itemsCloned[idx_need].rules.resources};
          }
        }
      }

      nbUsedSlot = slots
        .filter(item => item.type !== 'idc-bnc')
        .reduce((prev, next) => {
          return prev + next.slotOccupied;
        }, 0);
      nbrCurrentClock = slots
        .reduce((prev, next) => {
          return next.type === 'clocker' ? prev + next.clockOccupied : prev;
        }, 0);

      if (idx in itemsData) {
        itemsData[idx].nbrCurrentSlot = nbUsedSlot;
        itemsData[idx].nbrCurrentClock = nbrCurrentClock;
        if (!('warnings' in itemsData[idx])) {
          itemsData[idx].warnings = {};
        }
      } else {
        itemsData[idx] = {...itemsCloned[idx]};
        itemsData[idx].nbrCurrentSlot = nbUsedSlot;
        itemsData[idx].nbrCurrentClock = nbrCurrentClock;
        itemsData[idx].warnings = {};
      }

      if (nbUsedSlot > itemsCloned[idx].nbrSlotMax) {
        rules[itemsCloned[idx].rules.maxSlot.type] = {...itemsCloned[idx].rules.maxSlot};
        itemsData[idx].warnings.maxSlotWarning = {...itemsCloned[idx].rules.maxSlotWarning};
      }

      if (nbrCurrentClock > itemsCloned[idx].nbrClockMax) {
        rules[itemsCloned[idx].rules.maxClock.type] = {...itemsCloned[idx].rules.maxClock};
        itemsData[idx].warnings.maxClockWarning = {...itemsCloned[idx].rules.maxClockWarning};
      }

      if (itemsCloned.length > (idx + 1)) {
        const ddkali = itemsCloned[idx + 1];
        if (ddkali.type === 'kasli' || ddkali.type === 'kasli-backplane') {
          rules[ddkali.rules.follow.type] = {...ddkali.rules.follow};
        }
      }
    }


    // check number of clock connector available
    const idxC = itemsCloned.reduce((prev, next, i) => {
      if (next.type === 'kasli' || next.type === 'kasli-backplane' || next.type === 'clocker') {
        prev.push(i);
      }
      return prev;
    }, []);
    for (let i = 0; i <= idxC.length - 1; i++) {
      let slots;
      let nbrCurrentClock = 0;
      let idx = idxC[i];

      if (i !== idxC.length - 1) {
        slots = itemsCloned.slice(idx + 1, idxC[i + 1]);
      } else {
        slots = itemsCloned.slice(idx + 1);
      }

      nbrCurrentClock = slots.reduce((prev, next) => {
        return prev + next.clockOccupied;
      }, 0);

      if (idx in itemsData) {
        if (itemsData[idx].nbrCurrentClock) {
          itemsData[idx].nbrCurrentClock += nbrCurrentClock;
        } else {
          itemsData[idx].nbrCurrentClock = nbrCurrentClock;
        }
      } else {
        itemsData[idx] = {...itemsCloned[idx]};
        itemsData[idx].nbrCurrentClock = nbrCurrentClock;
        itemsData[idx].warnings = {};
      }

      if (nbrCurrentClock > itemsCloned[idx].nbrClockMax) {
        rules[itemsCloned[idx].rules.maxClock.type] = {...itemsCloned[idx].rules.maxClock};
        itemsData[idx].warnings.maxClockWarning = {...itemsCloned[idx].rules.maxClockWarning};
      }
    }


    // check for number of recommanded EEM connectors
    ['novo', 'urukul', 'koster'].map(_type => {
      if (itemsCloned.find(elem => elem.type === _type)) {
        rules[this.state.items[_type].rules.connectors.type] = {...this.state.items[_type].rules.connectors};
      }
      return _type;
    });


    // check if IDC-BNC is correctly positionned (after Zotino or HD68)
    const idxIDCBNC = itemsCloned.reduce((prev, next, i) => {
      if (next.type === 'idc-bnc') {
        prev.push(i);
      }
      return prev;
    }, []);
    for (var i = idxIDCBNC.length - 1; i >= 0; i--) {
      const ce = idxIDCBNC[i];
      let shouldWarning = false;

      if (ce == 0) {
        shouldWarning = true;
      } else if (ce >= 1) {
        const pe = idxIDCBNC[i] - 1;
        if (itemsCloned[pe].type !== 'zotino' &&
            itemsCloned[pe].type !== 'hd68' &&
            itemsCloned[pe].type !== 'idc-bnc') {
          shouldWarning = true;
        }
      }

      if (shouldWarning) {
        itemsData[ce] = {...itemsCloned[ce]};
        itemsData[ce].warnings = {};
        itemsData[ce].warnings.wrong = {...itemsCloned[ce].rules.wrong};
      }
    }


    // check number of IDC-BNC adapters for a Zotino and HD68-IDC
    const idxZH = itemsCloned.reduce((prev, next, i) => {
      if (next.type === 'zotino' || next.type === 'hd68') {
        prev.push(i);
      }
      return prev;
    }, []);
    for (let i = 0; i <= idxZH.length - 1; i++) {
      let slots;
      let nbUsedSlot = 0;
      let idx = idxZH[i];

      if (i !== idxZH.length - 1) {
        slots = itemsCloned.slice(idx + 1, idxZH[i + 1]);
      } else {
        slots = itemsCloned.slice(idx + 1);
      }

      let stopCount = false;
      nbUsedSlot = slots.reduce((prev, next, ci, ca) => {
        if (ci === 0 && next.type === 'idc-bnc') {
          return prev + 1;
        } else if (ca[0].type === 'idc-bnc' && ci > 0 && ca[ci - 1].type === 'idc-bnc') {
          if (next.type !== 'idc-bnc') { stopCount = true; }
          return prev + (next.type === 'idc-bnc' && !stopCount ? 1 : 0);
        }
        return prev;
      }, 0);

      if (idx in itemsData) {
        itemsData[idx].nbrCurrentSlot = nbUsedSlot;
        if (!('warnings' in itemsData[idx])) {
          itemsData[idx].warnings = {};
        }
      } else {
        itemsData[idx] = {...itemsCloned[idx]};
        itemsData[idx].nbrCurrentSlot = nbUsedSlot;
        itemsData[idx].warnings = {};
      }

      if (nbUsedSlot > 0) {
        rules[itemsCloned[idx].rules.maxSlot.type] = {...itemsCloned[idx].rules.maxSlot};
      }
      if (nbUsedSlot > itemsCloned[idx].nbrSlotMax) {
        itemsData[idx].warnings.maxSlotWarning = {...itemsCloned[idx].rules.maxSlotWarning};
      }

      // check if HD68-IDC has at least 1 IDC-BNC adapter
      if (itemsCloned[idx].type === 'hd68') {
        let shouldWarning = false;

        if (idx < itemsCloned.length - 1) {
          if (itemsCloned[idx + 1].type !== 'idc-bnc') {
            shouldWarning = true;
          }
        } else if (idx === itemsCloned.length - 1) {
          shouldWarning = true;
        }

        if (shouldWarning) {
          if (idx in itemsData) {
            itemsData[idx].warnings.minAdapter = {...itemsCloned[idx].rules.minAdapter};
          } else {
            itemsData[idx] = {...itemsCloned[idx]};
            itemsData[idx].warnings = {};
            itemsData[idx].warnings.minAdapter = {...itemsCloned[idx].rules.minAdapter};
          }
        }
      }
    }


    // update state with rules
    this.setState({
      ...this.state,
      columns: {
        ...this.state.columns,
        cart: {
          ...this.state.columns.cart,
          itemsData: {
            ...itemsData,
          },
        }
      },
      rules: {
        ...rules,
      },
    });
  }

  render() {

    const {
      currency,
      currentItemHovered,
      currentMode,
      crateModeSlots,
      crateModeItems,
      items,
      columns,
      rules,
    } = this.state;

    return (
      <DragDropContext onDragEnd={this.handleOnDragEnd}>

        <Layout
            className="shop"
            aside={
              <Backlog
                  currency={currency}
                  items={items}
                  data={columns['backlog']}
                  onClickAddItem={this.handleClickAddItem}>
              </Backlog>
            }
            main={(
              <OrderPanel
                  title="Order hardware"
                  description="
                    Drag and drop the cards you want into the crate below to see how the combination would look like. If you have any issues with this ordering system, or if you need other configurations, email us directly anytime at sales@m-****.hk. The price is estimated and must be confirmed by a quote."
                  crateMode={
                    <CrateMode
                        items={crateModeItems}
                        mode={currentMode}
                        onClickMode={this.handleCrateModeChange}>
                    </CrateMode>}
                  crate={
                    <Crate
                        cart={
                          <Cart
                              nbrSlots={crateModeSlots[currentMode]}
                              data={columns['cart']}
                              itemHovered={currentItemHovered}
                              onToggleProgress={this.handleToggleItemProgress}
                              onToggleWarning={this.handleToggleItemWarning}
                              onToggleOverlayRemove={this.handleToggleOverlayRemove}
                              onClickRemoveItem={this.handleDeleteItem}>
                          </Cart>
                        }
                        rules={Object.values(rules).filter(rule => rule)}>
                    </Crate>
                  }
                  summaryPrice={
                    <OrderSumary
                        currency={currency}
                        currentMode={currentMode}
                        modes={crateModeItems}
                        summary={columns['cart'].items}
                        itemsData={columns.cart.itemsData}
                        onMouseEnterItem={this.handleMouseEnterItem}
                        onMouseLeaveItem={this.handleMouseLeaveItem}
                        onDeleteItem={this.handleDeleteItem}
                        onDeleteAllItems={this.handleDeleteAllItems}
                        onClickSelectItem={this.handleClickSelectItem}>
                    </OrderSumary>
                  }
                  form={
                    <OrderForm
                        onClickSubmit={this.handleClickSubmit}>
                    </OrderForm>
                  }>
              </OrderPanel>
            )}>
        </Layout>

      </DragDropContext>
    );
  }
}


ReactDOM.render(
  <Shop data={data} />,
  document.querySelector('#root-shop'),
);