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import React, { Component } from 'react';
import DataWatcher from 'components/@data-watcher';

const sortTypes = [ 'asc', 'desc' ];

@DataWatcher
class ProductsList extends Component {
    static displayName = 'ProductsList';
    static data = (props, state) => ({
        // in data dependency besides cursor path
        // we can even specify certain properties like this
        products: [
            'data',
            'products',
            'list',
            {
                sort_type: state.sortType
            }
        ],
        
        // this is the case when we need to store ui state outside the component
        selectedProductID: [
            'ui',
            'products',
            'selected'
        ]
    });

    constructor(props) {
        super(props);

        this.state = {
            sortType: sortTypes[0]
        };
    }

    // one of the data dependencies relies on state
    // so we should reload data when state changes
    _changeSort(e) {
        this.setState({
            sortType: e.target.checked ? sortTypes[1] : sortTypes[0]
        }, this._reloadData);
    }

    // we have access to the cursors of data dependencies
    // so we can actually change them right in the components
    _chooseProduct(productID) {
        this.cursors.selectedProductID.set(productID);
    }

    render() {
        const data = this.state.data.products;

        if (!data) {
            return (<div>{ 'loading...' }</div>);
        }

        return (
            <div className='products-list'>
                <div className='products-list__sort'>
                    { 'sort:' }
                    <label>
                        <input id='sort' type='checkbox'
                            checked={ this.state.sortType === sortTypes[1] }
                            onChange={ ::this._changeSort } />
                        { this.state.sortType }
                    </label>
                </div>
                <ul>
                    {
                        data.items.map(product => (
                            <li key={ product.id }>
                                <a href={ '#' + product.id } className='products-list__item'
                                    onClick={ this._chooseProduct.bind(this, product.id) }>
                                    { product.name }
                                </a>
                            </li>
                        ))
                    }
                </ul>
            </div>
        );
    }
}

export default ProductsList;