define([
    'lodash',
    'jquery',
    'react',
    'ImageSearch.rt'
], function (_, $, React, template) {
    'use strict'

    var ImageSearch = React.createClass({

        displayName: 'ImageSearch',
        mixins: [React.addons.LinkedStateMixin],

        seq: 0,
        total: 0,
        hasMore: true,
        heights: [0, 0, 0],
        realTerm: 'cats',

        getInitialState: function () {
            setTimeout(this.search, 0)
            return {
                searchTerm: this.realTerm,
                items: [[], [], []]
            }
        },

        search: function () {
            this.state.items = [[], [], []]
            this.total = 0
            this.heights = [0, 0, 0]
            this.hasMore = true
            this.realTerm = this.state.searchTerm
            this.loadMore()
        },

        indexOfMin: function (array) {
            var indexAndMin = _.reduce(array, function (accum, height, index) {
                /*eslint no-extra-parens:0*/
                return (height < accum.min) ? {i: index, min: height} : accum
            }, {i: -1, min: Number.MAX_VALUE})
            return indexAndMin.i
        },

        loadMore: function (done) {
            done = done || _.noop
            if (!this.hasMore) {
                done()
                return
            }
            var url = 'https://ajax.googleapis.com/ajax/services/search/images?v=1.0&rsz=8&start=' + this.total + '&q=' + this.realTerm + '&callback=?'

            var self = this
            $.ajax({url: url, dataType: 'jsonp'})
                .done(function (data) {
                    if (!data.responseData) {
                        self.hasMore = false
                        done()
                        return
                    }
                    var results = data.responseData.results
                    var items = _.cloneDeep(self.state.items)
                    results.forEach(function (result) {
                        var minHeightIndex = self.indexOfMin(self.heights)

                        items[minHeightIndex].push({
                            id: self.seq + 1,
                            title: result.titleNoFormatting,
                            url: result.url,
                            ratio: result.width / result.height,
                            originalContext: result.originalContextUrl
                        })

                        self.heights[minHeightIndex] += result.height / result.width
                        self.total++
                        self.seq++
                    })

                    self.setState({items: items})
                    done()
                })
        },

        shouldComponentUpdate: function (nextProps, nextState) {
            return !_.isEqual(this.state, nextState)
        },

        render: function () {
            return template.apply(this)
        }
    })

    return ImageSearch
})