Object.defineProperty(Array.prototype, 'shuffle', {
    value: function() {
        for (let i = this.length - 1; i > 0; i--) {
            const j = Math.floor(Math.random() * (i + 1));
            [this[i], this[j]] = [this[j], this[i]];
        }
        return this;
    }
});

(() => {
	const unit = 5

	const testmeta = document.querySelector('#testmeta')
	const chartmeta = document.querySelector('#chartmeta')
	let questionData = undefined

	const hide = (el) => {
		el.style.display = "none"
		return el
	}
	const show = (el) => {
		el.style.display = "block"
		return el
	}

	const questionTemplate = (tpl) => {
		return `
			<div class="question">
				<h3>${tpl.i + 1}. ${tpl.q}</h3>

				<div class="input" data-q="${tpl.q}">
					<label><input type="radio" name="q-${tpl.i}" value="5">&nbsp;&nbsp;${window.radios[4]}</label>
					<label><input type="radio" name="q-${tpl.i}" value="4">&nbsp;&nbsp;${window.radios[3]}</label>
					<label><input type="radio" name="q-${tpl.i}" value="3">&nbsp;&nbsp;${window.radios[2]}</label>
					<label><input type="radio" name="q-${tpl.i}" value="2">&nbsp;&nbsp;${window.radios[1]}</label>
					<label><input type="radio" name="q-${tpl.i}" value="1">&nbsp;&nbsp;${window.radios[0]}</label>
				</div>
			</div>`
	}

	const downloadResults = () => {
		var dataStr = "data:text/json;charset=utf-8," + encodeURIComponent(JSON.stringify(window.results))
		var dlAnchorElem = document.querySelector('#downloadAnchorElem')
		dlAnchorElem.setAttribute("href",  dataStr)
		dlAnchorElem.setAttribute("download", "results.json")
		dlAnchorElem.click()
	}

	const fillInRandomResults = () => {
		document.querySelectorAll('.input').forEach(d => { const r = Math.round(Math.random() * 4) + 1; d.querySelector(`input[value="${r}"]`).click(); })
		calculateResults()
	}

	const calculateResults = () => {
		const addResultsInHtml = (data) => {
			data.forEach(d => {
				const attr = d.attribute.replace(/ /g, '-')
				document.querySelector(`#result_${attr}`).innerHTML = d.score;
			})
		}

		const generateAmChart = (data) => {
			// expected data: [{attribute: "Curiosity", score: 5}]
			am4core.useTheme(am4themes_animated)
			const chart = am4core.create("chartdiv", am4charts.RadarChart)			
			chart.data = data

			const categoryAxis = chart.xAxes.push(new am4charts.CategoryAxis())
			categoryAxis.dataFields.category = "attribute"
			categoryAxis.cursorTooltipEnabled = false

			const valueAxis = chart.yAxes.push(new am4charts.ValueAxis())
			valueAxis.renderer.axisFills.template.fill = chart.colors.getIndex(2)
			valueAxis.renderer.axisFills.template.fillOpacity = 0.05
			valueAxis.min = 0
			valueAxis.max = unit

			const series = chart.series.push(new am4charts.RadarSeries())
			series.dataFields.valueY = "score"
			series.tooltipText = "[bold]{score}[/]"
			//series.fill = am4core.color('black')
			series.dataFields.categoryX = "attribute"
			series.strokeWidth = 3

			chart.cursor = new am4charts.RadarCursor()
			chart.cursor.lineY.disabled = true			
		}

		const vals = [0, 1, 2, 3, 4, 5]
		const valsInverted = [0, 5, 4, 3, 2, 1]

		const convertInputResultsToChartData = () => {
			return questionData.attributes.map((attribute, i) => {
				const calculatedQs = questionData.questions
					.filter(q => q.v.find(v => v.attribute === attribute))
					.map(q => {
						const checked = document.querySelector(`.input[data-q="${q.q}"] input:checked`)
						const value = checked ? parseInt(checked.value) : 0
						const weight = q.v.find(v => v.attribute === attribute).weight

						return {
							weight,
							question: q.q,
							value: q.invert ? valsInverted[value] : vals[value]
						}
					})
				const totalWeights = calculatedQs
					.map(calc => calc.weight * unit)
					.reduce((one, two) => one + two, 0)
				const totalScore = calculatedQs
					.map(calc => calc.weight * calc.value)
					.reduce((one, two) => one + two, 0)
				const theScore = (totalScore / (totalWeights == 0 ? 1 : totalWeights)) * unit

				return {
					attribute,
					questions: calculatedQs,
					score: (theScore === 0 ? 1 : theScore).toFixed(2)
				}
			})
		}

		if(document.querySelectorAll('input:checked').length < questionData.questions.length) {
			alert("Plese answer all questions first!")
			return
		}

		hide(testmeta)
		show(chartmeta)
		window.results = convertInputResultsToChartData()
		generateAmChart(results)
		addResultsInHtml(results)
		window.scrollTo(0, 0)
	}

	const generateQuestions = (data) => {
		questionData = data
		/* data format:
		 	attributes
		 	questions { q, v [ weight, attrIndex ] } -> totals to 100 parts
		*/
		let html = ''
		data.questions.slice().shuffle().forEach((q, i) => {
			html += questionTemplate({
				q: q.q,
				i: i
			})
		})

		document.querySelector('#test').innerHTML = html;
	}

	document.querySelector('#download').addEventListener('click', downloadResults)
	document.querySelector('#random').addEventListener('click', fillInRandomResults)
	document.querySelector('#calculate').addEventListener('click', calculateResults)
	document.querySelector('#restart').addEventListener('click', () => {
		location.reload()
	})

	fetch('data.json').then((res) => {
	  return res.json();
	}).then(generateQuestions);
})()