import './GraphTest.html';
import d3 from 'd3';

let SalesTotals = new Meteor.Collection(null);

function changeData() {
	if(SalesTotals.find({}).count() > 0) {
		let sales = SalesTotals.find({}).fetch();
		
		for(let sale of sales) {
			SalesTotals.update(sale._id, {$set: {year: sale.year, total: Math.round(Math.random() * 10000) / 100}});
		}
	}
	else {
		let startYear = Math.round(Math.random() * 10) + 2000;
		let yearCount = 4;
		
		for(let i = 0; i < yearCount; i++)
			//for(let m = 0; m < 12; m++)
				SalesTotals.insert({year: startYear + i/*, month: m*/, total: Math.round(Math.random() * 10000) / 100});
	}
}

Template.GraphTest.onCreated(function() {
	let template = Template.instance();
	
	changeData();
});
Template.GraphTest.onRendered(function() {
	////Build the SVG Graphs
	let margin = {top: 20, right: 20, bottom: 30, left: 80};
	let width = 960 - margin.left - margin.right;
	let height = 500 - margin.top - margin.bottom;
	let x0Scale = d3.scaleBand().range([0, width]).padding(0.1);
	let yScale = d3.scaleLinear().range([height, 0]);
	let svg = d3.select('svg.salesGraph')
		.attr("viewBox", "0 0 960 500")
		.attr("perserveAspectRatio", "xMidYMid meet")
		.append("g")
		.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
	let xLabels = svg.append("g").attr("transform", "translate(0, " + height + ")");
	let yLabels = svg.append("g");

	Tracker.autorun(function() {
		let dataset = SalesTotals.find({}).fetch();

		//Update scale domains
		x0Scale.domain([...new Set(dataset.map(item => item.year))]);
		yScale.domain([0, d3.max(dataset, function(d) {return d.total})]);

		//Join the data set with the existing data in the svg element.
		let bars = svg.selectAll('.bar').data(dataset);

		//Handle existing elements.
		// bars.[do something here ie: attr('class', 'oldValues')]
		//Handle the new data elements by adding them to the svg element.
		bars.enter().append('rect')
			.attr('class', 'bar')
			.attr('x', function(d) {
				return x0Scale(d.year);
			})
			.attr('width', x0Scale.bandwidth())
			.attr('y', function(d) {
				return yScale(d.total);
			})
			.attr('height', function(d) {
				return height - yScale(d.total);
			});
		
		bars.transition()
		// .delay(function(d, i) {
		// 	return i / dataset.length * 1000;
		// }) // this delay will make transistions sequential instead of parallel
			.duration(500)
			.attr("x", function(d, i) {
				return x0Scale(d.year);
			})
			.attr("y", function(d) {
				return yScale(d.total);
			})
			.attr("width", x0Scale.bandwidth())
			.attr("height", function(d) {
				return height - yScale(d.total);
			});
			//.attr("fill", function(d) {
			//	return "rgb(0, 0, " + (d.total * 10) + ")";
			//});

		bars.exit()
			.transition()
			.duration(500)
			.attr("x", -x0Scale.bandwidth())
			.remove();

		let barTexts = svg.selectAll('text.barText').data(dataset);

		barTexts.enter().append("text")
			.attr("class", "barText")
			.attr("text-anchor", "middle")
			.attr('x', function(d) {return x0Scale(d.year) + x0Scale.bandwidth() / 2;})
			.attr('y', function(d) {return yScale(d.total) - 2;})
			.text(function(d) {return "$" + Math.round(d.total)});
		
		barTexts.transition()
			.duration(500)
			.attr('x', function(d) {return x0Scale(d.year) + x0Scale.bandwidth() / 2;})
			.attr('y', function(d) {return yScale(d.total) - 2;})
			.text(function(d) {return "$" + Math.round(d.total)});
		
		barTexts.exit()
			.remove();

		//Add the x & y axis labels
		xLabels.attr("class", "xAxisLabels").call(d3.axisBottom(x0Scale));
		yLabels.attr("class", "yAxisLabels").call(d3.axisLeft(yScale));
	});
});
Template.GraphTest.helpers({
	sales: function() {
		let sort = [];
		
		sort.push(['year', 'asc']);
		
		return SalesTotals.find({}, {sort: sort});
	},
	formatTotal: function(total) {
		return "$" + total.toFixed(2);
	}
});
Template.GraphTest.events({
	'click button[name="changeData"]': function(event, template) {
		changeData();
	}
});




/*
//Select…
let bars = svg.selectAll("rect").data(dataset, key);

//Enter…
bars.enter()
	.append("rect")
	.attr("x", w)
	.attr("y", function(d) {
		return h - yScale(d.total);
	})
	//.attr("width", x0Scale.rangeBand())
	.attr("width", x0Scale.bandwidth())
	.attr("height", function(d) {
		return yScale(d.total);
	})
	.attr("fill", function(d) {
		return "rgb(0, 0, " + (d.total * 10) + ")";
	})
	.attr("data-id", function(d){
		return d._id;
	});

//Update…
bars.transition()
	// .delay(function(d, i) {
	// 	return i / dataset.length * 1000;
	// }) // this delay will make transistions sequential instead of paralle
	.duration(500)
	.attr("x", function(d, i) {
		return x0Scale(i);
	})
	.attr("y", function(d) {
		return h - yScale(d.total);
	})
	.attr("width", x0Scale.bandwidth())
	.attr("height", function(d) {
		return yScale(d.total);
	}).attr("fill", function(d) {
		return "rgb(0, 0, " + (d.total * 10) + ")";
	});

//Exit…
bars.exit()
	.transition()
	.duration(500)
	.attr("x", -x0Scale.bandwidth())
	.remove();



//Update all labels

//Select…
let labels = svg.selectAll("text")
	.data(dataset, key);

//Enter…
labels.enter()
	.append("text")
	.text(function(d) {
		return d.total;
	})
	.attr("text-anchor", "middle")
	.attr("x", w)
	.attr("y", function(d) {
		return h - yScale(d.total) + 14;
	})
	.attr("font-family", "sans-serif")
	.attr("font-size", "11px")
	.attr("fill", "white");

//Update…
labels.transition()
	// .delay(function(d, i) {
	// 	return i / dataset.length * 1000;
	// }) // this delay will make transistions sequential instead of paralle
	.duration(500)
	.attr("x", function(d, i) {
		return x0Scale(i) + x0Scale.bandwidth() / 2;
	}).attr("y", function(d) {
		return h - yScale(d.total) + 14;
	}).text(function(d) {
		return d.total;
	});

//Exit…
labels.exit()
	.transition()
	.duration(500)
	.attr("x", -x0Scale.bandwidth())
	.remove();
	*/