import { makeSVGGroup } from '../utils/draw';
import { xLine, yLine, yMarker, yRegion, datasetBar, datasetDot, getPaths } from '../utils/draw';
import { equilizeNoOfElements } from '../utils/draw-utils';
import { translateHoriLine, translateVertLine, animateRegion, animateBar, animateDot, animatePath } from '../utils/animate';

class ChartComponent {
	constructor({
		layerClass = '',
		layerTransform = '',
		constants,

		getData,
		makeElements,
		animateElements
	}) {
		this.layerTransform = layerTransform;
		this.constants = constants;

		this.makeElements = makeElements;
		this.getData = getData;

		this.animateElements = animateElements;

		this.store = [];

		this.layerClass = layerClass;
		this.layerClass = typeof(this.layerClass) === 'function'
			? this.layerClass() : this.layerClass;

		this.refresh();
	}

	refresh(data) {
		this.data = data || this.getData();
	}

	setup(parent) {
		this.layer = makeSVGGroup(parent, this.layerClass, this.layerTransform);
	}

	make() {
		this.render(this.data);
		this.oldData = this.data;
	}

	render(data) {
		this.store = this.makeElements(data);

		this.layer.textContent = '';
		this.store.forEach(element => {
			this.layer.appendChild(element);
		});
	}

	update(animate = true) {
		this.refresh();
		let animateElements = []
		if(animate) {
			animateElements = this.animateElements(this.data);
		}
		return animateElements;
	}
}

let componentConfigs = {
	yAxis: {
		layerClass: 'y axis',
		makeElements(data) {
			return data.positions.map((position, i) =>
				yLine(position, data.labels[i], this.constants.width,
					{mode: this.constants.mode, pos: this.constants.pos})
			);
		},

		animateElements(newData) {
			let newPos = newData.positions;
			let newLabels = newData.labels;
			let oldPos = this.oldData.positions;
			let oldLabels = this.oldData.labels;

			[oldPos, newPos] = equilizeNoOfElements(oldPos, newPos);
			[oldLabels, newLabels] = equilizeNoOfElements(oldLabels, newLabels);

			this.render({
				positions: oldPos,
				labels: newLabels
			});

			return this.store.map((line, i) => {
				return translateHoriLine(
					line, newPos[i], oldPos[i]
				);
			});
		}
	},

	xAxis: {
		layerClass: 'x axis',
		makeElements(data) {
			return data.positions.map((position, i) =>
				xLine(position, data.calcLabels[i], this.constants.height,
					{mode: this.constants.mode, pos: this.constants.pos})
			);
		},

		animateElements(newData) {
			let newPos = newData.positions;
			let newLabels = newData.calcLabels;
			let oldPos = this.oldData.positions;
			let oldLabels = this.oldData.calcLabels;

			[oldPos, newPos] = equilizeNoOfElements(oldPos, newPos);
			[oldLabels, newLabels] = equilizeNoOfElements(oldLabels, newLabels);

			this.render({
				positions: oldPos,
				calcLabels: newLabels
			});

			return this.store.map((line, i) => {
				return translateVertLine(
					line, newPos[i], oldPos[i]
				);
			});
		}
	},

	yMarkers: {
		layerClass: 'y-markers',
		makeElements(data) {
			return data.map(marker =>
				yMarker(marker.position, marker.label, this.constants.width,
					{pos:'right', mode: 'span', lineType: 'dashed'})
			);
		},
		animateElements(newData) {
			[this.oldData, newData] = equilizeNoOfElements(this.oldData, newData);

			let newPos = newData.map(d => d.position);
			let newLabels = newData.map(d => d.label);

			let oldPos = this.oldData.map(d => d.position);
			let oldLabels = this.oldData.map(d => d.label);

			this.render(oldPos.map((pos, i) => {
				return {
					position: oldPos[i],
					label: newLabels[i]
				}
			}));

			return this.store.map((line, i) => {
				return translateHoriLine(
					line, newPos[i], oldPos[i]
				);
			});
		}
	},

	yRegions: {
		layerClass: 'y-regions',
		makeElements(data) {
			return data.map(region =>
				yRegion(region.start, region.end, this.constants.width,
					region.label)
			);
		},
		animateElements(newData) {
			[this.oldData, newData] = equilizeNoOfElements(this.oldData, newData);

			let newPos = newData.map(d => d.end);
			let newLabels = newData.map(d => d.label);
			let newStarts = newData.map(d => d.start);

			let oldPos = this.oldData.map(d => d.end);
			let oldLabels = this.oldData.map(d => d.label);
			let oldStarts = this.oldData.map(d => d.start);

			this.render(oldPos.map((pos, i) => {
				return {
					start: oldStarts[i],
					end: oldPos[i],
					label: newLabels[i]
				}
			}));

			let animateElements = [];

			this.store.map((rectGroup, i) => {
				animateElements = animateElements.concat(animateRegion(
					rectGroup, newStarts[i], newPos[i], oldPos[i]
				));
			});

			return animateElements;
		}
	},

	barGraph: {
		layerClass: function() { return 'dataset-units dataset-bars dataset-' + this.constants.index; },
		makeElements(data) {
			let c = this.constants;
			this.unitType = 'bar';
			this.units = data.yPositions.map((y, j) => {
				return datasetBar(
					data.xPositions[j],
					y,
					data.barWidth,
					c.color,
					data.labels[j],
					j,
					data.offsets[j],
					{
						zeroLine: data.zeroLine,
						barsWidth: data.barsWidth,
						minHeight: c.minHeight
					}
				)
			});
			return this.units;
		},
		animateElements(newData) {
			let c = this.constants;

			let newXPos = newData.xPositions;
			let newYPos = newData.yPositions;
			let newOffsets = newData.offsets;
			let newLabels = newData.labels;

			let oldXPos = this.oldData.xPositions;
			let oldYPos = this.oldData.yPositions;
			let oldOffsets = this.oldData.offsets;
			let oldLabels = this.oldData.labels;

			[oldXPos, newXPos] = equilizeNoOfElements(oldXPos, newXPos);
			[oldYPos, newYPos] = equilizeNoOfElements(oldYPos, newYPos);
			[oldOffsets, newOffsets] = equilizeNoOfElements(oldOffsets, newOffsets);
			[oldLabels, newLabels] = equilizeNoOfElements(oldLabels, newLabels);

			this.render({
				xPositions: oldXPos,
				yPositions: oldYPos,
				offsets: oldOffsets,
				labels: newLabels,

				zeroLine: this.oldData.zeroLine,
				barsWidth: this.oldData.barsWidth,
				barWidth: this.oldData.barWidth,
			});

			let animateElements = [];

			this.store.map((bar, i) => {
				animateElements = animateElements.concat(animateBar(
					bar, newXPos[i], newYPos[i], newData.barWidth, newOffsets[i], c.index,
						{zeroLine: newData.zeroLine}
				));
			});

			return animateElements;
		}
	},

	lineGraph: {
		layerClass: function() { return 'dataset-units dataset-line dataset-' + this.constants.index; },
		makeElements(data) {
			let c = this.constants;
			this.unitType = 'dot';
			this.paths = {};
			if(!c.hideLine) {
				this.paths = getPaths(
					data.xPositions,
					data.yPositions,
					c.color,
					{
						heatline: c.heatline,
						regionFill: c.regionFill
					},
					{
						svgDefs: c.svgDefs,
						zeroLine: data.zeroLine
					}
				)
			}

			this.units = []
			if(!c.hideDots) {
				this.units = data.yPositions.map((y, j) => {
					return datasetDot(
						data.xPositions[j],
						y,
						data.radius,
						c.color,
						(c.valuesOverPoints ? data.values[j] : ''),
						j
					)
				});
			}

			return Object.values(this.paths).concat(this.units);
		},
		animateElements(newData) {
			let c = this.constants;

			let newXPos = newData.xPositions;
			let newYPos = newData.yPositions;
			let newValues = newData.values;


			let oldXPos = this.oldData.xPositions;
			let oldYPos = this.oldData.yPositions;
			let oldValues = this.oldData.values;

			[oldXPos, newXPos] = equilizeNoOfElements(oldXPos, newXPos);
			[oldYPos, newYPos] = equilizeNoOfElements(oldYPos, newYPos);
			[oldValues, newValues] = equilizeNoOfElements(oldValues, newValues);

			this.render({
				xPositions: oldXPos,
				yPositions: oldYPos,
				values: newValues,

				zeroLine: this.oldData.zeroLine,
				radius: this.oldData.radius,
			});

			let animateElements = [];

			if(Object.keys(this.paths).length) {
				animateElements = animateElements.concat(animatePath(
					this.paths, newXPos, newYPos, newData.zeroLine));
			}

			if(this.units.length) {
				this.units.map((dot, i) => {
					animateElements = animateElements.concat(animateDot(
						dot, newXPos[i], newYPos[i]));
				});
			}

			return animateElements;
		}
	}
}

export function getComponent(name, constants, getData) {
	let keys = Object.keys(componentConfigs).filter(k => name.includes(k));
	let config = componentConfigs[keys[0]];
	Object.assign(config, {
		constants: constants,
		getData: getData
	})
	return new ChartComponent(config);
}