'use strict'

const t = require('tape')
const regl = require('regl')({ extensions: 'oes_element_index_uint' })
const createSettings = require('../settings-panel')
const createMatrix = require('./')
const panzoom = require('pan-zoom')
const random = require('gauss-random')
const alpha = require('color-alpha')
const palettes = require('nice-color-palettes')
const palette = palettes[Math.floor(Math.random() * palettes.length)]
const fps = require('fps-indicator')({position: 'bottom-right', color: 'black'})
const arrayRange = require('array-range')


// TODO
t('float32 array data input')
t('int32 array data input')


// create splom instance
let splom = createMatrix(regl)


// data for the splom
let passes = []

// create settings panel & bind
let settings = createSettings({
	traces: { value: 1, min: 1, max: 10, type: 'range' },
	variables: { value: 4, min: 1, max: 100, type: 'range' },
	points: { value: 1e3, min: 1, max: 1e4, type: 'range' },
	// snap: { value: false }
}, {
	position: 'center bottom',
	background: 'transparent',
	orientation: 'horizontal'
})

settings.on('change', update)


// regenerate the data based on options
function update () {
	console.time('generate')
	let {traces, variables, points} = settings.values
	traces = parseInt(traces)
	variables = parseInt(variables)
	points = parseInt(points)

	if (traces < passes.length) {
		for (let i = traces; i < passes.length; i++) {
			passes[i] = null
		}
	}

	for (let i = 0; i < traces; i++) {
		let pass = (passes[i] || (passes[i] = {
			color: alpha(palette[i % palette.length], Math.random() * .5 + .25),
			size: 3,
			range: [],
			domain: [],
			// viewport: [100,100, 200,200],
			padding: 2,
			diagonal: true,
			hide: 'bottom',
			marker: (function () {
				let w = 200, h = 200
				let dist = new Array(w*h)
				for (let i = 0; i < w; i++) {
					for (let j = 0; j < h; j++) {
						if (i > j) {
							if (i < h - j) {
								dist[j*w + i] = j/(h/2)
							}
							else {
								dist[j*w + i] = 1 - (i-w/2)/(w/2)
							}
						}
						else {
							if (i < h - j) {
								dist[j*w + i] = i/(w/2)
							}
							else {
								dist[j*w + i] = 1 - (j-h/2)/(h/2)
							}
						}
					}
				}

				return dist
			})()
		}))

		if (!pass.data) pass.data = []
		if (pass.data.length > variables) pass.data.length = variables

		for (let col = 0; col < variables; col++) {
			if (!pass.data[col]) {
				pass.data[col] = []
				pass.data[col].mean = Math.random()
				pass.data[col].sdev = Math.random()
				pass.range[col] = passes[i-1] && passes[i-1].range[col] || [-3,-3,3,3]
			}
			pass.domain[col] = [col/variables,col/variables,(col+1)/variables,(col+1)/variables]
			let colData = pass.data[col]
			let { mean, sdev } = colData
			if (colData.length > points) colData.length = points
			for (let i = colData.length; i < points; i++) {
				colData[i] = random() * sdev + mean
			}
		}
	}
	console.timeEnd('generate')

	console.time('update')
	splom.update(...passes)
	console.timeEnd('update')

	console.time('draw')
	// splom.draw([1,2,3,4,5])
	splom.draw()
	console.timeEnd('draw')
}

update()


panzoom(splom.canvas, e => {
	let cnv = e.target

	let w = cnv.offsetWidth
	let h = cnv.offsetHeight

	let n = settings.values.variables

	let rx = e.x0 / w
	let ry = e.y0 / h

	let i = Math.floor(rx * n)
	let j = Math.floor((1 - ry) * n)

	rx = .5, ry = .5

	let rangePasses = passes.map(pass => {
		let ranges = pass.range

		let xrange = ranges[i][2] - ranges[i][0],
			yrange = ranges[j][3] - ranges[j][1]

		if (e.dz) {
			let dz = e.dz / w
			ranges[i][0] -= rx * xrange * dz
			ranges[i][2] += (1 - rx) * xrange * dz

			ranges[j][1] -= (1 - ry) * yrange * dz
			ranges[j][3] += ry * yrange * dz
		}

		ranges[i][0] -= xrange * n * .5 * e.dx / w
		ranges[i][2] -= xrange * n * .5 * e.dx / w
		ranges[j][1] += yrange * n * .5 * e.dy / h
		ranges[j][3] += yrange * n * .5 * e.dy / h

		return { ranges }
	})

	console.time('update')
	splom.update(...rangePasses)
	console.timeEnd('update')

	console.time('draw')
	splom.draw()
	console.timeEnd('draw')
})