/* eslint-disable no-constant-condition, no-prototype-builtins, no-undef */
/**
 * Ribbons Class File.
 * Creates low-poly ribbons background effect inside a target container.
 * https://gist.github.com/imaegoo/074b5842d9cd8d80ecfa0d3fa4ecd556
 */
(function (name, factory) {
    if (typeof window === 'object') {
        window[name] = factory()
    }
})('Ribbons', function () {
    var _w = window,
        _d = document.documentElement

    // random helper
    var random = function () {
        if (arguments.length === 1) {
            // only 1 argument
            if (Array.isArray(arguments[0])) {
                // extract index from array
                var index = Math.round(random(0, arguments[0].length - 1))
                return arguments[0][index]
            }
            return random(0, arguments[0]) // assume numeric
        } else if (arguments.length === 2) {
            // two arguments range
            return Math.random() * (arguments[1] - arguments[0]) + arguments[0]
        } else if (arguments.length === 4) {
            //

            var array = [arguments[0], arguments[1], arguments[2], arguments[3]]
            return array[Math.floor(Math.random() * array.length)]
            //return console.log(item)
        }
        return 0 // default
    }

    // screen helper
    var screenInfo = function () {
        const width = Math.max(0, _w.innerWidth || _d.clientWidth || document.body.clientWidth || 0)
        const height = Math.max(0, _w.innerHeight || _d.clientHeight || document.body.clientHeight || 0)
        const scrollx = Math.max(0, _w.pageXOffset || _d.scrollLeft || document.body.scrollLeft || 0) - (_d.clientLeft || 0)
        const scrolly = Math.max(0, _w.pageYOffset || _d.scrollTop || document.body.scrollTop || 0) - (_d.clientTop || 0)

        return {
            width: width,
            height: height,
            ratio: width / height,
            centerx: width / 2,
            centery: height / 2,
            scrollx: scrollx,
            scrolly: scrolly
        }
    }

    // point object
    var Point = function (x, y) {
        this.x = 0
        this.y = 0
        this.set(x, y)
    }
    Point.prototype = {
        constructor: Point,

        set: function (x, y) {
            this.x = x || 0
            this.y = y || 0
        },
        copy: function (point) {
            this.x = point.x || 0
            this.y = point.y || 0
            return this
        },
        multiply: function (x, y) {
            this.x *= x || 1
            this.y *= y || 1
            return this
        },
        divide: function (x, y) {
            this.x /= x || 1
            this.y /= y || 1
            return this
        },
        add: function (x, y) {
            this.x += x || 0
            this.y += y || 0
            return this
        },
        subtract: function (x, y) {
            this.x -= x || 0
            this.y -= y || 0
            return this
        },
        clampX: function (min, max) {
            this.x = Math.max(min, Math.min(this.x, max))
            return this
        },
        clampY: function (min, max) {
            this.y = Math.max(min, Math.min(this.y, max))
            return this
        },
        flipX: function () {
            this.x *= -1
            return this
        },
        flipY: function () {
            this.y *= -1
            return this
        }
    }

    // class constructor
    var Factory = function (options) {
        this._canvas = null
        this._context = null
        this._sto = null
        this._width = 0
        this._height = 0
        this._scroll = 0
        this._ribbons = []
        this._options = {
            // ribbon color HSL saturation amount
            colorSaturation: '80%',
            // ribbon color HSL brightness amount
            colorBrightness: '60%',
            // ribbon color opacity amount
            colorAlpha: 0.65,
            // how fast to cycle through colors in the HSL color space
            colorCycleSpeed: 6,
            // where to start from on the Y axis on each side (top|min, middle|center, bottom|max, random)
            verticalPosition: 'center',
            // how fast to get to the other side of the screen
            horizontalSpeed: 150,
            // how many ribbons to keep on screen at any given time
            ribbonCount: 3,
            // add stroke along with ribbon fill colors
            strokeSize: 0,
            // move ribbons vertically by a factor on page scroll
            parallaxAmount: -0.5,
            // add animation effect to each ribbon section over time
            animateSections: true,
            // element to attach the effect to
            element: document.body
        }
        this._onDraw = this._onDraw.bind(this)
        this._onResize = this._onResize.bind(this)
        this._onScroll = this._onScroll.bind(this)
        this.setOptions(options)
        this.init()
    }

    // class prototype
    Factory.prototype = {
        constructor: Factory,

        // Set and merge local options
        setOptions: function (options) {
            if (typeof options === 'object') {
                for (var key in options) {
                    if (options.hasOwnProperty(key)) {
                        this._options[key] = options[key]
                    }
                }
            }
        },

        // Initialize the ribbons effect
        init: function () {
            try {
                this._canvas = document.createElement('canvas')
                this._canvas.style['display'] = 'block'
                this._canvas.style['position'] = 'absolute'
                this._canvas.style['margin'] = '0'
                this._canvas.style['padding'] = '0'
                this._canvas.style['border'] = '0'
                this._canvas.style['outline'] = '0'
                this._canvas.style['left'] = '0'
                this._canvas.style['top'] = '0'
                this._canvas.style['width'] = '100%'
                this._canvas.style['height'] = '100%'
                this._canvas.style['z-index'] = '-1'
                this._onResize()

                this._context = this._canvas.getContext('2d')
                this._context.clearRect(0, 0, this._width, this._height)
                this._context.globalAlpha = this._options.colorAlpha

                window.addEventListener('resize', this._onResize)
                window.addEventListener('scroll', this._onScroll)
                this._options.element.appendChild(this._canvas)
            } catch (e) {
                console.warn('Canvas Context Error: ' + e.toString())
                return
            }
            this._onDraw()
        },

        // Create a new random ribbon and to the list
        addRibbon: function () {
            // movement data
            var dir = Math.round(random(1, 9)) > 5 ? 'right' : 'left',
                stop = 1000,
                hide = 200,
                min = 0 - hide,
                max = this._width + hide,
                movex = 0,
                movey = 0,
                startx = dir === 'right' ? min : max,
                starty = Math.round(random(0, this._height))

            // asjust starty based on options
            if (/^(top|min)$/i.test(this._options.verticalPosition)) {
                starty = 0 + hide
            } else if (/^(middle|center)$/i.test(this._options.verticalPosition)) {
                starty = this._height / 2
            } else if (/^(bottom|max)$/i.test(this._options.verticalPosition)) {
                starty = this._height - hide
            }

            // ribbon sections data
            var ribbon = [],
                point1 = new Point(startx, starty),
                point2 = new Point(startx, starty),
                point3 = null,
                color = Math.round(random(35, 35, 40, 40)),
                delay = 0

            // buils ribbon sections
            while (true) {
                if (stop <= 0) break
                stop--

                movex = Math.round(
                    (Math.random() * 1 - 0.2) * this._options.horizontalSpeed
                )
                movey = Math.round((Math.random() * 1 - 0.5) * (this._height * 0.25))

                point3 = new Point()
                point3.copy(point2)

                if (dir === 'right') {
                    point3.add(movex, movey)
                    if (point2.x >= max) break
                } else if (dir === 'left') {
                    point3.subtract(movex, movey)
                    if (point2.x <= min) break
                }
                // point3.clampY( 0, this._height );
                //console.log(Math.round(random(1, 5)))
                ribbon.push({
                    // single ribbon section
                    point1: new Point(point1.x, point1.y),
                    point2: new Point(point2.x, point2.y),
                    point3: point3,
                    color: color,
                    delay: delay,
                    dir: dir,
                    alpha: 0,
                    phase: 0
                })

                point1.copy(point2)
                point2.copy(point3)

                delay += 4
                //color += 1
                //console.log('colorCycleSpeed', color)
            }
            this._ribbons.push(ribbon)
        },

        // Draw single section
        _drawRibbonSection: function (section) {
            if (section) {
                if (section.phase >= 1 && section.alpha <= 0) {
                    return true // done
                }
                if (section.delay <= 0) {
                    section.phase += 0.02
                    section.alpha = Math.sin(section.phase) * 1
                    section.alpha = section.alpha <= 0 ? 0 : section.alpha
                    section.alpha = section.alpha >= 1 ? 1 : section.alpha

                    if (this._options.animateSections) {
                        var mod = Math.sin(1 + section.phase * Math.PI / 2) * 0.1

                        if (section.dir === 'right') {
                            section.point1.add(mod, 0)
                            section.point2.add(mod, 0)
                            section.point3.add(mod, 0)
                        } else {
                            section.point1.subtract(mod, 0)
                            section.point2.subtract(mod, 0)
                            section.point3.subtract(mod, 0)
                        }
                        section.point1.add(0, mod)
                        section.point2.add(0, mod)
                        section.point3.add(0, mod)
                    }
                } else {
                    section.delay -= 0.5
                }
                //console.log('section.color', section.color)
                var s = this._options.colorSaturation,
                    l = this._options.colorBrightness,
                    c =
                        'hsla(' +
                        section.color +
                        ', ' +
                        s +
                        ', ' +
                        l +
                        ', ' +
                        section.alpha +
                        ' )'

                this._context.save()

                if (this._options.parallaxAmount !== 0) {
                    this._context.translate(
                        0,
                        this._scroll * this._options.parallaxAmount
                    )
                }
                this._context.beginPath()
                this._context.moveTo(section.point1.x, section.point1.y)
                this._context.lineTo(section.point2.x, section.point2.y)
                this._context.lineTo(section.point3.x, section.point3.y)
                this._context.fillStyle = c
                this._context.fill()

                if (this._options.strokeSize > 0) {
                    this._context.lineWidth = this._options.strokeSize
                    this._context.strokeStyle = c
                    this._context.lineCap = 'round'
                    this._context.stroke()
                }
                this._context.restore()
            }
            return false // not done yet
        },

        // Draw ribbons
        _onDraw: function () {
            // cleanup on ribbons list to rtemoved finished ribbons
            for (var i = 0, t = this._ribbons.length; i < t; ++i) {
                if (!this._ribbons[i]) {
                    this._ribbons.splice(i, 1)
                }
            }

            // draw new ribbons
            this._context.clearRect(0, 0, this._width, this._height)

            for (
                var a = 0;
                a < this._ribbons.length;
                ++a // single ribbon
            ) {
                var ribbon = this._ribbons[a],
                    numSections = ribbon.length,
                    numDone = 0

                for (
                    var b = 0;
                    b < numSections;
                    ++b // ribbon section
                ) {
                    if (this._drawRibbonSection(ribbon[b])) {
                        numDone++ // section done
                    }
                }
                if (numDone >= numSections) {
                    // ribbon done
                    this._ribbons[a] = null
                }
            }
            // maintain optional number of ribbons on canvas
            if (this._ribbons.length < this._options.ribbonCount) {
                this.addRibbon()
            }
            requestAnimationFrame(this._onDraw)
        },

        // Update container size info
        _onResize: function (e) {
            var screen = screenInfo(e)
            this._width = screen.width
            this._height = screen.height

            if (this._canvas) {
                this._canvas.width = this._width
                this._canvas.height = this._height

                if (this._context) {
                    this._context.globalAlpha = this._options.colorAlpha
                }
            }
        },

        // Update container size info
        _onScroll: function (e) {
            var screen = screenInfo(e)
            this._scroll = screen.scrolly
        }
    }

    // export
    return Factory
})