/// <reference path="../../node_modules/pxt-core/built/pxtsim.d.ts"/>
/// <reference path="../../libs/microbit/dal.d.ts"/>
/// <reference path="../../libs/microbit/shims.d.ts"/>
/// <reference path="../../libs/microbit/enums.d.ts"/>
/// <reference path="../state/neopixel.ts"/>
/// <reference path="../simlib.ts"/>

//TODO move to utils
namespace pxsim.visuals {
    //expects rgb from 0,255, gives h in [0,360], s in [0, 100], l in [0, 100]
    export function rgbToHsl(rgb: [number, number, number]): [number, number, number] {
        let [r, g, b] = rgb;
        let [r$, g$, b$] = [r / 255, g / 255, b / 255];
        let cMin = Math.min(r$, g$, b$);
        let cMax = Math.max(r$, g$, b$);
        let cDelta = cMax - cMin;
        let h: number, s: number, l: number;
        let maxAndMin = cMax + cMin;

        //lum
        l = (maxAndMin / 2) * 100

        if (cDelta === 0)
            s = h = 0;
        else {
            //hue
            if (cMax === r$)
                h = 60 * (((g$ - b$) / cDelta) % 6);
            else if (cMax === g$)
                h = 60 * (((b$ - r$) / cDelta) + 2);
            else if (cMax === b$)
                h = 60 * (((r$ - g$) / cDelta) + 4);

            //sat
            if (l > 50)
                s = 100 * (cDelta / (2 - maxAndMin));
            else
                s = 100 * (cDelta / maxAndMin);
        }

        return [Math.floor(h), Math.floor(s), Math.floor(l)];
    }
}

namespace pxsim.visuals {
    const PIXEL_SPACING = PIN_DIST * 3;
    const PIXEL_RADIUS = PIN_DIST;
    const CANVAS_WIDTH = 1.2 * PIN_DIST;
    const CANVAS_HEIGHT = 12 * PIN_DIST;
    const CANVAS_VIEW_WIDTH = CANVAS_WIDTH;
    const CANVAS_VIEW_HEIGHT = CANVAS_HEIGHT;
    const CANVAS_VIEW_PADDING = PIN_DIST * 4;
    const CANVAS_LEFT = 1.4 * PIN_DIST;
    const CANVAS_TOP = PIN_DIST;

    // For the instructions parts list
    export function mkNeoPixelPart(xy: Coord = [0, 0]): SVGElAndSize {
        const NP_PART_XOFF = -13.5;
        const NP_PART_YOFF = -11;
        const NP_PART_WIDTH = 87.5;
        const NP_PART_HEIGHT = 190;
        const NEOPIXEL_PART_IMG = "neopixel.svg";
        let [x, y] = xy;
        let l = x + NP_PART_XOFF;
        let t = y + NP_PART_YOFF;
        let w = NP_PART_WIDTH;
        let h = NP_PART_HEIGHT;
        let img = <SVGImageElement>svg.elt("image");
        svg.hydrate(img, {class: "sim-neopixel-strip", x: l, y: t, width: w, height: h,
            href: `/parts/${NEOPIXEL_PART_IMG}`});
        return {el: img, x: l, y: t, w: w, h: h};
    }
    export class NeoPixel implements SVGAndSize<SVGCircleElement> {
        public el: SVGCircleElement;
        public w: number;
        public h: number;
        public x: number;
        public y: number;
        public cx: number;
        public cy: number;

        constructor(xy: Coord = [0, 0]) {
            let circle = <SVGCircleElement>svg.elt("circle");
            let r = PIXEL_RADIUS;
            let [cx, cy] = xy;
            svg.hydrate(circle, {cx: cx, cy: cy, r: r, class: "sim-neopixel"});
            this.el = circle;
            this.w = r * 2;
            this.h = r * 2;
            this.x = cx - r;
            this.y = cy - r;
            this.cx = cx;
            this.cy = cy;
        }

        public setRgb(rgb: [number, number, number]) {
            let hsl = rgbToHsl(rgb);
            let [h, s, l] = hsl;
            //We ignore luminosity since it doesn't map well to real-life brightness
            let fill = `hsl(${h}, ${s}%, 70%)`;
            this.el.setAttribute("fill", fill);
        }
    }

    export class NeoPixelCanvas {
        public canvas: SVGSVGElement;
        public pin: number;
        public pixels: NeoPixel[];
        private viewBox: [number, number, number, number];
        private background: SVGRectElement;

        constructor(pin: number) {
            this.pixels = [];
            this.pin = pin;
            let el = <SVGSVGElement>svg.elt("svg");
            svg.hydrate(el, {
                "class": `sim-neopixel-canvas`,
                "x": "0px",
                "y": "0px",
                "width": `${CANVAS_WIDTH}px`,
                "height": `${CANVAS_HEIGHT}px`,
            });
            this.canvas = el;
            this.background = <SVGRectElement>svg.child(el, "rect", { class: "sim-neopixel-background hidden"});
            this.updateViewBox(-CANVAS_VIEW_WIDTH / 2, 0, CANVAS_VIEW_WIDTH, CANVAS_VIEW_HEIGHT);
        }

        private updateViewBox(x: number, y: number, w: number, h: number) {
            this.viewBox = [x, y, w, h];
            svg.hydrate(this.canvas, {"viewBox": `${x} ${y} ${w} ${h}`});
            svg.hydrate(this.background, {"x": x, "y": y, "width": w, "height": h});
        }

        public update(colors: RGBW[]) {
            if (!colors || colors.length <= 0)
                return;

            for (let i = 0; i < colors.length; i++) {
                let pixel = this.pixels[i];
                if (!pixel) {
                    let cxy: Coord = [0, CANVAS_VIEW_PADDING + i * PIXEL_SPACING];
                    pixel = this.pixels[i] = new NeoPixel(cxy);
                    this.canvas.appendChild(pixel.el);
                }
                let color = colors[i];
                pixel.setRgb(color);
                svg.hydrate(pixel.el, {title: `offset: ${i}`});
            }

            //show the canvas if it's hidden
            svg.removeClass(this.background, "hidden");

            //resize if necessary
            let [first, last] = [this.pixels[0], this.pixels[this.pixels.length - 1]]
            let yDiff = last.cy - first.cy;
            let newH = yDiff + CANVAS_VIEW_PADDING * 2;
            let [oldX, oldY, oldW, oldH] = this.viewBox;
            if (oldH < newH) {
                let scalar = newH / oldH;
                let newW = oldW * scalar;
                this.updateViewBox(-newW / 2, oldY, newW, newH);
            }
        }

        public setLoc(xy: Coord) {
            let [x, y] = xy;
            svg.hydrate(this.canvas, {x: x, y: y});
        }
    };

    function gpioPinToPinNumber(gpioPin: string): number {
        let pinNumStr = gpioPin.split("P")[1];
        let pinNum = Number(pinNumStr) + 7 /*MICROBIT_ID_IO_P0; TODO: don't hardcode this, import enums.d.ts*/;
        return pinNum
    }
    function parseNeoPixelMode(modeStr: string): NeoPixelMode {
        const modeMap: Map<NeoPixelMode> = {
            "NeoPixelMode.RGB": NeoPixelMode.RGB,
            "NeoPixelMode.RGBW": NeoPixelMode.RGBW,
            "*": NeoPixelMode.RGB,
        };
        let mode: NeoPixelMode = null;
        for (let key in modeMap) {
            if (key == modeStr) {
                mode = modeMap[key];
                break;
            }
        }
        U.assert(mode != null, "Unknown NeoPixelMode: " + modeStr);
        return mode;
    }

    export class NeoPixelView implements IBoardComponent<NeoPixelState> {
        public style: string = `
            .sim-neopixel-canvas {
            }
            .sim-neopixel-canvas-parent:hover {
                transform-origin: center;
                transform: scale(4) translateY(-60px);
            }
            .sim-neopixel-canvas .hidden {
                visibility:hidden;
            }
            .sim-neopixel-background {
                fill: rgba(255,255,255,0.9);
            }
            .sim-neopixel-strip {
            }
        `;
        public element: SVGElement;
        public defs: SVGElement[];
        private state: NeoPixelState;
        private canvas: NeoPixelCanvas;
        private part: SVGElAndSize;
        private stripGroup: SVGGElement;
        private lastLocation: Coord;
        private pin: number;
        private mode: NeoPixelMode;

        public init(bus: EventBus, state: NeoPixelState, svgEl: SVGSVGElement, gpioPins: string[], otherArgs: string[]): void {
            U.assert(otherArgs.length === 1, "NeoPixels assumes a RGB vs RGBW mode is passed to it");
            let modeStr = otherArgs[0];
            this.mode = parseNeoPixelMode(modeStr);
            this.state = state;
            this.stripGroup = <SVGGElement>svg.elt("g");
            this.element = this.stripGroup;
            let pinStr = gpioPins[0];
            this.pin = gpioPinToPinNumber(pinStr);
            this.lastLocation = [0, 0];
            let part = mkNeoPixelPart();
            this.part = part;
            this.stripGroup.appendChild(part.el);
            let canvas = new NeoPixelCanvas(this.pin);
            this.canvas = canvas;
            let canvasG = svg.child(this.stripGroup, "g", {class: "sim-neopixel-canvas-parent"});
            canvasG.appendChild(canvas.canvas);
            this.updateStripLoc();
        }
        public moveToCoord(xy: Coord): void {
            let [x, y] = xy;
            let loc: Coord = [x, y];
            this.lastLocation = loc;
            this.updateStripLoc();
        }
        private updateStripLoc() {
            let [x, y] = this.lastLocation;
            this.canvas.setLoc([x + CANVAS_LEFT, y + CANVAS_TOP]);
            svg.hydrate(this.part.el, {transform: `translate(${x} ${y})`}); //TODO: update part's l,h, etc.
        }
        public updateState(): void {
            let colors = this.state.getColors(this.pin, this.mode);
            this.canvas.update(colors);
        }
        public updateTheme (): void { }
    }
}