const Frame = function (duration) {
    this.layers = [];
    this.duration = duration;
}

const LED_COLOR = {
    WHITE: 0,
    RED: 1,
    GREEN: 2,
    BLUE: 3,
}

const ANIMATION_FRAME_QUEUE = [];

const COLOR_CLASS = [];
COLOR_CLASS[LED_COLOR.WHITE] = 'led-white';
COLOR_CLASS[LED_COLOR.RED] = 'led-red';
COLOR_CLASS[LED_COLOR.GREEN] = 'led-green';
COLOR_CLASS[LED_COLOR.BLUE] = 'led-blue';

const Selector = function (id) {
    this.items = [];
    this.currentItem = 0;
    this.html = document.getElementById(id);
    this.htmlDisplay = this.html.querySelector('.selector-display');
    this.htmlItems = this.html.querySelector('.selector-items');

    this.htmlItems.hidden = true;

    this.htmlDisplay.addEventListener(
        'click',
        () => {
            this.htmlItems.hidden = !this.htmlItems.hidden;
        }
    );

    for (const i in this.htmlItems.children) {
        this.htmlItems.children.item(i).addEventListener(
            'click',
            () => {
                this.selectItem(i);
            }
        );
    }

    this.onSelect = function () {};

    this.selectItem = function (index) {
        this.htmlItems.hidden = true;

        if (index !== this.currentItem) {
            this.currentItem = index;

            this.htmlDisplay.innerHTML = this.htmlItems.children.item(index).innerHTML;

            this.onSelect(index);
        }
    };
}

const FrameFactory = function (width, depth, height) {
    this.width = width;
    this.depth = depth;
    this.height = height;

    this.getFrame = function (duration) {
        const frame = new Frame(duration);
        
        for (let z = 0; z < this.height; z++) {
            const layer = [];
            
            for (let led = 0; led < this.width * this.depth; led++) {
                layer.push(false);
            }

            frame.layers.push(layer);
        }

        return frame;
    }
}

const Cube = function (width, depth, height) {
    this.width = width;
    this.depth = depth;
    this.height = height;
    this.html = document.getElementById('cube');
    this.frames = [];
    this.currentFrame = 0;

    this.setup = function () {
        this._setupHtml();
    }

    this.setCurrentFrame = function (frameIndex) {
        this.currentFrame = frameIndex;

        this._loadFrame(frameIndex);
    }

    this.addFrame = function (frame) {
        this.frames.push(frame);
    }

    this.deleteFrame = function (frameIndex) {
        this.frames = this.frames.slice(0, frameIndex).concat(
            this.frames.slice(frameIndex + 1)
        );
    }

    this.switchLed = function (layerIndex, ledIndex) {
        this.frames[this.currentFrame].layers[layerIndex][ledIndex] = !this.frames[this.currentFrame].layers[layerIndex][ledIndex];
    }

    this.setLayer = function (layerIndex, state) {
        for (let index = 0; index < this.width * this.depth; index++) {
            this.frames[this.currentFrame].layers[layerIndex][index] = state;
        }

        for (const row of this.html.children.item(this.height - layerIndex - 1).children) {
            for (const led of row.children) {
                this._setLed(led, state);
            }
        }
    }

    this.setLedColor = function (color) {
        for (const layer of this.html.children) {
            for (const row of layer.children) {
                for (const led of row.children) {
                    for (const cssClass of COLOR_CLASS) {
                        led.classList.remove(cssClass);
                    }

                    led.classList.add(COLOR_CLASS[color]);
                }
            }
        }
    }

    this._loadFrame = function (frameIndex) {
        for (let layer = 0; layer < this.frames[frameIndex].layers.length; layer++) {
            for (let row = 0; row < this.depth; row++) {
                for (let led = 0; led < this.width; led++) {
                    const state = this.frames[frameIndex].layers[layer][row * this.depth + led];

                    this._setLed(this.html.children.item(this.height - layer - 1).children.item(row).children.item(led), state);
                }
            }
        }
    }

    this._setupHtml = function () {
        for (let z = 0; z < this.height; z++) {
            const layerElement = document.createElement('div');
            layerElement.classList.add('layer');
    
            for (let y = 0; y < this.depth; y++) {
                const row = document.createElement('div');
                row.classList.add('row');
    
                for (let x = 0; x < this.width; x++) {
                    const led = document.createElement('div');
                    led.classList.add('led', 'led-off');
    
                    led.addEventListener(
                        'mousedown',
                        (event) => {
                            const index = y * this.depth + x;
                            const layer = this.height - z - 1;

                            this.switchLed(layer, index);
                            this._setLed(event.target, this.frames[this.currentFrame].layers[layer][index]);
                        }
                    );

                    led.addEventListener(
                        'mouseover',
                        (event) => {
                            if (event.buttons === 1) {
                                const index = y * this.depth + x;
                                const layer = this.height - z - 1;
    
                                this.switchLed(layer, index);
                                this._setLed(event.target, this.frames[this.currentFrame].layers[layer][index]);
                            }
                        }
                    );

                    row.appendChild(led);
                }
    
                layerElement.appendChild(row);
            }
    
            this.html.appendChild(layerElement);
        }
    }

    this._setLed = function (ledHtml, state) {
        if (state) {
            ledHtml.classList.remove('led-off');
        } else {
            ledHtml.classList.add('led-off');
        }
    }
}

const FrameMenu = function (id) {
    this.html = document.getElementById(id);
    this.htmlSlider = this.html.querySelector('#frame-slider');
    this.htmlDisplayCurrentFrame = this.html.querySelector('#current-frame');
    this.htmlDisplayFrames = this.html.querySelector('#frame-number');
    this.htmlButtonAddFrameBefore = this.html.querySelector('#button-add-frame-before');
    this.htmlButtonAddFrameAfter = this.html.querySelector('#button-add-frame-after');
    this.htmlButtonToggleAnimation = this.html.querySelector('#button-toggle-animation');
    this.htmlButtonDeleteFrame = this.html.querySelector('#button-delete-frame');
    this.htmlInputDuration = this.html.querySelector('#frame-duration');

    this.isAnimationPlaying = false;

    this.htmlSlider.addEventListener(
        'input', 
        () => {
            this._updateFramePosition();
        }
    );

    this.htmlButtonAddFrameBefore.addEventListener(
        'click',
        () => {
            this._increaseSliderMax();
            this.onFramePrepend();
        }
    );

    this.htmlButtonAddFrameAfter.addEventListener(
        'click',
        () => {
            this._increaseSliderMax();
            this.onFrameAppend();
        }
    );

    this.htmlInputDuration.addEventListener(
        'input',
        () => {
            this.onInputDuration(this.htmlInputDuration.value);
        }
    );

    this.htmlButtonToggleAnimation.addEventListener(
        'click',
        () => {
            this.isAnimationPlaying = !this.isAnimationPlaying;

            this._updateToggleButton();
            this.onToggleAnimation(this.isAnimationPlaying);
        }
    );

    this.htmlButtonDeleteFrame.addEventListener(
        'click',
        () => {
            this._decreaseSliderMax();
            this.onFrameDelete();
        }
    );

    this.slideToFrame = function (frameIndex) {
        this.htmlSlider.value = frameIndex + 1;
        this._updateFramePosition();
    }

    this.setDuration = function (duration) {
        this.htmlInputDuration.value = duration;
    }

    this.startAnimation = function () {
        this.isAnimationPlaying = false;

        this._updateToggleButton();
    }
    
    this.stopAnimation = function () {
        this.isAnimationPlaying = false;

        this._updateToggleButton();
    }

    this.onFramePrepend = function () {}

    this.onFrameAppend = function () {}

    this.onFrameDelete = function () {}

    this.onSlide = function () {}

    this.onInputDuration = function () {}

    this.onToggleAnimation = function () {}

    this._increaseSliderMax = function () {
        const frameNumber = parseInt(this.htmlSlider.max) + 1;

        this.htmlSlider.max = frameNumber;
        this.htmlDisplayFrames.innerText = frameNumber;

        if (frameNumber > 1) {
            this.htmlButtonToggleAnimation.disabled = false;
        }

        this.htmlButtonDeleteFrame.disabled = false;
    }

    this._decreaseSliderMax = function () {
        const frameNumber = parseInt(this.htmlSlider.max) - 1;

        this.htmlSlider.max = frameNumber;
        this.htmlDisplayFrames.innerText = frameNumber;

        if (frameNumber < 2) {
            this.htmlButtonToggleAnimation.disabled = true;
            this.htmlButtonDeleteFrame.disabled = true;
        }
    }

    this._updateFramePosition = function () {
        this.htmlDisplayCurrentFrame.innerText = this.htmlSlider.value;
        this.onSlide(this.htmlSlider.value - 1);
    }

    this._updateToggleButton = function () {
        if (this.isAnimationPlaying) {
            this.htmlButtonToggleAnimation.classList.add('icon-button-stop');
            this.htmlButtonToggleAnimation.classList.remove('icon-button-play');
        } else {
            this.htmlButtonToggleAnimation.classList.add('icon-button-play');
            this.htmlButtonToggleAnimation.classList.remove('icon-button-stop');
        }

        const elements = [
            this.htmlSlider,
            this.htmlButtonAddFrameAfter,
            this.htmlButtonAddFrameBefore,
            this.htmlInputDuration,
            this.htmlButtonDeleteFrame,
        ];

        for (const element of elements) {
            element.disabled = this.isAnimationPlaying;
        }
    }
}

const WIDTH = 4;
const DEPTH = 4;
const HEIGHT = 4;

const cube = new Cube(WIDTH, DEPTH, HEIGHT);
cube.setup();

const frameFactory = new FrameFactory(WIDTH, DEPTH, HEIGHT);

cube.frames.push(frameFactory.getFrame(500));
cube.setCurrentFrame(0);
cube.setLedColor(LED_COLOR.RED);

const colorSelector = new Selector('color-selector');
colorSelector.onSelect = (index) => {
    cube.setLedColor(index);
};
colorSelector.selectItem(LED_COLOR.RED);

const frameMenu = new FrameMenu('frame-menu');
frameMenu.onSlide = (frameIndex) => {
    cube.setCurrentFrame(frameIndex);
    frameMenu.setDuration(cube.frames[cube.currentFrame].duration);
}
frameMenu.onFramePrepend = () => {
    cube.frames = cube.frames.slice(0, cube.currentFrame).concat(
        [frameFactory.getFrame(cube.frames[cube.currentFrame].duration)].concat(
            cube.frames.slice(cube.currentFrame)
        )
    );
    
    frameMenu.slideToFrame(cube.currentFrame - 1);
}
frameMenu.onFrameAppend = () => {
    cube.frames = cube.frames.slice(0, cube.currentFrame + 1).concat(
        [frameFactory.getFrame(cube.frames[cube.currentFrame].duration)].concat(
            cube.frames.slice(cube.currentFrame + 1)
        )
    );
    
    frameMenu.slideToFrame(cube.currentFrame + 1);
}
frameMenu.onInputDuration = (duration) => {
    if (+duration <= 0) {
        return;
    }

    cube.frames[cube.currentFrame].duration = +duration;
}
frameMenu.onToggleAnimation = (isPlaying) => {
    if (isPlaying) {
        let duration = 0;

        for (let frame = cube.currentFrame; frame < cube.frames.length; frame++) {
            duration += cube.frames[frame].duration;

            if (frame === cube.frames.length - 1) {
                setTimeout(
                    () => {
                        frameMenu.stopAnimation();
                    },
                    duration
                );
            }

            ANIMATION_FRAME_QUEUE.push(
                setTimeout(
                    () => {
                        frameMenu.slideToFrame(frame + 1);
                    },
                    duration
                )
            )
        }
    } else {
        for (const frame of ANIMATION_FRAME_QUEUE) {
            clearTimeout(frame);
        }

        frameMenu.stopAnimation();
    }
}
frameMenu.onFrameDelete = () => {
    if (cube.frames.length < 2) {
        return;
    }

    cube.deleteFrame(cube.currentFrame);
    cube.currentFrame--;
    cube.currentFrame = cube.currentFrame < 0 ? 0 : cube.currentFrame;

    frameMenu.slideToFrame(cube.currentFrame);
}