/* -------------- */
/* GAMEPAD MASTER */
/* -------------- */

'use strict';

class Library {
    constructor() {
        if (typeof Library.instance === 'object') {
            return Library.instance;
        };
        this.init();
        Library.instance = this;
        return this;
    };
    init = () => {
        this.state = 'load';
        this.patterns = this.update();
    };
    update = async () => {
        const url = 'https://wavelovers.ru/assets/patterns.json';
        try {
            const response = await fetch(url);
            if (response.ok) {
                let json = await response.json();
                this.patterns = json;
                this.state = 'draw';
            } else {
                console.log('Connect to the Internet for download more patterns...');
                this.state = 'fail';
            };
        } catch (error) {
            console.log('[error]', error);
        };
    };
};

class Gamepad {
    constructor(gamepad, $container) {
        this.unit = gamepad;
        this.$container = $container;
        this.init();
    };

    init = () => {
        this.id = Date.now();
        this.canVibrate = (this.unit.vibrationActuator) ? true : false;
        this.isVibrating = false;

        this.library = new Library;

        this.index = 0;
        this.pattern = this.library.patterns[this.index].pattern;

        this.generateBox();
    };

    delete = () => {
        this.$list_item.parentNode.removeChild(this.$list_item);
    };
    generateBox = () => {
        const $list_item = document.createElement('div');
        const $info_box = document.createElement('div');

        $list_item.classList.add('list-item');
        $info_box.classList.add('list-item__info');

        $list_item.appendChild($info_box);
        this.$container.appendChild($list_item);

        this.$list_item = $list_item;
        this.$info_box = $info_box;
        this.draw();
    };
    draw = () => {
        this.$info_box.innerHTML = `
            <span>Gamepad #${this.unit.index + 1}. ${this.unit.id}.</span>`;
        if (this.isSelected === true) {
            this.$list_item.classList.add('list-item_selected');
        } else {
            this.$list_item.classList.remove('list-item_selected');
        };
    };

    update = () => {
        let gamepads = navigator.getGamepads();
        this.unit = gamepads[this.unit.index];
    };

    reset = () => {
        this.isVibrating = false;
        this.unit.vibrationActuator.reset();
    };
    vibrate = async () => {
        this.isVibrating = true;
        this.pattern = this.library.patterns[this.index].pattern;

        while (this.isVibrating) {
            for (let i = 0; i < this.pattern.length; i++) {
                if (this.isVibrating) {
                    this.unit.vibrationActuator.playEffect('dual-rumble', this.pattern[i]);
                    await this.sleep(this.pattern[i].startDelay + this.pattern[i].duration + 100);
                } else {
                    return;
                };
            };
        };
    };
    sleep = (ms) => {
        return new Promise(resolve => setTimeout(resolve, ms));
    };
    change = (index) => {
        this.index = index;
        this.pattern = this.library.patterns[this.index].pattern;
    };
};

class Wavelovers {
    constructor() {
        this.init();
    };
    init = () => {
        this.#DOMs();
        this.library = new Library();

        if (!this.checkGamepadSupport()) {
            console.log(`This browser does not support of gamepads.`);
            this.$MESSAGE.innerText = `This browser does not support of gamepads.`;
            return;
        } else {
            console.log(`Press any gamepad's button or connect new gamepad.`);
            this.$MESSAGE.innerText = `Press any gamepad's button or connect new gamepad.`;
        };

        this.gamepads = [];
        this.#eventListeners();
        this.interval = setInterval(this.eventLoop, 1);
    };

    eventLoop = () => {
        this.update();
        this.draw();
    };
    update = () => {
        if (this.gamepads.length > 0) {
            this.$MESSAGE.classList.add('hidden');
            this.$DEVICE_LIST.classList.remove('hidden');
            this.gamepads.forEach(gamepad => {
                gamepad.update();
            });
        } else {
            this.$MESSAGE.classList.remove('hidden');
            this.$DEVICE_LIST.classList.add('hidden');
        };
    };
    draw = () => {
        if (this.gamepads.length > 0) {
            this.gamepads.forEach(gamepad => {
                gamepad.draw();
            });
        };
        if (this.library.state === 'draw') {
            this.print(this.library.patterns);
            this.library.state = 'ready';
        };
        if (this.library.state === 'fail') {
            this.$PATTERN_LIST.innerHTML = `
                <div class="message">
                    <span>Loading error...</span>
                </div>`;
        };
    };

    print = (patterns) => {
        this.$PATTERN_LIST.innerHTML = '';
        patterns.forEach((pattern, index) => {
            const $container = document.createElement('div');
            const $icon = document.createElement('span');
            const $name = document.createElement('span');

            $container.classList.add('pattern-item');
            $icon.classList.add('pattern-item__icon');
            $name.classList.add('pattern-item__name');

            $icon.innerHTML = pattern.icon;
            $name.innerHTML = pattern.name;

            $container.appendChild($icon);
            $container.appendChild($name);

            $container.addEventListener('click', () => this.change(index));

            this.$PATTERN_LIST.appendChild($container);
            pattern['container'] = $container;
        });
    };
    change = (index) => {
        if (this.gamepads.length > 0) {
            this.gamepads.forEach(gamepad => {
                if (gamepad.canVibrate === true) {
                    this.unselect(this.library.patterns);
                    if (gamepad.index === index &&
                        gamepad.isVibrating === true) {
                        gamepad.reset();
                    } else {
                        gamepad.reset()
                        gamepad.change(index);
                        gamepad.vibrate();
                        this.select(this.library.patterns, index);
                    };
                };
            });
        } else {
            console.log('No connected devices...');
            return;
        };
    };

    unselect = (patterns) => {
        patterns.forEach(pattern => {
            pattern['container'].classList.remove('pattern-item__selected');
        });
    };
    select = (patterns, index) => {
        patterns[index]['container'].classList.add('pattern-item__selected');
    };

    checkGamepadSupport = () => {
        return 'getGamepads' in window.navigator;
    };

    #DOMs = () => {
        this.$DEVICE_BOX = document.querySelector('#device-box');
        this.$MESSAGE = document.querySelector('#message');
        this.$DEVICE_LIST = document.querySelector('#device-list');
        this.$PATTERN_BOX = document.querySelector('#pattern-box');
        this.$PATTERN_LIST = document.querySelector('#pattern-list');
    };
    #eventListeners = () => {
        window.addEventListener('gamepadconnected', (event) => {
            if (this.gamepads.length > 1) {
                return;
            } else {
                this.gamepads.push(new Gamepad(event.gamepad, this.$DEVICE_LIST));
            };
        });
        window.addEventListener('gamepaddisconnected', (event) => {
            this.gamepads.forEach((gamepad, index) => {
                if (gamepad.unit.id === event.gamepad.id) {
                    this.gamepads[index].delete();
                    this.gamepads.splice(index, 1);
                };
            });
            this.unselect();
        });
    };
};

/* -------------- */
/* INITIALIZATION */
/* -------------- */

const WAVELOVERS = new Wavelovers();