class Gamepad{
    constructor(keyboard){
        var kbd=keyboard.getBindings()
        this.gameBtn = {}
        this.gameBtn[kbd["don_l"]] = ["u", "d", "l", "r"]
        this.gameBtn[kbd["don_r"]] = ["a", "b", "x", "y"]
        this.gameBtn[kbd["ka_l"]] = ["lb", "lt"]
        this.gameBtn[kbd["ka_r"]] = ["rb", "rt"]
        this.menuBtn = {}
        this.menuBtn[kbd["pause"]] = ["start"]
        this.b = {
            "a": "0",
            "b": "1",
            "x": "2",
            "y": "3",
            "lb": "4",
            "rb": "5",
            "lt": "6",
            "rt": "7",
            "back": "8",
            "start": "9",
            "ls": "10",
            "rs": "11",
            "u": "12",
            "d": "13",
            "l": "14",
            "r": "15",
            "guide": "16"
        }
        this.btn = {}
        this.keyboard = keyboard
    }
    play(menuPlay){
        if("getGamepads" in navigator){
            var gamepads = navigator.getGamepads()
        }else{
            return
        }
        var bindings = menuPlay ? this.menuBtn : this.gameBtn
        for(var i = 0; i < gamepads.length; i++){
            if(gamepads[i]){
                var buttons = gamepads[i].buttons
                this.toRelease = {}
                for(var i in bindings){
                    this.toRelease[i] = bindings[i].length
                }
                for(var btnName in buttons){
                    buttonSearch: {
                        for(var bind in bindings){
                            for(var name in bindings[bind]){
                                if(btnName == this.b[bindings[bind][name]]){
                                    this.checkButton(buttons, btnName, bind)
                                    break buttonSearch
                                }
                            }
                        }
                    }
                }
            }
        }
    }
    checkButton(buttons, btnName, keyCode){
        var button = buttons[btnName]
        var pressed = !this.btn[btnName] && button.pressed
        var released = this.btn[btnName] && !button.pressed
        if(pressed){
            this.btn[btnName] = true
        }else if(released){
            delete this.btn[btnName]
        }
        if(pressed){
            if(this.keyboard.getKeys()[keyCode]){
                this.keyboard.setKey(keyCode, false)
            }
            this.keyboard.setKey(keyCode, true)
        }else if(!button.pressed && this.keyboard.getKeys()[keyCode]){
            if(released){
                this.toRelease[keyCode+"released"] = true
            }
            this.toRelease[keyCode]--
            if(this.toRelease[keyCode] == 0 && this.toRelease[keyCode+"released"]){
                this.keyboard.setKey(keyCode, false)
            }
        }
    }
}