angular.module("lottery",[])
.controller('ctrl_lottery',['$scope','$timeout',function($scope,$timeout){

    //1.初始化獎品資料
    $scope.items = [
        {id:1,name:"歐洲豪華遊",status:0},
        {id:2,name:"Mac臺式電腦",status:0},
        {id:3,name:"IPhone6手機",status:0},
        {id:4,name:"時尚山地車",status:0},
        {id:5,name:"高清數字電視",status:0},
        {id:6,name:"100元話費",status:0}
    ];

    $scope.result = "獎品為空";
    $scope.$$ = function(id){
        return document.getElementById(id);
    }

    $scope.showhide = function(pre,next){
        pre = "step"+pre;
        next = "step"+next;
        $scope.$$(pre).style.display = "none";
        $scope.$$(next).style.display = "block";
    }

    //開始抽獎
    $scope.start = function(){
        $scope.showhide(1,2);  //step1隱藏 step2顯示
        var circle = 5;
        var selkey = Math.floor(Math.random()*$scope.items.length);
        var next = function(key){
            $scope.items[key].status = true; //該獎品顯示active狀態 ng-class="{'active':item.status}"
            if((key-1)>=0){
                $scope.items[key-1].status = false;  //前一個獎品removeClass active
            }
            if(key==0){
                $scope.items[$scope.items.length-1].status = false;
            }
            var timer = $timeout(function() {
                if(circle <= 0 && selkey == key){  //完成指定圈數&&隨機中獎數值與某個獎品的索引號一致  
                    $scope.showhide(2,3); //切換到顯示獎品頁面
                    $scope.result = $scope.items[key].name;
                    return;
                }
                if($scope.items.length == key+1){
                    circle--;   //一圈結束
                }
                if($scope.items[key+1]){
                    next(key+1);       //迴圈呼叫next() 下一個獎品active
                }else{
                    next(0);      //一圈結束，從頭開始
                }
            }, 100);
        }
        next(0); //首次執行next()
    }
    //顯示獎品時
    $scope.reset = function(){
        $scope.showhide(3,1); //隱藏 step3 顯示step1
    }
    $scope.edit = function(){
        $scope.showhide(3,4);
    }

    //修改獎品時
    $scope.add =function(){
        var last_id = lastid();
        $scope.items.push({id:last_id,name:$scope.name,status:0});
    }
    $scope.del =function(id){
        angular.forEach($scope.items,function(value,key){
            if(id == value.id){
                $scope.items.splice(key,1);
            };
        })
    }

    $scope.return = function(){
        $scope.showhide(4,3);
    }

    //內部函式，獲取最後一項資料的id號
    function lastid(){
        var id = 0;
        angular.forEach($scope.items,function(value,key){
            if(id<value.id){
                id = value.id;
            }
        })
        return ++id; //最後一個元素id加1
    }
}])