stage {
    backdrop White("gallery:General/White")
    let matrix = [  ];
    let grid = 4;
    let pairs = 0;
    let flip = [];
    let closed = true;

    actor Robot {
        costume Idle("gallery:Figures/Robot Idle")
        function createMatrix(rows, cols) {
            matrix = [  ];
            for(let i = 0; i < rows; i++) {
                let list = [  ];
                for(let j = 0; j < cols; j++) {
                    list.push(0);
                }
                matrix.push(list);
            }
        }
        function showMatrix(rows, cols) {
            let y = 120;
            for(let i = 0; i < rows; i++) {
                let x = -100;
                for(let j = 0; j < cols; j++) {
                    let item = matrix[i][j];
                    item.setPosition(x, y);
                    item.show();
                    x += 120;
                }
                y -= 80;
            }
        }
        function createClones(n) {
            for(let i = 1; i <= n; i++) {
                stage.createClone(Tiles);
            }
        }
        when stage.started {
            this.setPosition(-250,-100);
            this.createMatrix(grid, grid);
            this.createClones(grid * grid);
            this.show();
            this.say("Welcome to the MEMORY game! Find the pairs using the fewest attempts possible.");
            this.wait(2);
            this.say("");
            this.hide();
            this.mix();
            this.showMatrix(grid, grid);
        }
        function mix() {
            for(let k = 1; k <= 8; k++) {
                for(let l = 1; l <= 2; l++) {
                    let item = Tiles;
                    do {
                        let i = Math.randomBetween(0, grid - 1);
                        let j = Math.randomBetween(0, grid - 1);
                        item = matrix[i][j];
                    } while(item.cId != 0);
                    item.cId = k;
                }
            }
        }
    }

    actor Ring {
        costume Red("gallery:Objects/Ring Red")
        costume Blue("gallery:Objects/Ring Blue")
        when stage.started{
            this.setPosition(-300, 150);
            this.setCostume(Red);
            pairs = 0;
            sayPairs();
        }
        function sayPairs() {
            this.say("Pairs: " + pairs);
        }
    }

    actor Tiles {
        costume Alap("gallery:Objects/Apple Idle")
        costume Banana("gallery:Objects/Banana Idle")
        costume Raspberry("gallery:Objects/Raspberry Idle")
        costume Orange("gallery:Objects/Orange Idle")
        costume Cheese("gallery:Objects/Cheese Whole")
        costume Donut_Lila("gallery:Objects/Donut Purple Whole")
        costume Donut_Red("gallery:Objects/Donut Red Whole")
        costume Cake("gallery:Objects/Logi Cake Full")
        costume Gift("gallery:Objects/Gift Red")
        let cId = 0;
        when stage.started {
            this.hide();
            this.setCostume(Gift);
        }
        when cloned {
            let id = this.cloneId - 1;
            let j = id % grid;
            let i = (id - j) / grid;
            matrix[i][j] = this;
        }
        when clicked {
           if(closed && costumeId == 9){
                closed = false;
                this.setCostume(cId);
                if (flip.length < 2){
                    if(!flip[0]){
                        flip[0] = this;
                    }
                    else{
                        flip[1] = this;
                        if(flip.length == 2) {
                            if(flip[0].cId == flip[1].cId) {
                                this.wait(0.5);
                                for(let i = 1; i <= 8; i++) {
                                    flip[0].size -= 10;
                                    flip[1].size -= 10;
                                    this.wait(0.05);
                                }
                                flip[0].hide();
                                flip[1].hide();
                                pairs++;
                                Ring.sayPairs();
                                flip = [];
                            }
                            else{
                                this.wait(0.5);
                                flip[0].setCostume(9);
                                flip[1].setCostume(9);
                                flip = [];

                            }
                        }
                    }
                    closed = true;
                }
            }
        }

    }
}