/*****

 * RecyclerView 模仿淘宝购物车功能

 *

 * 删除选择商品，商品计算，选择，全选反选，商品数量加减等

 *

 */

public class MainActivity extends AppCompatActivity {

    private RecyclerView rvNestDemo;

    private CartAdapter cartAdapter;

    CartInfo cartInfo;

    double price;

    int num;

    TextView cartNum;

    TextView cartMoney;

    Button cartShoppMoular;

    CheckBox checkBox;

    private TextView btnDelete;

    @Override

    protected void onCreate(@Nullable Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        rvNestDemo = (RecyclerView) findViewById(R.id.rv_nest_demo);

        cartNum = findViewById(R.id.cart_num);

        cartMoney = findViewById(R.id.cart_money);

        cartShoppMoular = findViewById(R.id.cart_shopp_moular);

        cartShoppMoular.setOnClickListener(new OnClickListener());

        checkBox = findViewById(R.id.cbx_quanx_check);

        checkBox.setOnClickListener(new OnClickListener());

        btnDelete = (TextView) findViewById(R.id.btn_delete);

        initView();

    }

    private void initView() {

        btnDelete.setOnClickListener(new OnClickListener());

        showData();

        rvNestDemo.setLayoutManager(new LinearLayoutManager(this));

        DividerItemDecoration itemDecoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL);

        itemDecoration.setDrawable(ContextCompat.getDrawable(this, R.drawable.line_divider_inset));

        rvNestDemo.addItemDecoration(itemDecoration);

        cartAdapter = new CartAdapter(this, cartInfo.getData());

        rvNestDemo.setAdapter(cartAdapter);

        showExpandData();

    }

    private void showExpandData() {

        /**

         * 全选

         */

        cartAdapter.setOnItemClickListener(new OnViewItemClickListener() {

            @Override

            public void onItemClick(boolean isFlang, View view, int position) {

                cartInfo.getData().get(position).setIscheck(isFlang);

                int length = cartInfo.getData().get(position).getItems().size();

                for (int i = 0; i < length; i++) {

                    cartInfo.getData().get(position).getItems().get(i).setIscheck(isFlang);

                }

                cartAdapter.notifyDataSetChanged();

                showCommodityCalculation();

            }

        });

        /**

         * 计算价钱

         */

        cartAdapter.setOnItemMoneyClickListener(new OnItemMoneyClickListener() {

            @Override

            public void onItemClick(View view, int position) {

                showCommodityCalculation();

            }

        });

    }

    /***

     * 计算商品的数量和价格

     */

    private void showCommodityCalculation() {

        price = 0;

        num = 0;

        for (int i = 0; i < cartInfo.getData().size(); i++) {

            for (int j = 0; j < cartInfo.getData().get(i).getItems().size(); j++) {

                if (cartInfo.getData().get(i).getItems().get(j).ischeck()) {

                    price += Double.valueOf((cartInfo.getData().get(i).getItems().get(j).getNum() * Double.valueOf(cartInfo.getData().get(i).getItems().get(j).getPrice())));

                    num++;

                } else {

                    checkBox.setChecked(false);

                }

            }

        }

        if (price == 0.0) {

            cartNum.setText("共0件商品");

            cartMoney.setText("¥ 0.0");

            return;

        }

        try {

            String money = String.valueOf(price);

            cartNum.setText("共" + num + "件商品");

            if (money.substring(money.indexOf("."), money.length()).length() > 2) {

                cartMoney.setText("¥ " + money.substring(0, (money.indexOf(".") + 3)));

                return;

            }

            cartMoney.setText("¥ " + money.substring(0, (money.indexOf(".") + 2)));

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    private void showData() {

        cartInfo = JSON.parseObject(JSONDATA(), CartInfo.class);

    }

    private class OnClickListener implements View.OnClickListener {

        @Override

        public void onClick(View v) {

            switch (v.getId()) {

                //全选和不全选

                case R.id.cbx_quanx_check:

                    if (checkBox.isChecked()) {

                        int length = cartInfo.getData().size();

                        for (int i = 0; i < length; i++) {

                            cartInfo.getData().get(i).setIscheck(true);

                            int lengthn = cartInfo.getData().get(i).getItems().size();

                            for (int j = 0; j < lengthn; j++) {

                                cartInfo.getData().get(i).getItems().get(j).setIscheck(true);

                            }

                        }

                    } else {

                        int length = cartInfo.getData().size();

                        for (int i = 0; i < length; i++) {

                            cartInfo.getData().get(i).setIscheck(false);

                            int lengthn = cartInfo.getData().get(i).getItems().size();

                            for (int j = 0; j < lengthn; j++) {

                                cartInfo.getData().get(i).getItems().get(j).setIscheck(false);

                            }

                        }

                    }

                    cartAdapter.notifyDataSetChanged();

                    showCommodityCalculation();

                    break;

                case R.id.btn_delete:

                    //删除选中商品

                    cartAdapter.removeChecked();

                    showCommodityCalculation();

                    break;

                case R.id.cart_shopp_moular:

                    Toast.makeText(MainActivity.this,"提交订单:  "+cartMoney.getText().toString()+"元",Toast.LENGTH_LONG).show();

                    break;

            }

        }

}