MTU-Dining/app/src/main/java/com/thebrokenrail/mtudining/activity/menu/MenuAdapter.java

package com.thebrokenrail.mtudining.activity.menu;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.google.android.material.textfield.MaterialAutoCompleteTextView;
import com.google.android.material.textfield.TextInputLayout;
import com.thebrokenrail.mtudining.R;
import com.thebrokenrail.mtudining.activity.task.Task;
import com.thebrokenrail.mtudining.activity.task.TaskAdapter;
import com.thebrokenrail.mtudining.api.method.PeriodDetail;
import com.thebrokenrail.mtudining.util.Category;
import com.thebrokenrail.mtudining.util.DateUtil;
import com.thebrokenrail.mtudining.widget.CategoryView;
import com.thebrokenrail.mtudining.widget.CustomDropDownView;

import java.util.Date;

/**
 * Adapter for listing dining halls.
 */
class MenuAdapter extends TaskAdapter<MenuData> {
    /**
     * Current state.
     */
    private final MenuState state;

    MenuAdapter(Task<MenuData> task, MenuState state) {
        super(task);
        this.state = state;
    }

    @Override
    protected View createItemView(@NonNull ViewGroup parent) {
        // Create View
        CategoryView category = new CategoryView(parent.getContext(), null);
        RecyclerView.LayoutParams layoutParams = new RecyclerView.LayoutParams(RecyclerView.LayoutParams.MATCH_PARENT, RecyclerView.LayoutParams.WRAP_CONTENT);
        category.setLayoutParams(layoutParams);
        return category;
    }

    /**
     * Get currently selected meal.
     * @return A meal menu
     */
    private MenuData.Meal getMeal() {
        if (getResult() != null) {
            String selectedMeal = state.getSelectedMeal();
            for (MenuData.Meal meal : getResult().meals) {
                if (meal.name.equals(selectedMeal)) {
                    // Found Meal
                    return meal;
                }
            }
        }
        // Could Not Find Meal
        return null;
    }

    @Override
    protected void bindItemView(View view, int position) {
        MenuData.Meal meal = getMeal();
        assert meal != null;
        Category<PeriodDetail.Response.Menu.PeriodData.MenuCategory.MenuItem> data = meal.categories.get(position - getFirstElementPosition());
        // Setup View
        CategoryView category = (CategoryView) view;
        category.setup(data, () -> {
            // Open/Close Category
            data.isOpen = !data.isOpen;
            notifyItemChanged(meal.categories.indexOf(data) + getFirstElementPosition());
        }, item -> {
            // Show Dialog
            ItemDialog.show(view.getContext(), item);
        });
    }

    @Override
    protected int getDataSize() {
        MenuData.Meal meal = getMeal();
        if (meal != null) {
            return meal.categories.size();
        } else {
            return 0;
        }
    }

    @Override
    protected View createHeader(@NonNull ViewGroup parent) {
        // Inflate Header XML
        LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
        return layoutInflater.inflate(R.layout.menu_header, parent, false);
    }

    @Override
    protected void bindHeader(View view) {
        // Set Date
        CustomDropDownView dateField = view.findViewById(R.id.menu_date_field);
        MaterialAutoCompleteTextView date = view.findViewById(R.id.menu_date);
        Date current = state.getDate();
        date.setText(DateUtil.toString(current));
        // Handle Click
        dateField.setup();
        dateField.setOnDropDown(() -> {
            // Open Date Picker
            MenuDatePicker.show(current, ((MenuActivity) view.getContext()).getSupportFragmentManager());
        });

        // Set Meal
        boolean isLoaded = getResult() != null;
        TextInputLayout mealField = view.findViewById(R.id.menu_meal_field);
        MaterialAutoCompleteTextView meal = view.findViewById(R.id.menu_meal);
        if (isLoaded) {
            // Enable/Disable Field
            isLoaded = getResult().meals.size() > 0;
            mealField.setEnabled(isLoaded);
            if (isLoaded) {
                // Set Dropdown Options
                meal.setSimpleItems(getResult().meals.stream().map(x -> x.name).toArray(String[]::new));
                // Set Selection
                meal.setText(state.getSelectedMeal(), false);
                // Handle Meal Selection
                meal.setOnItemClickListener((parent, view1, position, id) -> {
                    // Get New Meal
                    String newMeal = (String) parent.getAdapter().getItem(position);
                    // Update UI
                    if (!newMeal.equals(state.getSelectedMeal())) {
                        int oldItemCount = getItemCount();
                        state.setSelectedMeal(newMeal);
                        reloadUI(oldItemCount);
                    }
                });
            } else {
                // Show N/A
                meal.setText(meal.getResources().getString(R.string.not_available), false);
            }
        } else {
            // Disable Field
            mealField.setEnabled(false);
            // Show No Text
            meal.setText("", false);
        }
    }
}