react-native-navigation/lib/android/app/src/main/java/com/reactnativenavigation/presentation/BottomTabsOptionsPresenter....

package com.reactnativenavigation.presentation;

import android.view.ViewGroup;
import android.view.ViewGroup.MarginLayoutParams;

import com.reactnativenavigation.anim.BottomTabsAnimator;
import com.reactnativenavigation.parse.AnimationsOptions;
import com.reactnativenavigation.parse.BottomTabsOptions;
import com.reactnativenavigation.parse.Options;
import com.reactnativenavigation.utils.UiUtils;
import com.reactnativenavigation.viewcontrollers.ViewController;
import com.reactnativenavigation.viewcontrollers.bottomtabs.BottomTabFinder;
import com.reactnativenavigation.viewcontrollers.bottomtabs.TabSelector;
import com.reactnativenavigation.views.BottomTabs;
import com.reactnativenavigation.views.Component;

import java.util.List;

public class BottomTabsOptionsPresenter {
    private final BottomTabFinder bottomTabFinder;
    private final List<ViewController> tabs;
    private Options defaultOptions;
    private BottomTabs bottomTabs;
    private BottomTabsAnimator animator;
    private TabSelector tabSelector;

    public BottomTabsOptionsPresenter(List<ViewController> tabs, Options defaultOptions) {
        this.tabs = tabs;
        this.defaultOptions = defaultOptions;
        this.bottomTabFinder = new BottomTabFinder(tabs);
    }

    public void setDefaultOptions(Options defaultOptions) {
        this.defaultOptions = defaultOptions;
    }

    public void bindView(BottomTabs bottomTabs, TabSelector tabSelector) {
        this.bottomTabs = bottomTabs;
        this.tabSelector = tabSelector;
        animator = new BottomTabsAnimator(bottomTabs);
    }

    public void applyLayoutParamsOptions(Options options, int tabIndex) {
        Options withDefaultOptions = options.copy().withDefaultOptions(defaultOptions);
        applyDrawBehind(withDefaultOptions.bottomTabsOptions, tabIndex);
    }

    public void present(Options options) {
        Options withDefaultOptions = options.copy().withDefaultOptions(defaultOptions);
        applyBottomTabsOptions(withDefaultOptions.bottomTabsOptions, withDefaultOptions.animations);
    }

    public void presentChildOptions(Options options, Component child) {
        Options withDefaultOptions = options.copy().withDefaultOptions(defaultOptions);
        applyBottomTabsOptions(withDefaultOptions.bottomTabsOptions, withDefaultOptions.animations);
        int tabIndex = bottomTabFinder.findByComponent(child);
        applyDrawBehind(withDefaultOptions.bottomTabsOptions, tabIndex);
    }

    private void applyDrawBehind(BottomTabsOptions options, int tabIndex) {
        ViewGroup tab = tabs.get(tabIndex).getView();
        MarginLayoutParams lp = (MarginLayoutParams) tab.getLayoutParams();
        if (options.drawBehind.isTrue()) {
            lp.bottomMargin = 0;
        }
        if (options.visible.isTrueOrUndefined() && options.drawBehind.isFalseOrUndefined()) {
            if (bottomTabs.getHeight() == 0) {
                UiUtils.runOnPreDrawOnce(bottomTabs, () -> lp.bottomMargin = bottomTabs.getHeight());
            } else {
                lp.bottomMargin = bottomTabs.getHeight();
            }
        }
    }

    private void applyBottomTabsOptions(BottomTabsOptions options, AnimationsOptions animationsOptions) {
        if (options.titleDisplayMode.hasValue()) {
            bottomTabs.setTitleState(options.titleDisplayMode.toState());
        }
        if (options.backgroundColor.hasValue()) {
            bottomTabs.setBackgroundColor(options.backgroundColor.get());
        }
        if (options.currentTabIndex.hasValue()) {
            int tabIndex = options.currentTabIndex.get();
            if (tabIndex >= 0) tabSelector.selectTab(tabIndex);
        }
        if (options.testId.hasValue()) {
            bottomTabs.setTag(options.testId.get());
        }
        if (options.currentTabId.hasValue()) {
            int tabIndex = bottomTabFinder.findByControllerId(options.currentTabId.get());
            if (tabIndex >= 0) tabSelector.selectTab(tabIndex);
        }
        if (options.visible.isTrueOrUndefined()) {
            if (options.animate.isTrueOrUndefined()) {
                animator.show(animationsOptions);
            } else {
                bottomTabs.restoreBottomNavigation(false);
            }
        }
        if (options.visible.isFalse()) {
            if (options.animate.isTrueOrUndefined()) {
                animator.hide(animationsOptions);
            } else {
                bottomTabs.hideBottomNavigation(false);
            }
        }
    }
}