package me.panavtec.wizard;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.ActionBarActivity;

/**
 * Encapsulates navigation operations between fragments of an activity using BackStack
 * The first fragment on PageList will act like a root fragment
 */
public class Wizard implements FragmentManager.OnBackStackChangedListener {

    private final ActionBarActivity activity;
    private final WizardPage[] pages;
    private final int containerId;
    private final int enterAnimation;
    private final int exitAnimation;
    private final int popEnterAnimation;
    private final int popExitAnimation;
    private final WizardPageListener pageListener;
    private final WizardListener wizardListener;

    protected Wizard(ActionBarActivity activity, WizardPage[] pages, int containerId, WizardPageListener pageListener,
                     WizardListener wizardListener, int enterAnimation, int exitAnimation, int popEnterAnimation, int popExitAnimation) {
        this.activity = activity;
        this.pages = pages;
        this.containerId = containerId;
        this.pageListener = pageListener;
        this.wizardListener = wizardListener;
        this.enterAnimation = enterAnimation;
        this.exitAnimation = exitAnimation;
        this.popEnterAnimation = popEnterAnimation;
        this.popExitAnimation = popExitAnimation;
    }

    public void init() {
        FragmentManager fragmentManager = activity.getSupportFragmentManager();
        fragmentManager.addOnBackStackChangedListener(this);
        WizardPage firstPage = pages[0];
        fragmentManager.beginTransaction().replace(containerId, firstPage.createFragment()).commit();
        fragmentManager.executePendingTransactions();
        if (firstPage.hasOptionMenu()) {
            activity.supportInvalidateOptionsMenu();
        }
        firstPage.setupActionBar(activity.getSupportActionBar());
    }

    public boolean returnToFirst() {
        FragmentManager fragmentManager = activity.getSupportFragmentManager();
        if (fragmentManager.getBackStackEntryCount() > 0) {
            String name = fragmentManager.getBackStackEntryAt(0).getName();
            fragmentManager.popBackStackImmediate(name, FragmentManager.POP_BACK_STACK_INCLUSIVE);
            return true;
        }
        return false;
    }

    public boolean navigatePrevious() {
        FragmentManager fragmentManager = activity.getSupportFragmentManager();
        if (fragmentManager.getBackStackEntryCount() > 0) {
            fragmentManager.popBackStackImmediate();
            fragmentManager.executePendingTransactions();
            return true;
        }
        return false;
    }

    public boolean onBackPressed() {
        return getCurrentPage().allowsBackNavigation();
    }

    public boolean navigateNext() {
        FragmentManager fragmentManager = activity.getSupportFragmentManager();
        int nextStep = fragmentManager.getBackStackEntryCount() + 1;
        if (nextStep < pages.length) {
            WizardPage WizardPage = pages[nextStep];
            Fragment fragment = WizardPage.createFragment();
            fragmentManager
                    .beginTransaction()
                    .addToBackStack(fragment.getClass().getName())
                    .setCustomAnimations(enterAnimation, exitAnimation, popEnterAnimation, popExitAnimation)
                    .replace(containerId, fragment)
                    .commit();
            fragmentManager.executePendingTransactions();
            return true;
        } else {
            if (wizardListener != null) {
                wizardListener.onWizardFinished();
            }
            return false;
        }
    }

    private WizardPage getCurrentPage() {
        return pages[activity.getSupportFragmentManager().getBackStackEntryCount()];
    }

    public Fragment getCurrent() {
        return activity.getSupportFragmentManager().findFragmentById(containerId);
    }

    public int getCurrentIndex(){
        return activity.getSupportFragmentManager().getBackStackEntryCount();
    }

    @Override public void onBackStackChanged() {
        int currentPageIndex = activity.getSupportFragmentManager().getBackStackEntryCount();
        WizardPage currentPage = pages[currentPageIndex];
        currentPage.setupActionBar(activity.getSupportActionBar());
        if (currentPage.hasOptionMenu()) {
            activity.supportInvalidateOptionsMenu();
        }
        if (pageListener != null) {
            pageListener.onPageChanged(currentPageIndex, currentPage);
        }
    }

    public static class Builder extends WizardBuilder {
        public Builder(ActionBarActivity activity, WizardPage... pages) {
            super(activity, pages);
        }
    }

}

@@ -3591,30 +3591,16 @@
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@@ -3613,36 +3613,32 @@
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Fix code style