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package com.arellomobile.mvp;

import java.util.Collections;
import java.util.Set;
import java.util.WeakHashMap;

import com.arellomobile.mvp.presenter.PresenterType;
import com.arellomobile.mvp.viewstate.MvpViewState;

/**
 * Date: 15.12.2015
 * Time: 19:31
 *
 * @author Yuri Shmakov
 * @author Alexander Blinov
 * @author Konstantin Tckhovrebov
 */
public abstract class MvpPresenter {
	private boolean mFirstLaunch = true;
	private String mTag;
	private PresenterType mPresenterType;
	private Set mViews;
	private View mViewStateAsView;
	private MvpViewState mViewState;
	private Class mPresenterClass;

	public MvpPresenter() {
		Binder.bind(this);

		mViews = Collections.newSetFromMap(new WeakHashMap());
	}

	/**
	 * Attach view to view state or to presenter(if view state not exists).
	 * If you use {@link MvpDelegate}, you should not call this method directly.
	 * It will be called on {@link MvpDelegate#onAttach()}, if view does not attached.
	 *
	 * @param view to attachment
	 */
	public void attachView(View view) {
		if (mViewState != null) {
			mViewState.attachView(view);
		} else {
			mViews.add(view);
		}
		if (mFirstLaunch) {
			mFirstLaunch = false;

			onFirstViewAttach();
		}
	}

	/**
	 * Callback after first presenter init and view binding. If this
	 * presenter instance will have to attach some view in future, this method
	 * will not be called.
	 * There you can to interact with {@link #mViewState}.
	 */
	protected void onFirstViewAttach() {
	}

	/**
	 * Detach view from view state or from presenter(if view state not exists).
	 * If you use {@link MvpDelegate}, you should not call this method directly.
	 * It will be called on {@link MvpDelegate#onDetach()}.
	 *
	 * @param view view to detach
	 */
	@SuppressWarnings("WeakerAccess")
	public void detachView(View view) {
		if (mViewState != null) {
			mViewState.detachView(view);
		} else {
			mViews.remove(view);
		}
	}

	public void destroyView(View view) {
		if (mViewState != null) {
			mViewState.destroyView(view);
		}
	}

	/**
	 * @return views attached to view state, or attached to presenter(if view state not exists)
	 */
	@SuppressWarnings("WeakerAccess")
	public Set getAttachedViews() {
		if (mViewState != null) {
			return mViewState.getViews();
		}

		return mViews;
	}

	/**
	 * @return view state, casted to view interface for simplify
	 */
	@SuppressWarnings("WeakerAccess")
	public View getViewState() {
		return mViewStateAsView;
	}

	/**
	 * Check if view is in restore state or not
	 *
	 * @param view view for check
	 * @return true if view state restore state to incoming view. false otherwise.
	 */
	@SuppressWarnings("unused")
	public boolean isInRestoreState(View view) {
		//noinspection SimplifiableIfStatement
		if (mViewState != null) {
			return mViewState.isInRestoreState(view);
		}
		return false;
	}

	/**
	 * Set view state to presenter
	 *
	 * @param viewState that implements type, setted as View generic param
	 */
	@SuppressWarnings({"unchecked", "unused"})
	public void setViewState(MvpViewState viewState) {
		mViewStateAsView = (View) viewState;
		mViewState = (MvpViewState) viewState;
	}

	PresenterType getPresenterType() {
		return mPresenterType;
	}

	void setPresenterType(PresenterType presenterType) {
		mPresenterType = presenterType;
	}

	String getTag() {
		return mTag;
	}

	void setTag(String tag) {
		mTag = tag;
	}

	void setPresenterClass(Class presenterClass) {
		mPresenterClass = presenterClass;
	}

	Class getPresenterClass() {
		return mPresenterClass;
	}

	/**
	 * Called before reference on this presenter will be cleared and instance of presenter
	 * will be never used.
	 */
	public void onDestroy() {
	}

	private static class Binder {
		static void bind(MvpPresenter presenter) {
			MvpView viewState = (MvpView) MoxyReflector.getViewState(presenter.getClass());

			presenter.mViewStateAsView = viewState;
			presenter.mViewState = (MvpViewState) viewState;
		}
	}
}