// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package org.chromium.chrome.browser.tabmodel.document;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Browser;

import org.chromium.base.ApiCompatibilityUtils;
import org.chromium.base.ContextUtils;
import org.chromium.chrome.browser.IntentHandler;
import org.chromium.chrome.browser.ServiceTabLauncher;
import org.chromium.chrome.browser.TabState;
import org.chromium.chrome.browser.document.ChromeLauncherActivity;
import org.chromium.chrome.browser.multiwindow.MultiWindowUtils;
import org.chromium.chrome.browser.tab.Tab;
import org.chromium.chrome.browser.tab.TabIdManager;
import org.chromium.chrome.browser.tabmodel.AsyncTabParamsManager;
import org.chromium.chrome.browser.tabmodel.TabCreatorManager.TabCreator;
import org.chromium.chrome.browser.tabmodel.TabModel.TabLaunchType;
import org.chromium.content_public.browser.LoadUrlParams;
import org.chromium.content_public.browser.WebContents;
import org.chromium.ui.base.PageTransition;

import java.util.Map;

/**
 * Asynchronously creates Tabs by creating/starting up Activities.
 */
public class TabDelegate extends TabCreator {
    private final boolean mIsIncognito;

    /**
     * Creates a TabDelegate.
     * @param incognito Whether or not the TabDelegate handles the creation of incognito tabs.
     */
    public TabDelegate(boolean incognito) {
        mIsIncognito = incognito;
    }

    @Override
    public boolean createsTabsAsynchronously() {
        return true;
    }

    /**
     * Creates a frozen Tab.  This Tab is not meant to be used or unfrozen -- it is only used as a
     * placeholder until the real Tab can be created.
     * The index is ignored in DocumentMode because Android handles the ordering of Tabs.
     */
    @Override
    public Tab createFrozenTab(TabState state, int id, int index) {
        return Tab.createFrozenTabFromState(id, null, state.isIncognito(), null,
                Tab.INVALID_TAB_ID, state);
    }

    @Override
    public boolean createTabWithWebContents(Tab parent, WebContents webContents, int parentId,
            TabLaunchType type, String url) {
        if (url == null) url = "";

        AsyncTabCreationParams asyncParams =
                new AsyncTabCreationParams(
                        new LoadUrlParams(url, PageTransition.AUTO_TOPLEVEL), webContents);
        createNewTab(asyncParams, type, parentId);
        return true;
    }

    /**
     * Creates a tab in the "other" window in multi-window mode. This will only work if
     * {@link MultiWindowUtils#isOpenInOtherWindowSupported} is true for the given activity.
     *
     * @param loadUrlParams Parameters specifying the URL to load and other navigation details.
     * @param activity      The current {@link Activity}
     * @param parentId      The ID of the parent tab, or {@link Tab#INVALID_TAB_ID}.
     */
    public void createTabInOtherWindow(LoadUrlParams loadUrlParams, Activity activity,
            int parentId) {
        Intent intent = createNewTabIntent(
                new AsyncTabCreationParams(loadUrlParams), parentId, false);

        Class<? extends Activity> targetActivity =
                MultiWindowUtils.getInstance().getOpenInOtherWindowActivity(activity);
        if (targetActivity == null) return;

        MultiWindowUtils.setOpenInOtherWindowIntentExtras(intent, activity, targetActivity);
        IntentHandler.addTrustedIntentExtras(intent);
        MultiWindowUtils.onMultiInstanceModeStarted();
        activity.startActivity(intent);
    }

    @Override
    public Tab launchUrl(String url, TabLaunchType type) {
        return createNewTab(new LoadUrlParams(url), type, null);
    }

    @Override
    public Tab createNewTab(LoadUrlParams loadUrlParams, TabLaunchType type, Tab parent) {
        AsyncTabCreationParams asyncParams = new AsyncTabCreationParams(loadUrlParams);
        createNewTab(asyncParams, type, parent == null ? Tab.INVALID_TAB_ID : parent.getId());
        return null;
    }

    /**
     * Creates a Tab to host the given WebContents asynchronously.
     * @param asyncParams     Parameters to create the Tab with, including the URL.
     * @param type            Information about how the tab was launched.
     * @param parentId        ID of the parent tab, if it exists.
     */
    public void createNewTab(
            AsyncTabCreationParams asyncParams, TabLaunchType type, int parentId) {
        assert asyncParams != null;

        // Tabs should't be launched in affiliated mode when a webcontents exists.
        assert !(type == TabLaunchType.FROM_LONGPRESS_BACKGROUND
                && asyncParams.getWebContents() != null);

        Intent intent = createNewTabIntent(
                asyncParams, parentId, type == TabLaunchType.FROM_CHROME_UI);
        IntentHandler.startActivityForTrustedIntent(intent);
    }

    private Intent createNewTabIntent(
            AsyncTabCreationParams asyncParams, int parentId, boolean isChromeUI) {
        int assignedTabId = TabIdManager.getInstance().generateValidId(Tab.INVALID_TAB_ID);
        AsyncTabParamsManager.add(assignedTabId, asyncParams);

        Intent intent = new Intent(
                Intent.ACTION_VIEW, Uri.parse(asyncParams.getLoadUrlParams().getUrl()));

        addAsyncTabExtras(asyncParams, parentId, isChromeUI, assignedTabId, intent);

        return intent;
    }

    protected final void addAsyncTabExtras(AsyncTabCreationParams asyncParams, int parentId,
            boolean isChromeUI, int assignedTabId, Intent intent) {
        ComponentName componentName = asyncParams.getComponentName();
        if (componentName == null) {
            intent.setClass(ContextUtils.getApplicationContext(), ChromeLauncherActivity.class);
        } else {
            intent.setComponent(componentName);
        }

        Map<String, String> extraHeaders = asyncParams.getLoadUrlParams().getExtraHeaders();
        if (extraHeaders != null && !extraHeaders.isEmpty()) {
            Bundle bundle = new Bundle();
            for (Map.Entry<String, String> header : extraHeaders.entrySet()) {
                bundle.putString(header.getKey(), header.getValue());
            }
            intent.putExtra(Browser.EXTRA_HEADERS, bundle);
        }

        intent.putExtra(IntentHandler.EXTRA_TAB_ID, assignedTabId);
        intent.putExtra(IntentHandler.EXTRA_OPEN_NEW_INCOGNITO_TAB, mIsIncognito);
        intent.putExtra(IntentHandler.EXTRA_PARENT_TAB_ID, parentId);

        if (mIsIncognito || isChromeUI) {
            intent.putExtra(Browser.EXTRA_APPLICATION_ID,
                    ContextUtils.getApplicationContext().getPackageName());
        }

        if (isChromeUI) intent.putExtra(Browser.EXTRA_CREATE_NEW_TAB, true);

        Activity parentActivity = ActivityDelegate.getActivityForTabId(parentId);
        if (parentActivity != null && parentActivity.getIntent() != null) {
            intent.putExtra(IntentHandler.EXTRA_PARENT_INTENT, parentActivity.getIntent());
        }

        if (asyncParams.getRequestId() != null) {
            intent.putExtra(ServiceTabLauncher.LAUNCH_REQUEST_ID_EXTRA,
                    asyncParams.getRequestId().intValue());
        }

        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    }

    /**
     * Passes the supplied web app launch intent to the IntentHandler.
     * @param intent Web app launch intent.
     */
    public void createNewStandaloneFrame(Intent intent) {
        assert intent != null;
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                | ApiCompatibilityUtils.getActivityNewDocumentFlag());
        IntentHandler.startActivityForTrustedIntent(intent);
    }
}