package org.simantics.aeri.ui.redmine;

import static org.eclipse.epp.logging.aeri.core.IModelPackage.Literals.USER_SETTINGS__ANONYMIZE_MESSAGES;
import static org.eclipse.epp.logging.aeri.core.IModelPackage.Literals.USER_SETTINGS__ANONYMIZE_STACK_TRACES;
import static org.eclipse.epp.logging.aeri.core.util.Links.REL_PRIVACY_POLICY;
import static org.eclipse.epp.logging.aeri.core.util.Links.REL_TERMS_OF_USE;

import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

import javax.inject.Inject;
import javax.inject.Named;

import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.e4.core.di.annotations.Optional;
import org.eclipse.e4.ui.services.IServiceConstants;
import org.eclipse.emf.databinding.EMFProperties;
import org.eclipse.emf.ecore.EAttribute;
import org.eclipse.epp.internal.logging.aeri.ide.IServerDescriptor;
import org.eclipse.epp.logging.aeri.core.ILink;
import org.eclipse.epp.logging.aeri.core.ISystemSettings;
import org.eclipse.epp.logging.aeri.core.util.Formats;
import org.eclipse.epp.logging.aeri.core.util.Links;
import org.eclipse.jface.databinding.swt.ISWTObservableValue;
import org.eclipse.jface.databinding.swt.WidgetProperties;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.dialogs.TitleAreaDialog;
import org.eclipse.jface.layout.GridDataFactory;
import org.eclipse.jface.layout.GridLayoutFactory;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.window.DefaultToolTip;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.program.Program;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Link;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.browser.IWebBrowser;
import org.simantics.aeri.redmine.core.settings.RedmineAERISettings;
import org.simantics.aeri.redmine.core.settings.RedmineAERISettingsPackage;

/**
 * @author jsjani
 *
 *  Very much mimicked from <a>org.eclipse.epp.internal.logging.aeri.ide.dialogs.ConfigureServerDialog</a>
 *
 */
public class RedmineCredentialsDialog extends TitleAreaDialog {

    private static final EAttribute REDMINE_SETTINGS__API_KEY = RedmineAERISettingsPackage.eINSTANCE.getRedmineAERISettings_ApiKey();

    private static Map<EAttribute, EAttribute> SYSTEM_SETTINGS_TO_SERVER = systemSettingsToServer();
        
    private static Map<EAttribute, EAttribute> systemSettingsToServer() {
        Map<EAttribute, EAttribute> result = new HashMap<>();
        result.put(USER_SETTINGS__ANONYMIZE_MESSAGES, USER_SETTINGS__ANONYMIZE_MESSAGES);
        result.put(USER_SETTINGS__ANONYMIZE_STACK_TRACES, USER_SETTINGS__ANONYMIZE_STACK_TRACES);
        return result;
    }
    
    private static final String DIALOG_TITLE_CONFIGURE_SERVER = "Configure Error Reporting for {0}";
    private static final String BUTTON_TEXT_ENABLE = "Enable";
    private static final String BUTTON_TEXT_DISABLE = "Disable";
    
    /**
     * Return code to indicate a cancel using the esc-button.
     */
    public static final int ESC_CANCEL = 42 + 42;

    private static final Point TOOLTIP_DISPLACEMENT = new Point(5, 20);
    private static final String DIALOG_MESSAGE_CONFIGURE_SERVER = "Configure the default sending and anonymization options for {0}.";
    private static final String LINK_TEXT_ENABLE_ADMONITION_WITH_TERMS_OF_USE_AND_PRIVACY_POLICY = "";
    private static final String LINK_TEXT_TERMS_OF_USE = "Terms of Use";
    private static final String LINK_TEXT_PRIVACY_POLICY = "Privacy Policy";
    private static final String LINK_TEXT_ENABLE_ADMONITION_WITH_TERMS_OF_USE = "By clicking \u2018Enable\u2019 you agree to the <a href=\"{1}\">{0}</a> of this server.";
    private static final String GROUP_TEXT_REDMINE_INFORMATION = "Redmine Information";
    private static final String FIELD_LABEL_API_KEY = "API key:";
    private static final String FIELD_MESSAGE_API_KEY = "Required. Redmine API key is used to authenticate and identify the reporter.";
    private static final String FIELD_MESSAGE_REDMINE_URL = "Location of Redmine server.";
    private static final String TOOLTIP_SETTINGS_EMAIL = "";
    private static final String FIELD_LABEL_REDMINE_URL = "URL:";
    private static final String TOOLTIP_SETTINGS_MAKE_STACKTRACE_ANONYMOUS = "";
    private static final String FIELD_LABEL_ANONYMIZE_STACKTRACES = "Anonymize package, class, and method names";
    private static final String FIELD_LABEL_ANONYMIZE_MESSAGES = "Anonymize error log messages";
    private static final String TOOLTIP_SETTINGS_MAKE_MESSAGES_ANONYMOUS = "";
    private static final String LINK_TEXT_ENABLE_ADMONITION_WITH_PRIVACY_POLICY = "By clicking \u2018Enable\u2019 you agree to the <a href=\"{1}\">{0}</a> of this server.";
    private static final String GROUP_TEXT_ANONYMIZATION = "Send Options";
    private static final String REL_REDMINE_LINK = "org.simantics.aeri.ui.redmine.redmine.link";
    private static int TOOLTIP_MS_HIDE_DELAY = 20000;

    private IServerDescriptor server;
    private DataBindingContext context;

    private RedmineAERISettings redmineSettings;

    @Inject
    public RedmineCredentialsDialog(IServerDescriptor server, RedmineAERISettings redmineSettings, ISystemSettings settings,
            @Named(IServiceConstants.ACTIVE_SHELL) @Optional Shell parentShell, ImageRegistry registry) {
        super(parentShell);
        this.server = server;
        this.redmineSettings = redmineSettings;
        setHelpAvailable(false);
        setShellStyle(SWT.SHELL_TRIM | SWT.RESIZE | SWT.SHEET);
        context = new DataBindingContext();
        copySystemDefaultsIfUnset(settings, server);
    }
    
    private static void copySystemDefaultsIfUnset(ISystemSettings source, IServerDescriptor target) {
        for (Entry<EAttribute, EAttribute> entry : SYSTEM_SETTINGS_TO_SERVER.entrySet()) {
            EAttribute toAttr = entry.getValue();
            if (!target.eIsSet(toAttr)) {
                EAttribute fromAttr = entry.getKey();
                Object value = source.eGet(fromAttr);
                target.eSet(toAttr, value);
            }
        }
    }

    @Override
    protected void createButtonsForButtonBar(Composite parent) {
        createButton(parent, IDialogConstants.OK_ID, BUTTON_TEXT_ENABLE, true);
        createButton(parent, IDialogConstants.CANCEL_ID, BUTTON_TEXT_DISABLE, false);
    }

    @Override
    public void create() {
        super.create();
        setTitle(Formats.format(DIALOG_TITLE_CONFIGURE_SERVER, server.getName()));
        ILink redmineEndpoint = Links.Link(server, REL_REDMINE_LINK);
        setMessage(Formats.format(DIALOG_MESSAGE_CONFIGURE_SERVER, redmineEndpoint.getTitle()));
    }
    
    @Override
    protected Control createDialogArea(Composite parent) {
        Composite container = new Composite(parent, SWT.NONE);
        GridLayoutFactory.fillDefaults().extendedMargins(5, 5, 5, 0).applyTo(container);
        GridDataFactory.fillDefaults().grab(true, true).applyTo(container);

        Composite personalGroup = createPersonalGroup(container);
        GridDataFactory.fillDefaults().indent(0, 10).grab(true, false).applyTo(personalGroup);

        Group makeAnonymousGroup = createAnonymizeGroup(container);
        GridDataFactory.fillDefaults().indent(0, 5).applyTo(makeAnonymousGroup);

        ILink termsOfUse = Links.Link(server, REL_TERMS_OF_USE);
        ILink privacyPolicy = Links.Link(server, REL_PRIVACY_POLICY);
        
        String legalText = null;
        if (termsOfUse != null && privacyPolicy != null) {
            legalText = Formats.format(LINK_TEXT_ENABLE_ADMONITION_WITH_TERMS_OF_USE_AND_PRIVACY_POLICY,
                    LINK_TEXT_TERMS_OF_USE, termsOfUse.getHref(),
                    LINK_TEXT_PRIVACY_POLICY, privacyPolicy.getHref());
        } else if (termsOfUse != null && privacyPolicy == null) {
            legalText = Formats.format(LINK_TEXT_ENABLE_ADMONITION_WITH_TERMS_OF_USE,
                    LINK_TEXT_TERMS_OF_USE, termsOfUse.getHref());
        } else if (termsOfUse == null && privacyPolicy != null) {
            legalText = Formats.format(LINK_TEXT_ENABLE_ADMONITION_WITH_PRIVACY_POLICY,
                    LINK_TEXT_PRIVACY_POLICY, privacyPolicy.getHref());
        }
        if (legalText != null) {
            Link termsAndConditions = new Link(container, SWT.NONE);
            termsAndConditions.setText(legalText);
            termsAndConditions.addSelectionListener(new SelectionAdapter() {
                @Override
                public void widgetSelected(SelectionEvent e) {
                    openInExternalBrowser(e.text);
                }
            });
            GridDataFactory.fillDefaults().indent(10, 10).hint(300, SWT.DEFAULT).align(SWT.FILL, SWT.CENTER).applyTo(termsAndConditions);
        }

        Dialog.applyDialogFont(container);
        return container;
    }

    // TODO Move to UI class. Similar methods in PreferencePage and SystemSettingsPage
    private Composite createPersonalGroup(Composite parent) {
        Group personalGroup = new Group(parent, SWT.NONE);
        personalGroup.setText(GROUP_TEXT_REDMINE_INFORMATION);
        GridLayoutFactory.fillDefaults().margins(5, 5).numColumns(2).applyTo(personalGroup);
        {
            ILink redmineEndpoint = Links.Link(server, REL_REDMINE_LINK);
            
            String tooltip = FIELD_MESSAGE_REDMINE_URL + '\n' + TOOLTIP_SETTINGS_EMAIL;
            Link link = createLabelWithLink(personalGroup, FIELD_LABEL_REDMINE_URL, "<A>" + redmineEndpoint.getHref() + "</A>", tooltip);
            link.addSelectionListener(new SelectionAdapter() {
                @Override
                public void widgetSelected(SelectionEvent e) {
                    openInExternalBrowser(e.text);
                }
            });
        }

        {
            Text name = createLabelWithText(personalGroup, FIELD_LABEL_API_KEY, FIELD_MESSAGE_API_KEY,
                    FIELD_MESSAGE_API_KEY);
            ISWTObservableValue swt = WidgetProperties.text(SWT.Modify).observe(name);
            IObservableValue emf = EMFProperties.value(REDMINE_SETTINGS__API_KEY).observe(redmineSettings);
            context.bindValue(swt, emf);
        }
        return personalGroup;
    }

    private Group createAnonymizeGroup(Composite container) {
        Group makeAnonymousGroup = new Group(container, SWT.SHADOW_ETCHED_IN | SWT.SHADOW_ETCHED_OUT | SWT.SHADOW_IN | SWT.SHADOW_OUT);
        makeAnonymousGroup.setLayout(new RowLayout(SWT.VERTICAL));
        makeAnonymousGroup.setText(GROUP_TEXT_ANONYMIZATION);
        {
            Button anonStackTraces = createGroupCheckButton(makeAnonymousGroup, FIELD_LABEL_ANONYMIZE_STACKTRACES,
                    TOOLTIP_SETTINGS_MAKE_STACKTRACE_ANONYMOUS);
            anonStackTraces.setFocus();
            IObservableValue swt = WidgetProperties.selection().observe(anonStackTraces);
            IObservableValue emf = EMFProperties.value(USER_SETTINGS__ANONYMIZE_STACK_TRACES).observe(server);
            context.bindValue(swt, emf);
        }
        {
            Button anonMessages = createGroupCheckButton(makeAnonymousGroup, FIELD_LABEL_ANONYMIZE_MESSAGES,
                    TOOLTIP_SETTINGS_MAKE_MESSAGES_ANONYMOUS);
            IObservableValue swt = WidgetProperties.selection().observe(anonMessages);
            IObservableValue emf = EMFProperties.value(USER_SETTINGS__ANONYMIZE_MESSAGES).observe(server);
            context.bindValue(swt, emf);
        }
        return makeAnonymousGroup;
    }

    private static Link createLabelWithLink(Composite parent, String labelText, String linkText, String toolTip) {
        createLabel(parent, labelText, toolTip);
        
        Link link = new Link(parent, SWT.NONE);
        link.setText(linkText);
        return link;
    }
    
    private static Text createLabelWithText(Composite parent, String labelText, String textMessage, String toolTip) {
        createLabel(parent, labelText, toolTip);
        
        Text text = new Text(parent, SWT.BORDER);
        text.setMessage(textMessage);
        calibrateTooltip(new DefaultToolTip(text), toolTip);
        GridDataFactory.fillDefaults().grab(true, false).applyTo(text);
        return text;
    }
    
    private static void createLabel(Composite parent, String labelText, String toolTip) {
        Label label = new Label(parent, SWT.NONE);
        label.setText(labelText);
        calibrateTooltip(new DefaultToolTip(label), toolTip);
    }
    
    private static Button createGroupCheckButton(Group group, String buttonText, String toolTipText) {
        Button button = new Button(group, SWT.CHECK);
        button.setText(buttonText);
        calibrateTooltip(new DefaultToolTip(button), toolTipText);
        return button;
    }

    private static void calibrateTooltip(DefaultToolTip toolTip, String toolTipText) {
        toolTip.setText(toolTipText);
        toolTip.setFont(JFaceResources.getDialogFont());
        toolTip.setShift(TOOLTIP_DISPLACEMENT);
        toolTip.setHideDelay(TOOLTIP_MS_HIDE_DELAY);
    }
    
    @Override
    protected void okPressed() {
        server.setEnabled(true);
        super.okPressed();
    }

    @Override
    protected void cancelPressed() {
        server.setEnabled(false);
        super.cancelPressed();
    }
    
    /**
     * Tries to open an URL with an external web browser. If one is configure in the Eclipse preferences (General &gt; Web Browser) it will
     * prefer that over the operating system's default browser. If either way to open an external browser does not succeed, this method will
     * this will open a new editor to display the URL within the Eclipse IDE.
     */
    private static void openInExternalBrowser(String url) {
        try {
            IWebBrowser externalBrowser = PlatformUI.getWorkbench().getBrowserSupport().getExternalBrowser();
            externalBrowser.openURL(new URL(url));
        } catch (Throwable e) {
            try {
                if (!Program.launch(url)) {
                    openInDefaultBrowser(url);
                }
            } catch (Throwable t) {
                t.printStackTrace();
            }
        }
    }

    /**
     * Tries to open an URL wit the web browser configured in the Eclipse preferences (General &gt; Web Browser). By default, this will open
     * a new editor to display the URL within the Eclipse IDE.
     */
    private static void openInDefaultBrowser(String url) {
        try {
            IWebBrowser defaultBrowser = PlatformUI.getWorkbench().getBrowserSupport().createBrowser(null);
            defaultBrowser.openURL(new URL(url));
        } catch (Throwable t) {
            // Ignore failure; this method is best effort.
            t.printStackTrace();
        }
    }

}