// This file is part of GNOME Boxes. License: LGPLv2+

private enum Boxes.WizardPage {
    INTRODUCTION,
    SOURCE,
    PREPARATION,
    SETUP,
    REVIEW,

    LAST,
}

private class Boxes.Wizard: Boxes.UI {
    public override Clutter.Actor actor { get { return gtk_actor; } }

    private GtkClutter.Actor gtk_actor;
    private Boxes.App app;
    private GenericArray<Gtk.Label> steps;
    private Gtk.Notebook notebook;
    private Gtk.Button back_button;
    private Gtk.Button next_button;
    private Boxes.WizardSource wizard_source;
    private WizardSummary summary;
    private CollectionSource? source;
    private Gtk.ProgressBar prep_progress;
    private Gtk.VBox setup_vbox;
    private Gtk.Label review_label;
    private Gtk.Image installer_image;

    private MediaManager media_manager;
    private VMCreator vm_creator;

    private InstallerMedia? install_media;

    private WizardPage _page;
    private WizardPage page {
        get { return _page; }
        set {
            var forwards = value > page;

            switch (value) {
            case WizardPage.INTRODUCTION:
                next_button.sensitive = true;
                next_button.grab_focus (); // FIXME: doesn't work?!
                break;

            case WizardPage.SOURCE:
                // reset page to notify deeply widgets states
                wizard_source.page = wizard_source.page;
                break;
            }

            if (forwards) {
                switch (value) {
                case WizardPage.PREPARATION:
                    if (!prepare ())
                        return;
                    break;

                case WizardPage.SETUP:
                    if (!setup ())
                        return;
                    break;

                case WizardPage.REVIEW:
                    if (!review ())
                        return;
                    break;

                case WizardPage.LAST:
                    create.begin ((source, result) => {
                        if (create.end (result))
                            app.ui_state = UIState.COLLECTION;
                        else
                            app.notificationbar.display_error (_("Box creation failed!"));
                    });
                    return;
                }
            }

            if (skip_page (value)) {
                page = forwards ? value + 1 : value - 1;
                return;
            }

            _page = value;
            notebook.set_current_page (value);

            for (var i = 0; i < steps.length; i++) {
                var label = steps.get (i);
                label.modify_fg (Gtk.StateType.NORMAL, null);
            }

            /* highlight in white current page label */
            steps.get (page).modify_fg (Gtk.StateType.NORMAL, get_color ("white"));

            back_button.sensitive = page != WizardPage.INTRODUCTION;
            next_button.label = page != WizardPage.REVIEW ? _("C_ontinue") : _("C_reate");
        }
    }

    construct {
        steps = new GenericArray<Gtk.Label> ();
        steps.length = WizardPage.LAST;
        media_manager = new MediaManager ();
    }

    public Wizard (App app) {
        this.app = app;
        vm_creator = new VMCreator (app);
        wizard_source = new Boxes.WizardSource (app, media_manager);
        wizard_source.notify["page"].connect(() => {
            if (wizard_source.page == Boxes.SourcePage.MAIN)
                next_button.sensitive = false;
        });
        wizard_source.url_entry.changed.connect (() => {
            next_button.sensitive = wizard_source.uri.length != 0;

            var text = _("Please enter desktop or collection URI");
            var icon = "preferences-desktop-remote-desktop";
            try {
                prepare_for_location (this.wizard_source.uri, true);

                if (source != null && source.source_type == "libvirt") {
                    text = _("Will add boxes for all systems available from this account.");
                    icon = "network-workgroup";
                } else
                    text = _("Will add a single box.");

            } catch (GLib.Error error) {
                // ignore any parsing error
            }

            wizard_source.update_url_page (_("Desktop Access"), text, icon);
        });

        wizard_source.url_entry.activate.connect(() => {
            page = page + 1;
        });

        setup_ui ();
    }

    private async bool create () {
        if (source == null) {
            if (install_media == null)
                return false;

            next_button.sensitive = false;
            try {
                yield vm_creator.create_and_launch_vm (install_media, null);
            } catch (IOError.CANCELLED cancel_error) { // We did this, so ignore!
            } catch (GLib.Error error) {
                warning (error.message);
                return false;
            }

            install_media = null;
            wizard_source.uri = "";

            return true;
        }

        source.save ();
        app.add_collection_source (source);
        return true;
    }

    private void prepare_for_location (string location, bool probing = false) throws GLib.Error {
        source = null;

        if (location == "")
            throw new Boxes.Error.INVALID ("empty location");

        var file = File.new_for_commandline_arg (location);

        if (file.is_native ()) {
            // FIXME: We should able to handle non-local URIs here too
            if (!probing)
                prepare_for_installer (file.get_path ());
        } else {
            bool uncertain;
            var uri = file.get_uri ();

            var mimetype = ContentType.guess (uri, null, out uncertain);

            if (uncertain)
                prepare_for_uri (uri);
            else
                debug ("FIXME: %s".printf (mimetype));
        }
    }

    private void prepare_for_uri (string uri_as_text) throws Boxes.Error {
        var uri = Xml.URI.parse (uri_as_text);

        if (uri == null)
            throw new Boxes.Error.INVALID (_("Invalid URI"));

        source = new CollectionSource (uri.server ?? uri_as_text, uri.scheme, uri_as_text);

        if (uri.scheme == "spice" ||
            uri.scheme == "vnc") {
            // accept any vnc:// or spice:// uri
        } else if (uri.scheme.has_prefix ("qemu")) {
            // accept any qemu..:// uri
            source.source_type = "libvirt";
        } else
            throw new Boxes.Error.INVALID (_("Unsupported protocol '%s'").printf (uri.scheme));
    }

    private void prepare_for_installer (string path) throws GLib.Error {
        next_button.sensitive = false;
        media_manager.create_installer_media_for_path.begin (path, null, on_installer_media_instantiated);
    }

    private void on_installer_media_instantiated (Object? source_object, AsyncResult result) {
        next_button.sensitive = true;

        try {
            install_media = media_manager.create_installer_media_for_path.end (result);
            fetch_os_logo (installer_image, install_media.os, 128);
            prep_progress.fraction = 1.0;
            page = page + 1;
        } catch (IOError.CANCELLED cancel_error) { // We did this, so no warning!
        } catch (GLib.Error error) {
            app.notificationbar.display_error (error.message);
            page = page - 1;
        }
    }

    private bool prepare () {
        installer_image.set_from_icon_name ("media-optical", 0); // Reset

        if (this.wizard_source.install_media != null) {
            install_media = this.wizard_source.install_media;
            prep_progress.fraction = 1.0;
            page = WizardPage.SETUP;

            return false;
        } else {
            try {
                prepare_for_location (this.wizard_source.uri);
            } catch (GLib.Error error) {
                app.notificationbar.display_error (error.message);

                return false;
            }

            return true;
        }
    }

    private bool setup () {
        if (source != null)
            return true;

        foreach (var child in setup_vbox.get_children ())
            setup_vbox.remove (child);

        var skip_to = page;
        if (install_media == null || install_media.live)
            // No setup or review required for unknown and live media
            skip_to = WizardPage.LAST;
        else if (!(install_media is UnattendedInstaller))
            // Nothing to do so just skip to the next page but let the current page change complete first
            skip_to = WizardPage.REVIEW;

        if (skip_to != page) {
            page = skip_to;

            return false;
        }

        var installer = install_media as UnattendedInstaller;
        installer.populate_setup_vbox (setup_vbox);
        setup_vbox.show_all ();

        return true;
    }

    private bool review () {
        if (install_media != null && install_media is UnattendedInstaller) {
            try {
                (install_media as UnattendedInstaller).check_needed_info ();
            } catch (UnattendedInstallerError.SETUP_INCOMPLETE error) {
                app.notificationbar.display_error (error.message);

                return false;
            }
        }

        summary.clear ();

        review_label.set_text (_("Will create a new box with the following properties:"));

        if (source != null) {
            var uri = Xml.URI.parse (source.uri);

            summary.add_property (_("Type"), source.source_type);

            if (uri != null && uri.server != null)
                summary.add_property (_("Host"), uri.server.down ());
            else
                summary.add_property (_("URI"), source.uri.down ());

            switch (uri.scheme) {
            case "spice":
                var query = new Query (uri.query_raw ?? uri.query);

                summary.add_property (_("Port"), query.get ("port"));
                summary.add_property (_("TLS Port"), query.get ("tls-port"));
                break;

            case "vnc":
                if (uri.port > 0)
                    summary.add_property (_("Port"), uri.port.to_string ());
                break;
            }

            if (source.source_type == "libvirt") {
                review_label.set_text (_("Will add boxes for all systems available from this account:"));
            }
        } else if (install_media != null) {
            summary.add_property (_("System"), install_media.label);

            if (install_media is UnattendedInstaller) {
                var media = install_media as UnattendedInstaller;
                if (media.express_install) {
                    summary.add_property (_("Username"), media.username);
                    summary.add_property (_("Password"), media.hidden_password);
                }
            }

            var memory = format_size (install_media.resources.ram, FormatSizeFlags.IEC_UNITS);
            summary.add_property (_("Memory"), memory);
            memory = format_size (install_media.resources.storage, FormatSizeFlags.IEC_UNITS);
            summary.add_property (_("Disk"),  _("%s maximum".printf (memory)));
        }

        return true;
    }

    private void add_step (Gtk.Widget widget, string title, WizardPage page) {
        notebook.append_page (widget, null);

        /* sidebar */
        var vbox = app.sidebar.notebook.get_nth_page (Boxes.SidebarPage.WIZARD) as Gtk.VBox;

        var label = new Gtk.Label (title);
        label.margin_left = 25;
        label.get_style_context ().add_class ("boxes-step-label");
        label.set_halign (Gtk.Align.START);
        vbox.pack_start (label, false, false, 10);

        vbox.show_all ();
        steps.set (page, label);
    }

    private bool skip_page (Boxes.WizardPage page) {
        var backwards = page < this.page;

        // remote-display case
        if (this.source != null &&
            Boxes.WizardPage.SOURCE < page < Boxes.WizardPage.REVIEW)
            return true;

        if (backwards &&
            page == Boxes.WizardPage.PREPARATION)
            return true;

        return false;
    }

    private void setup_ui () {
        notebook = new Gtk.Notebook ();
        notebook.show_tabs = false;
        notebook.get_style_context ().add_class ("boxes-bg");
        gtk_actor = new GtkClutter.Actor.with_contents (notebook);

        /* Introduction */
        var hbox = new Gtk.HBox (false, 10);
        add_step (hbox, _("Introduction"), WizardPage.INTRODUCTION);
        hbox.add (new Gtk.Image.from_file (get_pixmap ("boxes-create.png")));
        var label = new Gtk.Label (null);
        label.get_style_context ().add_class ("boxes-wizard-label");
        label.set_markup (_("Creating a Box will allow you to use another operating system directly from your existing login.\n\nYou may connect to an existing machine <b><i>over the network</i></b> or create a <b><i>virtual machine</i></b> that runs locally on your own."));
        label.set_use_markup (true);
        label.wrap = true;
        label.halign = Gtk.Align.START;
        hbox.add (label);
        hbox.show_all ();

        /* Source */
        var vbox = new Gtk.VBox (false, 30);
        vbox.valign = Gtk.Align.CENTER;
        vbox.halign = Gtk.Align.CENTER;
        vbox.margin = 15;
        add_step (vbox, _("Source Selection"), WizardPage.SOURCE);
        label = new Gtk.Label (_("Insert operating system installation media or select a source below"));
        label.get_style_context ().add_class ("boxes-wizard-label");
        label.wrap = true;
        label.xalign = 0.0f;
        vbox.pack_start (label, false, false);
        vbox.pack_start (wizard_source.widget, false, false);
        wizard_source.widget.hexpand = true;
        wizard_source.widget.halign = Gtk.Align.CENTER;
        label = new Gtk.Label (_("Any trademarks shown above are used merely for identification of software products you have already obtained and are the property of their respective owners."));
        label.get_style_context ().add_class ("boxes-logo-notice-label");
        label.wrap = true;
        label.max_width_chars = 50;
        vbox.pack_start (label, false, false);
        vbox.show_all ();

        /* Preparation */
        vbox = new Gtk.VBox (false, 30);
        vbox.valign = Gtk.Align.CENTER;
        vbox.halign = Gtk.Align.CENTER;
        vbox.margin = 15;
        add_step (vbox, _("Preparation"), WizardPage.PREPARATION);
        label = new Gtk.Label (_("Preparing to create new box"));
        label.get_style_context ().add_class ("boxes-wizard-label");
        label.wrap = true;
        label.xalign = 0.0f;
        vbox.pack_start (label, false, false);

        hbox = new Gtk.HBox (false, 10);
        hbox.valign = Gtk.Align.CENTER;
        hbox.halign = Gtk.Align.CENTER;
        vbox.pack_start (hbox, true, true);

        installer_image = new Gtk.Image.from_icon_name ("media-optical", 0);
        installer_image.pixel_size = 128;
        hbox.pack_start (installer_image, false, false);
        var prep_vbox = new Gtk.VBox (true, 10);
        prep_vbox.valign = Gtk.Align.CENTER;
        hbox.pack_start (prep_vbox, true, true);
        label = new Gtk.Label (_("Analyzing installer media."));
        label.get_style_context ().add_class ("boxes-wizard-label");
        prep_vbox.pack_start (label, false, false);
        prep_progress = new Gtk.ProgressBar ();
        prep_vbox.pack_start (prep_progress, false, false);
        vbox.show_all ();

        /* Setup */
        setup_vbox = new Gtk.VBox (false, 30);
        setup_vbox.valign = Gtk.Align.CENTER;
        setup_vbox.halign = Gtk.Align.CENTER;
        add_step (setup_vbox, _("Setup"), WizardPage.SETUP);
        setup_vbox.show_all ();

        /* Review */
        vbox = new Gtk.VBox (false, 30);
        vbox.valign = Gtk.Align.CENTER;
        vbox.halign = Gtk.Align.CENTER;
        add_step (vbox, _("Review"), WizardPage.REVIEW);

        review_label = new Gtk.Label (null);
        review_label.get_style_context ().add_class ("boxes-wizard-label");
        review_label.xalign = 0.0f;
        review_label.wrap = true;
        review_label.width_chars = 30;
        vbox.pack_start (review_label, false, false);

        summary = new WizardSummary ();
        vbox.pack_start (summary.widget, true, true);
        vbox.show_all ();

        /* topbar */
        hbox = app.topbar.notebook.get_nth_page (Boxes.TopbarPage.WIZARD) as Gtk.HBox;

        var toolbar = new Gtk.Toolbar ();
        toolbar.icon_size = Gtk.IconSize.MENU;
        toolbar.get_style_context ().add_class (Gtk.STYLE_CLASS_MENUBAR);
        toolbar.set_show_arrow (false);
        hbox.pack_start (toolbar, true, true, 0);

        label = new Gtk.Label (_("Create a Box"));
        label.name = "TopbarLabel";
        label.halign = Gtk.Align.START;
        label.margin_left = 15;
        var tool_item = new Gtk.ToolItem ();
        tool_item.set_expand (true);
        tool_item.child = label;
        toolbar.insert (tool_item, 0);

        var cancel = new Gtk.Button.from_stock (Gtk.Stock.CANCEL);
        tool_item = new Gtk.ToolItem ();
        tool_item.child = cancel;
        toolbar.insert (tool_item, 1);
        cancel.clicked.connect (() => {
            wizard_source.page = SourcePage.MAIN;
            app.ui_state = UIState.COLLECTION;
        });

        back_button = new Gtk.Button.from_stock (Gtk.Stock.GO_BACK);
        tool_item = new Gtk.ToolItem ();
        tool_item.child = back_button;
        tool_item.margin_left = 20;
        toolbar.insert (tool_item, 2);
        back_button.clicked.connect (() => {
            page = page - 1;
        });

        next_button = new Gtk.Button.with_mnemonic (_("C_ontinue"));
        tool_item = new Gtk.ToolItem ();
        tool_item.child = next_button;
        tool_item.margin_left = 5;
        toolbar.insert (tool_item, 3);
        next_button.get_style_context ().add_class ("boxes-continue");
        next_button.clicked.connect (() => {
            page = page + 1;
        });

        hbox.show_all ();
        notebook.show_all ();
    }

    public void open_with_uri (string uri) {
        app.ui_state = UIState.WIZARD;

        page = WizardPage.SOURCE;
        wizard_source.page = SourcePage.URL;
        wizard_source.uri = uri;
        page = WizardPage.PREPARATION;
    }

    public override void ui_state_changed () {
        switch (ui_state) {
        case UIState.WIZARD:
            page = WizardPage.INTRODUCTION;
            break;
        }
    }

    private class WizardSummary: GLib.Object {
        public Gtk.Widget widget { get { return table; } }
        private Gtk.Table table;
        private uint current_row;

        public WizardSummary () {
            table = new Gtk.Table (1, 2, false);
            table.row_spacing = 10;
            table.column_spacing = 20;

            clear ();
        }

        public void add_property (string name, string? value) {
            if (value == null)
                return;

            var label_name = new Gtk.Label (name);
            label_name.modify_fg (Gtk.StateType.NORMAL, get_color ("grey"));
            label_name.xalign = 1.0f;
            table.attach_defaults (label_name, 0, 1, current_row, current_row + 1);

            var label_value = new Gtk.Label (value);
            label_value.modify_fg (Gtk.StateType.NORMAL, get_color ("white"));
            label_value.xalign = 0.0f;
            table.attach_defaults (label_value, 1, 2, current_row, current_row + 1);

            current_row += 1;
            table.show_all ();
        }

        public void clear () {
            foreach (var child in table.get_children ()) {
                table.remove (child);
            }

            table.resize (1, 2);
            current_row = 0;
        }
    }
}
