/*
 *  Copyright (C) 2015 Savoir-Faire Linux Inc.
 *  Author: Stepan Salenikovich <stepan.salenikovich@savoirfairelinux.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.
 *
 *  Additional permission under GNU GPL version 3 section 7:
 *
 *  If you modify this program, or any covered work, by linking or
 *  combining it with the OpenSSL project's OpenSSL library (or a
 *  modified version of that library), containing parts covered by the
 *  terms of the OpenSSL or SSLeay licenses, Savoir-Faire Linux Inc.
 *  grants you additional permission to convey the resulting work.
 *  Corresponding Source for a non-source form of such a combination
 *  shall include the source code for the parts of OpenSSL used as well
 *  as that of the covered work.
 */

#include "historyview.h"

#include <gtk/gtk.h>
#include "models/gtkqsortfiltertreemodel.h"
#include <categorizedhistorymodel.h>
#include <QtCore/QSortFilterProxyModel>
#include <personmodel.h>
#include "utils/calling.h"
#include <memory>
#include "delegates/pixbufdelegate.h"
#include "defines.h"
#include "utils/models.h"
#include <contactmethod.h>
#include <QtCore/QDateTime> // for date time formatting
#include <QtCore/QItemSelectionModel>
#include "utils/menus.h"

struct _HistoryView
{
    GtkBox parent;
};

struct _HistoryViewClass
{
    GtkBoxClass parent_class;
};

typedef struct _HistoryViewPrivate HistoryViewPrivate;

struct _HistoryViewPrivate
{
    CategorizedHistoryModel::SortedProxy *q_sorted_proxy;
    QMetaObject::Connection category_changed;
};

G_DEFINE_TYPE_WITH_PRIVATE(HistoryView, history_view, GTK_TYPE_BOX);

#define HISTORY_VIEW_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), HISTORY_VIEW_TYPE, HistoryViewPrivate))

static void
render_call_direction(G_GNUC_UNUSED GtkTreeViewColumn *tree_column,
                      GtkCellRenderer *cell,
                      GtkTreeModel *tree_model,
                      GtkTreeIter *iter,
                      G_GNUC_UNUSED gpointer data)
{
    /* check if this is a top level item (the fuzzy date item),
     * in this case we don't want to show a call direction */
    gchar *render_direction = NULL;
    GtkTreeIter parent;
    if (gtk_tree_model_iter_parent(tree_model, &parent, iter)) {
        /* get direction and missed values */
        GValue value = G_VALUE_INIT;
        gtk_tree_model_get_value(tree_model, iter, 3, &value);
        Call::Direction direction = (Call::Direction)g_value_get_int(&value);
        g_value_unset(&value);

        gtk_tree_model_get_value(tree_model, iter, 4, &value);
        gboolean missed = g_value_get_boolean(&value);
        g_value_unset(&value);

        switch (direction) {
            case Call::Direction::INCOMING:
                if (missed)
                    render_direction = g_strdup_printf("<span fgcolor=\"red\" font=\"monospace\">&#8601;</span>");
                else
                    render_direction = g_strdup_printf("<span fgcolor=\"green\" font=\"monospace\">&#8601;</span>");
            break;
            case Call::Direction::OUTGOING:
                if (missed)
                    render_direction = g_strdup_printf("<span fgcolor=\"red\" font=\"monospace\">&#8599;</span>");
                else
                    render_direction = g_strdup_printf("<span fgcolor=\"green\" font=\"monospace\">&#8599;</span>");
            break;
        }
    }
    g_object_set(G_OBJECT(cell), "markup", render_direction, NULL);
    g_free(render_direction);
}

static void
activate_history_item(GtkTreeView *tree_view,
                      GtkTreePath *path,
                      G_GNUC_UNUSED GtkTreeViewColumn *column,
                      G_GNUC_UNUSED gpointer user_data)
{
    GtkTreeModel *model = gtk_tree_view_get_model(tree_view);

    /* expand / collapse row */
    if (gtk_tree_view_row_expanded(tree_view, path))
        gtk_tree_view_collapse_row(tree_view, path);
    else
        gtk_tree_view_expand_row(tree_view, path, FALSE);

    /* get iter */
    GtkTreeIter iter;
    if (gtk_tree_model_get_iter(model, &iter, path)) {
        QModelIndex idx = gtk_q_sort_filter_tree_model_get_source_idx(GTK_Q_SORT_FILTER_TREE_MODEL(model), &iter);

        QVariant contact_method = idx.data(static_cast<int>(Call::Role::ContactMethod));
        /* create new call */
        if (contact_method.value<ContactMethod*>()) {
            place_new_call(contact_method.value<ContactMethod*>());
        }
    }
}

static void
copy_history_item(G_GNUC_UNUSED GtkWidget *item, GtkTreeView *treeview)
{
    GtkTreeSelection *selection = gtk_tree_view_get_selection(treeview);
    QModelIndex idx = get_index_from_selection(selection);

    if (idx.isValid()) {
        GtkClipboard* clip = gtk_clipboard_get(GDK_SELECTION_CLIPBOARD);

        const gchar* number = idx.data(static_cast<int>(Call::Role::Number)).toString().toUtf8().constData();
        gtk_clipboard_set_text(clip, number, -1);
    }
}

/* TODO: can't seem to delete just one item for now, add when supported in backend
 * static void
 * delete_history_item(G_GNUC_UNUSED GtkWidget *item, GtkTreeView *treeview)
 * {
 *     GtkTreeSelection *selection = gtk_tree_view_get_selection(treeview);
 *     QModelIndex idx = get_index_from_selection(selection);
 *
 *     if (idx.isValid()) {
 *         g_debug("deleting history item");
 *         CategorizedHistoryModel::instance()->removeRow(idx.row(), idx.parent());
 *     }
 * }
 */

static gboolean
history_popup_menu(G_GNUC_UNUSED GtkWidget *widget, GdkEventButton *event, GtkTreeView *treeview)
{
    /* build popup menu when right clicking on history item
     * user should be able to copy the "number",
     * delete history item or all of the history,
     * and eventualy add the number to a contact
     */

    /* check for right click */
    if (event->button != BUTTON_RIGHT_CLICK || event->type != GDK_BUTTON_PRESS)
        return FALSE;

    GtkWidget *menu = gtk_menu_new();

    /* copy */
    GtkWidget *item = gtk_menu_item_new_with_mnemonic("_Copy");
    gtk_menu_shell_append(GTK_MENU_SHELL(menu), item);
    g_signal_connect(item, "activate", G_CALLBACK(copy_history_item), treeview);

    /* TODO: delete history entry
     * gtk_menu_shell_append(GTK_MENU_SHELL(menu), gtk_separator_menu_item_new());
     * item = gtk_menu_item_new_with_mnemonic("_Delete entry");
     * gtk_menu_shell_append(GTK_MENU_SHELL(menu), item);
     * g_signal_connect(item, "activate", G_CALLBACK(delete_history_item), treeview);
     */

    /* check if the selected item is a call, if so get the contact method and
     * check if it is already linked to a person, if not, then offer to either
     * add to a new or existing contact */
    auto selection = gtk_tree_view_get_selection(treeview);
    const auto& idx = get_index_from_selection(selection);
    const auto& var_c = idx.data(static_cast<int>(Call::Role::Object));
    if (idx.isValid() && var_c.isValid()) {
        if (auto call = var_c.value<Call *>()) {
            auto contactmethod = call->peerContactMethod();
            if (!contact_method_has_contact(contactmethod)) {
                GtkTreeIter iter;
                GtkTreeModel *model;
                gtk_tree_selection_get_selected(selection, &model, &iter);
                auto path = gtk_tree_model_get_path(model, &iter);
                auto column = gtk_tree_view_get_column(treeview, 0);
                GdkRectangle rect;
                gtk_tree_view_get_cell_area(treeview, path, column, &rect);
                gtk_tree_view_convert_bin_window_to_widget_coords(treeview, rect.x, rect.y, &rect.x, &rect.y);
                gtk_tree_path_free(path);
                auto add_to = menu_item_add_to_contact(contactmethod, GTK_WIDGET(treeview), &rect);
                gtk_menu_shell_append(GTK_MENU_SHELL(menu), add_to);
            }
        }
    }

    /* show menu */
    gtk_widget_show_all(menu);
    gtk_menu_popup(GTK_MENU(menu), NULL, NULL, NULL, NULL, event->button, event->time);

    return TRUE;
}

static void
render_call_photo(G_GNUC_UNUSED GtkTreeViewColumn *tree_column,
                     GtkCellRenderer *cell,
                     GtkTreeModel *tree_model,
                     GtkTreeIter *iter,
                     G_GNUC_UNUSED gpointer data)
{
    /* check if this is a top level item (category),
     * in this case we don't want to show a photo */
    GtkTreePath *path = gtk_tree_model_get_path(tree_model, iter);
    int depth = gtk_tree_path_get_depth(path);
    gtk_tree_path_free(path);
    if (depth == 2) {
        /* get person */
        QModelIndex idx = gtk_q_sort_filter_tree_model_get_source_idx(GTK_Q_SORT_FILTER_TREE_MODEL(tree_model), iter);
        if (idx.isValid()) {
            QVariant var_c = idx.data(static_cast<int>(Call::Role::Object));
            Call *c = var_c.value<Call *>();
            /* get photo */
            QVariant var_p = PixbufDelegate::instance()->callPhoto(c, QSize(50, 50), false);
            std::shared_ptr<GdkPixbuf> photo = var_p.value<std::shared_ptr<GdkPixbuf>>();
            g_object_set(G_OBJECT(cell), "pixbuf", photo.get(), NULL);
            return;
        }
    }

    /* otherwise, make sure its an empty pixbuf */
    g_object_set(G_OBJECT(cell), "pixbuf", NULL, NULL);
}

static void
render_name_and_contact_method(G_GNUC_UNUSED GtkTreeViewColumn *tree_column,
                               GtkCellRenderer *cell,
                               GtkTreeModel *tree_model,
                               GtkTreeIter *iter,
                               G_GNUC_UNUSED gpointer data)
{
    /**
     * If call, show the name and the contact method (number) underneath;
     * otherwise just display the category.
     */
    GtkTreePath *path = gtk_tree_model_get_path(tree_model, iter);
    int depth = gtk_tree_path_get_depth(path);
    gtk_tree_path_free(path);

    gchar *text = NULL;

    QModelIndex idx = gtk_q_sort_filter_tree_model_get_source_idx(GTK_Q_SORT_FILTER_TREE_MODEL(tree_model), iter);
    if (idx.isValid()) {
        QVariant var = idx.data(Qt::DisplayRole);
        if (depth == 1) {
            /* category */
            text = g_strdup_printf("<b>%s</b>", var.value<QString>().toUtf8().constData());
        } else if (depth == 2) {
            /* call item */
            QVariant var_name = idx.data(static_cast<int>(Call::Role::Name));
            QVariant var_number = idx.data(static_cast<int>(Call::Role::Number));
            text = g_strdup_printf("%s\n <span fgcolor=\"gray\">%s</span>",
                                   var_name.value<QString>().toUtf8().constData(),
                                   var_number.value<QString>().toUtf8().constData());
        }
    }

    g_object_set(G_OBJECT(cell), "markup", text, NULL);
    g_free(text);
}

static void
render_time(G_GNUC_UNUSED GtkTreeViewColumn *tree_column,
            GtkCellRenderer *cell,
            GtkTreeModel *tree_model,
            GtkTreeIter *iter,
            G_GNUC_UNUSED gpointer data)
{
    /**
     * If call, show the the time;
     * if category, don't show anything.
     */
    GtkTreePath *path = gtk_tree_model_get_path(tree_model, iter);
    int depth = gtk_tree_path_get_depth(path);
    gtk_tree_path_free(path);

    gchar *text = NULL;

    QModelIndex idx = gtk_q_sort_filter_tree_model_get_source_idx(GTK_Q_SORT_FILTER_TREE_MODEL(tree_model), iter);
    if (idx.isValid() && depth == 2) {
        QVariant var_d = idx.data(static_cast<int>(Call::Role::Date));
        time_t time = var_d.value<time_t>();
        QDateTime date_time = QDateTime::fromTime_t(time);
        text = g_strdup_printf("%s", date_time.time().toString().toUtf8().constData());
    }

    g_object_set(G_OBJECT(cell), "markup", text, NULL);
    g_free(text);
}

static void
render_date(G_GNUC_UNUSED GtkTreeViewColumn *tree_column,
            GtkCellRenderer *cell,
            GtkTreeModel *tree_model,
            GtkTreeIter *iter,
            G_GNUC_UNUSED gpointer data)
{
    /**
     * If call, show the date;
     * if category, don't show anything.
     */
    GtkTreePath *path = gtk_tree_model_get_path(tree_model, iter);
    int depth = gtk_tree_path_get_depth(path);
    gtk_tree_path_free(path);

    gchar *text = NULL;

    QModelIndex idx = gtk_q_sort_filter_tree_model_get_source_idx(GTK_Q_SORT_FILTER_TREE_MODEL(tree_model), iter);
    if (idx.isValid() && depth == 2) {
        QVariant var_d = idx.data(static_cast<int>(Call::Role::Date));
        time_t time = var_d.value<time_t>();
        QDateTime date_time = QDateTime::fromTime_t(time);
        text = g_strdup_printf("%s", date_time.date().toString().toUtf8().constData());
    }

    g_object_set(G_OBJECT(cell), "markup", text, NULL);
    g_free(text);
}

static void
history_view_init(HistoryView *self)
{
    HistoryViewPrivate *priv = HISTORY_VIEW_GET_PRIVATE(self);

    gtk_orientable_set_orientation(GTK_ORIENTABLE(self), GTK_ORIENTATION_VERTICAL);
    /* need to be able to focus on widget so that we can auto-scroll to it */
    gtk_widget_set_can_focus(GTK_WIDGET(self), TRUE);

    GtkWidget *label_history = gtk_label_new("History");
    gtk_box_pack_start(GTK_BOX(self), label_history, FALSE, TRUE, 10);

    GtkWidget *treeview_history = gtk_tree_view_new();
    /* set can-focus to false so that the scrollwindow doesn't jump to try to
     * contain the top of the treeview */
    gtk_widget_set_can_focus(treeview_history, FALSE);
    /* make headers visible to allow column resizing */
    gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(treeview_history), TRUE);
    gtk_box_pack_start(GTK_BOX(self), treeview_history, TRUE, TRUE, 0);

    /* disable default search, we will handle it ourselves via LRC;
     * otherwise the search steals input focus on key presses */
    gtk_tree_view_set_enable_search(GTK_TREE_VIEW(treeview_history), FALSE);

    /* instantiate history proxy model */
    priv->q_sorted_proxy = CategorizedHistoryModel::SortedProxy::instance();

    /* for now there is no way in the UI to pick whether sorting is ascending
     * or descending, so we do it in the code when the category changes */
    priv->category_changed = QObject::connect(
        priv->q_sorted_proxy->categorySelectionModel(),
        &QItemSelectionModel::currentChanged,
        [=] (const QModelIndex &current, G_GNUC_UNUSED const QModelIndex &previous)
        {
            if (current.isValid()) {
                if (current.row() == 0) {
                    /* sort in descending order for the date */
                    priv->q_sorted_proxy->model()->sort(0, Qt::DescendingOrder);
                } else {
                    /* ascending order for verything else */
                    priv->q_sorted_proxy->model()->sort(0);
                }
            }
        }
    );

    /* select default category (the first one, which is by date) */
    priv->q_sorted_proxy->categorySelectionModel()->setCurrentIndex(
        priv->q_sorted_proxy->categoryModel()->index(0, 0),
        QItemSelectionModel::ClearAndSelect);

    GtkQSortFilterTreeModel *history_model = gtk_q_sort_filter_tree_model_new(
        priv->q_sorted_proxy->model(),
        5,
        Qt::DisplayRole, G_TYPE_STRING,
        Call::Role::Number, G_TYPE_STRING,
        Call::Role::FormattedDate, G_TYPE_STRING,
        Call::Role::Direction, G_TYPE_INT,
        Call::Role::Missed, G_TYPE_BOOLEAN);
    gtk_tree_view_set_model( GTK_TREE_VIEW(treeview_history), GTK_TREE_MODEL(history_model) );

    /* call direction, photo, name/number column */
    GtkCellArea *area = gtk_cell_area_box_new();
    GtkTreeViewColumn *column = gtk_tree_view_column_new_with_area(area);
    gtk_tree_view_column_set_title(column, "Call");

    /* call direction */
    GtkCellRenderer *renderer = gtk_cell_renderer_text_new();
    gtk_cell_area_box_pack_start(GTK_CELL_AREA_BOX(area), renderer, FALSE, FALSE, FALSE);

    /* display the call direction with arrows */
    gtk_tree_view_column_set_cell_data_func(
        column,
        renderer,
        (GtkTreeCellDataFunc)render_call_direction,
        NULL,
        NULL);

    /* photo renderer */
    renderer = gtk_cell_renderer_pixbuf_new();
    gtk_cell_area_box_pack_start(GTK_CELL_AREA_BOX(area), renderer, FALSE, FALSE, FALSE);

    /* get the photo */
    gtk_tree_view_column_set_cell_data_func(
        column,
        renderer,
        (GtkTreeCellDataFunc)render_call_photo,
        NULL,
        NULL);

    /* name and contact method renderer */
    renderer = gtk_cell_renderer_text_new();
    g_object_set(G_OBJECT(renderer), "ellipsize", PANGO_ELLIPSIZE_END, NULL);
    gtk_cell_area_box_pack_start(GTK_CELL_AREA_BOX(area), renderer, FALSE, FALSE, FALSE);

    gtk_tree_view_column_set_cell_data_func(
        column,
        renderer,
        (GtkTreeCellDataFunc)render_name_and_contact_method,
        NULL,
        NULL);

    gtk_tree_view_append_column(GTK_TREE_VIEW(treeview_history), column);
    gtk_tree_view_column_set_resizable(column, TRUE);
    gtk_tree_view_column_set_expand(column, TRUE);

    /* date column */
    area = gtk_cell_area_box_new();
    column = gtk_tree_view_column_new_with_area(area);
    gtk_tree_view_column_set_title(column, "Date");

    /* time renderer */
    renderer = gtk_cell_renderer_text_new ();
    gtk_cell_area_box_pack_start(GTK_CELL_AREA_BOX(area), renderer, FALSE, FALSE, FALSE);
    /* format the time*/
    gtk_tree_view_column_set_cell_data_func(
        column,
        renderer,
        (GtkTreeCellDataFunc)render_time,
        NULL,
        NULL);

    /* date renderer */
    renderer = gtk_cell_renderer_text_new ();
    gtk_cell_area_box_pack_start(GTK_CELL_AREA_BOX(area), renderer, FALSE, FALSE, FALSE);
    g_object_set(G_OBJECT(renderer), "ellipsize", PANGO_ELLIPSIZE_END, NULL);
    /* format the date */
    gtk_tree_view_column_set_cell_data_func(
        column,
        renderer,
        (GtkTreeCellDataFunc)render_date,
        NULL,
        NULL);

    gtk_tree_view_append_column(GTK_TREE_VIEW(treeview_history), column);
    gtk_tree_view_column_set_resizable(column, TRUE);
    gtk_tree_view_column_set_expand(column, FALSE);

    g_signal_connect(treeview_history, "row-activated", G_CALLBACK(activate_history_item), NULL);
    g_signal_connect(treeview_history, "button-press-event", G_CALLBACK(history_popup_menu), treeview_history);

    gtk_widget_show_all(GTK_WIDGET(self));
}

static void
history_view_dispose(GObject *object)
{
    HistoryViewPrivate *priv = HISTORY_VIEW_GET_PRIVATE(object);

    QObject::disconnect(priv->category_changed);

    G_OBJECT_CLASS(history_view_parent_class)->dispose(object);
}

static void
history_view_finalize(GObject *object)
{
    G_OBJECT_CLASS(history_view_parent_class)->finalize(object);
}

static void
history_view_class_init(HistoryViewClass *klass)
{
    G_OBJECT_CLASS(klass)->finalize = history_view_finalize;
    G_OBJECT_CLASS(klass)->dispose = history_view_dispose;
}

GtkWidget *
history_view_new()
{
    gpointer self = g_object_new(HISTORY_VIEW_TYPE, NULL);

    return (GtkWidget *)self;
}