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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2014 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "../common/context.h"
#include "../common/object.h"
#include "container.h"

#include "tree.h"


void* ui_strmodel_getvalue(void *elm, int column) {
    return column == 0 ? elm : NULL;
}


UIWIDGET ui_listview_str(UiObject *obj, UiList *list, ui_callback f, void *udata) {
    return ui_listview(obj, list, ui_strmodel_getvalue, f, udata);
}

UIWIDGET ui_listview_var(UiObject *obj, UiListPtr *list, ui_model_getvalue_f getvalue, ui_callback f, void *udata) {
    // create treeview
    GtkWidget *view = gtk_tree_view_new();
    GtkCellRenderer *renderer = gtk_cell_renderer_text_new();
    GtkTreeViewColumn *column = gtk_tree_view_column_new_with_attributes(NULL, renderer, "text", 0, NULL);
    gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);
    
    gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(view), FALSE);
#ifdef UI_GTK3
    gtk_tree_view_set_activate_on_single_click(GTK_TREE_VIEW(view), TRUE);
#else
    
#endif
    
    UiModelInfo *modelinfo = ui_model_info(obj->ctx, UI_STRING, "", -1);
    modelinfo->getvalue = getvalue;
    UiListModel *model = ui_list_model_new(list, modelinfo);
    gtk_tree_view_set_model(GTK_TREE_VIEW(view), GTK_TREE_MODEL(model));
    
    // add TreeView as observer to the UiList to update the TreeView if the
    // data changes
    UiTableView *listview = ucx_mempool_malloc(obj->ctx->mempool, sizeof(UiTableView));
    listview->widget = view;
    listview->list = list;
    listview->modelinfo = modelinfo;
    list->list->observers = ui_add_observer(
            list->list->observers,
            (ui_callback)ui_listview_update,
            listview);
    
    // add callback
    if(f) {
        UiTreeEventData *event = ui_malloc(obj->ctx, sizeof(UiTreeEventData));
        event->obj = obj;
        event->userdata = udata;
        event->activate = f;
        event->selection = NULL;

        g_signal_connect(
                view,
                "row-activated",
                G_CALLBACK(ui_listview_activate_event),
                event);
    }
    
    // add widget to the current container
    GtkWidget *scroll_area = gtk_scrolled_window_new(NULL, NULL);
    gtk_scrolled_window_set_policy(
            GTK_SCROLLED_WINDOW(scroll_area),
            GTK_POLICY_AUTOMATIC,
            GTK_POLICY_AUTOMATIC); // GTK_POLICY_ALWAYS  
    gtk_container_add(GTK_CONTAINER(scroll_area), view);
    
    UiContainer *ct = uic_get_current_container(obj);
    ct->add(ct, scroll_area, TRUE);
    
    // ct->current should point to view, not scroll_area, to make it possible
    // to add a context menu
    ct->current = view;
    
    return scroll_area;
}

UIWIDGET ui_listview(UiObject *obj, UiList *list, ui_model_getvalue_f getvalue, ui_callback f, void *udata) {
    UiListPtr *listptr = ucx_mempool_malloc(obj->ctx->mempool, sizeof(UiListPtr));
    listptr->list = list;
    return ui_listview_var(obj, listptr, getvalue, f, udata);
}

UIWIDGET ui_listview_nv(UiObject *obj, char *varname, ui_model_getvalue_f getvalue, ui_callback f, void *udata) {
    UiVar *var = uic_connect_var(obj->ctx, varname, UI_VAR_LIST);
    if(var) {
        UiListVar *value = var->value;
        return ui_listview_var(obj, value->listptr, getvalue, f, udata);
    } else {
        // TODO: error
    }
    return NULL;
}


UIWIDGET ui_table_var(UiObject *obj, UiListPtr *list, UiModelInfo *modelinfo) {
    // create treeview
    GtkWidget *view = gtk_tree_view_new();
    for(int i=0;i<modelinfo->columns;i++) {
        GtkCellRenderer *renderer = gtk_cell_renderer_text_new();
        GtkTreeViewColumn *column = gtk_tree_view_column_new_with_attributes(
                modelinfo->titles[i],
                renderer,
                "text",
                i,
                NULL);
        gtk_tree_view_column_set_resizable(column, TRUE);
        gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);
    }
    
    //gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(view), FALSE);
#ifdef UI_GTK3
    //gtk_tree_view_set_activate_on_single_click(GTK_TREE_VIEW(view), TRUE);
#else
    
#endif
    
    UiListModel *model = ui_list_model_new(list, modelinfo);
    gtk_tree_view_set_model(GTK_TREE_VIEW(view), GTK_TREE_MODEL(model));
    
    // add TreeView as observer to the UiList to update the TreeView if the
    // data changes
    UiTableView *tableview = ucx_mempool_malloc(obj->ctx->mempool, sizeof(UiTableView));
    tableview->widget = view;
    tableview->list = list;
    tableview->modelinfo = modelinfo;
    list->list->observers = ui_add_observer(
            list->list->observers,
            (ui_callback)ui_listview_update,
            tableview);
    
    // add callback
    UiTreeEventData *event = ui_malloc(obj->ctx, sizeof(UiTreeEventData));
    event->obj = obj;
    event->activate = modelinfo->activate;
    event->selection = modelinfo->selection;
    event->userdata = modelinfo->userdata;
    if(modelinfo->activate) {
        g_signal_connect(
                view,
                "row-activated",
                G_CALLBACK(ui_listview_activate_event),
                event);
    }
    if(modelinfo->selection) {
        GtkTreeSelection *selection = gtk_tree_view_get_selection(
                GTK_TREE_VIEW(view));
        g_signal_connect(
                selection,
                "changed",
                G_CALLBACK(ui_listview_selection_event),
                event);
    }
    // TODO: destroy callback
    
    GtkTreeSelection *selection = gtk_tree_view_get_selection (GTK_TREE_VIEW(view));
    gtk_tree_selection_set_mode(selection, GTK_SELECTION_MULTIPLE);
    
    // add widget to the current container
    GtkWidget *scroll_area = gtk_scrolled_window_new(NULL, NULL);
    gtk_scrolled_window_set_policy(
            GTK_SCROLLED_WINDOW(scroll_area),
            GTK_POLICY_AUTOMATIC,
            GTK_POLICY_AUTOMATIC); // GTK_POLICY_ALWAYS  
    gtk_container_add(GTK_CONTAINER(scroll_area), view);
    
    UiContainer *ct = uic_get_current_container(obj);
    ct->add(ct, scroll_area, TRUE);
    
    // ct->current should point to view, not scroll_area, to make it possible
    // to add a context menu
    ct->current = view;
    
    return scroll_area;
}

UIWIDGET ui_table(UiObject *obj, UiList *list, UiModelInfo *modelinfo) {
    UiListPtr *listptr = ucx_mempool_malloc(obj->ctx->mempool, sizeof(UiListPtr));
    listptr->list = list;
    return ui_table_var(obj, listptr, modelinfo);
}

UIWIDGET ui_table_nv(UiObject *obj, char *varname, UiModelInfo *modelinfo) {
    UiVar *var = uic_connect_var(obj->ctx, varname, UI_VAR_LIST);
    if(var) {
        UiListVar *value = var->value;
        return ui_table_var(obj, value->listptr, modelinfo);
    } else {
        // TODO: error
    }
    return NULL;
}



void ui_listview_update(UiEvent *event, UiTableView *view) {
    UiListModel *model = ui_list_model_new(view->list, view->modelinfo);
    gtk_tree_view_set_model(GTK_TREE_VIEW(view->widget), GTK_TREE_MODEL(model));   
    
    // TODO: free old model
}

void ui_listview_activate_event(
        GtkTreeView *treeview,
        GtkTreePath *path,
        GtkTreeViewColumn *column,
        UiTreeEventData *event)
{
    UiListSelection *selection = ui_listview_selection(
            gtk_tree_view_get_selection(treeview),
            event);
    
    UiEvent e;
    e.obj = event->obj;
    e.window = event->obj->window;
    e.document = event->obj->ctx->document;
    e.eventdata = selection;
    e.intval = selection->count > 0 ? selection->rows[0] : -1;
    event->activate(&e, event->userdata);
    
    if(selection->count > 0) {
        free(selection->rows);
    }
    free(selection);
}

void ui_listview_selection_event(
        GtkTreeSelection *treeselection,
        UiTreeEventData *event)
{
    UiListSelection *selection = ui_listview_selection(treeselection, event);
    
    UiEvent e;
    e.obj = event->obj;
    e.window = event->obj->window;
    e.document = event->obj->ctx->document;
    e.eventdata = selection;
    e.intval = selection->count > 0 ? selection->rows[0] : -1;
    event->selection(&e, event->userdata);
    
    if(selection->count > 0) {
        free(selection->rows);
    }
    free(selection);
}

UiListSelection* ui_listview_selection(
        GtkTreeSelection *selection,
        UiTreeEventData *event)
{
    GList *rows = gtk_tree_selection_get_selected_rows(selection, NULL);
    
    UiListSelection *ls = malloc(sizeof(UiListSelection));
    ls->count = g_list_length(rows);
    ls->rows = calloc(ls->count, sizeof(int));
    GList *r = rows;
    int i = 0;
    while(r) {
        GtkTreePath *path = r->data;
        ls->rows[i] = ui_tree_path_list_index(path);
        r = r->next;
        i++;
    }
    return ls;
}

int ui_tree_path_list_index(GtkTreePath *path) {
    int depth = gtk_tree_path_get_depth(path);
    if(depth == 0) {
        fprintf(stderr, "UiError: treeview selection: depth == 0\n");
        return -1;
    }
    int *indices = gtk_tree_path_get_indices(path);
    return indices[depth - 1];
}