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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2017 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 <limits.h>

#include "container.h"
#include "toolkit.h"

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


void ui_container_begin_close(UiObject *obj) {
    UiContainer *ct = uic_get_current_container(obj);
    ct->close = 1;
}

int ui_container_finish(UiObject *obj) {
    UiContainer *ct = uic_get_current_container(obj);
    if(ct->close) {
        ui_end(obj);
        return 0;
    }
    return 1;
}

GtkWidget* ui_gtk_vbox_new(int spacing) {
#if GTK_MAJOR_VERSION >= 3
    return gtk_box_new(GTK_ORIENTATION_VERTICAL, spacing);
#else
    return gtk_vbox_new(FALSE, spacing);
#endif
}

GtkWidget* ui_gtk_hbox_new(int spacing) {
#if GTK_MAJOR_VERSION >= 3
    return gtk_box_new(GTK_ORIENTATION_HORIZONTAL, spacing);
#else
    return gtk_hbox_new(FALSE, spacing);
#endif
}



/* -------------------- Box Container -------------------- */
UiContainer* ui_box_container(UiObject *obj, GtkWidget *box, UiSubContainerType type) {
    UiBoxContainer *ct = cxCalloc(
            obj->ctx->allocator,
            1,
            sizeof(UiBoxContainer));
    ct->container.widget = box;
    ct->container.add = ui_box_container_add;
    ct->type = type;
    return (UiContainer*)ct;
}

void ui_box_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill) {
    UiBoxContainer *bc = (UiBoxContainer*)ct;
    if(ct->layout.fill != UI_LAYOUT_UNDEFINED) {
        fill = ui_lb2bool(ct->layout.fill);
    }
    
    if(bc->has_fill && fill) {
        fprintf(stderr, "UiError: container has 2 filled widgets");
        fill = FALSE;
    }
    if(fill) {
        bc->has_fill = TRUE;
    }
    
    UiBool expand = fill;
#if GTK_MAJOR_VERSION >= 4
    gtk_box_append(GTK_BOX(ct->widget), widget);
    GtkAlign align = expand ? GTK_ALIGN_FILL : GTK_ALIGN_START; 
    if(bc->type == UI_CONTAINER_VBOX) {
        gtk_widget_set_valign(widget, align);
        gtk_widget_set_vexpand(widget, expand);
        gtk_widget_set_hexpand(widget, TRUE);
    } else if(bc->type == UI_CONTAINER_HBOX) {
        gtk_widget_set_halign(widget, align);
        gtk_widget_set_hexpand(widget, expand);
        gtk_widget_set_vexpand(widget, TRUE);
    }
    
#else
    gtk_box_pack_start(GTK_BOX(ct->widget), widget, expand, fill, 0);
#endif
    
    ui_reset_layout(ct->layout);
    ct->current = widget;
}

UiContainer* ui_grid_container(UiObject *obj, GtkWidget *grid) {
    UiGridContainer *ct = cxCalloc(
            obj->ctx->allocator,
            1,
            sizeof(UiGridContainer));
    ct->container.widget = grid;
    ct->container.add = ui_grid_container_add;
#ifdef UI_GTK2
    ct->width = 0;
    ct->height = 1;
#endif
    return (UiContainer*)ct;
}

#if GTK_MAJOR_VERSION >= 3
void ui_grid_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill) {
    UiGridContainer *grid = (UiGridContainer*)ct;
    
    if(ct->layout.newline) {
        grid->x = 0;
        grid->y++;
        ct->layout.newline = FALSE;
    }
    
    int hexpand = FALSE;
    int vexpand = FALSE;
    if(ct->layout.hexpand != UI_LAYOUT_UNDEFINED) {
        hexpand = ct->layout.hexpand;
    }
    if(ct->layout.vexpand != UI_LAYOUT_UNDEFINED) {
        vexpand = ct->layout.vexpand;
    }
    
    if(hexpand) {
        gtk_widget_set_hexpand(widget, TRUE);
    }
    if(vexpand) {
        gtk_widget_set_vexpand(widget, TRUE);
    }
    
    int colspan = ct->layout.colspan > 0 ? ct->layout.colspan : 1;
    int rowspan = ct->layout.rowspan > 0 ? ct->layout.rowspan : 1;
    
    gtk_grid_attach(GTK_GRID(ct->widget), widget, grid->x, grid->y, colspan, rowspan);
    grid->x += colspan;
    
    ui_reset_layout(ct->layout);
    ct->current = widget;
}
#endif
#ifdef UI_GTK2
void ui_grid_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill) {
    UiGridContainer *grid = (UiGridContainer*)ct;
    
    if(ct->layout.newline) {
        grid->x = 0;
        grid->y++;
        ct->layout.newline = FALSE;
    }
    
    int hexpand = FALSE;
    int vexpand = FALSE;
    if(ct->layout.hexpand != UI_LAYOUT_UNDEFINED) {
        hexpand = ct->layout.hexpand;
    }
    if(ct->layout.vexpand != UI_LAYOUT_UNDEFINED) {
        vexpand = ct->layout.vexpand;
    }
    GtkAttachOptions xoptions = hexpand ? GTK_FILL | GTK_EXPAND : GTK_FILL;
    GtkAttachOptions yoptions = vexpand ? GTK_FILL | GTK_EXPAND : GTK_FILL;
    
    int colspan = ct->layout.colspan > 0 ? ct->layout.colspan : 1;
    int rowspan = ct->layout.rowspan > 0 ? ct->layout.rowspan : 1;
    // TODO: use colspan/rowspan
    
    gtk_table_attach(GTK_TABLE(ct->widget), widget, grid->x, grid->x+1, grid->y, grid->y+1, xoptions, yoptions, 0, 0);
    grid->x++;
    int nw = grid->x > grid->width ? grid->x : grid->width;
    if(grid->x > grid->width || grid->y > grid->height) {
        grid->width = nw;
        grid->height = grid->y + 1;
        gtk_table_resize(GTK_TABLE(ct->widget), grid->width, grid->height);
    }
    
    ui_reset_layout(ct->layout);
    ct->current = widget;
}
#endif

UiContainer* ui_scrolledwindow_container(UiObject *obj, GtkWidget *scrolledwindow) {
    UiContainer *ct = cxCalloc(
            obj->ctx->allocator,
            1,
            sizeof(UiContainer));
    ct->widget = scrolledwindow;
    ct->add = ui_scrolledwindow_container_add;
    return ct;
}

void ui_scrolledwindow_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill) {
    // TODO: check if the widget implements GtkScrollable
#ifdef UI_GTK4
    gtk_scrolled_window_set_child(GTK_SCROLLED_WINDOW(ct->widget), widget);
#elif defined(UI_GTK3)
    gtk_container_add(GTK_CONTAINER(ct->widget), widget);
#else
    gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(ct->widget), widget);
#endif
    ui_reset_layout(ct->layout);
    ct->current = widget;
}

UiContainer* ui_tabview_container(UiObject *obj, GtkWidget *tabview) {
    UiTabViewContainer *ct = cxCalloc(
            obj->ctx->allocator,
            1,
            sizeof(UiTabViewContainer));
    ct->container.widget = tabview;
    ct->container.add = ui_tabview_container_add;
    return (UiContainer*)ct;
}

void ui_tabview_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill) {
    gtk_notebook_append_page(
            GTK_NOTEBOOK(ct->widget),
            widget,
            gtk_label_new(ct->layout.label));
    
    ui_reset_layout(ct->layout);
    ct->current = widget;
}



static GtkWidget* box_set_margin(GtkWidget *box, int margin) {
    GtkWidget *ret = box;
#ifdef UI_GTK3
#if GTK_MAJOR_VERSION == 3 && GTK_MINOR_VERSION >= 12
    gtk_widget_set_margin_start(box, margin);
    gtk_widget_set_margin_end(box, margin);
#else
    gtk_widget_set_margin_left(box, margin);
    gtk_widget_set_margin_right(box, margin);
#endif
    gtk_widget_set_margin_top(box, margin);
    gtk_widget_set_margin_bottom(box, margin);
#elif defined(UI_GTK2)
    GtkWidget *a = gtk_alignment_new(0.5, 0.5, 1, 1);
    gtk_alignment_set_padding(GTK_ALIGNMENT(a), margin, margin, margin, margin);
    gtk_container_add(GTK_CONTAINER(a), box);
    ret = a;
#endif
    return ret;
}

UIWIDGET ui_box_create(UiObject *obj, UiContainerArgs args, UiSubContainerType type) {
    UiObject *current = uic_current_obj(obj);
    UiContainer *ct = current->container;
    UI_APPLY_LAYOUT1(current, args);
    
    GtkWidget *box = type == UI_CONTAINER_VBOX ? ui_gtk_vbox_new(args.spacing) : ui_gtk_hbox_new(args.spacing);
    GtkWidget *widget = args.margin > 0 ? box_set_margin(box, args.margin) : box;
    ct->add(ct, widget, TRUE);
    
    UiObject *newobj = uic_object_new(obj, box);
    newobj->container = ui_box_container(obj, box, type);
    uic_obj_add(obj, newobj);
    
    return widget;
}

UIEXPORT UIWIDGET ui_vbox_create(UiObject *obj, UiContainerArgs args) {
    return ui_box_create(obj, args, UI_CONTAINER_VBOX);
}

UIEXPORT UIWIDGET ui_hbox_create(UiObject *obj, UiContainerArgs args) {
    return ui_box_create(obj, args, UI_CONTAINER_HBOX);
}



UIWIDGET ui_grid_create(UiObject *obj, UiContainerArgs args) {
    UiObject* current = uic_current_obj(obj);
    UI_APPLY_LAYOUT1(current, args);
    GtkWidget *widget;
    
#if GTK_MAJOR_VERSION >= 3
    GtkWidget *grid = gtk_grid_new();
    gtk_grid_set_column_spacing(GTK_GRID(grid), args.columnspacing);
    gtk_grid_set_row_spacing(GTK_GRID(grid), args.rowspacing);
#if GTK_MAJOR_VERSION >= 3 && GTK_MINOR_VERSION >= 12
    gtk_widget_set_margin_start(grid, args.margin);
    gtk_widget_set_margin_end(grid, args.margin);
#else
    gtk_widget_set_margin_left(grid, args.margin);
    gtk_widget_set_margin_right(grid, args.margin);
#endif
    gtk_widget_set_margin_top(grid, args.margin);
    gtk_widget_set_margin_bottom(grid, args.margin);
    
    widget = grid;
#elif defined(UI_GTK2)
    GtkWidget *grid = gtk_table_new(1, 1, FALSE);
    
    gtk_table_set_col_spacings(GTK_TABLE(grid), columnspacing);
    gtk_table_set_row_spacings(GTK_TABLE(grid), rowspacing);
    
    if(margin > 0) {
        GtkWidget *a = gtk_alignment_new(0.5, 0.5, 1, 1);
        gtk_alignment_set_padding(GTK_ALIGNMENT(a), margin, margin, margin, margin);
        gtk_container_add(GTK_CONTAINER(a), grid);
        widget = a;
    } else {
        widget = grid;
    }
#endif
    current->container->add(current->container, widget, TRUE);
    
    UiObject *newobj = uic_object_new(obj, grid);
    newobj->container = ui_grid_container(obj, grid);
    uic_obj_add(obj, newobj);
    
    return widget;
}


UIWIDGET ui_scrolledwindow_create(UiObject* obj, UiFrameArgs args) {
    UiObject* current = uic_current_obj(obj);
    UI_APPLY_LAYOUT1(current, args);
    
    GtkWidget *sw = SCROLLEDWINDOW_NEW();
    UiObject *newobj = uic_object_new(obj, sw);
    newobj->container = ui_scrolledwindow_container(obj, sw);
    uic_obj_add(obj, newobj);
    
    return sw;
}


void ui_select_tab(UIWIDGET tabview, int tab) {
    gtk_notebook_set_current_page(GTK_NOTEBOOK(tabview), tab);
}

/* -------------------- Splitpane -------------------- */

static GtkWidget* create_paned(UiOrientation orientation) {
#if GTK_MAJOR_VERSION >= 3
    switch(orientation) {
        case UI_HORIZONTAL: return gtk_paned_new(GTK_ORIENTATION_HORIZONTAL);
        case UI_VERTICAL: return gtk_paned_new(GTK_ORIENTATION_VERTICAL);
    }
#else
    switch(orientation) {
        case UI_HORIZONTAL: return gtk_hpaned_new();
        case UI_VERTICAL: return gtk_vpaned_new();
    }
#endif
    return NULL;
}






/*
 * -------------------- Layout Functions --------------------
 * 
 * functions for setting layout attributes for the current container
 *
 */

void ui_layout_fill(UiObject *obj, UiBool fill) {
    UiContainer *ct = uic_get_current_container(obj);
    ct->layout.fill = ui_bool2lb(fill);
}

void ui_layout_hexpand(UiObject *obj, UiBool expand) {
    UiContainer *ct = uic_get_current_container(obj);
    ct->layout.hexpand = expand;
}

void ui_layout_vexpand(UiObject *obj, UiBool expand) {
    UiContainer *ct = uic_get_current_container(obj);
    ct->layout.vexpand = expand;
}

void ui_layout_colspan(UiObject* obj, int cols) {
    UiContainer* ct = uic_get_current_container(obj);
    ct->layout.colspan = cols;
}

void ui_layout_rowspan(UiObject* obj, int rows) {
    UiContainer* ct = uic_get_current_container(obj);
    ct->layout.rowspan = rows;
}

void ui_newline(UiObject *obj) {
    UiContainer *ct = uic_get_current_container(obj);
    ct->layout.newline = TRUE;
}