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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) {
#ifdef UI_GTK3
    return gtk_box_new(GTK_ORIENTATION_VERTICAL, spacing);
#else
    return gtk_vbox_new(FALSE, spacing);
#endif
}

GtkWidget* ui_gtk_hbox_new(int spacing) {
#ifdef UI_GTK3
    return gtk_box_new(GTK_ORIENTATION_HORIZONTAL, spacing);
#else
    return gtk_hbox_new(FALSE, spacing);
#endif
}

/* -------------------- Frame Container (deprecated) -------------------- */
UiContainer* ui_frame_container(UiObject *obj, GtkWidget *frame) {
    UiContainer *ct = cxCalloc(
            obj->ctx->allocator,
            1,
            sizeof(UiContainer));
    ct->widget = frame;
    ct->add = ui_frame_container_add;
    return ct;
}

void ui_frame_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill) {
    gtk_container_add(GTK_CONTAINER(ct->widget), widget);
    ui_reset_layout(ct->layout);
    ct->current = widget;
}


/* -------------------- Box Container -------------------- */
UiContainer* ui_box_container(UiObject *obj, GtkWidget *box) {
    UiBoxContainer *ct = cxCalloc(
            obj->ctx->allocator,
            1,
            sizeof(UiBoxContainer));
    ct->container.widget = box;
    ct->container.add = ui_box_container_add;
    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;
    gtk_box_pack_start(GTK_BOX(ct->widget), widget, expand, fill, 0);
    
    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;
}

#ifdef UI_GTK3
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 gwidth = ct->layout.gridwidth > 0 ? ct->layout.gridwidth : 1;
    
    gtk_grid_attach(GTK_GRID(ct->widget), widget, grid->x, grid->y, gwidth, 1);
    grid->x += gwidth;
    
    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;
    
    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_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;
}


UIWIDGET ui_vbox(UiObject *obj) {
    return ui_vbox_sp(obj, 0, 0);
}

UIWIDGET ui_hbox(UiObject *obj) {
    return ui_hbox_sp(obj, 0, 0);
}

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_vbox_sp(UiObject *obj, int margin, int spacing) {
    UiContainer *ct = uic_get_current_container(obj);
    
    GtkWidget *vbox = ui_gtk_vbox_new(spacing);   
    GtkWidget *widget = margin > 0 ? box_set_margin(vbox, margin) : vbox;
    ct->add(ct, widget, TRUE);
    
    UiObject *newobj = uic_object_new(obj, vbox);
    newobj->container = ui_box_container(obj, vbox);
    uic_obj_add(obj, newobj);
    
    return widget;
}

UIWIDGET ui_hbox_sp(UiObject *obj, int margin, int spacing) {
    UiContainer *ct = uic_get_current_container(obj);
    
    GtkWidget *hbox = ui_gtk_hbox_new(spacing);
    GtkWidget *widget = margin > 0 ? box_set_margin(hbox, margin) : hbox;
    ct->add(ct, widget, TRUE);
    
    UiObject *newobj = uic_object_new(obj, hbox);
    newobj->container = ui_box_container(obj, hbox);
    uic_obj_add(obj, newobj);
    
    return widget;
}

UIWIDGET ui_grid(UiObject *obj) {
    return ui_grid_sp(obj, 0, 0, 0);
}

UIWIDGET ui_grid_sp(UiObject *obj, int margin, int columnspacing, int rowspacing) {
    UiContainer *ct = uic_get_current_container(obj);
    GtkWidget *widget;
    
#ifdef UI_GTK3
    GtkWidget *grid = gtk_grid_new();
    gtk_grid_set_column_spacing(GTK_GRID(grid), columnspacing);
    gtk_grid_set_row_spacing(GTK_GRID(grid), rowspacing);
#if GTK_MAJOR_VERSION == 3 && GTK_MINOR_VERSION >= 12
    gtk_widget_set_margin_start(grid, margin);
    gtk_widget_set_margin_end(grid, margin);
#else
    gtk_widget_set_margin_left(grid, margin);
    gtk_widget_set_margin_right(grid, margin);
#endif
    gtk_widget_set_margin_top(grid, margin);
    gtk_widget_set_margin_bottom(grid, 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
    ct->add(ct, 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(UiObject *obj) {
    UiContainer *ct = uic_get_current_container(obj);
    GtkWidget *sw = gtk_scrolled_window_new(NULL, NULL);
    ct->add(ct, sw, TRUE);
    
    UiObject *newobj = uic_object_new(obj, sw);
    newobj->container = ui_scrolledwindow_container(obj, sw);
    uic_obj_add(obj, newobj);
    
    return sw;
}

UIWIDGET ui_tabview(UiObject *obj) {
    GtkWidget *tabview = gtk_notebook_new();
    gtk_notebook_set_show_border(GTK_NOTEBOOK(tabview), FALSE);
    gtk_notebook_set_show_tabs(GTK_NOTEBOOK(tabview), FALSE);
    
    UiContainer *ct = uic_get_current_container(obj);
    ct->add(ct, tabview, TRUE);
    
    UiObject *tabviewobj = uic_object_new(obj, tabview);
    tabviewobj->container = ui_tabview_container(obj, tabview);
    uic_obj_add(obj, tabviewobj);
    
    return tabview;
}

void ui_tab(UiObject *obj, char *title) {
    UiContainer *ct = uic_get_current_container(obj);
    ct->layout.label = title;
    ui_vbox(obj);
}

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

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

static GtkWidget* create_paned(UiOrientation orientation) {
#ifdef UI_GTK3
    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;
}

UIWIDGET ui_splitpane(UiObject *obj, int max, UiOrientation orientation) {
    GtkWidget *paned = create_paned(orientation);
    UiContainer *ct = uic_get_current_container(obj);
    ct->add(ct, paned, TRUE);
    
    if(max <= 0) max = INT_MAX;
    
    UiPanedContainer *pctn = cxCalloc(
            obj->ctx->allocator,
            1,
            sizeof(UiPanedContainer));
    pctn->container.widget = paned;
    pctn->container.add = ui_paned_container_add;
    pctn->current_pane = paned;
    pctn->orientation = orientation;
    pctn->max = max;
    pctn->cur = 0;
    
    UiObject *pobj = uic_object_new(obj, paned);
    pobj->container = (UiContainer*)pctn;
    
    uic_obj_add(obj, pobj);
    
    return paned;
}

UIWIDGET ui_hsplitpane(UiObject *obj, int max) {
    return ui_splitpane(obj, max, UI_HORIZONTAL);
}

UIWIDGET ui_vsplitpane(UiObject *obj, int max) {
    return ui_splitpane(obj, max, UI_VERTICAL);
}

void ui_paned_container_add(UiContainer *ct, GtkWidget *widget, UiBool fill) {
    UiPanedContainer *pctn = (UiPanedContainer*)ct;
    
    gboolean resize = (ct->layout.hexpand || ct->layout.vexpand) ? TRUE : FALSE;
    int width = ct->layout.width;
    ui_reset_layout(ct->layout);
    
    if(pctn->cur == 0) {
        gtk_paned_pack1(GTK_PANED(pctn->current_pane), widget, resize, resize);
    } else if(pctn->cur < pctn->max-1) {
        GtkWidget *nextPane = create_paned(pctn->orientation);
        gtk_paned_pack2(GTK_PANED(pctn->current_pane), nextPane, TRUE, TRUE);
        gtk_paned_pack1(GTK_PANED(nextPane), widget, resize, resize);
        pctn->current_pane = nextPane;
    } else if(pctn->cur == pctn->max-1) {
        gtk_paned_pack2(GTK_PANED(pctn->current_pane), widget, resize, resize);
        width = 0; // disable potential call of gtk_paned_set_position
    } else {
        fprintf(stderr, "Splitpane max reached: %d\n", pctn->max);
        return;
    }
    
    if(width > 0) {
        gtk_paned_set_position(GTK_PANED(pctn->current_pane), width);
    }
    
    pctn->cur++;
}


/* -------------------- Sidebar (deprecated) -------------------- */
UIWIDGET ui_sidebar(UiObject *obj) {
#ifdef UI_GTK3
    GtkWidget *paned = gtk_paned_new(GTK_ORIENTATION_HORIZONTAL);
#else
    GtkWidget *paned = gtk_hpaned_new();
#endif
    gtk_paned_set_position(GTK_PANED(paned), 200);
    
    GtkWidget *sidebar = ui_gtk_vbox_new(0);
    gtk_paned_pack1(GTK_PANED(paned), sidebar, TRUE, FALSE);
    
    UiObject *left = uic_object_new(obj, sidebar);
    UiContainer *ct1 = ui_box_container(obj, sidebar);
    left->container = ct1;
    
    UiObject *right = uic_object_new(obj, sidebar);
    UiContainer *ct2 = cxCalloc(
            obj->ctx->allocator,
            1,
            sizeof(UiContainer));
    ct2->widget = paned;
    ct2->add = ui_split_container_add2;
    right->container = ct2;
    
    UiContainer *ct = uic_get_current_container(obj);
    ct->add(ct, paned, TRUE);
    
    uic_obj_add(obj, right);
    uic_obj_add(obj, left);
    
    return sidebar;
}

void ui_split_container_add1(UiContainer *ct, GtkWidget *widget, UiBool fill) {
    // TODO: remove
    gtk_paned_pack1(GTK_PANED(ct->widget), widget, TRUE, FALSE);
    
    ui_reset_layout(ct->layout);
    ct->current = widget;
}

void ui_split_container_add2(UiContainer *ct, GtkWidget *widget, UiBool fill) {
    gtk_paned_pack2(GTK_PANED(ct->widget), widget, TRUE, FALSE);
    
    ui_reset_layout(ct->layout);
    ct->current = widget;
}


/* -------------------- Document Tabview -------------------- */
static void page_change(GtkNotebook *notebook, GtkWidget *page, guint page_num, gpointer data) {
    GQuark q = g_quark_from_static_string("ui.tab.object");
    UiObject *tab = g_object_get_qdata(G_OBJECT(page), q);
    if(!tab) {
        return;
    }
    
    //printf("page_change: %d\n", page_num);
    UiContext *ctx = tab->ctx;
    uic_context_detach_all(ctx->parent); // TODO: fix?
    ctx->parent->attach_document(ctx->parent, ctx->document);
}

UiTabbedPane* ui_tabbed_document_view(UiObject *obj) {
    GtkWidget *tabview = gtk_notebook_new();
    gtk_notebook_set_show_border(GTK_NOTEBOOK(tabview), FALSE);
    
    g_signal_connect(
                tabview,
                "switch-page",
                G_CALLBACK(page_change),
                NULL);
    
    UiContainer *ct = uic_get_current_container(obj);
    ct->add(ct, tabview, TRUE);
    
    UiTabbedPane *tabbedpane = ui_malloc(obj->ctx, sizeof(UiTabbedPane));
    tabbedpane->ctx = uic_current_obj(obj)->ctx;
    tabbedpane->widget = tabview;
    tabbedpane->document = NULL;
    
    return tabbedpane;
}

UiObject* ui_document_tab(UiTabbedPane *view) {
    GtkWidget *frame = gtk_frame_new(NULL);
    gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_NONE);
    // TODO: label
    gtk_notebook_append_page(GTK_NOTEBOOK(view->widget), frame, NULL);
    
    UiObject *tab = ui_malloc(view->ctx, sizeof(UiObject));
    tab->widget = NULL; // initialization for uic_context()
    tab->ctx = uic_context(tab, view->ctx->allocator);
    tab->ctx->parent = view->ctx;
    tab->ctx->attach_document = uic_context_attach_document;
    tab->ctx->detach_document2 = uic_context_detach_document2;
    tab->widget = frame;
    tab->window = view->ctx->obj->window;
    tab->container = ui_frame_container(tab, frame);
    tab->next = NULL;
    
    GQuark q = g_quark_from_static_string("ui.tab.object");
    g_object_set_qdata(G_OBJECT(frame), q, tab);
    
    return tab;
}

void ui_tab_set_document(UiContext *ctx, void *document) {
    // TODO: remove?
    if(ctx->parent->document) {
        //ctx->parent->detach_document(ctx->parent, ctx->parent->document);
    }
    //uic_context_set_document(ctx, document);
    //uic_context_set_document(ctx->parent, document);
    //ctx->parent->document = document;
}

void ui_tab_detach_document(UiContext *ctx) {
    // TODO: remove?
    //uic_context_detach_document(ctx->parent);
}


/*
 * -------------------- 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_width(UiObject *obj, int width) {
    UiContainer *ct = uic_get_current_container(obj);
    ct->layout.width = width;
}

void ui_layout_gridwidth(UiObject *obj, int width) {
    UiContainer *ct = uic_get_current_container(obj);
    ct->layout.gridwidth = width;
}

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