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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 <string.h>
#include <stdbool.h>

#include "toolkit.h"
#include "toolbar.h"
#include "image.h"
#include "../common/document.h"
#include "../common/properties.h"
#include "../common/menu.h"
#include "../common/toolbar.h"
#include "../common/threadpool.h"

#include <cx/utils.h>
#include <cx/string.h>
#include <cx/printf.h>

#include <pthread.h>

#ifdef UI_APPLICATION
UI_APPLICATION app;
#endif

static const char *application_name;

static ui_callback   startup_func;
static void          *startup_data;
static ui_callback   open_func;
void                 *open_data;
static ui_callback   exit_func;
void                 *exit_data;

static ui_callback   appclose_fnc;
static void          *appclose_udata;

static UiObject      *active_window;

static int scale_factor = 1;

UIEXPORT void ui_init(const char *appname, int argc, char **argv) {
    application_name = appname;
    uic_init_global_context();
    
#if GTK_MAJOR_VERSION >= 4
    gtk_init();
#else
    gtk_init(&argc, &argv);
#endif
    
    ui_css_init();
    uic_docmgr_init();
    uic_toolbar_init();
    ui_image_init();
    uic_load_app_properties();
    
#if GTK_MAJOR_VERSION >= 4
    scale_factor = 1; // TODO
#elif defined(UI_SUPPORTS_SCALE)
    scale_factor = gdk_monitor_get_scale_factor(
            gdk_display_get_primary_monitor(gdk_display_get_default()));
#endif
}

const char* ui_appname() {
    return application_name;
}

void ui_onstartup(ui_callback f, void *userdata) {
    startup_func = f;
    startup_data = userdata;
}

void ui_onopen(ui_callback f, void *userdata) {
    open_func = f;
    open_data = userdata;
}

void ui_onexit(ui_callback f, void *userdata) {
    exit_func = f;
    exit_data = userdata;
}


#ifndef UI_GTK2
static void app_startup(GtkApplication* app, gpointer userdata) {
    if(startup_func) {
        startup_func(NULL, startup_data);
    }
}

static void app_activate(GtkApplication* app, gpointer userdata) {
    printf("activate\n");
}
#endif

void ui_main() {
#ifdef UI_APPLICATION
    cxmutstr appid = cx_asprintf(
            "ui.%s",
            application_name ? application_name : "application1");
    app = UI_APPLICATION_NEW(appid.ptr);
    g_signal_connect (app, "startup", G_CALLBACK (app_startup), NULL);
    g_signal_connect (app, "activate", G_CALLBACK (app_activate), NULL);
    g_application_run(G_APPLICATION (app), 0, NULL);
    g_object_unref (app);
    
    free(appid.ptr);
#else
    if(startup_func) {
        startup_func(NULL, startup_data);
    }
    gtk_main();
#endif
    if(exit_func) {
        exit_func(NULL, exit_data);
    }
    uic_store_app_properties();
}

#ifndef UI_GTK2
void ui_app_quit() {
    g_application_quit(G_APPLICATION(app));
}

GtkApplication* ui_get_application() {
    return GTK_APPLICATION(app);
}
#endif

void ui_show(UiObject *obj) {
    uic_check_group_widgets(obj->ctx);
#if GTK_MAJOR_VERSION >= 4
    gtk_window_present(GTK_WINDOW(obj->widget));
#elif GTK_MAJOR_VERSION <= 3
    gtk_widget_show_all(obj->widget);
#endif
}

void ui_close(UiObject *obj) {
    // TODO
    //gtk_widget_destroy(obj->widget);
}


static gboolean ui_job_finished(void *data) {
    UiJob *job = data;
    
    UiEvent event;
    event.obj = job->obj;
    event.window = job->obj->window;
    event.document = job->obj->ctx->document;
    event.intval = 0;
    event.eventdata = NULL;

    job->finish_callback(&event, job->finish_data);
    free(job);
    return FALSE;
}

static void* ui_jobthread(void *data) {
    UiJob *job = data;
    int result = job->job_func(job->job_data);
    if(!result && job->finish_callback) {
        g_idle_add(ui_job_finished, job);
    } else {
        free(job);
    }
    return NULL;
}

static gboolean ui_idle_func(void *data) {
    UiJob *job = data;
    job->job_func(job->job_data);
    free(job);
    return FALSE;
}

void ui_call_mainthread(ui_threadfunc tf, void* td) {
    UiJob *job = malloc(sizeof(UiJob));
    job->job_func = tf;
    job->job_data = td;
    job->finish_callback = NULL;
    job->finish_data = NULL;
    job->obj = NULL;
    g_idle_add(ui_idle_func, job);
}

void ui_job(UiObject *obj, ui_threadfunc tf, void *td, ui_callback f, void *fd) {
    UiJob *job = malloc(sizeof(UiJob));
    job->obj = obj;
    job->job_func = tf;
    job->job_data = td;
    job->finish_callback = f;
    job->finish_data = fd;
    pthread_t pid;
    pthread_create(&pid, NULL, ui_jobthread, job);
}

void ui_set_enabled(UIWIDGET widget, int enabled) {
    gtk_widget_set_sensitive(widget, enabled);
}

void ui_set_show_all(UIWIDGET widget, int value) {
    // TODO: gtk4
#if GTK_MAJOR_VERSION <= 3
    gtk_widget_set_no_show_all(widget, !value);
#endif
}

void ui_set_visible(UIWIDGET widget, int visible) {
    // TODO: gtk4
#if GTK_MAJOR_VERSION <= 3
    if(visible) {
        gtk_widget_set_no_show_all(widget, FALSE);
        gtk_widget_show_all(widget);
    } else {
        gtk_widget_hide(widget);
    }
#endif
}

void ui_clipboard_set(char *str) {
#if GTK_MAJOR_VERSION >= 4
    // TODO: gtk4: needs widget
#else
    GtkClipboard *cb = gtk_clipboard_get(GDK_SELECTION_CLIPBOARD);
    gtk_clipboard_set_text(cb, str, strlen(str));
#endif
}

char* ui_clipboard_get() {
#if GTK_MAJOR_VERSION >= 4
    // TODO: gtk4: needs widget
    return NULL;
#else
    GtkClipboard *cb = gtk_clipboard_get(GDK_SELECTION_CLIPBOARD);
    char *str = gtk_clipboard_wait_for_text(cb);
    if(str) {
        char *copy = strdup(str);
        g_free(str);
        return copy;
    } else {
        return NULL;
    }
#endif
}

int ui_get_scalefactor() {
    return scale_factor;
}

void ui_destroy_userdata(GtkWidget *object, void *userdata) {
    free(userdata);
}

void ui_destroy_vardata(GtkWidget *object, UiVarEventData *data) {
    if(data->var) {
        ui_destroy_boundvar(data->obj->ctx, data->var);
    }
    free(data);
}

void ui_destroy_boundvar(UiContext *ctx, UiVar *var) {
    uic_unbind_var(var);
    
    if(var->type == UI_VAR_SPECIAL) {
        free(var);
    } else {
        ui_free(var->from_ctx, var);
        // TODO: free or unbound
        //uic_remove_bound_var(ctx, var);
    }
}

void ui_set_active_window(UiObject *obj) {
    active_window = obj;
}

UiObject *ui_get_active_window() {
    return active_window;
}


#if GTK_MAJOR_VERSION >= 3

static GtkCssProvider* ui_gtk_css_provider;

#if GTK_MAJOR_VERSION == 4
static const char *ui_gtk_css = 
"#path-textfield-box {\n"
"  background-color: alpha(currentColor, 0.1);"
"  border-radius: 6px;"
"  padding: 0px;"
"}\n"
".pathbar-extra-button {\n"
"  border-top-right-radius: 6px;"
"  border-bottom-right-radius: 6px;"
"  border-top-left-radius: 0px;"
"  border-bottom-left-radius: 0px;"
"}\n"
"#pathbar button {\n"
"  margin: 3px;"
"  border-radius: 4px;"
"  padding-top: 0px;"
"  padding-bottom: 0px;"
"  padding-left: 8px;"
"  padding-right: 8px;"
"}\n"
"#path-textfield-box entry {\n"
"  background-color: #00000000;"
"  border-top-left-radius: 6px;"
"  border-bottom-left-radius: 6px;"
"  border-top-right-radius: 0px;"
"  border-bottom-right-radius: 0px;"
"}"
;

#elif GTK_MAJOR_VERSION == 3
static const char *ui_gtk_css = 
"#path-textfield-box {"
"  background-color: @theme_base_color;"
"  border-radius: 5px;"
"  padding: 0px;"
"}";
#endif

void ui_css_init(void) {
    ui_gtk_css_provider = gtk_css_provider_new();
    
#ifdef UI_GTK3
    gtk_css_provider_load_from_data(ui_gtk_css_provider, ui_gtk_css, -1, NULL);
    
    GdkScreen *screen = gdk_screen_get_default();
    gtk_style_context_add_provider_for_screen(
            screen,
            GTK_STYLE_PROVIDER(ui_gtk_css_provider),
            GTK_STYLE_PROVIDER_PRIORITY_USER);
#endif /* UI_GTK3 */
    
#ifdef UI_GTK4
    
    
#if GTK_MINOR_VERSION < 12
    gtk_css_provider_load_from_data(ui_gtk_css_provider, ui_gtk_css, -1);
#else
    gtk_css_provider_load_from_string(ui_gtk_css_provider, ui_gtk_css);
#endif /* GTK_MINOR_VERSION < 12 */
    
    GdkDisplay *display = gdk_display_get_default();
    gtk_style_context_add_provider_for_display(display, GTK_STYLE_PROVIDER(ui_gtk_css_provider), GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
    
#endif /* UI_GTK4 */
}



#endif

void ui_set_name_and_style(GtkWidget *widget, const char *name, const char *style_classes) {
    if(name) {
        gtk_widget_set_name(widget, name);
    }
    if(style_classes) {
        cxstring *cls = NULL;
        size_t numClasses = cx_strsplit_a(cxDefaultAllocator, cx_str(style_classes), CX_STR(" "), 128, &cls);
        for(int i=0;i<numClasses;i++) {
            cxmutstr m = cx_strdup(cls[i]);
#if GTK_MAJOR_VERSION >= 4
            gtk_widget_add_css_class(widget, m.ptr);
#elif GTK_MAJOR_VERSION >= 3
            GtkStyleContext *ctx = gtk_widget_get_style_context(widget);
            gtk_style_context_add_class(ctx, m.ptr);
#endif
            free(m.ptr);
        }
        free(cls);
        
    }
}