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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 <unistd.h>
#include <pthread.h>

#include "toolkit.h"
#include "toolbar.h"
#include "stock.h"
#include "../common/document.h"
#include "../common/properties.h"
#include <ucx/buffer.h>

static XtAppContext app;
static Display *display;
static Widget active_window;
static 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 int is_toplevel_realized = 0;

int event_pipe[2];


static String fallback[] = {
    	//"*fontList: -dt-interface system-medium-r-normal-s*utf*:",    
        "*text_area*renderTable: f1",
        "*f1*fontType: FONT_IS_XFT",
        "*f1*fontName: Monospace",
        "*f1*fontSize: 11",
        "*renderTable: rt",
        "*rt*fontType: FONT_IS_XFT",
        "*rt*fontName: Sans",
        "*rt*fontSize: 11",
	NULL
};

void input_proc(XtPointer data, int *source, XtInputId *iid) {
    void *ptr;
    read(event_pipe[0], &ptr, sizeof(void*));
}

void ui_init(char *appname, int argc, char **argv) { 
    application_name = appname;
    
    XtToolkitInitialize();
    XtSetLanguageProc(NULL, NULL, NULL);
    app = XtCreateApplicationContext();
    XtAppSetFallbackResources(app, fallback);
    
    display =  XtOpenDisplay(app, NULL, appname, appname, NULL, 0, &argc, argv);
    char **missing = NULL;
    int nm = 0;
    char *def = NULL;
    XCreateFontSet(display, "-dt-interface system-medium-r-normal-s*utf*", &missing, &nm, &def);
    
    uic_docmgr_init();
    ui_toolbar_init();
    ui_stock_init();
    
    uic_load_app_properties();
    
    if(pipe(event_pipe)) {
        fprintf(stderr, "UiError: Cannot create event pipe\n");
        exit(-1);
    }
    XtAppAddInput(
            app,
            event_pipe[0],
            (XtPointer)XtInputReadMask,
            input_proc,
            NULL);
}

char* ui_appname() {
    return application_name;
}

Display* ui_get_display() {
    return display;
}

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;
}

void ui_main() {
    if(startup_func) {
        startup_func(NULL, startup_data);
    }
    XtAppMainLoop(app);
    if(exit_func) {
        exit_func(NULL, exit_data);
    }
    uic_store_app_properties();
}

void ui_exit_mainloop() {
    XtAppSetExitFlag(app);
}

void ui_secondary_event_loop(int *loop) {
    while(*loop && !XtAppGetExitFlag(app)) {
        XEvent event;
        XtAppNextEvent(app, &event);
        XtDispatchEvent(&event);
    }
}

void ui_show(UiObject *obj) {
    uic_check_group_widgets(obj->ctx);
    XtRealizeWidget(obj->widget);
    ui_window_dark_theme(XtDisplay(obj->widget), XtWindow(obj->widget)); // TODO: if
}

// implemented in window.c
//void ui_close(UiObject *obj)

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

void ui_set_show_all(UIWIDGET widget, int value) {
    if(!value) {
        XtUnmanageChild(widget);
    }
}

void ui_set_visible(UIWIDGET widget, int visible) {
    if(visible) {
        XtManageChild(widget);
    } else {
        XtUnmanageChild(widget);
    }
}

static Boolean ui_job_finished(void *data) {
    printf("WorkProc\n");
    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 TRUE;
}

static void* ui_jobthread(void *data) {
    UiJob *job = data;
    int result = job->job_func(job->job_data);
    if(!result) {
        printf("XtAppAddWorkProc\n");
        write(event_pipe[1], &job, sizeof(void*)); // hack
        XtAppAddWorkProc(app, ui_job_finished, 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_clipboard_set(char *str) {
    printf("copy: {%s}\n", str);
    int length = strlen(str) + 1;
    
    Display *dp = XtDisplayOfObject(active_window);
    Window window = XtWindowOfObject(active_window);
    
    XmString label = XmStringCreateLocalized("toolkit_clipboard");
    long id = 0;
    
    while(XmClipboardStartCopy(
            dp,
            window,
            label,
            CurrentTime,
            NULL,
            NULL,
            &id) == ClipboardLocked);
    XmStringFree(label);
    
    while(XmClipboardCopy(
            dp,
            window,
            id,
            "STRING",
            str, 
            length,
            1,
            NULL) == ClipboardLocked);
    
    while(XmClipboardEndCopy(dp, window, id) == ClipboardLocked);
}

char* ui_clipboard_get() {
    Display *dp = XtDisplayOfObject(active_window);
    Window window = XtWindowOfObject(active_window);
    
    long id;
    size_t size = 128;
    char *buf = malloc(size);
    
    int r;
    for(;;) {
        r = XmClipboardRetrieve(dp, window, "STRING", buf, size, NULL, &id);
        if(r == ClipboardSuccess) {
            break;
        } else if(r == ClipboardTruncate) {
            size *= 2;
            buf = realloc(buf, size);
        } else if(r == ClipboardNoData) {
            free(buf);
            buf = NULL;
            break;
        }
    }
    
    return buf;
}

void ui_set_active_window(Widget w) {
    active_window = w;
}

Widget ui_get_active_window() {
    return active_window;
}

void ui_window_dark_theme(Display *dp, Window window) {
    Atom atom = XInternAtom(dp, "_GTK_THEME_VARIANT", False);
    Atom type = XInternAtom(dp, "UTF8_STRING", False);
    XChangeProperty(
            dp, 
            window, 
            atom,
            type,
            8,
            PropModeReplace,
            (const unsigned char*)"dark",
            4);
}