/*
 * File      : rtgui_app.c
 * This file is part of RTGUI in RT-Thread RTOS
 * COPYRIGHT (C) 2012, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rt-thread.org/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2012-01-13     Grissiom     first version(just a prototype of application API)
 * 2012-07-07     Bernard      move the send/recv message to the rtgui_system.c
 */

#include <rtgui/rtgui_system.h>
#include <rtgui/rtgui_app.h>
#include <rtgui/widgets/window.h>

static void _rtgui_app_constructor(struct rtgui_app *app)
{
    /* set event handler */
    rtgui_object_set_event_handler(RTGUI_OBJECT(app),
                                   rtgui_app_event_handler);

    app->name           = RT_NULL;
    app->icon           = RT_NULL;
    /* set EXITED so we can destroy an application that just created */
    app->state_flag     = RTGUI_APP_FLAG_EXITED;
    app->ref_count      = 0;
    app->exit_code      = 0;
    app->tid            = RT_NULL;
    app->server         = RT_NULL;
    app->mq             = RT_NULL;
    app->modal_object   = RT_NULL;
    app->main_object    = RT_NULL;
    app->on_idle        = RT_NULL;
}

static void _rtgui_app_destructor(struct rtgui_app *app)
{
    RT_ASSERT(app != RT_NULL);

    rt_free(app->name);
    app->name = RT_NULL;
}

DEFINE_CLASS_TYPE(application, "application",
                  RTGUI_OBJECT_TYPE,
                  _rtgui_app_constructor,
                  _rtgui_app_destructor,
                  sizeof(struct rtgui_app));

struct rtgui_app *rtgui_app_create(
    rt_thread_t tid,
    const char *title)
{
    rt_thread_t srv_tid;
    struct rtgui_app *app;
    struct rtgui_event_application event;

    RT_ASSERT(tid != RT_NULL);
    RT_ASSERT(title != RT_NULL);

    /* create application */
    app = RTGUI_APP(rtgui_object_create(RTGUI_APP_TYPE));
    if (app == RT_NULL)
        return RT_NULL;

    /* one thread only can create one rtgui application */
    RT_ASSERT(tid->user_data == 0);
    app->tid = tid;
    /* set user thread */
    tid->user_data = (rt_uint32_t)app;

    app->mq = rt_mq_create("rtgui", sizeof(union rtgui_event_generic), 32, RT_IPC_FLAG_FIFO);
    if (app->mq == RT_NULL)
    {
        rt_kprintf("create msgq failed.\n");
        goto __mq_err;
    }

    /* set application title */
    app->name = (unsigned char *)rt_strdup((char *)title);
    if (app->name == RT_NULL)
        goto __err;

    /* send a message to notify rtgui server */
    srv_tid = rtgui_get_server();
    if (srv_tid == RT_NULL)
    {
        rt_kprintf("gui server is not running.\n");
        goto __err;
    }

    /* create the rtgui server application */
    if (srv_tid == rt_thread_self())
        return app;

    RTGUI_EVENT_APP_CREATE_INIT(&event);
    event.app = app;

    /* notify rtgui server to one application has been created */
    if (rtgui_send_sync(srv_tid, RTGUI_EVENT(&event), sizeof(event)) == RT_EOK)
    {
        return app;
    }

__err:
__mq_err:
    rtgui_object_destroy(RTGUI_OBJECT(app));
    tid->user_data = 0;
    return RT_NULL;
}
RTM_EXPORT(rtgui_app_create);

#define _rtgui_application_check(app)           \
    do {                                        \
        RT_ASSERT(app != RT_NULL);              \
        RT_ASSERT(app->tid != RT_NULL);         \
        RT_ASSERT(app->tid->user_data != 0);    \
        RT_ASSERT(app->mq != RT_NULL);          \
    } while (0)

void rtgui_app_destroy(struct rtgui_app *app)
{
    rt_thread_t srv_tid;
    _rtgui_application_check(app);

    if (!(app->state_flag & RTGUI_APP_FLAG_EXITED))
    {
        rt_kprintf("cannot destroy a running application: %s.\n",
                   app->name);
        return;
    }

    /* send a message to notify rtgui server */
    srv_tid = rtgui_get_server();
    if (srv_tid != rt_thread_self()) /* must not the server thread */
    {
        struct rtgui_event_application event;
        RTGUI_EVENT_APP_DESTROY_INIT(&event);
        event.app = app;

        if (rtgui_send_sync(srv_tid, RTGUI_EVENT(&event), sizeof(event)) != RT_EOK)
        {
            rt_kprintf("destroy an application in server failed\n");
            return ;
        }
    }

    app->tid->user_data = 0;
    rt_mq_delete(app->mq);
    rtgui_object_destroy(RTGUI_OBJECT(app));
}
RTM_EXPORT(rtgui_app_destroy);

struct rtgui_app *rtgui_app_self(void)
{
    struct rtgui_app *app;
    rt_thread_t self;

    /* get current thread */
    self = rt_thread_self();
    app = (struct rtgui_app *)(self->user_data);

    return app;
}
RTM_EXPORT(rtgui_app_self);

void rtgui_app_set_onidle(rtgui_idle_func_t onidle)
{
    struct rtgui_app *app;

    app = rtgui_app_self();
    if (app != RT_NULL)
        app->on_idle = onidle;
}
RTM_EXPORT(rtgui_app_set_onidle);

rtgui_idle_func_t rtgui_app_get_onidle(void)
{
    struct rtgui_app *app;

    app = rtgui_app_self();
    if (app != RT_NULL)
        return app->on_idle;
    else
        return RT_NULL;
}
RTM_EXPORT(rtgui_app_get_onidle);

rt_inline rt_bool_t _rtgui_application_dest_handle(
    struct rtgui_app *app,
    struct rtgui_event *event)
{
    struct rtgui_event_win *wevent = (struct rtgui_event_win *)event;

    struct rtgui_object *dest_object = RTGUI_OBJECT(wevent->wid);

    if (dest_object != RT_NULL)
    {
        if (dest_object->event_handler != RT_NULL)
            return dest_object->event_handler(RTGUI_OBJECT(dest_object), event);
        else
            return RT_FALSE;
    }
    else
    {
        rt_kprintf("RTGUI ERROR:server sent a event(%d) without wid\n", event->type);
        return RT_FALSE;
    }
}

rt_bool_t rtgui_app_event_handler(struct rtgui_object *object, rtgui_event_t *event)
{
    struct rtgui_app *app;

    RT_ASSERT(object != RT_NULL);
    RT_ASSERT(event != RT_NULL);

    app = RTGUI_APP(object);

    switch (event->type)
    {
    case RTGUI_EVENT_PAINT:
    case RTGUI_EVENT_CLIP_INFO:
    case RTGUI_EVENT_WIN_ACTIVATE:
    case RTGUI_EVENT_WIN_DEACTIVATE:
    case RTGUI_EVENT_WIN_CLOSE:
    case RTGUI_EVENT_WIN_MOVE:
    case RTGUI_EVENT_KBD:
        _rtgui_application_dest_handle(app, event);
        break;

    case RTGUI_EVENT_APP_ACTIVATE:
        if (app->main_object != RT_NULL)
        {
            rtgui_win_activate(RTGUI_WIN(app->main_object));
            if (app->modal_object != RT_NULL)
                rtgui_win_activate(RTGUI_WIN(app->modal_object));
        }
        else if (app->modal_object != RT_NULL)
        {
            rtgui_win_activate(RTGUI_WIN(app->modal_object));
        }
        break;

    case RTGUI_EVENT_APP_DESTROY:
        rtgui_app_exit(app, 0);
        break;

    case RTGUI_EVENT_MOUSE_BUTTON:
    case RTGUI_EVENT_MOUSE_MOTION:
    {
        struct rtgui_event_win *wevent = (struct rtgui_event_win *)event;
        struct rtgui_object *dest_object = RTGUI_OBJECT(wevent->wid);

        // FIXME: let application determine the dest_wiget but not in sever
        // so we can combine this handler with above one
        if (app->modal_object != RT_NULL &&
                dest_object != app->modal_object)
        {
//              rt_kprintf("discard event %s that is not sent to modal object\n",
//                         event_string[event->type]);
        }
        else
        {
            _rtgui_application_dest_handle(app, event);
        }
    }
    break;

    case RTGUI_EVENT_TIMER:
    {
        struct rtgui_timer *timer;
        struct rtgui_event_timer *etimer = (struct rtgui_event_timer *) event;

        timer = etimer->timer;
        if (timer->timeout != RT_NULL)
        {
            /* call timeout function */
            timer->timeout(timer, timer->user_data);
        }
    }
    break;

    case RTGUI_EVENT_MV_MODEL:
    {
        struct rtgui_event_mv_model *emodel = (struct rtgui_event_mv_model *)event;
        RT_ASSERT(emodel->view);
        return rtgui_object_handle(RTGUI_OBJECT(emodel->view), event);
    }

    case RTGUI_EVENT_COMMAND:
    {
        struct rtgui_event_command *ecmd = (struct rtgui_event_command *)event;

        if (ecmd->wid != RT_NULL)
            return _rtgui_application_dest_handle(app, event);
    }
    default:
    return rtgui_object_event_handler(object, event);
    }

    return RT_TRUE;
}

rt_inline void _rtgui_application_event_loop(struct rtgui_app *app)
{
    rt_err_t result;
    rt_uint16_t current_ref;
    struct rtgui_event *event;

    _rtgui_application_check(app);

    /* point to event buffer */
    event = (struct rtgui_event *)app->event_buffer;

    current_ref = ++app->ref_count;

    while (current_ref <= app->ref_count)
    {
        RT_ASSERT(current_ref == app->ref_count);

        if (app->on_idle != RT_NULL)
        {
            result = rtgui_recv_nosuspend(event, sizeof(union rtgui_event_generic));
            if (result == RT_EOK)
                RTGUI_OBJECT(app)->event_handler(RTGUI_OBJECT(app), event);
            else if (result == -RT_ETIMEOUT)
                app->on_idle(RTGUI_OBJECT(app), RT_NULL);
        }
        else
        {
            result = rtgui_recv(event, sizeof(union rtgui_event_generic));
            if (result == RT_EOK)
                RTGUI_OBJECT(app)->event_handler(RTGUI_OBJECT(app), event);
        }
    }
}

rt_base_t rtgui_app_run(struct rtgui_app *app)
{
    _rtgui_application_check(app);

    app->state_flag &= ~RTGUI_APP_FLAG_EXITED;

    _rtgui_application_event_loop(app);

    if (app->ref_count == 0)
        app->state_flag |= RTGUI_APP_FLAG_EXITED;

    return app->exit_code;
}
RTM_EXPORT(rtgui_app_run);

void rtgui_app_exit(struct rtgui_app *app, rt_uint16_t code)
{
    --app->ref_count;
    app->exit_code = code;
}
RTM_EXPORT(rtgui_app_exit);

void rtgui_app_activate(struct rtgui_app *app)
{
    struct rtgui_event_application event;

    RTGUI_EVENT_APP_ACTIVATE_INIT(&event);
    event.app = app;

    rtgui_send(app->tid, RTGUI_EVENT(&event), sizeof(struct rtgui_event_application));
}
RTM_EXPORT(rtgui_app_activate);

void rtgui_app_close(struct rtgui_app *app)
{
    struct rtgui_event_application event;

    RTGUI_EVENT_APP_DESTROY_INIT(&event);
    event.app = app;

    rtgui_send(app->tid, RTGUI_EVENT(&event), sizeof(struct rtgui_event_application));
}
RTM_EXPORT(rtgui_app_close);

/**
 * set this application as window manager
 */
rt_err_t rtgui_app_set_as_wm(void)
{
    rt_thread_t srv_tid;
    struct rtgui_event_set_wm event;
    struct rtgui_app *app;

    srv_tid = rtgui_get_server();
    app = rtgui_app_self();
    if (app != RT_NULL && srv_tid != RT_NULL)
    {
        /* notify rtgui server, this is a window manager */
        RTGUI_EVENT_SET_WM_INIT(&event);
        event.app = app;

        rtgui_send_sync(srv_tid, RTGUI_EVENT(&event), sizeof(event));
        return RT_EOK;
    }

    return RT_ERROR;
}
RTM_EXPORT(rtgui_app_set_as_wm);

void rtgui_app_set_main_win(struct rtgui_win *win)
{
    struct rtgui_app *app;

    app = rtgui_app_self();
    if (app != RT_NULL)
    {
        app->main_object = RTGUI_OBJECT(win);
    }
}
RTM_EXPORT(rtgui_app_set_main_win);