/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/

/*
  Contributed by Brandon Schaefer, <brandon.schaefer@canonical.com>
*/

#include "../../SDL_internal.h"

#if SDL_VIDEO_DRIVER_MIR

#include "../SDL_egl_c.h"
#include "../SDL_sysvideo.h"

#include "SDL_mirevents.h"
#include "SDL_mirwindow.h"

#include "SDL_mirdyn.h"

int
IsSurfaceValid(MIR_Window* mir_window)
{
    if (!MIR_mir_surface_is_valid(mir_window->surface)) {
        const char* error = MIR_mir_surface_get_error_message(mir_window->surface);
        return SDL_SetError("Failed to created a mir surface: %s", error);
    }

    return 0;
}

int
MIR_CreateWindow(_THIS, SDL_Window* window)
{
    MIR_Window* mir_window;
    MIR_Data* mir_data;
    MirPixelFormat pixel_format;
    MirBufferUsage buffer_usage;

    MirSurfaceSpec* spec;

    mir_window = SDL_calloc(1, sizeof(MIR_Window));
    if (!mir_window)
        return SDL_OutOfMemory();

    mir_data = _this->driverdata;
    window->driverdata = mir_window;

    if (window->x == SDL_WINDOWPOS_UNDEFINED)
        window->x = 0;

    if (window->y == SDL_WINDOWPOS_UNDEFINED)
        window->y = 0;

    mir_window->mir_data = mir_data;
    mir_window->sdl_window = window;

    pixel_format = MIR_mir_connection_get_egl_pixel_format(mir_data->connection,
                                                           _this->egl_data->egl_display,
                                                           _this->egl_data->egl_config);

    mir_data->pixel_format = pixel_format;
    if (pixel_format == mir_pixel_format_invalid) {
        return SDL_SetError("Failed to find a valid pixel format.");
    }

    buffer_usage = mir_buffer_usage_hardware;
    if (mir_data->software)
        buffer_usage = mir_buffer_usage_software;

    spec = MIR_mir_connection_create_spec_for_normal_surface(mir_data->connection,
                                                             window->w,
                                                             window->h,
                                                             pixel_format);

    MIR_mir_surface_spec_set_buffer_usage(spec, buffer_usage);
    MIR_mir_surface_spec_set_name(spec, "Mir surface");

    mir_window->surface = MIR_mir_surface_create_sync(spec);
    MIR_mir_surface_set_event_handler(mir_window->surface, MIR_HandleEvent, window);

    MIR_mir_surface_spec_release(spec);

    if (!MIR_mir_surface_is_valid(mir_window->surface)) {
        const char* error = MIR_mir_surface_get_error_message(mir_window->surface);
        return SDL_SetError("Failed to created a mir surface: %s", error);
    }

    if (window->flags & SDL_WINDOW_OPENGL) {
        EGLNativeWindowType egl_native_window =
                        (EGLNativeWindowType)MIR_mir_buffer_stream_get_egl_native_window(
                                                       MIR_mir_surface_get_buffer_stream(mir_window->surface));

        mir_window->egl_surface = SDL_EGL_CreateSurface(_this, egl_native_window);

        if (mir_window->egl_surface == EGL_NO_SURFACE) {
            return SDL_SetError("Failed to created a window surface %p",
                                _this->egl_data->egl_display);
        }
    }
    else {
        mir_window->egl_surface = EGL_NO_SURFACE;
    }

    mir_data->current_window = mir_window;

    return 0;
}

void
MIR_DestroyWindow(_THIS, SDL_Window* window)
{
    MIR_Data* mir_data     = _this->driverdata;
    MIR_Window* mir_window = window->driverdata;

    if (mir_data) {
        SDL_EGL_DestroySurface(_this, mir_window->egl_surface);
        MIR_mir_surface_release_sync(mir_window->surface);

        mir_data->current_window = NULL;

        SDL_free(mir_window);
    }
    window->driverdata = NULL;
}

SDL_bool
MIR_GetWindowWMInfo(_THIS, SDL_Window* window, SDL_SysWMinfo* info)
{
    if (info->version.major == SDL_MAJOR_VERSION &&
        info->version.minor == SDL_MINOR_VERSION) {
        MIR_Window* mir_window = window->driverdata;

        info->subsystem = SDL_SYSWM_MIR;
        info->info.mir.connection = mir_window->mir_data->connection;
        info->info.mir.surface = mir_window->surface;

        return SDL_TRUE;
    }

    return SDL_FALSE;
}

void
MIR_SetWindowFullscreen(_THIS, SDL_Window* window,
                        SDL_VideoDisplay* display,
                        SDL_bool fullscreen)
{
    MIR_Data*   mir_data   = _this->driverdata;
    MIR_Window* mir_window = window->driverdata;
    MirSurfaceSpec* spec;
    MirSurfaceState state;

    if (IsSurfaceValid(mir_window) < 0)
        return;

    if (fullscreen) {
        state = mir_surface_state_fullscreen;
    } else {
        state = mir_surface_state_restored;
    }

    spec = MIR_mir_connection_create_spec_for_changes(mir_data->connection);
    MIR_mir_surface_spec_set_state(spec, state);

    MIR_mir_surface_apply_spec(mir_window->surface, spec);
    MIR_mir_surface_spec_release(spec);
}

void
MIR_MaximizeWindow(_THIS, SDL_Window* window)
{
    MIR_Data*   mir_data   = _this->driverdata;
    MIR_Window* mir_window = window->driverdata;
    MirSurfaceSpec* spec;

    if (IsSurfaceValid(mir_window) < 0)
        return;

    spec = MIR_mir_connection_create_spec_for_changes(mir_data->connection);
    MIR_mir_surface_spec_set_state(spec, mir_surface_state_maximized);

    MIR_mir_surface_apply_spec(mir_window->surface, spec);
    MIR_mir_surface_spec_release(spec);
}

void
MIR_MinimizeWindow(_THIS, SDL_Window* window)
{
    MIR_Data*   mir_data   = _this->driverdata;
    MIR_Window* mir_window = window->driverdata;
    MirSurfaceSpec* spec;

    if (IsSurfaceValid(mir_window) < 0)
        return;

    spec = MIR_mir_connection_create_spec_for_changes(mir_data->connection);
    MIR_mir_surface_spec_set_state(spec, mir_surface_state_minimized);

    MIR_mir_surface_apply_spec(mir_window->surface, spec);
    MIR_mir_surface_spec_release(spec);
}

void
MIR_RestoreWindow(_THIS, SDL_Window * window)
{
    MIR_Data*   mir_data   = _this->driverdata;
    MIR_Window* mir_window = window->driverdata;
    MirSurfaceSpec* spec;

    if (IsSurfaceValid(mir_window) < 0)
        return;

    spec = MIR_mir_connection_create_spec_for_changes(mir_data->connection);
    MIR_mir_surface_spec_set_state(spec, mir_surface_state_restored);

    MIR_mir_surface_apply_spec(mir_window->surface, spec);
    MIR_mir_surface_spec_release(spec);
}

void
MIR_HideWindow(_THIS, SDL_Window* window)
{
    MIR_Data*   mir_data   = _this->driverdata;
    MIR_Window* mir_window = window->driverdata;
    MirSurfaceSpec* spec;

    if (IsSurfaceValid(mir_window) < 0)
        return;

    spec = MIR_mir_connection_create_spec_for_changes(mir_data->connection);
    MIR_mir_surface_spec_set_state(spec, mir_surface_state_hidden);

    MIR_mir_surface_apply_spec(mir_window->surface, spec);
    MIR_mir_surface_spec_release(spec);
}

void
MIR_SetWindowSize(_THIS, SDL_Window* window)
{
    MIR_Data*   mir_data   = _this->driverdata;
    MIR_Window* mir_window = window->driverdata;
    MirSurfaceSpec* spec;

    if (IsSurfaceValid(mir_window) < 0)
        return;

    /* You cannot set the x/y of a mir window! So only update w/h */
    spec = MIR_mir_connection_create_spec_for_changes(mir_data->connection);
    MIR_mir_surface_spec_set_width (spec, window->w);
    MIR_mir_surface_spec_set_height(spec, window->h);

    MIR_mir_surface_apply_spec(mir_window->surface, spec);
    MIR_mir_surface_spec_release(spec);
}

void
MIR_SetWindowMinimumSize(_THIS, SDL_Window* window)
{
    MIR_Data*   mir_data   = _this->driverdata;
    MIR_Window* mir_window = window->driverdata;
    MirSurfaceSpec* spec;

    if (IsSurfaceValid(mir_window) < 0)
        return;

    spec = MIR_mir_connection_create_spec_for_changes(mir_data->connection);
    MIR_mir_surface_spec_set_min_width (spec, window->min_w);
    MIR_mir_surface_spec_set_min_height(spec, window->min_h);

    MIR_mir_surface_apply_spec(mir_window->surface, spec);
    MIR_mir_surface_spec_release(spec);
}

void
MIR_SetWindowMaximumSize(_THIS, SDL_Window* window)
{
    MIR_Data*   mir_data   = _this->driverdata;
    MIR_Window* mir_window = window->driverdata;
    MirSurfaceSpec* spec;

    if (IsSurfaceValid(mir_window) < 0)
        return;

    spec = MIR_mir_connection_create_spec_for_changes(mir_data->connection);
    MIR_mir_surface_spec_set_max_width (spec, window->max_w);
    MIR_mir_surface_spec_set_max_height(spec, window->max_h);

    MIR_mir_surface_apply_spec(mir_window->surface, spec);
    MIR_mir_surface_spec_release(spec);
}

void
MIR_SetWindowTitle(_THIS, SDL_Window* window)
{
    MIR_Data*   mir_data   = _this->driverdata;
    MIR_Window* mir_window = window->driverdata;
    char const* title = window->title ? window->title : "";
    MirSurfaceSpec* spec;

    if (IsSurfaceValid(mir_window) < 0)
        return;

    spec = MIR_mir_connection_create_spec_for_changes(mir_data->connection);
    MIR_mir_surface_spec_set_name(spec, title);

    MIR_mir_surface_apply_spec(mir_window->surface, spec);
    MIR_mir_surface_spec_release(spec);
}

#endif /* SDL_VIDEO_DRIVER_MIR */

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