/*
 * Copyright (C) 2018 Igalia S.L.
 *
 * 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 APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
 */

#pragma once

#include "ViewBackend.h"
#include "xdg-shell-unstable-v6-client-protocol.h"
#include <glib.h>
#include <unordered_map>
#include <wpe/fdo.h>

typedef void* EGLConfig;
typedef void* EGLContext;
typedef void* EGLDisplay;
typedef void* EGLSurface;
typedef struct wl_egl_window *EGLNativeWindowType;

// Manually provide the EGL_CAST C++ definition in case eglplatform.h doesn't provide it.
#ifndef EGL_CAST
#define EGL_CAST(type, value) (static_cast<type>(value))
#endif

struct wpe_fdo_egl_exported_image;

namespace WPEToolingBackends {

class WindowViewBackend final : public ViewBackend {
public:
    WindowViewBackend(uint32_t width, uint32_t height);
    virtual ~WindowViewBackend();

    struct wpe_view_backend* backend() const override;

private:
    void createViewTexture();
    void resize(uint32_t width, uint32_t height);

    bool initialize(EGLDisplay);
    void deinitialize(EGLDisplay);

    void displayBuffer(struct wpe_fdo_egl_exported_image*);
#if WPE_FDO_CHECK_VERSION(1, 5, 0)
    void displayBuffer(struct wpe_fdo_shm_exported_buffer*);
#endif

    static const struct wl_registry_listener s_registryListener;
    static const struct zxdg_shell_v6_listener s_xdgWmBaseListener;
    static const struct wl_pointer_listener s_pointerListener;
    static const struct wl_keyboard_listener s_keyboardListener;
    static const struct wl_touch_listener s_touchListener;
    static const struct wl_seat_listener s_seatListener;
    static const struct wl_callback_listener s_frameListener;
    static const struct zxdg_surface_v6_listener s_xdgSurfaceListener;
    static const struct zxdg_toplevel_v6_listener s_xdgToplevelListener;

#if WPE_CHECK_VERSION(1, 11, 1)
    static bool onDOMFullscreenRequest(void* data, bool fullscreen);
    void dispatchFullscreenEvent();
#endif
    void onFullscreenChanged(bool fullscreen);

    void handleKeyEvent(uint32_t key, uint32_t state, uint32_t time);
    uint32_t modifiers() const;

    struct SeatData {
        struct {
            struct wl_pointer* object { nullptr };
            struct wl_surface* target { nullptr };
            std::pair<int, int> coords { 0, 0 };
            uint32_t button { 0 };
            uint32_t state { 0 };
            uint32_t modifiers { 0 };
        } pointer;

        struct {
            struct wl_keyboard* object { nullptr };
            struct wl_surface* target { nullptr };
            uint32_t modifiers { 0 };
        } keyboard;

        struct {
            struct wl_touch* object { nullptr };
            struct wpe_input_touch_event_raw points[10];
            bool tracking { false };
        } touch;

        struct {
            int32_t horizontal { 0 };
            int32_t vertical { 0 };
        } axis_discrete;

        struct {
            int32_t rate { 0 };
            int32_t delay { 0 };
        } repeatInfo;

        struct {
            uint32_t key { 0 };
            uint32_t time { 0 };
            uint32_t state { 0 };
            uint32_t eventSource { 0 };
        } repeatData;

    } m_seatData;

    struct {
        uint32_t width;
        uint32_t height;
    } m_initialSize;

    struct wpe_view_backend_exportable_fdo* m_exportable { nullptr };

    struct wl_display* m_display { nullptr };
    struct wl_compositor* m_compositor { nullptr };
    struct zxdg_shell_v6* m_xdg { nullptr };
    struct wl_seat* m_seat { nullptr };
    GSource* m_eventSource { nullptr };
    struct wl_surface* m_surface { nullptr };
    struct zxdg_surface_v6* m_xdgSurface { nullptr };
    struct zxdg_toplevel_v6* m_xdgToplevel { nullptr };
    struct wl_egl_window* m_eglWindow { nullptr };
    EGLContext m_eglContext { nullptr };
    EGLConfig m_eglConfig;
    EGLSurface m_eglSurface { nullptr };
    unsigned m_program { 0 };
    unsigned m_textureUniform { 0 };
    unsigned m_viewTexture { 0 };
    struct wpe_fdo_egl_exported_image* m_committedImage { nullptr };
    bool m_is_fullscreen { false };
#if WPE_CHECK_VERSION(1, 11, 1)
    bool m_waiting_fullscreen_notify { false };
#endif
};

} // WPEToolingBackends