/*************************************************************************/
/*  os_web.h                                                             */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
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/*************************************************************************/

#ifndef OS_WEB_H
#define OS_WEB_H

#include "audio_driver_web.h"
#include "core/input/input.h"
#include "drivers/unix/os_unix.h"
#include "servers/audio_server.h"

#include <emscripten/html5.h>

class OS_Web : public OS_Unix {
	MainLoop *main_loop = nullptr;
	List<AudioDriverWeb *> audio_drivers;

	bool idb_is_syncing = false;
	bool idb_available = false;
	bool idb_needs_sync = false;
	bool pwa_is_waiting = false;

	static void main_loop_callback();

	static void file_access_close_callback(const String &p_file, int p_flags);
	static void fs_sync_callback();
	static void update_pwa_state_callback();

protected:
	void initialize() override;

	void set_main_loop(MainLoop *p_main_loop) override;
	void delete_main_loop() override;

	void finalize() override;

	bool _check_internal_feature_support(const String &p_feature) override;

public:
	// Override return type to make writing static callbacks less tedious.
	static OS_Web *get_singleton();

	bool pwa_needs_update() const { return pwa_is_waiting; }
	Error pwa_update();
	void force_fs_sync();

	void initialize_joypads() override;

	MainLoop *get_main_loop() const override;
	bool main_loop_iterate();

	Error execute(const String &p_path, const List<String> &p_arguments, String *r_pipe = nullptr, int *r_exitcode = nullptr, bool read_stderr = false, Mutex *p_pipe_mutex = nullptr, bool p_open_console = false) override;
	Error create_process(const String &p_path, const List<String> &p_arguments, ProcessID *r_child_id = nullptr, bool p_open_console = false) override;
	Error kill(const ProcessID &p_pid) override;
	int get_process_id() const override;
	bool is_process_running(const ProcessID &p_pid) const override;
	int get_processor_count() const override;
	int get_default_thread_pool_size() const override { return 1; }

	String get_executable_path() const override;
	Error shell_open(String p_uri) override;
	String get_name() const override;
	// Override default OS implementation which would block the main thread with delay_usec.
	// Implemented in web_main.cpp loop callback instead.
	void add_frame_delay(bool p_can_draw) override {}

	void vibrate_handheld(int p_duration_ms) override;

	String get_cache_path() const override;
	String get_config_path() const override;
	String get_data_path() const override;
	String get_user_data_dir() const override;

	bool is_userfs_persistent() const override;

	void alert(const String &p_alert, const String &p_title = "ALERT!") override;

	Error open_dynamic_library(const String p_path, void *&p_library_handle, bool p_also_set_library_path = false, String *r_resolved_path = nullptr) override;

	void resume_audio();

	OS_Web();
};

#endif // OS_WEB_H