/*************************************************************************/
/*  export.cpp                                                           */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#include "export.h"

#include "export_plugin.h"

static Error fixup_embedded_pck(const String &p_path, int64_t p_embedded_start, int64_t p_embedded_size);

void register_windows_exporter() {
	EDITOR_DEF("export/windows/rcedit", "");
	EditorSettings::get_singleton()->add_property_hint(PropertyInfo(Variant::STRING, "export/windows/rcedit", PROPERTY_HINT_GLOBAL_FILE, "*.exe"));
#ifdef WINDOWS_ENABLED
	EDITOR_DEF("export/windows/signtool", "");
	EditorSettings::get_singleton()->add_property_hint(PropertyInfo(Variant::STRING, "export/windows/signtool", PROPERTY_HINT_GLOBAL_FILE, "*.exe"));
#else
	EDITOR_DEF("export/windows/osslsigncode", "");
	EditorSettings::get_singleton()->add_property_hint(PropertyInfo(Variant::STRING, "export/windows/osslsigncode", PROPERTY_HINT_GLOBAL_FILE));
	// On non-Windows we need WINE to run rcedit
	EDITOR_DEF("export/windows/wine", "");
	EditorSettings::get_singleton()->add_property_hint(PropertyInfo(Variant::STRING, "export/windows/wine", PROPERTY_HINT_GLOBAL_FILE));
#endif

	Ref<EditorExportPlatformWindows> platform;
	platform.instantiate();

	Ref<Image> img = memnew(Image(_windows_logo));
	Ref<ImageTexture> logo;
	logo.instantiate();
	logo->create_from_image(img);
	platform->set_logo(logo);
	platform->set_name("Windows Desktop");
	platform->set_extension("exe");
	platform->set_release_32("windows_32_release.exe");
	platform->set_debug_32("windows_32_debug.exe");
	platform->set_release_64("windows_64_release.exe");
	platform->set_debug_64("windows_64_debug.exe");
	platform->set_os_name("Windows");
	platform->set_fixup_embedded_pck_func(&fixup_embedded_pck);

	EditorExport::get_singleton()->add_export_platform(platform);
}

static Error fixup_embedded_pck(const String &p_path, int64_t p_embedded_start, int64_t p_embedded_size) {
	// Patch the header of the "pck" section in the PE file so that it corresponds to the embedded data

	FileAccess *f = FileAccess::open(p_path, FileAccess::READ_WRITE);
	if (!f) {
		return ERR_CANT_OPEN;
	}

	// Jump to the PE header and check the magic number
	{
		f->seek(0x3c);
		uint32_t pe_pos = f->get_32();

		f->seek(pe_pos);
		uint32_t magic = f->get_32();
		if (magic != 0x00004550) {
			f->close();
			return ERR_FILE_CORRUPT;
		}
	}

	// Process header

	int num_sections;
	{
		int64_t header_pos = f->get_position();

		f->seek(header_pos + 2);
		num_sections = f->get_16();
		f->seek(header_pos + 16);
		uint16_t opt_header_size = f->get_16();

		// Skip rest of header + optional header to go to the section headers
		f->seek(f->get_position() + 2 + opt_header_size);
	}

	// Search for the "pck" section

	int64_t section_table_pos = f->get_position();

	bool found = false;
	for (int i = 0; i < num_sections; ++i) {
		int64_t section_header_pos = section_table_pos + i * 40;
		f->seek(section_header_pos);

		uint8_t section_name[9];
		f->get_buffer(section_name, 8);
		section_name[8] = '\0';

		if (strcmp((char *)section_name, "pck") == 0) {
			// "pck" section found, let's patch!

			// Set virtual size to a little to avoid it taking memory (zero would give issues)
			f->seek(section_header_pos + 8);
			f->store_32(8);

			f->seek(section_header_pos + 16);
			f->store_32(p_embedded_size);
			f->seek(section_header_pos + 20);
			f->store_32(p_embedded_start);

			found = true;
			break;
		}
	}

	f->close();

	return found ? OK : ERR_FILE_CORRUPT;
}