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

#ifdef MINIZIP_ENABLED

#include "file_access_zip.h"

#include "core/io/file_access.h"

ZipArchive *ZipArchive::instance = nullptr;

extern "C" {

struct ZipData {
	Ref<FileAccess> f;
};

static void *godot_open(voidpf opaque, const char *p_fname, int mode) {
	if (mode & ZLIB_FILEFUNC_MODE_WRITE) {
		return nullptr;
	}

	Ref<FileAccess> f = FileAccess::open(p_fname, FileAccess::READ);
	ERR_FAIL_COND_V(f.is_null(), nullptr);

	ZipData *zd = memnew(ZipData);
	zd->f = f;
	return zd;
}

static uLong godot_read(voidpf opaque, voidpf stream, void *buf, uLong size) {
	ZipData *zd = (ZipData *)stream;
	zd->f->get_buffer((uint8_t *)buf, size);
	return size;
}

static uLong godot_write(voidpf opaque, voidpf stream, const void *buf, uLong size) {
	return 0;
}

static long godot_tell(voidpf opaque, voidpf stream) {
	ZipData *zd = (ZipData *)stream;
	return zd->f->get_position();
}

static long godot_seek(voidpf opaque, voidpf stream, uLong offset, int origin) {
	ZipData *zd = (ZipData *)stream;

	uint64_t pos = offset;
	switch (origin) {
		case ZLIB_FILEFUNC_SEEK_CUR:
			pos = zd->f->get_position() + offset;
			break;
		case ZLIB_FILEFUNC_SEEK_END:
			pos = zd->f->get_length() + offset;
			break;
		default:
			break;
	}

	zd->f->seek(pos);
	return 0;
}

static int godot_close(voidpf opaque, voidpf stream) {
	ZipData *zd = (ZipData *)stream;
	memdelete(zd);
	return 0;
}

static int godot_testerror(voidpf opaque, voidpf stream) {
	ZipData *zd = (ZipData *)stream;
	return zd->f->get_error() != OK ? 1 : 0;
}

static voidpf godot_alloc(voidpf opaque, uInt items, uInt size) {
	return memalloc((size_t)items * size);
}

static void godot_free(voidpf opaque, voidpf address) {
	memfree(address);
}
} // extern "C"

void ZipArchive::close_handle(unzFile p_file) const {
	ERR_FAIL_COND_MSG(!p_file, "Cannot close a file if none is open.");
	unzCloseCurrentFile(p_file);
	unzClose(p_file);
}

unzFile ZipArchive::get_file_handle(String p_file) const {
	ERR_FAIL_COND_V_MSG(!file_exists(p_file), nullptr, "File '" + p_file + " doesn't exist.");
	File file = files[p_file];

	zlib_filefunc_def io;
	memset(&io, 0, sizeof(io));

	io.opaque = nullptr;
	io.zopen_file = godot_open;
	io.zread_file = godot_read;
	io.zwrite_file = godot_write;

	io.ztell_file = godot_tell;
	io.zseek_file = godot_seek;
	io.zclose_file = godot_close;
	io.zerror_file = godot_testerror;

	io.alloc_mem = godot_alloc;
	io.free_mem = godot_free;

	unzFile pkg = unzOpen2(packages[file.package].filename.utf8().get_data(), &io);
	ERR_FAIL_COND_V_MSG(!pkg, nullptr, "Cannot open file '" + packages[file.package].filename + "'.");
	int unz_err = unzGoToFilePos(pkg, &file.file_pos);
	if (unz_err != UNZ_OK || unzOpenCurrentFile(pkg) != UNZ_OK) {
		unzClose(pkg);
		ERR_FAIL_V(nullptr);
	}

	return pkg;
}

bool ZipArchive::try_open_pack(const String &p_path, bool p_replace_files, uint64_t p_offset = 0) {
	// load with offset feature only supported for PCK files
	ERR_FAIL_COND_V_MSG(p_offset != 0, false, "Invalid PCK data. Note that loading files with a non-zero offset isn't supported with ZIP archives.");

	if (p_path.get_extension().nocasecmp_to("zip") != 0 && p_path.get_extension().nocasecmp_to("pcz") != 0) {
		return false;
	}

	zlib_filefunc_def io;
	memset(&io, 0, sizeof(io));

	io.opaque = nullptr;
	io.zopen_file = godot_open;
	io.zread_file = godot_read;
	io.zwrite_file = godot_write;

	io.ztell_file = godot_tell;
	io.zseek_file = godot_seek;
	io.zclose_file = godot_close;
	io.zerror_file = godot_testerror;

	unzFile zfile = unzOpen2(p_path.utf8().get_data(), &io);
	ERR_FAIL_COND_V(!zfile, false);

	unz_global_info64 gi;
	int err = unzGetGlobalInfo64(zfile, &gi);
	ERR_FAIL_COND_V(err != UNZ_OK, false);

	Package pkg;
	pkg.filename = p_path;
	pkg.zfile = zfile;
	packages.push_back(pkg);
	int pkg_num = packages.size() - 1;

	for (uint64_t i = 0; i < gi.number_entry; i++) {
		char filename_inzip[256];

		unz_file_info64 file_info;
		err = unzGetCurrentFileInfo64(zfile, &file_info, filename_inzip, sizeof(filename_inzip), nullptr, 0, nullptr, 0);
		ERR_CONTINUE(err != UNZ_OK);

		File f;
		f.package = pkg_num;
		unzGetFilePos(zfile, &f.file_pos);

		String fname = String("res://") + String::utf8(filename_inzip);
		files[fname] = f;

		uint8_t md5[16] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
		PackedData::get_singleton()->add_path(p_path, fname, 1, 0, md5, this, p_replace_files, false);
		//printf("packed data add path %s, %s\n", p_name.utf8().get_data(), fname.utf8().get_data());

		if ((i + 1) < gi.number_entry) {
			unzGoToNextFile(zfile);
		}
	}

	return true;
}

bool ZipArchive::file_exists(String p_name) const {
	return files.has(p_name);
}

Ref<FileAccess> ZipArchive::get_file(const String &p_path, PackedData::PackedFile *p_file) {
	return memnew(FileAccessZip(p_path, *p_file));
}

ZipArchive *ZipArchive::get_singleton() {
	if (instance == nullptr) {
		instance = memnew(ZipArchive);
	}

	return instance;
}

ZipArchive::ZipArchive() {
	instance = this;
}

ZipArchive::~ZipArchive() {
	for (int i = 0; i < packages.size(); i++) {
		unzClose(packages[i].zfile);
	}

	packages.clear();
}

Error FileAccessZip::_open(const String &p_path, int p_mode_flags) {
	close();

	ERR_FAIL_COND_V(p_mode_flags & FileAccess::WRITE, FAILED);
	ZipArchive *arch = ZipArchive::get_singleton();
	ERR_FAIL_COND_V(!arch, FAILED);
	zfile = arch->get_file_handle(p_path);
	ERR_FAIL_COND_V(!zfile, FAILED);

	int err = unzGetCurrentFileInfo64(zfile, &file_info, nullptr, 0, nullptr, 0, nullptr, 0);
	ERR_FAIL_COND_V(err != UNZ_OK, FAILED);

	return OK;
}

void FileAccessZip::close() {
	if (!zfile) {
		return;
	}

	ZipArchive *arch = ZipArchive::get_singleton();
	ERR_FAIL_COND(!arch);
	arch->close_handle(zfile);
	zfile = nullptr;
}

bool FileAccessZip::is_open() const {
	return zfile != nullptr;
}

void FileAccessZip::seek(uint64_t p_position) {
	ERR_FAIL_COND(!zfile);

	unzSeekCurrentFile(zfile, p_position);
}

void FileAccessZip::seek_end(int64_t p_position) {
	ERR_FAIL_COND(!zfile);
	unzSeekCurrentFile(zfile, get_length() + p_position);
}

uint64_t FileAccessZip::get_position() const {
	ERR_FAIL_COND_V(!zfile, 0);
	return unztell(zfile);
}

uint64_t FileAccessZip::get_length() const {
	ERR_FAIL_COND_V(!zfile, 0);
	return file_info.uncompressed_size;
}

bool FileAccessZip::eof_reached() const {
	ERR_FAIL_COND_V(!zfile, true);

	return at_eof;
}

uint8_t FileAccessZip::get_8() const {
	uint8_t ret = 0;
	get_buffer(&ret, 1);
	return ret;
}

uint64_t FileAccessZip::get_buffer(uint8_t *p_dst, uint64_t p_length) const {
	ERR_FAIL_COND_V(!p_dst && p_length > 0, -1);
	ERR_FAIL_COND_V(!zfile, -1);

	at_eof = unzeof(zfile);
	if (at_eof) {
		return 0;
	}
	int64_t read = unzReadCurrentFile(zfile, p_dst, p_length);
	ERR_FAIL_COND_V(read < 0, read);
	if ((uint64_t)read < p_length) {
		at_eof = true;
	}
	return read;
}

Error FileAccessZip::get_error() const {
	if (!zfile) {
		return ERR_UNCONFIGURED;
	}
	if (eof_reached()) {
		return ERR_FILE_EOF;
	}

	return OK;
}

void FileAccessZip::flush() {
	ERR_FAIL();
}

void FileAccessZip::store_8(uint8_t p_dest) {
	ERR_FAIL();
}

bool FileAccessZip::file_exists(const String &p_name) {
	return false;
}

FileAccessZip::FileAccessZip(const String &p_path, const PackedData::PackedFile &p_file) {
	_open(p_path, FileAccess::READ);
}

FileAccessZip::~FileAccessZip() {
	close();
}

#endif // MINIZIP_ENABLED