#include "gtest/gtest.h"
#include "io.cpp"

#ifndef TEST_WORK_DIR
#error Please define TEST_WORK_DIR
#endif

const std::string folder{TEST_WORK_DIR};
const std::string noexist{TEST_WORK_DIR "/nope"};
const std::string empty{TEST_WORK_DIR "/empty"};
const std::string text{TEST_WORK_DIR "/test.txt"};
const std::string image{TEST_WORK_DIR "/mangoni.jpg"};

static std::vector<unsigned char> generic_read_file(const std::string& filename){
	auto ifstream = std::ifstream{filename, std::ios::binary};
	auto path = std::filesystem::path{filename};
	auto size = std::filesystem::file_size(path);
	std::vector<unsigned char> buf(size);
	ifstream.read(reinterpret_cast<char*>(buf.data()), size);
	return buf;
}

TEST(IoTests, FsPlainInput) {
	EXPECT_THROW(horcrux::FsPlainInput input{noexist}, std::invalid_argument);
	EXPECT_THROW(horcrux::FsPlainInput input{folder}, std::invalid_argument);
	EXPECT_THROW(horcrux::FsPlainInput input{empty}, std::invalid_argument);
	EXPECT_NO_THROW(horcrux::FsPlainInput input{text});
	EXPECT_NO_THROW(horcrux::FsPlainInput input{image});
}

TEST(IoTests, FsPlainInputReadText) {
	auto input = horcrux::FsPlainInput{text};
	auto buf = generic_read_file(text);
	EXPECT_EQ(buf, input.read());
}

TEST(IoTests, FsPlainInputReadImg) {
	auto input = horcrux::FsPlainInput{image};
	auto buf = generic_read_file(image);
	EXPECT_EQ(buf, input.read());
}

TEST(IoTests, FsCryptoOutput) {
	EXPECT_THROW(horcrux::FsCryptoOutput output(noexist, 1), std::invalid_argument);
	EXPECT_NO_THROW(horcrux::FsCryptoOutput output(folder, 1));
	EXPECT_THROW(horcrux::FsCryptoOutput output(folder, 0), std::invalid_argument);
	EXPECT_THROW(horcrux::FsCryptoOutput output(empty, 1), std::invalid_argument);
	EXPECT_THROW(horcrux::FsCryptoOutput output(text, 1), std::invalid_argument);
	EXPECT_THROW(horcrux::FsCryptoOutput output(image, 1), std::invalid_argument);
}

TEST(IoTests, FsCryptoOutputWriteImage){
	auto ifstream = std::ifstream{image, std::ios::binary};
	auto buf = generic_read_file(image);

	horcrux::FsCryptoOutput out(folder, 10);
	auto written = out.write(buf);
	EXPECT_EQ(written, buf.size());

	EXPECT_EQ(10, out.created_files.size());
	for_each(out.created_files.begin(), out.created_files.end(),
			[](auto f){std::filesystem::remove(f);});
}

TEST(IoTests, FsCryptoOutputWriteText){
	auto buf = generic_read_file(text);

	horcrux::FsCryptoOutput out(folder, 2);
	auto written = out.write(buf);
	EXPECT_EQ(written, buf.size());

	EXPECT_EQ(2, out.created_files.size());
	for_each(out.created_files.begin(), out.created_files.end(),
			[](auto f){std::filesystem::remove(f);});
}

TEST(IoTest, FsCryptoInput){
	EXPECT_THROW(horcrux::FsCryptoInput output({noexist, text, image}), std::invalid_argument);
	EXPECT_THROW(horcrux::FsCryptoInput output({folder, text, image}), std::invalid_argument);
	EXPECT_THROW(horcrux::FsCryptoInput output({}), std::invalid_argument);
	EXPECT_THROW(horcrux::FsCryptoInput output({empty}), std::invalid_argument);
	EXPECT_THROW(horcrux::FsCryptoInput output({empty, empty}), std::invalid_argument);
	EXPECT_NO_THROW(horcrux::FsCryptoInput output({empty, empty, text}));
	EXPECT_NO_THROW(horcrux::FsCryptoInput output({image, empty, text}));
}

TEST(IoTest, FsCryptoInputImage){
	auto buf = generic_read_file(image);
	//split image using FsCryptoOutput
	auto out = horcrux::FsCryptoOutput(folder, 7);
	auto written = out.write(buf);
	EXPECT_EQ(written, buf.size());

	std::vector<std::string> files;
	transform(out.created_files.begin(), out.created_files.end(),std::back_inserter(files), [](auto p){return p.string();});
	auto in = horcrux::FsCryptoInput(files);
	auto read = in.read();
	EXPECT_EQ(read, buf);

	files.push_back(text);
	in = horcrux::FsCryptoInput(files);
	read = in.read();
	EXPECT_NE(read, buf);

	for_each(out.created_files.begin(), out.created_files.end(),
			[](auto f){std::filesystem::remove(f);});
}

TEST(IoTest, FsPlainOuput){

	EXPECT_NO_THROW(horcrux::FsPlainOutput output{noexist});
	EXPECT_THROW(horcrux::FsPlainOutput output{folder}, std::invalid_argument);
	EXPECT_NO_THROW(horcrux::FsPlainOutput output{empty});
	EXPECT_NO_THROW(horcrux::FsPlainOutput output{text});
	EXPECT_NO_THROW(horcrux::FsPlainOutput output{image});
}

TEST(IoTest, FsPlainOutputWrite){
	auto buf = generic_read_file(image);
	auto out = horcrux::FsPlainOutput(noexist);
	auto written = out.write(buf);
	EXPECT_EQ(written, buf.size());
	auto buf2 = generic_read_file(noexist);
	EXPECT_EQ(buf, buf2);
	std::filesystem::remove(noexist);
}