#include "./sha1_ngcft1.hpp"

#include <solanaceae/toxcore/utils.hpp>

#include <solanaceae/contact/components.hpp>
#include <solanaceae/tox_contacts/components.hpp>
#include <solanaceae/message3/components.hpp>

#include <solanaceae/message3/file_r_file.hpp>

#include "./ft1_sha1_info.hpp"
#include "./hash_utils.hpp"

#include <iostream>

namespace Components {

	using FT1InfoSHA1 = FT1InfoSHA1;

	struct FT1InfoSHA1Data {
		std::vector<uint8_t> data;
	};

	struct FT1InfoSHA1Hash {
		std::vector<uint8_t> hash;
	};

} // Components

SHA1_NGCFT1::SHA1_NGCFT1(
	Contact3Registry& cr,
	RegistryMessageModel& rmm,
	NGCFT1& nft,
	ToxContactModel2& tcm
) :
	_cr(cr),
	_rmm(rmm),
	_nft(nft),
	_tcm(tcm)
{
	_nft.subscribe(this, NGCFT1_Event::recv_request);
	_nft.subscribe(this, NGCFT1_Event::recv_init);
	_nft.subscribe(this, NGCFT1_Event::recv_data);
	_nft.subscribe(this, NGCFT1_Event::send_data);

	//_rmm.subscribe(this, RegistryMessageModel_Event::message_construct);
	//_rmm.subscribe(this, RegistryMessageModel_Event::message_updated);
	//_rmm.subscribe(this, RegistryMessageModel_Event::message_destroy);

	_rmm.subscribe(this, RegistryMessageModel_Event::send_file_path);
}

bool SHA1_NGCFT1::onEvent(const Events::NGCFT1_recv_request& e) {
	// only interested in sha1
	if (e.file_kind != NGCFT1_file_kind::HASH_SHA1_INFO && e.file_kind != NGCFT1_file_kind::HASH_SHA1_CHUNK) {
		return false;
	}

	//std::cout << "SHA1_NGCFT1: FT1_REQUEST fk:" << int(e.file_kind) << " [" << bin2hex({e.file_id, e.file_id+e.file_id_size}) << "]\n";

	if (e.file_kind == NGCFT1_file_kind::HASH_SHA1_INFO) {
		if (e.file_id_size != 20) {
			// error
			return false;
		}

		SHA1Digest info_hash{e.file_id, e.file_id_size};
		if (!_info_to_message.count(info_hash)) {
			// we dont know about this
			return false;
		}

		auto msg = _info_to_message.at(info_hash);

		assert(msg.all_of<Components::FT1InfoSHA1Data>());

		// assume we have the info, send init
		_nft.NGC_FT1_send_init_private(
			e.group_number, e.peer_number,
			static_cast<uint32_t>(e.file_kind),
			e.file_id, e.file_id_size,
			msg.get<Components::FT1InfoSHA1Data>().data.size(),
			nullptr
		);
	}

	return false;
}

bool SHA1_NGCFT1::onEvent(const Events::NGCFT1_recv_init& e) {
	// only interested in sha1
	if (e.file_kind != NGCFT1_file_kind::HASH_SHA1_INFO && e.file_kind != NGCFT1_file_kind::HASH_SHA1_CHUNK) {
		return false;
	}

	return false;
}

bool SHA1_NGCFT1::onEvent(const Events::NGCFT1_recv_data& e) {
	return false;
}

bool SHA1_NGCFT1::onEvent(const Events::NGCFT1_send_data& e) {
	return false;
}

bool SHA1_NGCFT1::sendFilePath(const Contact3 c, std::string_view file_name, std::string_view file_path) {
	if (
		// TODO: add support of offline queuing
		!_cr.all_of<Contact::Components::ToxGroupEphemeral>(c)
	) {
		return false;
	}

	std::cout << "SHA1_NGCFT1: got sendFilePath()\n";

	auto* reg_ptr = _rmm.get(c);
	if (reg_ptr == nullptr) {
		return false;
	}

	// TODO: rw
	auto file_impl = std::make_unique<FileRFile>(file_path);
	if (!file_impl->isGood()) {
		std::cerr << "SHA1_NGCFT1 error: failed opening file '" << file_path << "'!\n";
		return true;
	}

	// get current time unix epoch utc
	uint64_t ts = std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count();

	// 1. build info by hashing all chunks

	FT1InfoSHA1 sha1_info;
	// build info
	sha1_info.file_name = file_name;
	sha1_info.file_size = file_impl->_file_size;

	{ // build chunks
		// HACK: load file fully
		// TODO: the speed is truly horrid
		const auto file_data = file_impl->read(0, file_impl->_file_size);
		size_t i = 0;
		for (; i + sha1_info.chunk_size < file_data.size(); i += sha1_info.chunk_size) {
			sha1_info.chunks.push_back(hash_sha1(file_data.data()+i, sha1_info.chunk_size));
		}

		if (i < file_data.size()) {
			sha1_info.chunks.push_back(hash_sha1(file_data.data()+i, file_data.size()-i));
		}
	}

	// 2. hash info
	std::vector<uint8_t> sha1_info_data;
	std::vector<uint8_t> sha1_info_hash;

	std::cout << "SHA1_NGCFT1 info is: \n" << sha1_info;
	sha1_info_data = sha1_info.toBuffer();
	std::cout << "SHA1_NGCFT1 sha1_info size: " << sha1_info_data.size() << "\n";
	sha1_info_hash = hash_sha1(sha1_info_data.data(), sha1_info_data.size());
	std::cout << "SHA1_NGCFT1 sha1_info_hash: " << bin2hex(sha1_info_hash) << "\n";

	const auto c_self = _cr.get<Contact::Components::Self>(c).self;
	if (!_cr.valid(c_self)) {
		std::cerr << "SHA1_NGCFT1 error: failed to get self!\n";
		return true;
	}

	const auto e = reg_ptr->create();
	reg_ptr->emplace<Message::Components::ContactTo>(e, c);
	reg_ptr->emplace<Message::Components::ContactFrom>(e, c_self);
	reg_ptr->emplace<Message::Components::Timestamp>(e, ts); // reactive?

	reg_ptr->emplace<Message::Components::Transfer::TagHaveAll>(e);
	reg_ptr->emplace<Message::Components::Transfer::TagSending>(e);

	reg_ptr->emplace<Components::FT1InfoSHA1>(e, sha1_info);
	reg_ptr->emplace<Components::FT1InfoSHA1Data>(e, sha1_info_data); // keep around? or file?
	reg_ptr->emplace<Components::FT1InfoSHA1Hash>(e, sha1_info_hash);
	_info_to_message[sha1_info_hash] = {*reg_ptr, e};

	//reg_ptr->emplace<Message::Components::Transfer::FileKind>(e, file_kind);
	// file id would be sha1_info hash or something
	//reg_ptr->emplace<Message::Components::Transfer::FileID>(e, file_id);

	{ // file info
		auto& file_info = reg_ptr->emplace<Message::Components::Transfer::FileInfo>(e);
		file_info.file_list.emplace_back() = {std::string{file_name}, file_impl->_file_size};
		file_info.total_size = file_impl->_file_size;

		reg_ptr->emplace<Message::Components::Transfer::FileInfoLocal>(e, std::vector{std::string{file_path}});
	}

	reg_ptr->emplace<Message::Components::Transfer::BytesSent>(e);

	// TODO: determine if this is true
	//reg_ptr->emplace<Message::Components::Transfer::TagPaused>(e);

	// TODO: ft1 specific comp
	reg_ptr->emplace<Message::Components::Transfer::File>(e, std::move(file_impl));
#if 0
	const auto friend_number = _cr.get<Contact::Components::ToxFriendEphemeral>(c).friend_number;
	const auto&& [transfer_id, err] = _t.toxFileSend(friend_number, file_kind, file_impl->_file_size, file_id, file_name);
	if (err == TOX_ERR_FILE_SEND_OK) {
		reg_ptr->emplace<Message::Components::Transfer::ToxTransferFriend>(e, friend_number, transfer_id.value());
		// TODO: add tag signifying init sent status?

		toxFriendLookupAdd({*reg_ptr, e});
	} // else queue?
#endif

	_rmm.throwEventConstruct(*reg_ptr, e);

	return true;
}