#include "extension.h"
#include "module.h"
#include "blockmarkup.h"
#include <fstream>

extern const wchar_t* REGEX_REPLACER_INSTRUCTIONS;

const char* REGEX_REPLACEMENTS_SAVE_FILE = "SavedRegexReplacements.txt";

std::optional<std::wregex> regex;
concurrency::reader_writer_lock m;

BOOL WINAPI DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
	{
		if (!std::ifstream(REGEX_REPLACEMENTS_SAVE_FILE).good())
			{
			auto file = std::ofstream(REGEX_REPLACEMENTS_SAVE_FILE, std::ios::binary) << "\xff\xfe";
			for (auto ch : std::wstring_view(REGEX_REPLACER_INSTRUCTIONS))
				file << (ch == L'\n' ? std::string_view("\r\0\n", 4) : std::string_view((char*)&ch, 2));
			_spawnlp(_P_DETACH, "notepad", "notepad", REGEX_REPLACEMENTS_SAVE_FILE, NULL); // show file to user
		}
	}
	break;
	case DLL_PROCESS_DETACH:
	{
	}
	break;
	}
	return TRUE;
}

bool ProcessSentence(std::wstring& sentence, SentenceInfo sentenceInfo)
{
	if (!sentenceInfo["current select"] || sentenceInfo["text number"] == 0) return false;

	std::ifstream stream(REGEX_REPLACEMENTS_SAVE_FILE, std::ios::binary);
	BlockMarkupIterator savedFilters(stream, Array<std::wstring_view>{ L"|REGEX|", L"|BECOMES|" });
	concurrency::reader_writer_lock::scoped_lock_read readLock(m);
	while (auto read = savedFilters.Next()) {
		const auto& [regex, replacement] = read.value();
		if (regex == L"") continue;
		try { ::regex = regex; }
		catch (std::regex_error) { continue; }
		sentence = std::regex_replace(sentence, ::regex.value(), replacement);
	}
	return true;
}