#include "CodegenInput.hpp"

#include <Macros.hpp>
#include <Utils.hpp>

#include <robin_hood.h>
#include <variant>

struct SomeDecl {
	std::variant<DeclStruct, DeclFunction, DeclEnum> v;
};

class CodegenInput::Private {
public:
	// We want address stability for everything
	robin_hood::unordered_node_map<std::string, SomeDecl, StringHash, StringEqual> decls;
	robin_hood::unordered_node_map<std::string, DeclNamespace, StringHash, StringEqual> namespaces;
};

CodegenInput::CodegenInput()
	: m{ new Private() } //
{
}

CodegenInput::~CodegenInput() {
	delete m;
}

#define STORE_DECL_OF_TYPE(DeclType, fullname, decl)                                                    \
	auto [iter, success] = m->decls.try_emplace(std::move(fullname), SomeDecl{ .v = std::move(decl) }); \
	auto& key = iter->first;                                                                            \
	auto& val = iter->second;                                                                           \
	auto& declRef = std::get<DeclType>(val.v);                                                          \
	declRef.fullname = key;                                                                             \
	return &declRef

DeclEnum* CodegenInput::AddEnum(std::string fullname, DeclEnum decl) {
#if CODEGEN_DEBUG_PRINT
	printf("Committed enum '%s'\n", decl.name.c_str());
	for (auto& elm : decl.elements) {
		printf("  - element %s = %" PRId64 "\n", elm.name.c_str(), elm.value);
	}
#endif

	STORE_DECL_OF_TYPE(DeclEnum, fullname, decl);
}

DeclStruct* CodegenInput::AddStruct(std::string fullname, DeclStruct decl) {
#if CODEGEN_DEBUG_PRINT
	printf("Committed struct '%s'\n", decl.name.c_str());
	printf("  Base classes:\n");
	for (auto& base : decl.baseClasses) {
		printf("  - %.*s\n", PRINTF_STRING_VIEW(base->name));
	}
#endif

	STORE_DECL_OF_TYPE(DeclStruct, fullname, decl);
}

#define FIND_DECL_OF_TYPE(DeclType)                     \
	auto iter = m->decls.find(name);                    \
	if (iter != m->decls.end()) {                       \
		auto& some = iter->second.v;                    \
		if (auto decl = std::get_if<DeclType>(&some)) { \
			return decl;                                \
		}                                               \
	}                                                   \
	return nullptr

const DeclEnum* CodegenInput::FindEnum(std::string_view name) const {
	FIND_DECL_OF_TYPE(DeclEnum);
}

const DeclStruct* CodegenInput::FindStruct(std::string_view name) const {
	FIND_DECL_OF_TYPE(DeclStruct);
}

DeclNamespace* CodegenInput::AddNamespace(DeclNamespace ns) {
	auto path = Utils::MakeFullName(""sv, &ns);
	auto [iter, success] = m->namespaces.try_emplace(std::move(path), std::move(ns));
	auto& nsRef = iter->second;
	if (success) {
		nsRef.fullname = iter->first;
	}
	return &nsRef;
}

const DeclNamespace* CodegenInput::FindNamespace(std::string_view fullname) const {
	auto iter = m->namespaces.find(fullname);
	if (iter != m->namespaces.end()) {
		return &iter->second;
	} else {
		return nullptr;
	}
}

DeclNamespace* CodegenInput::FindNamespace(std::string_view name) {
	return const_cast<DeclNamespace*>(const_cast<const CodegenInput*>(this)->FindNamespace(name));
}