#include "OneSixVersionFormat.h"
#include <Json.h>
#include "minecraft/ParseUtils.h"
#include <minecraft/VersionBuildError.h>
#include <minecraft/MojangVersionFormat.h>

using namespace Json;

static void readString(const QJsonObject &root, const QString &key, QString &variable)
{
	if (root.contains(key))
	{
		variable = requireString(root.value(key));
	}
}

LibraryPtr OneSixVersionFormat::libraryFromJson(const QJsonObject &libObj, const QString &filename)
{
	LibraryPtr out = MojangVersionFormat::libraryFromJson(libObj, filename);
	readString(libObj, "MMC-hint", out->m_hint);
	readString(libObj, "MMC-absulute_url", out->m_absoluteURL);
	readString(libObj, "MMC-absoluteUrl", out->m_absoluteURL);
	return out;
}

QJsonObject OneSixVersionFormat::libraryToJson(Library *library)
{
	QJsonObject libRoot = MojangVersionFormat::libraryToJson(library);
	if (library->m_absoluteURL.size())
		libRoot.insert("MMC-absoluteUrl", library->m_absoluteURL);
	if (library->m_hint.size())
		libRoot.insert("MMC-hint", library->m_hint);
	return libRoot;
}

VersionFilePtr OneSixVersionFormat::versionFileFromJson(const QJsonDocument &doc, const QString &filename, const bool requireOrder)
{
	VersionFilePtr out(new VersionFile());
	if (doc.isEmpty() || doc.isNull())
	{
		throw JSONValidationError(filename + " is empty or null");
	}
	if (!doc.isObject())
	{
		throw JSONValidationError(filename + " is not an object");
	}

	QJsonObject root = doc.object();

	if (requireOrder)
	{
		if (root.contains("order"))
		{
			out->order = requireInteger(root.value("order"));
		}
		else
		{
			// FIXME: evaluate if we don't want to throw exceptions here instead
			qCritical() << filename << "doesn't contain an order field";
		}
	}

	out->name = root.value("name").toString();

	if(root.contains("uid"))
	{
		out->uid = root.value("uid").toString();
	}
	else
	{
		out->uid = root.value("fileId").toString();
	}

	out->version = root.value("version").toString();
	out->dependsOnMinecraftVersion = root.value("mcVersion").toString();
	// out->filename = filename;

	MojangVersionFormat::readVersionProperties(root, out.get());

	// added for legacy Minecraft window embedding, TODO: remove
	readString(root, "appletClass", out->appletClass);

	if (root.contains("+tweakers"))
	{
		for (auto tweakerVal : requireArray(root.value("+tweakers")))
		{
			out->addTweakers.append(requireString(tweakerVal));
		}
	}

	if (root.contains("+traits"))
	{
		for (auto tweakerVal : requireArray(root.value("+traits")))
		{
			out->traits.insert(requireString(tweakerVal));
		}
	}

	if (root.contains("+jarMods"))
	{
		for (auto libVal : requireArray(root.value("+jarMods")))
		{
			QJsonObject libObj = requireObject(libVal);
			// parse the jarmod
			auto lib = OneSixVersionFormat::jarModFromJson(libObj, filename, out->name);
			// and add to jar mods
			out->jarMods.append(lib);
		}
	}

	auto readLibs = [&](const char * which)
	{
		for (auto libVal : requireArray(root.value(which)))
		{
			QJsonObject libObj = requireObject(libVal);
			// parse the library
			auto lib = libraryFromJson(libObj, filename);
			out->libraries.append(lib);
		}
	};
	bool hasPlusLibs = root.contains("+libraries");
	bool hasLibs = root.contains("libraries");
	if (hasPlusLibs && hasLibs)
	{
		out->addProblem(ProblemSeverity::Warning,
						QObject::tr("Version file has both '+libraries' and 'libraries'. This is no longer supported."));
		readLibs("libraries");
		readLibs("+libraries");
	}
	else if (hasLibs)
	{
		readLibs("libraries");
	}
	else if(hasPlusLibs)
	{
		readLibs("+libraries");
	}

	// if we have mainJar, just use it
	if(root.contains("mainJar"))
	{
		QJsonObject libObj = requireObject(root, "mainJar");
		out->mainJar = libraryFromJson(libObj, filename);
	}
	// else reconstruct it from downloads and id ... if that's available
	else if(!out->minecraftVersion.isEmpty())
	{
		auto lib = std::make_shared<Library>();
		lib->setRawName(GradleSpecifier(QString("com.mojang:minecraft:%1:client").arg(out->minecraftVersion)));
		// we have a reliable client download, use it.
		if(out->mojangDownloads.contains("client"))
		{
			auto LibDLInfo = std::make_shared<MojangLibraryDownloadInfo>();
			LibDLInfo->artifact = out->mojangDownloads["client"];
			lib->setMojangDownloadInfo(LibDLInfo);
		}
		// we got nothing... guess based on ancient hardcoded Mojang behaviour
		// FIXME: this will eventually break...
		else
		{
			lib->setAbsoluteUrl(URLConstants::getLegacyJarUrl(out->minecraftVersion));
		}
	}

	/* removed features that shouldn't be used */
	if (root.contains("tweakers"))
	{
		out->addProblem(ProblemSeverity::Error, QObject::tr("Version file contains unsupported element 'tweakers'"));
	}
	if (root.contains("-libraries"))
	{
		out->addProblem(ProblemSeverity::Error, QObject::tr("Version file contains unsupported element '-libraries'"));
	}
	if (root.contains("-tweakers"))
	{
		out->addProblem(ProblemSeverity::Error, QObject::tr("Version file contains unsupported element '-tweakers'"));
	}
	if (root.contains("-minecraftArguments"))
	{
		out->addProblem(ProblemSeverity::Error, QObject::tr("Version file contains unsupported element '-minecraftArguments'"));
	}
	if (root.contains("+minecraftArguments"))
	{
		out->addProblem(ProblemSeverity::Error, QObject::tr("Version file contains unsupported element '+minecraftArguments'"));
	}
	return out;
}

QJsonDocument OneSixVersionFormat::versionFileToJson(const VersionFilePtr &patch, bool saveOrder)
{
	QJsonObject root;
	if (saveOrder)
	{
		root.insert("order", patch->order);
	}
	writeString(root, "name", patch->name);

	writeString(root, "uid", patch->uid);
	writeString(root, "fileId", patch->uid);

	writeString(root, "version", patch->version);
	writeString(root, "mcVersion", patch->dependsOnMinecraftVersion);

	MojangVersionFormat::writeVersionProperties(patch.get(), root);

	writeString(root, "appletClass", patch->appletClass);
	writeStringList(root, "+tweakers", patch->addTweakers);
	writeStringList(root, "+traits", patch->traits.toList());
	if (!patch->libraries.isEmpty())
	{
		QJsonArray array;
		for (auto value: patch->libraries)
		{
			array.append(OneSixVersionFormat::libraryToJson(value.get()));
		}
		root.insert("+libraries", array);
	}
	if (!patch->jarMods.isEmpty())
	{
		QJsonArray array;
		for (auto value: patch->jarMods)
		{
			array.append(OneSixVersionFormat::jarModtoJson(value.get()));
		}
		root.insert("+jarMods", array);
	}
	// write the contents to a json document.
	{
		QJsonDocument out;
		out.setObject(root);
		return out;
	}
}

JarmodPtr OneSixVersionFormat::jarModFromJson(const QJsonObject &libObj, const QString &filename, const QString &originalName)
{
	JarmodPtr out(new Jarmod());
	if (!libObj.contains("name"))
	{
		throw JSONValidationError(filename +
								  "contains a jarmod that doesn't have a 'name' field");
	}
	out->name = libObj.value("name").toString();
	out->originalName = libObj.value("originalName").toString();
	if(out->originalName.isEmpty())
	{
		auto fixed = originalName;
		fixed.remove(" (jar mod)");
		out->originalName = originalName;
	}
	return out;
}

QJsonObject OneSixVersionFormat::jarModtoJson(Jarmod *jarmod)
{
	QJsonObject out;
	writeString(out, "name", jarmod->name);
	if(!jarmod->originalName.isEmpty())
	{
		writeString(out, "originalName", jarmod->originalName);
	}
	return out;
}