#include "Scripting/ScriptComponent.h"

#include "Scripting/ScriptEngine.h"

#include <random>
#include <sstream>

namespace XCEngine {
namespace Scripting {

namespace {

uint64_t GenerateScriptComponentUUID() {
    static std::random_device rd;
    static std::mt19937_64 gen(rd());
    static std::uniform_int_distribution<uint64_t> dis(1, UINT64_MAX);
    return dis(gen);
}

} // namespace

ScriptComponent::ScriptComponent()
    : m_scriptComponentUUID(GenerateScriptComponentUUID()) {
}

void ScriptComponent::SetScriptClass(const std::string& namespaceName, const std::string& className) {
    const bool hadScriptClass = HasScriptClass();
    m_namespaceName = namespaceName;
    m_className = className;
    if (!hadScriptClass && HasScriptClass()) {
        ScriptEngine::Get().OnScriptComponentEnabled(this);
    }
}

void ScriptComponent::SetScriptClass(const std::string& assemblyName, const std::string& namespaceName, const std::string& className) {
    const bool hadScriptClass = HasScriptClass();
    m_assemblyName = assemblyName;
    m_namespaceName = namespaceName;
    m_className = className;
    if (!hadScriptClass && HasScriptClass()) {
        ScriptEngine::Get().OnScriptComponentEnabled(this);
    }
}

std::string ScriptComponent::GetFullClassName() const {
    if (m_className.empty()) {
        return std::string();
    }

    if (m_namespaceName.empty()) {
        return m_className;
    }

    return m_namespaceName + "." + m_className;
}

void ScriptComponent::OnEnable() {
    ScriptEngine::Get().OnScriptComponentEnabled(this);
}

void ScriptComponent::OnDisable() {
    ScriptEngine::Get().OnScriptComponentDisabled(this);
}

void ScriptComponent::OnDestroy() {
    ScriptEngine::Get().OnScriptComponentDestroyed(this);
}

void ScriptComponent::Serialize(std::ostream& os) const {
    os << "scriptComponentUUID=" << m_scriptComponentUUID << ";";
    os << "assembly=" << EscapeScriptString(m_assemblyName) << ";";
    os << "namespace=" << EscapeScriptString(m_namespaceName) << ";";
    os << "class=" << EscapeScriptString(m_className) << ";";
    os << "fields=" << EscapeScriptString(m_fieldStorage.SerializeToString()) << ";";
}

void ScriptComponent::Deserialize(std::istream& is) {
    std::ostringstream buffer;
    buffer << is.rdbuf();

    std::istringstream input(buffer.str());
    std::string token;
    while (std::getline(input, token, ';')) {
        if (token.empty()) {
            continue;
        }

        const size_t eqPos = token.find('=');
        if (eqPos == std::string::npos) {
            continue;
        }

        const std::string key = token.substr(0, eqPos);
        const std::string value = token.substr(eqPos + 1);

        if (key == "scriptComponentUUID") {
            m_scriptComponentUUID = static_cast<uint64_t>(std::stoull(value));
        } else if (key == "assembly") {
            m_assemblyName = UnescapeScriptString(value);
        } else if (key == "namespace") {
            m_namespaceName = UnescapeScriptString(value);
        } else if (key == "class") {
            m_className = UnescapeScriptString(value);
        } else if (key == "fields") {
            m_fieldStorage.DeserializeFromString(UnescapeScriptString(value));
        }
    }
}

} // namespace Scripting
} // namespace XCEngine