#include <components/LightToggle.h>

#include <destrum/Components/LightComponent.h>
#include <destrum/Components/MeshRendererComponent.h>
#include <destrum/Graphics/Renderer.h>
#include <destrum/ObjectModel/GameObject.h>
#include <destrum/Util/GameState.h>

#include <imgui.h>

LightToggle::LightToggle(GameObject& parent)
    : Activatable(parent, "LightToggle")
{
}

void LightToggle::Start()
{
    Apply();
}

void LightToggle::SetOn(bool on)
{
    m_On = on;
    Apply();
}

void LightToggle::OnActivate(GameObject&)
{
    SetOn(!m_On);
}

void LightToggle::Apply()
{
    GameObject* object = GetGameObject();
    auto* light = object->GetComponent<LightComponent>();
    if (light != nullptr) {
        light->SetEnabled(m_On);
    }

    // The bulb glows in the light's colour while it is on
    const auto* meshRenderer = object->GetComponent<MeshRendererComponent>();
    if (meshRenderer == nullptr || meshRenderer->GetMaterialID() == NULL_MATERIAL_ID ||
        !GameState::GetInstance().HasRenderer()) {
        return;
    }

    GameRenderer& renderer = GameState::GetInstance().Renderer();
    Material& material = renderer.getMaterialMutable(meshRenderer->GetMaterialID());
    material.emissiveColor = m_On && light != nullptr ? light->GetColor() : glm::vec3{0.0f};
    renderer.updateMaterialGPU(meshRenderer->GetMaterialID());
}

nlohmann::json LightToggle::Serialize() const
{
    return {{"on", m_On}};
}

void LightToggle::Deserialize(const nlohmann::json& data)
{
    m_On = data.value("on", m_On);
}

void LightToggle::ImGuiInspector()
{
    if (bool on = m_On; ImGui::Checkbox("On", &on)) {
        SetOn(on);
    }
}