#include "AnimationMap.h"
#include "EngineCore/Game.h"
#include "EngineFrame/Render/RenderManager.h"
AnimationMap::~AnimationMap()
{
}

void AnimationMap::CompleteConstruction()
{
    m_size = {800, 600};
    // 遍历自己的所持有的所有Ani 取最大的尺寸
    auto &ac = this->GetAllChildren();
    RefPtr<Node> child = ac.GetFirst();
    while (child)
    {
        Animation *anim = static_cast<Animation *>(child.Get());
        auto size = anim->GetMaxSize();
        if (size.width > m_size.width)
            m_size.width = size.width;
        if (size.height > m_size.height)
            m_size.height = size.height;
        child = child->GetNext();
    }

    SetSize(m_size);
    // 创建指定大小的纹理
    m_texture = new Texture();
    m_texture->Init(m_size);

    // 构造FBO
    glGenFramebuffers(1, &m_fbo);
    glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);
    // 将目标纹理附加到FBO的颜色附着点
    glFramebufferTexture2D(
        GL_FRAMEBUFFER,       // 帧缓冲类型
        GL_COLOR_ATTACHMENT0, // 颜色附着点（可多个，这里用第一个）
        GL_TEXTURE_2D,        // 纹理类型
        m_texture->getID(),   // 目标纹理ID
        0                     // 多级渐远纹理级别
    );
    glBindFramebuffer(GL_FRAMEBUFFER, 0); // 解绑FBO
}

void AnimationMap::AddAnimation(RefPtr<Animation> animation)
{
    this->AddChild(animation);
}

void AnimationMap::Reset()
{
    auto &ac = this->GetAllChildren();
    RefPtr<Node> child = ac.GetFirst();
    while (child)
    {
        Animation *anim = static_cast<Animation *>(child.Get());
        anim->Reset();
        child = child->GetNext();
    }
}

void AnimationMap::Render()
{
    Actor::PreRender();
    Actor::PrepareToRender();
    Actor::OnRender();
}

void AnimationMap::OnRender()
{
    RenderManager *renderer = Game::GetInstance().GetRenderer();
    renderer->DrawTexture(m_texture);
}

void AnimationMap::OnUpdate(float deltaTime)
{
    Actor::OnUpdate(deltaTime);

    RenderManager *renderer = Game::GetInstance().GetRenderer();
    // 绑定FBO
    glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);
    // 清屏
    glClear(GL_COLOR_BUFFER_BIT);
    // 保存原始的正交矩阵 设置纹理对应的正交矩阵 和 视口
    Oom = renderer->GetOrthoMatrix();
    renderer->SetOrthoMatrix(glm::ortho(0.0f, (float)m_size.width, 0.0f, (float)m_size.height, -1.0f, 1.0f));
    Oviewport = renderer->GetViewport();
    renderer->SetViewport({0, 0, m_size.width, m_size.height});
    // 以上步骤将渲染目标调整至AniMap的纹理上

    SDL_Rect buf;
    buf.x = 0;
    buf.y = 0;
    buf.w = m_size.width;
    buf.h = m_size.height;
    glm::vec4 red = {0.0f, 0.0f, 1.0f, 0.4f}; // RGBA：红色，不透明基础色
    Game::GetInstance().GetRenderer()->DrawRect(&buf, red);

    auto &ac = this->GetAllChildren();
    RefPtr<Node> child = ac.GetFirst();
    while (child)
    {
        child->Render();
        child = child->GetNext();
    }

    // 渲染完毕后，将渲染目标恢复为默认
    // 解绑FBO
    glBindFramebuffer(GL_FRAMEBUFFER, 0);
    // 恢复原始的正交矩阵 和 视口
    renderer->SetOrthoMatrix(Oom);
    renderer->SetViewport(Oviewport);

    Actor::OnUpdate(deltaTime);
}

// void AnimationMap::SetVisible(bool visible)
// {
//     if (this->IsVisible() == visible)
//         return;
//     Actor::SetVisible(visible);
//     auto ac = this->GetAllChildren();
//     RefPtr<Node> next;
//     for (RefPtr<Node> child = ac.GetFirst(); child; child = next)
//     {
//         next = child->GetNext();
//         child->SetVisible(visible);
//     }
// }

AnimationMap::AnimationMap()
{
}