Extra2D/Extra2D/include/extra2d/node/node.h

#pragma once

#include <extra2d/core/types.h>
#include <extra2d/core/math_types.h>
#include <extra2d/core/math_extended.h>
#include <algorithm>
#include <vector>
#include <memory>
#include <functional>

namespace extra2d {

class Node;
class Comp;
class Act;

namespace Anchor {
    constexpr Vec2 BottomLeft  = Vec2(0.0f, 0.0f);
    constexpr Vec2 Bottom      = Vec2(0.5f, 0.0f);
    constexpr Vec2 BottomRight = Vec2(1.0f, 0.0f);
    constexpr Vec2 Left        = Vec2(0.0f, 0.5f);
    constexpr Vec2 Center      = Vec2(0.5f, 0.5f);
    constexpr Vec2 Right       = Vec2(1.0f, 0.5f);
    constexpr Vec2 TopLeft     = Vec2(0.0f, 1.0f);
    constexpr Vec2 Top         = Vec2(0.5f, 1.0f);
    constexpr Vec2 TopRight    = Vec2(1.0f, 1.0f);
}

class Comp {
public:
    virtual ~Comp() = default;

    virtual const char* type() const = 0;

    virtual void onAttach(Node* o) { owner_ = o; }
    virtual void onDetach() { owner_ = nullptr; }
    virtual void onEnable() {}
    virtual void onDisable() {}

    virtual void update(f32 dt) {}
    virtual void lateUpdate(f32 dt) {}

    Node* owner() const { return owner_; }

    bool enabled() const { return enabled_; }
    void setEnabled(bool e);

protected:
    Node* owner_ = nullptr;
    bool enabled_ = true;
};

class Node : public std::enable_shared_from_this<Node> {
    friend class SceneGraph;
public:
    virtual ~Node();

    Vec2 pos = Vec2(0, 0);
    Vec2 scale = Vec2(1, 1);
    f32 rot = 0.0f;
    Vec2 anchor = Vec2(0.5f, 0.5f);

    void setAnchor(f32 x, f32 y) { anchor = Vec2(x, y); }
    void setAnchor(const Vec2& a) { anchor = a; }

    void setPos(f32 x, f32 y) { pos = Vec2(x, y); }
    void setPos(const Vec2& p) { pos = p; }

    void setScale(f32 x, f32 y) { scale = Vec2(x, y); }
    void setScale(const Vec2& s) { scale = s; }
    void setScale(f32 s) { scale = Vec2(s, s); }

    void setRot(f32 r) { rot = r; }

    Mat3 local() const;
    Mat3 world() const;
    Mat4 world4x4() const;

    Vec2 worldPos() const;
    f32 worldRot() const;
    Vec2 worldScale() const;

    template<typename T, typename... Args>
    T* add(Args&&... args) {
        auto c = std::make_unique<T>(std::forward<Args>(args)...);
        T* p = c.get();
        addInternal(std::move(c));
        return p;
    }

    template<typename T>
    T* get() {
        for (auto& c : comps_) {
            if (auto* p = dynamic_cast<T*>(c.get())) {
                return p;
            }
        }
        return nullptr;
    }

    template<typename T>
    const T* get() const {
        for (auto& c : comps_) {
            if (auto* p = dynamic_cast<const T*>(c.get())) {
                return p;
            }
        }
        return nullptr;
    }

    template<typename T>
    void remove() {
        comps_.erase(
            std::remove_if(comps_.begin(), comps_.end(),
                [](const auto& c) { return dynamic_cast<T*>(c.get()) != nullptr; }),
            comps_.end()
        );
    }

    void updateComps(f32 dt);
    void lateUpdateComps(f32 dt);

    void addChild(Ref<Node> child);
    void removeChild(Ref<Node> child);
    void removeFromParent();
    Node* parent() const { return parent_; }
    const std::vector<Ref<Node>>& children() const { return children_; }

    virtual void onInit() {}
    virtual void onUpdate(f32 dt) {}
    virtual void onRender() {}

    const std::string& name() const { return name_; }
    void setName(const std::string& n) { name_ = n; }

    bool visible() const { return visible_; }
    void setVisible(bool v) { visible_ = v; }

    i32 tag() const { return tag_; }
    void setTag(i32 t) { tag_ = t; }

    Act* run(Act* a);
    void stop(Act* a);
    void stopByTag(i32 tag);
    void stopAll();

    Act* getActByTag(i32 tag);
    i32 runningActs() const;

    void updateActs(f32 dt);

protected:
    virtual Vec2 defaultAnchor() const { return Vec2(0.5f, 0.5f); }
    std::vector<Unique<Comp>> comps_;
    Node* parent_ = nullptr;
    std::vector<Ref<Node>> children_;
    std::string name_;
    bool visible_ = true;
    i32 tag_ = 0;
    std::vector<Act*> acts_;

    void addInternal(Unique<Comp> c);
};

inline void Comp::setEnabled(bool e) {
    if (enabled_ != e) {
        enabled_ = e;
        if (enabled_) {
            onEnable();
        } else {
            onDisable();
        }
    }
}

}