#pragma once
#include "rtt.h"
#include "texture.h"
#include "shader.h"
#include "shape.h"

NS_START

class Brush
{
public:
    std::string m_name;
    int id;
    uint16_t m_texture_id;
};

class Stroke
{
public:
    struct Keypoint
    {
        glm::vec2 pos;
        float pressure;
    };
    int m_layer;
    float m_dist;
    std::shared_ptr<Brush> m_brush;
    std::vector<Keypoint> m_keypoints;
    void add_point(glm::vec2 pos, float pressure)
    {
        m_keypoints.emplace_back();
        m_keypoints.back().pos = pos;
        m_keypoints.back().pressure = pressure;
    }
};

class Layer
{
public:
    RTT m_rtt;
    bool m_visible = true;
    bool m_locked = false;
    float m_alpha = 1.f;
    std::string m_name;
    bool create(int width, int height, std::string name)
    {
        m_rtt.create(width, height);
        return true;
    }
};

class Canvas
{
public:
    int m_width;
    int m_height;
    std::vector<Layer> m_layers;
    std::vector<Stroke> m_strokes;
    std::unique_ptr<Layer> m_tmp;
    Stroke* m_current_stroke = nullptr;
    int m_current_layer_idx = 0;
    RTT m_fb;
    Sampler m_sampler;
    Plane m_plane;
    bool create(int width, int height) 
    {
        m_width = width;
        m_height = height;
        m_tmp = std::make_unique<Layer>();
        m_tmp->create(width, height, "tmp");
        m_fb.create(width, height);
        m_sampler.create();
        m_plane.create<1>(1, 1);
        return true;
    }
    void layer_add(std::string name)
    {
        m_layers.emplace_back();
        m_layers.back().create(m_width, m_height, name);
    }
    void stroke_start(glm::vec2 point, float pressure, std::shared_ptr<Brush> brush)
    {
        m_strokes.emplace_back();
        m_strokes.back().m_brush = brush;
        m_strokes.back().add_point(point, pressure);
        m_current_stroke = &m_strokes.back();
    }
    void stroke_update(glm::vec2 point, float pressure)
    {
        m_current_stroke->add_point(point, pressure);

        m_fb.bindFramebuffer();

        GLint vp[4];
        GLfloat cc[4];
        glGetIntegerv(GL_VIEWPORT, vp);
        glGetFloatv(GL_COLOR_CLEAR_VALUE, cc);

        glViewport(0, 0, m_width, m_height);

        auto mvp = glm::ortho(0.f, (float)m_width, (float)m_height, 0.f, -1.f, 1.f) *
            glm::translate(glm::vec3(point, 0)) *
            glm::scale(glm::vec3(30, 30, 1));

        auto& tex = TextureManager::get(m_current_stroke->m_brush->m_texture_id);
        tex.bind();
        m_sampler.bind(0);
        ui::ShaderManager::use(kShader::Texture);
        ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
        ui::ShaderManager::u_mat4(kShaderUniform::MVP, mvp);
        m_plane.draw_fill();
        m_sampler.unbind();
        tex.unbind();


        glViewport(vp[0], vp[1], vp[2], vp[3]);
        glClearColor(cc[0], cc[1], cc[2], cc[3]);

        m_fb.unbindFramebuffer();
    }
    void stroke_end()
    {
        m_current_stroke = nullptr;
    }
    void clear()
    {
        m_fb.bindFramebuffer();

        GLint vp[4];
        GLfloat cc[4];
        glGetIntegerv(GL_VIEWPORT, vp);
        glGetFloatv(GL_COLOR_CLEAR_VALUE, cc);

        glClearColor(1, 1, 1, 1);
        glClear(GL_COLOR_BUFFER_BIT);
        glViewport(0, 0, m_width, m_height);

        //

        glViewport(vp[0], vp[1], vp[2], vp[3]);
        glClearColor(cc[0], cc[1], cc[2], cc[3]);

        m_fb.unbindFramebuffer();
    }
};

NS_END