#include "cve_model.hpp"

#include <cassert>
#include <cstring>

namespace cve {

    CveModel::CveModel(CveDevice &device, const std::vector<Vertex> &verticies) : cveDevice{device} {
        createVertexBuffers(verticies);
    }

    CveModel::~CveModel() {
        vkDestroyBuffer(cveDevice.device(), vertexBuffer, nullptr);
        vkFreeMemory(cveDevice.device(), vertexBufferMemory, nullptr);
    }

    void CveModel::createVertexBuffers(const std::vector<Vertex> &verticies) {
        vertexCount = static_cast<uint32_t>(verticies.size());
        assert(vertexCount >= 3 && "Vertex count must be at least 3");
        VkDeviceSize bufferSize = sizeof(verticies[0]) * vertexCount;
        cveDevice.createBuffer(
            bufferSize,
            VK_BUFFER_USAGE_VERTEX_BUFFER_BIT,
            VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
            vertexBuffer,
            vertexBufferMemory
        );

        void *data;
        vkMapMemory(cveDevice.device(), vertexBufferMemory, 0, bufferSize, 0, &data);
        memcpy(data, verticies.data(), static_cast<size_t>(bufferSize));
        vkUnmapMemory(cveDevice.device(), vertexBufferMemory);
    }

    void CveModel::draw(VkCommandBuffer commandBuffer) {
        vkCmdDraw(commandBuffer, vertexCount, 1, 0, 0);
    }

    void CveModel::bind(VkCommandBuffer commandBuffer) {
        VkBuffer buffers[] = {vertexBuffer};
        VkDeviceSize offsets[] = {0};
        vkCmdBindVertexBuffers(commandBuffer, 0, 1, buffers, offsets);
    }

    std::vector<VkVertexInputBindingDescription> CveModel::Vertex::getBindingDescriptions() {
        std::vector<VkVertexInputBindingDescription> bindingDescriptions(1);
        bindingDescriptions[0].binding = 0;
        bindingDescriptions[0].stride = sizeof(Vertex);
        bindingDescriptions[0].inputRate = VK_VERTEX_INPUT_RATE_VERTEX;
        return bindingDescriptions;
    }

    std::vector<VkVertexInputAttributeDescription> CveModel::Vertex::getAttributeDescriptions() {
        std::vector<VkVertexInputAttributeDescription> attributeDescriptions(1);
        attributeDescriptions[0].binding = 0;
        attributeDescriptions[0].location = 0;
        attributeDescriptions[0].format = VK_FORMAT_R32G32_SFLOAT;
        attributeDescriptions[0].offset = 0;

        return attributeDescriptions;
    }
}