#include "View.h"

#include <algorithm>
#include <cmath>
#include <memory>
#include <utility>

#include <raylib.h>

#include "Label.h"
#include "Source.h"


View::View(std::unique_ptr<Source> source) :
    m_camera {},
    m_source {std::move(source)},
    m_labels {},
    m_grid {0}
{
    m_camera.position = Vector3{10.0f, 10.0f, 10.0f};
    m_camera.target = Vector3{0.0f, 0.0f, 0.0f};
    m_camera.up = Vector3{0.0f, 1.0f, 0.0f};
    m_camera.fovy = 45;
    m_camera.projection = CAMERA_PERSPECTIVE;
    SetCameraMode(m_camera, CAMERA_ORBITAL);
}


void
View::update(const float dt)
{
    const auto grids = m_source->grids();
    if (IsKeyPressed(KEY_SPACE)) {
        m_grid++;
        if (m_grid >= grids.size())
            m_grid = 0;
    }
    UpdateCamera(&m_camera);
    const int height = GetScreenHeight();
    const int width = GetScreenWidth();
    const auto killmails = grids.at(m_grid).killmails;
    m_labels.clear();
    m_labels.reserve(killmails.size());
    for (const auto& km : killmails) {
        const auto pos = GetWorldToScreen(km.position, m_camera);
        const float depth =
            std::sqrt(
                std::pow(m_camera.position.x - km.position.x, 2) +
                std::pow(m_camera.position.y - km.position.y, 2) +
                std::pow(m_camera.position.z - km.position.z, 2));
        if (0 > pos.x || width < pos.x || 0 > pos.y || height < pos.y)
            continue;
        const auto base = GetWorldToScreen({km.position.x, 0.0f, km.position.z}, m_camera);
        m_labels.push_back(Label{pos, base, depth});
    }
    std::sort(m_labels.begin(), m_labels.end(), [](auto& a, auto& b){ return a.depth > b.depth; });
}


void
View::draw() const
{
    BeginDrawing();
    ClearBackground(RAYWHITE);
    BeginMode3D(m_camera);
    DrawGrid(12, 1.0f);
    EndMode3D();
    for (const auto& point : m_labels) {
        DrawLine(point.base.x, point.base.y, point.pos.x, point.pos.y, LIGHTGRAY);
        DrawCircle(point.pos.x, point.pos.y, 3, RED);
    }
    DrawFPS(5, 5);
    int y = 25;
    const int height = GetScreenHeight();
    for (const auto& point : m_labels) {
        DrawText(TextFormat("%5.1f x %5.1f x %5.1f", point.pos.x, point.pos.y, point.depth), 5, y, 10, DARKGRAY);
        y += 10;
        if (y > height)
            break;
    }
    EndDrawing();
}