#include "ArcGenerator.h"

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

#include <raylib.h>

#include "ConstantVelocity.h"


ArcGenerator::ArcGenerator(std::shared_ptr<Vector2> position, ConstantVelocityBullet::Vector& bullets) :
    m_position {position},
    m_bullets {bullets},
    m_delay {0},
    m_interval {0.22f},
    m_arc {2.f},
    m_angle {0},
    m_rotation {0},
    m_radius {3},
    m_last {false},
    m_speed {80},
    m_shift {10},
    m_segments {30},
    m_color {100, 100, 240, 255}
{
}


void
ArcGenerator::update(const float dt)
{
    if (!m_enabled)
        return;
    m_delay += dt;
    m_angle += m_rotation * dt;
    const int segments = m_last ? m_segments + 1 : m_segments;
    if (m_delay > m_interval) {
        m_delay -= m_interval;
        for (float i = 0; i < segments; ++i) {
            const float angle = (m_angle - m_arc / 2 + m_arc * i / m_segments) * M_PI;
            const float cos = std::cos(angle);
            const float sin = std::sin(angle);
            ConstantVelocityBullet bullet;
            bullet.color = m_color;
            bullet.radius = m_radius;
            bullet.velocity.x = cos * m_speed;
            bullet.velocity.y = sin * m_speed;
            bullet.position.x = m_position->x + cos * m_shift;
            bullet.position.y = m_position->y + sin * m_shift;
            m_bullets.push_back(std::move(bullet));
        }
    }
}