#include "renderer_simple.hpp"

void endofthejedi::RendererSimple::drawCircle(float x, float y, float radius,
                                              float r, float g, float b,
                                              int numSides) {
    glBegin(GL_TRIANGLE_FAN);
    glVertex2f(x, y); // center of circle
    for (int i = 0; i <= numSides; i++) {
        glColor3f(r, g, b);
        glVertex2f(x + (radius * cos(i * 2 * M_PI / numSides)),
                   y + (radius * sin(i * 2 * M_PI / numSides)));
    }
    glEnd();
}

void endofthejedi::RendererSimple::drawShip(const glm::vec2 &pos,
                                            float radius) {
    // std::cout<<"draw ship @ " << pos.x << ", " << pos.y << std::endl;
    glm::vec3 color = glm::vec3(0.2, 1.0, 0.3);

    drawCircle(pos.x, pos.y, radius, color.x, color.y, color.z, 12);
}

void endofthejedi::RendererSimple::drawPlanet(const glm::vec2 &pos,
                                              float radius) {
    glm::vec3 color = glm::vec3(0.7, 0.1, 0.2);

    // std::cout<<"draw planet @ " << pos.x << ", " << pos.y << std::endl;
    drawCircle(pos.x, pos.y, radius, color.x, color.y, color.z, 32);
}

void endofthejedi::RendererSimple::drawMissile(const glm::vec2 &pos) {
    glm::vec3 color = glm::vec3(1.0, 1.0, 0.3);
    drawCircle(pos.x, pos.y, 0.01, color.x, color.y, color.z, 6);
}

void endofthejedi::RendererSimple::drawTrace(const game::Trace *trace) {
    for (const game::Trace::TracePoint &p : trace->points) {
        glm::vec3 color = glm::vec3(0.1, 0.3, 1.0) / (1.0f + 500.0f * p.speed);
        drawCircle(p.position.x, p.position.y, 0.005, color.x, color.y, color.z,
                   3);
    }
}

void endofthejedi::RendererSimple::drawExplosion(
    const game::Explosion *explosion) {
    // TODO: transparent
    // TODO: with glow in the middle
    float r = explosion->maxRadius * (explosion->age / explosion->maxAge);

    // TODO: transparency?
    glm::vec3 color = glm::vec3(1.0, 0.9, 0.1);
    drawCircle(explosion->position.x, explosion->position.y, r, color.x,
               color.y, color.z, 64);
}

void endofthejedi::RendererSimple::render(const game::State *state) {
    for (const game::Planet *planet : state->planets) {
        drawPlanet(planet->position, planet->radius);
    }

    for (const game::Trace *trace : state->traces) {
        drawTrace(trace);
    }

    for (const game::Explosion *explosion : state->explosions) {
        drawExplosion(explosion);
    }

    for (const game::Ship *ship : state->ships) {
        drawShip(ship->position, ship->radius);
    }

    for (const game::Player *player : state->players) {
        for (const game::Missile *missile : player->missiles) {
            drawMissile(missile->position);
        }
    }
}