#include "Camera.hpp"

#include "AppConfig.hpp"

#include <glm/gtc/matrix_transform.hpp>

Camera::Camera()
	: eye(0.0f, 0.0f, 0.0f)
	, target(0.0, 0.0f, -1.0f)
	, perspective{ false } {
}

void Camera::SetEyePos(glm::vec3 pos) {
	auto lookVector = this->target - /*Old pos*/ this->eye;
	this->eye = pos;
	this->target = pos + lookVector;
}

void Camera::SetTargetPos(glm::vec3 pos) {
	this->target = pos;
}

void Camera::SetTargetDirection(glm::vec3 lookVector) {
	this->target = this->eye + lookVector;
}

void Camera::SetHasPerspective(bool perspective) {
	this->perspective = perspective;
}

glm::mat4 Camera::CalcViewMatrix() const {
	return glm::lookAt(eye, target, glm::vec3(0, 1, 0));
}

glm::mat4 Camera::CalcProjectionMatrix() const {
	if (perspective) {
		return glm::perspective(90.0f, AppConfig::mainWindowAspectRatio, 0.1f, 1000.0f);
	} else {
		return glm::ortho(
			eye.x - AppConfig::mainWidnowWidth / 2,
			eye.x + AppConfig::mainWidnowWidth / 2,
			eye.y - AppConfig::mainWindowHeight / 2,
			eye.y + AppConfig::mainWindowHeight / 2);
	}
}