// Copyright (c) 2024 Dominic Masters
// 
// This software is released under the MIT License.
// https://opensource.org/licenses/MIT

#include "RPGPlayer.hpp"
#include "scene/Scene.hpp"
#include "assert/assert.hpp"

using namespace Dawn;

void RPGPlayer::onInit() {
  rpgEntity = getItem()->getComponent<RPGEntity>();
  assertNotNull(rpgEntity, "RPGPlayer requires an RPGEntity component!");

  events.push_back(getScene()->onUnpausedUpdate.listen([&](
    float_t d
  ) {
    glm::vec2 movement = getGame()->inputManager.getAxis2D(
      InputBind::LEFT, InputBind::RIGHT,
      InputBind::UP, InputBind::DOWN
    );

    if(movement.x != 0 || movement.y != 0) {
      enum RPGEntityDirection dir = rpgEntity->getFacingDirection();
      if(movement.x > 0) {
        if(
          movement.y == 0 ||
          (movement.y < 0 && dir == RPGEntityDirection::SOUTH) ||
          (movement.y > 0 && dir == RPGEntityDirection::NORTH)
        ) {
          rpgEntity->setFacingDirection(RPGEntityDirection::EAST);
        }
      } else if(movement.x < 0) {
        if(
          movement.y == 0 ||
          (movement.y < 0 && dir == RPGEntityDirection::SOUTH) ||
          (movement.y > 0 && dir == RPGEntityDirection::NORTH)
        ) {
          rpgEntity->setFacingDirection(RPGEntityDirection::WEST);
        }
      } else if(movement.y > 0) {
        rpgEntity->setFacingDirection(RPGEntityDirection::SOUTH);
      } else if(movement.y < 0) {
        rpgEntity->setFacingDirection(RPGEntityDirection::NORTH);
      }

      // Normalize angle.
      float_t angle = atan2(movement.x, movement.y);
      angle -= Math::deg2rad(90.0f);
      movement = glm::vec2(cosf(angle), sinf(angle)) * PLAYER_SPEED * d;

      // Update position.
      auto ePos = getItem()->getLocalPosition();
      ePos.x += movement.x;
      ePos.y += movement.y;
      getItem()->setLocalPosition(ePos);
    }

    if(this->camera != nullptr) {
      this->camera->lookAtPixelPerfect(
        getItem()->getLocalPosition() + glm::vec3(0, -(RPG_ENTITY_SIZE*2), 0),
        getItem()->getLocalPosition(),
        2.0f
      );
    }
  }));
}

void RPGPlayer::onDispose() {
  this->rpgEntity = nullptr;
}

void RPGPlayer::load(SceneComponentLoadContext &ctx) {
  SceneComponent::load(ctx);

  if(ctx.data.contains("camera")) {
    assertMapHasKey(ctx.components, ctx.data["camera"], "Camera not found!");
    const auto component = ctx.components[ctx.data["camera"].get<std::string>()];
    this->camera = std::dynamic_pointer_cast<Camera>(component);
    assertNotNull(this->camera, "Camera not found!");
  }
}