/**
 * Copyright (c) 2025 Dominic Masters
 * 
 * This software is released under the MIT License.
 * https://opensource.org/licenses/MIT
 */

#include "entity.h"
#include "assert/assert.h"
#include "input/input.h"
#include "display/scene/overworld/sceneoverworld.h"
#include "display/tileset/tileset_entities.h"

void playerInit(entity_t *entity) {
  assertNotNull(entity, "Entity pointer cannot be NULL");
}

void playerMovement(entity_t *entity) {
  assertNotNull(entity, "Entity pointer cannot be NULL");

  // Update velocity.
  vec2 dir = {
    inputAxis(INPUT_ACTION_LEFT, INPUT_ACTION_RIGHT),
    inputAxis(INPUT_ACTION_DOWN, INPUT_ACTION_UP)
  };
  if(dir[0] == 0 && dir[1] == 0) return;

  glm_vec2_normalize(dir);
  entity->velocity[0] += PLAYER_SPEED * dir[0];
  entity->velocity[1] += PLAYER_SPEED * dir[1];
  
  // Update direction.
  if(dir[0] > 0) {
    if(entity->direction == DIRECTION_RIGHT) {
      entity->direction = DIRECTION_RIGHT;
    } else {
      if(dir[1] < 0) {
        entity->direction = DIRECTION_UP;
      } else if(dir[1] > 0) {
        entity->direction = DIRECTION_DOWN;
      } else {
        entity->direction = DIRECTION_RIGHT;
      }
    }
  } else if(dir[0] < 0) {
    if(entity->direction == DIRECTION_LEFT) {
      entity->direction = DIRECTION_LEFT;
    } else {
      if(dir[1] < 0) {
        entity->direction = DIRECTION_UP;
      } else if(dir[1] > 0) {
        entity->direction = DIRECTION_DOWN;
      } else {
        entity->direction = DIRECTION_LEFT;
      }
    }
  } else if(dir[1] < 0) {
    entity->direction = DIRECTION_UP;
  } else if(dir[1] > 0) {
    entity->direction = DIRECTION_DOWN;
  }
}

void playerInteraction(entity_t *entity) {
  assertNotNull(entity, "Entity pointer cannot be NULL");

  if(!inputPressed(INPUT_ACTION_ACCEPT)) return;
  
  physicsbox_t interactBox;

  // Get direction vector
  directionGetVec2(entity->direction, interactBox.min);

  // Scale by interact range
  glm_vec2_scale(interactBox.min, PLAYER_INTERACTION_RANGE, interactBox.min);

  // Add entity position, this makes the center of the box.
  glm_vec2_add(interactBox.min, entity->position, interactBox.min);

  // Copy to max
  glm_vec2_copy(interactBox.min, interactBox.max);
  
  // Size of the hitbox
  vec2 halfSize = {
    TILESET_ENTITIES.tileWidth * PLAYER_INTERACTION_SIZE * 0.5f,
    TILESET_ENTITIES.tileHeight * PLAYER_INTERACTION_SIZE * 0.5f
  };

  // Subtract from min, add to max.
  glm_vec2_sub(interactBox.min, halfSize, interactBox.min);
  glm_vec2_add(interactBox.max, halfSize, interactBox.max);

  // For each entity
  entity_t *start = entity->map->entities;
  entity_t *end = &entity->map->entities[entity->map->entityCount];
  vec2 otherSize = { TILESET_ENTITIES.tileWidth, TILESET_ENTITIES.tileHeight };
  physicsbox_t otherBox;
  physicsboxboxresult_t result;

  do {
    if(start->type != ENTITY_TYPE_NPC) continue;

    // Setup other box.
    glm_vec2_copy(start->position, otherBox.min);
    glm_vec2_copy(start->position, otherBox.max);
    glm_vec2_sub(otherBox.min, otherSize, otherBox.min);
    glm_vec2_add(otherBox.min, otherSize, otherBox.max);
    
    physicsBoxCheckBox(interactBox, otherBox, &result);
    if(!result.hit) continue;
    
    printf("Interacted with entity at (%.2f, %.2f)\n", start->position[0], start->position[1]);
    break;
  } while(++start != end);
}