import { System } from '../core/System.js';
import { SystemName, ComponentType } from '../core/Constants.js';

export class PlayerControllerSystem extends System {
  constructor() {
    super(SystemName.PLAYER_CONTROLLER);
    this.requiredComponents = [ComponentType.POSITION, ComponentType.VELOCITY];
    this.priority = 5;
    this.playerEntity = null;
  }

  process(deltaTime, entities) {
    // Find player entity (entity with Evolution component)
    if (!this.playerEntity) {
      this.playerEntity = entities.find(e => e.hasComponent(ComponentType.EVOLUTION));
    }

    if (!this.playerEntity) return;

    const inputSystem = this.engine.systems.find(s => s.name === SystemName.INPUT);
    if (!inputSystem) return;

    const velocity = this.playerEntity.getComponent(ComponentType.VELOCITY);
    const position = this.playerEntity.getComponent(ComponentType.POSITION);
    if (!velocity || !position) return;

    // Movement input
    let moveX = 0;
    let moveY = 0;
    const moveSpeed = 100; // Scaled down for 320x240

    if (inputSystem.isKeyPressed('w') || inputSystem.isKeyPressed('arrowup')) {
      moveY -= 1;
    }
    if (inputSystem.isKeyPressed('s') || inputSystem.isKeyPressed('arrowdown')) {
      moveY += 1;
    }
    if (inputSystem.isKeyPressed('a') || inputSystem.isKeyPressed('arrowleft')) {
      moveX -= 1;
    }
    if (inputSystem.isKeyPressed('d') || inputSystem.isKeyPressed('arrowright')) {
      moveX += 1;
    }

    // Normalize diagonal movement
    if (moveX !== 0 && moveY !== 0) {
      moveX *= 0.707;
      moveY *= 0.707;
    }

    // Apply movement
    velocity.vx = moveX * moveSpeed;
    velocity.vy = moveY * moveSpeed;

    // Face mouse or movement direction
    const mouse = inputSystem.getMousePosition();
    const dx = mouse.x - position.x;
    const dy = mouse.y - position.y;
    if (Math.abs(dx) > 0.1 || Math.abs(dy) > 0.1) {
      position.rotation = Math.atan2(dy, dx);
    } else if (moveX !== 0 || moveY !== 0) {
      position.rotation = Math.atan2(moveY, moveX);
    }
  }

  getPlayerEntity() {
    return this.playerEntity;
  }
}