import { Direction, MOVE_SPEED, type Movement, type Position, type SocialState } from '@dflike/shared';
import type { World } from '../ecs/World.js';
import type { GatheringState } from './gatheringSystem.js';

function directionFromDelta(dx: number, dy: number): number {
  if (Math.abs(dx) > Math.abs(dy)) return dx > 0 ? Direction.RIGHT : Direction.LEFT;
  return dy > 0 ? Direction.DOWN : Direction.UP;
}

export function movementSystem(world: World): void {
  for (const entity of world.query('position', 'movement')) {
    const movement = world.getComponent<Movement>(entity, 'movement')!;
    const pos = world.getComponent<Position>(entity, 'position')!;

    const socialState = world.getComponent<SocialState>(entity, 'socialState');
    if (socialState && socialState.phase !== 'none') continue;

    const gatheringState = world.getComponent<GatheringState>(entity, 'gatheringState');
    if (gatheringState) continue;

    if (movement.state !== 'walking' || movement.path.length === 0) {
      if (movement.state === 'walking' && movement.path.length === 0) {
        movement.state = 'idle';
        movement.target = null;
        movement.moveProgress = 0;
      }
      continue;
    }

    movement.moveProgress += MOVE_SPEED;

    if (movement.moveProgress >= 1) {
      movement.moveProgress -= 1;
      const next = movement.path.shift()!;
      movement.direction = directionFromDelta(next.x - pos.x, next.y - pos.y);
      pos.x = next.x;
      pos.y = next.y;

      if (movement.path.length === 0) {
        movement.state = 'idle';
        movement.target = null;
        movement.moveProgress = 0;
      }
    }
  }
}