import { HttpException, HttpStatus } from '@nestjs/common';

export type EquipmentErrorCode =
  | 'CHARACTER_ITEM_NOT_FOUND'
  | 'ITEM_NOT_OWNED'
  | 'ITEM_NOT_EQUIPPABLE'
  | 'ITEM_LEVEL_REQUIREMENT_NOT_MET'
  | 'INVALID_EQUIPMENT_SLOT'
  | 'CHARACTER_IN_COMBAT';

export class EquipmentDomainError extends HttpException {
  constructor(
    public readonly code: EquipmentErrorCode,
    status: HttpStatus,
    message: string,
  ) {
    super({ statusCode: status, code, message }, status);
  }
}

export function characterItemNotFound(): EquipmentDomainError {
  return new EquipmentDomainError(
    'CHARACTER_ITEM_NOT_FOUND',
    HttpStatus.NOT_FOUND,
    'This item could not be found.',
  );
}

export function itemNotOwned(): EquipmentDomainError {
  return new EquipmentDomainError(
    'ITEM_NOT_OWNED',
    HttpStatus.FORBIDDEN,
    'This item does not belong to the character.',
  );
}

export function itemNotEquippable(): EquipmentDomainError {
  return new EquipmentDomainError(
    'ITEM_NOT_EQUIPPABLE',
    HttpStatus.BAD_REQUEST,
    'This item cannot be equipped.',
  );
}

export function itemLevelRequirementNotMet(): EquipmentDomainError {
  return new EquipmentDomainError(
    'ITEM_LEVEL_REQUIREMENT_NOT_MET',
    HttpStatus.BAD_REQUEST,
    "The character does not meet this item's level requirement.",
  );
}

// Defensive: slot is always derived from the item definition server-side, so
// this is unreachable in practice (spec §27 still names it explicitly).
export function invalidEquipmentSlot(): EquipmentDomainError {
  return new EquipmentDomainError(
    'INVALID_EQUIPMENT_SLOT',
    HttpStatus.BAD_REQUEST,
    'This item does not target a valid equipment slot.',
  );
}

export function characterInCombat(): EquipmentDomainError {
  return new EquipmentDomainError(
    'CHARACTER_IN_COMBAT',
    HttpStatus.CONFLICT,
    'Equipment cannot be changed during an active combat.',
  );
}

export { characterNotFound } from '../travel/travel.errors';