/**
 * Domain Entity: LiveryTemplate
 *
 * Represents an admin-defined livery template for a specific car.
 * Contains base image and sponsor decal placements.
 */
import { RacingDomainValidationError, RacingDomainInvariantError, RacingDomainError } from '../errors/RacingDomainError';
import type { IEntity } from '@gridpilot/shared/domain';

import type { LiveryDecal } from '../value-objects/LiveryDecal';

export interface LiveryTemplateProps {
  id: string;
  leagueId: string;
  seasonId: string;
  carId: string;
  baseImageUrl: string;
  adminDecals: LiveryDecal[];
  createdAt: Date;
  updatedAt: Date | undefined;
}

export class LiveryTemplate implements IEntity<string> {
  readonly id: string;
  readonly leagueId: string;
  readonly seasonId: string;
  readonly carId: string;
  readonly baseImageUrl: string;
  readonly adminDecals: LiveryDecal[];
  readonly createdAt: Date;
  readonly updatedAt: Date | undefined;

  private constructor(props: LiveryTemplateProps) {
    this.id = props.id;
    this.leagueId = props.leagueId;
    this.seasonId = props.seasonId;
    this.carId = props.carId;
    this.baseImageUrl = props.baseImageUrl;
    this.adminDecals = props.adminDecals;
    this.createdAt = props.createdAt ?? new Date();
    this.updatedAt = props.updatedAt;
  }

  static create(props: Omit<LiveryTemplateProps, 'createdAt' | 'adminDecals'> & {
    createdAt?: Date;
    adminDecals?: LiveryDecal[];
  }): LiveryTemplate {
    this.validate(props);

    return new LiveryTemplate({
      ...props,
      createdAt: props.createdAt ?? new Date(),
      adminDecals: props.adminDecals ?? [],
    });
  }

  private static validate(props: Omit<LiveryTemplateProps, 'createdAt' | 'adminDecals'>): void {
    if (!props.id || props.id.trim().length === 0) {
      throw new RacingDomainValidationError('LiveryTemplate ID is required');
    }

    if (!props.leagueId || props.leagueId.trim().length === 0) {
      throw new RacingDomainValidationError('LiveryTemplate leagueId is required');
    }

    if (!props.seasonId || props.seasonId.trim().length === 0) {
      throw new RacingDomainValidationError('LiveryTemplate seasonId is required');
    }

    if (!props.carId || props.carId.trim().length === 0) {
      throw new RacingDomainValidationError('LiveryTemplate carId is required');
    }

    if (!props.baseImageUrl || props.baseImageUrl.trim().length === 0) {
      throw new RacingDomainValidationError('LiveryTemplate baseImageUrl is required');
    }
  }

  /**
   * Add a decal to the template
   */
  addDecal(decal: LiveryDecal): LiveryTemplate {
    if (decal.type !== 'sponsor') {
      throw new RacingDomainInvariantError('Only sponsor decals can be added to admin template');
    }

    return new LiveryTemplate({
      ...this,
      adminDecals: [...this.adminDecals, decal],
      updatedAt: new Date(),
    });
  }

  /**
   * Remove a decal from the template
   */
  removeDecal(decalId: string): LiveryTemplate {
    const updatedDecals = this.adminDecals.filter(d => d.id !== decalId);

    if (updatedDecals.length === this.adminDecals.length) {
      throw new RacingDomainValidationError('Decal not found in template');
    }

    return new LiveryTemplate({
      ...this,
      adminDecals: updatedDecals,
      updatedAt: new Date(),
    });
  }

  /**
   * Update a decal position
   */
  updateDecal(decalId: string, updatedDecal: LiveryDecal): LiveryTemplate {
    const index = this.adminDecals.findIndex(d => d.id === decalId);
 
    if (index === -1) {
      throw new RacingDomainValidationError('Decal not found in template');
    }

    const updatedDecals = [...this.adminDecals];
    updatedDecals[index] = updatedDecal;

    return new LiveryTemplate({
      ...this,
      adminDecals: updatedDecals,
      updatedAt: new Date(),
    });
  }

  /**
   * Get all sponsor decals
   */
  getSponsorDecals(): LiveryDecal[] {
    return this.adminDecals.filter(d => d.type === 'sponsor');
  }

  /**
   * Check if template has sponsor decals
   */
  hasSponsorDecals(): boolean {
    return this.adminDecals.some(d => d.type === 'sponsor');
  }
}