import {
  type CustomWorldCampScene,
  type CustomWorldProfile,
} from '../types';
import { detectCustomWorldThemeMode } from './customWorldTheme';

type CampProfileSeed = Pick<
  CustomWorldProfile,
  'name' | 'summary' | 'tone' | 'playerGoal' | 'settingText' | 'templateWorldType'
> & {
  camp?: Pick<
    CustomWorldCampScene,
    | 'id'
    | 'name'
    | 'description'
    | 'visualDescription'
    | 'imageSrc'
    | 'sceneNpcIds'
    | 'connections'
    | 'narrativeResidues'
  > | null;
};

function clampText(value: string, maxLength: number) {
  const normalized = value.trim().replace(/\s+/g, ' ');
  if (!normalized) {
    return '';
  }
  if (normalized.length <= maxLength) {
    return normalized;
  }
  return `${normalized.slice(0, Math.max(0, maxLength - 1)).trim()}…`;
}

function sanitizeCampSeed(name: string) {
  const normalized = name.trim().replace(/\s+/g, '');
  if (!normalized) {
    return '';
  }

  const stripped = normalized.replace(
    /(世界|江湖|边城|仙洲|仙境|灵境|界|录|域|境)$/u,
    '',
  );
  const seed = stripped || normalized;

  return seed.slice(0, Math.min(seed.length, 4));
}

function buildFallbackCampName(profile: CampProfileSeed) {
  const seed =
    sanitizeCampSeed(profile.name) ||
    '归途';
  const themeMode = detectCustomWorldThemeMode(profile);

  const suffixByMode = {
    mythic: '归舍',
    martial: '归舍',
    arcane: '栖居',
    machina: '整备居',
    tide: '潮居',
    rift: '界隙居所',
  } as const;

  return `${seed}${suffixByMode[themeMode]}`;
}

function buildFallbackCampDescription(profile: CampProfileSeed, campName: string) {
  const summaryLead = clampText(profile.summary, 24) || '前路尚未明朗';
  const goalLead = clampText(profile.playerGoal, 24) || '继续整理线索';
  const themeMode = detectCustomWorldThemeMode(profile);

  const descriptionByMode = {
    mythic: `${campName}是你在${profile.name}暂时安顿的归处，能整备行装、交换判断，并围绕“${goalLead}”继续启程。`,
    martial: `${campName}是你在${profile.name}暂时落脚的归处，能整备行装、收拢同伴，并朝“${goalLead}”继续动身。`,
    arcane: `${campName}是你在${profile.name}暂时栖身的居所，适合调息、整理法器，并围绕“${summaryLead}”交换判断。`,
    machina: `${campName}是你在${profile.name}的临时居所，能检修装备、补齐物资，并为下一段行动重新校准节奏。`,
    tide: `${campName}是你在${profile.name}靠潮歇息的住处，能安顿队伍、整理补给，并顺着“${goalLead}”继续前探。`,
    rift: `${campName}是你在${profile.name}勉强守住的一处居所，既能短暂停步，也能围绕“${summaryLead}”商量下一步去向。`,
  } as const;

  return descriptionByMode[themeMode];
}

export function buildFallbackCustomWorldCampScene(
  profile: CampProfileSeed,
): CustomWorldCampScene {
  const fallbackName = buildFallbackCampName(profile);

  return {
    id: 'custom-scene-camp',
    name: fallbackName,
    description: buildFallbackCampDescription(profile, fallbackName),
    sceneNpcIds: [],
    connections: [],
    narrativeResidues: null,
  };
}

export function resolveCustomWorldCampScene(
  profile: CampProfileSeed,
): CustomWorldCampScene {
  const fallback = buildFallbackCustomWorldCampScene(profile);
  const camp = profile.camp;

  return {
    id: camp?.id?.trim() || fallback.id,
    name: camp?.name?.trim() || fallback.name,
    description: camp?.description?.trim() || fallback.description,
    visualDescription: camp?.visualDescription?.trim() || undefined,
    imageSrc: camp?.imageSrc?.trim() || undefined,
    sceneNpcIds: Array.isArray(camp?.sceneNpcIds)
      ? [...new Set(camp.sceneNpcIds.map((entry) => entry.trim()).filter(Boolean))]
      : fallback.sceneNpcIds,
    connections: Array.isArray(camp?.connections)
      ? camp.connections
      : fallback.connections,
    narrativeResidues: camp?.narrativeResidues ?? fallback.narrativeResidues,
  };
}