import { badRequest, notFound } from '../errors.js';
import {
  getWorldFoundationCardId,
  normalizeFoundationDraftProfile,
} from './customWorldAgentDraftCompiler.js';

type DraftSectionPatch = {
  sectionId: string;
  value: string;
};

export type UpdateDraftCardSectionsParams = {
  draftProfile: Record<string, unknown>;
  cardId: string;
  sections: DraftSectionPatch[];
};

const EDITABLE_SECTION_IDS = {
  world: new Set(['title', 'subtitle', 'summary', 'playerGoal', 'tone', 'coreConflicts']),
  faction: new Set(['title', 'subtitle', 'summary', 'publicGoal', 'tension']),
  character: new Set(['name', 'role', 'publicMask', 'hiddenHook', 'relationToPlayer', 'summary']),
  landmark: new Set(['name', 'purpose', 'mood', 'secret', 'summary']),
  thread: new Set(['title', 'summary', 'conflictType', 'stakes']),
  chapter: new Set(['title', 'summary', 'openingEvent', 'playerGoal', 'understandingShift']),
  camp: new Set(['name', 'description', 'dangerLevel']),
  sceneChapter: new Set(['title', 'summary']),
} as const;

function normalizePatches(sections: DraftSectionPatch[]) {
  const normalized = sections
    .map((section) => ({
      sectionId: section.sectionId.trim(),
      value: section.value.trim(),
    }))
    .filter((section) => section.sectionId);

  if (normalized.length === 0) {
    throw badRequest('update_draft_card requires at least one section patch');
  }

  const deduped = new Map<string, string>();
  normalized.forEach((section) => {
    deduped.set(section.sectionId, section.value);
  });

  return [...deduped.entries()].map(([sectionId, value]) => ({
    sectionId,
    value,
  }));
}

function parseStringList(value: string) {
  return [...new Set(value.split(/[\n；;]+/u).map((item) => item.trim()).filter(Boolean))];
}

function parseReferenceList(value: string) {
  return [
    ...new Set(
      value
        .split(/[\n,，、；;]+/u)
        .map((item) => item.trim())
        .filter(Boolean),
    ),
  ];
}

function resolveThreadType(value: string) {
  if (value.includes('暗') || value.toLowerCase() === 'hidden') {
    return 'hidden' as const;
  }

  return 'main' as const;
}

function parseSceneActSectionId(sectionId: string) {
  const match = sectionId.match(
    /^act:([^:]+):(title|summary|backgroundImageSrc|encounterNpcIds|actGoal|transitionHook)$/u,
  );
  if (!match) {
    return null;
  }

  return {
    actId: match[1],
    field: match[2] as
      | 'title'
      | 'summary'
      | 'backgroundImageSrc'
      | 'encounterNpcIds'
      | 'actGoal'
      | 'transitionHook',
  };
}

function resolveCharacterIdByReference(
  value: string,
  draftProfile: NonNullable<ReturnType<typeof normalizeFoundationDraftProfile>>,
) {
  const characters = [...draftProfile.playableNpcs, ...draftProfile.storyNpcs];
  return (
    characters.find((entry) => entry.id === value)?.id ||
    characters.find((entry) => entry.name === value)?.id ||
    ''
  );
}

function parseEncounterNpcIds(
  value: string,
  draftProfile: NonNullable<ReturnType<typeof normalizeFoundationDraftProfile>>,
) {
  const references = parseReferenceList(value);
  if (references.length === 0) {
    throw badRequest('scene act requires at least one encounter NPC');
  }

  const unresolvedReferences = references.filter(
    (reference) => !resolveCharacterIdByReference(reference, draftProfile),
  );
  if (unresolvedReferences.length > 0) {
    throw badRequest(
      `unknown scene act NPC reference: ${unresolvedReferences.join('、')}`,
    );
  }

  return references.map((reference) =>
    resolveCharacterIdByReference(reference, draftProfile),
  );
}

export function updateDraftCardSections(params: UpdateDraftCardSectionsParams) {
  const draftProfile = normalizeFoundationDraftProfile(params.draftProfile);
  if (!draftProfile) {
    throw badRequest('draftProfile is empty');
  }

  const patches = normalizePatches(params.sections);
  const worldCardId = getWorldFoundationCardId();

  if (params.cardId === worldCardId) {
    patches.forEach(({ sectionId, value }) => {
      if (!EDITABLE_SECTION_IDS.world.has(sectionId as never)) {
        throw badRequest(`section ${sectionId} is not editable for world`);
      }

      if (sectionId === 'title') {
        draftProfile.name = value;
        return;
      }

      if (sectionId === 'subtitle') {
        draftProfile.subtitle = value;
        return;
      }

      if (sectionId === 'summary') {
        draftProfile.summary = value;
        return;
      }

      if (sectionId === 'playerGoal') {
        draftProfile.playerGoal = value;
        return;
      }

      if (sectionId === 'tone') {
        draftProfile.tone = value;
        return;
      }

      if (sectionId === 'coreConflicts') {
        draftProfile.coreConflicts = parseStringList(value);
      }
    });

    return draftProfile as unknown as Record<string, unknown>;
  }

  const faction = draftProfile.factions.find((entry) => entry.id === params.cardId);
  if (faction) {
    patches.forEach(({ sectionId, value }) => {
      if (!EDITABLE_SECTION_IDS.faction.has(sectionId as never)) {
        throw badRequest(`section ${sectionId} is not editable for faction`);
      }

      if (sectionId === 'title') {
        faction.name = value;
        faction.title = value;
        return;
      }

      if (sectionId === 'subtitle') {
        faction.subtitle = value;
        return;
      }

      if (sectionId === 'summary') {
        faction.summary = value;
        return;
      }

      if (sectionId === 'publicGoal') {
        faction.publicGoal = value;
        return;
      }

      if (sectionId === 'tension') {
        faction.tension = value;
        faction.relatedConflict = value;
      }
    });

    return draftProfile as unknown as Record<string, unknown>;
  }

  const character = [...draftProfile.playableNpcs, ...draftProfile.storyNpcs].find(
    (entry) => entry.id === params.cardId,
  );
  if (character) {
    patches.forEach(({ sectionId, value }) => {
      if (!EDITABLE_SECTION_IDS.character.has(sectionId as never)) {
        throw badRequest(`section ${sectionId} is not editable for character`);
      }

      if (sectionId === 'name') {
        character.name = value;
        return;
      }

      if (sectionId === 'role') {
        character.role = value;
        character.title = value;
        return;
      }

      if (sectionId === 'publicMask') {
        character.publicMask = value;
        character.publicIdentity = value;
        return;
      }

      if (sectionId === 'hiddenHook') {
        character.hiddenHook = value;
        character.currentPressure = value;
        return;
      }

      if (sectionId === 'relationToPlayer') {
        character.relationToPlayer = value;
        return;
      }

      if (sectionId === 'summary') {
        character.summary = value;
      }
    });

    return draftProfile as unknown as Record<string, unknown>;
  }

  const landmark = draftProfile.landmarks.find((entry) => entry.id === params.cardId);
  if (landmark) {
    patches.forEach(({ sectionId, value }) => {
      if (!EDITABLE_SECTION_IDS.landmark.has(sectionId as never)) {
        throw badRequest(`section ${sectionId} is not editable for landmark`);
      }

      if (sectionId === 'name') {
        landmark.name = value;
        return;
      }

      if (sectionId === 'purpose') {
        landmark.purpose = value;
        return;
      }

      if (sectionId === 'mood') {
        landmark.mood = value;
        return;
      }

      if (sectionId === 'secret') {
        landmark.secret = value;
        landmark.importance = value;
        return;
      }

      if (sectionId === 'summary') {
        landmark.summary = value;
      }
    });

    return draftProfile as unknown as Record<string, unknown>;
  }

  const thread = draftProfile.threads.find((entry) => entry.id === params.cardId);
  if (thread) {
    patches.forEach(({ sectionId, value }) => {
      if (!EDITABLE_SECTION_IDS.thread.has(sectionId as never)) {
        throw badRequest(`section ${sectionId} is not editable for thread`);
      }

      if (sectionId === 'title') {
        thread.title = value;
        return;
      }

      if (sectionId === 'summary') {
        thread.summary = value;
        return;
      }

      if (sectionId === 'conflictType') {
        thread.conflictType = value;
        thread.type = resolveThreadType(value);
        return;
      }

      if (sectionId === 'stakes') {
        thread.stakes = value;
        thread.conflict = value;
      }
    });

    return draftProfile as unknown as Record<string, unknown>;
  }

  const chapter = draftProfile.chapters.find((entry) => entry.id === params.cardId);
  if (chapter) {
    patches.forEach(({ sectionId, value }) => {
      if (!EDITABLE_SECTION_IDS.chapter.has(sectionId as never)) {
        throw badRequest(`section ${sectionId} is not editable for chapter`);
      }

      if (sectionId === 'title') {
        chapter.title = value;
        return;
      }

      if (sectionId === 'summary') {
        chapter.summary = value;
        return;
      }

      if (sectionId === 'openingEvent') {
        chapter.openingEvent = value;
        return;
      }

      if (sectionId === 'playerGoal') {
        chapter.playerGoal = value;
        return;
      }

      if (sectionId === 'understandingShift') {
        chapter.understandingShift = value;
      }
    });

    return draftProfile as unknown as Record<string, unknown>;
  }

  const sceneChapter = draftProfile.sceneChapters.find(
    (entry) => entry.id === params.cardId,
  );
  if (sceneChapter) {
    patches.forEach(({ sectionId, value }) => {
      if (EDITABLE_SECTION_IDS.sceneChapter.has(sectionId as never)) {
        if (sectionId === 'title') {
          sceneChapter.title = value;
          return;
        }

        if (sectionId === 'summary') {
          sceneChapter.summary = value;
        }
        return;
      }

      const parsedSceneActSection = parseSceneActSectionId(sectionId);
      if (!parsedSceneActSection) {
        throw badRequest(`section ${sectionId} is not editable for scene_chapter`);
      }

      const targetAct = sceneChapter.acts.find(
        (entry) => entry.id === parsedSceneActSection.actId,
      );
      if (!targetAct) {
        throw notFound(`scene act ${parsedSceneActSection.actId} not found`);
      }

      if (parsedSceneActSection.field === 'title') {
        targetAct.title = value;
        return;
      }

      if (parsedSceneActSection.field === 'summary') {
        targetAct.summary = value;
        return;
      }

      if (parsedSceneActSection.field === 'backgroundImageSrc') {
        targetAct.backgroundImageSrc = value || null;
        return;
      }

      if (parsedSceneActSection.field === 'encounterNpcIds') {
        const encounterNpcIds = parseEncounterNpcIds(value, draftProfile);
        targetAct.encounterNpcIds = encounterNpcIds;
        targetAct.primaryNpcId = encounterNpcIds[0] || '';
        return;
      }

      if (parsedSceneActSection.field === 'actGoal') {
        targetAct.actGoal = value;
        return;
      }

      if (parsedSceneActSection.field === 'transitionHook') {
        targetAct.transitionHook = value;
      }
    });

    return draftProfile as unknown as Record<string, unknown>;
  }

  if (draftProfile.camp?.id === params.cardId) {
    patches.forEach(({ sectionId, value }) => {
      if (!EDITABLE_SECTION_IDS.camp.has(sectionId as never)) {
        throw badRequest(`section ${sectionId} is not editable for camp`);
      }

      if (sectionId === 'name') {
        draftProfile.camp!.name = value;
        return;
      }

      if (sectionId === 'description') {
        draftProfile.camp!.description = value;
        return;
      }

      if (sectionId === 'dangerLevel') {
        draftProfile.camp!.dangerLevel = value;
        draftProfile.camp!.mood = value;
      }
    });

    return draftProfile as unknown as Record<string, unknown>;
  }

  throw notFound('draft card not found');
}