import { useEffect, useMemo, useRef, useState } from 'react';

import { normalizeCustomWorldLandmarks } from '../../data/customWorldSceneGraph';
import { rpgCreationAssetClient } from '../../services/rpg-creation/rpgCreationAssetClient';
import type {
  CustomWorldLandmark,
  CustomWorldNpc,
  CustomWorldPlayableNpc,
  CustomWorldProfile,
} from '../../types';
import type { ResultTab } from '../CustomWorldEntityCatalog';
import type { RpgCreationEditorTarget } from '../rpg-creation-editor/RpgCreationEntityEditorModal';

export type EntityGenerationKind = 'playable' | 'story' | 'landmark';

export type PendingGeneratedEntity = {
  id: string;
  kind: EntityGenerationKind;
  title: string;
  progress: number;
  phaseLabel: string;
};

export type RecentGeneratedIds = Record<EntityGenerationKind, string[]>;

export type AgentEntityGenerationResult = {
  profile?: CustomWorldProfile | null;
};

function getCreateTargetByTab(
  activeTab: ResultTab,
): RpgCreationEditorTarget | null {
  if (activeTab === 'playable') return { kind: 'playable', mode: 'create' };
  if (activeTab === 'story') return { kind: 'story', mode: 'create' };
  if (activeTab === 'landmarks') return { kind: 'landmark', mode: 'create' };
  return null;
}

function getCreateLabelByTab(activeTab: ResultTab) {
  if (activeTab === 'playable') return '新增可扮演角色';
  if (activeTab === 'story') return '新增场景角色';
  if (activeTab === 'landmarks') return '新增场景';
  return '';
}

function createPendingGeneratedEntity(
  kind: EntityGenerationKind,
): PendingGeneratedEntity {
  return {
    id: `pending-${kind}-${Date.now()}`,
    kind,
    title:
      kind === 'playable'
        ? '新可扮演角色'
        : kind === 'story'
          ? '新场景角色'
          : '新场景',
    progress: 8,
    phaseLabel: '正在整理世界上下文',
  };
}

function resolvePendingPhaseLabel(
  kind: EntityGenerationKind,
  progress: number,
) {
  if (progress < 28) {
    return '正在整理世界上下文';
  }
  if (progress < 72) {
    return kind === 'landmark' ? '正在推理场景结构' : '正在推理角色结构';
  }
  return '正在回写结果';
}

function prependPlayableNpc(
  profile: CustomWorldProfile,
  npc: CustomWorldPlayableNpc,
) {
  return {
    ...profile,
    playableNpcs: [npc, ...profile.playableNpcs],
  } satisfies CustomWorldProfile;
}

function prependStoryNpc(profile: CustomWorldProfile, npc: CustomWorldNpc) {
  return {
    ...profile,
    storyNpcs: [npc, ...profile.storyNpcs],
  } satisfies CustomWorldProfile;
}

function prependLandmark(
  profile: CustomWorldProfile,
  landmark: CustomWorldLandmark,
) {
  return {
    ...profile,
    landmarks: normalizeCustomWorldLandmarks({
      landmarks: [landmark, ...profile.landmarks],
      storyNpcs: profile.storyNpcs,
    }),
  } satisfies CustomWorldProfile;
}

function getEntityCountByKind(
  profile: CustomWorldProfile,
  kind: EntityGenerationKind,
) {
  if (kind === 'playable') return profile.playableNpcs.length;
  if (kind === 'story') return profile.storyNpcs.length;
  return profile.landmarks.length;
}

function removeStoryNpcsFromProfile(
  profile: CustomWorldProfile,
  ids: string[],
) {
  const idSet = new Set(ids);
  const nextStoryNpcs = profile.storyNpcs.filter((npc) => !idSet.has(npc.id));

  return {
    ...profile,
    storyNpcs: nextStoryNpcs,
    landmarks: normalizeCustomWorldLandmarks({
      landmarks: profile.landmarks.map((landmark) => ({
        ...landmark,
        sceneNpcIds: landmark.sceneNpcIds.filter((npcId) => !idSet.has(npcId)),
      })),
      storyNpcs: nextStoryNpcs,
    }),
  } satisfies CustomWorldProfile;
}

function removeLandmarksFromProfile(
  profile: CustomWorldProfile,
  ids: string[],
) {
  const idSet = new Set(ids);
  const nextLandmarks = profile.landmarks.filter(
    (landmark) => !idSet.has(landmark.id),
  );

  return {
    ...profile,
    landmarks: normalizeCustomWorldLandmarks({
      landmarks: nextLandmarks.map((landmark) => ({
        ...landmark,
        connections: landmark.connections.filter(
          (connection) => !idSet.has(connection.targetLandmarkId),
        ),
      })),
      storyNpcs: profile.storyNpcs,
    }),
  } satisfies CustomWorldProfile;
}

export function useRpgCreationResultActions(params: {
  activeTab: ResultTab;
  agentEntityGenerator?:
    | ((kind: EntityGenerationKind) => Promise<AgentEntityGenerationResult | void>)
    | undefined;
  isGenerating: boolean;
  onProfileChange: (profile: CustomWorldProfile) => void;
  profile: CustomWorldProfile;
  readOnly: boolean;
  triggerRegenerate?: () => void;
}) {
  const {
    activeTab,
    agentEntityGenerator,
    isGenerating,
    onProfileChange,
    profile,
    readOnly,
    triggerRegenerate,
  } = params;
  const [editorTarget, setEditorTarget] =
    useState<RpgCreationEditorTarget | null>(null);
  const [pendingGeneratedEntity, setPendingGeneratedEntity] =
    useState<PendingGeneratedEntity | null>(null);
  const [recentGeneratedIds, setRecentGeneratedIds] = useState<RecentGeneratedIds>(
    {
      playable: [],
      story: [],
      landmark: [],
    },
  );
  const [localGenerationError, setLocalGenerationError] = useState<string | null>(
    null,
  );
  const pendingProgressTimerRef = useRef<number | null>(null);

  const createTarget = useMemo(
    () => getCreateTargetByTab(activeTab),
    [activeTab],
  );
  const createLabel = useMemo(
    () => getCreateLabelByTab(activeTab),
    [activeTab],
  );

  const stopPendingProgressTimer = () => {
    if (pendingProgressTimerRef.current !== null) {
      window.clearInterval(pendingProgressTimerRef.current);
      pendingProgressTimerRef.current = null;
    }
  };

  useEffect(() => () => stopPendingProgressTimer(), []);

  const startPendingProgress = (kind: EntityGenerationKind) => {
    stopPendingProgressTimer();
    setPendingGeneratedEntity(createPendingGeneratedEntity(kind));
    pendingProgressTimerRef.current = window.setInterval(() => {
      setPendingGeneratedEntity((current) => {
        if (!current || current.kind !== kind) {
          return current;
        }

        const nextProgress = Math.min(
          current.progress + (current.progress < 56 ? 11 : 5),
          88,
        );

        return {
          ...current,
          progress: nextProgress,
          phaseLabel: resolvePendingPhaseLabel(kind, nextProgress),
        };
      });
    }, 520);
  };

  const finishPendingProgress = () => {
    stopPendingProgressTimer();
    setPendingGeneratedEntity(null);
  };

  const markGeneratedAsRecent = (
    kind: EntityGenerationKind,
    generatedId: string,
  ) => {
    setRecentGeneratedIds((current) => ({
      ...current,
      [kind]: [
        generatedId,
        ...current[kind].filter((id) => id !== generatedId),
      ].slice(0, 6),
    }));
  };

  const handleGenerateEntity = async (kind: EntityGenerationKind) => {
    if (readOnly || isGenerating || pendingGeneratedEntity) {
      return;
    }

    setLocalGenerationError(null);
    startPendingProgress(kind);

    try {
      if (agentEntityGenerator) {
        const previousCount = getEntityCountByKind(profile, kind);
        const generationResult = await agentEntityGenerator(kind);
        const currentCount = generationResult?.profile
          ? getEntityCountByKind(generationResult.profile, kind)
          : previousCount;
        if (currentCount <= previousCount) {
          throw new Error('生成请求已完成，但结果页未收到新增内容，请返回创作页重新打开草稿后重试。');
        }
      } else if (kind === 'playable') {
        const nextNpc = await rpgCreationAssetClient.generatePlayableNpc({
          profile,
        });
        onProfileChange(prependPlayableNpc(profile, nextNpc));
        markGeneratedAsRecent('playable', nextNpc.id);
      } else if (kind === 'story') {
        const nextNpc = await rpgCreationAssetClient.generateStoryNpc({
          profile,
        });
        onProfileChange(prependStoryNpc(profile, nextNpc));
        markGeneratedAsRecent('story', nextNpc.id);
      } else {
        const nextLandmark = await rpgCreationAssetClient.generateLandmark({
          profile,
        });
        onProfileChange(prependLandmark(profile, nextLandmark));
        markGeneratedAsRecent('landmark', nextLandmark.id);
      }
    } catch (generationError) {
      setLocalGenerationError(
        generationError instanceof Error
          ? generationError.message
          : '生成失败，请稍后重试。',
      );
    } finally {
      finishPendingProgress();
    }
  };

  const handleRegenerate = () => {
    if (isGenerating || !triggerRegenerate) {
      return;
    }

    const confirmed = window.confirm(
      `确认重新生成“${profile.name}”吗？\n\n重新生成会重新生成当前世界中的所有信息，包括你修改和新增的所有内容。`,
    );
    if (!confirmed) {
      return;
    }

    triggerRegenerate();
  };

  const handleDeleteStoryNpcs = (ids: string[]) => {
    if (ids.length === 0) {
      return;
    }
    onProfileChange(removeStoryNpcsFromProfile(profile, ids));
  };

  const handleDeleteLandmarks = (ids: string[]) => {
    if (ids.length === 0) {
      return;
    }
    onProfileChange(removeLandmarksFromProfile(profile, ids));
  };

  return {
    createLabel,
    createTarget,
    editorTarget,
    handleDeleteLandmarks,
    handleDeleteStoryNpcs,
    handleGenerateEntity,
    handleRegenerate,
    localGenerationError,
    pendingGeneratedEntity,
    recentGeneratedIds,
    setEditorTarget,
    closeEditorTarget: () => setEditorTarget(null),
  };
}