import type {
  Dispatch,
  SetStateAction,
} from 'react';

import {
  buildEncounterEntryState,
  hasEncounterEntity,
} from '../../data/encounterTransition';
import { rollHostileNpcLoot } from '../../data/hostileNpcPresets';
import { addInventoryItems } from '../../data/npcInteractions';
import { applyQuestProgressFromHostileNpcDefeat } from '../../data/questFlow';
import {
  CALL_OUT_ENTRY_X_METERS,
  createSceneEncounterPreview,
  resolveSceneEncounterPreview,
} from '../../data/sceneEncounterPreviews';
import { generateNextStep } from '../../services/ai';
import type { StoryGenerationContext } from '../../services/aiTypes';
import { createHistoryMoment } from '../../services/storyHistory';
import {
  AnimationState,
  type Character,
  type Encounter,
  type GameState,
  type StoryMoment,
  type StoryOption,
} from '../../types';
import type { EscapePlaybackSync } from '../combat/escapeFlow';
import type { ResolvedChoiceState } from '../combat/resolvedChoice';
import type {
  CommitGeneratedStateWithEncounterEntry,
  GenerateStoryForState,
} from './progressionActions';
import type { BattleRewardSummary } from './uiTypes';

type RuntimeStatsIncrements = Partial<Pick<GameState['runtimeStats'], 'hostileNpcsDefeated' | 'questsAccepted' | 'itemsUsed' | 'scenesTraveled'>>;

type BuildFallbackStoryForState = (
  state: GameState,
  character: Character,
  fallbackText?: string,
) => StoryMoment;

type BuildStoryFromResponse = (
  state: GameState,
  character: Character,
  response: StoryMoment,
  availableOptions: StoryOption[] | null,
  optionCatalog?: StoryOption[] | null,
) => StoryMoment;

type BuildNpcStory = (
  state: GameState,
  character: Character,
  encounter: Encounter,
  overrideText?: string,
) => StoryMoment;

type BuildStoryContextFromState = (
  state: GameState,
  extras?: { lastFunctionId?: string | null; observeSignsRequested?: boolean },
) => StoryGenerationContext;

type UpdateQuestLog = (
  state: GameState,
  updater: (quests: GameState['quests']) => GameState['quests'],
) => GameState;

type IncrementRuntimeStats = (
  state: GameState,
  increments: RuntimeStatsIncrements,
) => GameState;

function sleep(ms: number) {
  return new Promise(resolve => window.setTimeout(resolve, ms));
}

function buildReasonedOptionCatalog(options: StoryOption[]) {
  const seenFunctionIds = new Set<string>();

  return options.filter(option => {
    if (seenFunctionIds.has(option.functionId)) {
      return false;
    }

    seenFunctionIds.add(option.functionId);
    return true;
  });
}

function buildHostileNpcBattleReward(
  state: GameState,
  afterSequence: GameState,
  getResolvedSceneHostileNpcs: (state: GameState) => GameState['sceneMonsters'],
): BattleRewardSummary | null {
  if (!state.worldType || state.currentBattleNpcId || !state.inBattle || afterSequence.inBattle) {
    return null;
  }

  const activeHostileNpcs = getResolvedSceneHostileNpcs(state);
  const nextHostileNpcs = getResolvedSceneHostileNpcs(afterSequence);
  const defeatedHostileNpcs = activeHostileNpcs.filter(hostileNpc =>
    !nextHostileNpcs.some(nextHostileNpc => nextHostileNpc.id === hostileNpc.id),
  );

  if (defeatedHostileNpcs.length === 0) {
    return null;
  }

  const rolledItems = rollHostileNpcLoot(
    state,
    defeatedHostileNpcs.map(hostileNpc => ({
      id: hostileNpc.id,
      name: hostileNpc.name,
    })),
  );

  return {
    id: `battle-reward-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
    defeatedHostileNpcs: defeatedHostileNpcs.map(hostileNpc => ({
      id: hostileNpc.id,
      name: hostileNpc.name,
    })),
    items: addInventoryItems([], rolledItems),
  };
}

export function createStoryChoiceActions({
  gameState,
  currentStory,
  isLoading,
  setGameState,
  setCurrentStory,
  setAiError,
  setIsLoading,
  setBattleReward,
  buildResolvedChoiceState,
  playResolvedChoice,
  buildStoryContextFromState,
  buildStoryFromResponse,
  buildFallbackStoryForState,
  generateStoryForState,
  getAvailableOptionsForState,
  getStoryGenerationHostileNpcs,
  getResolvedSceneHostileNpcs,
  buildNpcStory,
  updateQuestLog,
  incrementRuntimeStats,
  getCampCompanionTravelScene,
  startOpeningAdventure,
  enterNpcInteraction,
  handleNpcInteraction,
  handleTreasureInteraction,
  commitGeneratedStateWithEncounterEntry,
  finalizeNpcBattleResult,
  isContinueAdventureOption,
  isCampTravelHomeOption,
  isInitialCompanionEncounter,
  isRegularNpcEncounter,
  isNpcEncounter,
  npcPreviewTalkFunctionId,
  fallbackCompanionName,
  turnVisualMs,
}: {
  gameState: GameState;
  currentStory: StoryMoment | null;
  isLoading: boolean;
  setGameState: Dispatch<SetStateAction<GameState>>;
  setCurrentStory: Dispatch<SetStateAction<StoryMoment | null>>;
  setAiError: Dispatch<SetStateAction<string | null>>;
  setIsLoading: Dispatch<SetStateAction<boolean>>;
  setBattleReward: Dispatch<SetStateAction<BattleRewardSummary | null>>;
  buildResolvedChoiceState: (state: GameState, option: StoryOption, character: Character) => ResolvedChoiceState;
  playResolvedChoice: (
    state: GameState,
    option: StoryOption,
    character: Character,
    resolvedChoice: ResolvedChoiceState,
    sync?: EscapePlaybackSync,
  ) => Promise<GameState>;
  buildStoryContextFromState: BuildStoryContextFromState;
  buildStoryFromResponse: BuildStoryFromResponse;
  buildFallbackStoryForState: BuildFallbackStoryForState;
  generateStoryForState: GenerateStoryForState;
  getAvailableOptionsForState: (state: GameState, character: Character) => StoryOption[] | null;
  getStoryGenerationHostileNpcs: (state: GameState) => GameState['sceneMonsters'];
  getResolvedSceneHostileNpcs: (state: GameState) => GameState['sceneMonsters'];
  buildNpcStory: BuildNpcStory;
  updateQuestLog: UpdateQuestLog;
  incrementRuntimeStats: IncrementRuntimeStats;
  getCampCompanionTravelScene: (state: GameState, character: Character) => GameState['currentScenePreset'] | null;
  startOpeningAdventure: () => Promise<void>;
  enterNpcInteraction: (encounter: Encounter, actionText: string) => boolean;
  handleNpcInteraction: (option: StoryOption) => boolean;
  handleTreasureInteraction: (option: StoryOption) => void | Promise<void> | boolean;
  commitGeneratedStateWithEncounterEntry: CommitGeneratedStateWithEncounterEntry;
  finalizeNpcBattleResult: (
    state: GameState,
    character: Character,
    battleMode: NonNullable<GameState['currentNpcBattleMode']>,
    battleOutcome: GameState['currentNpcBattleOutcome'],
  ) => { nextState: GameState; resultText: string } | null;
  isContinueAdventureOption: (option: StoryOption) => boolean;
  isCampTravelHomeOption: (option: StoryOption) => boolean;
  isInitialCompanionEncounter: (encounter: GameState['currentEncounter']) => encounter is Encounter;
  isRegularNpcEncounter: (encounter: GameState['currentEncounter']) => encounter is Encounter;
  isNpcEncounter: (encounter: GameState['currentEncounter']) => encounter is Encounter;
  npcPreviewTalkFunctionId: string;
  fallbackCompanionName: string;
  turnVisualMs: number;
}) {
  const handleCampTravelHome = async (option: StoryOption, character: Character) => {
    const targetScene = getCampCompanionTravelScene(gameState, character);
    if (!targetScene) {
      return;
    }

    setBattleReward(null);
    setAiError(null);

    const companionName = isNpcEncounter(gameState.currentEncounter)
      ? gameState.currentEncounter.npcName
      : fallbackCompanionName;
    const travelRunState: GameState = {
      ...gameState,
      ambientIdleMode: undefined,
      currentEncounter: null,
      npcInteractionActive: false,
      sceneHostileNpcs: [],
      playerX: 0,
      playerFacing: 'right' as const,
      animationState: AnimationState.RUN,
      playerActionMode: 'idle' as const,
      activeCombatEffects: [],
      scrollWorld: true,
      inBattle: false,
      lastObserveSignsSceneId: null,
      lastObserveSignsReport: null,
      currentBattleNpcId: null,
      currentNpcBattleMode: null,
      currentNpcBattleOutcome: null,
      sparReturnEncounter: null,
      sparPlayerHpBefore: null,
      sparPlayerMaxHpBefore: null,
      sparStoryHistoryBefore: null,
    };
    const travelBaseState: GameState = incrementRuntimeStats({
      ...gameState,
      ambientIdleMode: undefined,
      currentScenePreset: targetScene,
      currentEncounter: null,
      npcInteractionActive: false,
      sceneHostileNpcs: [],
      playerX: 0,
      playerFacing: 'right' as const,
      animationState: AnimationState.IDLE,
      playerActionMode: 'idle' as const,
      activeCombatEffects: [],
      scrollWorld: false,
      inBattle: false,
      lastObserveSignsSceneId: null,
      lastObserveSignsReport: null,
      currentBattleNpcId: null,
      currentNpcBattleMode: null,
      currentNpcBattleOutcome: null,
      sparReturnEncounter: null,
      sparPlayerHpBefore: null,
      sparPlayerMaxHpBefore: null,
      sparStoryHistoryBefore: null,
    }, {
      scenesTraveled: 1,
    });
    const travelPreviewState: GameState = {
      ...travelBaseState,
      ...createSceneEncounterPreview(travelBaseState),
    };
    const resolvedState = hasEncounterEntity(travelPreviewState)
      ? resolveSceneEncounterPreview(travelPreviewState)
      : travelBaseState;
    const entryState = buildEncounterEntryState(resolvedState, CALL_OUT_ENTRY_X_METERS);

    setIsLoading(true);
    setGameState(travelRunState);
    await sleep(turnVisualMs);

    await commitGeneratedStateWithEncounterEntry(
      entryState,
      resolvedState,
      character,
      option.actionText,
      `You and ${companionName} leave camp and formally step into ${targetScene.name} to begin the adventure.`,
      option.functionId,
    );
    return;
  };

  const handleChoice = async (option: StoryOption) => {
    const character = gameState.playerCharacter;
    if (!gameState.worldType || !character || isLoading) return;

    if (currentStory?.deferredOptions?.length && isContinueAdventureOption(option)) {
      setCurrentStory({
        ...currentStory,
        options: currentStory.deferredOptions,
        deferredOptions: undefined,
      });
      return;
    }

    if (isCampTravelHomeOption(option)) {
      await handleCampTravelHome(option, character);
      return;
    }

    if (
      option.functionId === npcPreviewTalkFunctionId
      && isInitialCompanionEncounter(gameState.currentEncounter)
      && !gameState.npcInteractionActive
    ) {
      setAiError(null);
      void startOpeningAdventure();
      return;
    }

    if (
      option.functionId === npcPreviewTalkFunctionId
      && isRegularNpcEncounter(gameState.currentEncounter)
      && !gameState.npcInteractionActive
    ) {
      setAiError(null);
      enterNpcInteraction(gameState.currentEncounter, option.actionText);
      return;
    }

    if (option.interaction?.kind === 'npc') {
      setAiError(null);
      handleNpcInteraction(option);
      return;
    }

    if (option.interaction?.kind === 'treasure') {
      setAiError(null);
      handleTreasureInteraction(option);
      return;
    }

    setBattleReward(null);
    setAiError(null);
    setIsLoading(true);

    const baseChoiceState = (
      isRegularNpcEncounter(gameState.currentEncounter)
      && !gameState.npcInteractionActive
      && !option.interaction
    )
      ? {
          ...gameState,
          currentEncounter: null,
          npcInteractionActive: false,
        }
      : gameState;

    let fallbackState = baseChoiceState;

    try {
      const history = baseChoiceState.storyHistory;
      const resolvedChoice = buildResolvedChoiceState(baseChoiceState, option, character);
      const projectedState = resolvedChoice.afterSequence;
      const shouldUseLocalNpcVictory = Boolean(
        baseChoiceState.currentBattleNpcId &&
        resolvedChoice.optionKind === 'battle' &&
        (
          projectedState.currentNpcBattleOutcome ||
          (baseChoiceState.currentNpcBattleMode === 'fight' && !projectedState.inBattle)
        ),
      );
      const projectedBattleReward = shouldUseLocalNpcVictory
        ? null
        : buildHostileNpcBattleReward(baseChoiceState, projectedState, getResolvedSceneHostileNpcs);
      const projectedStateWithBattleReward = projectedBattleReward
        ? {
            ...projectedState,
            playerInventory: addInventoryItems(projectedState.playerInventory, projectedBattleReward.items),
          }
        : projectedState;
      fallbackState = projectedStateWithBattleReward;
      const projectedAvailableOptions = getAvailableOptionsForState(
        projectedStateWithBattleReward,
        character,
      );

      const responsePromise = shouldUseLocalNpcVictory
        ? Promise.resolve(null)
        : generateNextStep(
            gameState.worldType,
            character,
            getStoryGenerationHostileNpcs(projectedStateWithBattleReward),
            history,
            option.actionText,
            buildStoryContextFromState(projectedStateWithBattleReward, {
              lastFunctionId: option.functionId,
              observeSignsRequested: option.functionId === 'idle_observe_signs',
            }),
            projectedAvailableOptions ? { availableOptions: projectedAvailableOptions } : undefined,
          );
      const responseSettledPromise = responsePromise.then(() => undefined, () => undefined);
      const playbackSync: EscapePlaybackSync | undefined = resolvedChoice.optionKind === 'escape'
        ? { waitForStoryResponse: responseSettledPromise }
        : undefined;
      const actionPromise = playResolvedChoice(
        baseChoiceState,
        option,
        character,
        resolvedChoice,
        playbackSync,
      );
      const [actionResult, responseResult] = await Promise.allSettled([actionPromise, responsePromise]);

      if (actionResult.status === 'rejected') {
        throw actionResult.reason;
      }

      let afterSequence = shouldUseLocalNpcVictory ? resolvedChoice.afterSequence : actionResult.value;
      if (projectedBattleReward) {
        afterSequence = {
          ...afterSequence,
          playerInventory: addInventoryItems(afterSequence.playerInventory, projectedBattleReward.items),
        };
      }
      fallbackState = afterSequence;

      if (shouldUseLocalNpcVictory) {
        const victory = finalizeNpcBattleResult(
          afterSequence,
          character,
          baseChoiceState.currentNpcBattleMode!,
          afterSequence.currentNpcBattleOutcome,
        );
        if (victory) {
          const historyBase = baseChoiceState.currentNpcBattleMode === 'spar'
            ? (afterSequence.sparStoryHistoryBefore ?? [])
            : baseChoiceState.storyHistory;
          const nextHistory = [
            ...historyBase,
            createHistoryMoment(victory.resultText, 'result'),
          ];
          const nextState = {
            ...victory.nextState,
            storyHistory: nextHistory,
          };
          const postBattleOptionCatalog = baseChoiceState.currentNpcBattleMode === 'spar' && nextState.currentEncounter
            ? buildReasonedOptionCatalog(
                buildNpcStory(
                  nextState,
                  character,
                  nextState.currentEncounter,
                ).options,
              )
            : null;
          fallbackState = nextState;
          setGameState(nextState);
          try {
            const nextStory = await generateStoryForState({
              state: nextState,
              character,
              history: nextHistory,
              choice: option.actionText,
              lastFunctionId: option.functionId,
              optionCatalog: postBattleOptionCatalog,
            });
            setCurrentStory(nextStory);
          } catch (storyError) {
            console.error('Failed to continue npc battle resolution story:', storyError);
            setAiError(storyError instanceof Error ? storyError.message : '未知智能生成错误');
            setCurrentStory(buildFallbackStoryForState(nextState, character, victory.resultText));
          }
          return;
        }
      }

      if (responseResult.status === 'rejected') {
        throw responseResult.reason;
      }

      const response = responseResult.value!;
      const defeatedHostileNpcIds = baseChoiceState.currentBattleNpcId
        ? []
        : getResolvedSceneHostileNpcs(baseChoiceState)
            .map(hostileNpc => hostileNpc.id)
            .filter(hostileNpcId => !getResolvedSceneHostileNpcs(afterSequence).some(hostileNpc => hostileNpc.id === hostileNpcId));
      const nextHistory = [
        ...baseChoiceState.storyHistory,
        createHistoryMoment(option.actionText, 'action'),
        createHistoryMoment(response.storyText, 'result', response.options),
      ];

      const nextState = incrementRuntimeStats({
        ...updateQuestLog(
          afterSequence,
          quests => applyQuestProgressFromHostileNpcDefeat(
            quests,
            baseChoiceState.currentScenePreset?.id ?? null,
            defeatedHostileNpcIds,
          ),
        ),
        lastObserveSignsSceneId: option.functionId === 'idle_observe_signs'
          ? (afterSequence.currentScenePreset?.id ?? null)
          : afterSequence.lastObserveSignsSceneId ?? null,
        lastObserveSignsReport: option.functionId === 'idle_observe_signs'
          ? response.storyText
          : afterSequence.lastObserveSignsReport ?? null,
        storyHistory: nextHistory,
      }, {
        hostileNpcsDefeated: defeatedHostileNpcIds.length,
      });

      setGameState(nextState);
      if (projectedBattleReward) {
        setBattleReward(projectedBattleReward);
      }

      setCurrentStory(
        buildStoryFromResponse(
          nextState,
          character,
          {
            text: response.storyText,
            options: response.options,
          },
          projectedAvailableOptions,
        ),
      );
    } catch (error) {
      console.error('Failed to get next step:', error);
      setAiError(error instanceof Error ? error.message : '未知智能生成错误');
      setCurrentStory(buildFallbackStoryForState(fallbackState, character));
    } finally {
      setIsLoading(false);
    }
  };

  return {
    handleChoice,
  };
}