import { applyStoryReasoningRecovery } from '../../data/storyRecovery';
import { generateNextStep } from '../../services/aiService';
import type { StoryGenerationContext } from '../../services/aiTypes';
import { createHistoryMoment } from '../../services/storyHistory';
import type {
  Character,
  Encounter,
  GameState,
  StoryMoment,
  StoryOption,
} from '../../types';
import type { ResolvedChoiceState } from '../combat/resolvedChoice';
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 HandleNpcBattleConversationContinuation = (params: {
  nextState: GameState;
  encounter: Encounter;
  character: Character;
  actionText: string;
  resultText: string;
  battleMode: NonNullable<GameState['currentNpcBattleMode']>;
}) => boolean;

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

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

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

function isBackendOwnedCombatChoice(option: StoryOption) {
  return (
    option.functionId.startsWith('battle_') ||
    option.functionId === 'inventory_use'
  );
}

export async function runLocalStoryChoiceContinuation(params: {
  gameState: GameState;
  currentStory: StoryMoment | null;
  option: StoryOption;
  character: Character;
  setGameState: (state: GameState) => void;
  setCurrentStory: (story: StoryMoment) => void;
  setAiError: (message: string | null) => void;
  setIsLoading: (loading: boolean) => void;
  setBattleReward: (reward: BattleRewardSummary | null) => void;
  buildResolvedChoiceState: (
    state: GameState,
    option: StoryOption,
    character: Character,
  ) => ResolvedChoiceState;
  playResolvedChoice: (
    state: GameState,
    option: StoryOption,
    character: Character,
    resolvedChoice: ResolvedChoiceState,
  ) => Promise<GameState>;
  buildStoryContextFromState: BuildStoryContextFromState;
  buildStoryFromResponse: BuildStoryFromResponse;
  buildFallbackStoryForState: BuildFallbackStoryForState;
  generateStoryForState: (params: {
    state: GameState;
    character: Character;
    history: StoryMoment[];
    choice?: string;
    lastFunctionId?: string | null;
    optionCatalog?: StoryOption[] | null;
  }) => Promise<StoryMoment>;
  getAvailableOptionsForState: (
    state: GameState,
    character: Character,
  ) => StoryOption[] | null;
  getStoryGenerationHostileNpcs: (
    state: GameState,
  ) => GameState['sceneHostileNpcs'];
  getResolvedSceneHostileNpcs: (
    state: GameState,
  ) => GameState['sceneHostileNpcs'];
  buildNpcStory: BuildNpcStory;
  handleNpcBattleConversationContinuation: HandleNpcBattleConversationContinuation;
  updateQuestLog: UpdateQuestLog;
  incrementRuntimeStats: IncrementRuntimeStats;
  finalizeNpcBattleResult: (
    state: GameState,
    character: Character,
    battleMode: NonNullable<GameState['currentNpcBattleMode']>,
    battleOutcome: GameState['currentNpcBattleOutcome'],
  ) => { nextState: GameState; resultText: string } | null;
  isRegularNpcEncounter: (
    encounter: GameState['currentEncounter'],
  ) => encounter is Encounter;
}) {
  params.setBattleReward(null);
  params.setAiError(null);
  params.setIsLoading(true);

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

  let fallbackState = baseChoiceState;

  try {
    if (isBackendOwnedCombatChoice(params.option)) {
      throw new Error(
        `战斗与物品动作必须由后端结算，禁止进入本地 continuation：${params.option.functionId}`,
      );
    }

    const history = baseChoiceState.storyHistory;
    const resolvedChoice = params.buildResolvedChoiceState(
      baseChoiceState,
      params.option,
      params.character,
    );
    if (
      resolvedChoice.optionKind === 'battle' ||
      resolvedChoice.optionKind === 'escape'
    ) {
      throw new Error(
        `战斗与逃脱动作必须由后端结算，禁止进入本地 continuation：${params.option.functionId}`,
      );
    }

    const projectedState = resolvedChoice.afterSequence;
    const projectedStateWithBattleReward = projectedState;
    fallbackState = projectedStateWithBattleReward;
    const projectedAvailableOptions = params.getAvailableOptionsForState(
      projectedStateWithBattleReward,
      params.character,
    );
    const combatResolutionContextText = null;
    const historyForStoryGeneration = combatResolutionContextText
      ? [
          ...history,
          createHistoryMoment(params.option.actionText, 'action'),
          createHistoryMoment(combatResolutionContextText, 'result'),
        ]
      : history;

    const responsePromise = generateNextStep(
      params.gameState.worldType!,
      params.character,
      params.getStoryGenerationHostileNpcs(projectedStateWithBattleReward),
      historyForStoryGeneration,
      params.option.actionText,
      params.buildStoryContextFromState(projectedStateWithBattleReward, {
        lastFunctionId: params.option.functionId,
        observeSignsRequested:
          params.option.functionId === 'idle_observe_signs',
        recentActionResult: combatResolutionContextText,
        currentStory: params.currentStory,
      }),
      projectedAvailableOptions
        ? { availableOptions: projectedAvailableOptions }
        : undefined,
    );
    const actionPromise = params.playResolvedChoice(
      baseChoiceState,
      params.option,
      params.character,
      resolvedChoice,
    );
    const [actionResult, responseResult] = await Promise.allSettled([
      actionPromise,
      responsePromise,
    ]);

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

    const afterSequence = actionResult.value;
    fallbackState = afterSequence;

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

    const response = responseResult.value!;
    const nextHistory = combatResolutionContextText
      ? [
          ...historyForStoryGeneration,
          createHistoryMoment(response.storyText, 'result', response.options),
        ]
      : [
          ...baseChoiceState.storyHistory,
          createHistoryMoment(params.option.actionText, 'action'),
          createHistoryMoment(response.storyText, 'result', response.options),
        ];

    const nextState = params.incrementRuntimeStats(
      {
        ...afterSequence,
        lastObserveSignsSceneId:
          params.option.functionId === 'idle_observe_signs'
            ? (afterSequence.currentScenePreset?.id ?? null)
            : (afterSequence.lastObserveSignsSceneId ?? null),
        lastObserveSignsReport:
          params.option.functionId === 'idle_observe_signs'
            ? response.storyText
            : (afterSequence.lastObserveSignsReport ?? null),
        storyHistory: nextHistory,
      },
      {},
    );

    const recoveredState = applyStoryReasoningRecovery(nextState);
    params.setGameState(recoveredState);

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