import { Router } from 'express';
import { z } from 'zod';

import type {
  AnswerCustomWorldSessionQuestionRequest,
  CreateCustomWorldSessionRequest,
  CustomWorldGalleryDetailResponse,
  CustomWorldGalleryResponse,
  CustomWorldLibraryMutationResponse,
  CustomWorldLibraryResponse,
  RuntimeSettings,
  SavedGameSnapshotInput,
} from '../../../packages/shared/src/contracts/runtime.js';
import { CUSTOM_WORLD_GENERATION_MODES } from '../../../packages/shared/src/contracts/runtime.js';
import type {
  QuestGenerationRequest,
  RuntimeItemIntentRequest,
} from '../../../packages/shared/src/contracts/story.js';
import type {
  CharacterChatReplyRequest,
  CharacterChatSuggestionsRequest,
  CharacterChatSummaryRequest,
  NpcChatDialogueRequest,
  NpcRecruitDialogueRequest,
} from '../../../packages/shared/src/contracts/story.js';
import type { AppContext } from '../context.js';
import { badRequest, notFound } from '../errors.js';
import {
  asyncHandler,
  jsonClone,
  prepareEventStreamResponse,
  sendApiResponse,
} from '../http.js';
import { requireJwtAuth } from '../middleware/auth.js';
import { routeMeta } from '../middleware/routeMeta.js';
import {
  generateCharacterChatSuggestionsFromOrchestrator,
  generateCharacterChatSummaryFromOrchestrator,
  streamCharacterChatReplyFromOrchestrator,
  streamNpcChatDialogueFromOrchestrator,
  streamNpcRecruitDialogueFromOrchestrator,
} from '../modules/ai/chatOrchestrator.js';
import {
  hydrateSavedSnapshot,
  normalizeSavedSnapshotPayload,
} from '../modules/runtime/runtimeSnapshotHydration.js';
import {
  characterChatReplyRequestSchema,
  characterChatSuggestionsRequestSchema,
  characterChatSummaryRequestSchema,
  npcChatDialogueRequestSchema,
  npcRecruitDialogueRequestSchema,
} from '../services/chatService.js';
import { generateCustomWorldProfile } from '../services/customWorldGenerationService.js';
import { generateQuestForNpcEncounter } from '../services/questService.js';
import { generateRuntimeItemIntents } from '../services/runtimeItemService.js';
import {
  generateSceneImage,
  sceneImageSchema,
} from '../services/sceneImageService.js';
import {
  generateHighQualityInitialStory,
  generateHighQualityNextStory,
  parseStoryRequest,
} from '../services/storyService.js';

const jsonObjectSchema = z.record(z.string(), z.unknown());

const saveSnapshotSchema = z.object({
  gameState: z.unknown(),
  bottomTab: z.string().trim().min(1),
  currentStory: z.unknown().nullable().optional().default(null),
  savedAt: z.string().trim().optional().default(''),
});

const settingsSchema = z.object({
  musicVolume: z.number().min(0).max(1),
});

const customWorldProfileSchema = z.object({
  profile: jsonObjectSchema,
});

const customWorldSessionSchema = z.object({
  settingText: z.string().trim().min(1),
  creatorIntent: jsonObjectSchema.nullable().optional().default(null),
  generationMode: z.enum(CUSTOM_WORLD_GENERATION_MODES).default('fast'),
});

const customWorldAnswerSchema = z.object({
  questionId: z.string().trim().min(1),
  answer: z.string().trim().min(1),
});

const runtimeItemIntentSchema = z.object({
  context: jsonObjectSchema,
  plans: z.array(jsonObjectSchema),
});

const questGenerationSchema = z.object({
  state: jsonObjectSchema,
  encounter: jsonObjectSchema,
});

const llmProxySchema = jsonObjectSchema;

function readParam(param: string | string[] | undefined) {
  return Array.isArray(param) ? param[0]?.trim() || '' : param?.trim() || '';
}

async function resolveAuthDisplayName(context: AppContext, userId: string) {
  const user = await context.userRepository.findById(userId);
  if (!user) {
    throw notFound('user not found');
  }

  return user.displayName?.trim() || '玩家';
}

export function createRuntimeRoutes(context: AppContext) {
  const router = Router();
  const requireAuth = requireJwtAuth(context.config, context.userRepository);

  router.use(requireAuth);

  router.post(
    '/llm/chat/completions',
    routeMeta({ operation: 'runtime.llm.chatCompletionsProxy' }),
    asyncHandler(async (request, response) => {
      const body = llmProxySchema.parse(request.body);
      await context.llmClient.forwardCompletion(request, body, response);
    }),
  );

  router.post(
    '/custom-world/scene-image',
    routeMeta({ operation: 'runtime.customWorld.sceneImage' }),
    asyncHandler(async (request, response) => {
      const payload = sceneImageSchema.parse(request.body);
      sendApiResponse(response, await generateSceneImage(context, payload));
    }),
  );

  router.get(
    '/runtime/save/snapshot',
    routeMeta({ operation: 'runtime.snapshot.get' }),
    asyncHandler(async (request, response) => {
      sendApiResponse(
        response,
        hydrateSavedSnapshot(
          await context.runtimeRepository.getSnapshot(request.userId!),
        ),
      );
    }),
  );

  router.put(
    '/runtime/save/snapshot',
    routeMeta({ operation: 'runtime.snapshot.put' }),
    asyncHandler(async (request, response) => {
      const payload = saveSnapshotSchema.parse(
        request.body,
      ) as SavedGameSnapshotInput;
      const normalizedSnapshot = normalizeSavedSnapshotPayload({
        savedAt: payload.savedAt || new Date().toISOString(),
        gameState: payload.gameState,
        bottomTab: payload.bottomTab,
        currentStory: payload.currentStory ?? null,
      });
      sendApiResponse(
        response,
        hydrateSavedSnapshot(
          await context.runtimeRepository.putSnapshot(
            request.userId!,
            normalizedSnapshot,
          ),
        ),
      );
    }),
  );

  router.delete(
    '/runtime/save/snapshot',
    routeMeta({ operation: 'runtime.snapshot.delete' }),
    asyncHandler(async (request, response) => {
      await context.runtimeRepository.deleteSnapshot(request.userId!);
      sendApiResponse(response, { ok: true });
    }),
  );

  router.get(
    '/runtime/settings',
    routeMeta({ operation: 'runtime.settings.get' }),
    asyncHandler(async (request, response) => {
      sendApiResponse(
        response,
        await context.runtimeRepository.getSettings(request.userId!),
      );
    }),
  );

  router.put(
    '/runtime/settings',
    routeMeta({ operation: 'runtime.settings.put' }),
    asyncHandler(async (request, response) => {
      const payload = settingsSchema.parse(request.body) as RuntimeSettings;
      sendApiResponse(
        response,
        await context.runtimeRepository.putSettings(request.userId!, payload),
      );
    }),
  );

  router.get(
    '/runtime/custom-world-library',
    routeMeta({ operation: 'runtime.customWorldLibrary.list' }),
    asyncHandler(async (request, response) => {
      sendApiResponse(
        response,
        {
          entries: await context.runtimeRepository.listCustomWorldProfiles(
            request.userId!,
          ),
        } satisfies CustomWorldLibraryResponse,
      );
    }),
  );

  router.get(
    '/runtime/custom-world-gallery',
    routeMeta({ operation: 'runtime.customWorldGallery.list' }),
    asyncHandler(async (_request, response) => {
      sendApiResponse(
        response,
        {
          entries: await context.runtimeRepository.listPublishedCustomWorldGallery(),
        } satisfies CustomWorldGalleryResponse,
      );
    }),
  );

  router.get(
    '/runtime/custom-world-gallery/:ownerUserId/:profileId',
    routeMeta({ operation: 'runtime.customWorldGallery.detail' }),
    asyncHandler(async (request, response) => {
      const ownerUserId = readParam(request.params.ownerUserId);
      const profileId = readParam(request.params.profileId);
      if (!ownerUserId || !profileId) {
        throw badRequest('ownerUserId and profileId are required');
      }

      const entry =
        await context.runtimeRepository.getPublishedCustomWorldGalleryDetail(
          ownerUserId,
          profileId,
        );
      if (!entry) {
        throw notFound('public custom world not found');
      }

      sendApiResponse(
        response,
        {
          entry,
        } satisfies CustomWorldGalleryDetailResponse,
      );
    }),
  );

  router.put(
    '/runtime/custom-world-library/:profileId',
    routeMeta({ operation: 'runtime.customWorldLibrary.upsert' }),
    asyncHandler(async (request, response) => {
      const profileId = readParam(request.params.profileId);
      if (!profileId) {
        throw badRequest('profileId is required');
      }
      const payload = customWorldProfileSchema.parse(request.body);
      const authorDisplayName = await resolveAuthDisplayName(
        context,
        request.userId!,
      );
      sendApiResponse(
        response,
        await context.runtimeRepository.upsertCustomWorldProfile(
          request.userId!,
          profileId,
          jsonClone(payload.profile),
          authorDisplayName,
        ),
      );
    }),
  );

  router.delete(
    '/runtime/custom-world-library/:profileId',
    routeMeta({ operation: 'runtime.customWorldLibrary.delete' }),
    asyncHandler(async (request, response) => {
      const profileId = readParam(request.params.profileId);
      if (!profileId) {
        throw badRequest('profileId is required');
      }
      sendApiResponse(
        response,
        {
          entries: await context.runtimeRepository.deleteCustomWorldProfile(
            request.userId!,
            profileId,
          ),
        } satisfies CustomWorldLibraryResponse,
      );
    }),
  );

  router.post(
    '/runtime/custom-world-library/:profileId/publish',
    routeMeta({ operation: 'runtime.customWorldLibrary.publish' }),
    asyncHandler(async (request, response) => {
      const profileId = readParam(request.params.profileId);
      if (!profileId) {
        throw badRequest('profileId is required');
      }

      const authorDisplayName = await resolveAuthDisplayName(
        context,
        request.userId!,
      );
      const mutation =
        await context.runtimeRepository.publishCustomWorldProfile(
          request.userId!,
          profileId,
          authorDisplayName,
        );
      if (!mutation) {
        throw notFound('custom world not found');
      }

      sendApiResponse(
        response,
        mutation satisfies CustomWorldLibraryMutationResponse,
      );
    }),
  );

  router.post(
    '/runtime/custom-world-library/:profileId/unpublish',
    routeMeta({ operation: 'runtime.customWorldLibrary.unpublish' }),
    asyncHandler(async (request, response) => {
      const profileId = readParam(request.params.profileId);
      if (!profileId) {
        throw badRequest('profileId is required');
      }

      const authorDisplayName = await resolveAuthDisplayName(
        context,
        request.userId!,
      );
      const mutation =
        await context.runtimeRepository.unpublishCustomWorldProfile(
          request.userId!,
          profileId,
          authorDisplayName,
        );
      if (!mutation) {
        throw notFound('custom world not found');
      }

      sendApiResponse(
        response,
        mutation satisfies CustomWorldLibraryMutationResponse,
      );
    }),
  );

  router.post(
    '/runtime/story/initial',
    routeMeta({ operation: 'runtime.story.initial' }),
    asyncHandler(async (request, response) => {
      const payload = parseStoryRequest(request.body);
      sendApiResponse(
        response,
        await generateHighQualityInitialStory(context.llmClient, payload),
      );
    }),
  );

  router.post(
    '/runtime/story/continue',
    routeMeta({ operation: 'runtime.story.continue' }),
    asyncHandler(async (request, response) => {
      const payload = parseStoryRequest(request.body);
      sendApiResponse(
        response,
        await generateHighQualityNextStory(context.llmClient, payload),
      );
    }),
  );

  router.post(
    '/runtime/chat/character/suggestions',
    routeMeta({ operation: 'runtime.chat.character.suggestions' }),
    asyncHandler(async (request, response) => {
      const payload = characterChatSuggestionsRequestSchema.parse(
        request.body,
      ) as CharacterChatSuggestionsRequest;
      sendApiResponse(response, {
        text: await generateCharacterChatSuggestionsFromOrchestrator(
          context.llmClient,
          payload,
        ),
      });
    }),
  );

  router.post(
    '/runtime/chat/character/summary',
    routeMeta({ operation: 'runtime.chat.character.summary' }),
    asyncHandler(async (request, response) => {
      const payload = characterChatSummaryRequestSchema.parse(
        request.body,
      ) as CharacterChatSummaryRequest;
      sendApiResponse(response, {
        text: await generateCharacterChatSummaryFromOrchestrator(
          context.llmClient,
          payload,
        ),
      });
    }),
  );

  router.post(
    '/runtime/chat/character/reply/stream',
    routeMeta({ operation: 'runtime.chat.character.replyStream' }),
    asyncHandler(async (request, response) => {
      const payload = characterChatReplyRequestSchema.parse(
        request.body,
      ) as CharacterChatReplyRequest;
      await streamCharacterChatReplyFromOrchestrator(context.llmClient, {
        request,
        response,
        payload,
      });
    }),
  );

  router.post(
    '/runtime/chat/npc/dialogue/stream',
    routeMeta({ operation: 'runtime.chat.npc.dialogueStream' }),
    asyncHandler(async (request, response) => {
      const payload = npcChatDialogueRequestSchema.parse(
        request.body,
      ) as NpcChatDialogueRequest;
      await streamNpcChatDialogueFromOrchestrator(context.llmClient, {
        request,
        response,
        payload,
      });
    }),
  );

  router.post(
    '/runtime/chat/npc/recruit/stream',
    routeMeta({ operation: 'runtime.chat.npc.recruitStream' }),
    asyncHandler(async (request, response) => {
      const payload = npcRecruitDialogueRequestSchema.parse(
        request.body,
      ) as NpcRecruitDialogueRequest;
      await streamNpcRecruitDialogueFromOrchestrator(context.llmClient, {
        request,
        response,
        payload,
      });
    }),
  );

  router.post(
    '/runtime/custom-world/sessions',
    routeMeta({ operation: 'runtime.customWorldSession.create' }),
    asyncHandler(async (request, response) => {
      const payload = customWorldSessionSchema.parse(
        request.body,
      ) as CreateCustomWorldSessionRequest;
      sendApiResponse(
        response,
        context.customWorldSessions.create(
          request.userId!,
          payload.settingText,
          payload.creatorIntent,
          payload.generationMode,
        ),
      );
    }),
  );

  router.get(
    '/runtime/custom-world/sessions/:sessionId',
    routeMeta({ operation: 'runtime.customWorldSession.get' }),
    asyncHandler(async (request, response) => {
      const session = context.customWorldSessions.get(
        request.userId!,
        readParam(request.params.sessionId),
      );
      if (!session) {
        throw notFound('custom world session not found');
      }
      sendApiResponse(response, session);
    }),
  );

  router.post(
    '/runtime/custom-world/sessions/:sessionId/answers',
    routeMeta({ operation: 'runtime.customWorldSession.answer' }),
    asyncHandler(async (request, response) => {
      const payload = customWorldAnswerSchema.parse(
        request.body,
      ) as AnswerCustomWorldSessionQuestionRequest;
      const session = context.customWorldSessions.answer(
        request.userId!,
        readParam(request.params.sessionId),
        payload.questionId,
        payload.answer,
      );
      if (!session) {
        throw notFound('custom world session not found');
      }
      sendApiResponse(response, session);
    }),
  );

  router.get(
    '/runtime/custom-world/sessions/:sessionId/generate/stream',
    routeMeta({ operation: 'runtime.customWorldSession.generateStream' }),
    asyncHandler(async (request, response) => {
      const session = context.customWorldSessions.get(
        request.userId!,
        readParam(request.params.sessionId),
      );
      if (!session) {
        throw notFound('custom world session not found');
      }

      prepareEventStreamResponse(request, response);
      const controller = new AbortController();

      request.on('close', () => {
        controller.abort();
      });

      const writeEvent = (event: string, payload: Record<string, unknown>) => {
        response.write(`event: ${event}\n`);
        response.write(`data: ${JSON.stringify(payload)}\n\n`);
      };

      writeEvent('progress', { phase: 'preparing', progress: 10 });
      context.customWorldSessions.updateStatus(
        request.userId!,
        readParam(request.params.sessionId),
        'generating',
      );
      writeEvent('progress', { phase: 'requesting_llm', progress: 45 });

      try {
        const profile = await generateCustomWorldProfile(context, session, {
          signal: controller.signal,
          onProgress: (progress) => {
            writeEvent(
              'progress',
              progress as unknown as Record<string, unknown>,
            );
          },
        });
        context.customWorldSessions.setResult(
          request.userId!,
          readParam(request.params.sessionId),
          profile,
        );
        writeEvent('progress', { phase: 'completed', progress: 100 });
        writeEvent('result', { profile });
        writeEvent('done', { ok: true });
      } catch (error) {
        const message =
          error instanceof Error
            ? error.message
            : 'custom world generation failed';
        context.customWorldSessions.updateStatus(
          request.userId!,
          readParam(request.params.sessionId),
          'generation_error',
          message,
        );
        writeEvent('error', { message });
      } finally {
        response.end();
      }
    }),
  );

  router.post(
    '/runtime/items/runtime-intent',
    routeMeta({ operation: 'runtime.items.intent' }),
    asyncHandler(async (request, response) => {
      const payload = runtimeItemIntentSchema.parse(
        request.body,
      ) as RuntimeItemIntentRequest;
      sendApiResponse(response, {
        intents: await generateRuntimeItemIntents(context.llmClient, payload),
      });
    }),
  );

  router.post(
    '/runtime/quests/generate',
    routeMeta({ operation: 'runtime.quests.generate' }),
    asyncHandler(async (request, response) => {
      const payload = questGenerationSchema.parse(
        request.body,
      ) as QuestGenerationRequest;
      sendApiResponse(
        response,
        await generateQuestForNpcEncounter(context.llmClient, payload),
      );
    }),
  );

  router.get(
    '/ws/health',
    routeMeta({ operation: 'runtime.ws.health' }),
    (_request, response) => {
      sendApiResponse(response, {
        ok: true,
        message: 'websocket routes reserved for future real-time support',
      });
    },
  );

  return router;
}