import {
  collectOwnPublicHtmlArtifactRefs,
  materializePublicHtmlWritesFromSessionEvent,
  syncPublicHtmlAfterFinish,
} from './mindspace-public-finish-sync.mjs';
import {
  buildMindSpacePublicUrlForUser,
  resolveMindSpaceUserPublishDir,
} from './mindspace-runtime-config.mjs';
import {
  evaluateH5HtmlFinishGuard,
} from './mindspace-h5-html-finish-guard.mjs';
import {
  buildPageDataDeliveryArtifactsFromBindResult,
  ensurePageDataDeliveryReady,
  maybeAutoBindPageDataHtmlPages,
  preparePageDataAfterFinish,
  resolvePageDataCollectOutcomeAsync,
  rewritePageDataDeliveryLinks,
} from './mindspace-page-data-finish-guard.mjs';
import {
  createPageService,
} from './mindspace-pages.mjs';
import {
  ensureWechatFreshPageThumbnailsAtWorkspace,
  prepareWechatHtmlDeliveryAtWorkspace,
} from './mindspace-wechat-html-delivery.mjs';

function eventMessages(event, recentCount) {
  if (event?.type === 'Message' && event.message) {
    return [event.message];
  }
  if (
    event?.type === 'UpdateConversation' &&
    Array.isArray(event.conversation)
  ) {
    return event.conversation.slice(
      -Math.max(1, recentCount),
    );
  }
  return [];
}

function sanitizePageDataPreparation(value) {
  if (!value) return null;
  return JSON.parse(
    JSON.stringify(value, (key, item) => {
      if (
        [
          'absolutePath',
          'content',
          'localPath',
        ].includes(key)
      ) {
        return undefined;
      }
      if (item instanceof Map) {
        return Object.fromEntries(item);
      }
      return item;
    }),
  );
}

export function createMindSpacePublicFinishService({
  pool,
  h5Root,
  storageRoot,
  env = process.env,
  syncWorkspaceAssets = null,
  conversationArtifactService,
  resolveMindSpaceUserPublishDirFn =
    resolveMindSpaceUserPublishDir,
  buildMindSpacePublicUrlForUserFn =
    buildMindSpacePublicUrlForUser,
  materializeSessionEventFn =
    materializePublicHtmlWritesFromSessionEvent,
  collectArtifactRefsFn =
    collectOwnPublicHtmlArtifactRefs,
  syncAfterFinishFn = syncPublicHtmlAfterFinish,
  evaluateH5HtmlFinishGuardFn =
    evaluateH5HtmlFinishGuard,
  preparePageDataAfterFinishFn =
    preparePageDataAfterFinish,
  resolvePageDataCollectOutcomeAsyncFn =
    resolvePageDataCollectOutcomeAsync,
  maybeAutoBindPageDataHtmlPagesFn =
    maybeAutoBindPageDataHtmlPages,
  buildPageDataDeliveryArtifactsFromBindResultFn =
    buildPageDataDeliveryArtifactsFromBindResult,
  ensurePageDataDeliveryReadyFn =
    ensurePageDataDeliveryReady,
  rewritePageDataDeliveryLinksFn =
    rewritePageDataDeliveryLinks,
  createPageServiceFn = createPageService,
  prepareWechatHtmlDeliveryAtWorkspaceFn =
    prepareWechatHtmlDeliveryAtWorkspace,
  ensureWechatFreshPageThumbnailsAtWorkspaceFn =
    ensureWechatFreshPageThumbnailsAtWorkspace,
} = {}) {
  if (
    !pool ||
    typeof pool.query !== 'function' ||
    !h5Root ||
    !storageRoot
  ) {
    throw new Error(
      'createMindSpacePublicFinishService requires pool, h5Root, and storageRoot',
    );
  }
  if (
    !conversationArtifactService ||
    typeof conversationArtifactService
      .registerPublicHtmlArtifacts !== 'function'
  ) {
    throw new Error(
      'createMindSpacePublicFinishService requires conversationArtifactService',
    );
  }

  const resolveContext = (userId) => {
    const normalizedUserId = String(userId ?? '').trim();
    if (!normalizedUserId) {
      throw Object.assign(
        new Error('MindSpace public finish requires userId'),
        { code: 'invalid_input' },
      );
    }
    const currentUser = { id: normalizedUserId };
    return {
      currentUser,
      publishDir: resolveMindSpaceUserPublishDirFn(
        h5Root,
        currentUser,
      ),
    };
  };

  const attachCanonicalUrls = (result, currentUser) => {
    const artifactRefs = Array.isArray(
      result?.publicHtmlArtifactRefs,
    )
      ? result.publicHtmlArtifactRefs
      : [];
    return {
      ...result,
      publicHtmlArtifacts: artifactRefs.map((ref) => ({
        ...ref,
        canonicalUrl: buildMindSpacePublicUrlForUserFn({
          h5Root,
          env,
          user: currentUser,
          relativePath: ref.relativePath,
        }),
      })),
    };
  };

  const buildCanonicalUrl = (
    currentUser,
    relativePath,
  ) =>
    buildMindSpacePublicUrlForUserFn({
      h5Root,
      env,
      user: currentUser,
      relativePath,
    });

  const syncAndRegisterWechatArtifacts = async ({
    currentUser,
    sessionId,
    relativePaths,
  }) => {
    const normalizedRelativePaths = [
      ...new Set(
        relativePaths
          .map((value) =>
            String(value ?? '').trim(),
          )
          .filter(Boolean),
      ),
    ];
    if (normalizedRelativePaths.length === 0) {
      return;
    }
    if (
      typeof syncWorkspaceAssets === 'function'
    ) {
      await syncWorkspaceAssets(currentUser.id, {
        categoryCode: 'public',
        sourceSessionId:
          String(sessionId ?? '').trim() ||
          null,
        onlyRelativePaths:
          normalizedRelativePaths,
      });
    }
    if (String(sessionId ?? '').trim()) {
      await conversationArtifactService
        .registerPublicHtmlArtifacts({
          userId: currentUser.id,
          sessionId,
          relativePaths:
            normalizedRelativePaths.filter(
              (relativePath) =>
                relativePath
                  .toLowerCase()
                  .endsWith('.html'),
            ),
        });
    }
  };

  const preparePageDataForUser = async ({
    userId,
    messages,
    userText = '',
  } = {}) => {
    const { currentUser, publishDir } =
      resolveContext(userId);
    return sanitizePageDataPreparation(
      await preparePageDataAfterFinishFn({
        userId: currentUser.id,
        publishDir,
        messages,
        pool,
        h5Root,
        storageRoot,
        userText,
      }),
    );
  };

  const prepareWechatPageDataForUser = async ({
    userId,
    reply = null,
    intent = null,
    publicBaseUrl = null,
    requestStartedAt = 0,
  } = {}) => {
    const { currentUser, publishDir } =
      resolveContext(userId);
    const normalizedReply = {
      text: String(reply?.text ?? ''),
      messages: Array.isArray(reply?.messages)
        ? reply.messages
        : [],
    };
    const normalizedIntent = {
      agentText: String(intent?.agentText ?? ''),
      displayText: String(
        intent?.displayText ?? '',
      ),
    };
    let outcome =
      await resolvePageDataCollectOutcomeAsyncFn({
        reply: normalizedReply,
        intent: normalizedIntent,
        publishDir,
        requestStartedAt,
        pool,
        userId: currentUser.id,
        findPageByRelativePath: null,
        apiBase: publicBaseUrl,
      });
    let autoBind = null;
    if (outcome?.action === 'skip') {
      return sanitizePageDataPreparation({
        outcome,
        autoBind,
        deliveryArtifacts: [],
        deliveryCheck: null,
        rewrittenText: normalizedReply.text,
      });
    }

    const pageService = createPageServiceFn(pool, {
      h5Root,
      storageRoot,
    });
    const findPageByRelativePath =
      pageService.findPageByRelativePath.bind(
        pageService,
      );
    autoBind =
      await maybeAutoBindPageDataHtmlPagesFn({
        pool,
        userId: currentUser.id,
        publishDir,
        h5Root,
        storageRoot,
        findPageByRelativePath,
      });
    outcome =
      await resolvePageDataCollectOutcomeAsyncFn({
        reply: normalizedReply,
        intent: normalizedIntent,
        publishDir,
        requestStartedAt,
        pool,
        userId: currentUser.id,
        findPageByRelativePath,
        apiBase: publicBaseUrl,
      });

    let deliveryArtifacts = [];
    let deliveryCheck = null;
    let rewrittenText = normalizedReply.text;
    if (outcome?.action === 'send') {
      deliveryArtifacts =
        buildPageDataDeliveryArtifactsFromBindResultFn(
          autoBind,
          publishDir,
          { publicBaseUrl },
        );
      if (deliveryArtifacts.length > 0) {
        deliveryCheck =
          await ensurePageDataDeliveryReadyFn({
            publishDir,
            userId: currentUser.id,
            pool,
            h5Root,
            storageRoot,
            apiBase: publicBaseUrl,
            artifacts: deliveryArtifacts,
          });
        rewrittenText =
          rewritePageDataDeliveryLinksFn(
            normalizedReply.text,
            deliveryArtifacts,
          );
      }
    }
    return sanitizePageDataPreparation({
      outcome,
      autoBind,
      deliveryArtifacts,
      deliveryCheck,
      rewrittenText,
    });
  };

  const prepareWechatHtmlForUser = async ({
    userId,
    sessionId = null,
    reply = null,
    intent = null,
    requestStartedAt = 0,
    allowRecentArtifacts = true,
  } = {}) => {
    const { currentUser, publishDir } =
      resolveContext(userId);
    const normalizedReply = {
      text: String(reply?.text ?? ''),
      messages: Array.isArray(reply?.messages)
        ? reply.messages
        : [],
    };
    const normalizedIntent = {
      agentText: String(
        intent?.agentText ?? '',
      ),
      displayText: String(
        intent?.displayText ?? '',
      ),
    };
    const prepared =
      prepareWechatHtmlDeliveryAtWorkspaceFn({
        reply: normalizedReply,
        intent: normalizedIntent,
        publishDir,
        requestStartedAt,
        allowRecentArtifacts:
          allowRecentArtifacts === true,
        buildCanonicalUrl: (relativePath) =>
          buildCanonicalUrl(
            currentUser,
            relativePath,
          ),
      });

    await syncAfterFinishFn({
      messages: normalizedReply.messages,
      currentUser,
      publishDir,
      sessionId,
      pool,
      storageRoot,
      h5Root,
      syncWorkspaceAssets,
      registerPublicHtmlArtifacts:
        (_registeredUserId, options) =>
          conversationArtifactService
            .registerPublicHtmlArtifacts({
              userId: currentUser.id,
              sessionId: options?.sessionId,
              relativePaths:
                options?.relativePaths,
              artifactRefs:
                options?.artifactRefs,
            }),
    });
    const confirmedRelativePaths =
      prepared.confirmedArtifacts.map(
        (artifact) => artifact.relativePath,
      );
    await syncAndRegisterWechatArtifacts({
      currentUser,
      sessionId,
      relativePaths: confirmedRelativePaths,
    });
    return prepared;
  };

  const ensureWechatFreshPageThumbnailsForUser =
    async ({
      userId,
      sessionId = null,
      artifacts = [],
      images = [],
      messages = [],
      repairEnabled = false,
    } = {}) => {
      const { currentUser, publishDir } =
        resolveContext(userId);
      const result =
        await ensureWechatFreshPageThumbnailsAtWorkspaceFn(
          {
            artifacts,
            images,
            messages: Array.isArray(messages)
              ? messages
              : [],
            publishDir,
            repairEnabled:
              repairEnabled === true,
            buildCanonicalUrl: (relativePath) =>
              buildCanonicalUrl(
                currentUser,
                relativePath,
              ),
          },
        );
      if (result.ok) {
        await syncAndRegisterWechatArtifacts({
          currentUser,
          sessionId,
          relativePaths: [
            ...result.matchRelativePaths,
            ...result.thumbnailRelativePaths,
          ],
        });
      }
      return result;
    };

  return {
    async materializeSessionEvent({
      userId,
      event,
      recentCount = 20,
    } = {}) {
      const { currentUser, publishDir } =
        resolveContext(userId);
      const result = materializeSessionEventFn(event, {
        publishDir,
        recentCount,
      });
      const publicHtmlArtifactRefs = collectArtifactRefsFn({
        messages: eventMessages(event, recentCount),
        currentUser,
        publishDir,
        materialized: result?.materialized,
        skipped: result?.skipped,
      });
      return attachCanonicalUrls(
        {
          ...result,
          publicHtmlRelativePaths:
            publicHtmlArtifactRefs.map(
              (ref) => ref.relativePath,
            ),
          publicHtmlArtifactRefs,
        },
        currentUser,
      );
    },

    async syncAfterFinish({
      userId,
      sessionId,
      messages,
      currentUser: suppliedCurrentUser = null,
    } = {}) {
      const { currentUser, publishDir } =
        resolveContext(userId);
      const result = await syncAfterFinishFn({
        messages,
        currentUser,
        publishDir,
        sessionId,
        pool,
        storageRoot,
        h5Root,
        syncWorkspaceAssets,
        registerPublicHtmlArtifacts:
          (_registeredUserId, options) =>
            conversationArtifactService
              .registerPublicHtmlArtifacts({
                userId: currentUser.id,
                sessionId: options?.sessionId,
                relativePaths: options?.relativePaths,
                artifactRefs: options?.artifactRefs,
              }),
      });
      const evaluated =
        evaluateH5HtmlFinishGuardFn({
          messages,
          currentUser: {
            ...suppliedCurrentUser,
            id: currentUser.id,
          },
          publishDir,
          syncResult: result,
        });
      const {
        linkExists: _linkExists,
        ...deliveryEvaluation
      } = evaluated ?? {};
      return attachCanonicalUrls(
        {
          ...result,
          deliveryEvaluation,
        },
        currentUser,
      );
    },

    preparePageDataAfterFinish:
      preparePageDataForUser,

    prepareWechatPageDataDelivery:
      prepareWechatPageDataForUser,

    prepareWechatHtmlDelivery:
      prepareWechatHtmlForUser,

    ensureWechatFreshPageThumbnails:
      ensureWechatFreshPageThumbnailsForUser,
  };
}

export const mindSpacePublicFinishServiceInternals = {
  eventMessages,
  sanitizePageDataPreparation,
};