'use strict';

const { ensureObjectPayload, toInt } = require('./helpers');
const {
   sanitizeQueryBlockConfig,
   buildChartSnapshotPayload,
   buildTableSnapshotPayload,
   buildKpiSnapshotPayload,
} = require('./chartSnapshot');
const { analyzeBlockSnapshotWithPrompt } = require('./ai');

const normalizeOptionalString = value => {
   const normalized = String(value || '').trim();
   return normalized || null;
};

const deepCloneJson = value => {
   if (value === null || value === undefined) return value;
   return JSON.parse(JSON.stringify(value));
};

const rewriteAiAnalysisConfig = (config = {}, blockIdMap = null) => {
   const nextConfig = deepCloneJson(config) || {};
   if (!(blockIdMap instanceof Map) || !blockIdMap.size) {
      return sanitizeQueryBlockConfig(nextConfig);
   }

   const sourceTemplateBlockId = toInt(
      nextConfig.sourceTemplateBlockId || nextConfig.sourceBlockId || nextConfig.linkedBlockId
   );
   if (!sourceTemplateBlockId) return sanitizeQueryBlockConfig(nextConfig);

   const resolvedBlockId = blockIdMap.get(String(sourceTemplateBlockId));
   if (resolvedBlockId) {
      nextConfig.sourceBlockId = resolvedBlockId;
      nextConfig.linkedBlockId = resolvedBlockId;
   }
   delete nextConfig.sourceTemplateBlockId;
   return sanitizeQueryBlockConfig(nextConfig);
};

const resolveBlockPayload = async (ctx, options = {}) => {
   const normalizedBlockType = String(options?.blockType || 'text').trim().toLowerCase();
   const safeConfig = ensureObjectPayload(options?.config || {}, 'config');
   const safeSnapshot = deepCloneJson(options?.contentSnapshot) || null;
   const dataSourceId = toInt(options?.dataSourceId);
   const transaction = options?.transaction || null;

   if (normalizedBlockType === 'chart') {
      if (!dataSourceId) throw '缺少参数: dataSourceId';
      return buildChartSnapshotPayload(
         ctx,
         dataSourceId,
         safeConfig,
         transaction,
         safeSnapshot
      );
   }

   if (normalizedBlockType === 'table') {
      if (!dataSourceId) throw '缺少参数: dataSourceId';
      return buildTableSnapshotPayload(ctx, dataSourceId, safeConfig, transaction);
   }

   if (normalizedBlockType === 'kpi') {
      if (!dataSourceId) throw '缺少参数: dataSourceId';
      return buildKpiSnapshotPayload(ctx, dataSourceId, safeConfig, transaction);
   }

   return {
      config: sanitizeQueryBlockConfig(safeConfig),
      contentSnapshot: safeSnapshot,
   };
};

const finalizeResolvedBlockPayload = async (ctx, options = {}) => {
   const normalizedBlockType = String(options?.blockType || 'text').trim().toLowerCase();
   const baseConfig = ensureObjectPayload(options?.config || {}, 'config');
   const safeSnapshot = deepCloneJson(options?.contentSnapshot) || null;

   if (normalizedBlockType !== 'ai_analysis') {
      return {
         config: sanitizeQueryBlockConfig(baseConfig),
         contentSnapshot: safeSnapshot,
      };
   }

   const rewrittenConfig = rewriteAiAnalysisConfig(baseConfig, options?.blockIdMap || null);
   const sourceBlockId = toInt(rewrittenConfig.sourceBlockId || rewrittenConfig.linkedBlockId);
   const prompt = normalizeOptionalString(rewrittenConfig.prompt);
   if (!sourceBlockId || !prompt || typeof options?.getCreatedBlockStateByInstanceId !== 'function') {
      return {
         config: rewrittenConfig,
         contentSnapshot: safeSnapshot,
      };
   }

   const sourceBlockState = options.getCreatedBlockStateByInstanceId(sourceBlockId);
   if (!sourceBlockState) {
      return {
         config: rewrittenConfig,
         contentSnapshot: safeSnapshot,
      };
   }

   let content = '';
   try {
      content = await analyzeBlockSnapshotWithPrompt(ctx, {
         actionId: `report-block:${sourceBlockState.createdId || sourceBlockId}`,
         prompt,
         sourceBlock: {
            id: sourceBlockState.createdId || sourceBlockId,
            blockType: sourceBlockState.blockType,
            config: sourceBlockState.config || {},
            contentSnapshot: sourceBlockState.contentSnapshot || null,
         },
      });
   } catch (error) {
      content = normalizeOptionalString(safeSnapshot?.content)
         || `AI 分析生成失败: ${error?.message || error || '未知错误'}`;
   }

   return {
      config: rewrittenConfig,
      contentSnapshot: {
         kind: 'ai_analysis',
         content,
      },
   };
};

module.exports = {
   resolveBlockPayload,
   finalizeResolvedBlockPayload,
   rewriteAiAnalysisConfig,
};