import db from '../config/database';
import { logger } from '../utils/logger';
import { DecisionExplainabilityEngine } from '../core/ai/DecisionExplainabilityEngine';

/**
 * [BIZ_OPS_149] SKU 属性缺失导致的转化率流失分析 (Metadata)
 * @description 核心逻辑：利用 AGI 对比竞品 SKU 属性，自动识别我方商品缺失的关键属性（如材质、尺寸、认证），并建议补全以提升 SEO 与转化率。
 */
export class ContentGapService {
  /**
   * 分析元数据缺失 (BIZ_OPS_149)
   */
  static async analyzeMetadataGaps(tenantId: string, productId: string): Promise<any> {
    logger.info(`[ContentGap] Analyzing metadata for Product: ${productId}, Tenant: ${tenantId}`);

    try {
      // 1. 获取商品当前属性 (模拟)
      const product = await db('cf_product').where({ id: productId }).first();
      const currentAttrs = ['Color', 'Size'];
      
      // 2. 模拟竞品属性对比 (AGI 推理)
      const competitorAttrs = ['Color', 'Size', 'Material', 'Certifications', 'Warranty'];
      const missingAttrs = competitorAttrs.filter(a => !currentAttrs.includes(a));

      if (missingAttrs.length > 0) {
        const estConversionLift = missingAttrs.length * 0.02; // 模拟每补全一个属性提升 2% 转化
        const advice = `CONTENT GAP DETECTED: Missing key attributes: [${missingAttrs.join(', ')}]. ` +
          `Completing these could lift conversion rate by approximately ${(estConversionLift * 100).toFixed(1)}%.`;

        // 3. [UX_XAI_01] 记录决策证据链
        await DecisionExplainabilityEngine.logDecision({
          tenantId,
          module: 'PRODUCT_CONTENT_OPTIMIZATION',
          resourceId: productId,
          decisionType: 'METADATA_GAP_ANALYSIS',
          causalChain: advice,
          factors: [
            { name: 'MissingAttributeCount', value: missingAttrs.length, weight: 0.7, impact: 'NEGATIVE' },
            { name: 'ExpectedLift', value: estConversionLift, weight: 0.3, impact: 'POSITIVE' }
          ],
          traceId: 'content-gap-' + Date.now()
        });

        return { success: true, missingAttrs, estConversionLift, advice, status: 'PENDING_REVIEW' };
      }

      return { success: true, message: 'Content is comprehensive' };
    } catch (err: any) {
      logger.error(`[ContentGap][WARN] Analysis failed: ${err.message}`);
      return { success: false, error: err.message };
    }
  }
}
