/**
 * Pipeline Recommender Service
 *
 * Analyzes user messages to recommend relevant Pipelines.
 * Used by Agent conversation flow to proactively suggest workflows.
 */

import { PipelineInfo, PipelineClient } from './pipeline-client';

// === Types ===

export interface PipelineRecommendation {
  pipeline: PipelineInfo;
  confidence: number;  // 0-1
  matchedKeywords: string[];
  suggestedInputs: Record<string, unknown>;
  reason: string;
}

export interface IntentPattern {
  keywords: RegExp[];
  category?: string;
  pipelineId?: string;
  minConfidence: number;
  inputSuggestions?: (message: string) => Record<string, unknown>;
}

// === Intent Patterns ===

const INTENT_PATTERNS: IntentPattern[] = [
  // Education - Classroom
  {
    keywords: [
      /课件|教案|备课|课堂|教学|ppt|幻灯片/i,
      /上课|讲课|教材/i,
      /生成.*课件|制作.*课件|创建.*课件/i,
    ],
    category: 'education',
    pipelineId: 'classroom-generator',
    minConfidence: 0.75,
  },

  // Marketing - Campaign
  {
    keywords: [
      /营销|推广|宣传|市场.*方案|营销.*策略/i,
      /产品.*推广|品牌.*宣传/i,
      /广告.*方案|营销.*计划/i,
      /生成.*营销|制作.*营销/i,
    ],
    category: 'marketing',
    pipelineId: 'marketing-campaign',
    minConfidence: 0.72,
  },

  // Legal - Contract Review
  {
    keywords: [
      /合同.*审查|合同.*风险|合同.*检查/i,
      /审查.*合同|检查.*合同|分析.*合同/i,
      /法律.*审查|合规.*检查/i,
      /合同.*条款|条款.*风险/i,
    ],
    category: 'legal',
    pipelineId: 'contract-review',
    minConfidence: 0.78,
  },

  // Research - Literature Review
  {
    keywords: [
      /文献.*综述|文献.*分析|文献.*检索/i,
      /研究.*综述|学术.*综述/i,
      /论文.*综述|论文.*调研/i,
      /文献.*搜索|文献.*查找/i,
    ],
    category: 'research',
    pipelineId: 'literature-review',
    minConfidence: 0.73,
  },

  // Productivity - Meeting Summary
  {
    keywords: [
      /会议.*纪要|会议.*总结|会议.*记录/i,
      /整理.*会议|总结.*会议/i,
      /会议.*整理|纪要.*生成/i,
      /待办.*事项|行动.*项/i,
    ],
    category: 'productivity',
    pipelineId: 'meeting-summary',
    minConfidence: 0.70,
  },

  // Generic patterns for each category
  {
    keywords: [/帮我.*生成|帮我.*制作|帮我.*创建|自动.*生成/i],
    minConfidence: 0.5,
  },
];

// === Pipeline Recommender Class ===

export class PipelineRecommender {
  private pipelines: PipelineInfo[] = [];
  private initialized = false;

  /**
   * Initialize the recommender by loading pipelines
   */
  async initialize(): Promise<void> {
    if (this.initialized) return;

    try {
      this.pipelines = await PipelineClient.listPipelines();
      this.initialized = true;
    } catch (error) {
      console.error('[PipelineRecommender] Failed to load pipelines:', error);
    }
  }

  /**
   * Refresh pipeline list
   */
  async refresh(): Promise<void> {
    try {
      this.pipelines = await PipelineClient.refresh();
    } catch (error) {
      console.error('[PipelineRecommender] Failed to refresh pipelines:', error);
    }
  }

  /**
   * Analyze a user message and return pipeline recommendations
   */
  async recommend(message: string): Promise<PipelineRecommendation[]> {
    if (!this.initialized) {
      await this.initialize();
    }

    const recommendations: PipelineRecommendation[] = [];
    const messageLower = message.toLowerCase();

    for (const pattern of INTENT_PATTERNS) {
      const matches = pattern.keywords
        .map(regex => regex.test(message))
        .filter(Boolean);

      if (matches.length === 0) continue;

      const confidence = Math.min(
        pattern.minConfidence + (matches.length - 1) * 0.05,
        0.95
      );

      // Find matching pipeline
      let matchingPipelines: PipelineInfo[] = [];

      if (pattern.pipelineId) {
        matchingPipelines = this.pipelines.filter(p => p.id === pattern.pipelineId);
      } else if (pattern.category) {
        matchingPipelines = this.pipelines.filter(p => p.category === pattern.category);
      }

      // If no specific pipeline found, recommend based on category or all
      if (matchingPipelines.length === 0 && !pattern.pipelineId && !pattern.category) {
        // Generic match - recommend top pipelines
        matchingPipelines = this.pipelines.slice(0, 3);
      }

      for (const pipeline of matchingPipelines) {
        const matchedKeywords = pattern.keywords
          .filter(regex => regex.test(message))
          .map(regex => regex.source);

        const suggestion: PipelineRecommendation = {
          pipeline,
          confidence,
          matchedKeywords,
          suggestedInputs: pattern.inputSuggestions?.(message) ?? {},
          reason: this.generateReason(pipeline, matchedKeywords, confidence),
        };

        // Avoid duplicates
        if (!recommendations.find(r => r.pipeline.id === pipeline.id)) {
          recommendations.push(suggestion);
        }
      }
    }

    // Sort by confidence and return top recommendations
    return recommendations
      .sort((a, b) => b.confidence - a.confidence)
      .slice(0, 3);
  }

  /**
   * Generate a human-readable reason for the recommendation
   */
  private generateReason(
    pipeline: PipelineInfo,
    matchedKeywords: string[],
    confidence: number
  ): string {
    const confidenceText =
      confidence >= 0.8 ? '非常适合' :
      confidence >= 0.7 ? '适合' :
      confidence >= 0.6 ? '可能适合' : '或许可以尝试';

    if (matchedKeywords.length > 0) {
      return `您的需求与【${pipeline.displayName}】${confidenceText}。这个 Pipeline 可以帮助您自动化完成相关任务。`;
    }

    return `【${pipeline.displayName}】可能对您有帮助。需要我为您启动吗？`;
  }

  /**
   * Format recommendation for Agent message
   */
  formatRecommendationForAgent(rec: PipelineRecommendation): string {
    const pipeline = rec.pipeline;
    let message = `我可以使用【${pipeline.displayName}】为你自动完成这个任务。\n\n`;
    message += `**功能说明**: ${pipeline.description}\n\n`;

    if (Object.keys(rec.suggestedInputs).length > 0) {
      message += `**我已识别到以下信息**:\n`;
      for (const [key, value] of Object.entries(rec.suggestedInputs)) {
        message += `- ${key}: ${value}\n`;
      }
      message += '\n';
    }

    message += `需要开始吗？`;

    return message;
  }

  /**
   * Check if a message might benefit from a pipeline
   */
  mightNeedPipeline(message: string): boolean {
    const pipelineKeywords = [
      '生成', '创建', '制作', '分析', '审查', '整理',
      '总结', '归纳', '提取', '转换', '自动化',
      '帮我', '请帮我', '能不能', '可以',
    ];

    return pipelineKeywords.some(kw => message.includes(kw));
  }
}

// === Singleton Instance ===

export const pipelineRecommender = new PipelineRecommender();

// === React Hook ===

import { useState, useEffect, useCallback } from 'react';

export interface UsePipelineRecommendationOptions {
  autoInit?: boolean;
  minConfidence?: number;
}

export function usePipelineRecommendation(options: UsePipelineRecommendationOptions = {}) {
  const [recommender] = useState(() => new PipelineRecommender());
  const [initialized, setInitialized] = useState(false);
  const [loading, setLoading] = useState(false);

  useEffect(() => {
    if (options.autoInit !== false) {
      recommender.initialize().then(() => setInitialized(true));
    }
  }, [recommender, options.autoInit]);

  const recommend = useCallback(async (message: string) => {
    setLoading(true);
    try {
      const results = await recommender.recommend(message);
      const minConf = options.minConfidence ?? 0.6;
      return results.filter(r => r.confidence >= minConf);
    } finally {
      setLoading(false);
    }
  }, [recommender, options.minConfidence]);

  return {
    recommend,
    initialized,
    loading,
    refresh: recommender.refresh.bind(recommender),
    mightNeedPipeline: recommender.mightNeedPipeline,
    formatRecommendationForAgent: recommender.formatRecommendationForAgent.bind(recommender),
  };
}

export default pipelineRecommender;