/**
 * Protocol Context Service
 * 管理研究方案的上下文数据
 * 
 * @module agent/protocol/services/ProtocolContextService
 */

import { PrismaClient } from '@prisma/client';
import {
  ProtocolContextData,
  ProtocolStageCode,
  ScientificQuestionData,
  PICOData,
  StudyDesignData,
  SampleSizeData,
  EndpointsData,
} from '../../types/index.js';

export class ProtocolContextService {
  private prisma: PrismaClient;

  constructor(prisma: PrismaClient) {
    this.prisma = prisma;
  }

  /**
   * 获取或创建上下文
   */
  async getOrCreateContext(
    conversationId: string,
    userId: string
  ): Promise<ProtocolContextData> {
    let context = await this.getContext(conversationId);
    
    if (!context) {
      context = await this.createContext(conversationId, userId);
    }

    return context;
  }

  /**
   * 获取上下文
   */
  async getContext(conversationId: string): Promise<ProtocolContextData | null> {
    const result = await this.prisma.protocolContext.findUnique({
      where: { conversationId },
    });

    if (!result) return null;

    return this.mapToContextData(result);
  }

  /**
   * 创建新上下文
   */
  async createContext(
    conversationId: string,
    userId: string
  ): Promise<ProtocolContextData> {
    const result = await this.prisma.protocolContext.create({
      data: {
        conversationId,
        userId,
        currentStage: 'scientific_question',
        status: 'in_progress',
        completedStages: [],
      },
    });

    return this.mapToContextData(result);
  }

  /**
   * 更新阶段数据
   */
  async updateStageData(
    conversationId: string,
    stageCode: ProtocolStageCode,
    data: Record<string, unknown>
  ): Promise<ProtocolContextData> {
    const updateData: Record<string, unknown> = {};
    
    switch (stageCode) {
      case 'scientific_question':
        updateData.scientificQuestion = data;
        break;
      case 'pico':
        updateData.pico = data;
        break;
      case 'study_design':
        updateData.studyDesign = data;
        break;
      case 'sample_size':
        updateData.sampleSize = data;
        break;
      case 'endpoints':
        updateData.endpoints = data;
        break;
    }

    const result = await this.prisma.protocolContext.update({
      where: { conversationId },
      data: {
        ...updateData,
        lastActiveAt: new Date(),
      },
    });

    return this.mapToContextData(result);
  }

  /**
   * 标记阶段完成并更新当前阶段
   */
  async completeStage(
    conversationId: string,
    stageCode: ProtocolStageCode,
    nextStage?: ProtocolStageCode
  ): Promise<ProtocolContextData> {
    const context = await this.getContext(conversationId);
    if (!context) {
      throw new Error('Context not found');
    }

    const completedStages = [...context.completedStages];
    if (!completedStages.includes(stageCode)) {
      completedStages.push(stageCode);
    }

    const result = await this.prisma.protocolContext.update({
      where: { conversationId },
      data: {
        completedStages,
        currentStage: nextStage ?? context.currentStage,
        lastActiveAt: new Date(),
      },
    });

    return this.mapToContextData(result);
  }

  /**
   * 更新当前阶段
   */
  async updateCurrentStage(
    conversationId: string,
    stageCode: ProtocolStageCode
  ): Promise<ProtocolContextData> {
    const result = await this.prisma.protocolContext.update({
      where: { conversationId },
      data: {
        currentStage: stageCode,
        lastActiveAt: new Date(),
      },
    });

    return this.mapToContextData(result);
  }

  /**
   * 标记方案完成
   */
  async markCompleted(conversationId: string): Promise<ProtocolContextData> {
    const result = await this.prisma.protocolContext.update({
      where: { conversationId },
      data: {
        status: 'completed',
        lastActiveAt: new Date(),
      },
    });

    return this.mapToContextData(result);
  }

  /**
   * 检查是否所有阶段都已完成
   */
  isAllStagesCompleted(context: ProtocolContextData): boolean {
    const requiredStages: ProtocolStageCode[] = [
      'scientific_question',
      'pico',
      'study_design',
      'sample_size',
      'endpoints',
    ];

    return requiredStages.every(stage => context.completedStages.includes(stage));
  }

  /**
   * 检查是否可以生成研究方案（4/5 必填项）
   * 必填：科学问题、PICO、研究设计、观察指标
   * 可选：样本量
   */
  canGenerateProtocol(context: ProtocolContextData): boolean {
    const requiredStages: ProtocolStageCode[] = [
      'scientific_question',
      'pico',
      'study_design',
      'endpoints',
    ];

    return requiredStages.every(stage => context.completedStages.includes(stage));
  }

  /**
   * 获取缺失的必填阶段
   */
  getMissingRequiredStages(context: ProtocolContextData): ProtocolStageCode[] {
    const requiredStages: ProtocolStageCode[] = [
      'scientific_question',
      'pico',
      'study_design',
      'endpoints',
    ];

    return requiredStages.filter(stage => !context.completedStages.includes(stage));
  }

  /**
   * 获取进度百分比
   */
  getProgress(context: ProtocolContextData): number {
    const totalStages = 5;
    return Math.round((context.completedStages.length / totalStages) * 100);
  }

  /**
   * 获取阶段状态列表
   */
  getStagesStatus(context: ProtocolContextData): Array<{
    stageCode: ProtocolStageCode;
    stageName: string;
    status: 'completed' | 'current' | 'pending';
    data: Record<string, unknown> | null;
  }> {
    const stages: Array<{
      code: ProtocolStageCode;
      name: string;
      dataKey: keyof ProtocolContextData;
    }> = [
      { code: 'scientific_question', name: '科学问题梳理', dataKey: 'scientificQuestion' },
      { code: 'pico', name: 'PICO要素', dataKey: 'pico' },
      { code: 'study_design', name: '研究设计', dataKey: 'studyDesign' },
      { code: 'sample_size', name: '样本量计算', dataKey: 'sampleSize' },
      { code: 'endpoints', name: '观察指标', dataKey: 'endpoints' },
    ];

    return stages.map(stage => ({
      stageCode: stage.code,
      stageName: stage.name,
      status: context.completedStages.includes(stage.code)
        ? 'completed' as const
        : context.currentStage === stage.code
          ? 'current' as const
          : 'pending' as const,
      data: context[stage.dataKey] as unknown as Record<string, unknown> | null ?? null,
    }));
  }

  /**
   * 获取用于生成方案的完整数据
   */
  getGenerationData(context: ProtocolContextData): {
    scientificQuestion: ScientificQuestionData | null;
    pico: PICOData | null;
    studyDesign: StudyDesignData | null;
    sampleSize: SampleSizeData | null;
    endpoints: EndpointsData | null;
  } {
    return {
      scientificQuestion: context.scientificQuestion ?? null,
      pico: context.pico ?? null,
      studyDesign: context.studyDesign ?? null,
      sampleSize: context.sampleSize ?? null,
      endpoints: context.endpoints ?? null,
    };
  }

  /**
   * 将数据库结果映射为上下文数据
   */
  private mapToContextData(result: {
    id: string;
    conversationId: string;
    userId: string;
    currentStage: string;
    status: string;
    scientificQuestion: unknown;
    pico: unknown;
    studyDesign: unknown;
    sampleSize: unknown;
    endpoints: unknown;
    completedStages: string[];
    lastActiveAt: Date;
    createdAt: Date;
    updatedAt: Date;
  }): ProtocolContextData {
    return {
      id: result.id,
      conversationId: result.conversationId,
      userId: result.userId,
      currentStage: result.currentStage as ProtocolStageCode,
      status: result.status as ProtocolContextData['status'],
      scientificQuestion: result.scientificQuestion as ScientificQuestionData | undefined,
      pico: result.pico as PICOData | undefined,
      studyDesign: result.studyDesign as StudyDesignData | undefined,
      sampleSize: result.sampleSize as SampleSizeData | undefined,
      endpoints: result.endpoints as EndpointsData | undefined,
      completedStages: result.completedStages as ProtocolStageCode[],
      lastActiveAt: result.lastActiveAt,
      createdAt: result.createdAt,
      updatedAt: result.updatedAt,
    };
  }
}