import { Injectable, Logger } from '@nestjs/common';
import { PrismaService } from '../../common/prisma/prisma.module';
import { LlmChatClient } from '../llm/llm-chat.client';
import { KnowledgeRetrievalService } from '../llm/knowledge-retrieval.service';
import { WecomBotActionsService } from './wecom-bot-actions.service';
import { parseWecomToolLine, sanitizeWecomUserReply } from './wecom-bot-reply.util';
import type { WecomBotRuntimeConfig } from './wecom-bot.types';
import { wecomBotHasPermission } from './wecom-bot.types';

const DEFAULT_SYSTEM = [
  '你是杜康好客企业内部助手。',
  '优先依据提供的知识库内容回答；知识库未覆盖时如实说明不确定。',
  '不要编造订单号、金额、权限；涉及写操作请引导用户使用指令（如「帮助」）。',
  '回答简洁，使用中文。',
].join('');

const TOOL_INSTRUCTION = [
  '当用户需要查询业务数据时，你必须在回复的第一行输出工具指令（仅一行，用户不可见后续会过滤）：',
  '格式：`TOOL <工具名> [参数]`',
  '可用工具（按权限）：',
  '- order_read <订单号>',
  '- delivery_read <单号>',
  '- store_read <关键词> · redeem_read <核销单号或门店>',
  '- user_read <用户号>',
  '- support_tickets_open · support_ticket_read [工单号]',
  '- support_ticket_approve <工单号> · support_ticket_reject <工单号> <理由>',
  '- finance_store_bill [门店] · finance_partner_bill · finance_winery_bill · finance_logistics_bill',
  '- finance_payout · finance_withdrawal',
  '- dev_plan_tasks [状态] · dev_plan_versions [版本号]',
  '- dev_plan_task_create <BUG|REQUIREMENT|OPTIMIZATION> <描述>',
  '- dev_plan_task_update_status <任务编号> <TODO|IN_PROGRESS|DEVELOPED|RELEASED>',
  '- dev_plan_version_create <版本号>',
  '- dev_plan_version_update_status <版本号> <PENDING|IN_PROGRESS|TESTING|RELEASED>',
  '- dev_plan_version_link_tasks <版本号> <任务编号1,任务编号2>',
  '- server_logs [关键词] · handbook_read [关键词]',
  '禁止输出 JSON、api 字段、「请稍等正在检索」等占位话术。',
  '若仅需解释概念、无需查库，第一行写 `ANSWER` 后直接回答。',
].join('\n');

@Injectable()
export class WecomBotAiService {
  private readonly logger = new Logger(WecomBotAiService.name);

  constructor(
    private readonly prisma: PrismaService,
    private readonly llm: LlmChatClient,
    private readonly kb: KnowledgeRetrievalService,
    private readonly actions: WecomBotActionsService,
  ) {}

  async replyIfConfigured(
    bot: WecomBotRuntimeConfig,
    userText: string,
    wecomUserId: string,
  ): Promise<string | null> {
    if (!bot.aiEnabled || !bot.llmConfigId) return null;

    const cfg = await this.prisma.llmApiConfig.findUnique({
      where: { id: BigInt(bot.llmConfigId) },
    });
    if (!cfg?.enabled) {
      return '已开启 AI，但绑定的语言模型未启用或已删除。请在 HQ「企微机器人」检查配置。';
    }

    let kbBlock = '';
    if (bot.knowledgeBaseId) {
      try {
        kbBlock = await this.kb.buildContext(BigInt(bot.knowledgeBaseId), userText);
      } catch (e) {
        this.logger.warn(`kb retrieve failed: ${String(e)}`);
      }
    }

    const systemParts = [
      cfg.systemPrompt?.trim() || DEFAULT_SYSTEM,
      this.buildToolHint(bot),
      TOOL_INSTRUCTION,
      kbBlock ? `\n\n以下为知识库检索片段：\n${kbBlock}` : '',
    ];

    try {
      this.logger.log(
        `wecom ai request bot=${bot.key} user=${wecomUserId} text=${userText.slice(0, 80)}`,
      );
      const raw = await this.llm.chat({
        baseUrl: cfg.baseUrl,
        apiKey: cfg.apiKey,
        model: cfg.modelName,
        temperature: cfg.temperature != null ? Number(cfg.temperature) : 0.3,
        maxTokens: cfg.maxTokens ?? 1024,
        messages: [
          { role: 'system', content: systemParts.join('') },
          { role: 'user', content: userText },
        ],
      });

      const tool = parseWecomToolLine(raw);
      if (tool) {
        this.logger.log(
          `wecom ai tool=${tool.name} bot=${bot.key} user=${wecomUserId} args=${tool.args.slice(0, 80)}`,
        );
        try {
          const result = await this.actions.runTool(bot, wecomUserId, tool.name, tool.args);
          return result;
        } catch (e) {
          const msg = e instanceof Error ? e.message : String(e);
          this.logger.warn(`wecom ai tool failed ${tool.name}: ${msg}`);
          return `查询失败：${msg}`;
        }
      }

      const answerMatch = raw.match(/^ANSWER\s+([\s\S]*)/i);
      if (answerMatch) {
        return sanitizeWecomUserReply(answerMatch[1]);
      }

      return sanitizeWecomUserReply(raw);
    } catch (e) {
      const msg = e instanceof Error ? e.message : String(e);
      this.logger.error(`wecom ai reply failed: ${msg}`);
      return `AI 回复失败：${msg}`;
    }
  }

  private buildToolHint(bot: WecomBotRuntimeConfig): string {
    const tools: string[] = [];
    if (wecomBotHasPermission(bot, 'order.read')) tools.push('order_read');
    if (wecomBotHasPermission(bot, 'delivery.read')) tools.push('delivery_read');
    if (wecomBotHasPermission(bot, 'store.read')) tools.push('store_read');
    if (wecomBotHasPermission(bot, 'redeem.read')) tools.push('redeem_read');
    if (wecomBotHasPermission(bot, 'user.read')) tools.push('user_read');
    if (wecomBotHasPermission(bot, 'support_ticket.read')) {
      tools.push('support_tickets_open', 'support_ticket_read');
    }
    if (wecomBotHasPermission(bot, 'finance.store_bill.read')) tools.push('finance_store_bill');
    if (wecomBotHasPermission(bot, 'finance.partner_bill.read')) tools.push('finance_partner_bill');
    if (wecomBotHasPermission(bot, 'finance.winery_bill.read')) tools.push('finance_winery_bill');
    if (wecomBotHasPermission(bot, 'finance.logistics_bill.read')) tools.push('finance_logistics_bill');
    if (wecomBotHasPermission(bot, 'finance.payout.read')) tools.push('finance_payout');
    if (wecomBotHasPermission(bot, 'finance.withdrawal.read')) tools.push('finance_withdrawal');
    if (wecomBotHasPermission(bot, 'dev_plan.task.read')) tools.push('dev_plan_tasks');
    if (wecomBotHasPermission(bot, 'dev_plan.version.read')) tools.push('dev_plan_versions');
    if (wecomBotHasPermission(bot, 'dev_plan.version.link_tasks')) tools.push('dev_plan_version_link_tasks');
    if (wecomBotHasPermission(bot, 'server_log.read')) tools.push('server_logs');
    if (wecomBotHasPermission(bot, 'handbook.read')) tools.push('handbook_read');
    if (!tools.length) return '';
    return `\n\n当前机器人可用工具：${tools.join(', ')}`;
  }
}