import * as crypto from 'crypto';
import axios from 'axios';
import { Provide } from '@midwayjs/core';
import { BaseService, CoolCommException } from '@cool-midway/core';
import { CrmLeadEntity } from '../entity/lead';

/**
 * HubSpot Contacts v3 API 格式
 */
export interface HubSpotContactPayload {
  properties: {
    email: string;
    firstname: string;
    lastname: string;
    phone: string;
    company: string;
    lifecyclestage: 'lead';
  };
}

import { SalesforceLeadPayload } from './salesforce';

/**
 * Webhook 发送配置选项
 */
export interface WebhookSendOptions {
  maxRetries?: number;
  delayMs?: number;
  timeoutMs?: number;
}

/**
 * Webhook 发送响应结果
 */
export interface WebhookResult {
  success: boolean;
  attempts: number;
  data?: unknown;
  error?: string;
}

/**
 * Slack Incoming Webhook 消息体（组包格式）
 */
export interface SlackMessagePayload {
  text: string;
  blocks?: Array<{
    type: string;
    text?: { type: string; text: string };
  }>;
}

/**
 * 飞书自定义机器人消息体（组包格式）
 */
export interface FeishuMessagePayload {
  msg_type: 'text';
  content: { text: string };
}

/**
 * Slack / 飞书外发结果：仅 HTTP 明确成功才 delivered:true
 */
export interface ChannelNotifyResult {
  delivered: boolean;
  channel: 'slack' | 'feishu';
  payload: SlackMessagePayload | FeishuMessagePayload;
  reason?: string;
  error?: string;
  attempts?: number;
}

/**
 * 国际主流 CRM (HubSpot / Salesforce / Webhook) 对接服务
 */
@Provide()
export class CrmSyncService extends BaseService {
  /**
   * 智能拆分姓名
   */
  private splitName(name?: string): { firstName: string; lastName: string } {
    const parts = (name || '').trim().split(/\s+/).filter(Boolean);
    if (parts.length === 0) {
      return { firstName: '', lastName: '' };
    }
    if (parts.length === 1) {
      return { firstName: parts[0], lastName: '' };
    }
    return {
      firstName: parts[0],
      lastName: parts.slice(1).join(' '),
    };
  }

  /**
   * 异步延时工具
   */
  private sleep(ms: number): Promise<void> {
    return new Promise(resolve => setTimeout(resolve, ms));
  }

  /**
   * 转换成 HubSpot Contacts v3 API 格式
   */
  formatToHubSpot(lead: Partial<CrmLeadEntity>): HubSpotContactPayload {
    const { firstName, lastName } = this.splitName(lead?.name);
    return {
      properties: {
        email: lead?.email || '',
        firstname: firstName,
        lastname: lastName,
        phone: lead?.phone || '',
        company: lead?.company || '',
        lifecyclestage: 'lead',
      },
    };
  }

  /**
   * 转换成 Salesforce Lead sObject 格式
   */
  formatToSalesforce(lead: Partial<CrmLeadEntity>): SalesforceLeadPayload {
    const { firstName, lastName } = this.splitName(lead?.name);
    let finalFirstName = firstName;
    let finalLastName = lastName;

    // Salesforce 规范：LastName 必填；若仅单名，LastName 取该名，FirstName 为空；若全无，LastName 为 'Unknown'
    if (!lastName) {
      finalFirstName = '';
      finalLastName = firstName || 'Unknown';
    }

    return {
      FirstName: finalFirstName,
      LastName: finalLastName,
      Email: lead?.email || '',
      Company: lead?.company || 'Unknown',
      Phone: lead?.phone || '',
      Status: 'Open - Not Contacted',
    };
  }

  /**
   * 组装 Slack Incoming Webhook 消息（仅组包，不代表已送达）
   */
  formatToSlack(lead: Partial<CrmLeadEntity>): SlackMessagePayload {
    const name = (lead?.name || '').trim() || 'Unknown';
    const company = (lead?.company || '').trim() || '-';
    const email = (lead?.email || '').trim() || '-';
    const phone = (lead?.phone || '').trim() || '-';
    const text = `OmniCard Lead: ${name} @ ${company} | ${email} | ${phone}`;
    return {
      text,
      blocks: [
        {
          type: 'section',
          text: { type: 'mrkdwn', text: `*${name}* · ${company}\n${email} · ${phone}` },
        },
      ],
    };
  }

  /**
   * 组装飞书自定义机器人文本消息（仅组包，不代表已送达）
   */
  formatToFeishu(lead: Partial<CrmLeadEntity>): FeishuMessagePayload {
    const name = (lead?.name || '').trim() || 'Unknown';
    const company = (lead?.company || '').trim() || '-';
    const email = (lead?.email || '').trim() || '-';
    const phone = (lead?.phone || '').trim() || '-';
    return {
      msg_type: 'text',
      content: {
        text: `OmniCard 线索：${name} @ ${company} | ${email} | ${phone}`,
      },
    };
  }

  /**
   * 发送 Slack：无 URL 只组包且 delivered:false；仅公网 HTTP 成功才 delivered:true
   */
  async sendSlack(
    webhookUrl: string | undefined,
    lead: Partial<CrmLeadEntity>,
    options?: WebhookSendOptions
  ): Promise<ChannelNotifyResult> {
    const payload = this.formatToSlack(lead);
    const url = (webhookUrl || '').trim();
    if (!url) {
      return {
        delivered: false,
        channel: 'slack',
        payload,
        reason: '未配置 Slack Webhook',
      };
    }
    if (this.isDisallowedWebhookUrl(url)) {
      throw new CoolCommException('拒绝内网或非 http(s) Webhook URL', 400);
    }

    const maxRetries = options?.maxRetries ?? 3;
    const baseDelay = options?.delayMs ?? 100;
    const timeout = options?.timeoutMs ?? 5000;
    let lastError: Error | null = null;

    for (let attempt = 1; attempt <= maxRetries; attempt++) {
      try {
        await axios.post(url, payload, {
          headers: { 'Content-Type': 'application/json' },
          timeout,
          validateStatus: status => status >= 200 && status < 300,
        });
        return {
          delivered: true,
          channel: 'slack',
          payload,
          attempts: attempt,
        };
      } catch (err: unknown) {
        lastError = err instanceof Error ? err : new Error(String(err));
        if (attempt < maxRetries) {
          await this.sleep(baseDelay * Math.pow(2, attempt - 1));
        }
      }
    }

    return {
      delivered: false,
      channel: 'slack',
      payload,
      attempts: maxRetries,
      error: lastError?.message || 'Slack request failed',
    };
  }

  /**
   * 发送飞书：无 URL 只组包且 delivered:false；仅公网 HTTP 成功才 delivered:true
   */
  async sendFeishu(
    webhookUrl: string | undefined,
    lead: Partial<CrmLeadEntity>,
    options?: WebhookSendOptions
  ): Promise<ChannelNotifyResult> {
    const payload = this.formatToFeishu(lead);
    const url = (webhookUrl || '').trim();
    if (!url) {
      return {
        delivered: false,
        channel: 'feishu',
        payload,
        reason: '未配置飞书 Webhook',
      };
    }
    if (this.isDisallowedWebhookUrl(url)) {
      throw new CoolCommException('拒绝内网或非 http(s) Webhook URL', 400);
    }

    const maxRetries = options?.maxRetries ?? 3;
    const baseDelay = options?.delayMs ?? 100;
    const timeout = options?.timeoutMs ?? 5000;
    let lastError: Error | null = null;

    for (let attempt = 1; attempt <= maxRetries; attempt++) {
      try {
        await axios.post(url, payload, {
          headers: { 'Content-Type': 'application/json' },
          timeout,
          validateStatus: status => status >= 200 && status < 300,
        });
        return {
          delivered: true,
          channel: 'feishu',
          payload,
          attempts: attempt,
        };
      } catch (err: unknown) {
        lastError = err instanceof Error ? err : new Error(String(err));
        if (attempt < maxRetries) {
          await this.sleep(baseDelay * Math.pow(2, attempt - 1));
        }
      }
    }

    return {
      delivered: false,
      channel: 'feishu',
      payload,
      attempts: maxRetries,
      error: lastError?.message || 'Feishu request failed',
    };
  }

  /**
   * 计算 HMAC-SHA256 签名
   */
  generateSignature(payload: unknown, secret: string): string {
    const content =
      typeof payload === 'string' ? payload : JSON.stringify(payload);
    return crypto.createHmac('sha256', secret).update(content).digest('hex');
  }

  /**
   * 拒绝内网 / 环回 / 非 http(s) Webhook URL（与雷达推送同等规则）
   */
  private isDisallowedWebhookUrl(urlStr: string): boolean {
    let parsed: URL;
    try {
      parsed = new URL(urlStr);
    } catch {
      return true;
    }
    if (parsed.protocol !== 'http:' && parsed.protocol !== 'https:') {
      return true;
    }
    const host = parsed.hostname.toLowerCase();
    if (host === 'localhost' || host === '127.0.0.1') {
      return true;
    }
    if (/^10\.\d{1,3}\.\d{1,3}\.\d{1,3}$/.test(host)) {
      return true;
    }
    const m172 = /^172\.(\d{1,3})\.\d{1,3}\.\d{1,3}$/.exec(host);
    if (m172) {
      const second = Number(m172[1]);
      if (second >= 16 && second <= 31) {
        return true;
      }
    }
    if (/^192\.168\.\d{1,3}\.\d{1,3}$/.test(host)) {
      return true;
    }
    return false;
  }

  /**
   * 发送带 HMAC-SHA256 签名的 Webhook，具备模拟退避重试（最多 3 次）
   */
  async sendWebhook(
    url: string,
    secret: string,
    lead: Partial<CrmLeadEntity>,
    options?: WebhookSendOptions
  ): Promise<WebhookResult> {
    if (!url || !url.trim()) {
      throw new CoolCommException('缺少目标 Webhook URL', 400);
    }
    if (this.isDisallowedWebhookUrl(url.trim())) {
      throw new CoolCommException('拒绝内网或非 http(s) Webhook URL', 400);
    }

    const payload = {
      event: 'crm.lead.sync',
      timestamp: Date.now(),
      data: lead,
    };

    const signature = this.generateSignature(payload, secret || '');
    const headers = {
      'Content-Type': 'application/json',
      'X-OmniCard-Signature': signature,
    };

    const maxRetries = options?.maxRetries ?? 3;
    const baseDelay = options?.delayMs ?? 100;
    const timeout = options?.timeoutMs ?? 5000;

    let lastError: Error | null = null;

    for (let attempt = 1; attempt <= maxRetries; attempt++) {
      try {
        const response = await axios.post(url, payload, { headers, timeout });
        return {
          success: true,
          attempts: attempt,
          data: response.data,
        };
      } catch (err: unknown) {
        lastError = err instanceof Error ? err : new Error(String(err));
        if (attempt < maxRetries) {
          const delay = baseDelay * Math.pow(2, attempt - 1);
          await this.sleep(delay);
        }
      }
    }

    return {
      success: false,
      attempts: maxRetries,
      error: lastError?.message || 'Webhook request failed',
    };
  }
}