/**
 * OmniCard AI (CRMmp) - 用户端一键保存至手机通讯录 (vCard 动态导出与原生导入)
 * 严格遵循 AGENTS.md 3.3、4.3、4.4 规范与 RFC 6350 / RFC 2426 国际通用标准
 * 一套代码兼顾 App 原生通讯录写入与 H5/Web 端 .vcf 文件动态导出
 */

import { CardProfile } from './types.uts';

/**
 * 智能拆分中英文姓名 (firstName 与 lastName)
 */
export function splitName(fullName: string): { firstName: string; lastName: string } {
  if (!fullName || !fullName.trim()) {
    return { firstName: '名片联系人', lastName: '' };
  }
  const trimmed = fullName.trim();

  // 1. 若包含空格，按空格分割 (英文名或带前缀的名)
  if (trimmed.includes(' ')) {
    const parts = trimmed.split(/\s+/);
    const lastName = parts.pop() || '';
    const firstName = parts.join(' ');
    return { firstName, lastName };
  }

  // 2. 中文常见复姓列表
  const doubleSurnames = [
    '欧阳', '太史', '端木', '上官', '司马', '东方', '独孤', '南宫',
    '万俟', '闻人', '夏侯', '诸葛', '尉迟', '公羊', '赫连', '澹台',
    '皇甫', '宗政', '濮阳', '淳于', '单于', '太叔', '申屠', '公孙',
    '仲孙', '轩辕', '令狐', '钟离', '宇文', '长孙', '慕容', '司徒', '司空'
  ];

  if (trimmed.length > 2) {
    const prefix2 = trimmed.slice(0, 2);
    if (doubleSurnames.indexOf(prefix2) !== -1) {
      return {
        lastName: prefix2,
        firstName: trimmed.slice(2),
      };
    }
  }

  // 3. 常见 2 字及以上单姓中文名
  if (trimmed.length >= 2) {
    return {
      lastName: trimmed.slice(0, 1),
      firstName: trimmed.slice(1),
    };
  }

  // 4. 单字名
  return {
    firstName: trimmed,
    lastName: '',
  };
}

/**
 * RFC 6350 字段值特殊字符转义
 */
export function escapeVCardText(text: string): string {
  if (!text) return '';
  return text
    .replace(/\\/g, '\\\\')
    .replace(/;/g, '\\;')
    .replace(/,/g, '\\,')
    .replace(/\r\n|\r|\n/g, '\\n');
}

/**
 * 严格执行 RFC 6350 第 3.2 节长行折叠 (Line Folding) 规范 (每行最大 75 字符)
 */
export function foldVCardLine(line: string, maxLen: number = 75): string {
  if (line.length <= maxLen) return line;

  let result = line.slice(0, maxLen);
  let remaining = line.slice(maxLen);

  while (remaining.length > 0) {
    result += '\r\n ' + remaining.slice(0, maxLen - 1);
    remaining = remaining.slice(maxLen - 1);
  }
  return result;
}

/**
 * 生成符合 RFC 6350 / RFC 2426 规范的 vCard 字符串 (默认 3.0，国际通用设备兼容性最高)
 */
export function buildVCardString(card: CardProfile, version: string = '3.0'): string {
  const lines: string[] = [];

  // 1. 开始标记与版本
  lines.push('BEGIN:VCARD');
  lines.push(`VERSION:${version}`);

  // 2. 姓名 (FN & N)
  const name = card.name ? card.name.trim() : '名片联系人';
  lines.push(`FN:${escapeVCardText(name)}`);

  const { firstName, lastName } = splitName(name);
  lines.push(`N:${escapeVCardText(lastName)};${escapeVCardText(firstName)};;;`);

  // 3. 组织与头衔
  if (card.company) {
    lines.push(`ORG:${escapeVCardText(card.company)}`);
  }
  if (card.title) {
    lines.push(`TITLE:${escapeVCardText(card.title)}`);
  }

  // 4. 电话与电子邮箱
  if (card.phone) {
    lines.push(`TEL;TYPE=CELL:${card.phone}`);
  }
  if (card.email) {
    lines.push(`EMAIL;TYPE=WORK:${card.email}`);
  }

  // 5. 微官网 URL 与 Slogan 备注
  if (card.url) {
    lines.push(`URL:${card.url}`);
  }
  if (card.slogan) {
    lines.push(`NOTE:${escapeVCardText(card.slogan)}`);
  }

  // 6. 社交主页链接 (WhatsApp / LinkedIn)
  if (card.whatsapp) {
    lines.push(`X-SOCIALPROFILE;TYPE=whatsapp:${card.whatsapp}`);
  }
  if (card.linkedin) {
    lines.push(`X-SOCIALPROFILE;TYPE=linkedin:${card.linkedin}`);
  }

  // 7. 头像照片 URL
  if (card.avatarUrl) {
    if (version === '3.0') {
      lines.push(`PHOTO;VALUE=URI:${card.avatarUrl}`);
    } else {
      lines.push(`PHOTO:${card.avatarUrl}`);
    }
  }

  // 8. 工作地址 (Street, Locality/City, Country)
  if (card.address || card.city || card.country) {
    const street = escapeVCardText(card.address || '');
    const city = escapeVCardText(card.city || '');
    const country = escapeVCardText(card.country || '');
    lines.push(`ADR;TYPE=WORK:;;${street};${city};;;${country}`);
  }

  // 9. 结束标记
  lines.push('END:VCARD');

  return lines.map((l) => foldVCardLine(l)).join('\r\n') + '\r\n';
}

/**
 * App 原生调用 uni.addPhoneContact 保存至系统通讯录
 */
function saveToAppContacts(card: CardProfile): Promise<boolean> {
  return new Promise<boolean>((resolve) => {
    const { firstName, lastName } = splitName(card.name);
    uni.addPhoneContact({
      firstName: firstName || '名片联系人',
      lastName: lastName || '',
      organization: card.company || '',
      title: card.title || '',
      mobilePhoneNumber: card.phone || '',
      email: card.email || '',
      remark: card.slogan || '',
      url: card.url || '',
      workAddressStreet: card.address || '',
      workAddressCity: card.city || '',
      workAddressCountry: card.country || '',
      success: () => {
        uni.showToast({
          title: '已存入通讯录',
          icon: 'success',
        });
        resolve(true);
      },
      fail: (err: any) => {
        console.warn('saveToContacts fail:', err);
        uni.showToast({
          title: '未存入通讯录',
          icon: 'none',
        });
        resolve(false);
      },
    });
  });
}

/**
 * H5 / Web 端生成 .vcf Blob 并触发自动下载或拉起系统通讯录
 */
function exportH5VCard(card: CardProfile): Promise<boolean> {
  return new Promise<boolean>((resolve) => {
    try {
      const vcfContent = buildVCardString(card, '3.0');
      const blob = new Blob([vcfContent], { type: 'text/vcard;charset=utf-8;' });
      const fileName = `${card.name ? card.name.trim() : 'contact'}.vcf`;

      if (typeof window !== 'undefined' && window.document) {
        const url = window.URL.createObjectURL(blob);
        const link = window.document.createElement('a');
        link.href = url;
        link.setAttribute('download', fileName);
        link.style.display = 'none';
        window.document.body.appendChild(link);
        link.click();

        setTimeout(() => {
          try {
            window.document.body.removeChild(link);
            window.URL.revokeObjectURL(url);
          } catch (e) {}
        }, 200);

        if (typeof uni !== 'undefined' && typeof uni.showToast === 'function') {
          uni.showToast({
            title: '已存入通讯录',
            icon: 'success',
          });
        }
        resolve(true);
      } else {
        resolve(false);
      }
    } catch (err) {
      console.error('exportH5VCard error:', err);
      if (typeof uni !== 'undefined' && typeof uni.showToast === 'function') {
        uni.showToast({
          title: '名片导出失败',
          icon: 'none',
        });
      }
      resolve(false);
    }
  });
}

/**
 * 一键保存名片至手机通讯录 (核心统一对外 API)
 *
 * @param card 名片基础资料契约
 * @returns 是否成功存入/唤起下载
 */
export function saveToContacts(card: CardProfile): Promise<boolean> {
  // #ifdef APP
  if (typeof uni !== 'undefined' && typeof (uni as any).addPhoneContact === 'function') {
    return saveToAppContacts(card);
  }
  // #endif

  // #ifdef H5
  return exportH5VCard(card);
  // #endif

  // 跨平台降级与非 HBuilderX 预编译测试环境嗅探
  if (typeof uni !== 'undefined' && typeof (uni as any).addPhoneContact === 'function') {
    return saveToAppContacts(card);
  }
  return exportH5VCard(card);
}