/**
 * OmniCard AI (CRMmp) - 移动端拍照上传纸质名片 OCR 识别入库业务驱动层 (Point 25)
 * 严格遵循 uts 强类型规范、零 emoji 与 AGENTS.md 约束
 */

import { ExchangeForm } from './useExchange.uts';

export type ExtractedContactInfo = {
  name: string;
  company: string;
  phone: string;
  email: string;
  title: string;
  notes: string;
  rawText: string;
};

export type OcrScanState = {
  scanning: boolean;
  rawText: string;
  imagePath: string;
  lastExtracted: ExtractedContactInfo | null;
  errorMessage: string;
};

export type HandleOcrUploadOptions = {
  mockText?: string;
  sourceType?: string[];
  overwrite?: boolean;
};

/**
 * 规范化国际 E.164 电话号码
 * 例如：
 * - "+86 138 0013 8000" -> "+8613800138000"
 * - "+1 (555) 234-5678" -> "+15552345678"
 * - "0086 13800138000" -> "+8613800138000"
 * - "13912345678" -> "+8613912345678"
 */
export function normalizeE164Phone(rawPhone: string): string {
  const trimmed = rawPhone.trim();
  if (trimmed === '') {
    return '';
  }

  // 替换开头的 00 国际前缀为 +
  let cleaned = trimmed.replace(/^00/, '+');

  // 若开头有 +
  if (cleaned.startsWith('+')) {
    const digitsOnly = cleaned.substring(1).replace(/[\s\-\(\)\.]/g, '');
    if (/^\d{7,15}$/.test(digitsOnly)) {
      return '+' + digitsOnly;
    }
  }

  // 移除非数字符号
  const digitsOnly = cleaned.replace(/[\s\-\(\)\.]/g, '');

  // 中国国内 11 位手机号码自动补充 +86
  if (/^1[3-9]\d{9}$/.test(digitsOnly)) {
    return '+86' + digitsOnly;
  }

  // 已经带有国家代码的无+纯数字
  if (/^\d{10,15}$/.test(digitsOnly)) {
    return '+' + digitsOnly;
  }

  return cleaned;
}

/**
 * 创建 OCR 扫描处理状态
 */
export function createOcrScanState(): OcrScanState {
  return {
    scanning: false,
    rawText: '',
    imagePath: '',
    lastExtracted: null,
    errorMessage: '',
  };
}

/**
 * 预览已拍照的名片图片
 */
export function previewOcrImage(ocrState: OcrScanState): void {
  if (ocrState.imagePath !== '') {
    // #ifndef UNI-APP-X-TEST
    try {
      if (typeof uni !== 'undefined' && typeof uni.previewImage === 'function') {
        uni.previewImage({
          urls: [ocrState.imagePath],
          current: ocrState.imagePath,
        });
      }
    } catch (_e) {}
    // #endif
  }
}

/**
 * 删除已拍摄的名片图片
 */
export function removeOcrImage(ocrState: OcrScanState): void {
  ocrState.imagePath = '';
}

/**
 * 判断是否为职位关键词
 */
function isTitleCandidate(text: string): boolean {
  const lower = text.toLowerCase();
  const englishTitles = [
    'ceo',
    'cto',
    'coo',
    'cfo',
    'cio',
    'cmo',
    'vp',
    'vice president',
    'director',
    'manager',
    'engineer',
    'architect',
    'founder',
    'co-founder',
    'president',
    'partner',
    'consultant',
    'lead',
    'officer',
    'specialist',
  ];

  for (let i = 0; i < englishTitles.length; i++) {
    const title = englishTitles[i];
    if (lower === title || lower.startsWith(title + ' ') || lower.endsWith(' ' + title)) {
      return true;
    }
    if (new RegExp('\\b' + title + '\\b', 'i').test(text)) {
      return true;
    }
  }

  const chineseTitles = [
    '总裁',
    '总经理',
    '总监',
    '经理',
    '主管',
    '创始人',
    '联合创始人',
    '合伙人',
    '工程师',
    '架构师',
    '顾问',
    '助理',
    '教授',
    '博士',
    '设计师',
  ];

  for (let i = 0; i < chineseTitles.length; i++) {
    if (text.includes(chineseTitles[i])) {
      return true;
    }
  }

  return false;
}

/**
 * 判断是否为公司/组织关键词
 */
function isCompanyCandidate(text: string): boolean {
  const englishCompanyKeywords = [
    'inc',
    'ltd',
    'llc',
    'corp',
    'corporation',
    'co',
    'company',
    'group',
    'holdings',
    'enterprises',
    'solutions',
    'technologies',
    'systems',
    'gmbh',
    'pte',
  ];

  for (let i = 0; i < englishCompanyKeywords.length; i++) {
    const kw = englishCompanyKeywords[i];
    if (new RegExp('\\b' + kw + '\\b', 'i').test(text)) {
      return true;
    }
  }

  const chineseCompanyKeywords = [
    '公司',
    '集团',
    '有限',
    '股份',
    '科技',
    '网络',
    '事务所',
    '工作室',
    '企业',
    '中心',
  ];

  for (let i = 0; i < chineseCompanyKeywords.length; i++) {
    if (text.includes(chineseCompanyKeywords[i])) {
      return true;
    }
  }

  return false;
}

/**
 * 判断是否属于地址、网址或标语等干扰噪音
 */
function isNoiseLine(text: string): boolean {
  // 网址
  if (/^https?:\/\//i.test(text) || /^www\./i.test(text) || /\.(com|org|net|io|cn|ai|cc|me)(\/|$)/i.test(text)) {
    return true;
  }
  // 地址
  if (/(?:地址|address|addr)[\s:：]/i.test(text)) {
    return true;
  }
  if (/(?:大厦|科技园|街|路|区|市|省|层|楼|室|road|street|avenue|blvd|floor|suite|building)/i.test(text)) {
    return true;
  }
  // 纯标语 (长文本)
  if (text.length > 25 && /(?:致力于|打造|引领|专注|赋能|empower|leading|innovative)/i.test(text)) {
    return true;
  }
  // 纯特殊符号乱码
  if (/^[#!\@\$\%\^\&\*\(\)\_\+\-\=\[\]\{\}\\\|\;\:\'\"\,\<\.\>\/\?\s~`0-9]+$/.test(text) && !/\d{7,}/.test(text)) {
    return true;
  }
  return false;
}

/**
 * 核心算法：解析纸质名片 OCR 原始文本，提取结构化名片联系信息
 */
export function parseOcrCardText(rawOcrText: string): ExtractedContactInfo {
  const result: ExtractedContactInfo = {
    name: '',
    company: '',
    phone: '',
    email: '',
    title: '',
    notes: '',
    rawText: rawOcrText,
  };

  if (!rawOcrText || rawOcrText.trim() === '') {
    return result;
  }

  const rawLines = rawOcrText
    .replace(/\r\n/g, '\n')
    .replace(/\r/g, '\n')
    .split('\n');

  const lines: string[] = [];
  for (let i = 0; i < rawLines.length; i++) {
    const l = rawLines[i].trim();
    if (l !== '') {
      lines.push(l);
    }
  }

  if (lines.length === 0) {
    return result;
  }

  // 1. 优先提取 Email
  const emailRegex = /[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}/i;
  for (let i = 0; i < lines.length; i++) {
    const line = lines[i];
    const match = line.match(emailRegex);
    if (match != null && match.length > 0) {
      result.email = match[0].trim();
      break;
    }
  }

  // 2. 提取电话号码 (支持国际 E.164 与国内常见格式)
  for (let i = 0; i < lines.length; i++) {
    const line = lines[i];
    // 忽略已经是纯邮箱的行
    if (result.email !== '' && line.includes(result.email) && !/(?:tel|phone|mobile|cell|whatsapp|电话|手机)/i.test(line)) {
      continue;
    }

    // 检查带前缀的号码
    const prefixedMatch = line.match(/(?:tel|phone|mobile|cell|whatsapp|fax|电话|手机|座机|联系方式)[\s:：]*([+0-9\s\-\(\)\.]{6,25})/i);
    if (prefixedMatch != null && prefixedMatch[1]) {
      const extractedPhone = normalizeE164Phone(prefixedMatch[1]);
      if (extractedPhone !== '') {
        result.phone = extractedPhone;
        break;
      }
    }

    // 检查国际 + 号号码
    const intlMatch = line.match(/(\+[1-9]\d{0,3}[\s\-\(\)]*(?:\d[\s\-\(\)]*){6,14}\d)/);
    if (intlMatch != null && intlMatch[1]) {
      const extractedPhone = normalizeE164Phone(intlMatch[1]);
      if (extractedPhone !== '') {
        result.phone = extractedPhone;
        break;
      }
    }

    // 检查中国国内 11 位手机号码
    const cnMobileMatch = line.match(/(?:^|[^\d])(1[3-9]\d{9})(?:[^\d]|$)/);
    if (cnMobileMatch != null && cnMobileMatch[1]) {
      result.phone = normalizeE164Phone(cnMobileMatch[1]);
      break;
    }
  }

  // 3. 提取带有明确标签的字段
  for (let i = 0; i < lines.length; i++) {
    const line = lines[i];

    // 姓名标签
    const nameMatch = line.match(/^(?:姓名|联系人|Name|Contact(?:\s+person)?)[\s:：]+(.+)$/i);
    if (nameMatch != null && nameMatch[1] && result.name === '') {
      result.name = nameMatch[1].trim();
      continue;
    }

    // 职务标签
    const titleMatch = line.match(/^(?:职务|职位|头衔|Title|Position|Role)[\s:：]+(.+)$/i);
    if (titleMatch != null && titleMatch[1] && result.title === '') {
      result.title = titleMatch[1].trim();
      continue;
    }

    // 公司标签
    const compMatch = line.match(/^(?:公司|企业|单位|组织|Company|Organization|Org|Enterprise|Firm)[\s:：]+(.+)$/i);
    if (compMatch != null && compMatch[1] && result.company === '') {
      result.company = compMatch[1].trim();
      continue;
    }

    // 备注标签
    const noteMatch = line.match(/^(?:备注|留言|Note|Notes)[\s:：]+(.+)$/i);
    if (noteMatch != null && noteMatch[1] && result.notes === '') {
      result.notes = noteMatch[1].trim();
      continue;
    }
  }

  // 4. 识别同行包含姓名和职务的模式，例如："李小峰 / 首席架构师", "Alex Morgan | CTO"
  if (result.name === '' || result.title === '') {
    for (let i = 0; i < lines.length; i++) {
      const line = lines[i];
      if (line.includes(result.email) || (result.phone !== '' && line.includes(result.phone))) {
        continue;
      }
      const splitMatch = line.match(/^([^\/|(\-]+)\s*[\/|(\-]\s*([^\/|)\-]+)$/);
      if (splitMatch != null && splitMatch[1] && splitMatch[2]) {
        const part1 = splitMatch[1].trim();
        const part2 = splitMatch[2].trim();
        if (isTitleCandidate(part2) && !isCompanyCandidate(part1)) {
          if (result.name === '') {
            result.name = part1;
          }
          if (result.title === '') {
            result.title = part2;
          }
          break;
        } else if (isTitleCandidate(part1) && !isCompanyCandidate(part2)) {
          if (result.title === '') {
            result.title = part1;
          }
          if (result.name === '') {
            result.name = part2;
          }
          break;
        }
      }
    }
  }

  // 5. 提取公司名称 (若尚未识别)
  if (result.company === '') {
    for (let i = 0; i < lines.length; i++) {
      const line = lines[i];
      if (line.includes(result.email) || (result.phone !== '' && line.includes(result.phone))) {
        continue;
      }
      if (isNoiseLine(line)) {
        continue;
      }
      if (isCompanyCandidate(line)) {
        result.company = line;
        break;
      }
    }
  }

  // 6. 提取职务 (若尚未识别)
  if (result.title === '') {
    for (let i = 0; i < lines.length; i++) {
      const line = lines[i];
      if (line === result.company || line.includes(result.email) || (result.phone !== '' && line.includes(result.phone))) {
        continue;
      }
      if (isNoiseLine(line)) {
        continue;
      }
      if (isTitleCandidate(line)) {
        result.title = line;
        break;
      }
    }
  }

  // 7. 提取人名 (若尚未识别)
  if (result.name === '') {
    for (let i = 0; i < lines.length; i++) {
      const line = lines[i];
      if (
        line === result.company ||
        line === result.title ||
        line.includes(result.email) ||
        (result.phone !== '' && line.includes(result.phone))
      ) {
        continue;
      }
      if (isNoiseLine(line) || isCompanyCandidate(line) || isTitleCandidate(line)) {
        continue;
      }

      // 中文姓名 (2-4 个汉字)
      if (/^[\u4e00-\u9fa5]{2,4}$/.test(line)) {
        result.name = line;
        break;
      }

      // 英文姓名 (2-3 个首字母大写词)
      if (/^[A-Z][a-zA-Z]*(?:\s+[A-Z]\.?)?\s+[A-Z][a-zA-Z]+$/.test(line)) {
        result.name = line;
        break;
      }
    }
  }

  return result;
}

/**
 * 智能填单与缺失字段保护
 * - 只有 extractedInfo 中非空且有效字段才会覆盖/填充
 * - extractedInfo 中缺失的字段不会清空表单中已有的数据
 * - 若 overwrite 为 false（默认 true），则仅在表单字段为空时填入
 */
export function fillFormFromOcr(
  form: ExchangeForm,
  extracted: ExtractedContactInfo,
  overwrite: boolean = true
): ExchangeForm {
  if (!form || !extracted) {
    return form;
  }

  // 姓名填充与保护
  const extractedName = extracted.name ? extracted.name.trim() : '';
  if (extractedName !== '') {
    if (overwrite || !form.name || form.name.trim() === '') {
      form.name = extractedName;
    }
  }

  // 公司填充与保护
  const extractedCompany = extracted.company ? extracted.company.trim() : '';
  if (extractedCompany !== '') {
    if (overwrite || !form.company || form.company.trim() === '') {
      form.company = extractedCompany;
    }
  }

  // 电话填充与保护
  const extractedPhone = extracted.phone ? extracted.phone.trim() : '';
  if (extractedPhone !== '') {
    if (overwrite || !form.phone || form.phone.trim() === '') {
      form.phone = extractedPhone;
    }
  }

  // 邮箱填充与保护
  const extractedEmail = extracted.email ? extracted.email.trim() : '';
  if (extractedEmail !== '') {
    if (overwrite || !form.email || form.email.trim() === '') {
      form.email = extractedEmail;
    }
  }

  // 备注或职务填充与保护
  const noteContent = extracted.notes && extracted.notes.trim() !== ''
    ? extracted.notes.trim()
    : (extracted.title ? extracted.title.trim() : '');

  if (noteContent !== '') {
    if (overwrite || !form.notes || form.notes.trim() === '') {
      form.notes = noteContent;
    }
  }

  return form;
}

/**
 * 模拟 OCR 识别返回预设样例名片，用于客户端无外部云 OCR 时的交互演示与离线测试
 */
export function simulateOcrScan(sampleType?: string): ExtractedContactInfo {
  if (sampleType === 'uae' || sampleType === 'dubai') {
    return parseOcrCardText(`
      Tariq Mansour
      Dubai Trade Center LLC
      Chief Executive Officer
      WhatsApp: +971 50 123 4567
      Email: tariq@dubaitrade.ae
    `);
  }

  if (sampleType === 'global' || sampleType === 'en') {
    return parseOcrCardText(`
      OmniCard AI Global Inc.
      Alex Morgan
      Chief Technology Officer
      alex.morgan@omnicard.ai
      +1 555-234-5678
    `);
  }

  return parseOcrCardText(`
    姓名: 张伟
    职务: 研发总监
    公司: 深圳超维智能科技有限公司
    电话: +86 138-0013-8000
    邮箱: zhangwei@chaowei-ai.com
  `);
}

/**
 * 拍照或上传名片 OCR 识别流程处理入口
 */
export async function handleCardOcrUpload(
  form: ExchangeForm,
  ocrState: OcrScanState,
  options?: HandleOcrUploadOptions
): Promise<boolean> {
  const opt = options != null ? options : {};
  const overwrite = opt.overwrite !== undefined ? opt.overwrite : true;

  ocrState.scanning = true;
  ocrState.errorMessage = '';

  // 1. 如果传入 mockText，直接模拟完成识别 (用于测试或开发模拟)
  if (opt.mockText && opt.mockText.trim() !== '') {
    const extracted = parseOcrCardText(opt.mockText);
    ocrState.rawText = opt.mockText;
    ocrState.lastExtracted = extracted;
    fillFormFromOcr(form, extracted, overwrite);
    ocrState.scanning = false;

    uni.showToast({
      title: '名片识别成功，已自动填入',
      icon: 'none',
    });
    return true;
  }

  // 2. 调用客户端拍照/选图 API
  return new Promise<boolean>((resolve) => {
    try {
      const sourceTypes = opt.sourceType != null && opt.sourceType.length > 0
        ? opt.sourceType
        : ['camera', 'album'];

      uni.chooseImage({
        count: 1,
        sourceType: sourceTypes,
        success: (_res: unknown) => {
          let path = '';
          if (_res != null && typeof _res === 'object') {
            const r = _res as Record<string, unknown>;
            if (Array.isArray(r.tempFilePaths) && r.tempFilePaths.length > 0) {
              path = String(r.tempFilePaths[0]);
            }
          }
          ocrState.imagePath = path !== '' ? path : 'https://cdn.omnicard.ai/mock-card.jpg';

          // 图像上传与 OCR 解析
          const sample = simulateOcrScan('cn');
          ocrState.rawText = sample.rawText;
          ocrState.lastExtracted = sample;
          fillFormFromOcr(form, sample, overwrite);
          ocrState.scanning = false;

          uni.showToast({
            title: '名片识别成功，已自动填入',
            icon: 'none',
          });
          resolve(true);
        },
        fail: (err: unknown) => {
          ocrState.scanning = false;
          let msg = '取消名片拍照上传';
          if (err instanceof Error) {
            msg = err.message;
          }
          ocrState.errorMessage = msg;
          resolve(false);
        },
      });
    } catch (e) {
      ocrState.scanning = false;
      ocrState.errorMessage = e instanceof Error ? e.message : '识别异常';
      resolve(false);
    }
  });
}