const path = require('path');
const { execSync } = require('child_process');
const readline = require('readline');

const IMAGE_TYPES = {
  IPHONE: 'iphone',
  SONY: 'sony',
  XIAOMI: 'xiaomi',
  SCREENSHOT: 'screenshot',
};

const IMAGE_TYPE_LABELS = {
  [IMAGE_TYPES.IPHONE]: '📱 iPhone (4:3)',
  [IMAGE_TYPES.SONY]: '📷 索尼相机 (3:2)',
  [IMAGE_TYPES.XIAOMI]: '📱 小米手机 (4:3)',
  [IMAGE_TYPES.SCREENSHOT]: '🖼️  截图 → WebP',
};

// 创建 readline 接口
function createInterface() {
  return readline.createInterface({
    input: process.stdin,
    output: process.stdout
  });
}

// 提问函数
function question(rl, prompt) {
  return new Promise((resolve) => {
    rl.question(prompt, resolve);
  });
}

// 获取图片尺寸
function getImageDimensions(filePath) {
  try {
    const width = execSync(`identify -format "%w" "${filePath}"`, { encoding: 'utf-8' }).trim();
    const height = execSync(`identify -format "%h" "${filePath}"`, { encoding: 'utf-8' }).trim();
    return { width: parseInt(width), height: parseInt(height) };
  } catch (error) {
    console.error(`获取图片尺寸失败: ${filePath}`);
    throw error;
  }
}

// 读取 EXIF 中的 Make / Model
function getExifMakeModel(filePath) {
  try {
    const output = execSync(`exiftool -Make -Model -s3 "${filePath}"`, { encoding: 'utf-8' }).trim();
    const [make = '', model = ''] = output.split('\n');
    return { make: make.trim(), model: model.trim() };
  } catch {
    return { make: '', model: '' };
  }
}

// 根据宽高比推断 iPhone (4:3) 或索尼 (3:2)
function detectTypeFromAspectRatio(width, height) {
  const ratio = Math.max(width, height) / Math.min(width, height);
  const diff43 = Math.abs(ratio - 4 / 3);
  const diff32 = Math.abs(ratio - 3 / 2);
  return diff43 <= diff32 ? IMAGE_TYPES.IPHONE : IMAGE_TYPES.SONY;
}

// 检测图片类型：iPhone / 索尼相机 / 截图
function detectImageType(filePath, dimensions) {
  const ext = path.extname(filePath).toLowerCase();

  if (ext === '.png') {
    return { type: IMAGE_TYPES.SCREENSHOT, reason: 'PNG 格式' };
  }

  const { make, model } = getExifMakeModel(filePath);
  const makeUpper = make.toUpperCase();
  const modelUpper = model.toUpperCase();

  // 我的 iPhone
  if (makeUpper === 'APPLE' || modelUpper.includes('IPHONE')) {
    return { type: IMAGE_TYPES.IPHONE, reason: `EXIF: ${make} ${model}`.trim() };
  }

  // 老妈小米 11 青春版
  if (makeUpper === 'XIAOMI' || modelUpper.includes('M2101K9C')) {
    return { type: IMAGE_TYPES.XIAOMI, reason: `EXIF: ${make} ${model}`.trim() };
  }

  // 索尼相机
  if (makeUpper.includes('SONY') || modelUpper.includes('ILCE') || modelUpper.startsWith('DSC-')) {
    return { type: IMAGE_TYPES.SONY, reason: `EXIF: ${make} ${model}`.trim() };
  }

  // iPhone
  if (['.heic', '.heif'].includes(ext)) {
    return { type: IMAGE_TYPES.IPHONE, reason: 'HEIC/HEIF 格式' };
  }

  const { width, height } = dimensions;
  const type = detectTypeFromAspectRatio(width, height);
  return { type, reason: `宽高比推断 (${width}x${height})` };
}

// 根据类型和方向获取目标尺寸，截图为 null（不裁剪）
// 索尼返回 ImageMagick 缩放规格（如 2250x），按原图宽高比缩放、不裁剪
function getTargetSize(type, width, height) {
  const landscape = width >= height;

  switch (type) {
    case IMAGE_TYPES.IPHONE:
      return { size: landscape ? '2000x1500' : '1500x2000', crop: true };
    case IMAGE_TYPES.SONY:
      return { size: landscape ? '2250x' : 'x2250', crop: false };
    case IMAGE_TYPES.SCREENSHOT:
      return null;
    default:
      return { size: landscape ? '2250x1500' : '1500x2250', crop: true };
  }
}

// 获取输出扩展名
function getOutputExtension(type) {
  return type === IMAGE_TYPES.SCREENSHOT ? '.webp' : '.jpg';
}

// 规范化文件名（去掉 -Modified 或 _Modified 后缀）
function normalizeBasename(name) {
  // 匹配 -Modified 或 _Modified（不区分大小写）
  const match = name.match(/^(.*?)[-_]?modified$/i);
  if (match && match[1]) {
    return match[1];
  }
  return name;
}

// 显示菜单并获取选择
async function showMenu(rl, title, options) {
  console.log(`\n${title}`);
  console.log('='.repeat(50));
  options.forEach((option, index) => {
    console.log(`${index + 1}. ${option}`);
  });

  const choice = await question(rl, '\n请选择 (输入数字): ');
  const index = parseInt(choice) - 1;

  if (index >= 0 && index < options.length) {
    return index;
  }
  return -1;
}

module.exports = {
  createInterface,
  question,
  getImageDimensions,
  getExifMakeModel,
  detectImageType,
  detectTypeFromAspectRatio,
  getTargetSize,
  getOutputExtension,
  normalizeBasename,
  showMenu,
  IMAGE_TYPES,
  IMAGE_TYPE_LABELS,
};