/**
 * 无障碍服务 Config Plugin（plan.md「3.6 无障碍服务」+「决策 4」）。
 *
 * 在 expo prebuild 时注册 Android 无障碍服务（manifest service + xml 配置）。
 * 参考 AutoAccounting 的 SelectToSpeakService 伪装机制（侧载保留，plan.md 决策 3）。
 *
 * 注意：withAndroidManifest 的 modResults 结构是 { manifest: { ... } }，
 * 操作 application 必须通过 modResults.manifest.application。
 */

const { withAndroidManifest, withDangerousMod, withMainApplication } = require('@expo/config-plugins');
const fs = require('fs');
const path = require('path');

const PACKAGE = 'com.beancount.mobile.accessibility';

/** 递归复制目录。 */
function copyDir(src, dest) {
  if (!fs.existsSync(src)) return;
  fs.mkdirSync(dest, { recursive: true });
  for (const entry of fs.readdirSync(src)) {
    const s = path.join(src, entry);
    const d = path.join(dest, entry);
    if (fs.statSync(s).isDirectory()) copyDir(s, d);
    else fs.copyFileSync(s, d);
  }
}

function withAccessibilityService(config) {
  // 1. 复制 Kotlin 源码 + res/xml 资源到原生工程
  config = withDangerousMod(config, [
    'android',
    async (modConfig) => {
      const projectRoot = modConfig.modRequest.platformProjectRoot;
      // Kotlin 源码（只复制 .kt 文件，不含 res/ 子目录）
      const ktDest = path.join(projectRoot, 'app/src/main/java/com/beancount/mobile/accessibility');
      fs.mkdirSync(ktDest, { recursive: true });
      const androidDir = path.join(__dirname, 'android');
      for (const f of fs.readdirSync(androidDir)) {
        if (f.endsWith('.kt')) {
          fs.copyFileSync(path.join(androidDir, f), path.join(ktDest, f));
        }
      }
      // res/xml 资源
      const resSrc = path.join(__dirname, 'android/res');
      if (fs.existsSync(resSrc)) {
        copyDir(resSrc, path.join(projectRoot, 'app/src/main/res'));
      }
      // 确保有 accessibility_service_description 字符串资源
      const stringsXmlPath = path.join(projectRoot, 'app/src/main/res/values/strings.xml');
      if (fs.existsSync(stringsXmlPath)) {
        let content = fs.readFileSync(stringsXmlPath, 'utf8');
        if (!content.includes('accessibility_service_description')) {
          content = content.replace(
            /<\/resources>/,
            '  <string name="accessibility_service_description">自动识别支付账单页面，辅助快速记账</string>\n</resources>',
          );
          fs.writeFileSync(stringsXmlPath, content, 'utf8');
        }
      }
      return modConfig;
    },
  ]);

  // 2. 注入 ReactContextHolder 赋值 + 注册 AccessibilityBridgePackage 到 MainApplication
  config = withMainApplication(config, (modConfig) => {
    let content = modConfig.modResults.contents;

    // 2a. 注入 import（ReactContextHolder + AccessibilityBridgePackage）
    if (!content.includes(`import ${PACKAGE}.ReactContextHolder`)) {
      content = content.replace(
        /^(package\s+[\w.]+;?\s*)$/m,
        `$1\nimport ${PACKAGE}.ReactContextHolder\nimport ${PACKAGE}.AccessibilityBridgePackage`,
      );
    } else if (!content.includes(`import ${PACKAGE}.AccessibilityBridgePackage`)) {
      content = content.replace(
        `import ${PACKAGE}.ReactContextHolder`,
        `import ${PACKAGE}.ReactContextHolder\nimport ${PACKAGE}.AccessibilityBridgePackage`,
      );
    }

    // 2b. 在 onCreate 方法中注入 ReactContextHolder.context = this
    if (!content.includes('ReactContextHolder.context')) {
      // 尝试在 super.onCreate() 后注入
      if (/super\.onCreate\(\)/.test(content)) {
        content = content.replace(
          /(super\.onCreate\(\))/,
          `$1\n        // 由 Config Plugin 注入：让原生服务能访问 RN 上下文\n        ReactContextHolder.context = this`,
        );
      } else if (/onCreate/.test(content)) {
        // 有 onCreate 但没有 super.onCreate()（不太可能）
        content = content.replace(
          /(onCreate[^{]*\{)/,
          `$1\n        ReactContextHolder.context = this`,
        );
      } else {
        // 没有 onCreate — 在类体内注入一个
        content = content.replace(
          /(class\s+MainApplication\s*[^{]*\{)/,
          `$1\n  override fun onCreate() {\n    super.onCreate()\n    ReactContextHolder.context = this\n  }`,
        );
      }
    }

    // 2c. 在 getPackages() 的 .apply {} 块里注入 add(AccessibilityBridgePackage())
    if (!content.includes('add(AccessibilityBridgePackage())')) {
      if (/PackageList\(this\)\.packages\.apply\s*\{/.test(content)) {
        content = content.replace(
          /(PackageList\(this\)\.packages\.apply\s*\{)/,
          `$1\n              add(AccessibilityBridgePackage())`,
        );
      } else if (/PackageList\(this\)\.packages\b/.test(content)) {
        content = content.replace(
          /PackageList\(this\)\.packages\b/,
          `PackageList(this).packages.apply { add(AccessibilityBridgePackage()) }`,
        );
      }
    }

    modConfig.modResults.contents = content;
    return modConfig;
  });

  // 3. 注册服务到 AndroidManifest
  config = withAndroidManifest(config, (modConfig) => {
    const manifest = modConfig.modResults.manifest;

    // 1. 添加无障碍服务声明
    const serviceNode = {
      $: {
        'android:name': 'com.beancount.mobile.accessibility.BillingAccessibilityService',
        'android:permission': 'android.permission.BIND_ACCESSIBILITY_SERVICE',
        'android:label': '账单识别',
        'android:exported': 'false',
      },
      'intent-filter': [{
        action: [{ $: { 'android:name': 'android.accessibilityservice.AccessibilityService' } }],
      }],
      'meta-data': [{
        $: {
          'android:name': 'android.accessibilityservice',
          'android:resource': '@xml/accessibility_service_config',
        },
      }],
    };

    // 2. 确保 application[0] 存在
    if (!Array.isArray(manifest.application) || manifest.application.length === 0) {
      manifest.application = [{ $: {} }];
    }
    const app = manifest.application[0];
    if (!app.service) {
      app.service = [];
    }
    const exists = app.service.some(
      s => s.$['android:name'] === 'com.beancount.mobile.accessibility.BillingAccessibilityService'
    );
    if (!exists) {
      app.service.push(serviceNode);
    }

    // 3. 添加 OcrTileService 声明（快速设置磁贴，plan.md「3.11」）
    const tileServiceNode = {
      $: {
        'android:name': 'com.beancount.mobile.accessibility.OcrTileService',
        'android:label': 'OCR 记账',
        'android:icon': '@android:drawable/ic_menu_camera',
        'android:permission': 'android.permission.BIND_QUICK_SETTINGS_TILE',
        'android:exported': 'true',
      },
      'intent-filter': [{
        action: [{ $: { 'android:name': 'android.service.quicksettings.action.QS_TILE' } }],
      }],
    };
    const tileExists = app.service.some(
      s => s.$['android:name'] === 'com.beancount.mobile.accessibility.OcrTileService'
    );
    if (!tileExists) {
      app.service.push(tileServiceNode);
    }

    return modConfig;
  });

  return config;
}

module.exports = withAccessibilityService;