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

const withHuaweiPush = (config, options = {}) => {
  const { jpushVersion = '5.8.0' } = options;

  config = withSettingsGradle(config, (config) => {
    const contents = config.modResults.contents;

    // Add Huawei Maven repo to pluginManagement.repositories for buildscript resolution.
    // NOTE: We intentionally do NOT add `plugins { id 'com.huawei.agconnect' ... }` here.
    // The Huawei agcp plugin transitively depends on agconnect-apms-plugin:1.6.2.300,
    // which depends on AGP 4.0.1. That old AGP references BuildCompletionListener (removed
    // from Gradle 8.x+), causing NoClassDefFoundError at build time. Instead, the plugin
    // is applied via buildscript classpath in build.gradle with the apms-plugin excluded.
    if (!contents.includes('developer.huawei.com/repo')) {
      const repoLine = `    maven { url 'https://developer.huawei.com/repo/' }`;
      const jigLine = `    maven { url 'https://developer.jiguang.cn/maven' }`;
      const hasPluginManagement = contents.includes('pluginManagement');
      const hasRepositoriesInPM = /pluginManagement\s*\{[\s\S]*?repositories\s*\{/.test(contents);

      if (hasRepositoriesInPM) {
        config.modResults.contents = contents.replace(
          /(pluginManagement\s*\{[\s\S]*?repositories\s*\{)/,
          `$1\n      ${repoLine}\n      ${jigLine}`
        );
      } else if (hasPluginManagement) {
        config.modResults.contents = contents.replace(
          /(pluginManagement\s*\{)/,
          `$1\n  repositories {\n    gradlePluginPortal()\n    google()\n    mavenCentral()\n    ${repoLine}\n    ${jigLine}\n  }`
        );
      } else {
        config.modResults.contents =
          `pluginManagement {\n  repositories {\n    ${repoLine}\n    ${jigLine}\n  }\n}\n\n` +
          config.modResults.contents;
      }
    }

    // Add Jiguang Maven repo to dependencyResolutionManagement (for jcore/jpush SDK)
    if (!contents.includes('developer.jiguang.cn/maven')) {
      const depMgmtPattern = /dependencyResolutionManagement\s*\{[\s\S]*?repositories\s*\{/;
      if (depMgmtPattern.test(config.modResults.contents)) {
        config.modResults.contents = config.modResults.contents.replace(
          depMgmtPattern,
          `$&\n        maven { url 'https://developer.jiguang.cn/maven' }`
        );
      }
    }

    // Ensure Huawei Maven repo in dependencyResolutionManagement (Gradle 9+)
    if (!config.modResults.contents.match(/dependencyResolutionManagement[\s\S]*developer\.huawei\.com\/repo/)) {
      const depMgmtPattern = /dependencyResolutionManagement\s*\{[\s\S]*?repositories\s*\{/;
      if (depMgmtPattern.test(config.modResults.contents)) {
        config.modResults.contents = config.modResults.contents.replace(
          depMgmtPattern,
          `$&\n        maven { url 'https://developer.huawei.com/repo/' }`
        );
      }
    }

    return config;
  });

  config = withProjectBuildGradle(config, (config) => {
    const contents = config.modResults.contents;

    if (!contents.includes('developer.huawei.com/repo')) {
      config.modResults.contents = contents.replace(
        /(repositories\s*\{)/g,
        (match) => {
          return match + `\n            maven { url 'https://developer.huawei.com/repo/' }`;
        }
      );
    }

    return config;
  });

  config = withProjectBuildGradle(config, (config) => {
    const contents = config.modResults.contents;

    // Add Huawei AGConnect classpath with apms-plugin excluded.
    // The apms-plugin transitively depends on AGP 4.0.1 which is incompatible
    // with Gradle 8.14+ (references removed BuildCompletionListener class).
    if (!contents.includes('com.huawei.agconnect:agcp')) {
      if (contents.includes('buildscript')) {
        const depsPattern = /(buildscript\s*\{[\s\S]*?dependencies\s*\{)/;
        if (depsPattern.test(contents)) {
          config.modResults.contents = contents.replace(
            depsPattern,
            `$1\n        classpath('com.huawei.agconnect:agcp:1.9.1.301') {\n          exclude group: 'com.huawei.agconnect', module: 'agconnect-apms-plugin'\n        }`
          );
        }
      }
    }

    // Set explicit AGP version (needed by Huawei plugin validation)
    if (!contents.includes('com.android.tools.build:gradle:8.12.0')) {
      config.modResults.contents = config.modResults.contents.replace(
        /classpath\(['"]com\.android\.tools\.build:gradle['"]\)/,
        "classpath('com.android.tools.build:gradle:8.12.0')"
      );
    }

    // Google Services plugin classpath — required for Firebase init via google-services.json.
    if (!contents.includes('com.google.gms:google-services')) {
      const depsPattern = /(buildscript\s*\{[\s\S]*?dependencies\s*\{[\s\S]*?classpath\(['"]org\.jetbrains\.kotlin:kotlin-gradle-plugin['"]\))/;
      if (depsPattern.test(config.modResults.contents)) {
        config.modResults.contents = config.modResults.contents.replace(
          depsPattern,
          `$1\n    classpath('com.google.gms:google-services:4.4.4')`
        );
      }
    }

    if (!config.modResults.contents.includes('developer.huawei.com/repo')) {
      const bsRepoPattern = /(buildscript\s*\{[\s\S]*?repositories\s*\{)/;
      if (bsRepoPattern.test(config.modResults.contents)) {
        config.modResults.contents = config.modResults.contents.replace(
          bsRepoPattern,
          `$1\n          maven { url 'https://developer.huawei.com/repo/' }`
        );
      }
    }

    return config;
  });

  config = withAppBuildGradle(config, (config) => {
    const contents = config.modResults.contents;

    // Apply Google Services plugin (Firebase) before the Huawei plugin.
    // The googleServicesFile in app.json only sets up the file copy + plugin
    // when run through `expo prebuild`, but it does not coexist with this
    // Huawei plugin reliably, so we apply it explicitly here.
    if (!contents.includes('com.google.gms.google-services')) {
      const reactApply = /apply plugin:\s*['"]com\.facebook\.react['"]\s*\n/;
      if (reactApply.test(contents)) {
        config.modResults.contents = contents.replace(
          reactApply,
          `apply plugin: "com.facebook.react"\napply plugin: 'com.google.gms.google-services'\n`
        );
      } else {
        config.modResults.contents = `apply plugin: 'com.google.gms.google-services'\n` + contents;
      }
    }

    if (!contents.includes('com.huawei.agconnect')) {
      const applyPluginPattern = /apply plugin:\s*['"]com\.google\.gms\.google-services['"]/;
      if (applyPluginPattern.test(contents)) {
        config.modResults.contents = contents.replace(
          applyPluginPattern,
          `apply plugin: 'com.google.gms.google-services'\napply plugin: 'com.huawei.agconnect'`
        );
      } else {
        const lastApplyPlugin = /apply plugin:[^\n]*(?:\n)/g;
        const matches = contents.match(lastApplyPlugin);
        if (matches && matches.length > 0) {
          const lastMatch = matches[matches.length - 1];
          const lastIndex = contents.lastIndexOf(lastMatch);
          config.modResults.contents =
            contents.slice(0, lastIndex + lastMatch.length) +
            "apply plugin: 'com.huawei.agconnect'\n" +
            contents.slice(lastIndex + lastMatch.length);
        } else {
          config.modResults.contents = contents + "\napply plugin: 'com.huawei.agconnect'\n";
        }
      }
    }

    if (!contents.includes('cn.jiguang.sdk.plugin:huawei')) {
      const depsPattern = /dependencies\s*\{/;
      if (depsPattern.test(config.modResults.contents)) {
        config.modResults.contents = config.modResults.contents.replace(
          depsPattern,
          `dependencies {\n    implementation 'cn.jiguang.sdk.plugin:huawei:${jpushVersion}'`
        );
      }
    }

    return config;
  });

  config = withDangerousMod(config, [
    'android',
    async (config) => {
      const appDir = path.join(config.modRequest.platformProjectRoot, 'app');
      const srcFile = path.join(config.modRequest.projectRoot, 'plugins', 'agconnect-services.json');
      const destFile = path.join(appDir, 'agconnect-services.json');

      if (fs.existsSync(srcFile)) {
        fs.copyFileSync(srcFile, destFile);
        console.log('[withHuaweiPush] copied agconnect-services.json to android/app/');
      } else {
        console.warn('[withHuaweiPush] agconnect-services.json not found at project root');
      }

      // Copy google-services.json to android/app/ so the Google Services
      // Gradle plugin can find it. Without this, FCM / Firebase init fails
      // at runtime with "default FirebaseApp is not initialized".
      const gmsSrc = path.join(config.modRequest.projectRoot, 'google-services.json');
      const gmsDest = path.join(appDir, 'google-services.json');
      if (fs.existsSync(gmsSrc)) {
        fs.copyFileSync(gmsSrc, gmsDest);
        console.log('[withHuaweiPush] copied google-services.json to android/app/');
      } else {
        console.warn('[withHuaweiPush] google-services.json not found at project root');
      }

      // RN 0.85.3 ships Gradle 9.3.1 in its template, but Kotlin 2.1.20 is incompatible
      // with Gradle 9.x (CompilerEnvironment ClassNotFoundException). Downgrade to 8.14.5.
      const wrapperFile = path.join(config.modRequest.platformProjectRoot, 'gradle', 'wrapper', 'gradle-wrapper.properties');
      if (fs.existsSync(wrapperFile)) {
        let wrapper = fs.readFileSync(wrapperFile, 'utf8');
        if (wrapper.includes('gradle-9.')) {
          wrapper = wrapper.replace(/gradle-[\d.]+-bin\.zip/, 'gradle-8.14.5-bin.zip');
          fs.writeFileSync(wrapperFile, wrapper);
          console.log('[withHuaweiPush] downgraded Gradle to 8.14.5 for Kotlin 2.1.20 compatibility');
        }
      }

      // Ensure local.properties with SDK path exists (gets cleared on prebuild --clean)
      const localPropsFile = path.join(config.modRequest.platformProjectRoot, 'local.properties');
      if (!fs.existsSync(localPropsFile)) {
        const homeDir = process.env.USERPROFILE || process.env.HOME || '';
        const sdkPath = path.join(homeDir, 'AppData', 'Local', 'Android', 'Sdk');
        if (fs.existsSync(sdkPath)) {
          fs.writeFileSync(localPropsFile, `sdk.dir=${sdkPath.replace(/\\/g, '\\\\')}\n`);
          console.log('[withHuaweiPush] created local.properties with SDK path');
        }
      }

      return config;
    },
  ]);

  config = withAndroidManifest(config, (config) => {
    return config;
  });

  return config;
};

module.exports = withHuaweiPush;