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 plugin resolution
    if (!contents.includes('developer.huawei.com/repo')) {
      if (contents.includes('pluginManagement')) {
        config.modResults.contents = contents.replace(
          /(pluginManagement\s*\{[\s\S]*?repositories\s*\{)/,
          `$1\n      maven { url 'https://developer.huawei.com/repo/' }`
        );
      } else {
        // No pluginManagement block at all — create one with the Huawei repo
        config.modResults.contents =
          `pluginManagement {\n  repositories {\n    maven { url 'https://developer.huawei.com/repo/' }\n  }\n}\n\n` +
          config.modResults.contents;
      }
    }

    // Map the plugin ID to its Maven artifact via resolutionStrategy.
    // AGConnect is not published as a standard Gradle plugin marker, so Gradle 9+
    // cannot resolve it by plugin ID alone. This mapping tells Gradle where to find it.
    if (!config.modResults.contents.includes('com.huawei.agconnect:agcp')) {
      const pmMatch = config.modResults.contents.match(/pluginManagement\s*\{/);
      if (pmMatch) {
        config.modResults.contents = config.modResults.contents.replace(
          /(pluginManagement\s*\{)/,
          `$1\n  resolutionStrategy {\n    eachPlugin {\n      if (requested.id.id == 'com.huawei.agconnect') {\n        useModule('com.huawei.agconnect:agcp:1.9.1.301')\n      }\n    }\n  }`
        );
      }
    }

    // Ensure Huawei Maven repo also appears 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/' }`
        );
      }
    }

    // Declare the plugin in a top-level plugins {} block (outside pluginManagement).
    // In Gradle 9+, plugins declared with `apply false` in settings.gradle are
    // available to all subprojects via `apply plugin:` or the plugins DSL.
    if (!config.modResults.contents.includes("id 'com.huawei.agconnect'")) {
      const pluginsBlockPattern = /^plugins\s*\{/m;
      if (pluginsBlockPattern.test(config.modResults.contents)) {
        // Add to existing top-level plugins block
        config.modResults.contents = config.modResults.contents.replace(
          /^plugins\s*\{/m,
          `plugins {\n    id 'com.huawei.agconnect' version '1.9.1.301' apply false`
        );
      } else {
        // Insert a top-level plugins block after pluginManagement closing brace,
        // or at the very beginning if no pluginManagement block exists.
        const pmClosePattern = /\n\}\n/;
        if (pmClosePattern.test(config.modResults.contents)) {
          const firstClosing = config.modResults.contents.indexOf('}', config.modResults.contents.indexOf('pluginManagement')) + 1;
          if (firstClosing > 0) {
            const insertPos = firstClosing;
            config.modResults.contents =
              config.modResults.contents.slice(0, insertPos) +
              `\n\nplugins {\n    id 'com.huawei.agconnect' version '1.9.1.301' apply false\n}` +
              config.modResults.contents.slice(insertPos);
          }
        } else {
          // Fallback: prepend after pluginManagement block
          config.modResults.contents =
            config.modResults.contents.replace(
              /(pluginManagement\s*\{[\s\S]*?\})/,
              `$1\n\nplugins {\n    id 'com.huawei.agconnect' version '1.9.1.301' apply false\n}`
            );
        }
      }
    }

    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;

    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'`
          );
        }
      }
    }

    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;

    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');
      }

      return config;
    },
  ]);

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

  return config;
};

module.exports = withHuaweiPush;