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/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

import * as dotenv from 'dotenv';
import * as fs from 'node:fs';
import * as path from 'node:path';
import process from 'node:process';

const DEFAULT_PASSTHROUGH_COMMANDS = ['ls', 'git', 'npm'];

export class Config {
  private apiKey: string;
  private model: string;
  private targetDir: string;
  private debugMode: boolean;
  private passthroughCommands: string[];

  constructor(
    apiKey: string,
    model: string,
    targetDir: string,
    debugMode: boolean,
    passthroughCommands?: string[],
  ) {
    this.apiKey = apiKey;
    this.model = model;
    this.targetDir = targetDir;
    this.debugMode = debugMode;
    this.passthroughCommands =
      passthroughCommands || DEFAULT_PASSTHROUGH_COMMANDS;
  }

  getApiKey(): string {
    return this.apiKey;
  }

  getModel(): string {
    return this.model;
  }

  getTargetDir(): string {
    return this.targetDir;
  }

  getDebugMode(): boolean {
    return this.debugMode;
  }

  getPassthroughCommands(): string[] {
    return this.passthroughCommands;
  }
}

function findEnvFile(startDir: string): string | null {
  let currentDir = path.resolve(startDir);
  while (true) {
    const envPath = path.join(currentDir, '.env');
    if (fs.existsSync(envPath)) {
      return envPath;
    }
    const parentDir = path.dirname(currentDir);
    if (parentDir === currentDir || !parentDir) {
      return null;
    }
    currentDir = parentDir;
  }
}

export function loadEnvironment(): void {
  const envFilePath = findEnvFile(process.cwd());
  if (!envFilePath) {
    return;
  }
  dotenv.config({ path: envFilePath });
}

export function createServerConfig(
  apiKey: string,
  model: string,
  targetDir: string,
  debugMode: boolean,
  passthroughCommands?: string[],
): Config {
  return new Config(
    apiKey,
    model,
    path.resolve(targetDir),
    debugMode,
    passthroughCommands,
  );
}