import * as plugins from './plugins.js';
import * as paths from '../paths.js';
import * as interfaces from '../interfaces/index.js';

export class Base64TsOutput {
  private files: interfaces.IBase64File[] = [];
  private cwd: string;

  constructor(cwd: string = paths.cwd) {
    this.cwd = cwd;
  }

  /**
   * Add a file with its content to the output
   */
  public addFile(filePath: string, content: Buffer | string): void {
    const contentBuffer = typeof content === 'string' ? Buffer.from(content, 'utf-8') : content;
    const contentBase64 = contentBuffer.toString('base64');
    this.files.push({
      path: filePath,
      contentBase64,
    });
  }

  /**
   * Add files matching a glob pattern
   */
  public async addFilesFromGlob(pattern: string): Promise<void> {
    const absolutePattern = plugins.smartpath.transform.toAbsolute(pattern, this.cwd) as string;
    const patternDir = plugins.path.dirname(absolutePattern);
    const patternBase = plugins.path.basename(absolutePattern);

    // Check if it's a directory pattern or file pattern
    const isGlobPattern = patternBase.includes('*');

    if (isGlobPattern) {
      // Handle glob patterns
      const dirPath = patternDir.replace(/\/\*\*$/, '');
      const dirExists = await plugins.fs.directory(dirPath).exists();
      if (!dirExists) {
        console.log(`Directory does not exist: ${dirPath}`);
        return;
      }

      const isRecursive = pattern.includes('**');
      let entries;
      if (isRecursive) {
        entries = await plugins.fs.directory(dirPath).recursive().list();
      } else {
        entries = await plugins.fs.directory(dirPath).list();
      }

      // Filter by pattern if needed
      const filePattern = patternBase.replace('*', '.*');
      const regex = new RegExp(filePattern);

      for (const entry of entries) {
        if (!entry.isDirectory && regex.test(entry.name)) {
          const fullPath = plugins.path.join(dirPath, entry.path);
          const relativePath = plugins.path.relative(this.cwd, fullPath);
          const content = await plugins.fs.file(fullPath).read();
          this.addFile(relativePath, content);
        }
      }
    } else {
      // Handle single file path
      const fileExists = await plugins.fs.file(absolutePattern).exists();
      if (!fileExists) {
        console.log(`File does not exist: ${absolutePattern}`);
        return;
      }
      const relativePath = plugins.path.relative(this.cwd, absolutePattern);
      const content = await plugins.fs.file(absolutePattern).read();
      this.addFile(relativePath, content);
    }
  }

  /**
   * Generate TypeScript file content
   * @param maxLineLength - Max chars per line for base64 strings. 0 or undefined = unlimited (default)
   */
  public generateTypeScript(maxLineLength?: number): string {
    // Default behavior: no line splitting (unlimited)
    if (!maxLineLength || maxLineLength <= 0) {
      const filesJson = JSON.stringify(this.files, null, 2);
      return `// Auto-generated by tsbundle - do not edit
export const files: { path: string; contentBase64: string }[] = ${filesJson};
`;
    }

    // Split base64 strings into chunks when maxLineLength is specified
    const formatBase64 = (base64: string): string => {
      if (base64.length <= maxLineLength) {
        return `"${base64}"`;
      }

      const chunks: string[] = [];
      for (let i = 0; i < base64.length; i += maxLineLength) {
        chunks.push(base64.slice(i, i + maxLineLength));
      }

      return `"" +\n      "${chunks.join('" +\n      "')}"`;
    };

    const filesFormatted = this.files.map(file => {
      return `  {
    "path": "${file.path}",
    "contentBase64": ${formatBase64(file.contentBase64)}
  }`;
    }).join(',\n');

    return `// Auto-generated by tsbundle - do not edit
export const files: { path: string; contentBase64: string }[] = [
${filesFormatted}
];
`;
  }

  /**
   * Write the TypeScript file to disk
   * @param outputPath - Output file path
   * @param maxLineLength - Max chars per line for base64 strings. 0 or undefined = unlimited (default)
   */
  public async writeToFile(outputPath: string, maxLineLength?: number): Promise<void> {
    const absolutePath = plugins.smartpath.transform.toAbsolute(outputPath, this.cwd) as string;
    const outputDir = plugins.path.dirname(absolutePath);
    await plugins.fs.directory(outputDir).create();
    const content = this.generateTypeScript(maxLineLength);
    await plugins.fs.file(absolutePath).encoding('utf8').write(content);
    console.log(`Generated base64ts output: ${outputPath}`);
  }

  /**
   * Get all collected files
   */
  public getFiles(): interfaces.IBase64File[] {
    return this.files;
  }

  /**
   * Clear all collected files
   */
  public clear(): void {
    this.files = [];
  }
}