export interface CodeBlock {
  readonly content: string;
  readonly language: string;
  readonly startLine: number;
  readonly endLine: number;
  readonly filePath: string;
  readonly metadata?: Record<string, unknown>;
}

export interface CodeBlockBuilder {
  content(content: string): CodeBlockBuilder;
  language(language: string): CodeBlockBuilder;
  startLine(startLine: number): CodeBlockBuilder;
  endLine(endLine: number): CodeBlockBuilder;
  filePath(filePath: string): CodeBlockBuilder;
  metadata(metadata: Record<string, unknown>): CodeBlockBuilder;
  build(): CodeBlock;
}

export class CodeBlockImpl implements CodeBlockBuilder {
  private block: any = {};

  content(content: string): CodeBlockBuilder {
    this.block.content = content;
    return this;
  }

  language(language: string): CodeBlockBuilder {
    this.block.language = language;
    return this;
  }

  startLine(startLine: number): CodeBlockBuilder {
    this.block.startLine = startLine;
    return this;
  }

  endLine(endLine: number): CodeBlockBuilder {
    this.block.endLine = endLine;
    return this;
  }

  filePath(filePath: string): CodeBlockBuilder {
    this.block.filePath = filePath;
    return this;
  }

  metadata(metadata: Record<string, unknown>): CodeBlockBuilder {
    this.block.metadata = metadata;
    return this;
  }

  build(): CodeBlock {
    if (!this.block.content || !this.block.language || 
        this.block.startLine === undefined || this.block.endLine === undefined || 
        !this.block.filePath) {
      throw new Error('Required fields missing for CodeBlock');
    }

    if (this.block.startLine > this.block.endLine) {
      throw new Error('Start line cannot be greater than end line');
    }

    const result: any = {
      content: this.block.content,
      language: this.block.language,
      startLine: this.block.startLine,
      endLine: this.block.endLine,
      filePath: this.block.filePath,
    };
    
    if (this.block.metadata) {
      result.metadata = this.block.metadata;
    }
    
    return result;
  }
}