import fs from 'fs-extra';
import yaml from 'js-yaml';
import { logStep, logInfo, logError } from '../utils/logger';
import type { SwaggerAnalysis } from '../types';

/** Parses an OpenAPI/Swagger file and extracts tags, paths and the full document. */
export function analyzeSwagger(swaggerFile: string): SwaggerAnalysis {
  logStep('Analysing OpenAPI file...');

  try {
    const fileContent = fs.readFileSync(swaggerFile, 'utf8');
    const swagger = yaml.load(fileContent) as Record<string, unknown>;

    const tags = Array.isArray(swagger.tags) ? swagger.tags : [];
    const paths = (swagger.paths as Record<string, unknown>) || {};

    logInfo(`Found ${tags.length} tags in the API`);
    logInfo(`Found ${Object.keys(paths).length} endpoints`);

    tags.forEach((tag: unknown) => {
      const t = tag as { name: string; description?: string };
      logInfo(`  - ${t.name}: ${t.description || 'No description'}`);
    });

    return { tags, paths, swagger };
  } catch (error: unknown) {
    const err = error as Error;
    logError(`Error reading the Swagger file: ${err.message}`);
    process.exit(1);
  }
}