const fs = require('fs');
const path = require('path');
const jsYaml = require('js-yaml');

function extractYaml(filePath, repoRoot) {
  const sourceCode = fs.readFileSync(filePath, 'utf8');
  const relPath = path.relative(repoRoot, filePath);
  const moduleId = relPath;
  const entities = [];
  const relationships = [];

  entities.push({
    id: moduleId,
    type: 'Config',
    name: relPath,
    kind: 'yaml-config',
    visibility: 'public',
    line_range: [1, sourceCode.split('\n').length]
  });

  try {
    // Attempt to load multiple documents
    const docs = jsYaml.loadAll(sourceCode);
    let lineNum = 1;
    for (const doc of docs) {
      if (doc && typeof doc === 'object') {
        for (const key of Object.keys(doc)) {
          const keyId = `${moduleId}:${key}`;
          entities.push({
            id: keyId,
            type: 'Config',
            name: key,
            kind: 'yaml-key',
            visibility: 'public',
            line_range: [lineNum, lineNum] // Approximation without AST
          });
          relationships.push({
            type: 'CONTAINS',
            source: moduleId,
            target: keyId
          });
        }
      }
    }
  } catch (e) {
    // Log warning, return base module
    console.error(`YAML parse error in ${relPath}: ${e.message}`);
  }

  return { file: filePath, language: 'yaml', entities, relationships };
}

function extractHcl(filePath, repoRoot) {
  const sourceCode = fs.readFileSync(filePath, 'utf8');
  const relPath = path.relative(repoRoot, filePath);
  const moduleId = relPath;
  const entities = [];
  const relationships = [];
  const lines = sourceCode.split('\n');

  entities.push({
    id: moduleId,
    type: 'Config',
    name: relPath,
    kind: 'terraform',
    visibility: 'public',
    line_range: [1, lines.length]
  });

  // Regex for top-level HCL blocks (e.g., resource "aws_s3_bucket" "my_bucket" {)
  const blockRegex = /^(resource|data|module|variable|output|provider)\s+"([^"]+)"(?:\s+"([^"]+)")?\s*\{/;
  
  for (let i = 0; i < lines.length; i++) {
    const match = lines[i].match(blockRegex);
    if (match) {
      const type = match[1];
      const name1 = match[2];
      const name2 = match[3];
      const fullName = name2 ? `${type}.${name1}.${name2}` : `${type}.${name1}`;
      const blockId = `${moduleId}:${fullName}`;
      
      entities.push({
        id: blockId,
        type: 'Config',
        name: fullName,
        kind: 'hcl-block',
        visibility: 'public',
        line_range: [i + 1, i + 1] // Approximation
      });
      
      relationships.push({
        type: 'CONTAINS',
        source: moduleId,
        target: blockId
      });
    }
  }

  return { file: filePath, language: 'hcl', entities, relationships };
}

module.exports = { extractYaml, extractHcl };