/**
 * Converts a string to PascalCase, handling spaces, hyphens and underscores.
 * Used to derive class names from schema/tag names.
 *
 * @example
 * toPascalCase('Product Format')  // 'ProductFormat'
 * toPascalCase('user-response')   // 'UserResponse'
 * toPascalCase('UserSchema')      // 'UserSchema'
 */
export function toPascalCase(name: string): string {
  if (!name) return name;
  return name
    .split(/[\s\-_]+/)
    .map((word) => word.charAt(0).toUpperCase() + word.slice(1))
    .join('');
}

/**
 * Converts a string to camelCase, handling spaces, hyphens and underscores.
 * Used to derive class filenames and variable names from schema/tag names.
 *
 * @example
 * toCamelCase('Product Format')  // 'productFormat'
 * toCamelCase('ProductResponse') // 'productResponse'
 * toCamelCase('UserSchema')      // 'userSchema'
 */
export function toCamelCase(name: string): string {
  if (!name) return name;
  const pascal = toPascalCase(name);
  return pascal.charAt(0).toLowerCase() + pascal.slice(1);
}

const JS_RESERVED_WORDS = new Set([
  'abstract',
  'arguments',
  'await',
  'boolean',
  'break',
  'byte',
  'case',
  'catch',
  'char',
  'class',
  'const',
  'continue',
  'debugger',
  'default',
  'delete',
  'do',
  'double',
  'else',
  'enum',
  'eval',
  'export',
  'extends',
  'false',
  'final',
  'finally',
  'float',
  'for',
  'function',
  'goto',
  'if',
  'implements',
  'import',
  'in',
  'instanceof',
  'int',
  'interface',
  'let',
  'long',
  'native',
  'new',
  'null',
  'package',
  'private',
  'protected',
  'public',
  'return',
  'short',
  'static',
  'super',
  'switch',
  'synchronized',
  'this',
  'throw',
  'throws',
  'transient',
  'true',
  'try',
  'typeof',
  'undefined',
  'var',
  'void',
  'volatile',
  'while',
  'with',
  'yield'
]);

/** Returns true if the given name is a JS/TS reserved word. */
export function isReservedWord(name: string): boolean {
  return JS_RESERVED_WORDS.has(name);
}

/** Prefixes reserved words with `_` to produce a safe identifier. */
export function safePropertyName(name: string): string {
  return isReservedWord(name) ? `_${name}` : name;
}