// Flags: --expose_internals
'use strict';
const common = require('../common');
const assert = require('assert');
const internalUtil = require('internal/util');
const binding = process.binding('util');
const spawnSync = require('child_process').spawnSync;
const path = require('path');

const kArrowMessagePrivateSymbolIndex = binding['arrow_message_private_symbol'];
const kDecoratedPrivateSymbolIndex = binding['decorated_private_symbol'];

const decorateErrorStack = internalUtil.decorateErrorStack;

assert.doesNotThrow(function() {
  decorateErrorStack();
  decorateErrorStack(null);
  decorateErrorStack(1);
  decorateErrorStack(true);
});

// Verify that a stack property is not added to non-Errors
const obj = {};
decorateErrorStack(obj);
assert.strictEqual(obj.stack, undefined);

// Verify that the stack is decorated when possible
function checkStack(stack) {
  const matches = stack.match(/var foo bar;/g);
  assert.strictEqual(Array.isArray(matches), true);
  assert.strictEqual(matches.length, 1);
}
let err;
const badSyntaxPath =
    path.join(common.fixturesDir, 'syntax', 'bad_syntax')
        .replace(/\\/g, '\\\\');

try {
  require(badSyntaxPath);
} catch (e) {
  err = e;
}

assert(typeof err, 'object');
checkStack(err.stack);

// Verify that the stack is only decorated once
decorateErrorStack(err);
decorateErrorStack(err);
checkStack(err.stack);

// Verify that the stack is only decorated once for uncaught exceptions
const args = [
  '-e',
  `require('${badSyntaxPath}')`
];
const result = spawnSync(process.argv[0], args, { encoding: 'utf8' });
checkStack(result.stderr);

// Verify that the stack is unchanged when there is no arrow message
err = new Error('foo');
let originalStack = err.stack;
decorateErrorStack(err);
assert.strictEqual(originalStack, err.stack);

// Verify that the arrow message is added to the start of the stack when it
// exists
const arrowMessage = 'arrow_message';
err = new Error('foo');
originalStack = err.stack;

binding.setHiddenValue(err, kArrowMessagePrivateSymbolIndex, arrowMessage);
decorateErrorStack(err);

assert.strictEqual(err.stack, `${arrowMessage}${originalStack}`);
assert.strictEqual(
  binding.getHiddenValue(err, kDecoratedPrivateSymbolIndex), true);