var assert = require('assert');
var examples = require('./examples');
var base58 = require('..');

function exampleRunner(callback) {
	Object.keys(examples).forEach(function (str) {
		callback(str, examples[str]);
	});
}

describe('Base58', function () {

	before(function () {
		var valid = true;
		var count = 0;

		exampleRunner(function (str, num) {
			count++;
			if (typeof str !== 'string') {
				valid = false;
			}
			if (typeof num !== 'number') {
				valid = false;
			}
		});

		assert.strictEqual(count > 0, true, 'Expected there to be examples');
		assert.strictEqual(valid, true, 'Expected the examples to be valid');
	});

	describe('.encode', function () {
		it('encodes number to Base58 string', function () {
			exampleRunner(function (str, num) {
				assert.strictEqual(base58.encode(num), str);
			});
		});

		describe('when passed a string only containing numbers', function () {
			it('encodes string after first converting it to an integer', function () {
				exampleRunner(function (str, num) {
					assert.strictEqual(base58.encode(num.toString()), str);
				});
			});
		});

		describe('when passed a non number', function () {
			it('throws an error', function () {
				assert.throws(function () {
					base58.encode('hi');
				}, function (err) {
					return err.message === 'Value passed is not a non-negative safe integer.';
				});
			});
		});

		describe('when passed a float', function () {
			it('throws an error', function () {
				assert.throws(function () {
					base58.encode(3.14);
				}, function (err) {
					return err.message === 'Value passed is not a non-negative safe integer.';
				});
			});
		});
	});

	describe('.decode', function () {
		it('decodes base58 string to number', function () {
			exampleRunner(function (str, num) {
				assert.strictEqual(base58.decode(str), num);
			});
		});

		describe('when passed a non string', function () {
			it('throws an error', function () {
				assert.throws(function () {
					base58.decode(123);
				}, function (err) {
					return err.message === 'Value passed is not a string.';
				});
			});
		});

		describe('when passed a non base58 string', function () {
			it('throws an error', function () {
				assert.throws(function () {
					base58.decode('>_<');
				}, function (err) {
					return err.message === 'Value passed is not a valid Base58 string.';
				});
			});
		});
	});

});