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// Copyright (c) 2012, Mark Cavage. All rights reserved.

// Copyright 2015 Joyent, Inc.

var assert = require('assert');

var Stream = require('stream').Stream;

var util = require('util');

///--- Globals

/* JSSTYLED */

var UUID_REGEXP = /^[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}$/;

///--- Internal

function _capitalize(str) {

return (str.charAt(0).toUpperCase() + str.slice(1));

}

function _toss(name, expected, oper, arg, actual) {

throw new assert.AssertionError({

message: util.format('%s (%s) is required', name, expected),

actual: (actual === undefined) ? typeof (arg) : actual(arg),

expected: expected,

operator: oper || '===',

stackStartFunction: _toss.caller

});

}

function _getClass(arg) {

return (Object.prototype.toString.call(arg).slice(8, -1));

}

function noop() {

// Why even bother with asserts?

}

///--- Exports

var types = {

bool: {

check: function (arg) { return typeof (arg) === 'boolean'; }

},

func: {

check: function (arg) { return typeof (arg) === 'function'; }

},

string: {

check: function (arg) { return typeof (arg) === 'string'; }

},

object: {

check: function (arg) {

return typeof (arg) === 'object' && arg !== null;

}

},

number: {

check: function (arg) {

return typeof (arg) === 'number' && !isNaN(arg);

}

},

finite: {

check: function (arg) {

return typeof (arg) === 'number' && !isNaN(arg) && isFinite(arg);

}

},

buffer: {

check: function (arg) { return Buffer.isBuffer(arg); },

operator: 'Buffer.isBuffer'

},

array: {

check: function (arg) { return Array.isArray(arg); },

operator: 'Array.isArray'

},

stream: {

check: function (arg) { return arg instanceof Stream; },

operator: 'instanceof',

actual: _getClass

},

date: {

check: function (arg) { return arg instanceof Date; },

operator: 'instanceof',

actual: _getClass

},

regexp: {

check: function (arg) { return arg instanceof RegExp; },

operator: 'instanceof',

actual: _getClass

},

uuid: {

check: function (arg) {

return typeof (arg) === 'string' && UUID_REGEXP.test(arg);

},

operator: 'isUUID'

}

};

function _setExports(ndebug) {

var keys = Object.keys(types);

var out;

/* re-export standard assert */

if (process.env.NODE_NDEBUG) {

out = noop;

} else {

out = function (arg, msg) {

if (!arg) {

_toss(msg, 'true', arg);

}

};

}

/* standard checks */

keys.forEach(function (k) {

if (ndebug) {

out[k] = noop;

return;

}

var type = types[k];

out[k] = function (arg, msg) {

if (!type.check(arg)) {

_toss(msg, k, type.operator, arg, type.actual);

}

};

});

/* optional checks */

keys.forEach(function (k) {

var name = 'optional' + _capitalize(k);

if (ndebug) {

out[name] = noop;

return;

}

var type = types[k];

out[name] = function (arg, msg) {

if (arg === undefined || arg === null) {

return;

}

if (!type.check(arg)) {

_toss(msg, k, type.operator, arg, type.actual);

}

};

});

/* arrayOf checks */

keys.forEach(function (k) {

var name = 'arrayOf' + _capitalize(k);

if (ndebug) {

out[name] = noop;

return;

}

var type = types[k];

var expected = '[' + k + ']';

out[name] = function (arg, msg) {

if (!Array.isArray(arg)) {

_toss(msg, expected, type.operator, arg, type.actual);

}

var i;

for (i = 0; i < arg.length; i++) {

if (!type.check(arg[i])) {

_toss(msg, expected, type.operator, arg, type.actual);

}

}

};

});

/* optionalArrayOf checks */

keys.forEach(function (k) {

var name = 'optionalArrayOf' + _capitalize(k);

if (ndebug) {

out[name] = noop;

return;

}

var type = types[k];

var expected = '[' + k + ']';

out[name] = function (arg, msg) {

if (arg === undefined || arg === null) {

return;

}

if (!Array.isArray(arg)) {

_toss(msg, expected, type.operator, arg, type.actual);

}

var i;

for (i = 0; i < arg.length; i++) {

if (!type.check(arg[i])) {

_toss(msg, expected, type.operator, arg, type.actual);

}

}

};

});

/* re-export built-in assertions */

Object.keys(assert).forEach(function (k) {

if (k === 'AssertionError') {

out[k] = assert[k];

return;

}

if (ndebug) {

out[k] = noop;

return;

}

out[k] = assert[k];

});

/* export ourselves (for unit tests _only_) */

out._setExports = _setExports;

return out;

}

module.exports = _setExports(process.env.NODE_NDEBUG);