var deepEqual = require('deep-equal');
var defined = require('defined');
var path = require('path');
var inherits = require('inherits');
var EventEmitter = require('events').EventEmitter;
var has = require('has');
var trim = require('string.prototype.trim');
var bind = require('function-bind');
var forEach = require('for-each');
var isEnumerable = bind.call(Function.call, Object.prototype.propertyIsEnumerable);

module.exports = Test;

var nextTick = typeof setImmediate !== 'undefined'
    ? setImmediate
    : process.nextTick
;
var safeSetTimeout = setTimeout;

inherits(Test, EventEmitter);

var getTestArgs = function (name_, opts_, cb_) {
    var name = '(anonymous)';
    var opts = {};
    var cb;

    for (var i = 0; i < arguments.length; i++) {
        var arg = arguments[i];
        var t = typeof arg;
        if (t === 'string') {
            name = arg;
        } else if (t === 'object') {
            opts = arg || opts;
        } else if (t === 'function') {
            cb = arg;
        }
    }
    return { name: name, opts: opts, cb: cb };
};

function Test (name_, opts_, cb_) {
    if (! (this instanceof Test)) {
        return new Test(name_, opts_, cb_);
    }

    var args = getTestArgs(name_, opts_, cb_);

    this.readable = true;
    this.name = args.name || '(anonymous)';
    this.assertCount = 0;
    this.pendingCount = 0;
    this._skip = args.opts.skip || false;
    this._timeout = args.opts.timeout;
    this._objectPrintDepth = args.opts.objectPrintDepth || 5;
    this._plan = undefined;
    this._cb = args.cb;
    this._progeny = [];
    this._ok = true;

    for (var prop in this) {
        this[prop] = (function bind(self, val) {
            if (typeof val === 'function') {
                return function bound() {
                    return val.apply(self, arguments);
                };
            }
            return val;
        })(this, this[prop]);
    }
}

Test.prototype.run = function () {
    if (this._skip) {
        this.comment('SKIP ' + this.name);
    }
    if (!this._cb || this._skip) {
        return this._end();
    }
    if (this._timeout != null) {
        this.timeoutAfter(this._timeout);
    }
    this.emit('prerun');
    this._cb(this);
    this.emit('run');
};

Test.prototype.test = function (name, opts, cb) {
    var self = this;
    var t = new Test(name, opts, cb);
    this._progeny.push(t);
    this.pendingCount++;
    this.emit('test', t);
    t.on('prerun', function () {
        self.assertCount++;
    })
    
    if (!self._pendingAsserts()) {
        nextTick(function () {
            self._end();
        });
    }
    
    nextTick(function() {
        if (!self._plan && self.pendingCount == self._progeny.length) {
            self._end();
        }
    });
};

Test.prototype.comment = function (msg) {
    var that = this;
    forEach(trim(msg).split('\n'), function (aMsg) {
        that.emit('result', trim(aMsg).replace(/^#\s*/, ''));
    });
};

Test.prototype.plan = function (n) {
    this._plan = n;
    this.emit('plan', n);
};

Test.prototype.timeoutAfter = function(ms) {
    if (!ms) throw new Error('timeoutAfter requires a timespan');
    var self = this;
    var timeout = safeSetTimeout(function() {
        self.fail('test timed out after ' + ms + 'ms');
        self.end();
    }, ms);
    this.once('end', function() {
        clearTimeout(timeout);
    });
}

Test.prototype.end = function (err) { 
    var self = this;
    if (arguments.length >= 1 && !!err) {
        this.ifError(err);
    }
    
    if (this.calledEnd) {
        this.fail('.end() called twice');
    }
    this.calledEnd = true;
    this._end();
};

Test.prototype._end = function (err) {
    var self = this;
    if (this._progeny.length) {
        var t = this._progeny.shift();
        t.on('end', function () { self._end() });
        t.run();
        return;
    }
    
    if (!this.ended) this.emit('end');
    var pendingAsserts = this._pendingAsserts();
    if (!this._planError && this._plan !== undefined && pendingAsserts) {
        this._planError = true;
        this.fail('plan != count', {
            expected : this._plan,
            actual : this.assertCount
        });
    }
    this.ended = true;
};

Test.prototype._exit = function () {
    if (this._plan !== undefined &&
        !this._planError && this.assertCount !== this._plan) {
        this._planError = true;
        this.fail('plan != count', {
            expected : this._plan,
            actual : this.assertCount,
            exiting : true
        });
    } else if (!this.ended) {
        this.fail('test exited without ending', {
            exiting: true
        });
    }
};

Test.prototype._pendingAsserts = function () {
    if (this._plan === undefined) {
        return 1;
    }
    return this._plan - (this._progeny.length + this.assertCount);
};

Test.prototype._assert = function assert (ok, opts) {
    var self = this;
    var extra = opts.extra || {};
    
    var res = {
        id : self.assertCount ++,
        ok : Boolean(ok),
        skip : defined(extra.skip, opts.skip),
        name : defined(extra.message, opts.message, '(unnamed assert)'),
        operator : defined(extra.operator, opts.operator),
        objectPrintDepth : self._objectPrintDepth
    };
    if (has(opts, 'actual') || has(extra, 'actual')) {
        res.actual = defined(extra.actual, opts.actual);
    }
    if (has(opts, 'expected') || has(extra, 'expected')) {
        res.expected = defined(extra.expected, opts.expected);
    }
    this._ok = Boolean(this._ok && ok);
    
    if (!ok) {
        res.error = defined(extra.error, opts.error, new Error(res.name));
    }
    
    if (!ok) {
        var e = new Error('exception');
        var err = (e.stack || '').split('\n');
        var dir = path.dirname(__dirname) + path.sep;
        
        for (var i = 0; i < err.length; i++) {
            var m = /^[^\s]*\s*\bat\s+(.+)/.exec(err[i]);
            if (!m) {
                continue;
            }
            
            var s = m[1].split(/\s+/);
            var filem = /((?:\/|[A-Z]:\\)[^:\s]+:(\d+)(?::(\d+))?)/.exec(s[1]);
            if (!filem) {
                filem = /((?:\/|[A-Z]:\\)[^:\s]+:(\d+)(?::(\d+))?)/.exec(s[2]);
                
                if (!filem) {
                    filem = /((?:\/|[A-Z]:\\)[^:\s]+:(\d+)(?::(\d+))?)/.exec(s[3]);

                    if (!filem) {
                        continue;
                    }
                }
            }
            
            if (filem[1].slice(0, dir.length) === dir) {
                continue;
            }
            
            res.functionName = s[0];
            res.file = filem[1];
            res.line = Number(filem[2]);
            if (filem[3]) res.column = filem[3];
            
            res.at = m[1];
            break;
        }
    }

    self.emit('result', res);
    
    var pendingAsserts = self._pendingAsserts();
    if (!pendingAsserts) {
        if (extra.exiting) {
            self._end();
        } else {
            nextTick(function () {
                self._end();
            });
        }
    }
    
    if (!self._planError && pendingAsserts < 0) {
        self._planError = true;
        self.fail('plan != count', {
            expected : self._plan,
            actual : self._plan - pendingAsserts
        });
    }
};

Test.prototype.fail = function (msg, extra) {
    this._assert(false, {
        message : msg,
        operator : 'fail',
        extra : extra
    });
};

Test.prototype.pass = function (msg, extra) {
    this._assert(true, {
        message : msg,
        operator : 'pass',
        extra : extra
    });
};

Test.prototype.skip = function (msg, extra) {
    this._assert(true, {
        message : msg,
        operator : 'skip',
        skip : true,
        extra : extra
    });
};

Test.prototype.ok
= Test.prototype['true']
= Test.prototype.assert
= function (value, msg, extra) {
    this._assert(value, {
        message : defined(msg, 'should be truthy'),
        operator : 'ok',
        expected : true,
        actual : value,
        extra : extra
    });
};

Test.prototype.notOk
= Test.prototype['false']
= Test.prototype.notok
= function (value, msg, extra) {
    this._assert(!value, {
        message : defined(msg, 'should be falsy'),
        operator : 'notOk',
        expected : false,
        actual : value,
        extra : extra
    });
};

Test.prototype.error
= Test.prototype.ifError
= Test.prototype.ifErr
= Test.prototype.iferror
= function (err, msg, extra) {
    this._assert(!err, {
        message : defined(msg, String(err)),
        operator : 'error',
        actual : err,
        extra : extra
    });
};

Test.prototype.equal
= Test.prototype.equals
= Test.prototype.isEqual
= Test.prototype.is
= Test.prototype.strictEqual
= Test.prototype.strictEquals
= function (a, b, msg, extra) {
    this._assert(a === b, {
        message : defined(msg, 'should be equal'),
        operator : 'equal',
        actual : a,
        expected : b,
        extra : extra
    });
};

Test.prototype.notEqual
= Test.prototype.notEquals
= Test.prototype.notStrictEqual
= Test.prototype.notStrictEquals
= Test.prototype.isNotEqual
= Test.prototype.isNot
= Test.prototype.not
= Test.prototype.doesNotEqual
= Test.prototype.isInequal
= function (a, b, msg, extra) {
    this._assert(a !== b, {
        message : defined(msg, 'should not be equal'),
        operator : 'notEqual',
        actual : a,
        notExpected : b,
        extra : extra
    });
};

Test.prototype.deepEqual
= Test.prototype.deepEquals
= Test.prototype.isEquivalent
= Test.prototype.same
= function (a, b, msg, extra) {
    this._assert(deepEqual(a, b, { strict: true }), {
        message : defined(msg, 'should be equivalent'),
        operator : 'deepEqual',
        actual : a,
        expected : b,
        extra : extra
    });
};

Test.prototype.deepLooseEqual
= Test.prototype.looseEqual
= Test.prototype.looseEquals
= function (a, b, msg, extra) {
    this._assert(deepEqual(a, b), {
        message : defined(msg, 'should be equivalent'),
        operator : 'deepLooseEqual',
        actual : a,
        expected : b,
        extra : extra
    });
};

Test.prototype.notDeepEqual
= Test.prototype.notEquivalent
= Test.prototype.notDeeply
= Test.prototype.notSame
= Test.prototype.isNotDeepEqual
= Test.prototype.isNotDeeply
= Test.prototype.isNotEquivalent
= Test.prototype.isInequivalent
= function (a, b, msg, extra) {
    this._assert(!deepEqual(a, b, { strict: true }), {
        message : defined(msg, 'should not be equivalent'),
        operator : 'notDeepEqual',
        actual : a,
        notExpected : b,
        extra : extra
    });
};

Test.prototype.notDeepLooseEqual
= Test.prototype.notLooseEqual
= Test.prototype.notLooseEquals
= function (a, b, msg, extra) {
    this._assert(!deepEqual(a, b), {
        message : defined(msg, 'should be equivalent'),
        operator : 'notDeepLooseEqual',
        actual : a,
        expected : b,
        extra : extra
    });
};

Test.prototype['throws'] = function (fn, expected, msg, extra) {
    if (typeof expected === 'string') {
        msg = expected;
        expected = undefined;
    }

    var caught = undefined;

    try {
        fn();
    } catch (err) {
        caught = { error : err };
        if ((err != null) && (!isEnumerable(err, 'message') || !has(err, 'message'))) {
            var message = err.message;
            delete err.message;
            err.message = message;
        }
    }

    var passed = caught;

    if (expected instanceof RegExp) {
        passed = expected.test(caught && caught.error);
        expected = String(expected);
    }

    if (typeof expected === 'function' && caught) {
        passed = caught.error instanceof expected;
        caught.error = caught.error.constructor;
    }

    this._assert(typeof fn === 'function' && passed, {
        message : defined(msg, 'should throw'),
        operator : 'throws',
        actual : caught && caught.error,
        expected : expected,
        error: !passed && caught && caught.error,
        extra : extra
    });
};

Test.prototype.doesNotThrow = function (fn, expected, msg, extra) {
    if (typeof expected === 'string') {
        msg = expected;
        expected = undefined;
    }
    var caught = undefined;
    try {
        fn();
    }
    catch (err) {
        caught = { error : err };
    }
    this._assert(!caught, {
        message : defined(msg, 'should not throw'),
        operator : 'throws',
        actual : caught && caught.error,
        expected : expected,
        error : caught && caught.error,
        extra : extra
    });
};

Test.skip = function (name_, _opts, _cb) {
    var args = getTestArgs.apply(null, arguments);
    args.opts.skip = true;
    return Test(args.name, args.opts, args.cb);
};

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