describe('edx.utils.validate', function () {
    'use strict';

    var fixture = null,
        field = null,
        result = null,
        MIN_LENGTH = 2,
        MAX_LENGTH = 20,
        VALID_STRING = 'xsy_is_awesome',
        SHORT_STRING = 'x',
        LONG_STRING = 'xsy_is_way_too_awesome',
        REQUIRED_ERROR_FRAGMENT = 'required',
        MIN_ERROR_FRAGMENT = 'least',
        MAX_ERROR_FRAGMENT = 'up to',
        CUSTOM_MESSAGE = 'custom message';

    var createFixture = function( type, name, required, minlength, maxlength, value ) {
        setFixtures('<input id="field" type=' + type + '>');

        field = $('#field');
        field.prop('required', required);
        field.attr({
            name: name,
            minlength: minlength,
            maxlength: maxlength,
            value: value
        });
    };

    var expectValid = function() {
        result = edx.utils.validate(field);
        expect(result.isValid).toBe(true);
    };

    var expectInvalid = function( errorFragment ) {
        result = edx.utils.validate(field);
        expect(result.isValid).toBe(false);
        expect(result.message).toMatch(errorFragment);
    };

    it('succeeds if an optional field is left blank', function () {
        createFixture('text', 'username', false, MIN_LENGTH, MAX_LENGTH, '');
        expectValid();
    });

    it('succeeds if a required field is provided a valid value', function () {
        createFixture('text', 'username', true, MIN_LENGTH, MAX_LENGTH, VALID_STRING);
        expectValid();
    });

    it('fails if a required field is left blank', function () {
        createFixture('text', 'username', true, MIN_LENGTH, MAX_LENGTH, '');
        expectInvalid(REQUIRED_ERROR_FRAGMENT);
    });
    
    it('fails if a field is provided a value below its minimum character limit', function () {
        createFixture('text', 'username', false, MIN_LENGTH, MAX_LENGTH, SHORT_STRING);
        
        // Verify optional field behavior
        expectInvalid(MIN_ERROR_FRAGMENT);

        // Verify required field behavior
        field.prop('required', true);
        expectInvalid(MIN_ERROR_FRAGMENT);
    });

    it('succeeds if a field with no minimum character limit is provided a value below its maximum character limit', function () {
        createFixture('text', 'username', false, null, MAX_LENGTH, SHORT_STRING);
        
        // Verify optional field behavior
        expectValid();

        // Verify required field behavior
        field.prop('required', true);
        expectValid();
    });

    it('fails if a required field with no minimum character limit is left blank', function () {
        createFixture('text', 'username', true, null, MAX_LENGTH, '');
        expectInvalid(REQUIRED_ERROR_FRAGMENT);
    });

    it('fails if a field is provided a value above its maximum character limit', function () {
        createFixture('text', 'username', false, MIN_LENGTH, MAX_LENGTH, LONG_STRING);

        // Verify optional field behavior
        expectInvalid(MAX_ERROR_FRAGMENT);

        // Verify required field behavior
        field.prop('required', true);
        expectInvalid(MAX_ERROR_FRAGMENT);
    });

    it('succeeds if a field with no maximum character limit is provided a value above its minimum character limit', function () {
        createFixture('text', 'username', false, MIN_LENGTH, null, LONG_STRING);

        // Verify optional field behavior
        expectValid();

        // Verify required field behavior
        field.prop('required', true);
        expectValid();
    });

    it('succeeds if a field with no character limits is provided a value', function () {
        createFixture('text', 'username', false, null, null, VALID_STRING);

        // Verify optional field behavior
        expectValid();

        // Verify required field behavior
        field.prop('required', true);
        expectValid();
    });

    it('fails if an email field is provided an invalid address', function () {
        createFixture('email', 'email', false, MIN_LENGTH, MAX_LENGTH, 'localpart');

        // Verify optional field behavior
        expectInvalid('invalid');

        // Verify required field behavior
        field.prop('required', false);
        expectInvalid('invalid');
    });

    it('succeeds if an email field is provided a valid address', function () {
        createFixture('email', 'email', false, MIN_LENGTH, MAX_LENGTH, 'localpart@label.tld');

        // Verify optional field behavior
        expectValid();

        // Verify required field behavior
        field.prop('required', true);
        expectValid();
    });

    it('succeeds if a checkbox is optional, or required and checked, but fails if a required checkbox is unchecked', function () {
        createFixture('checkbox', 'checkbox', false, null, null, 'value');

        // Optional, unchecked
        expectValid();

        // Optional, checked
        field.prop('checked', true);
        expectValid();

        // Required, checked
        field.prop('required', true);
        expectValid();

        // Required, unchecked
        field.prop('checked', false);
        expectInvalid(REQUIRED_ERROR_FRAGMENT);
    });

    it('returns a custom error message if an invalid field has one attached', function () {
        // Create a blank required field
        createFixture('text', 'username', true, MIN_LENGTH, MAX_LENGTH, '');

        // Attach a custom error message to the field
        field.data('errormsg-required', CUSTOM_MESSAGE);

        expectInvalid(CUSTOM_MESSAGE);
    });
});