var app = angular.module('app');

//filter items by associated tags
app.filter('tagfilter', function () {
    return function (items, tagText) {
        if (!items || items === undefined)
            return null;
        if (!tagText)
            return items;
        var filtered = [];
     
        if (tagText === 'absolutely no tags whatsoever' && items !== undefined) {         
            for (var i = 0; i < items.length; i++) {
                var item = items[i];
                if (item.tags) {
                    if (item.tags.length === 0)
                        filtered.push(item);
                }
            }
        } else {
            for (var i = 0; i < items.length; i++) {
                var item = items[i];
                if (item.tags) {
                   for (var j = 0; j < item.tags.length; j++) {
                        var text = item.tags[j].text;
                        if (text === tagText) 
                            filtered.push(item);
                    } 
                }
            }
        }
        
        return filtered;
    };
});

//filter items by associated tags
app.filter('issuerfilter', function () {
    return function (issuers, text) {
        if (!issuers || issuers === undefined)
            return null;
        if (!text)
            return issuers;
        var filtered = [];

        for (var i = 0; i < issuers.length; i++) {
            if (issuers[i].issuer) {
                var issuer = issuers[i].issuer;
                if (issuer.name == text) {
                    filtered.push(issuers[i]);
                }
            }
           
        }
        return filtered;
    };
});

//filter items by associated roles
app.filter('roleFilter', function () {
    return function (users, role, org) {
        if (!users || users === undefined)
            return null;
        if (!role)
            return users;

        var filtered = [];

        for (var i = 0; i < users.length; i++) {
            var returnUser = false;
            if (users[i].roleAllocations) {
                for (var j = 0; j < users[i].roleAllocations.length; j++) {
                    if (org) {
                        if (users[i].roleAllocations[j].roleDisplayName == role && users[i].roleAllocations[j].organisationId == org) {
                            returnUser = true;
                        }
                    } else {
                        if (users[i].roleAllocations[j].roleDisplayName == role) {
                            returnUser = true;
                        }
                    }
                }
            }
            if (returnUser)
                 filtered.push(users[i]);
        }
        return filtered;
    };
});

app.filter('unique', function () {

    return function (items, filterOn) {

        if (filterOn === false) {
            return items;
        }

        if ((filterOn || angular.isUndefined(filterOn)) && angular.isArray(items)) {
            var hashCheck = {}, newItems = [];

            var extractValueToCompare = function (item) {
                if (angular.isObject(item) && angular.isString(filterOn)) {
                    return item[filterOn];
                } else {
                    return item;
                }
            };

            angular.forEach(items, function (item) {
                var valueToCheck, isDuplicate = false;

                for (var i = 0; i < newItems.length; i++) {
                    if (angular.equals(extractValueToCompare(newItems[i]), extractValueToCompare(item))) {
                        isDuplicate = true;
                        break;
                    }
                }
                if (!isDuplicate) {
                    newItems.push(item);
                }

            });
            items = newItems;
        }
        return items;
    };
});

//filter items by searching the item for the 'search' text
app.filter('itemtextfilter', function (search) {
    return function (items, searchText) {
        if (!items)
            return null;
        if (!searchText)
            return items;
        var filtered = [];
   
        //we are using lunr full text searching to implement this filter
        var results = search.searchItem(searchText);
        var matchedIds = $.map(results, function(obj) {
            return obj.ref;
        });
        for (var i = 0; i < items.length; i++) {
            if(matchedIds.indexOf(items[i].itemId)>-1)
                filtered.push(items[i]);
        }
        return filtered;
    };
});

//filter items by associated competency
app.filter('competencyfilter', function () {
    return function (items, competencyId) {
        if (!items)
            return null;
        if (!competencyId)
            return items;
        var filtered = [];

        for (var i = 0; i < items.length; i++) {
            var item = items[i];
            if (item.competencies) {
                for (var j = 0; j < item.competencies.length; j++) {
                    if (competencyId === item.competencies[j]) 
                        filtered.push(item);
                }
            }
        }
        return filtered;
    };
});

app.filter('numberFixedLength', function () {
    return function (n, len) {
        var num = parseInt(n, 10);
        len = parseInt(len, 10);
        if (isNaN(num) || isNaN(len)) {
            return n;
        }
        num = '' + num;
        while (num.length < len) {
            num = '0' + num;
        }
        return num;
    };
});

app.filter('trimStart', function () {
    return function (n, len) {
        var num = parseInt(n, 10);
        len = parseInt(len, 10);
        if (isNaN(num) || isNaN(len)) {
            return n;
        }
        num = '' + num;
        num = num.slice(len);
        return num;
    };
});

app.filter('capitalizeFirst', function () {
    return function (s) { return (angular.isString(s) && s.length > 0) ? s[0].toUpperCase() + s.substr(1).toLowerCase() : s; }
});

app.filter('UTCDate', function () {
    return function (utcDateString, format) {
        // return if input date is null or undefined
        if (!utcDateString) {
            return;
        }

        // append 'Z' to the date string to indicate UTC time if the timezone isn't already specified
        if (utcDateString.indexOf('Z') === -1 && utcDateString.indexOf('+') === -1) {
            utcDateString += 'Z';
        }

        // convert and format date using the built in angularjs date filter
        return utcDateString;
    };
});

app.filter('usersSelectedGroupFilter', function () {
    return function (users, selectedOrg) {
        if (!selectedOrg) return users;
        var filterOrgIds = [selectedOrg];

        return users.filter(function (user) {
            var match = false;
            if (user.groups) {
                user.groups
                    .map(function (org) { return org.id })
                    .forEach(function (id) {
                        if (filterOrgIds.indexOf(id) > -1) match = true;

                    });
                return match;
            }

        });
    }
});

app.filter('filesize', function () {
    return function (size) {
        if (isNaN(size))
            size = 0;

        if (size < 1024)
            return size + ' Bytes';

        size /= 1024;

        if (size < 1024)
            return size.toFixed(2) + ' Kb';

        size /= 1024;

        if (size < 1024)
            return size.toFixed(2) + ' Mb';

        size /= 1024;

        if (size < 1024)
            return size.toFixed(2) + ' Gb';

        size /= 1024;

        return size.toFixed(2) + ' Tb';
    };
});

app.filter('dateRange', function () {
    return function (items, startDate, endDate, name) {

        var retArray = [];

        if (!startDate && !endDate) {
            return items;
        }
        angular.forEach(items, function (obj) {
            var receivedDate = name ? obj[name] : obj.date;
            if (moment(receivedDate).isAfter(startDate) && moment(receivedDate).isBefore(endDate)) {
                retArray.push(obj);
            }
        });

        return retArray;

    };
})