internal static string CombineResourceId()

in src/PSRule.Rules.Azure/Common/ResourceHelper.cs [177:230]
48 lines of code
14 McCabe index (conditional complexity)

    internal static string CombineResourceId(string subscriptionId, string resourceGroup, string[] resourceType, string[] name, int depth = int.MaxValue)
    {
        var resourceTypeLength = resourceType?.Length ?? 0;
        var nameLength = name?.Length ?? 0;
        if (resourceTypeLength != nameLength)
            throw new TemplateFunctionException(nameof(resourceType), FunctionErrorType.MismatchingResourceSegments, PSRuleResources.MismatchingResourceSegments);

        var parts = resourceTypeLength + nameLength;
        parts += subscriptionId != null ? 2 : 0;
        parts += resourceGroup != null ? 2 : 0;

        for (var p = 0; resourceType != null && p < resourceType.Length; p++)
        {
            if (resourceType[p].Contains(DOT))
                parts++;
        }

        var result = new string[parts * 2];
        var i = 0;
        var j = 0;

        if (subscriptionId != null)
        {
            result[i++] = SLASH;
            result[i++] = SUBSCRIPTIONS;
            result[i++] = SLASH;
            result[i++] = subscriptionId;
        }
        if (resourceGroup != null)
        {
            result[i++] = SLASH;
            result[i++] = RESOURCE_GROUPS;
            result[i++] = SLASH;
            result[i++] = resourceGroup;
        }
        if (resourceTypeLength > 0 && depth >= 0)
        {
            while (i < result.Length && j <= depth)
            {
                // If a resource provider is included prepend /providers.
                if (resourceType[j].Contains(DOT))
                {
                    result[i++] = SLASH;
                    result[i++] = PROVIDERS;
                }

                result[i++] = SLASH;
                result[i++] = resourceType[j];
                result[i++] = SLASH;
                result[i++] = name[j++];
            }
        }
        return string.Concat(result);
    }