public SourceToTargetEnvironmentMap(EnvironmentResource[] environmentsToMigrate, EnvironmentResource[] existingEnvironments)
{
var expectedTargetEnvironmentNames =
environmentsToMigrate.Select(Conventions.BuildTargetEnvironmentNameFromSourceEnvironment)
.Distinct()
.OrderBy(name => name)
.ToArray();
var targetEnvironments = existingEnvironments.Where(
e => expectedTargetEnvironmentNames.Contains(e.Name, StringComparer.OrdinalIgnoreCase))
.ToArray();
MissingTargetEnvironmentNames =
expectedTargetEnvironmentNames.Except(targetEnvironments.Select(e => e.Name)).ToArray();
if (!MissingTargetEnvironmentNames.Any())
{
sourcesAndTargets = environmentsToMigrate
.Select(source => new SourceAndTargetEnvironment(source, targetEnvironments.FirstOrDefault(target => string.Equals(target.Name, Conventions.BuildTargetEnvironmentNameFromSourceEnvironment(source), StringComparison.OrdinalIgnoreCase))))
.ToArray();
}
}