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# Lambda layers ==============================================================

resource "aws_lambda_layer_version" "this" {
  for_each = var.layers

  layer_name               = each.value.name
  description              = each.value.description
  filename                 = each.value.filename
  s3_bucket                = each.value.s3_bucket
  s3_key                   = each.value.s3_key
  compatible_runtimes      = each.value.compatible_runtimes
  compatible_architectures = each.value.compatible_architectures
}

# Lambda functions ===========================================================

resource "aws_lambda_function" "this" {
  for_each = var.functions

  function_name                  = each.value.name
  description                    = each.value.description
  runtime                        = each.value.image_uri == null ? each.value.runtime : null
  handler                        = each.value.image_uri == null ? each.value.handler : null
  role                           = each.value.role_arn
  filename                       = each.value.filename
  s3_bucket                      = each.value.s3_bucket
  s3_key                         = each.value.s3_key
  s3_object_version              = each.value.s3_object_version
  image_uri                      = each.value.image_uri
  architectures                  = each.value.architectures
  memory_size                    = each.value.memory_size
  timeout                        = each.value.timeout
  reserved_concurrent_executions = each.value.reserved_concurrent_executions
  publish                        = each.value.publish
  kms_key_arn                    = each.value.kms_key_arn
  layers                         = each.value.layers

  dynamic "environment" {
    for_each = length(each.value.environment) > 0 ? [each.value.environment] : []
    content {
      variables = environment.value
    }
  }

  dynamic "vpc_config" {
    for_each = length(each.value.subnet_ids) > 0 ? [true] : []
    content {
      subnet_ids         = each.value.subnet_ids
      security_group_ids = each.value.security_group_ids
    }
  }

  tracing_config {
    mode = each.value.tracing_mode
  }

  tags = local.tags
}

# Event source mappings ======================================================

resource "aws_lambda_event_source_mapping" "this" {
  for_each = local.event_source_map

  function_name                  = aws_lambda_function.this[each.value.fn_key].arn
  event_source_arn               = each.value.es.event_source_arn
  batch_size                     = each.value.es.batch_size
  starting_position              = each.value.es.starting_position
  bisect_batch_on_function_error = each.value.es.bisect_on_function_error

  function_response_types = length(each.value.es.function_response_types) > 0 ? each.value.es.function_response_types : null
}