# ===============================================================================================================
# data-sources.tf - Fuentes de datos para detectar recursos existentes
# Descripción:
#       Evita la creación duplicada de recursos verificando su existencia en AWS
#       antes de intentar crear nuevos recursos.
# ===============================================================================================================

# -------------------------------------------------------------------------------
# Verificación de EC2 existente
# -------------------------------------------------------------------------------
data "aws_instances" "existing_api" {
  filter {
    name   = "tag:Name"
    values = ["${var.project_name}-api-${var.environment}"]
  }

  filter {
    name   = "instance-state-name"
    values = ["running", "stopped", "stopping"]
  }
}

# -------------------------------------------------------------------------------
# Verificación de RDS existente
# -------------------------------------------------------------------------------
data "aws_db_instance" "existing" {
  count = var.db_identifier != "" ? 1 : 0

  db_instance_identifier = var.db_identifier
}

# -------------------------------------------------------------------------------
# Verificación de NAT Gateway existente en la VPC
# -------------------------------------------------------------------------------
data "aws_nat_gateways" "existing" {
  filter {
    name   = "vpc-id"
    values = [aws_vpc.main.id]
  }

  filter {
    name   = "state"
    values = ["available"]
  }
}

# -------------------------------------------------------------------------------
# Verificación de CloudFront distribution existente
# -------------------------------------------------------------------------------
data "aws_cloudfront_distribution" "existing" {
  count = var.cloudfront_distribution_id != "" ? 1 : 0
  id    = var.cloudfront_distribution_id
}