#로드밸런서
resource "aws_lb" "alb" {
    name = "${var.name}-alb" 
    load_balancer_type = "application"
    subnets = var.subnet_ids
    security_groups = var.sg_ids
}
# ALB LISTENER
resource "aws_lb_listener" "http" {
    load_balancer_arn = aws_lb.alb.arn
    port = "80"
    protocol = "HTTP"

    default_action {
        type             = "forward"
        target_group_arn = aws_lb_target_group.instance.arn
    }
}
# ALB Listener rule
resource "aws_lb_listener_rule" "alb-lsn-rule" {
  listener_arn = aws_lb_listener.http.arn
  priority     = 100

  condition {
    path_pattern {
      values = ["*"]
    }
    # field = "path-pattern"
    # values = ["*"]
  }

  action {
    type             = "forward"
    target_group_arn = aws_lb_target_group.instance.arn
  }
  depends_on = [
    aws_lb_listener.http
  ]
}

# https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lb_target_group
# ALB TARGET GROUP
resource "aws_lb_target_group" "instance" {
  name     = "web-tg"
  port     = 80
  protocol = "HTTP"
  vpc_id   = var.vpc_id
}

# https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lb_target_group_attachment
resource "aws_lb_target_group_attachment" "instance" {
  target_group_arn = aws_lb_target_group.instance.arn
  target_id        = var.instance_id
  port             = 80
}