# ---------------------------
# ALB
# ---------------------------
# ALBの作成
resource "aws_lb" "alb" {
  name               = "${var.name_prefix}${var.env}-${var.alb_name}"
  internal           = false
  load_balancer_type = "application"
  security_groups    = [var.alb_sg_id]
  subnets = [
    var.aws_subnet_public_1a_id,
    var.aws_subnet_public_1c_id
  ]
  ip_address_type = "ipv4"
  tags = {
    Name = "${var.name_prefix}${var.env}-${var.alb_name}"
  }
}

# ターゲットグループの作成
resource "aws_lb_target_group" "target_group" {
  name             = "${var.name_prefix}${var.env}-${var.target_group_name}"
  target_type      = "instance"
  protocol_version = "HTTP1"
  port             = 80
  protocol         = "HTTP"
  vpc_id           = var.vpc_id
  # ヘルスチェックの設定
  health_check {
    interval            = 30
    path                = "/wp-includes/images/blank.gif"
    port                = "traffic-port"
    protocol            = "HTTP"
    timeout             = 5
    healthy_threshold   = 5
    unhealthy_threshold = 2
    matcher             = "200,301"
  }
  # スティッキーセッションの設定
  stickiness {
    type            = "lb_cookie"
    cookie_duration = 1800
    enabled         = true
  }
  tags = {
    Name = "${var.name_prefix}${var.env}-${var.target_group_name}"
  }
}

# ターゲットグループとインスタンスの紐づけ
resource "aws_lb_target_group_attachment" "attach_ec2_web1" {
  target_group_arn = aws_lb_target_group.target_group.arn
  target_id        = var.ec2_web1_id
}

resource "aws_lb_target_group_attachment" "attach_ec2_web2" {
  target_group_arn = aws_lb_target_group.target_group.arn
  target_id        = var.ec2_web2_id
}

# リスナーの設定
resource "aws_lb_listener" "listener" {
  load_balancer_arn = aws_lb.alb.arn
  port              = 80
  protocol          = "HTTP"
  default_action {
    type             = "forward"
    target_group_arn = aws_lb_target_group.target_group.arn
  }
}