# ---------------------------------------------------------------------------------------------------------------------
# LOAD BALANCER FOR PORTAL
# ---------------------------------------------------------------------------------------------------------------------
resource "aws_alb" "portal" {
  name            = "portal-alb-${var.environment}"
  security_groups = [ aws_security_group.customer_portal_alb.id, ]
  internal        = false 
  subnets         = var.public_subnets

  tags = merge( var.standard_tags, var.tags, { Name = "portal-alb-${var.environment}" })

  access_logs {
    bucket = "xdr-elb-${ var.environment }"
    prefix = ""
    enabled = true
  }
}

# Create a new target group
resource "aws_alb_target_group" "portal" {
  name                 = "portal-alb-targets-${var.environment}"
  port                 = 443 
  protocol             = "HTTPS"
  vpc_id               = var.vpc_id

  health_check {
    protocol = "HTTPS"
    path    = "/api/health/"
    matcher = "200-400"
  }

  stickiness {
    type    = "lb_cookie"
    enabled = false 
  }

  tags = merge( var.standard_tags, var.tags, )
}

# Create a new alb listener ( certificate_arn wait for DNS cut over )
resource "aws_alb_listener" "portal_https" {
  load_balancer_arn = aws_alb.portal.arn
  port              = "443"
  protocol          = "HTTPS"
  ssl_policy        = "ELBSecurityPolicy-TLS-1-2-2017-01"
  certificate_arn   = aws_acm_certificate.cert.arn

  default_action {
    target_group_arn = aws_alb_target_group.portal.arn
    type             = "forward"
  }
}

# HTTPs Redirect
resource "aws_lb_listener" "portal_https_redirect" {
  load_balancer_arn = aws_alb.portal.arn
  port              = "80"
  protocol          = "HTTP"

  default_action {
    type = "redirect"

    redirect {
      port        = "443"
      protocol    = "HTTPS"
      status_code = "HTTP_301"
    }
  }
}

# Attach the instances to the ELB
resource "aws_autoscaling_attachment" "customer_portal_asg_attachment" {
  alb_target_group_arn = aws_alb_target_group.portal.arn
  autoscaling_group_name = aws_autoscaling_group.customer_portal.name
}

#----------
# DNS Entry
#----------
module "public_dns_record" {
  source = "../../submodules/dns/public_ALIAS_record"

  name = "portal"
  target_dns_name = aws_alb.portal.dns_name
  target_zone_id  = aws_alb.portal.zone_id
  dns_info = var.dns_info

  providers = {
    aws.mdr-common-services-commercial = aws.mdr-common-services-commercial
  }
}

#------------------------------------
# Security Group
#------------------------------------

resource "aws_security_group" "customer_portal_alb" {
  name        = "customer_portal_alb_inbound_sg"
  description = "Allow Customer Portal ALB HTTP Traffic Inbound"
  vpc_id      = var.vpc_id
}

resource "aws_security_group_rule" "customer_portal_alb_https" {
  protocol          = "tcp"
  type              = "ingress"
  from_port         = 443
  to_port           = 443
  security_group_id = aws_security_group.customer_portal_alb.id
  cidr_blocks       = [ var.environment == "test" ? "10.0.0.0/8" : "0.0.0.0/0",  ]
}

#Allow viewing of test portal from home. We don't want world to view test portal.
resource "aws_security_group_rule" "customer_portal_alb_https_test" {
  protocol          = "tcp"
  type              = "ingress"
  from_port         = 443
  to_port           = 443
  security_group_id = aws_security_group.customer_portal_alb.id
  cidr_blocks       = flatten(var.portal_test_whitelist)
}

## Needed for HTTPs redirect
resource "aws_security_group_rule" "customer_portal_alb_http" {
  protocol          = "tcp"
  type              = "ingress"
  from_port         = 80
  to_port           = 80
  security_group_id = aws_security_group.customer_portal_alb.id
  cidr_blocks       = [ var.environment == "test" ? "10.0.0.0/8" : "0.0.0.0/0", ]
}

resource "aws_security_group_rule" "customer_portal_alb" {
  protocol                 = "tcp"
  type                     = "egress"
  from_port                = 443
  to_port                  = 443
  security_group_id        = aws_security_group.customer_portal_alb.id
  source_security_group_id = aws_security_group.customer_portal.id
}