module "default_tags" {
  source             = "git@github.com:theorchard/terraform-default-tags.git//?ref=1.0.0"
  environment        = var.environment
  application_family = var.application_family
  service_name       = var.service_name
}

provider "aws" {
  region = var.aws_region

  default_tags {
    tags = module.default_tags.tags
  }
}

# Terraform backends cannot contain interpolations
terraform {
  backend "s3" {
    bucket  = "orcd-terraform-state"
    key     = "prod/reserved-instances/terraform.tfstate"
    region  = "us-east-1"
    encrypt = "true"
  }
}

data "aws_rds_reserved_instance_offering" "db_t4g_medium_reserved_instance_offering" {
  db_instance_class   = "db.t4g.medium"
  duration            = 1
  offering_type       = "No Upfront"
  product_description = "aurora-mysql"
  multi_az            = false
}

data "aws_rds_reserved_instance_offering" "db_r6g_large_reserved_instance_offering" {
  db_instance_class   = "db.r6g.large"
  duration            = 1
  offering_type       = "No Upfront"
  product_description = "aurora-mysql"
  multi_az            = false
}

data "aws_rds_reserved_instance_offering" "db_r7g_large_reserved_instance_offering" {
  db_instance_class   = "db.r7g.large"
  duration            = 1
  offering_type       = "No Upfront"
  product_description = "aurora-mysql"
  multi_az            = false
}

# Reserved RDS Instance 30 x db.t4g.medium
# 1-year No Upfront commitment for cost optimization
resource "aws_rds_reserved_instance" "rds_t4g_medium_reserved_instance" {
  offering_id    = data.aws_rds_reserved_instance_offering.db_t4g_medium_reserved_instance_offering.offering_id
  reservation_id = "aurora-mysql-t4g-medium-2025-10-08"
  instance_count = 30
}

# Reserved RDS Instance 11 x db.r6g.large, 2 x db.r6g.2xlarge = 19 total
# 1-year No Upfront commitment for cost optimization
resource "aws_rds_reserved_instance" "rds_r6g_large_reserved_instance" {
  offering_id    = data.aws_rds_reserved_instance_offering.db_r6g_large_reserved_instance_offering.offering_id
  reservation_id = "aurora-mysql-r6g-large-2025-10-08"
  instance_count = 19
}

# Reserved RDS Instance 8 x db.r7g.large
# 1-year No Upfront commitment for cost optimization
resource "aws_rds_reserved_instance" "rds_r7g_large_reserved_instance" {
  offering_id    = data.aws_rds_reserved_instance_offering.db_r7g_large_reserved_instance_offering.offering_id
  reservation_id = "aurora-mysql-r7g-large-2025-10-29"
  instance_count = 8
}