module "default_tags" {
  source             = "git@github.com:theorchard/terraform-default-tags.git//?ref=2.0.0"
  environment        = var.environment
  application_family = var.application_family
  service_name       = var.service_name
  team_name          = var.team_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/lambda-spotify-daily-chart-freshness/terraform.tfstate"
    region  = "us-east-1"
    encrypt = "true"
  }
}

data "aws_caller_identity" "current" {}

module "vpc_info" {
  source = "git@github.com:theorchard/terraform-vpc-info.git//?ref=3.2.3"

  environment = var.environment
}

# ── Secrets ────────────────────────────────────────────────────────────────────

module "secrets" {
  source   = "git@github.com:theorchard/terraform-secrets-manager.git//?ref=1.5.1"
  for_each = toset(var.secret_names)

  environment        = var.environment
  application_family = var.application_family
  service_name       = var.service_name
  secret_name        = each.value
}

# ── Lambda function ────────────────────────────────────────────────────────────

module "lambda_spotify_daily_chart_freshness" {
  source = "git@github.com:theorchard/terraform-lambda.git//?ref=5.3.0"

  environment        = var.environment
  application_family = var.application_family
  lambda_name        = var.lambda_name
  lambda_description = "Polls Spotify chart availability and alerts when FACT_CHARTS lags by more than ${var.lag_alert_minutes} minutes."

  use_container_image = true
  vpc_enabled         = true
  vpc_id              = module.vpc_info.vpc_id
  vpc_subnet_ids      = module.vpc_info.default_private_subnet_ids

  cloudwatch_event_enabled  = true
  cloudwatch_event_schedule = "rate(5 minutes)"

  datadog_enabled          = true
  datadog_advanced_enabled = true

  lambda_function_timeout = var.lambda_timeout

  lambda_function_environment_variables = {
    ENVIRONMENT            = var.environment
    SPOTIFY_SECRETS_PATH   = "${var.environment}/${var.service_name}"
    SNOWFLAKE_SECRETS_PATH = "${var.environment}/${var.service_name}"
    SSM_STATE_PARAM        = "/${var.environment}/${var.service_name}/state"
    LAG_ALERT_MINUTES      = tostring(var.lag_alert_minutes)
    SNOWFLAKE_ACCOUNT      = var.snowflake_account
    SNOWFLAKE_USER         = var.snowflake_user
  }

  iam_managed_policy_attachments = [
    aws_iam_policy.ssm_state_rw.arn,
    aws_iam_policy.secrets_manager_ro.arn,
  ]
}

module "datadog_lambda_spotify_daily_chart_freshness" {
  source = "git@github.com:theorchard/terraform-datadog.git//modules/lambda?ref=6.19.0"

  environment                       = var.environment
  service_name                      = var.lambda_name
  notification_endpoints            = var.notification_endpoint
  escalation_notification_endpoints = var.notification_endpoint
}

# ── IAM ────────────────────────────────────────────────────────────────────────

data "aws_iam_policy_document" "ssm_state_rw" {
  statement {
    actions = [
      "ssm:GetParameter",
      "ssm:PutParameter",
    ]
    resources = [
      "arn:aws:ssm:${var.aws_region}:${data.aws_caller_identity.current.account_id}:parameter/${var.environment}/${var.service_name}/*",
    ]
  }
}

resource "aws_iam_policy" "ssm_state_rw" {
  name        = "SSM-${var.environment}-${var.service_name}-RW"
  description = "Read/write SSM state parameter for ${var.lambda_name}"
  policy      = data.aws_iam_policy_document.ssm_state_rw.json
}

data "aws_iam_policy_document" "secrets_manager_ro" {
  statement {
    actions = [
      "secretsmanager:GetSecretValue",
    ]
    resources = [
      "arn:aws:secretsmanager:${var.aws_region}:${data.aws_caller_identity.current.account_id}:secret:${var.environment}/${var.service_name}/*",
    ]
  }
}

resource "aws_iam_policy" "secrets_manager_ro" {
  name        = "SecretsManager-${var.environment}-${var.service_name}-RO"
  description = "Read Spotify and Snowflake credentials for ${var.lambda_name}"
  policy      = data.aws_iam_policy_document.secrets_manager_ro.json
}