data "aws_iam_policy_document" "ecs_task_assume" {
  statement {
    actions = ["sts:AssumeRole"]
    principals {
      type        = "Service"
      identifiers = ["ecs-tasks.amazonaws.com"]
    }
  }
}

resource "aws_iam_role" "task_execution" {
  name               = "${local.name_prefix}-task-execution"
  assume_role_policy = data.aws_iam_policy_document.ecs_task_assume.json
}

resource "aws_iam_role_policy_attachment" "task_execution_basic" {
  role       = aws_iam_role.task_execution.name
  policy_arn = "arn:aws:iam::aws:policy/service-role/AmazonECSTaskExecutionRolePolicy"
}

data "aws_iam_policy_document" "task_execution_secrets" {
  statement {
    actions = ["secretsmanager:GetSecretValue"]
    resources = [
      aws_secretsmanager_secret.database_url.arn,
      aws_secretsmanager_secret.token_signing.arn,
    ]
  }
}

resource "aws_iam_role_policy" "task_execution_secrets" {
  name   = "${local.name_prefix}-task-execution-secrets"
  role   = aws_iam_role.task_execution.id
  policy = data.aws_iam_policy_document.task_execution_secrets.json
}

# Task role: scoped to the service's runtime needs. Plane needs S3 rw on the
# payloads bucket; control plane currently needs nothing beyond logs.
resource "aws_iam_role" "control_task" {
  name               = "${local.name_prefix}-control-task"
  assume_role_policy = data.aws_iam_policy_document.ecs_task_assume.json
}

resource "aws_iam_role" "plane_task" {
  name               = "${local.name_prefix}-plane-task"
  assume_role_policy = data.aws_iam_policy_document.ecs_task_assume.json
}

data "aws_iam_policy_document" "plane_s3" {
  statement {
    actions = [
      "s3:GetObject",
      "s3:PutObject",
      "s3:DeleteObject",
      "s3:ListBucket",
    ]
    resources = [
      aws_s3_bucket.payloads.arn,
      "${aws_s3_bucket.payloads.arn}/*",
    ]
  }
}

resource "aws_iam_role_policy" "plane_s3" {
  name   = "${local.name_prefix}-plane-s3"
  role   = aws_iam_role.plane_task.id
  policy = data.aws_iam_policy_document.plane_s3.json
}