# Lambda artifacts bucket. Terraform ships only the bootstrap stub.
# .github/workflows/deploy.yaml uploads functions/<name>/<sha>.zip and calls
# update-function-code. Functions ignore code attributes afterwards.

resource "aws_s3_bucket" "artifacts" {
  bucket = local.artifacts_bucket_name

  tags = {
    Purpose = "Lambda deployment packages for afterhours-shift-manager"
  }
}

resource "aws_s3_bucket_public_access_block" "artifacts" {
  bucket = aws_s3_bucket.artifacts.id

  block_public_acls       = true
  block_public_policy     = true
  ignore_public_acls      = true
  restrict_public_buckets = true
}

resource "aws_s3_bucket_ownership_controls" "artifacts" {
  bucket = aws_s3_bucket.artifacts.id

  rule {
    object_ownership = "BucketOwnerEnforced"
  }
}

resource "aws_s3_bucket_server_side_encryption_configuration" "artifacts" {
  bucket = aws_s3_bucket.artifacts.id

  rule {
    apply_server_side_encryption_by_default {
      sse_algorithm = "AES256"
    }
  }
}

resource "aws_s3_bucket_versioning" "artifacts" {
  bucket = aws_s3_bucket.artifacts.id

  versioning_configuration {
    status = "Enabled"
  }
}

resource "aws_s3_bucket_lifecycle_configuration" "artifacts" {
  bucket = aws_s3_bucket.artifacts.id

  rule {
    id     = "expire-noncurrent-packages"
    status = "Enabled"

    filter {}

    noncurrent_version_expiration {
      noncurrent_days = 180
    }
  }

  rule {
    id     = "abort-incomplete-multipart"
    status = "Enabled"

    filter {}

    abort_incomplete_multipart_upload {
      days_after_initiation = 7
    }
  }

  depends_on = [aws_s3_bucket_versioning.artifacts]
}

data "aws_iam_policy_document" "artifacts" {
  statement {
    sid    = "DenyInsecureTransport"
    effect = "Deny"

    principals {
      type        = "*"
      identifiers = ["*"]
    }

    actions = ["s3:*"]
    resources = [
      aws_s3_bucket.artifacts.arn,
      "${aws_s3_bucket.artifacts.arn}/*",
    ]

    condition {
      test     = "Bool"
      variable = "aws:SecureTransport"
      values   = ["false"]
    }
  }
}

resource "aws_s3_bucket_policy" "artifacts" {
  bucket = aws_s3_bucket.artifacts.id
  policy = data.aws_iam_policy_document.artifacts.json

  depends_on = [aws_s3_bucket_public_access_block.artifacts]
}

data "archive_file" "bootstrap_stub" {
  type        = "zip"
  source_dir  = "${path.module}/bootstrap/stub"
  output_path = "${path.module}/build/packages/bootstrap-stub.zip"
}

resource "aws_s3_object" "bootstrap_stub" {
  bucket         = aws_s3_bucket.artifacts.id
  key            = "functions/bootstrap-stub.zip"
  content_base64 = filebase64(data.archive_file.bootstrap_stub.output_path)
  source_hash    = data.archive_file.bootstrap_stub.output_base64sha256
}