# variables
variable "TAG" {
  default = "latest"
}
variable "LINUX_DISTRO" {
  default = "alpine"
}
variable "IMAGE_NAME" {
  default = "alpine"
}
variable "BASE_IMAGE" {
  default = "alpine"
}

function "tag" {
  params = [suffix]
  result = [format("${IMAGE_NAME}%s:${TAG}", notequal("", suffix) ? "-${suffix}" : "")]
}
# groups
group "dev" {
  targets = ["amd"]
}
group "default" {
  targets = ["amd"]
}
group "deploy" {
  targets = ["multi"]
}
group "private" {
  targets = [
    "amd",
    "arm"
  ]
}
# intended for use with default local docker builder     
# uses 'dev' group in docker-bake.hcl   
# assume dev machine is amd64 machine
target "amd" {
  context    = "."
  dockerfile = "Dockerfile"
  args = {
    LINUX_DISTRO = "${LINUX_DISTRO}"
    BASE_IMAGE   = "${BASE_IMAGE}"
    TAG          = "${TAG}"
  }
  tags      = tag("")
  platforms = ["linux/amd64"]
}

# intended for use with default docker driver on an arm64 machine 
# use with 'arm' group 
target "arm" {
  inherits  = ["amd"]
  tags      = tag("arm64")
  platforms = ["linux/arm64"]
}

# must use with docker-container driver for multiarch image deployment to registry
# uses 'deploy' group in docker-bake.hcl
target "multi" {
  inherits  = ["amd"]
  tags      = tag("")
  platforms = ["linux/amd64", "linux/arm64"]
  output    = ["type=registry"]
}


// variable "RUSER" {
//   default = ""
// }
// function "user" {
//   params = []
//   result = [notequal("", RUSER) ? "${RUSER}/" : ""]
// }

// function "tagamd" {
//   params = []
//   result = [
//     format("%s${LINUX_DISTRO}:${TAG}", notequal("", RUSER) ? "${RUSER}/" : ""),
//     format("%s${LINUX_DISTRO}-amd64:${TAG}", notequal("", RUSER) ? "${RUSER}/" : "")
//   ]
// }