#!/usr/bin/env bash

#MISE description="Validate that the Dockerfile builder image exists and supports required architectures"

set -e

source "$(git rev-parse --show-toplevel)/scripts/_helpers.sh"

ensure_working_directory!

required_archs=("amd64" "arm64")

# Parse Dockerfile ARGs
elixir_version=$(grep -E '^ARG ELIXIR_VERSION=' Dockerfile | sed 's/ARG ELIXIR_VERSION=//')
otp_version=$(grep -E '^ARG OTP_VERSION=' Dockerfile | sed 's/ARG OTP_VERSION=//')
debian_version=$(grep -E '^ARG DEBIAN_VERSION=' Dockerfile | sed 's/ARG DEBIAN_VERSION=//')

if [[ -z "$elixir_version" || -z "$otp_version" || -z "$debian_version" ]]; then
  echo "Error: could not parse all version ARGs from Dockerfile"
  exit 1
fi

tag="${elixir_version}-erlang-${otp_version}-debian-${debian_version}"
image="hexpm/elixir:${tag}"

debug_msg "Checking ${image}"

# Obtain anonymous auth token
token=$(curl -sf "https://auth.docker.io/token?service=registry.docker.io&scope=repository:hexpm/elixir:pull" | jq -r '.token')

if [[ -z "$token" || "$token" == "null" ]]; then
  echo "Error: failed to obtain Docker Hub auth token"
  exit 1
fi

# Fetch manifest list
http_code=$(curl -s -o /tmp/manifest.json -w '%{http_code}' \
  -H "Authorization: Bearer ${token}" \
  -H "Accept: application/vnd.docker.distribution.manifest.list.v2+json" \
  "https://registry.hub.docker.com/v2/hexpm/elixir/manifests/${tag}")

if [[ "$http_code" != "200" ]]; then
  debug_msg "Error: image tag not found on Docker Hub (HTTP ${http_code})"
  rm -f /tmp/manifest.json
  exit 1
fi

# Extract supported architectures for linux OS
supported_archs=$(jq -r '.manifests[]? | select(.platform.os == "linux") | .platform.architecture' /tmp/manifest.json)
rm -f /tmp/manifest.json

if [[ -z "$supported_archs" ]]; then
  debug_msg "Error: no linux platform entries found in manifest"
  exit 1
fi

all_valid=true

for arch in "${required_archs[@]}"; do
  if echo "$supported_archs" | grep -qx "$arch"; then
    debug_msg "linux/${arch} supported"
  else
    debug_msg "linux/${arch} NOT supported"
    all_valid=false
  fi
done

if [[ "$all_valid" == true ]]; then
  debug_msg "Image is valid for all required architectures"
else
  debug_msg "Error: image does not support all required architectures"
  exit 1
fi