#! /usr/bin/env sh
# shellcheck shell=bash

# generate CI checks or verify they are up to date
set -euC

cd "$(dirname "$0")" || exit 3

nix_eval () { nix eval --impure --raw --expr "with builtins; $1"; }
system=$(nix_eval "currentSystem")
checks=$(nix_eval "toJSON (attrNames (getFlake (toString ../..)).checks.$system)")

for check in $(echo "$checks" | jq -r .[]); do
  output=$(mktemp)
{
  cat <<EOF
name: $check

on:
  pull_request:
    types:
      - opened
      - synchronize
      - reopened
  push:
    branches:
      - main

concurrency:
  cancel-in-progress: true
  group: \${{ forgejo.workflow }}-\${{ forgejo.event.pull_request.number || forgejo.ref }}

jobs:
  $check:
    runs-on: native
    steps:
      - uses: actions/checkout@v4
      - run: nix build .#checks.$system.$check -vL
EOF
} >| "$output"

  target="${check}.yaml"

  if [ $# -eq 1 ] && [ "$1" = "check" ]; then
      if ! diff_output=$(diff --color=always "$target" "$output"); then
          printf >&2 'Changes detected (\e[31m< current\e[0m | \e[32m> generated\e[0m):\n%s\n' "$diff_output"
          exit 1
      fi
  else
      mv "$output" "$target"
  fi
done