#!/bin/sh
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)")

output=$(mktemp)

{
    cat <<EOF
name: Nix flake checks

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

jobs:
  _checks:
    needs: $checks
    runs-on: native
    steps:
      - run: true

  _complete:
    runs-on: native
    steps:
      - uses: actions/checkout@v4
      - run: .forgejo/workflows/nix-flake-check.sh check
EOF

    for check in $(echo "$checks" | jq -r .[]); do
        cat <<EOF

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

target=$(basename "$0" .sh).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