name: Update upstream version

on:
  schedule:
    - cron: "17 2 * * *"
  workflow_dispatch:

permissions:
  contents: write

concurrency:
  group: update-upstream
  cancel-in-progress: true

jobs:
  update:
    runs-on: ubuntu-latest

    steps:
      - name: Check out repository
        uses: actions/checkout@v4

      - name: Update version in flake.nix
        id: update
        env:
          GH_TOKEN: ${{ github.token }}
        shell: bash
        run: |
          set -euo pipefail

          latest_tag="$(curl --fail --silent --show-error --location \
            -H 'Accept: application/vnd.github+json' \
            -H "Authorization: Bearer $GH_TOKEN" \
            https://api.github.com/repos/farion1231/cc-switch/releases/latest \
            | jq --exit-status --raw-output '.tag_name')"
          latest_version="${latest_tag#v}"

          if [[ ! "$latest_tag" =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
            echo "Unsupported upstream release tag: $latest_tag" >&2
            exit 1
          fi

          current_version="$(sed -nE \
            's/^[[:space:]]*version = "([^"]+)";/\1/p' \
            flake.nix | head -n 1)"
          if [[ -z "$current_version" ]]; then
            echo "Could not find the package version in flake.nix" >&2
            exit 1
          fi

          newest_version="$(printf '%s\n' "$current_version" "$latest_version" | sort -V | tail -n 1)"
          if [[ "$current_version" == "$latest_version" || "$newest_version" != "$latest_version" ]]; then
            echo "No newer release available; current version is $current_version"
            echo "updated=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi

          current_pattern="${current_version//./\\.}"
          sed -i -E "s/${current_pattern}/${latest_version}/g" flake.nix

          echo "Updated CC Switch from $current_version to $latest_version"
          echo "updated=true" >> "$GITHUB_OUTPUT"
          echo "version=$latest_version" >> "$GITHUB_OUTPUT"

      - name: Commit and push version update
        if: steps.update.outputs.updated == 'true'
        env:
          VERSION: ${{ steps.update.outputs.version }}
        shell: bash
        run: |
          set -euo pipefail
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git add flake.nix
          git commit -m "chore: update cc-switch to $VERSION"
          git push