# USAGE:
# After reviewing the code, core team members may comment on a PR with `!build` followed by optional `<target>` and `<profile>` arguments.
# This matches the syntax of the `cargo run build` CLI command, but allows platforms to be specified.
#
# `<target>`: `web` (default), `desktop` (all platforms), or `desktop:<platforms>` (subset of `windows+mac+linux`)
# `<profile>`: `release` (default) or `debug`
#
# Examples:
# - !build
# - !build debug
# - !build desktop
# - !build desktop:windows+mac
# - !build desktop:linux debug
name: "!build PR Command"

on:
  issue_comment:
    types:
      - created

jobs:
  setup:
    # Command should be limited to core team members (those in the organization) for security.
    # From the GitHub Actions docs:
    # author_association = 'MEMBER': Author is a member of the organization that owns the repository.
    if: >
      github.event.issue.pull_request &&
      github.event.comment.author_association == 'MEMBER' &&
      startsWith(github.event.comment.body, '!build')
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    outputs:
      repo: ${{ steps.pr_info.outputs.repo }}
      ref: ${{ steps.pr_info.outputs.ref }}
      web: ${{ steps.pr_info.outputs.web }}
      windows: ${{ steps.pr_info.outputs.windows }}
      mac: ${{ steps.pr_info.outputs.mac }}
      linux: ${{ steps.pr_info.outputs.linux }}
      debug: ${{ steps.pr_info.outputs.debug }}

    steps:
      - name: 🔎 Parse command, find branch, and set build flags
        id: pr_info
        run: |
          COMMENT="${{ github.event.comment.body }}"

          # Split into space-separated words
          read -ra WORDS <<< "$COMMENT"

          # First word must be "!build"
          if [[ "${WORDS[0]}" != "!build" ]]; then
            echo "::error::Expected comment to start with !build"
            exit 1
          fi

          # Initialize build flags (web defaults to true, matching the CLI default target)
          WEB="true"
          WINDOWS="false"
          MAC="false"
          LINUX="false"
          DEBUG="false"

          # Parse target (optional, defaults to `web` if omitted)
          IDX=1
          case "${WORDS[$IDX]:-}" in
            # Target: `web` enables just the web build (already the default, but accepted explicitly)
            "web")
              ((IDX++)) ;;
            # Target: `desktop` enables all three desktop platforms
            "desktop")
              WEB="false"; WINDOWS="true"; MAC="true"; LINUX="true"; ((IDX++)) ;;
            # Target: `desktop:<platforms>` enables a subset of desktop platforms, split by `+`
            desktop:*)
              WEB="false"
              PLATFORMS="${WORDS[$IDX]#desktop:}"
              IFS='+' read -ra PARTS <<< "$PLATFORMS"
              for PART in "${PARTS[@]}"; do
                case "$PART" in
                  "windows") WINDOWS="true" ;;
                  "mac")     MAC="true" ;;
                  "linux")   LINUX="true" ;;
                  *) echo "::error::Unrecognized platform: $PART"; exit 1 ;;
                esac
              done
              ((IDX++))
              ;;
          esac

          # Parse profile (optional, defaults to `release` if omitted)
          case "${WORDS[$IDX]:-}" in
            "debug")   DEBUG="true"; ((IDX++)) ;;
            "release") ((IDX++)) ;;
          esac

          # Reject any unexpected trailing words
          if [[ $IDX -lt ${#WORDS[@]} ]]; then
            echo "::error::Unexpected argument: ${WORDS[$IDX]}"
            exit 1
          fi

          # Write parsed build flags to job outputs
          echo "web=$WEB" >> $GITHUB_OUTPUT
          echo "windows=$WINDOWS" >> $GITHUB_OUTPUT
          echo "mac=$MAC" >> $GITHUB_OUTPUT
          echo "linux=$LINUX" >> $GITHUB_OUTPUT
          echo "debug=$DEBUG" >> $GITHUB_OUTPUT

          # Fetch the PR's head branch and repo (needed for forked PRs where the code lives in another repo)
          RESPONSE=$(curl -L -H 'Accept: application/vnd.github+json' -H 'X-GitHub-Api-Version: 2022-11-28' https://api.github.com/repos/${{ github.repository }}/pulls/${{ github.event.issue.number }})
          echo "repo=$(echo $RESPONSE | jq -r '.head.repo.full_name')" >> $GITHUB_OUTPUT
          echo "ref=$(echo $RESPONSE | jq -r '.head.ref')" >> $GITHUB_OUTPUT

      - name: 💬 Edit comment with workflow run link
        uses: actions/github-script@v8
        with:
          script: |
            github.rest.issues.updateComment({
              comment_id: ${{ github.event.comment.id }},
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: '${{ github.event.comment.body }} ([Run ID ' + context.runId + '](https://github.com/GraphiteEditor/Graphite/actions/runs/' + context.runId + '))'
            });

  invoke-build:
    needs: setup
    uses: ./.github/workflows/build.yml
    secrets: inherit
    with:
      web: ${{ needs.setup.outputs.web == 'true' }}
      windows: ${{ needs.setup.outputs.windows == 'true' }}
      mac: ${{ needs.setup.outputs.mac == 'true' }}
      linux: ${{ needs.setup.outputs.linux == 'true' }}
      debug: ${{ needs.setup.outputs.debug == 'true' }}
      checkout_repo: ${{ needs.setup.outputs.repo }}
      checkout_ref: ${{ needs.setup.outputs.ref }}
      pr_number: ${{ github.event.issue.number }}