# Modelled after https://securitylab.github.com/research/github-actions-preventing-pwn-requests/

# These "checks" are also performed as part of our critical-path azure-pipelines review,
# however here they are better able to post back to the original PR
name: PR Suggestions

on:
  pull_request:

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2
        with:
          # fetch-depth 50 tries to ensure we capture the whole history of the branch
          fetch-depth: 50

      - uses: actions/cache@v2
        id: cache
        with:
          path: |
            ./vcpkg
          key: ${{ runner.os }}-${{ hashFiles('scripts/bootstrap*') }}

      - name: bootstrap
        if: steps.cache.outputs.cache-hit != 'true'
        run: ./bootstrap-vcpkg.sh

      - name: Save PR number
        run: |
          mkdir -p ./pr
          echo ${{ github.event.number }} > ./pr/NR

      - name: Formatting
        run: |
          git config user.email github-actions
          git config user.name github-actions@github.com

          git diff --name-status --merge-base HEAD^ HEAD --diff-filter=MAR -- '*portfile.cmake' | sed 's/[MAR]\t*//' | while read filename; do grep -q -E '(vcpkg_install_cmake|vcpkg_build_cmake|vcpkg_configure_cmake|vcpkg_fixup_cmake_targets)' "$filename" && echo " - \`$filename\`" || true; done > .github-pr.deprecated-cmake
          ./vcpkg format-manifest --all --convert-control
          git diff > .github-pr.format-manifest
          git add -u
          git commit -m "tmp" --allow-empty
          # HEAD^^ refers to the "main" commit that was merged into
          git checkout HEAD^^ -- versions
          git restore --staged versions
          ./vcpkg x-add-version --all --skip-formatting-check > .github-pr.x-add-version.out
          git diff > .github-pr.x-add-version.diff
          git reset HEAD~ --mixed

      - uses: actions/github-script@v4
        with:
          script: |
            const { promises: fs } = require('fs')
            const add_version = (await fs.readFile('.github-pr.x-add-version.diff', 'utf8')).trim()
            const add_version_out = (await fs.readFile('.github-pr.x-add-version.out', 'utf8')).trim()
            const format = (await fs.readFile('.github-pr.format-manifest', 'utf8')).trim()
            const cmake = (await fs.readFile('.github-pr.deprecated-cmake', 'utf8')).trim()

            let approve = true;
            var output = ''
            if (format !== "") {
              output += "<details><summary><b>All manifest files must be formatted</b></summary>\n\n"
              output += "`./vcpkg format-manifest ports/*/vcpkg.json`\n"
              output += "<details><summary><b>Diff</b></summary>\n\n"
              output += "```diff\n" + format + "\n```\n"
              output += "</details></details>\n\n"
              approve = false;
            }
            if (add_version_out !== "") {
              output += "<details><summary><b>PRs must add only one version and must not modify any published versions</b></summary>\n\n"
              output += "When making any changes to a library, the version or port-version in `vcpkg.json` or `CONTROL` must be modified.\n"
              output += "```\n" + add_version_out + "\n```\n</details>\n"
              approve = false;
            }
            if (add_version !== "") {
              output += "<details><summary><b>After committing all other changes, the version database must be updated</b></summary>\n\n"
              output += "```sh\n"
              output += "git add -u && git commit\n"
              output += "git checkout ${{ github.event.pull_request.base.sha }} -- versions\n"
              output += "./vcpkg x-add-version --all\n"
              output += "```\n"
              output += "<details><summary><b>Diff</b></summary>\n\n"
              output += "```diff\n" + add_version + "\n```\n"
              output += "</details></details>\n\n"
              approve = false;
            }
            if (cmake !== "") {
              output += "You have modified or added at least one portfile where deprecated functions are used.\n"
              output += "<details>\n\n"
              output += "If you feel able to do so, please consider migrating them to the new functions:\n"
              output += "    `vcpkg_install_cmake` -> `vcpkg_cmake_install` (from port `vcpkg-cmake`)\n"
              output += "    `vcpkg_build_cmake` -> `vcpkg_cmake_build` (from port `vcpkg-cmake`)\n"
              output += "    `vcpkg_configure_cmake` -> `vcpkg_cmake_configure` (Please remove the option `PREFER_NINJA`) (from port `vcpkg-cmake`)\n"
              output += "    `vcpkg_fixup_cmake_targets` -> `vcpkg_cmake_config_fixup` (from port `vcpkg-cmake-config`)\n"
              output += "\n"
              output += "In the ports that use the new function, you have to add the corresponding dependencies:\n"
              output += "```json\n"
              output += '{\n  "name": "vcpkg-cmake",\n  "host": true\n},\n'
              output += '{\n  "name": "vcpkg-cmake-config",\n  "host": true\n}\n'
              output += "```\n"
              output += `The following files are affected:\n${cmake}\n`
              output += "</details>\n"
            }

            if (approve) {
              await fs.writeFile("pr/event", "APPROVE")
            } else {
              output = "_This is a new experimental fast check for PR issues. Please let us know if this bot is helpful!_\n\n" + output
              await fs.writeFile("pr/event", "REQUEST_CHANGES")
            }
            await fs.writeFile("pr/body", output)

            console.log(output);

      - uses: actions/upload-artifact@v2
        with:
          name: pr
          path: pr/