name: Create new Node.js patch

on:
  workflow_dispatch:
    inputs:
      nodeVersion:
        description: 'Node.js version (e.g. 20.11.0)'
        default: ''
        type: string
        required: true
      patchFile:
        description: 'Patch version to use (e.g. 20.11.0). Leave empty to use the matching major patch'
        default: ''
        type: string
        required: false

jobs:
    build:
        permissions:
            contents: write
            pull-requests: write
        runs-on: ubuntu-latest
        steps:
            - uses: actions/checkout@v4
            
            - name: Checkout nodejs and create new patch
              run: |
                # find the patch file by checking the patch file matching major version input node version
                MAJOR_VERSION=$(echo ${{ inputs.nodeVersion }} | cut -d'.' -f1)
                echo "Node.js major version: $MAJOR_VERSION"

                if [ -z "${{ inputs.patchFile }}" ]; then
                  PATCH_FILE=$(ls patches/node.v$MAJOR_VERSION.*.patch)
                else
                  PATCH_FILE=patches/node.v${{ inputs.patchFile }}.cpp.patch
                fi

                # extract patch version from PATCH_FILE. E.g. node.v20.11.1.cpp.patch -->  20.11.1
                PATCH_VERSION=$(echo $PATCH_FILE | grep -oP 'node.v\K[0-9]+\.[0-9]+\.[0-9]+')

                echo "Patch file: $PATCH_FILE"

                # check if patch file exists
                if [ ! -f "$PATCH_FILE" ]; then
                  echo "No patch file found for Node.js version ${{ inputs.nodeVersion }}"
                  exit 1
                fi

                cd ..
                echo "Cloning Node.js repository"
                git clone -b v${{ inputs.nodeVersion }} --single-branch https://github.com/nodejs/node.git
                cd node

                # apply the patch, if there are conflicts exit with error
                echo "Applying patch $PATCH_FILE"
                git apply --check ../pkg-fetch/$PATCH_FILE
                if [ $? -ne 0 ]; then
                  echo "Patch $PATCH_FILE does not apply cleanly"
                  exit 1
                fi

                echo "Patch $PATCH_FILE applies cleanly, creating new patch file"
                git apply ../pkg-fetch/$PATCH_FILE
                # delete old patch file and create new one
                rm -rf ../pkg-fetch/$PATCH_FILE
                
                git add -A
                git diff --staged --src-prefix=node/ --dst-prefix=node/ > ../pkg-fetch/patches/node.v${{ inputs.nodeVersion }}.cpp.patch

                # Update patches.json
                echo "Updating patches.json"
                cd ../pkg-fetch/patches
                
                sed -i "s/\"v$PATCH_VERSION\": \[\"node.v$PATCH_VERSION.cpp.patch\"\]/\"v${{ inputs.nodeVersion }}\": \[\"node.v${{ inputs.nodeVersion }}.cpp.patch\"\]/" patches.json
            
            - name: Create Pull Request
              uses: peter-evans/create-pull-request@v4
              with:
                token: ${{ secrets.GITHUB_TOKEN }}
                commit-message: "feat: add v${{ inputs.nodeVersion }} patch"
                title: "feat: add v${{ inputs.nodeVersion }} patch"
                body: "This PR bumps the Node.js patch version to v${{ inputs.nodeVersion }}"
                branch: "nodejs-v${{ inputs.nodeVersion }}"
                base: "main"
                delete-branch: true
                labels: "enhancement, nodejs"
                draft: false