name: Rename Go module

on:
  workflow_dispatch:
    inputs:
      source_commit:
        description: 'Upstream commit on which to base module renaming'
        required: true
        type: string
        default: '2bd6bd01d2e8561dd7fc21b631f4a34ac16627a1'

jobs:
  rename-module:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0 # everything

      - name: Set variables
        id: vars
        # Including hashes of both the source commit and the workflow file makes
        # this idempotent.
        env:
          WORKFLOW_HASH: ${{ hashFiles('.github/workflows/rename-module.yml') }}
        run: |
          echo "WORKFLOW_HASH=${WORKFLOW_HASH}" >> "$GITHUB_OUTPUT";
          echo "DEST_BRANCH=auto-rename-module_source-${{ inputs.source_commit }}_workflow-${WORKFLOW_HASH}-${{ github.ref_name }}" \
            >> "$GITHUB_OUTPUT";

      - name: Check out source commit
        run: git checkout ${{ inputs.source_commit }}

      - name: Globally update module name
        run: |
          go mod edit -module github.com/ava-labs/libevm;
          find . -iname '*.go' -o -iname '*.txt' | xargs sed -i -E \
            's|(["`]github\.com/)ethereum/go-ethereum|\1ava-labs/libevm|g';

      - name: Remnant references
        run: |
          find . -type f | \
            xargs grep -In github.com/ethereum/go-ethereum | \
            grep -v "https://github.com/ethereum/go-ethereum"
      
      - name: Set up Go
        uses: actions/setup-go@v5
        with:
          go-version: 1.21.4

      - name: Smoke tests
        # `go list` shows us the module name and grep will non-zero exit on mismatch
        # `go build` is a rudimentary but broad test of correctness
        # The explicitly tested packages are edge cases:
        # - bind generates tests and a go.mod on the fly
        # - rlpgen has testdata with imports that need updating
        run: |
          go list . | grep ava-labs/libevm;
          go build ./...;
          go test ./accounts/abi/bind ./rlp/rlpgen

      - name: Create new branch
        env:
          BRANCH: ${{ steps.vars.outputs.DEST_BRANCH }}
        run: |
          git checkout -b "${BRANCH}";
          git push origin "${BRANCH}";

      - name: Commit to new branch
        uses: planetscale/ghcommit-action@d4176bfacef926cc2db351eab20398dfc2f593b5 # v0.2.0
        env:
          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
        with:
          commit_message: "[AUTO] rename Go module + update internal import paths\n\nWorkflow: ${{ steps.vars.outputs.WORKFLOW_HASH }} on branch ${{ github.ref_name }}"
          repo: ${{ github.repository }}
          branch: ${{ steps.vars.outputs.DEST_BRANCH }}