name: accept-pull-request

on:
  issue_comment:
    types:
      - created

concurrency: accept-pull-request-${{ github.event.issue.number }}

jobs:
  accept-pull-request:
    if: ${{ github.event.issue.pull_request && (github.event.comment.body == '/accept' || github.event.comment.body == '/accept --force') }}
    env:
      GITHUB_CONTEXT: ${{ toJson(github) }}    
      GITHUB_TOKEN: ${{ secrets.HURL_BOT_TOKEN }}
      OWNER: ${{ github.repository_owner }}
      REPO: ${{ github.event.repository.name }}
      PR_NUMBER: ${{ github.event.issue.number }}
      COMMENT_USER_LOGIN: ${{ github.event.comment.user.login }}
      PR_COMMENT: ${{ github.event.comment.body }}
    outputs:
      base_ref: ${{ steps.init-all-internal-env-vars.outputs.base_ref }}
      new_version_master_snapshot_version:  ${{ steps.check-github-release.outputs.new_version_master_snapshot_version }}
      is_a_github_release_pr: ${{ steps.check-github-release.outputs.is_a_github_release_pr }}
    name: accept-pull-request
    runs-on: ubuntu-latest
    steps:

      - name: Check user permission
        run: |
          comment_user_permission=$(gh api repos/"${OWNER}"/"${REPO}"/collaborators/"${COMMENT_USER_LOGIN}"/permission -q .permission)
          if [ "${comment_user_permission}" = "admin" ] ; then
            echo "  - ✅ You have the ${comment_user_permission} permission then you are allowed to merge pull request n°${PR_NUMBER}"
          else
            comment="❌ Sorry \`${COMMENT_USER_LOGIN}\`, you are not allowed to merge this pull request because you do not have admin permission (actual permission=${comment_user_permission})."
            echo "  - ${comment}"
            gh pr comment "${PR_NUMBER}" --body "${comment}"
            exit 1
          fi

      - name: Init all internal env vars
        id: init-all-internal-env-vars
        run: |
          pr_detail_file="pr_detail.json"
          gh api repos/"${OWNER}"/"${REPO}"/pulls/"${PR_NUMBER}" > "${pr_detail_file}"
          jq . "${pr_detail_file}"
          echo "github.event.issue.title: ${{ github.event.issue.title }}"
          HEAD_REPO_FULL_NAME=$(jq -rc .head.repo.full_name ${pr_detail_file})
          BASE_REPO_FULL_NAME=$(jq -rc .base.repo.full_name ${pr_detail_file})
          if [ "${HEAD_REPO_FULL_NAME}" = "${BASE_REPO_FULL_NAME}" ] ; then
            HEAD_TYPE=origin
          else
            HEAD_TYPE=fork
          fi        
          echo "HEAD_REPO_FULL_NAME=${HEAD_REPO_FULL_NAME}" | tee -a "${GITHUB_ENV}"
          echo "BASE_REPO_FULL_NAME=${BASE_REPO_FULL_NAME}" | tee -a "${GITHUB_ENV}"
          echo "HEAD_TYPE=${HEAD_TYPE}" | tee -a "${GITHUB_ENV}"
          echo "HEAD_REF=$(jq -rc .head.ref ${pr_detail_file})" | tee -a "${GITHUB_ENV}"
          echo "BASE_REF=$(jq -rc .base.ref ${pr_detail_file})" | tee -a "${GITHUB_ENV}"
          echo "PR_STATE=$(jq -rc .state ${pr_detail_file})" | tee -a "${GITHUB_ENV}"
          echo "PR_DRAFT=$(jq -rc .draft ${pr_detail_file})" | tee -a "${GITHUB_ENV}"
          echo "PR_MERGEABLE=$(jq -rc .mergeable ${pr_detail_file})" | tee -a "${GITHUB_ENV}"
          echo "REMAINING_COMMITS_FILE=remaining_commits.txt" | tee -a "${GITHUB_ENV}"           
          echo "NEW_COMMITS_FILE=new_commits.txt" | tee -a "${GITHUB_ENV}"
          echo "base_ref=$(jq -rc .base.ref ${pr_detail_file})" | tee -a "${GITHUB_OUTPUT}"

      - name: Checkout repository
        uses: actions/checkout@v3
        with:
          ref: ${{ env.BASE_REF }}
          token: ${{ secrets.HURL_BOT_TOKEN }}
          fetch-depth: 0

      - name: Notify user
        run: |
          if [[ "${PR_COMMENT}" =~ "--force" ]] ; then
            order="/accept --force"
          else
            order="/accept"
          fi
          comment="🕗 [${order}](${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID}) is running, please wait for completion."
          gh pr comment "${PR_NUMBER}" --body "${comment}"

      - name: Init git bot context
        uses: crazy-max/ghaction-import-gpg@v5
        with:
          gpg_private_key: ${{ secrets.HURL_BOT_GPG_PRIVATE_KEY }}
          passphrase: ${{ secrets.HURL_BOT_GPG_PRIVATE_KEY_PASSPHRASE }}
          git_committer_name: "hurl-bot"
          git_committer_email: "bot@hurl.dev"
          git_user_signingkey: true
          git_commit_gpgsign: true

      - name: Add fork source branch
        if: env.HEAD_TYPE == 'fork'
        run: |
          git remote add fork https://github.com/${{ env.HEAD_REPO_FULL_NAME}}
          git remote --verbose
          git fetch --all

      - name: Check if pull request state is open
        run: |
          if [ "${{ env.PR_STATE }}" = "open" ] ; then
            echo "  - ✅ Pull request is ${{ env.PR_STATE }}."
          else
            comment="❌ Can not merge this pull request because it is not open (actual state=${{ env.PR_STATE }})."
            echo "  - ${comment}"
            gh pr comment "${PR_NUMBER}" --body "${comment}"
            exit 1
          fi

      - name: Check if pull request is ready
        run: |
          if [ "${{ env.PR_DRAFT }}" = "false" ] ; then
            echo "  - ✅ Pull request draft state is ${{ env.PR_DRAFT }}."
          else
            comment="❌ Can not merge this pull request because it is still in draft."
            echo "  - ${comment}"
            gh pr comment "${PR_NUMBER}" --body "${comment}"
            exit 1         
          fi

      - name: Check if pull request is mergeable
        run: |
          if [ "${{ env.PR_MERGEABLE }}" = "true" ] ; then
            echo "  - ✅ Pull request mergeable state is ${{ env.PR_MERGEABLE }}."
          else
            comment="❌ Pull request is not mergeable, please check unresolved discussions and pull request messages."
            echo "  - ${comment}"
            gh pr comment "${PR_NUMBER}" --body "${comment}"
            exit 1         
          fi

      - name: Check GitHub release
        id: check-github-release
        run: |
          if [ $(echo ${{ env.HEAD_REF }} | grep -Ec '^release/') -eq 0 ] ; then
            echo "  - ✅ Pull request is not about a pending GitHub release."
          else
            echo "is_a_github_release_pr=true" | tee -a "${GITHUB_OUTPUT}"
            tag_version="$(echo ${{ env.HEAD_REF }} | cut --delimiter '/' --field 2)"
            major=$(echo "${tag_version}" | cut --delimiter "." --field 1)
            minor=$(echo "${tag_version}" | cut --delimiter "." --field 2)
            new_minor="$((minor + 1))"
            echo "major=${major}, minor=${minor}, new_minor=${new_minor}"
            new_version_master_snapshot_version="${major}.${new_minor}.0-SNAPSHOT"
            echo "new_version_master_snapshot_version=${new_version_master_snapshot_version}" | tee -a "${GITHUB_OUTPUT}"
            gh_result=$(gh api repos/"${OWNER}"/"${REPO}"/releases/tags/"${tag_version}" | tr ":" "=" | tr -d '"' | tr -d " ")
            echo "gh_result=${gh_result}"
            if [ $(echo "${gh_result}" | grep -Ec "message=NotFound|prerelease=true") -eq 0 ] ; then
              comment="✅ Github release ${tag_version}  is published."
              echo "  - ${comment}"
            else
              comment="👁‍🗨 Github release ${tag_version} is still in draft/prerelease. Please don't forget to publish it after merging this release PR."
              echo "  - ${comment}"
              gh pr comment "${PR_NUMBER}" --body "${comment}"
            fi
          fi

      - name: Check if source branch is rebased from target branch 
        run: |
          git log --oneline --cherry ${{ env.HEAD_TYPE }}/${{ env.HEAD_REF }}...origin/${{ env.BASE_REF }} > "${{ env.REMAINING_COMMITS_FILE }}" && exit_code=0 || exit_code=1
          if [ ${exit_code} -eq 1 ] ; then
            comment="❌ Rebase check fails. Please refer to ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID} logs."
            echo "  - ${comment}"
            gh pr comment "${PR_NUMBER}" --body "${comment}"
            exit 1
          fi
          diff_count=$(grep -c ^+ ${{ env.REMAINING_COMMITS_FILE }} || true)
          if [ ${diff_count} -eq 0 ] ; then
            echo "  - ✅ ${{ env.HEAD_REPO_FULL_NAME}}/${{ env.HEAD_REF }} is already rebased from ${{ env.BASE_REPO_FULL_NAME}}/${{ env.BASE_REF }}."
          else
            if [ ${{ env.HEAD_TYPE }} == "fork" ] ; then
              comment="❌ You have to rebase \`${{ env.HEAD_REPO_FULL_NAME}}/${{ env.HEAD_REF }}\` branch because there are new commits pending on target \`${{ env.BASE_REPO_FULL_NAME}}/${{ env.BASE_REF }}\` branch (sorry i can't auto rebase from a fork):<br>$(echo ; sed "s/+/-/g" ${{ env.REMAINING_COMMITS_FILE }})"
              echo "  - ${comment}"
              gh pr comment "${PR_NUMBER}" --body "${comment}"              
              exit 1
            fi
            git fetch
            git checkout ${{ env.HEAD_TYPE }}/${{ env.HEAD_REF }}
            git switch ${{ env.HEAD_REF }}
            git pull
            git rebase origin/${{ env.BASE_REF }} && exit_code=0 || exit_code=1
            if [ ${exit_code} -eq 1 ] ; then
              comment="❌ Auto rebase from \`${{ env.BASE_REPO_FULL_NAME}}/${{ env.BASE_REF }}\` fails due to conflicts. Sorry but you have to manage this manually. Please refer to ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID} logs."
              echo "  - ${comment}"
              gh pr comment "${PR_NUMBER}" --body "${comment}" 
              exit 1  
            fi
            git push --force && exit_code=0 || exit_code=1
            if [ ${exit_code} -eq 0 ] ; then
              comment="🔨 Auto rebase from \`${{ env.BASE_REPO_FULL_NAME}}/${{ env.BASE_REF }}\` succeeds, \`${{ env.HEAD_REPO_FULL_NAME}}/${{ env.HEAD_REF }}\` now embeds these commits:<br>$(echo ; sed "s/+/-/g" ${{ env.REMAINING_COMMITS_FILE }})"
              echo "  - ${comment}"
              gh pr comment "${PR_NUMBER}" --body "${comment}"
              if [[ "${PR_COMMENT}" =~ "--force" ]] ; then
                order="/accept --force"
              else
                order="/accept"
              fi
              comment="🕗 [${order}](${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID}) is running, please wait for completion."
              gh pr comment "${PR_NUMBER}" --body "${comment}"
              sleep 15
            else
              comment="❌ Auto rebase from \`${{ env.BASE_REPO_FULL_NAME}}/${{ env.BASE_REF }}\` fails on `git push --force`. Please refer to ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID} logs."
              echo "  - ${comment}"
              gh pr comment "${PR_NUMBER}" --body "${comment}"  
            fi
            git switch ${{ env.BASE_REF }}
          fi

      - name: Check if pull request checks are successful
        if: ${{ !contains(github.event.comment.body, '--force') }}
        run: |
          gh pr checks "${PR_NUMBER}" --watch --interval 30 && exit_code=0 || exit_code=$?
          if [ "${exit_code}" -eq 0 ] ; then
            echo "  - ✅ Pull request checks are successful."
          else
            comment="❌ Some checks are still failing, please fix them before trying to merge this pull request."
            echo "  - ${comment}"
            gh pr comment "${PR_NUMBER}" --body "${comment}"
            exit 1
          fi

      - name: Check if source branch is rebased from target branch 
        run: |
          git pull
          git log --oneline --cherry ${{ env.HEAD_TYPE }}/${{ env.HEAD_REF }}...origin/${{ env.BASE_REF }} > "${{ env.REMAINING_COMMITS_FILE }}" && exit_code=0 || exit_code=1
          if [ ${exit_code} -eq 1 ] ; then
            comment="❌ Rebase check fails. Please refer to ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID} logs."
            echo "  - ${comment}"
            gh pr comment "${PR_NUMBER}" --body "${comment}"
            exit 1
          fi
          diff_count=$(grep -c ^+ ${{ env.REMAINING_COMMITS_FILE }} || true)
          if [ ${diff_count} -eq 0 ] ; then
            echo "  - ✅ ${{ env.HEAD_REPO_FULL_NAME}}/${{ env.HEAD_REF }} is already rebased from ${{ env.BASE_REPO_FULL_NAME}}/${{ env.BASE_REF }}."
          else
            if [ ${{ env.HEAD_TYPE }} == "fork" ] ; then
              comment="❌ New commits have been pushed to \`${{ env.BASE_REPO_FULL_NAME}}/${{ env.BASE_REF }}\` since you accept this PR. You have to rebase \`${{ env.HEAD_REPO_FULL_NAME}}/${{ env.HEAD_REF }}\` branch by yourself because i can't auto rebase from a fork.<br>Pending commits:<br>$(echo ; sed "s/+/-/g" ${{ env.REMAINING_COMMITS_FILE }})"
              echo "  - ${comment}"
              gh pr comment "${PR_NUMBER}" --body "${comment}"              
              exit 1
            else
              comment="❌ New commits have been pushed to \`${{ env.BASE_REPO_FULL_NAME}}/${{ env.BASE_REF }}\` since you accept this PR. You can rebase it by yourself or simply re-accept this PR to execute an auto rebase.<br>Pending commits:<br>$(echo ; sed "s/+/-/g" ${{ env.REMAINING_COMMITS_FILE }})"
              echo "  - ${comment}"
              gh pr comment "${PR_NUMBER}" --body "${comment}"
              exit 1
            fi
          fi

      - name: Get new commits list
        run: |
          git log --oneline --cherry origin/${{ env.BASE_REF }}...${{ env.HEAD_TYPE }}/${{ env.HEAD_REF }} | tee ${{ env.NEW_COMMITS_FILE }}

      - name: Merge fast forward head ref to base ref 
        run: |
          git merge ${{ env.HEAD_TYPE }}/${{ env.HEAD_REF }} --ff-only && exit_code=0 || exit_code=1
          if [ ${exit_code} -eq 0 ] ; then
            echo "  - ✅ Merge fast forward succeeds."
          else
            comment="❌ Merge fast forward fails. Please refer to ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID} logs."
            echo "  - ${comment}"
            gh pr comment "${PR_NUMBER}" --body "${comment}"
            exit 1         
          fi
          git push && exit_code=0 || exit_code=1
          if [ ${exit_code} -eq 0 ] ; then
            echo "  - ✅ Push merge fast forward succeeds."
          else
            comment="❌ Push merge fast forward fails. Please refer to ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID} logs."
            echo "  - ${comment}"
            gh pr comment "${PR_NUMBER}" --body "${comment}"
            exit 1         
          fi

      - name: Close pull request
        run: |
          if [[ "${PR_COMMENT}" =~ "--force" ]] ; then
            comment="✅ Pull request merged without waiting for checks and closed by \`${COMMENT_USER_LOGIN}\` with fast forward merge."          
          else
            comment="✅ Pull request merged and closed by \`${COMMENT_USER_LOGIN}\` with fast forward merge."
          fi
          gh pr close "${PR_NUMBER}" --delete-branch --comment "${comment}.<br><br>\# List of commits merged from \`${{ env.HEAD_REPO_FULL_NAME}}/${{ env.HEAD_REF }}\` branch into \`${{ env.BASE_REPO_FULL_NAME}}/${{ env.BASE_REF }}\` branch:<br>$(echo ; sed "s/+/-/g" ${{ env.NEW_COMMITS_FILE }})" && exit_code=0 || exit_code=1
          if [ ${exit_code} -eq 0 ] ; then
            echo "  - ${comment}"     
          else
            comment="❌ A problem occurred when closing pull request and/or deleting branch."
            echo "  - ${comment}"
            #gh pr comment "${PR_NUMBER}" --body "${comment} Please refer to ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID} logs."
            #exit 1       
          fi