# Copyright 2026 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Unified release manager. Supports:
# 1. Cutting a new release candidate branch from main or v1.
# 2. Regenerating/updating the changelog PR on an existing candidate branch.
name: "Release: Cut"

on:
  workflow_dispatch:
    inputs:
      action:
        description: 'Action to perform'
        required: true
        default: 'cut'
        type: choice
        options:
          - cut
          - regenerate
      branch:
        description: 'Branch to release from (main or v1)'
        required: true
        default: 'main'
        type: choice
        options:
          - main
          - v1
      commit_sha:
        description: 'Optional Commit SHA (only used for "cut" action; overrides branch latest)'
        required: false
        type: string

permissions:
  contents: write
  pull-requests: write

jobs:
  cut-or-regenerate:
    if: github.repository == 'google/adk-python'
    runs-on: ubuntu-latest
    steps:
      - name: Determine Branch Configurations
        id: config
        run: |
          BRANCH="${{ inputs.branch }}"
          if [ "$BRANCH" = "v1" ]; then
            echo "base_ref=v1" >> $GITHUB_OUTPUT
            echo "candidate_branch=release/v1-candidate" >> $GITHUB_OUTPUT
            echo "config_file=.github/release-please-config-v1.json" >> $GITHUB_OUTPUT
            echo "manifest_file=.github/.release-please-manifest-v1.json" >> $GITHUB_OUTPUT
          else
            echo "base_ref=main" >> $GITHUB_OUTPUT
            echo "candidate_branch=release/candidate" >> $GITHUB_OUTPUT
            echo "config_file=.github/release-please-config.json" >> $GITHUB_OUTPUT
            echo "manifest_file=.github/.release-please-manifest.json" >> $GITHUB_OUTPUT
          fi

      # Action: CUT NEW RELEASE
      - name: Checkout base ref (Cut)
        if: inputs.action == 'cut'
        uses: actions/checkout@v6
        with:
          ref: ${{ inputs.commit_sha || steps.config.outputs.base_ref }}
          token: ${{ secrets.RELEASE_PAT }}

      - name: Check for existing candidate branch (Cut)
        if: inputs.action == 'cut'
        run: |
          CANDIDATE_BRANCH="${{ steps.config.outputs.candidate_branch }}"
          if git ls-remote --exit-code --heads origin "$CANDIDATE_BRANCH" &>/dev/null; then
            echo "Error: Branch $CANDIDATE_BRANCH already exists."
            echo "Please finalize or delete the existing release candidate before starting a new one."
            exit 1
          fi

      - name: Create and push candidate branch (Cut)
        if: inputs.action == 'cut'
        run: |
          CANDIDATE_BRANCH="${{ steps.config.outputs.candidate_branch }}"
          git checkout -b "$CANDIDATE_BRANCH"
          git push origin "$CANDIDATE_BRANCH"
          echo "Created and pushed branch: $CANDIDATE_BRANCH"

      # Action: REGENERATE EXISTING PR
      - name: Checkout existing candidate branch (Regenerate)
        if: inputs.action == 'regenerate'
        uses: actions/checkout@v6
        with:
          ref: ${{ steps.config.outputs.candidate_branch }}
          token: ${{ secrets.RELEASE_PAT }}

      # Run Release Please
      - name: Run Release Please
        id: release_please
        uses: googleapis/release-please-action@v4
        with:
          token: ${{ secrets.RELEASE_PAT }}
          config-file: ${{ steps.config.outputs.config_file }}
          manifest-file: ${{ steps.config.outputs.manifest_file }}
          target-branch: ${{ steps.config.outputs.candidate_branch }}

      # Curate the changelog: clean up and (for large releases) fold the
      # release-please output, draft a Highlights section on top, commit it back
      # to the release PR branch, and sync the PR description to match. The
      # script falls back to an empty Highlights template if drafting fails, so
      # this step never blocks the release. Guarded on `pr` (not `prs_created`)
      # so it also runs when release-please updates an existing PR (regenerate).
      - name: Set up Python
        if: steps.release_please.outputs.pr != ''
        uses: actions/setup-python@v6
        with:
          python-version: '3.11'

      - name: Install changelog curation dependencies
        if: steps.release_please.outputs.pr != ''
        run: pip install --upgrade google-genai

      - name: Curate changelog Highlights
        if: steps.release_please.outputs.pr != ''
        # Curation is a nice-to-have layered on top of the release PR; never let
        # it turn the release run red (e.g. a push race or a transient error).
        continue-on-error: true
        env:
          RELEASE_PR: ${{ steps.release_please.outputs.pr }}
          GOOGLE_API_KEY: ${{ secrets.GOOGLE_API_KEY }}
          GOOGLE_GENAI_USE_VERTEXAI: '0'
          GH_TOKEN: ${{ secrets.RELEASE_PAT }}
        run: |
          set -euo pipefail
          PR_BRANCH=$(echo "$RELEASE_PR" | jq -r '.headBranchName')
          PR_NUMBER=$(echo "$RELEASE_PR" | jq -r '.number')
          echo "Curating changelog on release PR #$PR_NUMBER (branch: $PR_BRANCH)"
          git fetch origin "$PR_BRANCH"
          git checkout -B "$PR_BRANCH" FETCH_HEAD
          python scripts/curate_changelog.py --changelog CHANGELOG.md \
            --section-out /tmp/pr_body.md
          # Mirror the curated notes into the PR description so reviewers read
          # the same thing that ships in CHANGELOG.md. Done regardless of whether
          # the file changed, since the body is regenerated by release-please.
          if [ -s /tmp/pr_body.md ]; then
            gh pr edit "$PR_NUMBER" --body-file /tmp/pr_body.md
          fi
          if git diff --quiet -- CHANGELOG.md; then
            echo "No changelog file changes to commit."
            exit 0
          fi
          USER_JSON=$(gh api user)
          git config user.name "$(echo "$USER_JSON" | jq -r '.login')"
          git config user.email "$(echo "$USER_JSON" | jq -r '.id')+$(echo "$USER_JSON" | jq -r '.login')@users.noreply.github.com"
          git add CHANGELOG.md
          git commit -m "chore: add curated highlights to changelog"
          # Rebase onto any concurrent PR-branch updates so the push doesn't fail on a stale ref.
          git pull --rebase origin "$PR_BRANCH"
          git push origin "$PR_BRANCH"