name: '🧠 Gemini CLI Bot: Brain'

on:
  schedule:
    - cron: '0 0 * * *' # Every 24 hours
  workflow_dispatch:
    inputs:
      clear_memory:
        description: 'Clear memory (drops learnings from previous runs)'
        type: 'boolean'
        default: false
      enable_prs:
        description: 'Enable PRs (automatically promote changes to PRs)'
        type: 'boolean'
        default: false

concurrency:
  group: '${{ github.workflow }}-${{ github.ref }}'
  cancel-in-progress: true

jobs:
  reasoning:
    name: 'Brain (Reasoning Layer)'
    runs-on: 'ubuntu-latest'
    if: "github.repository == 'google-gemini/gemini-cli'"
    # The reasoning phase is strictly readonly.
    permissions:
      contents: 'read'
      issues: 'read'
      pull-requests: 'read'
      actions: 'read'
    env:
      GEMINI_CLI_TRUST_WORKSPACE: 'true'
    steps:
      - name: 'Checkout'
        uses: 'actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8' # ratchet:actions/checkout@v5
        with:
          fetch-depth: 0
          persist-credentials: false

      - name: 'Setup Node.js'
        uses: 'actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020' # ratchet:actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'

      - name: 'Install dependencies'
        run: 'npm ci'

      - name: 'Build Gemini CLI'
        run: 'npm run bundle'

      - name: 'Download Previous State'
        env:
          GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}'
        run: |
          if [ "${{ github.event.inputs.clear_memory }}" = "true" ]; then
            echo "Memory clear requested. Skipping previous state download."
            exit 0
          fi

          # Find the last successful run of this workflow
          LAST_RUN_ID=$(gh run list --workflow "${{ github.workflow }}" --status success --limit 1 --json databaseId --jq '.[0].databaseId')

          if [ -n "$LAST_RUN_ID" ]; then
            echo "Found previous successful run: $LAST_RUN_ID"

            # Download brain memory (all state in one artifact)
            gh run download "$LAST_RUN_ID" -n brain-data -D . || echo "brain-data not found"
          else
            echo "No previous successful run found."
          fi

      - name: 'Collect Current Metrics'
        env:
          GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}'
        run: 'npx tsx tools/gemini-cli-bot/metrics/index.ts'

      - name: 'Run Brain Phases'
        env:
          GEMINI_API_KEY: '${{ secrets.GEMINI_API_KEY }}'
          GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}'
          GEMINI_MODEL: 'gemini-3-flash-preview'
          ENABLE_PRS: "${{ github.event.inputs.enable_prs || 'false' }}"
        run: 'node bundle/gemini.js --policy tools/gemini-cli-bot/ci-policy.toml -p "$(cat tools/gemini-cli-bot/brain/metrics.md)"'

      - name: 'Run Critique Phase'
        if: "${{ github.event.inputs.enable_prs == 'true' }}"
        env:
          GEMINI_API_KEY: '${{ secrets.GEMINI_API_KEY }}'
          # This token is strictly readonly as enforced by the job-level permissions.
          GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}'
          GEMINI_MODEL: 'gemini-3-flash-preview'
        run: |
          if git diff --staged --quiet; then
             echo "No changes staged. Skipping critique."
             echo "[APPROVED]" > critique_result.txt
          else
             node bundle/gemini.js --policy tools/gemini-cli-bot/ci-policy.toml -p "$(cat tools/gemini-cli-bot/brain/critique.md)" 2>&1 | tee critique_output.log

             # PIPESTATUS[0] captures the exit code of the node command before the pipe
             if [ "${PIPESTATUS[0]}" -ne 0 ] || grep -q "\[REJECTED\]" critique_output.log; then
               echo "Critique failed or rejected changes. Skipping PR creation."
               echo "[REJECTED]" > critique_result.txt
             else
               echo "[APPROVED]" > critique_result.txt
             fi
          fi

      - name: 'Generate Patch'
        if: "${{ github.event.inputs.enable_prs == 'true' }}"
        run: |
          touch bot-changes.patch
          touch pr-description.md
          if [ -f critique_result.txt ] && grep -q "\[REJECTED\]" critique_result.txt; then
             echo "Critique rejected. Skipping patch generation."
          else
             git diff --staged > bot-changes.patch
          fi

      - name: 'Archive Brain Data'
        uses: 'actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02' # ratchet:actions/upload-artifact@v4
        with:
          name: 'brain-data'
          path: |
            tools/gemini-cli-bot/lessons-learned.md
            tools/gemini-cli-bot/history/*.csv
            bot-changes.patch
            pr-description.md
            branch-name.txt
            pr-comment.md
            pr-number.txt
          retention-days: 90

  publish:
    name: 'Publish Artifacts (Archive Layer)'
    needs: 'reasoning'
    runs-on: 'ubuntu-latest'
    if: "github.repository == 'google-gemini/gemini-cli'"
    # The publish phase is for archiving artifacts and optionally creating PRs.
    permissions:
      contents: 'write'
      pull-requests: 'write'
      actions: 'write'
    steps:
      - name: 'Checkout'
        uses: 'actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8' # ratchet:actions/checkout@v5
        with:
          ref: 'main'
          fetch-depth: 0
          persist-credentials: false

      - name: 'Download Brain Data'
        uses: 'actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093' # ratchet:actions/download-artifact@v4
        with:
          name: 'brain-data'
          path: '${{ runner.temp }}/brain-data/'

      - name: 'Create or Update PR'
        if: "${{ github.event.inputs.enable_prs == 'true' }}"
        env:
          GH_TOKEN: '${{ secrets.GEMINI_CLI_ROBOT_GITHUB_PAT }}'
        run: |
          if [ -s "${{ runner.temp }}/brain-data/bot-changes.patch" ]; then
            git config user.name "gemini-cli-robot"
            git config user.email "gemini-cli-robot@google.com"
            git remote set-url origin "https://x-access-token:${GH_TOKEN}@github.com/${{ github.repository }}.git"

            BRANCH_NAME="bot/productivity-updates-$(date +'%Y%m%d%H%M%S')-${{ github.run_id }}"
            if [ -f "${{ runner.temp }}/brain-data/branch-name.txt" ]; then
              BRANCH_NAME=$(cat "${{ runner.temp }}/brain-data/branch-name.txt")
            fi

            # SECURITY: Only allow pushing to branches starting with 'bot/'
            if [[ ! "$BRANCH_NAME" =~ ^bot/ ]]; then
              echo "Error: Branch name '$BRANCH_NAME' does not start with 'bot/'. Safety abort."
              exit 1
            fi

            git checkout -b "$BRANCH_NAME"
            git apply "${{ runner.temp }}/brain-data/bot-changes.patch"
            git add .

            if [ -s "${{ runner.temp }}/brain-data/pr-description.md" ]; then
              git commit -F "${{ runner.temp }}/brain-data/pr-description.md"
            else
              git commit -m "🤖 Gemini Bot Productivity Optimizations"
            fi

            # Use force to update existing PR branches
            git push origin "$BRANCH_NAME" --force

            PR_TITLE="🤖 Gemini Bot Productivity Optimizations"
            if [ -s "${{ runner.temp }}/brain-data/pr-description.md" ]; then
              PR_TITLE=$(head -n 1 "${{ runner.temp }}/brain-data/pr-description.md")
            fi

            # Create PR if it doesn't exist
            if ! gh pr view "$BRANCH_NAME" > /dev/null 2>&1; then
              gh pr create --draft --title "$PR_TITLE" --body-file "${{ runner.temp }}/brain-data/pr-description.md" --head "$BRANCH_NAME" --base main || \
              gh pr create --draft --title "🤖 Gemini Bot Productivity Optimizations" --body "Automated changes generated by Gemini CLI Bot." --head "$BRANCH_NAME" --base main
            fi
          fi

      - name: 'Post PR Comment'
        if: "${{ github.event.inputs.enable_prs == 'true' }}"
        env:
          GH_TOKEN: '${{ secrets.GEMINI_CLI_ROBOT_GITHUB_PAT }}'
        run: |
          if [ -s "${{ runner.temp }}/brain-data/pr-comment.md" ] && [ -f "${{ runner.temp }}/brain-data/pr-number.txt" ]; then
            PR_NUM=$(cat "${{ runner.temp }}/brain-data/pr-number.txt")

            # SECURITY: Only allow commenting on PRs authored by the bot
            PR_AUTHOR=$(gh pr view "$PR_NUM" --json author --jq '.author.login')
            if [ "$PR_AUTHOR" != "gemini-cli-robot" ]; then
              echo "Error: PR #$PR_NUM is authored by '$PR_AUTHOR', not 'gemini-cli-robot'. Safety abort."
              exit 1
            fi

            gh pr comment "$PR_NUM" -F "${{ runner.temp }}/brain-data/pr-comment.md"
          fi