name: StackFlow (Plan/Validate)

on:
  workflow_dispatch:
    inputs:
      config:
        description: "Path to StackFlow config (e.g. StackFlow/svc-plus.yaml)"
        required: true
        type: string
        default: "StackFlow/svc-plus.yaml"
      phase:
        description: "Phase to run"
        required: true
        type: choice
        options:
          - validate
          - dns-plan
  pull_request:
    paths:
      - "StackFlow/**/*.yml"
      - "StackFlow/**/*.yaml"
      - "stackflow/**/*.yml"
      - "stackflow/**/*.yaml"
      - ".github/workflows/stackflow.yaml"
      - "scripts/stackflow/**"
  push:
    branches:
      - main
    paths:
      - "StackFlow/**/*.yml"
      - "StackFlow/**/*.yaml"
      - "stackflow/**/*.yml"
      - "stackflow/**/*.yaml"
      - ".github/workflows/stackflow.yaml"
      - "scripts/stackflow/**"

jobs:
  resolve-configs:
    runs-on: ubuntu-latest
    outputs:
      configs: ${{ steps.set.outputs.configs }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Resolve config list
        id: set
        shell: bash
        run: |
          set -euo pipefail

          if [[ "${{ github.event_name }}" == "workflow_dispatch" ]]; then
            python - <<'PY' >> "$GITHUB_OUTPUT"
import json
print("configs=" + json.dumps(["${{ inputs.config }}"]))
PY
            exit 0
          fi

          if [[ "${{ github.event_name }}" == "pull_request" ]]; then
            git fetch origin "${{ github.base_ref }}" --depth=1
            files="$(git diff --name-only "origin/${{ github.base_ref }}"...HEAD || true)"
          else
            # push
            files="$(git diff --name-only "${{ github.event.before }}" "${{ github.sha }}" || true)"
          fi

          configs="$(printf '%s\n' "$files" | grep -E '^(StackFlow|stackflow)/.*\.ya?ml$' || true)"
          if [[ -z "${configs}" ]]; then
            if [[ -f "stackflow/svc.plus.yaml" ]]; then
              configs="stackflow/svc.plus.yaml"
            else
              configs="StackFlow/svc-plus.yaml"
            fi
          fi

          printf '%s\n' "$configs" | python - <<'PY' >> "$GITHUB_OUTPUT"
import json, sys
configs = [l.strip() for l in sys.stdin.read().splitlines() if l.strip()]
print("configs=" + json.dumps(configs))
PY

  stackflow:
    runs-on: ubuntu-latest
    needs: resolve-configs
    concurrency:
      group: stackflow-${{ github.ref }}
      cancel-in-progress: true
    strategy:
      fail-fast: false
      matrix:
        config: ${{ fromJson(needs.resolve-configs.outputs.configs) }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Setup Python
        uses: actions/setup-python@v5
        with:
          python-version: "3.11"

      - name: Install deps
        run: |
          python -m pip install --upgrade pip
          python -m pip install -r scripts/stackflow/requirements.txt

      - name: Prepare output dir
        shell: bash
        run: |
          set -euo pipefail
          mkdir -p out

      - name: Run StackFlow (workflow_dispatch)
        if: ${{ github.event_name == 'workflow_dispatch' }}
        run: |
          python scripts/stackflow/runner.py \
            --config "${{ inputs.config }}" \
            --phase "${{ inputs.phase }}"

      - name: Validate (CI)
        if: ${{ github.event_name != 'workflow_dispatch' }}
        run: |
          python scripts/stackflow/runner.py \
            --config "${{ matrix.config }}" \
            --phase validate \
            > "out/$(basename "${{ matrix.config }}").validate.json"

      - name: DNS Plan (CI)
        if: ${{ github.event_name != 'workflow_dispatch' }}
        run: |
          python scripts/stackflow/runner.py \
            --config "${{ matrix.config }}" \
            --phase dns-plan \
            > "out/$(basename "${{ matrix.config }}").dns-plan.json"

      - name: Compute artifact name (CI)
        if: ${{ github.event_name != 'workflow_dispatch' }}
        shell: bash
        run: |
          set -euo pipefail
          name="${{ matrix.config }}"
          name="${name//\//-}"
          echo "ARTIFACT_NAME=stackflow-${name}" >> "$GITHUB_ENV"

      - name: Upload artifacts (CI)
        if: ${{ github.event_name != 'workflow_dispatch' }}
        uses: actions/upload-artifact@v4
        with:
          name: ${{ env.ARTIFACT_NAME }}
          path: out/