name: Deploy to production

on:
  push:
    branches:
      - main

jobs:
  deploy:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 2

      - name: Detect vocab course changes
        id: vocab_course_changes
        shell: bash
        run: |
          set -euo pipefail

          BASE="${{ gitea.event.before }}"
          HEAD="${{ gitea.sha }}"

          if [ -z "$BASE" ] || [[ "$BASE" =~ ^0+$ ]] || ! git cat-file -e "$BASE^{commit}" 2>/dev/null; then
            BASE="HEAD~1"
          fi

          git diff --name-only "$BASE" "$HEAD" > changed-files.txt
          cat changed-files.txt
          COMMIT_MESSAGE="$(git log -1 --pretty=%B "$HEAD" || true)"

          if echo "$COMMIT_MESSAGE" | grep -qi '\[force-deploy\]'; then
            echo "force_deploy=true" >> "$GITHUB_OUTPUT"
          else
            echo "force_deploy=false" >> "$GITHUB_OUTPUT"
          fi

          if grep -E '^(backend/scripts/.*(bisaya|course|didactics|vocab)|backend/sql/.*vocab|backend/migrations/.*vocab|docs/.*(COURSE|VOCAB|BISAYA|GERMAN_FOR_BISAYA))' changed-files.txt; then
            echo "changed=true" >> "$GITHUB_OUTPUT"
          else
            echo "changed=false" >> "$GITHUB_OUTPUT"
          fi

          if grep -E '^frontend/' changed-files.txt >/dev/null; then
            echo "frontend_changed=true" >> "$GITHUB_OUTPUT"
          else
            echo "frontend_changed=false" >> "$GITHUB_OUTPUT"
          fi

          if grep -E '^backend/' changed-files.txt \
            | grep -Ev '^(backend/scripts/.*(bisaya|course|didactics|vocab)|backend/sql/.*vocab|backend/migrations/.*vocab)$' >/dev/null; then
            echo "backend_app_changed=true" >> "$GITHUB_OUTPUT"
          else
            echo "backend_app_changed=false" >> "$GITHUB_OUTPUT"
          fi

          # App-Code-Änderungen, die einen echten Deploy benötigen
          # (Frontend oder Backend außerhalb reiner Kurs-/Dokument-Sync-Dateien)
          if grep -E '^(frontend/|backend/)' changed-files.txt \
            | grep -Ev '^(backend/scripts/.*(bisaya|course|didactics|vocab)|backend/sql/.*vocab|backend/migrations/.*vocab|docs/.*(COURSE|VOCAB|BISAYA|GERMAN_FOR_BISAYA))'; then
            echo "app_changed=true" >> "$GITHUB_OUTPUT"
          else
            echo "app_changed=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Prepare SSH
        run: |
          mkdir -p ~/.ssh
          printf "%s" "${{ secrets.PROD_SSH_KEY }}" > ~/.ssh/id_ed25519
          chmod 600 ~/.ssh/id_ed25519
          ssh-keyscan -p "${{ secrets.PROD_PORT }}" "${{ secrets.PROD_HOST }}" >> ~/.ssh/known_hosts

      - name: Test SSH connection
        run: |
          ssh -i ~/.ssh/id_ed25519 \
            -o StrictHostKeyChecking=no \
            -o BatchMode=yes \
            -p "${{ secrets.PROD_PORT }}" \
            "${{ secrets.PROD_USER }}@${{ secrets.PROD_HOST }}" \
            "echo SSH OK"

      - name: Run deployment script
        if: steps.vocab_course_changes.outputs.app_changed == 'true' || steps.vocab_course_changes.outputs.force_deploy == 'true'
        run: |
          DEPLOY_FLAGS=""
          if [ "${{ steps.vocab_course_changes.outputs.force_deploy }}" = "true" ]; then
            DEPLOY_FLAGS=""
          elif [ "${{ steps.vocab_course_changes.outputs.backend_app_changed }}" = "true" ] && [ "${{ steps.vocab_course_changes.outputs.frontend_changed }}" != "true" ]; then
            DEPLOY_FLAGS="--skip-frontend"
          elif [ "${{ steps.vocab_course_changes.outputs.frontend_changed }}" = "true" ] && [ "${{ steps.vocab_course_changes.outputs.backend_app_changed }}" != "true" ]; then
            DEPLOY_FLAGS="--skip-backend"
          fi

          DEPLOY_TARGET="${{ secrets.PROD_DEPLOY_TARGET }}"
          if [ -z "$DEPLOY_TARGET" ]; then
            DEPLOY_TARGET="/opt/yourpart-green"
          fi

          echo "Deploy-Flags: ${DEPLOY_FLAGS:-<none>}"
          echo "Deploy-Target: $DEPLOY_TARGET"

          ssh -i ~/.ssh/id_ed25519 \
            -p "${{ secrets.PROD_PORT }}" \
            "${{ secrets.PROD_USER }}@${{ secrets.PROD_HOST }}" \
            "/home/tsschulz/deploy-yourpart-bluegreen.sh ${DEPLOY_TARGET} ${DEPLOY_FLAGS}"

      - name: Skip full deployment (no app changes)
        if: steps.vocab_course_changes.outputs.app_changed != 'true' && steps.vocab_course_changes.outputs.force_deploy != 'true'
        run: |
          echo "Kein Full-Deploy: Es wurden keine Frontend/Backend-App-Dateien geändert."

      - name: Sync vocab course content
        if: steps.vocab_course_changes.outputs.changed == 'true' || steps.vocab_course_changes.outputs.force_deploy == 'true'
        run: |
          ssh -i ~/.ssh/id_ed25519 \
            -p "${{ secrets.PROD_PORT }}" \
            "${{ secrets.PROD_USER }}@${{ secrets.PROD_HOST }}" \
            "cd /opt/yourpart && npm --prefix backend run sync:vocab-courses"