name: baekjoon-bot-cicd

on:
  push:
    branches: ["main"]
    paths-ignore:
      - "**/*.md"

jobs:
  build_push_deploy:
    runs-on: ubuntu-latest
    steps:
      - name: Setup SSH for Gitea
        env:
          SSH_PRIVATE_KEY: ${{ secrets.NKEY_SSH_PRIVATE_KEY }}
        run: |
          set -euo pipefail

          mkdir -p ~/.ssh
          chmod 700 ~/.ssh

          echo "$SSH_PRIVATE_KEY" > ~/.ssh/id_ed25519
          chmod 600 ~/.ssh/id_ed25519

          ssh-keyscan -p 2222 -t rsa,ed25519 nkeystudy.site >> ~/.ssh/known_hosts
          chmod 644 ~/.ssh/known_hosts

          cat >> ~/.ssh/config <<'EOF'
          Host nkey-gitea
            HostName nkeystudy.site
            User git
            Port 2222
            IdentityFile ~/.ssh/id_ed25519
            IdentitiesOnly yes
          EOF
          chmod 600 ~/.ssh/config

      - name: Manual checkout via SSH
        env:
          REPO: ${{ github.repository }}
          SHA: ${{ github.sha }}
        run: |
          set -euo pipefail

          git init .
          git remote add origin "nkey-gitea:${REPO}.git"
          git fetch --no-tags --prune --depth=1 origin "${SHA}"
          git checkout -q FETCH_HEAD

      - name: Ensure docker compose available
        run: |
          set -euo pipefail
          docker version
          if ! docker compose version >/dev/null 2>&1; then
            sudo apt-get update
            sudo apt-get install -y docker-compose-plugin
          fi
          docker compose version

      - name: Docker login
        env:
          DOCKERHUB_USER: ${{ secrets.DOCKERHUB_USERNAME }}
          DOCKERHUB_TOKEN: ${{ secrets.DOCKERHUB_TOKEN }}
        run: |
          set -euo pipefail
          echo "${DOCKERHUB_TOKEN}" | docker login -u "${DOCKERHUB_USER}" --password-stdin

      - name: Extract image version from commit message
        id: version
        env:
          COMMIT_MESSAGE: ${{ github.event.head_commit.message }}
        run: |
          set -euo pipefail

          VERSION_TAG=""
          if printf '%s' "${COMMIT_MESSAGE}" | grep -Eq '\[[0-9]+\.[0-9]+\.[0-9]+\]'; then
            VERSION_TAG="$(printf '%s' "${COMMIT_MESSAGE}" | sed -nE 's/.*\[([0-9]+\.[0-9]+\.[0-9]+)\].*/\1/p' | head -n1)"
          fi

          echo "version_tag=${VERSION_TAG}" >> "$GITHUB_OUTPUT"

      - name: Build and push image
        env:
          DOCKERHUB_USER: ${{ secrets.DOCKERHUB_USERNAME }}
          IMAGE_NAME: baekjoon-bot
          VERSION_TAG: ${{ steps.version.outputs.version_tag }}
        run: |
          set -euo pipefail

          IMAGE="${DOCKERHUB_USER}/${IMAGE_NAME}:latest"
          if [ -n "${VERSION_TAG}" ]; then
            VERSIONED_IMAGE="${DOCKERHUB_USER}/${IMAGE_NAME}:${VERSION_TAG}"
            docker build -t "${IMAGE}" -t "${VERSIONED_IMAGE}" .
            docker push "${VERSIONED_IMAGE}"
          else
            docker build -t "${IMAGE}" .
          fi

          docker push "${IMAGE}"

      - name: Deploy on server (compose pull/up)
        run: |
          set -euo pipefail
          docker compose -p nkeys-apps -f /nkeysworld/compose.apps.yml pull baekjoon-bot
          docker compose -p nkeys-apps -f /nkeysworld/compose.apps.yml up -d baekjoon-bot
          docker image prune -f

      - name: Discord Notification
        if: always()
        env:
          DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
        run: |
          set -euo pipefail
          if [ "${{ job.status }}" = "success" ]; then
            STATUS="SUCCESS"
            COLOR=3066993
            DESC="Baekjoon bot build/push/deploy succeeded."
          else
            STATUS="FAILURE"
            COLOR=15158332
            DESC="Baekjoon bot build or deploy failed."
          fi

          curl -X POST -H "Content-Type: application/json" \
          -d '{
            "embeds": [{
              "title": "Baekjoon Bot CI/CD - '"$STATUS"'",
              "description": "'"$DESC"'",
              "fields": [
                { "name": "Repo", "value": "${{ github.repository }}", "inline": true },
                { "name": "Commit", "value": "`${{ github.sha }}`", "inline": true },
                { "name": "Actor", "value": "${{ github.actor }}", "inline": true },
                { "name": "Image Version", "value": "`${{ steps.version.outputs.version_tag || 'latest only' }}`", "inline": true }
              ],
              "color": '"$COLOR"',
              "timestamp": "'$(date -u +%Y-%m-%dT%H:%M:%SZ)'"
            }]
          }' "${DISCORD_WEBHOOK}"