GitHub Actions CI/CD: Zero-downtime deploymenty, které skutečně fungují

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]
  schedule:
    - cron: "0 6 * * 1" # Každé pondělí v 6:00 UTC
  workflow_dispatch:
    inputs:
      environment:
        description: "Target environment"
        required: true
        default: "staging"
        type: choice
        options:
          - staging
          - production

jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: pnpm/action-setup@v4
      - uses: actions/setup-node@v4
        with:
          node-version: 22
          cache: "pnpm"
      - run: pnpm install --frozen-lockfile
      - run: pnpm lint

env:
  NODE_ENV: production
  NEXT_TELEMETRY_DISABLED: 1
 
jobs:
  deploy:
    runs-on: ubuntu-latest
    environment: production
    steps:
      - name: Deploy
        env:
          SSH_PRIVATE_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
          DEPLOY_HOST: ${{ secrets.DEPLOY_HOST }}
        run: |
          echo "$SSH_PRIVATE_KEY" > key.pem
          chmod 600 key.pem
          ssh -i key.pem deploy@$DEPLOY_HOST "cd /var/www/app && ./deploy.sh"

name: CI
 
on:
  pull_request:
    branches: [main]
  push:
    branches: [main]
 
concurrency:
  group: ci-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  lint:
    name: Lint
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: pnpm/action-setup@v4
      - uses: actions/setup-node@v4
        with:
          node-version: 22
          cache: "pnpm"
      - run: pnpm install --frozen-lockfile
      - run: pnpm lint
 
  typecheck:
    name: Type Check
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: pnpm/action-setup@v4
      - uses: actions/setup-node@v4
        with:
          node-version: 22
          cache: "pnpm"
      - run: pnpm install --frozen-lockfile
      - run: pnpm tsc --noEmit
 
  test:
    name: Unit Tests
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: pnpm/action-setup@v4
      - uses: actions/setup-node@v4
        with:
          node-version: 22
          cache: "pnpm"
      - run: pnpm install --frozen-lockfile
      - run: pnpm test -- --coverage
      - uses: actions/upload-artifact@v4
        if: always()
        with:
          name: coverage-report
          path: coverage/
          retention-days: 7
 
  build:
    name: Build
    needs: [lint, typecheck, test]
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: pnpm/action-setup@v4
      - uses: actions/setup-node@v4
        with:
          node-version: 22
          cache: "pnpm"
      - run: pnpm install --frozen-lockfile
      - run: pnpm build
      - uses: actions/upload-artifact@v4
        with:
          name: build-output
          path: .next/
          retention-days: 1

test:
  strategy:
    fail-fast: false
    matrix:
      node-version: [20, 22]
  runs-on: ubuntu-latest
  steps:
    - uses: actions/checkout@v4
    - uses: pnpm/action-setup@v4
    - uses: actions/setup-node@v4
      with:
        node-version: ${{ matrix.node-version }}
        cache: "pnpm"
    - run: pnpm install --frozen-lockfile
    - run: pnpm test

- uses: actions/setup-node@v4
  with:
    node-version: 22
    cache: "pnpm"

- uses: actions/cache@v4
  with:
    path: |
      ~/.local/share/pnpm/store
      node_modules
    key: pnpm-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}
    restore-keys: |
      pnpm-${{ runner.os }}-

- uses: actions/cache@v4
  with:
    path: .next/cache
    key: nextjs-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}-${{ hashFiles('src/**/*.ts', 'src/**/*.tsx') }}
    restore-keys: |
      nextjs-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}-
      nextjs-${{ runner.os }}-

- uses: docker/build-push-action@v6
  with:
    context: .
    push: true
    tags: ghcr.io/${{ github.repository }}:latest
    cache-from: type=gha
    cache-to: type=gha,mode=max

- run: pnpm turbo build --remote-only
  env:
    TURBO_TOKEN: ${{ secrets.TURBO_TOKEN }}
    TURBO_TEAM: ${{ vars.TURBO_TEAM }}

# Fáze 1: Závislosti
FROM node:22-alpine AS deps
RUN corepack enable && corepack prepare pnpm@latest --activate
WORKDIR /app
COPY package.json pnpm-lock.yaml ./
RUN pnpm install --frozen-lockfile --prod=false
 
# Fáze 2: Build
FROM node:22-alpine AS builder
RUN corepack enable && corepack prepare pnpm@latest --activate
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
ENV NEXT_TELEMETRY_DISABLED=1
RUN pnpm build
 
# Fáze 3: Produkce
FROM node:22-alpine AS runner
WORKDIR /app
ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1
 
RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs
 
COPY --from=builder /app/public ./public
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
 
USER nextjs
EXPOSE 3000
ENV PORT=3000
CMD ["node", "server.js"]

name: Build and Push Docker Image
 
on:
  push:
    branches: [main]
 
env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}
 
jobs:
  build-and-push:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
 
    steps:
      - name: Checkout
        uses: actions/checkout@v4
 
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3
 
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
 
      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
 
      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=sha,prefix=
            type=ref,event=branch
            type=raw,value=latest,enable={{is_default_branch}}
 
      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

platforms: linux/amd64,linux/arm64

tags: |
  type=sha,prefix=
  type=ref,event=branch
  type=raw,value=latest,enable={{is_default_branch}}

deploy:
  name: Deploy to Production
  needs: [build-and-push]
  runs-on: ubuntu-latest
  environment: production
 
  steps:
    - name: Deploy via SSH
      uses: appleboy/ssh-action@v1
      with:
        host: ${{ secrets.DEPLOY_HOST }}
        username: ${{ secrets.DEPLOY_USER }}
        key: ${{ secrets.SSH_PRIVATE_KEY }}
        port: ${{ secrets.SSH_PORT }}
        script_stop: true
        script: |
          set -euo pipefail
 
          APP_DIR="/var/www/example.com"
          IMAGE="ghcr.io/${{ github.repository }}:latest"
          DEPLOY_SHA="${{ github.sha }}"
 
          echo "=== Nasazování $DEPLOY_SHA ==="
 
          # Stáhnout nejnovější image
          docker pull "$IMAGE"
 
          # Zastavit a odebrat starý kontejner
          docker stop myapp || true
          docker rm myapp || true
 
          # Spustit nový kontejner
          docker run -d \
            --name myapp \
            --restart unless-stopped \
            --network host \
            -e NODE_ENV=production \
            -e DATABASE_URL="${DATABASE_URL}" \
            -p 3000:3000 \
            "$IMAGE"
 
          # Čekat na health check
          echo "Čekám na health check..."
          for i in $(seq 1 30); do
            if curl -sf http://localhost:3000/api/health > /dev/null 2>&1; then
              echo "Health check prošel při pokusu $i"
              break
            fi
            if [ "$i" -eq 30 ]; then
              echo "Health check selhal po 30 pokusech"
              exit 1
            fi
            sleep 2
          done
 
          # Zaznamenat nasazené SHA
          echo "$DEPLOY_SHA" > "$APP_DIR/.deployed-sha"
 
          # Vyčistit staré image
          docker image prune -af --filter "until=168h"
 
          echo "=== Nasazení dokončeno ==="

#!/bin/bash
# /var/www/example.com/deploy.sh
set -euo pipefail
 
APP_DIR="/var/www/example.com"
LOG_FILE="$APP_DIR/deploy.log"
IMAGE="ghcr.io/myorg/myapp:latest"
 
log() {
  echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*" | tee -a "$LOG_FILE"
}
 
log "Zahajuji nasazení..."
 
# Přihlášení do GHCR
echo "$GHCR_TOKEN" | docker login ghcr.io -u myorg --password-stdin
 
# Stažení s opakováním
for attempt in 1 2 3; do
  if docker pull "$IMAGE"; then
    log "Image úspěšně stažen při pokusu $attempt"
    break
  fi
  if [ "$attempt" -eq 3 ]; then
    log "CHYBA: Nepodařilo se stáhnout image po 3 pokusech"
    exit 1
  fi
  log "Pokus o stažení $attempt selhal, opakuji za 5s..."
  sleep 5
done
 
# Funkce health checku
health_check() {
  local port=$1
  local max_attempts=30
  for i in $(seq 1 $max_attempts); do
    if curl -sf "http://localhost:$port/api/health" > /dev/null 2>&1; then
      return 0
    fi
    sleep 2
  done
  return 1
}
 
# Spustit nový kontejner na alternativním portu
docker run -d \
  --name myapp-new \
  --env-file "$APP_DIR/.env.production" \
  -p 3001:3000 \
  "$IMAGE"
 
# Ověřit, že nový kontejner je zdravý
if ! health_check 3001; then
  log "CHYBA: Nový kontejner neprošel health checkem. Vracím zpět."
  docker stop myapp-new || true
  docker rm myapp-new || true
  exit 1
fi
 
log "Nový kontejner je zdravý. Přepínám provoz..."
 
# Přepnout Nginx upstream
sudo sed -i 's/server 127.0.0.1:3000/server 127.0.0.1:3001/' /etc/nginx/conf.d/upstream.conf
sudo nginx -t && sudo nginx -s reload
 
# Zastavit starý kontejner
docker stop myapp || true
docker rm myapp || true
 
# Přejmenovat nový kontejner
docker rename myapp-new myapp
 
log "Nasazení dokončeno."

script: |
  cd /var/www/example.com && ./deploy.sh

# ecosystem.config.js už obsahuje:
#   instances: 2
#   exec_mode: "cluster"
 
pm2 reload myapp --update-env

- name: Deploy and reload PM2
  uses: appleboy/ssh-action@v1
  with:
    host: ${{ secrets.DEPLOY_HOST }}
    username: ${{ secrets.DEPLOY_USER }}
    key: ${{ secrets.SSH_PRIVATE_KEY }}
    script: |
      cd /var/www/example.com
      git pull origin main
      pnpm install --frozen-lockfile
      pnpm build
      pm2 reload ecosystem.config.js --update-env

# /etc/nginx/conf.d/upstream.conf
upstream app_backend {
    server 127.0.0.1:3000;
}

# /etc/nginx/sites-available/example.com
server {
    listen 443 ssl http2;
    server_name example.com;
 
    location / {
        proxy_pass http://app_backend;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_cache_bypass $http_upgrade;
    }
}

#!/bin/bash
set -euo pipefail
 
CURRENT_PORT=$(grep -oP 'server 127\.0\.0\.1:\K\d+' /etc/nginx/conf.d/upstream.conf)
 
if [ "$CURRENT_PORT" = "3000" ]; then
  NEW_PORT=3001
  OLD_PORT=3000
else
  NEW_PORT=3000
  OLD_PORT=3001
fi
 
echo "Aktuální: $OLD_PORT -> Nový: $NEW_PORT"
 
# Spustit nový kontejner na alternativním portu
docker run -d \
  --name "myapp-$NEW_PORT" \
  --env-file /var/www/example.com/.env.production \
  -p "$NEW_PORT:3000" \
  "ghcr.io/myorg/myapp:latest"
 
# Čekat na health check
for i in $(seq 1 30); do
  if curl -sf "http://localhost:$NEW_PORT/api/health" > /dev/null; then
    echo "Nový kontejner zdravý na portu $NEW_PORT"
    break
  fi
  [ "$i" -eq 30 ] && { echo "Health check selhal"; docker stop "myapp-$NEW_PORT"; docker rm "myapp-$NEW_PORT"; exit 1; }
  sleep 2
done
 
# Přepnout Nginx
sudo sed -i "s/server 127.0.0.1:$OLD_PORT/server 127.0.0.1:$NEW_PORT/" /etc/nginx/conf.d/upstream.conf
sudo nginx -t && sudo nginx -s reload
 
# Zastavit starý kontejner
sleep 5  # Nechat dokončit probíhající požadavky
docker stop "myapp-$OLD_PORT" || true
docker rm "myapp-$OLD_PORT" || true
 
echo "Přepnuto z :$OLD_PORT na :$NEW_PORT"

# docker-compose.yml
services:
  app:
    image: ghcr.io/myorg/myapp:latest
    restart: unless-stopped
    env_file: .env.production
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:3000/api/health"]
      interval: 10s
      timeout: 5s
      retries: 3
      start_period: 30s
    deploy:
      replicas: 2
      update_config:
        parallelism: 1
        delay: 10s
        order: start-first
        failure_action: rollback
      rollback_config:
        parallelism: 0
        order: stop-first
    ports:
      - "3000:3000"

docker compose pull
docker compose up -d --remove-orphans

# Nastavení přes GitHub UI: Settings > Secrets and variables > Actions
 
steps:
  - name: Use a secret
    env:
      DB_URL: ${{ secrets.DATABASE_URL }}
    run: |
      # Hodnota je maskována v logách
      echo "Připojuji se k databázi..."
      # Toto by vytisklo "Připojuji se k ***" v logách
      echo "Připojuji se k $DB_URL"

jobs:
  deploy-staging:
    environment: staging
    steps:
      - run: echo "Nasazuji na ${{ secrets.DEPLOY_HOST }}"
      # DEPLOY_HOST = staging.example.com
 
  deploy-production:
    environment: production
    steps:
      - run: echo "Nasazuji na ${{ secrets.DEPLOY_HOST }}"
      # DEPLOY_HOST = example.com

jobs:
  deploy:
    runs-on: ubuntu-latest
    permissions:
      id-token: write # Vyžadováno pro OIDC
      contents: read
 
    steps:
      - name: Configure AWS Credentials
        uses: aws-actions/configure-aws-credentials@v4
        with:
          role-to-assume: arn:aws:iam::123456789012:role/github-actions-deploy
          aws-region: eu-central-1
 
      - name: Push to ECR
        run: |
          aws ecr get-login-password --region eu-central-1 | \
            docker login --username AWS --password-stdin 123456789012.dkr.ecr.eu-central-1.amazonaws.com

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Federated": "arn:aws:iam::123456789012:oidc-provider/token.actions.githubusercontent.com"
      },
      "Action": "sts:AssumeRoleWithWebIdentity",
      "Condition": {
        "StringEquals": {
          "token.actions.githubusercontent.com:aud": "sts.amazonaws.com"
        },
        "StringLike": {
          "token.actions.githubusercontent.com:sub": "repo:myorg/myapp:ref:refs/heads/main"
        }
      }
    }
  ]
}

ssh-keygen -t ed25519 -C "github-actions-deploy" -f deploy_key -N ""

name: Preview Deploy
 
on:
  pull_request:
    types: [opened, synchronize, reopened]
 
jobs:
  preview:
    runs-on: ubuntu-latest
    environment:
      name: preview-${{ github.event.number }}
      url: ${{ steps.deploy.outputs.url }}
 
    steps:
      - uses: actions/checkout@v4
 
      - name: Build preview image
        uses: docker/build-push-action@v6
        with:
          context: .
          push: true
          tags: ghcr.io/${{ github.repository }}:pr-${{ github.event.number }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
 
      - name: Deploy preview
        id: deploy
        uses: appleboy/ssh-action@v1
        with:
          host: ${{ secrets.PREVIEW_HOST }}
          username: ${{ secrets.DEPLOY_USER }}
          key: ${{ secrets.SSH_PRIVATE_KEY }}
          script: |
            PR_NUM=${{ github.event.number }}
            PORT=$((4000 + PR_NUM))
            IMAGE="ghcr.io/${{ github.repository }}:pr-${PR_NUM}"
 
            docker pull "$IMAGE"
            docker stop "preview-${PR_NUM}" || true
            docker rm "preview-${PR_NUM}" || true
 
            docker run -d \
              --name "preview-${PR_NUM}" \
              --restart unless-stopped \
              -e NODE_ENV=preview \
              -p "${PORT}:3000" \
              "$IMAGE"
 
            echo "url=https://pr-${PR_NUM}.preview.example.com" >> "$GITHUB_OUTPUT"
 
      - name: Comment PR with preview URL
        uses: actions/github-script@v7
        with:
          script: |
            const url = `https://pr-${{ github.event.number }}.preview.example.com`;
            const body = `### Preview Deployment
 
            | Status | URL |
            |--------|-----|
            | :white_check_mark: Deployed | [${url}](${url}) |
 
            _Last updated: ${new Date().toISOString()}_
            _Commit: \`${{ github.sha }}\`_`;
 
            // Najít existující komentář
            const comments = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
            });
 
            const botComment = comments.data.find(c =>
              c.user.type === 'Bot' && c.body.includes('Preview Deployment')
            );
 
            if (botComment) {
              await github.rest.issues.updateComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: botComment.id,
                body,
              });
            } else {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                body,
              });
            }

name: Cleanup Preview
 
on:
  pull_request:
    types: [closed]
 
jobs:
  cleanup:
    runs-on: ubuntu-latest
    steps:
      - name: Remove preview container
        uses: appleboy/ssh-action@v1
        with:
          host: ${{ secrets.PREVIEW_HOST }}
          username: ${{ secrets.DEPLOY_USER }}
          key: ${{ secrets.SSH_PRIVATE_KEY }}
          script: |
            PR_NUM=${{ github.event.number }}
            docker stop "preview-${PR_NUM}" || true
            docker rm "preview-${PR_NUM}" || true
            docker rmi "ghcr.io/${{ github.repository }}:pr-${PR_NUM}" || true
            echo "Preview pro PR #${PR_NUM} uklizeno."
 
      - name: Deactivate environment
        uses: actions/github-script@v7
        with:
          script: |
            const deployments = await github.rest.repos.listDeployments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              environment: `preview-${{ github.event.number }}`,
            });
 
            for (const deployment of deployments.data) {
              await github.rest.repos.createDeploymentStatus({
                owner: context.repo.owner,
                repo: context.repo.repo,
                deployment_id: deployment.id,
                state: 'inactive',
              });
            }

- name: Notify Slack
  if: always()
  uses: slackapi/slack-github-action@v2
  with:
    webhook: ${{ secrets.SLACK_DEPLOY_WEBHOOK }}
    webhook-type: incoming-webhook
    payload: |
      {
        "blocks": [
          {
            "type": "header",
            "text": {
              "type": "plain_text",
              "text": "${{ job.status == 'success' && 'Deploy Successful' || 'Deploy Failed' }}"
            }
          },
          {
            "type": "section",
            "fields": [
              {
                "type": "mrkdwn",
                "text": "*Repository:*\n${{ github.repository }}"
              },
              {
                "type": "mrkdwn",
                "text": "*Branch:*\n${{ github.ref_name }}"
              },
              {
                "type": "mrkdwn",
                "text": "*Commit:*\n<${{ github.server_url }}/${{ github.repository }}/commit/${{ github.sha }}|${{ github.sha }}>"
              },
              {
                "type": "mrkdwn",
                "text": "*Triggered by:*\n${{ github.actor }}"
              }
            ]
          },
          {
            "type": "actions",
            "elements": [
              {
                "type": "button",
                "text": {
                  "type": "plain_text",
                  "text": "View Run"
                },
                "url": "${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"
              }
            ]
          }
        ]
      }

- name: Create GitHub Deployment
  id: deployment
  uses: actions/github-script@v7
  with:
    script: |
      const deployment = await github.rest.repos.createDeployment({
        owner: context.repo.owner,
        repo: context.repo.repo,
        ref: context.sha,
        environment: 'production',
        auto_merge: false,
        required_contexts: [],
        description: `Nasazuji ${context.sha.substring(0, 7)} na produkci`,
      });
      return deployment.data.id;
 
- name: Deploy
  run: |
    # ... samotné kroky nasazení ...
 
- name: Update deployment status
  if: always()
  uses: actions/github-script@v7
  with:
    script: |
      const deploymentId = ${{ steps.deployment.outputs.result }};
      await github.rest.repos.createDeploymentStatus({
        owner: context.repo.owner,
        repo: context.repo.repo,
        deployment_id: deploymentId,
        state: '${{ job.status }}' === 'success' ? 'success' : 'failure',
        environment_url: 'https://example.com',
        log_url: `${context.serverUrl}/${context.repo.owner}/${context.repo.repo}/actions/runs/${context.runId}`,
        description: '${{ job.status }}' === 'success'
          ? 'Nasazení úspěšné'
          : 'Nasazení selhalo',
      });

- name: Alert on failure
  if: failure()
  run: |
    curl -X POST "${{ secrets.ALERT_WEBHOOK_URL }}" \
      -H "Content-Type: application/json" \
      -d '{
        "subject": "NASAZENÍ SELHALO: ${{ github.repository }}",
        "body": "Commit: ${{ github.sha }}\nActor: ${{ github.actor }}\nRun: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"
      }'

name: CI/CD Pipeline
 
on:
  push:
    branches: [main]
  pull_request:
    branches: [main]
  workflow_dispatch:
    inputs:
      skip_tests:
        description: "Skip tests (emergency deploy)"
        required: false
        type: boolean
        default: false
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 
env:
  NODE_VERSION: "22"
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}
 
jobs:
  # ============================================================
  # CI: Lint, typová kontrola a testy paralelně
  # ============================================================
 
  lint:
    name: Lint
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
 
      - name: Setup pnpm
        uses: pnpm/action-setup@v4
 
      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: "pnpm"
 
      - name: Install dependencies
        run: pnpm install --frozen-lockfile
 
      - name: Run ESLint
        run: pnpm lint
 
  typecheck:
    name: Type Check
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
 
      - name: Setup pnpm
        uses: pnpm/action-setup@v4
 
      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: "pnpm"
 
      - name: Install dependencies
        run: pnpm install --frozen-lockfile
 
      - name: Run TypeScript compiler
        run: pnpm tsc --noEmit
 
  test:
    name: Unit Tests
    if: ${{ !inputs.skip_tests }}
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
 
      - name: Setup pnpm
        uses: pnpm/action-setup@v4
 
      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: "pnpm"
 
      - name: Install dependencies
        run: pnpm install --frozen-lockfile
 
      - name: Run tests with coverage
        run: pnpm test -- --coverage
 
      - name: Upload coverage report
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: coverage-report
          path: coverage/
          retention-days: 7
 
  # ============================================================
  # Build: Pouze po úspěšném CI
  # ============================================================
 
  build:
    name: Build Application
    needs: [lint, typecheck, test]
    if: always() && !cancelled() && needs.lint.result == 'success' && needs.typecheck.result == 'success' && (needs.test.result == 'success' || needs.test.result == 'skipped')
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
 
      - name: Setup pnpm
        uses: pnpm/action-setup@v4
 
      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: "pnpm"
 
      - name: Install dependencies
        run: pnpm install --frozen-lockfile
 
      - name: Cache Next.js build
        uses: actions/cache@v4
        with:
          path: .next/cache
          key: nextjs-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}-${{ hashFiles('src/**/*.ts', 'src/**/*.tsx') }}
          restore-keys: |
            nextjs-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}-
            nextjs-${{ runner.os }}-
 
      - name: Build Next.js application
        run: pnpm build
 
  # ============================================================
  # Docker: Build a push image (pouze main větev)
  # ============================================================
 
  docker:
    name: Build Docker Image
    needs: [build]
    if: github.ref == 'refs/heads/main' && github.event_name != 'pull_request'
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    outputs:
      image_tag: ${{ steps.meta.outputs.tags }}
 
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
 
      - name: Set up QEMU for multi-platform builds
        uses: docker/setup-qemu-action@v3
 
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
 
      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
 
      - name: Extract image metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=sha,prefix=
            type=raw,value=latest,enable={{is_default_branch}}
 
      - name: Build and push Docker image
        uses: docker/build-push-action@v6
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
 
  # ============================================================
  # Deploy: SSH na VPS a aktualizace
  # ============================================================
 
  deploy:
    name: Deploy to Production
    needs: [docker]
    if: github.ref == 'refs/heads/main' && github.event_name != 'pull_request'
    runs-on: ubuntu-latest
    environment:
      name: production
      url: https://example.com
 
    steps:
      - name: Create GitHub Deployment
        id: deployment
        uses: actions/github-script@v7
        with:
          script: |
            const deployment = await github.rest.repos.createDeployment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              ref: context.sha,
              environment: 'production',
              auto_merge: false,
              required_contexts: [],
              description: `Deploy ${context.sha.substring(0, 7)}`,
            });
            return deployment.data.id;
 
      - name: Deploy via SSH
        uses: appleboy/ssh-action@v1
        with:
          host: ${{ secrets.DEPLOY_HOST }}
          username: ${{ secrets.DEPLOY_USER }}
          key: ${{ secrets.SSH_PRIVATE_KEY }}
          port: ${{ secrets.SSH_PORT }}
          script_stop: true
          command_timeout: 5m
          script: |
            set -euo pipefail
 
            APP_DIR="/var/www/example.com"
            IMAGE="ghcr.io/${{ github.repository }}:latest"
            SHA="${{ github.sha }}"
 
            echo "=== Deploy $SHA zahájen $(date) ==="
 
            # Stáhnout nový image
            docker pull "$IMAGE"
 
            # Spustit nový kontejner na alternativním portu
            docker run -d \
              --name myapp-new \
              --env-file "$APP_DIR/.env.production" \
              -p 3001:3000 \
              "$IMAGE"
 
            # Health check
            echo "Spouštím health check..."
            for i in $(seq 1 30); do
              if curl -sf http://localhost:3001/api/health > /dev/null 2>&1; then
                echo "Health check prošel (pokus $i)"
                break
              fi
              if [ "$i" -eq 30 ]; then
                echo "CHYBA: Health check selhal"
                docker logs myapp-new --tail 50
                docker stop myapp-new && docker rm myapp-new
                exit 1
              fi
              sleep 2
            done
 
            # Přepnout provoz
            sudo sed -i 's/server 127.0.0.1:3000/server 127.0.0.1:3001/' /etc/nginx/conf.d/upstream.conf
            sudo nginx -t && sudo nginx -s reload
 
            # Čas odkladu pro probíhající požadavky
            sleep 5
 
            # Zastavit starý kontejner
            docker stop myapp || true
            docker rm myapp || true
 
            # Přejmenovat a resetovat port
            docker rename myapp-new myapp
            sudo sed -i 's/server 127.0.0.1:3001/server 127.0.0.1:3000/' /etc/nginx/conf.d/upstream.conf
            # Poznámka: Nginx tady nerelodujeme, protože se změnil název kontejneru,
            # ne port. Příští deploy použije správný port.
 
            # Zaznamenat nasazení
            echo "$SHA" > "$APP_DIR/.deployed-sha"
            echo "$(date -u +%Y-%m-%dT%H:%M:%SZ) $SHA" >> "$APP_DIR/deploy.log"
 
            # Vyčistit staré image (starší než 7 dní)
            docker image prune -af --filter "until=168h"
 
            echo "=== Deploy dokončen $(date) ==="
 
      - name: Update deployment status
        if: always()
        uses: actions/github-script@v7
        with:
          script: |
            const deploymentId = ${{ steps.deployment.outputs.result }};
            await github.rest.repos.createDeploymentStatus({
              owner: context.repo.owner,
              repo: context.repo.repo,
              deployment_id: deploymentId,
              state: '${{ job.status }}' === 'success' ? 'success' : 'failure',
              environment_url: 'https://example.com',
              log_url: `${context.serverUrl}/${context.repo.owner}/${context.repo.repo}/actions/runs/${context.runId}`,
            });
 
      - name: Notify Slack
        if: always()
        uses: slackapi/slack-github-action@v2
        with:
          webhook: ${{ secrets.SLACK_DEPLOY_WEBHOOK }}
          webhook-type: incoming-webhook
          payload: |
            {
              "blocks": [
                {
                  "type": "header",
                  "text": {
                    "type": "plain_text",
                    "text": "${{ job.status == 'success' && 'Deploy Successful' || 'Deploy Failed' }}"
                  }
                },
                {
                  "type": "section",
                  "fields": [
                    {
                      "type": "mrkdwn",
                      "text": "*Commit:*\n<${{ github.server_url }}/${{ github.repository }}/commit/${{ github.sha }}|`${{ github.sha }}`>"
                    },
                    {
                      "type": "mrkdwn",
                      "text": "*Actor:*\n${{ github.actor }}"
                    }
                  ]
                },
                {
                  "type": "actions",
                  "elements": [
                    {
                      "type": "button",
                      "text": { "type": "plain_text", "text": "View Run" },
                      "url": "${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"
                    }
                  ]
                }
              ]
            }
 
      - name: Alert on failure
        if: failure()
        run: |
          curl -sf -X POST "${{ secrets.ALERT_WEBHOOK_URL }}" \
            -H "Content-Type: application/json" \
            -d '{
              "subject": "NASAZENÍ SELHALO: ${{ github.repository }}",
              "body": "Commit: ${{ github.sha }}\nRun: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"
            }' || true

jobs:
  deploy:
    timeout-minutes: 15
    runs-on: ubuntu-latest