version: 2.1

# ──────────────────────────────────────────────────────────────
# OpenCodeHub Worker — CircleCI Cloud Configuration
# For managed CircleCI Cloud (NOT self-hosted runners)
# Uses external PostgreSQL + Redis (required for Cloud)
# ──────────────────────────────────────────────────────────────

orbs:
  # Optional: for better Docker layer caching
  docker: circleci/docker@2.6.0

executors:
  # Docker executor with Bun + Node.js
  bun-medium:
    docker:
      - image: oven/bun:1
    resource_class: medium

  bun-large:
    docker:
      - image: oven/bun:1
    resource_class: large

  # With PostgreSQL service container (for testing, NOT production data)
  bun-with-postgres:
    docker:
      - image: oven/bun:1
      - image: cimg/postgres:16.2
        environment:
          POSTGRES_USER: opencodehub
          POSTGRES_PASSWORD: opencodehub
          POSTGRES_DB: opencodehub
    resource_class: medium

# ── Reusable Commands ─────────────────────────────────────────

commands:
  setup-bun:
    description: "Ensure Bun is installed and available"
    steps:
      - run:
          name: Verify Bun
          command: |
            if ! command -v bun &> /dev/null; then
              echo "Installing Bun..."
              curl -fsSL https://bun.sh/install | bash
              echo 'export PATH="$HOME/.bun/bin:$PATH"' >> $BASH_ENV
            fi
            source $BASH_ENV
            bun --version

  install-deps:
    description: "Install dependencies with retry"
    steps:
      - run:
          name: Install dependencies
          command: |
            for i in 1 2 3; do
              bun install --frozen-lockfile && exit 0
              echo "bun install attempt $i failed, retrying in 10s..."
              sleep 10
            done
            echo "::error::bun install failed after 3 attempts"
            exit 1

  check-env:
    description: "Verify required environment variables"
    steps:
      - run:
          name: Check environment
          command: |
            : "${DATABASE_URL:?DATABASE_URL is required}"
            : "${REDIS_URL:?REDIS_URL is required}"
            : "${JWT_SECRET:?JWT_SECRET is required}"
            : "${SESSION_SECRET:?SESSION_SECRET is required}"
            echo "✅ All required environment variables are set"

# ── Jobs ─────────────────────────────────────────────────────

jobs:
  # ──────────────────────────────────────────────
  # Continuous Worker (up to 5 hours)
  # ──────────────────────────────────────────────
  # NOTE: CircleCI Cloud free plan has 5h job limit.
  # Performance/Scale plans have longer limits.
  # For truly continuous operation, use scheduled pipelines
  # to restart every 4.5 hours, OR use self-hosted runner.
  # ──────────────────────────────────────────────
  worker:
    executor: bun-medium
    environment:
      NODE_ENV: production
      # Worker loop interval (ms)
      WORKER_INTERVAL: 5000
      # Health check port (not exposed externally on Cloud)
      WORKER_HEALTH_PORT: 9090
      # Stale job timeout (ms)
      WORKER_STALE_TIMEOUT: 300000
    steps:
      - checkout
      - setup-bun
      - install-deps
      - check-env

      - run:
          name: Start OpenCodeHub Worker
          command: |
            echo "Starting OpenCodeHub worker..."
            echo "Database: ${DATABASE_URL%%@*}@..."
            echo "Redis: ${REDIS_URL%%@*}@..."
            
            # Run worker
            bun run scripts/worker.ts &
            WORKER_PID=$!
            
            # Wait for it to start
            sleep 5
            
            # Verify it's running
            if kill -0 $WORKER_PID 2>/dev/null; then
              echo "✅ Worker started (PID: $WORKER_PID)"
            else
              echo "❌ Worker failed to start"
              exit 1
            fi
            
            # Keep job alive until timeout
            # CircleCI Cloud will kill the job after the timeout
            wait $WORKER_PID
          # CircleCI Cloud timeouts:
          # Free plan: 1 hour (default), max 5 hours
          # Performance: up to 5 hours
          # Scale: up to 5 hours  
          # Server: configurable
          no_output_timeout: 5h

  # ──────────────────────────────────────────────
  # Merge Queue Processor (short burst)
  # ──────────────────────────────────────────────
  merge-queue:
    executor: bun-medium
    environment:
      NODE_ENV: production
      WORKER_INTERVAL: 5000
      WORKER_STALE_TIMEOUT: 300000
    steps:
      - checkout
      - setup-bun
      - install-deps
      - check-env

      - run:
          name: Process Merge Queue
          command: |
            echo "Processing merge queue..."
            # Run worker for 30 minutes to clear the queue
            timeout 1800 bun run scripts/worker.ts || true
            echo "Merge queue processing complete."
          no_output_timeout: 30m

  # ──────────────────────────────────────────────
  # Mirror Sync
  # ──────────────────────────────────────────────
  mirror-sync:
    executor: bun-medium
    environment:
      NODE_ENV: production
    steps:
      - checkout
      - setup-bun
      - install-deps
      - check-env

      - run:
          name: Sync Mirrors
          command: |
            echo "Starting mirror sync..."
            # Run for up to 1 hour
            timeout 3600 bun run scripts/worker.ts --task=mirror-sync || true
            echo "Mirror sync complete."
          no_output_timeout: 1h

  # ──────────────────────────────────────────────
  # Cleanup Tasks
  # ──────────────────────────────────────────────
  cleanup:
    executor: bun-medium
    environment:
      NODE_ENV: production
    steps:
      - checkout
      - setup-bun
      - install-deps
      - check-env

      - run:
          name: Run Cleanup
          command: |
            echo "Running cleanup tasks..."
            timeout 1800 bun run scripts/worker.ts --task=cleanup || true
            echo "Cleanup complete."
          no_output_timeout: 30m

  # ──────────────────────────────────────────────
  # Health Check (tests DB connectivity)
  # ──────────────────────────────────────────────
  health-check:
    executor: bun-medium
    environment:
      NODE_ENV: production
    steps:
      - checkout
      - setup-bun
      - install-deps
      - check-env

      - run:
          name: Test Database Connection
          command: |
            echo "Testing database connection..."
            bun -e "
              const { getDatabase } = require('./src/db');
              try {
                const db = getDatabase();
                console.log('✅ Database connected successfully');
                process.exit(0);
              } catch (err) {
                console.error('❌ Database connection failed:', err.message);
                process.exit(1);
              }
            "

      - run:
          name: Test Redis Connection
          command: |
            echo "Testing Redis connection..."
            # Quick Redis ping using bun
            bun -e "
              const url = new URL(process.env.REDIS_URL || '');
              const client = require('redis').createClient({ url: process.env.REDIS_URL });
              client.connect()
                .then(() => client.ping())
                .then(() => { console.log('✅ Redis connected'); client.quit(); process.exit(0); })
                .catch((err) => { console.error('❌ Redis failed:', err.message); process.exit(1); });
            "

# ── Workflows ────────────────────────────────────────────────

workflows:
  version: 2

  # ──────────────────────────────────────────────
  # OPTION A: Continuous Worker with Auto-Restart
  # 
  # Runs the worker continuously, restarting every 
  # 4.5 hours (before the 5h Cloud timeout).
  # Best for: Production with CircleCI Cloud
  # Requires: Performance plan or higher for 5h jobs
  # ──────────────────────────────────────────────
  # Uncomment below to enable continuous worker
  # 
  # worker-continuous:
  #   jobs:
  #     - worker:
  #         filters:
  #           branches:
  #             only:
  #               - main
  #         # Context with all environment variables
  #         context: opencodehub-production

  # ──────────────────────────────────────────────
  # OPTION B: Scheduled Tasks (Recommended for Free Plan)
  # 
  # Runs individual tasks on a schedule.
  # Each job completes quickly (< 30 min).
  # Best for: Free plan users, light workloads
  # ──────────────────────────────────────────────

  # Merge queue: every 15 minutes
  scheduled-merge-queue:
    triggers:
      - schedule:
          cron: "*/15 * * * *"
          filters:
            branches:
              only:
                - main
    jobs:
      - merge-queue:
          context: opencodehub-production

  # Mirror sync: every 2 hours
  scheduled-mirror-sync:
    triggers:
      - schedule:
          cron: "0 */2 * * *"
          filters:
            branches:
              only:
                - main
    jobs:
      - mirror-sync:
          context: opencodehub-production

  # Cleanup: daily at 4 AM UTC
  scheduled-cleanup:
    triggers:
      - schedule:
          cron: "0 4 * * *"
          filters:
            branches:
              only:
                - main
    jobs:
      - cleanup:
          context: opencodehub-production

  # Health check: every 30 minutes
  scheduled-health:
    triggers:
      - schedule:
          cron: "*/30 * * * *"
          filters:
            branches:
              only:
                - main
    jobs:
      - health-check:
          context: opencodehub-production