services:
  postgres-db:
    image: postgres:18
    container_name: postgres-db
    restart: unless-stopped
    environment:
      POSTGRES_USER: ${POSTGRES_USER}
      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
      POSTGRES_DB: ${POSTGRES_DB}
    ports:
      - "${PGPORT}:5432"
    volumes:
      - postgres_data:/var/lib/postgresql
      - /data/backup/postgres/wal:/backup/wal
      - ./init-replication-hba.sh:/docker-entrypoint-initdb.d/init-replication-hba.sh:ro
    command:
      - postgres
      - -c
      - wal_level=replica
      - -c
      - archive_mode=on
      - -c
      - archive_command=test -f /backup/wal/%f || cp %p /backup/wal/%f
      - -c
      - archive_timeout=600

  postgres-backup:
    image: postgres:18
    container_name: postgres-backup
    restart: unless-stopped
    depends_on:
      - postgres-db
    environment:
      POSTGRES_USER: ${POSTGRES_USER}
      PGPASSWORD: ${POSTGRES_PASSWORD}
    volumes:
      - /data/backup/postgres:/backup
    entrypoint: ["/bin/bash", "-c"]
    command:
      - |
        mkdir -p /backup/wal /backup/full
        chown 999:999 /backup/wal
        FULL_RETENTION=5
        while true; do
          STAMP=$$(date +%Y-%m-%d_%H-%M-%S)
          DEST="/backup/full/full_$$STAMP"
          echo "Starting full backup: full_$$STAMP"
          if pg_basebackup -h postgres-db -U "$$POSTGRES_USER" -D "$$DEST" -Fp -Xs -P; then
            echo "Full backup complete: full_$$STAMP"
            LATEST_BACKUP_MARKER=$$(ls /backup/wal/*.backup 2>/dev/null | sort | tail -n1)
            if [ -n "$$LATEST_BACKUP_MARKER" ]; then
              echo "Cleaning WAL older than $$(basename "$$LATEST_BACKUP_MARKER")"
              pg_archivecleanup /backup/wal "$$(basename "$$LATEST_BACKUP_MARKER")"
            fi
            ls -1dt /backup/full/full_* | tail -n +$$((FULL_RETENTION + 1)) | while read -r old; do
              echo "Removing old full backup: $$old"
              rm -rf "$$old"
            done
          else
            echo "Full backup FAILED for full_$$STAMP - skipping cleanup"
            rm -rf "$$DEST"
          fi
          sleep 604800
        done

volumes:
  postgres_data: