services:
  kavita:
    image: jvmilazz0/kavita:0.9.1
    restart: unless-stopped
    environment:
      ADMIN_USERNAME: ${ADMIN_USERNAME}
      ADMIN_EMAIL: ${ADMIN_EMAIL}
      ADMIN_PASSWORD: ${ADMIN_PASSWORD}
      TZ: Etc/UTC
    # A new Kavita lets whoever opens it first register as its admin. So until the admin exists,
    # Kavita runs on 127.0.0.1:5001, which nobody reaches, where the admin is registered from the
    # fields; only then does it start as the image starts it, answering on 5000. Kavita reads the
    # port and address of its appsettings.json only when it does not know it is in a container.
    # A refusal stops the start with Kavita's reason in the log.
    entrypoint:
      - /bin/bash
      - -c
      - |
        set -e
        cd /kavita
        if [ ! -f config/admin-registered ]; then
          if [ ! -f config/appsettings.json ]; then
            cp /tmp/config/appsettings.json config/appsettings.json
          fi
          sed -i -e 's/"Port": *[0-9]*/"Port": 5001/' -e 's/"IpAddresses": *"[^"]*"/"IpAddresses": "127.0.0.1"/' config/appsettings.json
          env -u DOTNET_RUNNING_IN_CONTAINER ./Kavita &
          kavita=$$!
          until curl -sf -o /dev/null http://127.0.0.1:5001/api/health; do
            kill -0 $$kavita
            sleep 1
          done
          json() {
            local s=$${1//\\/\\\\}
            s=$${s//\"/\\\"}
            printf '"%s"' "$$s"
          }
          body="{\"username\":$$(json "$$ADMIN_USERNAME"),\"email\":$$(json "$$ADMIN_EMAIL"),\"password\":$$(json "$$ADMIN_PASSWORD")}"
          status=$$(curl -s -o /tmp/register -w '%{http_code}' -H 'Content-Type: application/json' -d "$$body" http://127.0.0.1:5001/api/Account/register)
          kill $$kavita
          wait $$kavita || true
          sed -i -e 's/"Port": *[0-9]*/"Port": 5000/' -e 's/"IpAddresses": *"[^"]*"/"IpAddresses": ""/' config/appsettings.json
          # 400 "denied": an admin exists already, registered by an earlier start.
          if [ "$$status" != 200 ] && ! grep -qi denied /tmp/register; then
            echo "Kavita refused the admin ($$status): $$(cat /tmp/register)"
            exit 1
          fi
          touch config/admin-registered
        fi
        exec /entrypoint.sh
    volumes:
      - config:/kavita/config
      # Writable, so that books can be uploaded or copied in over SFTP.
      - books:/books
volumes:
  config:
  books: