(define-module (datarekisteri-service)
  #:use-module (datarekisteri-package)
  #:use-module (guix gexp)
  #:use-module (guix records)
  #:use-module (gnu packages admin)
  #:use-module (gnu services)
  #:use-module (gnu services certbot)
  #:use-module (gnu services configuration)
  #:use-module (gnu services databases)
  #:use-module (gnu services mcron)
  #:use-module (gnu services shepherd)
  #:use-module (gnu services web)
  #:use-module (gnu system shadow)

  #:export (plain-datarekisteri-frontend-service-type
            plain-datarekisteri-frontend-configuration

            plain-datarekisteri-backend-service-type
            plain-datarekisteri-backend-configuration))

(define-maybe/no-serialization string)

(define-configuration/no-serialization plain-datarekisteri-frontend-configuration
  (datarekisteri-frontend
   (file-like datarekisteri-frontend)
   "The datarekisteri-frontend package to use.")
  (backend-url
   (string)
   "The URL for the datarekisteri backend server.")
  (port
   (integer 3000)
   "The TCP port to listen on.")
  (root-url
   (string)
   "The root URL for this server."))

(define (frontend-shepherd-service config)
  (match-record config <plain-datarekisteri-frontend-configuration>
    (backend-url port root-url datarekisteri-frontend)
    (list (shepherd-service
           (documentation "Run the datarekisteri frontend HTTP server")
           (requirement '(networking))
           (provision '(datarekisteri-frontend))
           (start
            #~(make-forkexec-constructor
               (list #$(file-append datarekisteri-frontend "/bin/datarekisteri-frontend")
                     "--server-url" #$backend-url
                     "--port" #$(number->string port)
                     "--approot" #$root-url)
               #:user "datarekisteri-frontend"
               #:group "datarekisteri-frontend"
               #:directory "/var/lib/datarekisteri-frontend"))
           (stop #~(make-kill-destructor))))))

(define (frontend-accounts _)
  (list (user-group
         (name "datarekisteri-frontend")
         (system? #t))
        (user-account
         (name "datarekisteri-frontend")
         (system? #t)
         (group "datarekisteri-frontend")
         (home-directory "/var/lib/datarekisteri-frontend")
         (shell (file-append shadow "/bin/nologin")))))

(define plain-datarekisteri-frontend-service-type
  (service-type
   (name 'plain-datarekisteri-frontend)
   (extensions
     (list (service-extension account-service-type frontend-accounts)
           (service-extension shepherd-root-service-type frontend-shepherd-service)))
   (description "Run the datarekisteri HTTP frontend server")))

(define (file-like-or-string? x)
  (or (file-like? x)
      (string? x)))

(define-configuration/no-serialization plain-datarekisteri-backend-configuration
  (datarekisteri-backend
   (file-like datarekisteri-backend)
   "The datarekisteri-backend package to use.")
  (email-address
   (string)
   "The email address to send emails from.")
  (email-sender
   (maybe-string)
   "The display name for sending emails.")
  (port
   (integer 3100)
   "The TCP port to listen on.")
  (sendmail
   (file-like-or-string)
   "Path to the sendmail program to send emails with."))

(define (backend-shepherd-service config)
  (match-record config <plain-datarekisteri-backend-configuration>
    (email-address email-sender sendmail port datarekisteri-backend)
    (list (shepherd-service
           (documentation "Run the datarekisteri backend HTTP server")
           (requirement '(networking postgres))
           (provision '(datarekisteri-backend))
           (start
            #~(make-forkexec-constructor
               (list #$(file-append datarekisteri-backend "/bin/datarekisteri-backend")
                     "--address" #$email-address
                     #$@(if (maybe-value-set? email-sender) (list "--sender-name" email-sender) '())
                     "--port" #$(number->string port)
                     "--sendmail" #$sendmail)
               #:user "datarekisteri-backend"
               #:group "datarekisteri-backend"
               #:directory "/var/lib/datarekisteri-backend"))
           (stop #~(make-kill-destructor))))))

(define (backend-accounts _)
  (list (user-group
         (name "datarekisteri-backend")
         (system? #t))
        (user-account
         (name "datarekisteri-backend")
         (system? #t)
         (group "datarekisteri-backend")
         (home-directory "/var/lib/datarekisteri-backend")
         (shell (file-append shadow "/bin/nologin")))))

(define (backend-postgresql-roles _)
  (list (postgresql-role
          (name "datarekisteri-backend")
          (create-database? #t))))

(define (backend-profile config)
  (match-record config <plain-datarekisteri-backend-configuration>
    (datarekisteri-backend)
    (list datarekisteri-backend)))

(define (backend-mcron-jobs config)
  (match-record config <plain-datarekisteri-backend-configuration>
    (datarekisteri-backend)
    (list
     #~(job '(next-minute '(0))
            (string-append #$datarekisteri-backend "/bin/datarekisteri-cli gc")
            #:user "datarekisteri-backend"))))

(define plain-datarekisteri-backend-service-type
  (service-type
   (name 'plain-datarekisteri-backend)
   (extensions
     (list (service-extension account-service-type backend-accounts)
           (service-extension mcron-service-type backend-mcron-jobs)
           (service-extension postgresql-role-service-type backend-postgresql-roles)
           (service-extension profile-service-type backend-profile)
           (service-extension shepherd-root-service-type backend-shepherd-service)))
   (description "Run the datarekisteri backend HTTP server")))

; (define datarekisteri-client-service-type
;   (service-type
;    (name 'datarekisteri-client)
;    (extensions
;      (list (service-extension certbot-service-type client-certbot)
;            (service-extension nginx-service-type client-nginx)
;            (service-extension shepherd-root-service-type client-shepherd-service)))
;    (description "Run the datarekisteri HTTP client server")
;    (default-value (datarekisteri-client-configuration))))

; (define datarekisteri-api-service-type
;   (service-type
;    (name 'datarekisteri-api)
;    (extensions
;      (list (service-extension certbot-service-type api-certbot)
;            (service-extension nginx-service-type api-nginx)
;            (service-extension postgresql-role-service-type api-postgresql-roles)
;            (service-extension shepherd-root-service-type api-shepherd-service)))
;    (description "Run the datarekisteri HTTP api server")
;    (default-value (datarekisteri-api-configuration))))

; (define-configuration datarekisteri-client-configuration
;   (https?
;    (boolean #t)
;    "Whether to configure HTTPS with certbot.")
;   (nginx?
;    (boolean #t)
;    "Whether to configure nginx as a reverse proxy.")
;   (api-url
;    (string)
;    "The URL for the graphql API server.")
;   (port
;    (integer 3000)
;    "The TCP port to listen on.")
;   (root-url
;    (string)
;    ""))