;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2021 Leo Prikler <leo.prikler@student.tugraz.at>
;;; Copyright © 2021 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2021 Liliana Marie Prikler <liliana.prikler@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (guix build-system renpy)
  #:use-module (guix store)
  #:use-module (guix utils)
  #:use-module (guix packages)
  #:use-module (guix gexp)
  #:use-module (guix monads)
  #:use-module (guix search-paths)
  #:use-module (guix build-system)
  #:use-module (guix build-system gnu)
  #:use-module (srfi srfi-1)
  #:export (%renpy-build-system-modules
            default-renpy
            renpy-build
            renpy-build-system))

(define (default-renpy)
  "Return the default Ren'py package, resolved lazily."
  (@* (gnu packages game-development) renpy))

(define (default-guile-json)
  "Return the default Guile JSON package, resolved lazily."
  (@* (gnu packages guile) guile-json-4))

(define %renpy-build-system-modules
  ;; Build-side modules imported by default.
  `((guix build renpy-build-system)
    (guix build python-build-system)
    ,@%default-gnu-imported-modules))

(define* (lower name
                #:key source inputs native-inputs outputs system target
                (renpy (default-renpy))
                #:allow-other-keys
                #:rest arguments)
  "Return a bag for NAME."
  (define private-keywords
    '(#:target #:renpy #:inputs #:native-inputs))

  (and (not target)                               ;XXX: no cross-compilation
       (bag
         (name name)
         (system system)
         (host-inputs `(,@(if source
                              `(("source" ,source))
                              '())
                        ,@inputs

                        ;; Keep the standard inputs of 'gnu-build-system'.
                        ,@(standard-packages)))
         (build-inputs `(("renpy" ,renpy)
                         ,@native-inputs))
         (outputs outputs)
         (build renpy-build)
         (arguments (strip-keyword-arguments private-keywords arguments)))))

(define* (renpy-build name inputs
                      #:key
                      source
                      (phases '%standard-phases)
                      (configure-flags ''())
                      (outputs '("out"))
                      (output "out")
                      (game "game")
                      (search-paths '())
                      (system (%current-system))
                      (guile #f)
                      (guile-json (default-guile-json))
                      (imported-modules %renpy-build-system-modules)
                      (modules '((guix build renpy-build-system)
                                 (guix build utils))))
  "Build SOURCE using RENPY, and with INPUTS."
  (define builder
    (with-extensions (list guile-json)
      (with-imported-modules imported-modules
        #~(begin
            (use-modules #$@(sexp->gexp modules))
            (renpy-build #:name #$name
                         #:source #+source
                         #:configure-flags #$configure-flags
                         #:system #$system
                         #:phases #$phases
                         #:outputs #$(outputs->gexp outputs)
                         #:output #$output
                         #:game #$game
                         #:search-paths
                         '#$(sexp->gexp
                             (map search-path-specification->sexp
                                  search-paths))
                         #:inputs #$(input-tuples->gexp inputs))))))

  (mlet %store-monad ((guile (package->derivation (or guile (default-guile))
                                                  system #:graft? #f)))
    (gexp->derivation name builder
                      #:system system
                      #:guile-for-build guile)))

(define renpy-build-system
  (build-system
    (name 'renpy)
    (description "The Ren'py build system")
    (lower lower)))
