(use-modules
  (guix build-system ant)
  (guix build-system copy)
  (guix git-download)
  (guix download)
  (guix packages)
  ((guix licenses) #:prefix license:)
  (gnu packages java))

(define %binary-scala
  (package
    (name "scala")
    (version "2.13.4")
    (source (origin
              (method url-fetch)
              (uri (string-append "https://downloads.lightbend.com/scala/"
                                  version  "/scala-" version ".tgz"))
              (sha256
               (base32
                "1alcnzmxga00nsvgy8yky91zw5b4q0xg2697vrrdgjlglpxiqwdw"))))
    (build-system copy-build-system)
    (arguments
     `(#:install-plan
       '(("." ""))
       #:phases
       (modify-phases %standard-phases
         (add-before 'install 'set-java-home
           (lambda* (#:key inputs #:allow-other-keys)
             (substitute* (find-files "bin" ".")
               (("^#!.*" shebang)
                (string-append shebang "\nJAVA_HOME="
                               (assoc-ref inputs "openjdk"))))))
         (add-before 'set-java-home 'remove-unneeded
           (lambda _
             (for-each delete-file (find-files "bin" "bat$")))))))
    (inputs
     `(("openjdk" ,openjdk14)))
    (home-page "https://scala-lang.org/")
    (synopsis "Scala programming language")
    (description "Scala combines object-oriented and functional programming in
one concise, high-level language.  Scala's static types help avoid bugs in
complex applications, and its JVM and JavaScript runtimes let you build
high-performance systems with easy access to huge ecosystems of libraries.")
    (license license:bsd-3)))

(define scala-asm
  (package
    (inherit java-asm)
    (version "9.1.0")
    (source (origin
              (method git-fetch)
              (uri (git-reference
                     (url "https://github.com/scala/scala-asm")
                     (commit "s-9.1")))
              (file-name (git-file-name "scala-asm" version))
              (sha256
               (base32
                "1wsrlb6kb0fwxjdqanxqgmq4qcyq9gqn129w3l4bj7gvlspll33l"))))
    (arguments
     `(#:jar-name "java-asm.jar"
       #:source-dir "src/main/java"
       ;; no tests
       #:tests? #f))))

(define java-jline3-terminal
  (package
    (name "java-jline3-terminal")
    (version "3.19.0")
    (source (origin
              (method git-fetch)
              (uri (git-reference
                     (url "https://github.com/jline/jline3")
                     (commit (string-append "jline-parent-" version))))
              (file-name (git-file-name name version))
              (sha256
               (base32
                "16cfbkbj925c92xnwq5sbg7v57yh840g0mh95iyzkkajxirz9qn9"))
              (snippet
               ;; calls maven, and conflicts with ant
               `(delete-file "build"))))
    (build-system ant-build-system)
    (arguments
     `(#:jar-name "jline3-terminal.jar"
       #:source-dir "terminal/src/main/java"
       #:test-dir "terminal/src/test"
       #:phases
       (modify-phases %standard-phases
         ;(add-after 'unpack 'make-files-writable
         ;  (lambda _
         ;    (for-each make-file-writable (find-files "."))
         ;    #t))
         (add-before 'build 'copy-resources
           (lambda _
             (copy-recursively
               "terminal/src/main/resources/"
               "build/classes")
             #t)))))
    (native-inputs
     `(("java-easymock" ,java-easymock)
       ("java-junit" ,java-junit)))
    (home-page "")
    (synopsis "")
    (description "")
    (license #f)))

(define java-jline3-reader
  (package
    (inherit java-jline3-terminal)
    (name "java-jline3-reader")
    (arguments
     `(#:jar-name "jline3-reader.jar"
       #:source-dir "reader/src/main/java"
       #:test-dir "reader/src/test"))
    (inputs
     `(("java-jline3-terminal" ,java-jline3-terminal)))))

(define scala
  (package
    (inherit %binary-scala)
    (source (origin
              (method git-fetch)
              (uri (git-reference
                     (url "https://github.com/scala/scala")
                     (commit (string-append "v" (package-version %binary-scala)))))
              (file-name (git-file-name "scala" (package-version %binary-scala)))
              (sha256
               (base32
                "0a6n0wnklya5mvcj03b64my7c30m2zw7spm9j1byv1rraxxjm1q1"))))
    (build-system ant-build-system)
    (arguments
     `(#:tests? #f
       #:phases
       (modify-phases %standard-phases
         (replace 'build
           (lambda* (#:key inputs #:allow-other-keys)
             (define* (build-project directory name #:optional (jar? #t))
               (let* ((build-dir (string-append "build/class/" name))
                      (jar-name (string-append name ".jar"))
                      (java-files (find-files directory ".*.java$"))
                      (scala-files (find-files directory ".*.scala$")))
                 (mkdir-p build-dir)
                 (format #t "Building project ~a...~%" name)
                 (unless (eq? scala-files '())
                   (apply invoke "scalac" "-classpath"
                          (string-append
                            ;; Add any top-level directory in build that may contain
                            ;; .class files, but don't actually add build/ iteself or
                            ;; any individual class file.
                            (string-join
                              (filter (lambda (s) (eq? (string-count s #\/) 1))
                                      (find-files "build" "." #:directories? #t))
                              ":"))
                          "-d" build-dir "-nobootcp"
                          (append scala-files java-files)))
                 (unless (eq? java-files '())
                   (apply invoke "javac" "-classpath"
                          (string-append
                            (getenv "CLASSPATH") ":"
                            (string-join
                              (filter (lambda (s) (eq? (string-count s #\/) 1))
                                      (find-files "build" "." #:directories? #t))
                              ":"))
                          "-g" "-source" "1.8" "-target" "1.8"
                          "-d" build-dir java-files))
                 (mkdir-p "build/jar")
                 (if jar?
                   (invoke "jar" "cf" (string-append "build/jar/" jar-name)
                           "-C" build-dir "."))))

             (let ((scala-asm (assoc-ref inputs "scala-asm")))
               (setenv "CLASSPATH" (string-join (find-files scala-asm ".*.jar$") ":")))
             (setenv "JAVA_OPTS" "-Xmx1G")
             (build-project "src/library" "scala-library")
             (build-project "src/reflect" "scala-reflect")
             (build-project "src/compiler" "scala-compiler" #f)
             (build-project "src/interactive" "scala-compiler-interactive" #f)
             (build-project "src/scaladoc" "scala-compiler-doc" #f)
             (build-project "src/repl" "scala-repl" #f)
             (build-project "src/repl-frontend" "scala-repl-frontend" #f)
             (build-project "src/scalap" "scalap")

             ;; create scala-compiler.jar as a union of some of those above
             (mkdir-p "build/class/compiler")
             (with-directory-excursion "build/class/compiler"
               (let ((scala-asm (assoc-ref inputs "scala-asm")))
                 (invoke "jar" "xf" (car (find-files scala-asm ".*.jar$"))))
               (copy-recursively "../scala-compiler" ".")
               (copy-recursively "../scala-compiler-interactive" ".")
               (copy-recursively "../scala-compiler-doc" ".")
               (copy-recursively "../scala-repl" ".")
               (copy-recursively "../scala-repl-frontend" "."))
             (invoke "jar" "cf" "build/jar/scala-compiler.jar"
                     "-C" "build/class/compiler" ".")))
         (replace 'install
           (lambda* (#:key inputs outputs #:allow-other-keys)
             (let* ((out (assoc-ref outputs "out"))
                    (lib (string-append out "/lib"))
                    (jna (assoc-ref inputs "java-native-access"))
                    (jline-terminal (assoc-ref inputs "java-jline3-terminal"))
                    (jline-reader (assoc-ref inputs "java-jline3-reader")))
               (mkdir-p lib)
               (for-each
                 (lambda (jar)
                   (copy-file jar (string-append lib "/" (basename jar))))
                 (find-files "build/jar" ".*.jar$"))
               (symlink (car (find-files jna "linux-.*.jar$"))
                        (string-append lib "/jna-lib.jar"))
               (symlink (car (find-files jna "jna.jar$"))
                        (string-append lib "/jna.jar"))
               (symlink (car (find-files jline-reader ".*.jar$"))
                        (string-append lib "/jline-reader.jar"))
               (symlink (car (find-files jline-terminal ".*.jar$"))
                        (string-append lib "/jline-terminal.jar")))))
         (add-after 'install 'install-bin
           (lambda* (#:key outputs #:allow-other-keys)
             (let* ((out (assoc-ref outputs "out"))
                    (bin (string-append out "/bin")))
               (define (install-script script class)
                 (let ((script (string-append bin "/" script)))
                   (copy-file "src/compiler/templates/tool-unix.tmpl" script)
                   ;; See project/ScalaTool and build.sbt
                   (substitute* script
                     (("@@") "@")
                     (("@class@") class)
                     (("@properties@") "-Dscala.home=\"$SCALA_HOME\"")
                     (("@javaflags@") "-Xmx256M -Xms32M")
                     (("@toolflags@") "")
                     (("@classpath@") ""))
                   (chmod script #o755)))
               (mkdir-p bin)
               (install-script "scala" "scala.tools.nsc.MainGenericRunner")
               (install-script "scalac" "scala.tools.nsc.Main")
               (install-script "fsc" "scala.tools.nsc.fsc.CompileClient")
               (install-script "scaladoc" "scala.tools.nsc.ScalaDoc")
               (install-script "scalap" "scala.tools.scalap.Main"))))
         )))
    (inputs
     `(("scala" ,%binary-scala)
       ("scala-asm" ,scala-asm)
       ("java-jline3-terminal" ,java-jline3-terminal)
       ("java-jline3-reader" ,java-jline3-reader)
       ("java-native-access" ,java-native-access)))))

%binary-scala
;scala-asm
;java-jline3
;scala