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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2021 Maxime Devos <maximedevos@telenet.be>
+;;;
+;;; 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 (test-luanti)
+  #:use-module (guix build-system luanti)
+  #:use-module (guix upstream)
+  #:use-module (guix memoization)
+  #:use-module (guix import luanti)
+  #:use-module (guix import utils)
+  #:use-module (guix tests)
+  #:use-module (guix packages)
+  #:use-module (guix git-download)
+  #:use-module ((gnu packages luanti)
+                #:select (luanti luanti-technic))
+  #:use-module ((gnu packages base)
+                #:select (hello))
+  #:use-module (json)
+  #:use-module (ice-9 match)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:use-module (srfi srfi-34)
+  #:use-module (srfi srfi-64))
+
+
+;; Some procedures for populating a ‘fake’ ContentDB server.
+
+(define* (make-package-sexp #:key
+                            (guix-name "luanti-foo")
+                            ;; This is not a proper version number but
+                            ;; ContentDB often does not include version
+                            ;; numbers.
+                            (version "2021-07-25")
+                            (home-page "https://example.org/foo")
+                            (repo "https://example.org/foo.git")
+                            (synopsis "synopsis")
+                            (guix-description "description.")
+                            (guix-license
+                             '(list license:cc-by-sa4.0 license:lgpl3+))
+                            (inputs '())
+                            (upstream-name "Author/foo")
+                            #:allow-other-keys)
+  `(package
+     (name ,guix-name)
+     (version ,version)
+     (source
+      (origin
+        (method git-fetch)
+        (uri (git-reference
+               (url ,(and (not (eq? repo 'null)) repo))
+               (commit #f)))
+        (file-name (git-file-name name version))
+        (sha256
+         (base32 #f))))
+     (build-system luanti-mod-build-system)
+     ,@(maybe-propagated-inputs inputs)
+     (home-page ,home-page)
+     (synopsis ,synopsis)
+     (description ,guix-description)
+     (license ,guix-license)
+     (properties
+      ,(list 'quasiquote
+             `((upstream-name . ,upstream-name))))))
+
+(define* (make-package-json #:key
+                            (author "Author")
+                            (name "foo")
+                            (media-license "CC-BY-SA-4.0")
+                            (license "LGPL-3.0-or-later")
+                            (short-description "synopsis")
+                            (long-description "description")
+                            (repo "https://example.org/foo.git")
+                            (website "https://example.org/foo")
+                            (forums 321)
+                            (score 987.654)
+                            (downloads 123)
+                            (type "mod")
+                            #:allow-other-keys)
+  `(("author" . ,author)
+    ("content_warnings" . #())
+    ("created_at" . "2018-05-23T19:58:07.422108")
+    ("downloads" . ,downloads)
+    ("forums" . ,forums)
+    ("issue_tracker" . "https://example.org/foo/issues")
+    ("license" . ,license)
+    ("long_description" . ,long-description)
+    ("maintainers" . #("maintainer"))
+    ("media_license" . ,media-license)
+    ("name" . ,name)
+    ("provides" . #("stuff"))
+    ("release" . 456)
+    ("repo" . ,repo)
+    ("score" . ,score)
+    ("screenshots" . #())
+    ("short_description" . ,short-description)
+    ("state" . "APPROVED")
+    ("tags" . #("some" "tags"))
+    ("thumbnail" . null)
+    ("title" . "The name")
+    ("type" . ,type)
+    ("url" . ,(string-append "https://content.luanti.net/packages/"
+                             author "/" name "/download/"))
+    ("website" . ,website)))
+
+(define* (make-releases-json #:key (commit #f) (title "2021-07-25") #:allow-other-keys)
+  `#((("commit" . ,commit)
+      ("downloads" . 469)
+      ("id" . 8614)
+      ("max_luanti_version" . null)
+      ("min_luanti_version" . null)
+      ("release_date" . "2021-07-25T01:10:23.207584")
+      ("title" . ,title))))
+
+(define* (make-dependencies-json #:key (author "Author")
+                                 (name "foo")
+                                 (requirements '(("default" #f ())))
+                                 #:allow-other-keys)
+  `((,(string-append author "/" name)
+     . ,(list->vector
+         (map (match-lambda
+                ((symbolic-name optional? implementations)
+                 `(("is_optional" . ,optional?)
+                   ("name" . ,symbolic-name)
+                   ("packages" . ,(list->vector implementations)))))
+              requirements)))
+    ("something/else" . #())))
+
+(define* (make-packages-keys-json #:key (author "Author")
+                                  (name "Name")
+                                  (type "mod"))
+  `(("author" . ,author)
+    ("name" . ,name)
+    ("type" . ,type)))
+
+(define (call-with-packages thunk . argument-lists)
+  ;; Don't reuse results from previous tests.
+  (invalidate-memoization! contentdb-fetch)
+  (invalidate-memoization! luanti->guix-package)
+  (define (scm->json-port scm)
+    (open-input-string (scm->json-string scm)))
+  (define (handle-package url requested-author requested-name . rest)
+    (define relevant-argument-list
+      (any (lambda (argument-list)
+             (apply (lambda* (#:key (author "Author") (name "foo")
+                              #:allow-other-keys)
+                      (and (equal? requested-author author)
+                           (equal? requested-name name)
+                           argument-list))
+                    argument-list))
+           argument-lists))
+    (when (not relevant-argument-list)
+      (error "the package ~a/~a should be irrelevant, but ~a is fetched"
+             requested-author requested-name url))
+    (scm->json-port
+     (apply (match rest
+              (("") make-package-json)
+              (("dependencies" "") make-dependencies-json)
+              (("releases" "") make-releases-json)
+              (_ (error "TODO ~a" rest)))
+            relevant-argument-list)))
+  (define (handle-mod-search sort)
+    ;; Produce search results, sorted by SORT in descending order.
+    (define arguments->key
+      (match sort
+        ("score" (lambda* (#:key (score 987.654) #:allow-other-keys)
+                   score))
+        ("downloads" (lambda* (#:key (downloads 123) #:allow-other-keys)
+                       downloads))))
+    (define argument-list->key (cut apply arguments->key <>))
+    (define (greater x y)
+      (> (argument-list->key x) (argument-list->key y)))
+    (define sorted-argument-lists (sort-list argument-lists greater))
+    (define* (arguments->json #:key (author "Author") (name "Foo") (type "mod")
+                              #:allow-other-keys)
+      (and (string=? type "mod")
+           `(("author" . ,author)
+             ("name" . ,name)
+             ("type" . ,type))))
+    (define argument-list->json (cut apply arguments->json <>))
+    (scm->json-port
+     (list->vector (filter-map argument-list->json sorted-argument-lists))))
+  (mock ((guix http-client) http-fetch
+         (lambda* (url #:key headers timeout)
+           (unless (string-prefix? "mock://api/packages/" url)
+             (error "the URL ~a should not be used" url))
+           (define resource
+             (substring url (string-length "mock://api/packages/")))
+           (define components (string-split resource #\/))
+           (match components
+             ((author name . rest)
+              (apply handle-package url author name rest))
+             (((? (cut string-prefix? "?type=mod&q=" <>) query))
+              (handle-mod-search
+               (cond ((string-contains query "sort=score") "score")
+                     ((string-contains query "sort=downloads") "downloads")
+                     (#t (error "search query ~a has unknown sort key"
+                                query)))))
+             (_
+              (error "the URL ~a should have an author and name component"
+                     url)))))
+        (parameterize ((%contentdb-api "mock://api/"))
+          (thunk))))
+
+(define* (luanti->guix-package* #:key (author "Author") (name "foo")
+                                  (sort %default-sort-key)
+                                  #:allow-other-keys)
+  (luanti->guix-package (string-append author "/" name) #:sort sort))
+
+(define (imported-package-sexp* primary-arguments . secondary-arguments)
+  "Ask the importer to import a package specified by PRIMARY-ARGUMENTS,
+during a dynamic where that package and the packages specified by
+SECONDARY-ARGUMENTS are available on ContentDB."
+  (apply call-with-packages
+         (lambda ()
+           ;; The memoization cache is reset by call-with-packages
+           (apply luanti->guix-package* primary-arguments))
+   primary-arguments
+   secondary-arguments))
+
+(define (imported-package-sexp . extra-arguments)
+  "Ask the importer to import a package specified by EXTRA-ARGUMENTS,
+during a dynamic extent where that package is available on ContentDB."
+  (imported-package-sexp* extra-arguments))
+
+(define-syntax-rule (test-package test-case . extra-arguments)
+  (test-equal test-case
+    (make-package-sexp . extra-arguments)
+    (imported-package-sexp . extra-arguments)))
+
+(define-syntax-rule (test-package* test-case primary-arguments extra-arguments
+                                   ...)
+  (test-equal test-case
+    (apply make-package-sexp primary-arguments)
+    (imported-package-sexp* primary-arguments extra-arguments ...)))
+
+(test-begin "luanti")
+
+
+;; Package names
+(test-package "luanti->guix-package")
+(test-package "luanti->guix-package, _ → - in package name"
+              #:name "foo_bar"
+              #:guix-name "luanti-foo-bar"
+              #:upstream-name "Author/foo_bar")
+
+(test-equal "elaborate names, unambiguous"
+  "Jeija/mesecons"
+  (call-with-packages
+   (cut elaborate-contentdb-name "mesecons")
+   '(#:name "mesecons" #:author "Jeija")
+   '(#:name "something" #:author "else")))
+
+(test-equal "elaborate name, ambiguous (highest score)"
+  "Jeija/mesecons"
+  (call-with-packages
+   ;; #:sort "score" is the default
+   (cut elaborate-contentdb-name "mesecons")
+   '(#:name "mesecons" #:author "Jeijc" #:score 777)
+   '(#:name "mesecons" #:author "Jeijb" #:score 888)
+   '(#:name "mesecons" #:author "Jeija" #:score 999)))
+
+
+(test-equal "elaborate name, ambiguous (most downloads)"
+  "Jeija/mesecons"
+  (call-with-packages
+   (cut elaborate-contentdb-name "mesecons" #:sort "downloads")
+   '(#:name "mesecons" #:author "Jeijc" #:downloads 777)
+   '(#:name "mesecons" #:author "Jeijb" #:downloads 888)
+   '(#:name "mesecons" #:author "Jeija" #:downloads 999)))
+
+
+;; Determining the home page
+(test-package "luanti->guix-package, website is used as home page"
+              #:home-page "web://site"
+              #:website "web://site")
+(test-package "luanti->guix-package, if absent, the forum is used"
+              #:home-page '(luanti-topic 628)
+              #:forums 628
+              #:website 'null)
+(test-package "luanti->guix-package, if absent, the git repo is used"
+              #:home-page "https://github.com/luanti-mods/mesecons"
+              #:forums 'null
+              #:website 'null
+              #:repo "https://github.com/luanti-mods/mesecons")
+(test-package "luanti->guix-package, all home page information absent"
+              #:home-page #f
+              #:forums 'null
+              #:website 'null
+              #:repo 'null)
+
+
+;; Determining the version number
+
+(test-package "conventional version number" #:version "1.2.3" #:title "1.2.3")
+;; See e.g. orwell/basic_trains
+(test-package "v-prefixed version number" #:version "1.2.3" #:title "v1.2.3")
+;; Many mods on ContentDB use dates as release titles.  In that case, the date
+;; will have to do.
+(test-package "dates as version number"
+              #:version "2021-01-01" #:title "2021-01-01")
+
+
+
+;; Dependencies
+(test-package* "luanti->guix-package, unambiguous dependency"
+  (list #:requirements '(("mesecons" #f
+                          ("Jeija/mesecons"
+                           "some-modpack/containing-mese")))
+        #:inputs '("luanti-mesecons"))
+  (list #:author "Jeija" #:name "mesecons")
+  (list #:author "some-modpack" #:name "containing-mese" #:type "modpack"))
+
+(test-package* "luanti->guix-package, ambiguous dependency (highest score)"
+  (list #:name "frobnicate"
+        #:guix-name "luanti-frobnicate"
+        #:upstream-name "Author/frobnicate"
+        #:requirements '(("frob" #f
+                          ("Author/foo" "Author/bar")))
+        ;; #:sort "score" is the default
+        #:inputs '("luanti-bar"))
+  (list #:author "Author" #:name "foo" #:score 0)
+  (list #:author "Author" #:name "bar" #:score 9999))
+
+(test-package* "luanti->guix-package, ambiguous dependency (most downloads)"
+  (list #:name "frobnicate"
+        #:guix-name "luanti-frobnicate"
+        #:upstream-name "Author/frobnicate"
+        #:requirements '(("frob" #f
+                          ("Author/foo" "Author/bar")))
+        #:inputs '("luanti-bar")
+        #:sort "downloads")
+  (list #:author "Author" #:name "foo" #:downloads 0)
+  (list #:author "Author" #:name "bar" #:downloads 9999))
+
+(test-package "luanti->guix-package, optional dependency"
+              #:requirements '(("mesecons" #t
+                                ("Jeija/mesecons"
+                                 "some-modpack/containing-mese")))
+              #:inputs '())
+
+;; See e.g. 'orwell/basic_trains'
+(test-package* "luanti->guix-package, multiple dependencies implemented by one mod"
+  (list #:name "frobnicate"
+        #:guix-name "luanti-frobnicate"
+        #:upstream-name "Author/frobnicate"
+        #:requirements '(("frob" #f ("Author/frob"))
+                         ("frob_x" #f ("Author/frob")))
+        #:inputs '("luanti-frob"))
+  (list #:author "Author" #:name "frob"))
+
+
+;; License
+(test-package "luanti->guix-package, identical licenses"
+              #:guix-license 'license:lgpl3+
+              #:license "LGPL-3.0-or-later"
+              #:media-license "LGPL-3.0-or-later")
+
+;; Sorting
+(let* ((make-package
+        (lambda arguments
+          (json->package (apply make-package-json arguments))))
+       (x (make-package #:score 0))
+       (y (make-package #:score 1))
+       (z (make-package #:score 2)))
+  (test-equal "sort-packages, already sorted"
+    (list z y x)
+    (sort-packages (list z y x)))
+  (test-equal "sort-packages, reverse"
+    (list z y x)
+    (sort-packages (list x y z))))
+
+
+
+;; Update detection
+(define (upstream-source->sexp upstream-source)
+  (define url (upstream-source-urls upstream-source))
+  (unless (git-reference? url)
+    (error "a <git-reference> is expected"))
+  `(,(upstream-source-package upstream-source)
+    ,(upstream-source-version upstream-source)
+    ,(git-reference-url url)
+    ,(git-reference-commit url)))
+
+(define* (expected-sexp #:key
+                        (repo "https://example.org/foo.git")
+                        (guix-name "luanti-foo")
+                        (new-version "0.8")
+                        (commit "44941798d222901b8f381b3210957d880b90a2fc")
+                        #:allow-other-keys)
+  `(,guix-name ,new-version ,repo ,commit))
+
+(define* (example-package #:key
+                          (source 'auto)
+                          (repo "https://example.org/foo.git")
+                          (old-version "0.8")
+                          (commit "44941798d222901b8f381b3210957d880b90a2fc")
+                          #:allow-other-keys)
+  (package
+    (name "luanti-foo")
+    (version old-version)
+    (source
+     (if (eq? source 'auto)
+         (origin
+           (method git-fetch)
+           (uri (git-reference
+                 (url repo)
+                 (commit commit #;"808f9ffbd3106da4c92d2367b118b98196c9e81e")))
+           (sha256 #f) ; not important for the following tests
+           (file-name (git-file-name name version)))
+         source))
+    (build-system luanti-mod-build-system)
+    (license #f)
+    (synopsis #f)
+    (description #f)
+    (home-page #f)
+    (properties '((upstream-name . "Author/foo")))))
+
+(define-syntax-rule (test-release test-case . arguments)
+  (test-equal test-case
+    (expected-sexp . arguments)
+    (and=>
+     (call-with-packages
+      (cut latest-luanti-release (example-package . arguments))
+      (list . arguments))
+     upstream-source->sexp)))
+
+(define-syntax-rule (test-no-release test-case . arguments)
+  (test-equal test-case
+    #f
+    (call-with-packages
+     (cut latest-luanti-release (example-package . arguments))
+     (list . arguments))))
+
+(test-release "same version"
+  #:old-version "0.8" #:title "0.8" #:new-version "0.8"
+  #:commit "44941798d222901b8f381b3210957d880b90a2fc")
+
+(test-release "new version (dotted)"
+  #:old-version "0.8" #:title "0.9.0" #:new-version "0.9.0"
+  #:commit "c8855b991880897b2658dc90164e29c96e2aeb3a")
+
+(test-release "new version (date)"
+  #:old-version "2014-11-17" #:title "2015-11-04"
+  #:new-version "2015-11-04"
+  #:commit "c8855b991880897b2658dc90164e29c96e2aeb3a")
+
+(test-release "new version (git -> dotted)"
+  #:old-version
+  (git-version "0.8" "1" "90422555f114d3af35e7cc4b5b6d59a5c226adc4")
+  #:title "0.9.0" #:new-version "0.9.0"
+  #:commit "90422555f114d3af35e7cc4b5b6d59a5c226adc4")
+
+;; There might actually be a new release, but guix cannot compare dates
+;; with regular version numbers.
+(test-no-release "dotted -> date"
+  #:old-version "0.8" #:title "2015-11-04"
+  #:commit "c8855b991880897b2658dc90164e29c96e2aeb3a")
+
+(test-no-release "date -> dotted"
+  #:old-version "2014-11-07" #:title "0.8"
+  #:commit "c8855b991880897b2658dc90164e29c96e2aeb3a")
+
+;; Don't let "guix refresh -t luanti" tell there are new versions
+;; if Guix has insufficient information to actually perform the update,
+;; when using --with-latest or "guix refresh -u".
+(test-no-release "no commit information, no new release"
+  #:old-version "0.8" #:title "0.9.0" #:new-version "0.9.0"
+  #:commit #false)
+
+(test-assert "luanti is not a luanti mod"
+  (not (luanti-package? luanti)))
+(test-assert "GNU hello is not a luanti mod"
+  (not (luanti-package? hello)))
+(test-assert "technic is a luanti mod"
+  (luanti-package? luanti-technic))
+(test-assert "upstream-name is required"
+  (not (luanti-package?
+        (package (inherit luanti-technic)
+                 (properties '())))))
+
+(test-end "luanti")
+
+;;; Local Variables:
+;;; eval: (put 'test-package* 'scheme-indent-function 1)
+;;; eval: (put 'test-release 'scheme-indent-function 1)
+;;; eval: (put 'test-no-release 'scheme-indent-function 1)
+;;; End: