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;;; Guix Data Service -- Information about Guix over time
;;; Copyright © 2019 Christopher Baines <mail@cbaines.net>
;;;
;;; This program is free software: you can redistribute it and/or
;;; modify it under the terms of the GNU Affero General Public License
;;; as published by the Free Software Foundation, either version 3 of
;;; the License, or (at your option) any later version.
;;;
;;; This program 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
;;; Affero General Public License for more details.
;;;
;;; You should have received a copy of the GNU Affero General Public
;;; License along with this program.  If not, see
;;; <http://www.gnu.org/licenses/>.

(define-module (guix-data-service web repository controller)
  #:use-module (ice-9 match)
  #:use-module (web uri)
  #:use-module (web request)
  #:use-module (guix-data-service utils)
  #:use-module (guix-data-service database)
  #:use-module (guix-data-service web render)
  #:use-module (guix-data-service web query-parameters)
  #:use-module (guix-data-service web util)
  #:use-module (guix-data-service model utils)
  #:use-module (guix-data-service model build-server)
  #:use-module (guix-data-service model system)
  #:use-module (guix-data-service model derivation)
  #:use-module (guix-data-service model package)
  #:use-module (guix-data-service model system-test)
  #:use-module (guix-data-service model git-branch)
  #:use-module (guix-data-service model git-repository)
  #:use-module (guix-data-service web view html)
  #:use-module (guix-data-service web revision controller)
  #:use-module (guix-data-service web controller)
  #:use-module (guix-data-service web repository html)
  #:export (repository-controller))

(define (repository-controller request
                               method-and-path-components
                               mime-types
                               body)
  (define path
    (uri-path (request-uri request)))

  (match method-and-path-components
    (('GET "repositories")
     (letpar& ((git-repositories
                (call-with-resource-from-pool (connection-pool)
                  all-git-repositories)))
       (case (most-appropriate-mime-type
              '(application/json text/html)
              mime-types)
         ((application/json)
          (render-json
           `((repositories
              . ,(list->vector
                  (map (match-lambda
                         ((id label url cgit-base-url)
                          `((id    . ,id)
                            (label . ,label)
                            (url   . ,url))))
                       git-repositories))))))
         (else
          (render-html
           #:sxml
           (view-git-repositories git-repositories))))))
    (('GET "repository" id)
     (match (with-resource-from-pool (connection-pool) conn
              (select-git-repository conn id))
       ((label url cgit-url-base fetch-with-authentication?)
        (letpar& ((branches
                   (with-resource-from-pool (connection-pool) conn
                     (all-branches-with-most-recent-commit
                      conn
                      (string->number id)))))
          (case (most-appropriate-mime-type
                 '(application/json text/html)
                 mime-types)
            ((application/json)
             (render-json
              `((id . ,id)
                (label . ,label)
                (url . ,url)
                (branches
                 . ,(list->vector
                     (map (match-lambda
                            ((name commit date revision-exists? job-events)
                             `((name . ,name)
                               (commit . ,commit))))
                          branches))))))
            (else
             (render-html
              #:sxml
              (view-git-repository
               (string->number id)
               label url cgit-url-base
               branches))))))
       (#f
        (case (most-appropriate-mime-type
               '(application/json text/html)
               mime-types)
          ((application/json)
           (render-json
            '((error . "Repository not found"))
            #:code 404))
          (else
           (render-html
            #:sxml (general-not-found
                    "Repository not found"
                    "")
            #:code 404))))))
    (('GET "repository" repository-id "branch" branch-name)
     (let ((parsed-query-parameters
            (parse-query-parameters
             request
             `((after_date     ,parse-datetime)
               (before_date    ,parse-datetime)
               (limit_results  ,parse-result-limit #:default 100)))))
       (letpar& ((revisions
                  (with-resource-from-pool (connection-pool) conn
                    (most-recent-commits-for-branch
                     conn
                     (string->number repository-id)
                     branch-name
                     #:limit (assq-ref parsed-query-parameters 'limit_results)
                     #:after-date (assq-ref parsed-query-parameters
                                            'after_date)
                     #:before-date (assq-ref parsed-query-parameters
                                             'before_date)))))
         (case (most-appropriate-mime-type
                '(application/json text/html)
                mime-types)
           ((application/json)
            (render-json
             `((revisions
                . ,(list->vector
                    (map (match-lambda
                           ((commit-hash date data-available? _)
                            `((date            . ,date)
                              (commit-hash     . ,commit-hash)
                              (data_available  . ,data-available?))))
                         revisions))))))
           (else
            (if (null? revisions)
                (render-html
                 #:sxml (general-not-found
                         "Branch not found"
                         "")
                 #:code 404)
                (render-html
                 #:sxml (if (any-invalid-query-parameters? parsed-query-parameters)
                            (view-branch repository-id
                                         branch-name parsed-query-parameters '())
                            (view-branch
                             repository-id
                             branch-name
                             parsed-query-parameters
                             revisions)))))))))
    (('GET "repository" repository-id "branch" branch-name "package" package-name)
     (letpar& ((package-versions
                (with-resource-from-pool (connection-pool) conn
                  (package-versions-for-branch conn
                                               (string->number repository-id)
                                               branch-name
                                               package-name))))
       (case (most-appropriate-mime-type
              '(application/json text/html)
              mime-types)
         ((application/json)
          (render-json
           `((versions . ,(list->vector
                           (map (match-lambda
                                  ((package-version first-guix-revision-commit
                                                    first-datetime
                                                    last-guix-revision-commit
                                                    last-datetime)
                                   `((version . ,package-version)
                                     (first_revision
                                      . ((commit . ,first-guix-revision-commit)
                                         (datetime . ,first-datetime)))
                                     (last_revision
                                      . ((commit . ,last-guix-revision-commit)
                                         (datetime . ,last-datetime))))))
                                package-versions))))))
         (else
          (render-html
           #:sxml (view-branch-package
                   repository-id
                   branch-name
                   package-name
                   package-versions))))))
    (('GET "repository" repository-id "branch" branch-name "package" package-name "derivation-history")
     (render-branch-package-derivation-history request
                                               mime-types
                                               repository-id
                                               branch-name
                                               package-name))
    (('GET "repository" repository-id "branch" branch-name
           "package" package-name "output-history")
     (render-branch-package-output-history request
                                           mime-types
                                           repository-id
                                           branch-name
                                           package-name))
    (('GET "repository" repository-id "branch" branch-name
           "system-test" system-test-name)
     (let ((parsed-query-parameters
            (parse-query-parameters
             request
             `((system ,parse-system #:default "x86_64-linux")))))
       (letpar& ((system-test-history
                  (with-resource-from-pool (connection-pool) conn
                    (system-test-derivations-for-branch
                     conn
                     (string->number repository-id)
                     branch-name
                     (assq-ref parsed-query-parameters
                               'system)
                     system-test-name)))
                 (valid-systems
                  (call-with-resource-from-pool (connection-pool)
                                                list-systems)))
         (case (most-appropriate-mime-type
                '(application/json text/html)
                mime-types)
           ((application/json)
            (render-json
             `((versions
                . ,(list->vector
                    (map (match-lambda
                           ((derivation-file-name
                             first-guix-revision-commit
                             first-datetime
                             last-guix-revision-commit
                             last-datetime
                             builds)
                            `((derivation_file_name . ,derivation-file-name)
                              (first_revision
                               . ((commit . ,first-guix-revision-commit)
                                  (datetime . ,first-datetime)))
                              (last_revision
                               . ((commit . ,last-guix-revision-commit)
                                  (datetime . ,last-datetime)))
                              (builds . ,(list->vector builds)))))
                         system-test-history))))))
           (else
            (render-html
             #:sxml (view-branch-system-test-history
                     parsed-query-parameters
                     repository-id
                     branch-name
                     system-test-name
                     valid-systems
                     system-test-history)))))))
    (('GET "repository" repository-id "branch" branch-name "latest-processed-revision")
     (letpar& ((commit-hash
                (with-resource-from-pool (connection-pool) conn
                  (latest-processed-commit-for-branch conn
                                                      repository-id
                                                      branch-name))))
       (if commit-hash
           (render-view-revision mime-types
                                 commit-hash
                                 #:path-base path
                                 #:header-text
                                 `("Latest processed revision for branch "
                                   (samp ,branch-name)))
           (render-no-latest-revision mime-types
                                      repository-id
                                      branch-name))))
    (('GET "repository" repository-id "branch" branch-name "latest-processed-revision" "packages")
     (letpar& ((commit-hash
                (with-resource-from-pool (connection-pool) conn
                  (latest-processed-commit-for-branch conn
                                                      repository-id
                                                      branch-name))))
       (if commit-hash
           (let ((parsed-query-parameters
                  (guard-against-mutually-exclusive-query-parameters
                   (parse-query-parameters
                    request
                    `((locale         ,identity #:default "en_US.UTF-8")
                      (after_name     ,identity)
                      (field          ,identity #:multi-value
                                      #:default ("version" "synopsis"))
                      (search_query   ,identity)
                      (limit_results  ,parse-result-limit
                                      #:no-default-when (all_results)
                                      #:default 100)
                      (all_results    ,parse-checkbox-value)))
                   ;; You can't specify a search query, but then also limit the
                   ;; results by filtering for after a particular package name
                   '((after_name search_query)
                     (limit_results all_results)))))

             (render-revision-packages mime-types
                                       commit-hash
                                       parsed-query-parameters
                                       #:path-base path
                                       #:header-text
                                       `("Latest processed revision for branch "
                                         (samp ,branch-name))
                                       #:header-link
                                       (string-append
                                        "/repository/" repository-id
                                        "/branch/" branch-name
                                        "/latest-processed-revision")))
           (render-no-latest-revision mime-types
                                      repository-id
                                      branch-name))))
    (('GET "repository" repository-id "branch" branch-name "latest-processed-revision" "package-derivations")
     (letpar& ((commit-hash
                (with-resource-from-pool (connection-pool) conn
                  (latest-processed-commit-for-branch conn
                                                      repository-id
                                                      branch-name))))
       (if commit-hash
           (let ((parsed-query-parameters
                  (guard-against-mutually-exclusive-query-parameters
                   (parse-query-parameters
                    request
                    `((search_query   ,identity)
                      (system ,parse-system #:multi-value)
                      (target ,parse-target #:multi-value)
                      (maximum_builds ,parse-number)
                      (minimum_builds ,parse-number)
                      (build_status   ,parse-derivation-build-status)
                      (field          ,identity #:multi-value
                                      #:default ("system" "target" "builds"))
                      (after_name ,identity)
                      (limit_results  ,parse-result-limit
                                      #:no-default-when (all_results)
                                      #:default 10)
                      (all_results    ,parse-checkbox-value)))
                   '((limit_results all_results)))))

             (render-revision-package-derivations mime-types
                                                  commit-hash
                                                  parsed-query-parameters
                                                  #:path-base path))
           (render-no-latest-revision mime-types
                                      repository-id
                                      branch-name))))
    (('GET "repository" repository-id "branch" branch-name
           "latest-processed-revision" "fixed-output-package-derivations")
     (let ((commit-hash
            (with-resource-from-pool (connection-pool) conn
              (latest-processed-commit-for-branch conn
                                                  repository-id
                                                  branch-name))))
       (if commit-hash
           (let ((parsed-query-parameters
                  (guard-against-mutually-exclusive-query-parameters
                   (parse-query-parameters
                    request
                    `((system ,parse-system #:default "x86_64-linux")
                      (target ,parse-target #:default "")
                      (latest_build_status   ,parse-build-status)
                      (after_name ,identity)
                      (limit_results  ,parse-result-limit
                                      #:no-default-when (all_results)
                                      #:default 50)
                      (all_results    ,parse-checkbox-value)))
                   '((limit_results all_results)))))

             (render-revision-fixed-output-package-derivations
              mime-types
              commit-hash
              parsed-query-parameters
              #:path-base path))
           (render-no-latest-revision mime-types
                                      repository-id
                                      branch-name))))
    (('GET "repository" repository-id "branch" branch-name "latest-processed-revision" "package-derivation-outputs")
     (let ((commit-hash
            (with-resource-from-pool (connection-pool) conn
              (latest-processed-commit-for-branch conn
                                                  repository-id
                                                  branch-name))))
       (if commit-hash
           (let ((parsed-query-parameters
                  (guard-against-mutually-exclusive-query-parameters
                   (parse-query-parameters
                    request
                    `((search_query ,identity)
                      (after_path ,identity)
                      (substitutes_available_from ,parse-number
                                                  #:multi-value)
                      (substitutes_not_available_from ,parse-number
                                                      #:multi-value)
                      (output_consistency ,identity
                                          #:default "any")
                      (system ,parse-system #:default "x86_64-linux")
                      (target ,parse-target #:default "")
                      (field          ,identity #:multi-value
                                      #:default ("nars"))
                      (limit_results  ,parse-result-limit
                                      #:no-default-when (all_results)
                                      #:default 10)
                      (all_results    ,parse-checkbox-value)))
                   '((limit_results all_results)))))

             (render-revision-package-derivation-outputs
              mime-types
              commit-hash
              parsed-query-parameters
              #:path-base path
              #:header-text
              `("Latest processed revision for branch "
                (samp ,branch-name))
              #:header-link
              (string-append
               "/repository/" repository-id
               "/branch/" branch-name
               "/latest-processed-revision")))
           (render-no-latest-revision mime-types
                                      repository-id
                                      branch-name))))
    (('GET "repository" repository-id "branch" branch-name
           "latest-processed-revision" "system-tests")
     (letpar& ((commit-hash
                (with-resource-from-pool (connection-pool) conn
                  (latest-processed-commit-for-branch conn
                                                      repository-id
                                                      branch-name))))
       (if commit-hash
           (let ((parsed-query-parameters
                  (parse-query-parameters
                   request
                   `((system ,parse-system #:default "x86_64-linux")))))
             (render-revision-system-tests mime-types
                                           commit-hash
                                           parsed-query-parameters
                                           #:path-base path))
           (render-no-latest-revision mime-types
                                      repository-id
                                      branch-name))))
    (('GET "repository" repository-id "branch" branch-name "latest-processed-revision" "package-reproducibility")
     (letpar& ((commit-hash
                (with-resource-from-pool (connection-pool) conn
                  (latest-processed-commit-for-branch conn
                                                      repository-id
                                                      branch-name))))
       (if commit-hash
           (render-revision-package-reproduciblity
            mime-types
            commit-hash
            #:path-base path
            #:header-text
            `("Latest processed revision for branch "
              (samp ,branch-name))
            #:header-link
            (string-append
             "/repository/" repository-id
             "/branch/" branch-name
             "/latest-processed-revision"))
           (render-no-latest-revision mime-types
                                      repository-id
                                      branch-name))))
    (('GET "repository" repository-id "branch" branch-name "latest-processed-revision" "package-substitute-availability")
     (letpar& ((commit-hash
                (with-resource-from-pool (connection-pool) conn
                  (latest-processed-commit-for-branch conn
                                                      repository-id
                                                      branch-name))))
       (if commit-hash
           (render-revision-package-substitute-availability mime-types
                                                            commit-hash
                                                            #:path-base path)
           (render-no-latest-revision mime-types
                                      repository-id
                                      branch-name))))
    (('GET "repository" repository-id "branch" branch-name "latest-processed-revision"
           "lint-warnings")
     (letpar& ((commit-hash
                (with-resource-from-pool (connection-pool) conn
                  (latest-processed-commit-for-branch conn
                                                      repository-id
                                                      branch-name))))
       (if commit-hash
           (let ((parsed-query-parameters
                  (parse-query-parameters
                   request
                   `((locale         ,identity #:default "en_US.UTF-8")
                     (package_query  ,identity)
                     (linter         ,identity #:multi-value)
                     (message_query  ,identity)
                     (field          ,identity #:multi-value
                                     #:default ("linter"
                                                "message"
                                                "location"))))))

             (render-revision-lint-warnings mime-types
                                            commit-hash
                                            parsed-query-parameters
                                            #:path-base path
                                            #:header-text
                                            `("Latest processed revision for branch "
                                              (samp ,branch-name))
                                            #:header-link
                                            (string-append
                                             "/repository/" repository-id
                                             "/branch/" branch-name
                                             "/latest-processed-revision")))
           (render-no-latest-revision mime-types
                                      repository-id
                                      branch-name))))
    (('GET "repository" repository-id "branch" branch-name "latest-processed-revision" "package" name version)
     (letpar& ((commit-hash
                (with-resource-from-pool (connection-pool) conn
                  (latest-processed-commit-for-branch conn
                                                      repository-id
                                                      branch-name))))
       (let ((parsed-query-parameters
              (parse-query-parameters
               request
               `((locale ,identity #:default "en_US.UTF-8")))))
         (if commit-hash
             (render-revision-package-version mime-types
                                              commit-hash
                                              name
                                              version
                                              parsed-query-parameters
                                              #:header-text
                                              `("Latest processed revision for branch "
                                                (samp ,branch-name))
                                              #:header-link
                                              (string-append
                                               "/repository/" repository-id
                                               "/branch/" branch-name
                                               "/latest-processed-revision")
                                              #:version-history-link
                                              (string-append
                                               "/repository/" repository-id
                                               "/branch/" branch-name
                                               "/package/" name))
             (render-no-latest-revision mime-types
                                        repository-id
                                        branch-name)))))
     (_ #f)))

(define (parse-build-system)
  (let ((systems
         (call-with-resource-from-pool
          (connection-pool)
          list-systems)))
    (lambda (s)
      (if (member s systems)
          s
          (make-invalid-query-parameter
           s "unknown system")))))

(define (render-no-latest-revision mime-types git-repository-id branch-name)
  (case (most-appropriate-mime-type
         '(application/json text/html)
         mime-types)
    ((application/json)
     (render-json
      '((error . "no latest revision"))
      #:code 404))
    (else
     (render-html
      #:code 404
      #:sxml (view-no-latest-revision branch-name)))))

(define (render-branch-package-derivation-history request
                                                  mime-types
                                                  repository-id
                                                  branch-name
                                                  package-name)
  (let ((parsed-query-parameters
         (parse-query-parameters
          request
          `((system  ,(parse-build-system)
                     #:default "x86_64-linux")
            (target  ,parse-target
                     #:default "")))))
    (let ((system
           (assq-ref parsed-query-parameters 'system))
          (target
           (assq-ref parsed-query-parameters 'target)))
      (letpar&
          ((package-derivations
            (with-resource-from-pool (connection-pool) conn
              (package-derivations-for-branch conn
                                              (string->number repository-id)
                                              branch-name
                                              system
                                              target
                                              package-name)))
           (build-server-urls
            (call-with-resource-from-pool (connection-pool)
             select-build-server-urls-by-id)))
        (case (most-appropriate-mime-type
               '(application/json text/html)
               mime-types)
          ((application/json)
           (render-json
            `((derivations . ,(list->vector
                               (map (match-lambda
                                      ((package-version derivation-file-name
                                                        first-guix-revision-commit
                                                        first-datetime
                                                        last-guix-revision-commit
                                                        last-datetime
                                                        builds)
                                       `((version . ,package-version)
                                         (derivation . ,derivation-file-name)
                                         (first_revision
                                          . ((commit . ,first-guix-revision-commit)
                                             (datetime . ,first-datetime)))
                                         (last_revision
                                          . ((commit . ,last-guix-revision-commit)
                                             (datetime . ,last-datetime)))
                                         (builds
                                          . ,(list->vector builds)))))
                                    package-derivations))))))
          (else
           (letpar& ((systems
                      (with-resource-from-pool (connection-pool) conn
                       list-systems))
                     (targets
                      (with-resource-from-pool (connection-pool) conn
                       valid-targets)))
             (render-html
              #:sxml (view-branch-package-derivations
                      parsed-query-parameters
                      repository-id
                      branch-name
                      package-name
                      systems
                      (valid-targets->options targets)
                      build-server-urls
                      package-derivations)))))))))

(define (render-branch-package-output-history request
                                              mime-types
                                              repository-id
                                              branch-name
                                              package-name)
  (let ((parsed-query-parameters
         (parse-query-parameters
          request
          `((output  ,identity
                     #:default "out")
            (system  ,(parse-build-system)
                     #:default "x86_64-linux")
            (target  ,parse-target
                     #:default "")))))
    (let ((system
           (assq-ref parsed-query-parameters 'system))
          (target
           (assq-ref parsed-query-parameters 'target))
          (output-name
           (assq-ref parsed-query-parameters 'output)))
      (letpar&
          ((package-outputs
            (with-resource-from-pool (connection-pool) conn
              (package-outputs-for-branch conn
                                          (string->number repository-id)
                                          branch-name
                                          system
                                          target
                                          package-name
                                          output-name)))
           (build-server-urls
            (call-with-resource-from-pool
             (connection-pool)
             select-build-server-urls-by-id)))
        (case (most-appropriate-mime-type
               '(application/json text/html)
               mime-types)
          ((application/json)
           (render-json
            `((derivations . ,(list->vector
                               (map (match-lambda
                                      ((package-version derivation-file-name
                                                        first-guix-revision-commit
                                                        first-datetime
                                                        last-guix-revision-commit
                                                        last-datetime
                                                        builds)
                                       `((version . ,package-version)
                                         (derivation . ,derivation-file-name)
                                         (first_revision
                                          . ((commit . ,first-guix-revision-commit)
                                             (datetime . ,first-datetime)))
                                         (last_revision
                                          . ((commit . ,last-guix-revision-commit)
                                             (datetime . ,last-datetime)))
                                         (builds
                                          . ,(list->vector builds)))))
                                    package-outputs))))))
          (else
           (letpar& ((systems
                      (with-resource-from-pool (connection-pool) conn
                       list-systems))
                     (targets
                      (with-resource-from-pool (connection-pool) conn
                       valid-targets)))
             (render-html
              #:sxml (view-branch-package-outputs
                      parsed-query-parameters
                      repository-id
                      branch-name
                      package-name
                      output-name
                      systems
                      (valid-targets->options targets)
                      build-server-urls
                      package-outputs)))))))))