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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 compare controller)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-11)
  #:use-module (ice-9 match)
  #:use-module (guix-data-service web util)
  #:use-module (guix-data-service web render)
  #:use-module (guix-data-service web query-parameters)
  #:use-module (guix-data-service model utils)
  #:use-module (guix-data-service comparison)
  #:use-module (guix-data-service model guix-revision)
  #:use-module (guix-data-service model derivation)
  #:use-module (guix-data-service model build-status)
  #:use-module (guix-data-service web compare html)
  #:export (compare-controller))

(define cache-control-default-max-age
  (* 60 60 24)) ; One day

(define http-headers-for-unchanging-content
  `((cache-control
     . (public
        (max-age . ,cache-control-default-max-age)))))

(define (parse-system s)
  s)

(define (parse-build-status s)
  s)

(define (parse-commit conn)
  (lambda (s)
    (if (guix-commit-exists? conn s)
        s
        (make-invalid-query-parameter
         s "unknown commit"))))

(define (compare-controller request
                            method-and-path-components
                            mime-types
                            body
                            conn)
  (match method-and-path-components
    (('GET "compare")
     (let* ((parsed-query-parameters
             (parse-query-parameters
              request
              `((base_commit   ,(parse-commit conn) #:required)
                (target_commit ,(parse-commit conn) #:required)))))
       (render-compare mime-types
                       conn
                       parsed-query-parameters)))
    (('GET "compare-by-datetime")
     (let* ((parsed-query-parameters
             (parse-query-parameters
              request
              `((base_branch     ,identity #:required)
                (base_datetime   ,parse-datetime #:required)
                (target_branch   ,identity #:required)
                (target_datetime ,parse-datetime #:required)))))
       (render-compare-by-datetime mime-types
                                   conn
                                   parsed-query-parameters)))
    (('GET "compare" "derivations")
     (let* ((parsed-query-parameters
             (parse-query-parameters
              request
              `((base_commit   ,(parse-commit conn) #:required)
                (target_commit ,(parse-commit conn) #:required)
                (system        ,parse-system #:multi-value)
                (target        ,parse-system #:multi-value)
                (build_status  ,parse-build-status #:multi-value)))))
       (render-compare/derivations mime-types
                                   conn
                                   parsed-query-parameters)))
    (('GET "compare-by-datetime" "derivations")
     (let* ((parsed-query-parameters
             (guard-against-mutually-exclusive-query-parameters
              (parse-query-parameters
               request
               `((base_branch     ,identity #:required)
                 (base_datetime   ,parse-datetime #:required)
                 (target_branch   ,identity #:required)
                 (target_datetime ,parse-datetime #:required)
                 (system          ,parse-system #:multi-value)
                 (target          ,parse-system #:multi-value)
                 (build_status    ,parse-build-status #:multi-value)))
              '((base_commit base_datetime)
                (target_commit target_datetime)))))
       (render-compare-by-datetime/derivations mime-types
                                               conn
                                               parsed-query-parameters)))
    (('GET "compare" "packages")
     (let* ((parsed-query-parameters
             (parse-query-parameters
              request
              `((base_commit   ,(parse-commit conn) #:required)
                (target_commit ,(parse-commit conn) #:required)))))
       (render-compare/packages mime-types
                                conn
                                parsed-query-parameters)))
    (_ #f)))

(define (render-compare mime-types
                        conn
                        query-parameters)
  (if (any-invalid-query-parameters? query-parameters)
      (case (most-appropriate-mime-type
             '(application/json text/html)
             mime-types)
        ((application/json)
         (render-json
          '((error . "invalid query"))))
        (else
         (render-html
          #:sxml (compare-invalid-parameters
                  query-parameters
                  (match (assq-ref query-parameters 'base_commit)
                    (($ <invalid-query-parameter> value)
                     (select-job-for-commit conn value))
                    (_ #f))
                  (match (assq-ref query-parameters 'target_commit)
                    (($ <invalid-query-parameter> value)
                     (select-job-for-commit conn value))
                    (_ #f))))))

      (let ((base-revision-id (commit->revision-id
                               conn
                               (assq-ref query-parameters 'base_commit)))
            (target-revision-id (commit->revision-id
                                 conn
                                 (assq-ref query-parameters 'target_commit))))
        (let-values
            (((base-packages-vhash target-packages-vhash)
              (package-data->package-data-vhashes
               (package-differences-data conn
                                         base-revision-id
                                         target-revision-id))))
          (let* ((new-packages
                  (package-data-vhashes->new-packages base-packages-vhash
                                                      target-packages-vhash))
                 (removed-packages
                  (package-data-vhashes->removed-packages base-packages-vhash
                                                          target-packages-vhash))
                 (version-changes
                  (package-data-version-changes base-packages-vhash
                                                target-packages-vhash))
                 (lint-warnings-data
                  (group-list-by-first-n-fields
                   2
                   (lint-warning-differences-data conn
                                                  base-revision-id
                                                  target-revision-id))))
            (case (most-appropriate-mime-type
                   '(application/json text/html)
                   mime-types)
              ((application/json)
               (render-json
                `((new-packages . ,(list->vector new-packages))
                  (removed-packages . ,(list->vector removed-packages))
                  (version-changes . ,(list->vector
                                       (map
                                        (match-lambda
                                          ((name data ...)
                                           `((name . ,name)
                                             ,@data)))
                                        version-changes))))
                #:extra-headers http-headers-for-unchanging-content))
              (else
               (render-html
                #:sxml (compare query-parameters
                                (guix-revisions-cgit-url-bases
                                 conn
                                 (list base-revision-id
                                       target-revision-id))
                                new-packages
                                removed-packages
                                version-changes
                                lint-warnings-data)
                #:extra-headers http-headers-for-unchanging-content))))))))

(define (render-compare-by-datetime mime-types
                                    conn
                                    query-parameters)
  (if (any-invalid-query-parameters? query-parameters)
      (case (most-appropriate-mime-type
             '(application/json text/html)
             mime-types)
        ((application/json)
         (render-json
          '((error . "invalid query"))))
        (else
         (render-html
          #:sxml (compare-invalid-parameters
                  query-parameters
                  (match (assq-ref query-parameters 'base_commit)
                    (($ <invalid-query-parameter> value)
                     (select-job-for-commit conn value))
                    (_ #f))
                  (match (assq-ref query-parameters 'target_commit)
                    (($ <invalid-query-parameter> value)
                     (select-job-for-commit conn value))
                    (_ #f))))))

      (let ((base-branch     (assq-ref query-parameters 'base_branch))
            (base-datetime   (assq-ref query-parameters 'base_datetime))
            (target-branch   (assq-ref query-parameters 'target_branch))
            (target-datetime (assq-ref query-parameters 'target_datetime)))
        (let* ((base-revision-details
                (select-guix-revision-for-branch-and-datetime conn
                                                              base-branch
                                                              base-datetime))
               (base-revision-id
                (first base-revision-details))
               (target-revision-details
                (select-guix-revision-for-branch-and-datetime conn
                                                              target-branch
                                                              target-datetime))
               (target-revision-id
                (first target-revision-details)))
          (let-values
              (((base-packages-vhash target-packages-vhash)
                (package-data->package-data-vhashes
                 (package-differences-data conn
                                           base-revision-id
                                           target-revision-id))))
            (let* ((new-packages
                    (package-data-vhashes->new-packages base-packages-vhash
                                                        target-packages-vhash))
                   (removed-packages
                    (package-data-vhashes->removed-packages base-packages-vhash
                                                            target-packages-vhash))
                   (version-changes
                    (package-data-version-changes base-packages-vhash
                                                  target-packages-vhash))
                   (lint-warnings-data
                    (group-list-by-first-n-fields
                     2
                     (lint-warning-differences-data conn
                                                    base-revision-id
                                                    target-revision-id))))
              (case (most-appropriate-mime-type
                     '(application/json text/html)
                     mime-types)
                ((application/json)
                 (render-json
                  `((new-packages . ,(list->vector new-packages))
                    (removed-packages . ,(list->vector removed-packages))
                    (version-changes . ,(list->vector
                                         (map
                                          (match-lambda
                                            ((name data ...)
                                             `((name . ,name)
                                               ,@data)))
                                          version-changes))))
                  #:extra-headers http-headers-for-unchanging-content))
                (else
                 (render-html
                  #:sxml (compare `(,@query-parameters
                                    (base_commit . ,(second base-revision-details))
                                    (target_commit . ,(second target-revision-details)))
                                  (guix-revisions-cgit-url-bases
                                   conn
                                   (list base-revision-id
                                         target-revision-id))
                                  new-packages
                                  removed-packages
                                  version-changes
                                  lint-warnings-data)
                  #:extra-headers http-headers-for-unchanging-content)))))))))

(define (render-compare/derivations mime-types
                                    conn
                                    query-parameters)
  (define (derivations->alist derivations)
    (map (match-lambda
           ((file-name system target buildstatus)
            `((file_name . ,file-name)
              (system . ,system)
              (target . ,target)
              (build_status . ,(if (string=? buildstatus "")
                                   "unknown"
                                   buildstatus)))))
         derivations))

  (if (any-invalid-query-parameters? query-parameters)
      (case (most-appropriate-mime-type
             '(application/json text/html)
             mime-types)
        ((application/json)
         (render-json
          '((error . "invalid query"))))
        (else
         (render-html
          #:sxml (compare/derivations
                  query-parameters
                  (valid-systems conn)
                  build-status-strings
                  '()))))

      (let ((base-commit    (assq-ref query-parameters 'base_commit))
            (target-commit  (assq-ref query-parameters 'target_commit))
            (systems        (assq-ref query-parameters 'system))
            (targets        (assq-ref query-parameters 'target))
            (build-statuses (assq-ref query-parameters 'build_status)))
        (let*
            ((data
              (package-differences-data conn
                                        (commit->revision-id conn base-commit)
                                        (commit->revision-id conn target-commit)
                                        #:systems systems
                                        #:targets targets))
             (names-and-versions
              (package-data->names-and-versions data)))
          (let-values
              (((base-packages-vhash target-packages-vhash)
                (package-data->package-data-vhashes data)))
            (let ((derivation-changes
                   (package-data-derivation-changes names-and-versions
                                                    base-packages-vhash
                                                    target-packages-vhash)))
              (case (most-appropriate-mime-type
                     '(application/json text/html)
                     mime-types)
                ((application/json)
                 (render-json
                  derivation-changes
                  #:extra-headers http-headers-for-unchanging-content))
                (else
                 (render-html
                  #:sxml (compare/derivations
                          query-parameters
                          (valid-systems conn)
                          build-status-strings
                          derivation-changes)
                  #:extra-headers http-headers-for-unchanging-content)))))))))

(define (render-compare-by-datetime/derivations mime-types
                                                conn
                                                query-parameters)
  (define (derivations->alist derivations)
    (map (match-lambda
           ((file-name system target buildstatus)
            `((file_name . ,file-name)
              (system . ,system)
              (target . ,target)
              (build_status . ,(if (string=? buildstatus "")
                                   "unknown"
                                   buildstatus)))))
         derivations))

  (if (any-invalid-query-parameters? query-parameters)
      (case (most-appropriate-mime-type
             '(application/json text/html)
             mime-types)
        ((application/json)
         (render-json
          '((error . "invalid query"))))
        (else
         (render-html
          #:sxml (compare-by-datetime/derivations
                  query-parameters
                  (valid-systems conn)
                  build-status-strings
                  '()))))

      (let ((base-branch     (assq-ref query-parameters 'base_branch))
            (base-datetime   (assq-ref query-parameters 'base_datetime))
            (target-branch   (assq-ref query-parameters 'target_branch))
            (target-datetime (assq-ref query-parameters 'target_datetime))
            (systems         (assq-ref query-parameters 'system))
            (targets         (assq-ref query-parameters 'target))
            (build-statuses  (assq-ref query-parameters 'build_status)))
        (let*
            ((base-revision-details
              (select-guix-revision-for-branch-and-datetime conn
                                                            base-branch
                                                            base-datetime))
             (target-revision-details
              (select-guix-revision-for-branch-and-datetime conn
                                                            target-branch
                                                            target-datetime))
             (data
              (package-differences-data conn
                                        (first base-revision-details)
                                        (first target-revision-details)
                                        #:systems systems
                                        #:targets targets))
             (names-and-versions
              (package-data->names-and-versions data)))
          (let-values
              (((base-packages-vhash target-packages-vhash)
                (package-data->package-data-vhashes data)))
            (let ((derivation-changes
                   (package-data-derivation-changes names-and-versions
                                                    base-packages-vhash
                                                    target-packages-vhash)))
              (case (most-appropriate-mime-type
                     '(application/json text/html)
                     mime-types)
                ((application/json)
                 (render-json
                  derivation-changes
                  #:extra-headers http-headers-for-unchanging-content))
                (else
                 (render-html
                  #:sxml (compare-by-datetime/derivations
                          query-parameters
                          (valid-systems conn)
                          build-status-strings
                          base-revision-details
                          target-revision-details
                          derivation-changes)
                  #:extra-headers http-headers-for-unchanging-content)))))))))

(define (render-compare/packages mime-types
                                 conn
                                 query-parameters)
  (define (package-data-vhash->json vh)
    (delete-duplicates
     (vhash-fold (lambda (name data result)
                   (cons `((name . ,name)
                           (version . ,(car data)))
                         result))
                 '()
                 vh)))

  (if (any-invalid-query-parameters? query-parameters)
      (case (most-appropriate-mime-type
             '(application/json text/html)
             mime-types)
        ((application/json)
         (render-json
          '((error . "invalid query"))))
        (else
         (render-html
          #:sxml (compare-invalid-parameters
                  query-parameters
                  (match (assq-ref query-parameters 'base_commit)
                    (($ <invalid-query-parameter> value)
                     (select-job-for-commit conn value))
                    (_ #f))
                  (match (assq-ref query-parameters 'target_commit)
                    (($ <invalid-query-parameter> value)
                     (select-job-for-commit conn value))
                    (_ #f))))))

      (let ((base-commit    (assq-ref query-parameters 'base_commit))
            (target-commit  (assq-ref query-parameters 'target_commit)))
        (let ((base-revision-id (commit->revision-id conn base-commit))
              (target-revision-id (commit->revision-id conn target-commit)))

          (let-values
              (((base-packages-vhash target-packages-vhash)
                (package-data->package-data-vhashes
                 (package-differences-data conn
                                           base-revision-id
                                           target-revision-id))))
            (case (most-appropriate-mime-type
                   '(application/json text/html)
                   mime-types)
              ((application/json)
               (render-json
                `((base
                   . ((commit . ,base-commit)
                      (packages . ,(list->vector
                                    (package-data-vhash->json base-packages-vhash)))))
                  (target
                   . ((commit . ,target-commit)
                      (packages . ,(list->vector
                                    (package-data-vhash->json target-packages-vhash))))))
                #:extra-headers http-headers-for-unchanging-content))
              (else
               (render-html
                #:sxml (compare/packages
                        query-parameters
                        base-packages-vhash
                        target-packages-vhash)
                #:extra-headers http-headers-for-unchanging-content))))))))