;; scrumli --- A simple scrum web application
;; Copyright (C) 2013  Tom Willemse

;; scrumli 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.

;; scrumli 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 scrumli.  If not, see <http://www.gnu.org/licenses/>.

(in-package #:scrumli)

(defvar *scrumli-host* "http://localhost:5000"
  "The host currently running Scrumli. Used by Mozilla Persona.")

(defvar *scrumli-bootstrap-css-location*
  "//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.no-icons.min.css"
  "The location of the twitter bootstrap CSS file.")

(defvar *scrumli-bootstrap-js-location*
  "//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/js/bootstrap.min.js"
  "The location of the twitter bootstrap JS file.")

(defvar *scrumli-font-awesome-css-location*
  "//netdna.bootstrapcdn.com/font-awesome/3.1.1/css/font-awesome.min.css"
  "The location of the font awesome CSS file.")

(defvar *scrumli-jquery-js-location*
  "//code.jquery.com/jquery-2.0.0.min.js"
  "The location of the jQuery JS file.")

(defvar *scrumli-react-js-location*
  "//cdnjs.cloudflare.com/ajax/libs/react/0.3.2/react.min.js"
  "The location of the React JS file.")

(defvar *scrumli-jsxtransformer-js-location*
  "//cdnjs.cloudflare.com/ajax/libs/react/0.3.2/JSXTransformer.js"
  "The location of the JSX Transformer JS file.")

(defun logged-in-p ()
  (gethash :username (getf (env *request*) :clack.session)))

(defun page-title (title)
  (concatenate 'string title " | scrumli"))

(defun md5-hash (str)
  (string-downcase (format nil "~{~2,'0x~}"
                           (coerce (md5:md5sum-string str) 'list))))

(defun verify-credentials (audience assertion)
  (let ((response
         (http-request "https://verifier.login.persona.org/verify"
                       :method :post :content-type "application/json"
                       :content (encode-json-to-string
                                 `(("assertion" . ,assertion)
                                   ("audience" . ,audience)))
                       :want-stream t)))
    (decode-json response)))

(defclass scrumli-app (<app>) ())

(defvar *app* (make-instance 'scrumli-app))

(defun make-tpl-parameters (&rest args)
  (append (list :prefix (script-name *request*)) args))

(defun story-list-page (params)
  (declare (ignore params))
  (if (logged-in-p)
      (scrumli-templates:main
       (make-tpl-parameters
        :title (page-title "Backlog")
        :csss (list *scrumli-bootstrap-css-location*
                    *scrumli-font-awesome-css-location*
                    (concatenate 'string (script-name *request*)
                                 "static/css/scrumli.css"))
        :jss (list *scrumli-jquery-js-location*
                   *scrumli-bootstrap-js-location*
                   *scrumli-react-js-location*
                   *scrumli-jsxtransformer-js-location*
                   (concatenate 'string (script-name *request*)
                                "js/bridge.js"))
        :username (gethash :username (getf (env *request*)
                                           :clack.session))
        :usermd5 (md5-hash (gethash :username (getf (env *request*)
                                                    :clack.session)))
        :ulogout (concatenate 'string (script-name *request*) "logout")
        :umainjs (concatenate 'string (script-name *request*)
                              "static/js/main.js")))
      (redirect *response*
                (concatenate 'string (script-name *request*)
                             "login"))))

(defun login-page (params)
  (declare (ignore params))
  (if (not (logged-in-p))
      (scrumli-templates:login
       (make-tpl-parameters
        :title (page-title "Login")
        :csss (list *scrumli-bootstrap-css-location*
                    *scrumli-font-awesome-css-location*)
        :jss (list *scrumli-bootstrap-js-location*
                   "https://login.persona.org/include.js"
                   (concatenate 'string (script-name *request*)
                                "js/bridge.js")
                   (concatenate 'string (script-name *request*)
                                "static/js/login.js"))))
      (redirect *response* (if (equal (script-name *request*) "")
                               "/" (script-name *request*)))))

(defun login-page/post (params)
  (let ((result (verify-credentials
                 *scrumli-host* (getf params :|assertion|))))
    (if (equal (cdr (assoc :status result)) "okay")
        (progn
          (setf (gethash :username
                         (getf (env *request*) :clack.session))
                (cdr (assoc :email result)))
          (redirect *response*
                    (if (equal (script-name *request*) "")
                        "/" (script-name *request*))))
        '(403))))

(defun logout (params)
  (declare (ignore params))
  (if (logged-in-p)
      (setf (gethash :username
                     (getf (env *request*) :clack.session)) nil))
  (redirect *response* (concatenate 'string (script-name *request*)
                                    "login")))

(defun stories-json (params)
  (declare (ignore params))
  (if (logged-in-p)
      (list 200 '(:content-type "text/json")
            (encode-json-to-string (get-all-stories)))
      '(403)))

(defun user-stories-json (params)
  (declare (ignore params))
  (if (logged-in-p)
      (list 200 '(:content-type "text/json")
            (encode-json-to-string
             (get-stories-for
              (gethash
               :username (getf (env *request*) :clack.session)))))
      '(403)))

(defun add-story-json/post (params)
  (if (logged-in-p)
      (let ((role (getf params :|role|))
            (necessity (getf params :|necessity|))
            (headline (getf params :|headline|))
            (content (getf params :|content|)))
        (post-story
         role necessity headline content
         (gethash :username (getf (env *request*) :clack.session)))
        (list 200 '(:content-type "text/json")
              (encode-json-to-string '((status . "ok")))))
      '(403)))

(defun add-task-json/post (params)
  (if (logged-in-p)
      (let ((story-id (getf params :|storyId|))
            (description (getf params :|description|)))
        (post-task
         story-id description
         (gethash :username (getf (env *request*) :clack.session)))
        (list 200 '(:content-type "text/json")
              (encode-json-to-string '((status . "ok")))))
      '(403)))

(defun story-set-state-json/post (params)
  (if (logged-in-p)
      (let* ((id (getf params :|id|))
             (current-state (story-get-state 'story id))
             (next (ecase (intern current-state :scrumli)
                     (todo "DOING")
                     (doing "DONE")
                     (done "TODO"))))
        (story-set-state 'story id next)
        (list 200 '(:content-type "text/json")
              (encode-json-to-string `((status . "ok")
                                       (state . ,next)))))
      '(403)))

(defun task-set-state-json/post (params)
  (if (logged-in-p)
      (let* ((id (getf params :|id|))
             (current-state (story-get-state 'task id))
             (next (ecase (intern current-state :scrumli)
                     (todo "DOING")
                     (doing "DONE")
                     (done "TODO"))))
        (story-set-state 'task id next)
        (list 200 '(:content-type "text/json")
              (encode-json-to-string `((status . "ok")
                                       (state . ,next)))))
      '(403)))

(defun story-move-json/post (params)
  (if (logged-in-p)
      (let ((id (getf params :|id|))
            (dir (getf params :dir)))
        (story-change-priority id (intern (string-upcase dir) :keyword))
        (list 200 '(:content-type "text/json")
              (encode-json-to-string '((status . "ok")))))
      '(403)))

(defun task-move-json/post (params)
  (if (logged-in-p)
      (let ((id (getf params :|id|))
            (dir (getf params :dir)))
        (task-change-priority id (intern (string-upcase dir) :keyword))
        (list 200 '(:content-type "text/json")
              (encode-json-to-string '((status . "ok")))))
      '(403)))

(defun story-json (params)
  (if (logged-in-p)
      (list 200 '(:content-type "text/json")
            (encode-json-to-string (get-story (getf params :id))))
      '(403)))

(defun story-set-assignee/post (params)
  (if (logged-in-p)
      (progn
        (set-assignee 'story (getf params :|id|)
                      (getf params :|assignee|))
        (list 200 '(:content-type "text/json")
              (encode-json-to-string '((status . "ok")))))
      '(403)))

(defun task-set-assignee/post (params)
  (if (logged-in-p)
      (progn
        (set-assignee 'task (getf params :|id|)
                      (getf params :|assignee|))
        (list 200 '(:content-type "text/json")
              (encode-json-to-string '((status . "ok")))))
      '(403)))

(defun lisp->js-bridge (params)
  (declare (ignore params))
  (list 200 '(:content-type "text/javascript")
        (ps (var base-url (lisp (if (equal (script-name *request*) "")
                                    "/" (script-name *request*)))))))

(setf (route *app* "/") #'story-list-page)
(setf (route *app* "/login") #'login-page)
(setf (route *app* "/login" :method :post) #'login-page/post)
(setf (route *app* "/logout") #'logout)
(setf (route *app* "/stories") #'stories-json)
(setf (route *app* "/stories/mine") #'user-stories-json)
(setf (route *app* "/stories/new" :method :post) #'add-story-json/post)
(setf (route *app* "/stories/tasks/new" :method :post) #'add-task-json/post)
(setf (route *app* "/stories/state" :method :post) #'story-set-state-json/post)
(setf (route *app* "/tasks/state" :method :post) #'task-set-state-json/post)
(setf (route *app* "/stories/:dir" :method :post) #'story-move-json/post)
(setf (route *app* "/tasks/:dir" :method :post) #'task-move-json/post)
(setf (route *app* "/stories/:id") #'story-json)
(setf (route *app* "/story/assignee" :method :post) #'story-set-assignee/post)
(setf (route *app* "/task/assignee" :method :post) #'task-set-assignee/post)
(setf (route *app* "/js/bridge.js") #'lisp->js-bridge)

(defun get-app ()
  (builder
   (<clack-middleware-static>
    :path "/static/"
    :root (merge-pathnames #P"static/" scrumli-config:*base-directory*))
   (<clack-middleware-session>
    :state (make-instance 'clack.session.state.cookie:<clack-session-state-cookie>))
   (<clack-middleware-postmodern>
    :database "scrumli" :user "slash" :password nil :host "localhost")
   *app*))