(in-package :cl-user)
(defpackage chatikbot.plugins.ledger
  (:use :cl :chatikbot.common))
(in-package :chatikbot.plugins.ledger)

(eval-when (:compile-toplevel :load-toplevel :execute)
  (ql:quickload '(:pta-ledger :legit)))

(defsetting *ledger/default-timezone* -3 "Default timezone for time display. GMT+3")
(defvar *ledger/chat-journals* (make-hash-table))

(defvar *git-repo-locks* (make-hash-table :test #'equal))
(defun git-get-repo-lock (repo)
  (let ((key (legit:location repo)))
    (setf key
          (etypecase key
            (string key)
            (pathname (namestring key))))
    (or (gethash key *git-repo-locks*)
        (setf (gethash key *git-repo-locks*)
              (bt:make-recursive-lock key)))))

(defun git-get-repo (location remote)
  (let ((repo (make-instance 'legit:repository :location location)))
    (bt:with-recursive-lock-held ((git-get-repo-lock repo))
      (legit:init repo :remote remote :if-does-not-exist :clone))
    repo))

(defsetting *git-repos-root* "/tmp/ledger-repos/")
(defun git-get-chat-location (chat-id remote)
  (namestring (uiop:ensure-directory-pathname
               (merge-pathnames (format nil "~A-~A" chat-id (token-hmac remote))
                                *git-repos-root*))))

(defun git-read-latest-file (repo path)
  (bt:with-recursive-lock-held ((git-get-repo-lock repo))
    (legit:fetch repo :branch "master" :remote "origin")
    (legit:reset repo :hard t :to "origin/master")
    (uiop:read-file-string (merge-pathnames path (legit:location repo)))))

(defun ledger/refresh-git (chat-id remote path)
  (let* ((location (git-get-chat-location chat-id remote))
         (repo (git-get-repo location remote))
         (content (git-read-latest-file repo path))
         (journal (pta-ledger:parse-journal content))
         (updated (legit:current-age repo)))
    (setf (gethash chat-id *ledger/chat-journals*)
          (cons journal updated))))

(defun git-append-latest-file (repo path text message)
  (bt:with-recursive-lock-held ((git-get-repo-lock repo))
    (let ((repo-path (merge-pathnames path (legit:location repo))))
      (dotimes (tries 5)
        (let ((current (or (ignore-errors (git-read-latest-file repo path)) "")))
          (uiop/stream:with-output-file (s repo-path
                                           :if-exists :supersede
                                           :if-does-not-exist :create)
            (format s "~A~A" current text)))
        (legit:add repo (namestring repo-path))
        (legit:commit repo message)
        (handler-case
            (progn
              (legit:push repo)
              (return-from git-append-latest-file path))
          (legit:git-error ())))
      (error "Tried 5 times to push ~A to ~A" path (legit:remote-url repo)))))

(defun ledger/add-git (chat-id remote path text message)
  (let* ((location (git-get-chat-location chat-id remote))
         (repo (git-get-repo location remote)))
    (git-append-latest-file repo path
                            (format nil "~%~A~%" text)
                            message)))

(defun ledger/get-hook-url (chat-id)
  (get-webhook-url "ledger" chat-id (token-hmac (write-to-string chat-id))))

(defun ledger/format-uri (url)
  (let ((uri (quri:uri url)))
    (quri:render-uri (quri:make-uri :userinfo (when (quri:uri-userinfo uri) "*:*")
                                    :defaults url))))

(defun ledger/format-time (universal-time)
  (when universal-time
    (multiple-value-bind (sec min hour day month year dow dst-p tz)
        (decode-universal-time universal-time *ledger/default-timezone*)
      (declare (ignore dow dst-p tz))
      (format nil "~4,'0D-~2,'0D-~2,'0D ~2,'0D:~2,'0D:~2,'0D"
              year month day hour min sec))))

(defun format-date (ut)
  (multiple-value-bind (sec min hour day month year)
      (decode-universal-time ut)
    (declare (ignore sec min hour))
    (format nil "~4,'0D-~2,'0D-~2,'0D"
            year month day)))

(defun get-year (ut)
  (multiple-value-bind (sec min hour day month year)
      (decode-universal-time ut)
    (declare (ignore sec min hour day month))
    year))

(defun ledger/refresh-uri (chat-id uri)
  (setf (gethash chat-id *ledger/chat-journals*)
        (cons (pta-ledger:parse-journal (http-request uri))
              (get-universal-time))))

(defun get-chat-journal-info (chat-id &optional info)
  (labels ((process-info (info)
             (cond
               ((stringp info) (ledger/refresh-uri chat-id info))
               ((consp info) (apply #'ledger/refresh-git chat-id info))
               (:otherwise nil))))
    (let ((journal-info (gethash chat-id *ledger/chat-journals*)))
      (if journal-info journal-info
          (if info (process-info info)
              (with-secret (info (list :ledger chat-id))
                (process-info info)))))))

(Defun ledger/handle-info (chat-id)
  (with-secret (info (list :ledger chat-id))
    (if info
        (destructuring-bind (journal . ut)
            (get-chat-journal-info chat-id info)
          (let ((uri (cond
                       ((consp info) (car info))
                       ((stringp info) info))))
            (bot-send-message chat-id (format nil "Журнал с ~D записями, из ~A, обновлён ~A.~%Веб-хук: ~A"
                                              (length journal)
                                              (ledger/format-uri uri)
                                              (ledger/format-time ut)
                                              (ledger/get-hook-url chat-id))
                              :disable-web-preview t)))
        (bot-send-message chat-id "Добавь журнал: uri - /ledger <url>; git - /ledger <remote> <path>"))))

(defun ledger/handle-set-info (chat-id info)
  (setf (gethash chat-id *ledger/chat-journals*) nil)
  (handler-case
      (destructuring-bind (journal . ut)
          (get-chat-journal-info chat-id info)
        (declare (ignore ut))
        (secret-set (list :ledger chat-id) info)
        (bot-send-message chat-id (format nil "Добавил журнал с ~D записями. Веб-хук для обновления: ~A"
                                       (length journal)
                                       (ledger/get-hook-url chat-id))))
    (pta-ledger:journal-failed (e)
      (bot-send-message chat-id (format nil "Не смог спарсить: ~A" e)))
    (dex:http-request-failed (e)
      (bot-send-message chat-id (format nil "Не смог в урл: ~A" (dex:response-body e))))))


(def-message-cmd-handler handler-ledger (:ledger)
  (cond
    ((<= 1 (length args) 2) (ledger/handle-set-info chat-id args))
    (:otherwise (ledger/handle-info chat-id))))

(defmacro with-chat-journal ((chat-id journal updated) &body body)
  (let ((info (gensym "info")))
    `(let ((,info (get-chat-journal-info ,chat-id)))
       (if ,info
           (destructuring-bind (,journal . ,updated) ,info
             (declare (ignorable ,journal ,updated))
             ,@body)
           (bot-send-message ,chat-id "Добавь журнал: uri - /ledger <url>; git - /ledger <remote> <path>")))))

(defun ledger/handle-balance (chat-id query)
  (with-chat-journal (chat-id journal updated)
    (bot-send-message chat-id (format nil "```~%~A~%```Обновлено: ~A"
                                      (pta-ledger:journal-balance journal query)
                                      (ledger/format-time updated))
                              :parse-mode "markdown")))

(def-message-cmd-handler handler-balance (:balance :bal)
  (cond
    ((null args) (ledger/handle-balance chat-id "assets"))
    (:otherwise (ledger/handle-balance chat-id (spaced args)))))

(defun ledger/handle-journal (chat-id query)
  (with-chat-journal (chat-id journal updated)
    (let* ((pta-ledger:*posting-length* 40)
           (entries (pta-ledger:journal-print journal query))
           (len (length entries))
           (count (min len 20)))
      (bot-send-message chat-id (format nil "```~%~{~A~^ ~%~%~}```Обновлено: ~A"
                                        (subseq entries (- len count) len)
                                        (ledger/format-time updated))
                        :parse-mode "markdown"))))

(def-message-cmd-handler handler-journal (:journal)
  (cond
    ((null args) (ledger/handle-journal chat-id "date:thisweek"))
    (:otherwise (ledger/handle-journal chat-id (spaced args)))))

(defun match-entry (text journal)
  (labels ((two-post (entries)
             (remove-if-not #'(lambda (e)
                                (= 2 (length (pta-ledger:entry-postings e))))
                            entries)))
    (let ((desc (two-post
                 (pta-ledger:journal-entries journal (format nil "desc:'~A'" text)))))
      (if desc (car (last desc))
          (let ((comment (two-post
                          (pta-ledger:journal-entries journal (format nil "comment:'~A'" text)))))
            (when comment (car (last comment))))))))

(defun create-entry (chat-id text amount currency)
  (with-chat-journal (chat-id journal updated)
    (let* ((old (match-entry text journal))
           (new (or (when old (pta-ledger:clone-entry old))
                    (pta-ledger:make-entry
                     :description text
                     :postings (list
                                (pta-ledger:make-posting :account "expenses")
                                (pta-ledger:make-posting)))))
           (postings (pta-ledger:entry-postings new)))
      (setf (pta-ledger:entry-date new) (get-universal-time)
            (pta-ledger:posting-amount (car postings)) (pta-ledger:make-amount
                                                        :quantity amount
                                                        :commodity currency)
            (pta-ledger:posting-amount (cadr postings)) (pta-ledger:make-amount
                                                         :quantity (- amount)
                                                         :commodity currency)
            (pta-ledger:posting-account (cadr postings)) (format nil "assets:Cash:~A" currency))
      new)))

(def-message-cmd-handler handler-create (:rub :usd :eur :thb :btc)
  (cond
    ((>= (length args) 2)
     (ledger/new-chat-entry chat-id (create-entry chat-id
                                                  (spaced (subseq args 1))
                                                  (parse-float (car args))
                                                  (symbol-name cmd))))
    (:otherwise (bot-send-message chat-id (format nil "/~A <amount> <description>" cmd)))))

(def-webhook-handler ledger/handle-webhook ("ledger")
  (when (= 2 (length paths))
    (destructuring-bind (chat-id hmac) paths
      (let ((true-hmac (token-hmac chat-id)))
        (when (string= true-hmac hmac)
          (with-secret (info (list :ledger chat-id))
            (when info
              (let ((chat-id (parse-integer chat-id)))
                (log:info "Updating ledger for ~A" chat-id)
                (setf (gethash chat-id *ledger/chat-journals*) nil)
                (get-chat-journal-info chat-id info)
                "OK"))))))))

;; New entries
(defun format-entry (entry)
  (let ((pta-ledger:*posting-length* 40))
    (format nil "```~%~A```" (pta-ledger:render entry))))

(defun ledger/format-add-entry-message (from)
  (format nil "Ledger add from ~A ~A at ~A"
          (aget "first_name" from) (aget "last_name" from)
          (ledger/format-time (get-universal-time))))

(defun ledger/process-add-entry (chat-id from entry)
  (with-secret (info (list :ledger chat-id))
    (if info
        (cond
          ((consp info)
           (handler-case (progn
                           (ledger/add-git
                            chat-id
                            (car info) (cadr info)
                            (pta-ledger:render entry)
                            (ledger/format-add-entry-message from))
                           "Добавил!")
             (error (e)
               (log:error "~A" e)
               "Не смог :(")))
          (:otherwise "Добавляю только в git журнал :("))
        "Добавь git журнал.")))

(defun ledger/new-chat-entry (chat-id entry)
  (bot-send-message
   chat-id (format-entry entry)
   :parse-mode "markdown"
   :reply-markup (keyboard/entry chat-id entry)))

(defun entry-edit (chat-id message-id entry)
  (telegram-edit-message-text
   (format-entry entry)
   :chat-id chat-id :message-id message-id
   :parse-mode "markdown"
   :reply-markup (keyboard/edit-entry chat-id entry)))

(defun keyboard/entry (chat-id entry)
  (get-inline-keyboard
   chat-id
   (list
    (list (inline-button ("➕")
            (telegram-answer-callback-query query-id :text "Добавляю...")
            (telegram-send-message source-chat-id (ledger/process-add-entry
                                                   source-chat-id from entry))
            (telegram-edit-message-reply-markup
             nil :chat-id source-chat-id :message-id source-message-id))
          (inline-button ("💲")
            (entry-edit source-chat-id source-message-id entry))
          (inline-button ("✖️")
            (telegram-delete-message source-chat-id source-message-id))))))

(defun def (str default)
  (if (or (null str) (string= "" str)) default
      str))

(defun keyboard/edit-entry (chat-id entry)
  (get-inline-keyboard
   chat-id
   (append
    (list
     (list (inline-button ((format-date (pta-ledger:entry-date entry)))
             (bot-send-message chat-id "Введите дату"
                               :reply-markup (telegram-force-reply))
             (on-next-message chat-id
               (let ((date (pta-ledger:parse-date text (get-year
                                                        (pta-ledger:entry-date entry)))))
                 (if date
                     (progn
                       (setf (pta-ledger:entry-date entry) date)
                       (entry-edit chat-id source-message-id entry))
                     (bot-send-message chat-id "Не разобрал")))))
           (inline-button ((def (pta-ledger:entry-description entry) "Описание"))
             (bot-send-message chat-id "Введите описание"
                               :reply-markup (telegram-force-reply))
             (on-next-message chat-id
               (setf (pta-ledger:entry-description entry) text)
               (entry-edit chat-id source-message-id entry)))
           (inline-button ((def (pta-ledger:entry-comment entry) "Коммент"))
             (bot-send-message chat-id "Введите комментарий"
                               :reply-markup (telegram-force-reply))
             (on-next-message chat-id
               (setf (pta-ledger:entry-comment entry) text)
               (entry-edit chat-id source-message-id entry)))))
    (loop for posting in (pta-ledger:entry-postings entry)
       collect
         (let ((this-posting posting))
           (list (inline-button ((pta-ledger:posting-account posting))
                   (account-edit chat-id source-message-id entry this-posting
                                 (pta-ledger:posting-account this-posting)))
                 (inline-button ((def (pta-ledger:render
                                       (pta-ledger:posting-amount posting))
                                     "Сумма"))
                   (bot-send-message chat-id "Введите сумму"
                                     :reply-markup (telegram-force-reply))
                   (on-next-message chat-id
                     (let ((amount (pta-ledger:parse-amount text)))
                       (setf (pta-ledger:posting-amount this-posting) amount)
                       (entry-edit chat-id source-message-id entry)))))))
    (list (list (inline-button ("Готово")
                  (telegram-edit-message-reply-markup
                   (keyboard/entry chat-id entry)
                   :chat-id chat-id :message-id source-message-id)))))))

(defun accounts/nav (account accounts &optional (offset 0) (count 5))
  (let* ((len (1+ (length account)))
         (sep-pos (position #\: account :from-end t))
         (parent (when sep-pos (subseq account 0 sep-pos)))
         (head (when account (concatenate 'string account ":")))
         (descendants (remove-if #'(lambda (a)
                                     (when head
                                       (not (equal head
                                                   (subseq a 0 (min (length a) len))))))
                                 accounts)))
    (if descendants
        (let* ((children (sort (remove-duplicates
                                (mapcar #'(lambda (d)
                                            (subseq d 0 (or (position #\: d :start len)
                                                            (length d))))
                                        descendants)
                                :test #'equal) #'string<))
               (total (length children)))
          (when (stringp offset)
            (let ((off (position offset children :test #'equal)))
              (setf offset (if off (max 0 (- off (round count 2))) 0))))
          (values account parent
                  (mapcar
                   #'(lambda (c)
                       (let* ((needle (concatenate 'string c ":"))
                              (n-l (length needle)))
                         (cons c
                               (not
                                (find needle accounts :test #'equal
                                      :key #'(lambda (a)
                                               (subseq a 0 (min n-l (length a)))))))))
                   (subseq children offset
                           (min total (+ offset count))))
                  (unless (zerop offset) (max 0 (- offset count)))
                  (when (< (+ offset count) total) (+ offset count))))
        (when parent (accounts/nav parent accounts account)))))

(defun account-edit (chat-id message-id entry posting account &optional (offset 0))
  (with-chat-journal (chat-id journal updated)
    (let* ((accounts (pta-ledger:journal-accounts journal))
           (nav-list (multiple-value-list
                      (accounts/nav account accounts offset))))
      (telegram-edit-message-reply-markup
       (apply #'keyboard/account chat-id entry posting nav-list)
       :chat-id chat-id :message-id message-id))))

(defun keyboard/account (chat-id entry posting account parent children prev next)
  (get-inline-keyboard
   chat-id
   (append
    (list (list (when account
                  (inline-button (account)
                    (setf (pta-ledger:posting-account posting) account)
                    (entry-edit chat-id source-message-id entry)))
                (inline-button ("Ввести")
                  (bot-send-message chat-id "Введите счёт"
                                    :reply-markup (telegram-force-reply))
                  (on-next-message chat-id
                    (let ((account (pta-ledger:parse-account text)))
                      (if account
                          (progn
                            (setf (pta-ledger:posting-account posting) account)
                            (entry-edit chat-id source-message-id entry))
                          (bot-send-message chat-id "Не разобрал")))))))
    (loop for (acc . leaf) in children
       collect (let ((this-account acc))
                 (list (if leaf
                           (inline-button (this-account)
                             (setf (pta-ledger:posting-account posting) this-account)
                             (entry-edit chat-id source-message-id entry))
                           (inline-button ((format nil "~A ..." this-account))
                             (account-edit chat-id source-message-id entry posting
                                           this-account))))))
    (list (list (when prev
                  (inline-button ("<<")
                    (account-edit chat-id source-message-id entry posting
                                  account prev)))
                (when (or parent account)
                  (inline-button ((or parent "ACC"))
                    (account-edit chat-id source-message-id entry posting
                                  parent account)))
                (when next
                  (inline-button (">>")
                    (account-edit chat-id source-message-id entry posting
                                  account next))))))))