;;; erc-tests.el --- Tests for erc.  -*- lexical-binding:t -*-

;; Copyright (C) 2020-2022 Free Software Foundation, Inc.

;; Author: Lars Ingebrigtsen <larsi@gnus.org>

;; This file is part of GNU Emacs.

;; GNU Emacs 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 Emacs 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 Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Code:

(require 'ert-x)
(require 'erc)
(require 'erc-ring)
(require 'erc-networks)

(ert-deftest erc--read-time-period ()
  (cl-letf (((symbol-function 'read-string) (lambda (&rest _) "")))
    (should (equal (erc--read-time-period "foo: ") nil)))

  (cl-letf (((symbol-function 'read-string) (lambda (&rest _) "   ")))
    (should (equal (erc--read-time-period "foo: ") nil)))

  (cl-letf (((symbol-function 'read-string) (lambda (&rest _) " 432 ")))
    (should (equal (erc--read-time-period "foo: ") 432)))

  (cl-letf (((symbol-function 'read-string) (lambda (&rest _) "432")))
    (should (equal (erc--read-time-period "foo: ") 432)))

  (cl-letf (((symbol-function 'read-string) (lambda (&rest _) "1h")))
    (should (equal (erc--read-time-period "foo: ") 3600)))

  (cl-letf (((symbol-function 'read-string) (lambda (&rest _) "1h10s")))
    (should (equal (erc--read-time-period "foo: ") 3610)))

  (cl-letf (((symbol-function 'read-string) (lambda (&rest _) "1d")))
    (should (equal (erc--read-time-period "foo: ") 86400))))

(ert-deftest erc--meta--backend-dependencies ()
  (with-temp-buffer
    (insert-file-contents-literally
     (concat (file-name-sans-extension (symbol-file 'erc)) ".el"))
    (let ((beg (search-forward ";; Defined in erc-backend"))
          (end (search-forward "\n\n"))
          vars)
      (save-excursion
        (save-restriction
          (narrow-to-region beg end)
          (goto-char (point-min))
          (with-syntax-table lisp-data-mode-syntax-table
            (condition-case _
                (while (push (cadr (read (current-buffer))) vars))
              (end-of-file)))))
      (should (= (point) end))
      (dolist (var vars)
        (setq var (concat "\\_<" (symbol-name var) "\\_>"))
        (ert-info (var)
          (should (save-excursion (search-forward-regexp var nil t))))))))

(ert-deftest erc-with-all-buffers-of-server ()
  (let (proc-exnet
        proc-onet
        erc-kill-channel-hook erc-kill-server-hook erc-kill-buffer-hook)

    (with-current-buffer (get-buffer-create "OtherNet")
      (erc-mode)
      (setq proc-onet (start-process "sleep" (current-buffer) "sleep" "1")
            erc-server-process proc-onet
            erc-network 'OtherNet)
      (set-process-query-on-exit-flag erc-server-process nil))

    (with-current-buffer (get-buffer-create "ExampleNet")
      (erc-mode)
      (setq proc-exnet (start-process "sleep" (current-buffer) "sleep" "1")
            erc-server-process proc-exnet
            erc-network 'ExampleNet)
      (set-process-query-on-exit-flag erc-server-process nil))

    (with-current-buffer (get-buffer-create "#foo")
      (erc-mode)
      (setq erc-server-process proc-exnet)
      (setq erc-default-recipients '("#foo")))

    (with-current-buffer (get-buffer-create "#spam")
      (erc-mode)
      (setq erc-server-process proc-onet)
      (setq erc-default-recipients '("#spam")))

    (with-current-buffer (get-buffer-create "#bar")
      (erc-mode)
      (setq erc-server-process proc-onet)
      (setq erc-default-recipients '("#bar")))

    (with-current-buffer (get-buffer-create "#baz")
      (erc-mode)
      (setq erc-server-process proc-exnet)
      (setq erc-default-recipients '("#baz")))

    (should (eq (get-buffer-process "ExampleNet") proc-exnet))
    (erc-with-all-buffers-of-server (get-buffer-process "ExampleNet")
      nil
      (kill-buffer))

    (should-not (get-buffer "ExampleNet"))
    (should-not (get-buffer "#foo"))
    (should-not (get-buffer "#baz"))
    (should (get-buffer "OtherNet"))
    (should (get-buffer "#bar"))
    (should (get-buffer "#spam"))

    (let* ((test (lambda () (not (string= (buffer-name) "#spam"))))
           (calls 0)
           (get-test (lambda () (cl-incf calls) test)))

      (erc-with-all-buffers-of-server proc-onet
        (funcall get-test)
        (kill-buffer))

      (should (= calls 1)))

    (should-not (get-buffer "OtherNet"))
    (should-not (get-buffer "#bar"))
    (should (get-buffer "#spam"))
    (kill-buffer "#spam")))

(defun erc-tests--send-prep ()
  ;; Caller should probably shadow `erc-insert-modify-hook' or
  ;; populate user tables for erc-button.
  (erc-mode)
  (insert "\n\n")
  (setq erc-input-marker (make-marker)
        erc-insert-marker (make-marker))
  (set-marker erc-insert-marker (point-max))
  (erc-display-prompt)
  (should (= (point) erc-input-marker)))

(defun erc-tests--set-fake-server-process (&rest args)
  (setq erc-server-process
        (apply #'start-process (car args) (current-buffer) args))
  (set-process-query-on-exit-flag erc-server-process nil))

(ert-deftest erc--switch-to-buffer ()
  (defvar erc-modified-channels-alist) ; lisp/erc/erc-track.el

  (let ((proc (start-process "aNet" (current-buffer) "true"))
        (erc-modified-channels-alist `(("fake") (,(messages-buffer))))
        (inhibit-message noninteractive)
        (completion-fail-discreetly t) ; otherwise ^G^G printed to .log file
        ;;
        erc-kill-channel-hook erc-kill-server-hook erc-kill-buffer-hook)

    (with-current-buffer (get-buffer-create "server")
      (erc-mode)
      (set-process-buffer (setq erc-server-process proc) (current-buffer))
      (set-process-query-on-exit-flag erc-server-process nil)
      (with-current-buffer (get-buffer-create "#chan")
        (erc-mode)
        (setq erc-server-process proc))
      (with-current-buffer (get-buffer-create "#foo")
        (erc-mode)
        (setq erc-server-process proc))

      (ert-info ("Channel #chan selectable from server buffer")
        (ert-simulate-keys (list ?# ?c ?h ?a ?n ?\C-m)
          (should (string= "#chan" (erc--switch-to-buffer))))))

    (ert-info ("Channel #foo selectable from non-ERC buffer")
      (ert-simulate-keys (list ?# ?f ?o ?o ?\C-m)
        (should (string= "#foo" (erc--switch-to-buffer)))))

    (ert-info ("Default selectable")
      (ert-simulate-keys (list ?\C-m)
        (should (string= "*Messages*" (erc--switch-to-buffer)))))

    (ert-info ("Extant but non-ERC buffer not selectable")
      (get-buffer-create "#fake") ; not ours
      (ert-simulate-keys (kbd "#fake C-m C-a C-k C-m")
        ;; Initial query fails ~~~~~~^; clearing input accepts default
        (should (string= "*Messages*" (erc--switch-to-buffer)))))

    (with-current-buffer (get-buffer-create "other")
      (erc-mode)
      (setq erc-server-process (start-process "bNet" (current-buffer) "true"))
      (set-process-query-on-exit-flag erc-server-process nil))

    (ert-info ("Foreign ERC buffer not selectable")
      (ert-simulate-keys (kbd "other C-m C-a C-k C-m")
        (with-current-buffer "server"
          (should (string= "*Messages*" (erc--switch-to-buffer))))))

    (ert-info ("Any ERC-buffer selectable from non-ERC buffer")
      (should-not (eq major-mode 'erc-mode))
      (ert-simulate-keys (list ?o ?t ?h ?e ?r ?\C-m)
        (should (string= "other" (erc--switch-to-buffer)))))

    (dolist (b '("server" "other" "#chan" "#foo" "#fake"))
      (kill-buffer b))))

(ert-deftest erc-lurker-maybe-trim ()
  (let (erc-lurker-trim-nicks
        (erc-lurker-ignore-chars "_`"))

    (should (string= "nick`" (erc-lurker-maybe-trim "nick`")))

    (setq erc-lurker-trim-nicks t)
    (should (string= "nick" (erc-lurker-maybe-trim "nick`")))
    (should (string= "ni`_ck" (erc-lurker-maybe-trim "ni`_ck__``")))

    (setq erc-lurker-ignore-chars "_-`") ; set of chars, not character alts
    (should (string= "nick" (erc-lurker-maybe-trim "nick-_`")))))

(ert-deftest erc-ring-previous-command-base-case ()
  (ert-info ("Create ring when nonexistent and do nothing")
    (let (erc-input-ring
          erc-input-ring-index)
      (erc-previous-command)
      (should (ring-p erc-input-ring))
      (should (zerop (ring-length erc-input-ring)))
      (should-not erc-input-ring-index)))
  (should-not erc-input-ring))

(ert-deftest erc-ring-previous-command ()
  (with-current-buffer (get-buffer-create "*#fake*")
    (erc-mode)
    (erc-tests--send-prep)
    (setq-local erc-last-input-time 0)
    (should-not (local-variable-if-set-p 'erc-send-completed-hook))
    (set (make-local-variable 'erc-send-completed-hook) nil) ; skip t (globals)
    ;; Just in case erc-ring-mode is already on
    (setq-local erc-pre-send-functions nil)
    (add-hook 'erc-pre-send-functions #'erc-add-to-input-ring)
    ;;
    (cl-letf (((symbol-function 'erc-process-input-line)
               (lambda (&rest _)
                 (insert-before-markers
                  (erc-display-message-highlight 'notice "echo: one\n"))))
              ((symbol-function 'erc-command-no-process-p)
               (lambda (&rest _) t)))
      (ert-info ("Create ring, populate, recall")
        (insert "/one")
        (erc-send-current-line)
        (should (ring-p erc-input-ring))
        (should (zerop (ring-member erc-input-ring "/one"))) ; equal
        (should (save-excursion (forward-line -1) (goto-char (point-at-bol))
                                (looking-at-p "[*]+ echo: one")))
        (should-not erc-input-ring-index)
        (erc-bol)
        (should (looking-at "$"))
        (erc-previous-command)
        (erc-bol)
        (should (looking-at "/one"))
        (should (zerop erc-input-ring-index)))
      (ert-info ("Back to one")
        (should (= (ring-length erc-input-ring) (1+ erc-input-ring-index)))
        (erc-previous-command)
        (should-not erc-input-ring-index)
        (erc-bol)
        (should (looking-at "$"))
        (should (equal (ring-ref erc-input-ring 0) "/one")))
      (ert-info ("Swap input after prompt with previous (#bug46339)")
        (insert "abc")
        (erc-previous-command)
        (should (= 1 erc-input-ring-index))
        (erc-bol)
        (should (looking-at "/one"))
        (should (equal (ring-ref erc-input-ring 0) "abc"))
        (should (equal (ring-ref erc-input-ring 1) "/one"))
        (erc-next-command)
        (erc-bol)
        (should (looking-at "abc")))))
  (when noninteractive
    (kill-buffer "*#fake*")))

(ert-deftest erc-log-irc-protocol ()
  (should-not erc-debug-irc-protocol)
  (with-temp-buffer
    (setq erc-server-process (start-process "fake" (current-buffer) "true")
          erc-server-current-nick "tester"
          erc-session-server "myproxy.localhost"
          erc-session-port 6667)
    (let ((inhibit-message noninteractive))
      (erc-toggle-debug-irc-protocol)
      (erc-log-irc-protocol "PASS changeme\r\n" 'outgoing)
      (setq erc-server-announced-name "irc.gnu.org")
      (erc-log-irc-protocol ":irc.gnu.org 001 tester :Welcome")
      (erc-log-irc-protocol ":irc.gnu.org 002 tester :Your host is irc.gnu.org")
      (setq erc-network 'FooNet)
      (erc-log-irc-protocol ":irc.gnu.org 422 tester :MOTD missing")
      (setq erc-network 'BarNet)
      (erc-log-irc-protocol ":irc.gnu.org 221 tester +i")
      (set-process-query-on-exit-flag erc-server-process nil)))
  (with-current-buffer "*erc-protocol*"
    (goto-char (point-min))
    (search-forward "Version")
    (search-forward "\r\n\r\n")
    (search-forward "myproxy.localhost:6667 >> PASS" (line-end-position))
    (forward-line)
    (search-forward "irc.gnu.org << :irc.gnu.org 001" (line-end-position))
    (forward-line)
    (search-forward "irc.gnu.org << :irc.gnu.org 002" (line-end-position))
    (forward-line)
    (search-forward "FooNet << :irc.gnu.org 422" (line-end-position))
    (forward-line)
    (search-forward "BarNet << :irc.gnu.org 221" (line-end-position)))
  (when noninteractive
    (kill-buffer "*erc-protocol*")
    (should-not erc-debug-irc-protocol)))


;; The point of this test is to ensure output is handled identically
;; regardless of whether a command handler is summoned.

(ert-deftest erc-process-input-line ()
  (let (erc-server-last-sent-time
        erc-server-flood-queue
        (orig-erc-cmd-MSG (symbol-function 'erc-cmd-MSG))
        (erc-default-recipients '("#chan"))
        calls)
    (with-temp-buffer
      (cl-letf (((symbol-function 'erc-cmd-MSG)
                 (lambda (line)
                   (push line calls)
                   (funcall orig-erc-cmd-MSG line)))
                ((symbol-function 'erc-server-buffer)
                 (lambda () (current-buffer)))
                ((symbol-function 'erc-server-process-alive)
                 (lambda () t))
                ((symbol-function 'erc-server-send-queue)
                 #'ignore))

        (ert-info ("Dispatch to user command handler")

          (ert-info ("Baseline")
            (erc-process-input-line "/msg #chan hi\n")
            (should (equal (pop calls) " #chan hi"))
            (should (equal (pop erc-server-flood-queue)
                           '("PRIVMSG #chan :hi\r\n" . utf-8))))

          (ert-info ("Quote preserves line intact")
            (erc-process-input-line "/QUOTE FAKE foo bar\n")
            (should (equal (pop erc-server-flood-queue)
                           '("FAKE foo bar\r\n" . utf-8))))

          (ert-info ("Unknown command respected")
            (erc-process-input-line "/FAKE foo bar\n")
            (should (equal (pop erc-server-flood-queue)
                           '("FAKE foo bar\r\n" . utf-8))))

          (ert-info ("Spaces preserved")
            (erc-process-input-line "/msg #chan hi you\n")
            (should (equal (pop calls) " #chan hi you"))
            (should (equal (pop erc-server-flood-queue)
                           '("PRIVMSG #chan :hi you\r\n" . utf-8))))

          (ert-info ("Empty line honored")
            (erc-process-input-line "/msg #chan\n")
            (should (equal (pop calls) " #chan"))
            (should (equal (pop erc-server-flood-queue)
                           '("PRIVMSG #chan :\r\n" . utf-8)))))

        (ert-info ("Implicit cmd via `erc-send-input-line-function'")

          (ert-info ("Baseline")
            (erc-process-input-line "hi")
            (should (equal (pop erc-server-flood-queue)
                           '("PRIVMSG #chan :hi\r\n" . utf-8))))

          (ert-info ("Spaces preserved")
            (erc-process-input-line "hi you")
            (should (equal (pop erc-server-flood-queue)
                           '("PRIVMSG #chan :hi you\r\n" . utf-8))))

          (ert-info ("Empty line transmitted without injected-space kludge")
            (erc-process-input-line "")
            (should (equal (pop erc-server-flood-queue)
                           '("PRIVMSG #chan :\r\n" . utf-8))))

          (should-not calls))))))

;;; erc-tests.el ends here