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

;; Copyright (C) 2020-2021 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)
(require 'erc)
(require 'erc-ring)

(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-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)
    (insert "\n\n")
    (setq erc-input-marker (make-marker) ; these are all local
          erc-insert-marker (make-marker)
          erc-send-completed-hook nil)
    (set-marker erc-insert-marker (point-max))
    (erc-display-prompt)
    (should (= (point) erc-input-marker))
    (add-hook 'erc-pre-send-functions #'erc-add-to-input-ring nil t)
    ;;
    (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*")))