;; -*- lexical-binding: t; -*-

(use-package eww
  :straight (:type built-in)
  :config
  (defun eww-before-advice (&rest args)
    (interactive
     (let* ((uris (eww-suggested-uris))
            (browser-history (mapcar (lambda (h) (plist-get h :url)) eww-history))
            (suggestions (delete-dups (append uris eww-prompt-history browser-history)))
            (current-uri (plist-get eww-data :url)))
       (list (completing-read "URL or keywords: " suggestions nil nil current-uri 'eww-prompt-history)
             current-prefix-arg))))
  (advice-add 'eww :before #'eww-before-advice)
  (defun eww-rename-buffer-to-title ()
    (rename-buffer (format "*eww: %s*" (plist-get eww-data :title)) t))
  (add-hook 'eww-after-render-hook #'eww-rename-buffer-to-title)
  ;; Copied from https://protesilaos.com/emacs/dotemacs#h:abc20037-7a4f-4555-809a-dc4165c5db6a
  (defun eww-capture-urls-on-page (&optional position)
    "Capture all the links on the current web page.

Return a list of strings.  Strings are in the form LABEL @ URL.
When optional argument POSITION is non-nil, include position info
in the strings too, so strings take the form
LABEL @ URL ~ POSITION."
    (let (links match)
      (save-excursion
        (goto-char (point-max))
        ;; NOTE 2021-07-25: The first clause in the `or' is meant to
        ;; address a bug where if a URL is in `point-min' it does not get
        ;; captured.
        (while (setq match (text-property-search-backward 'shr-url))
          (let* ((raw-url (prop-match-value match))
                 (start-point-prop (prop-match-beginning match))
                 (end-point-prop (prop-match-end match))
                 (url (when (stringp raw-url)
                        (propertize raw-url 'face 'link)))
                 (label (replace-regexp-in-string "\n" " " ; NOTE 2021-07-25: newlines break completion
                                                  (buffer-substring-no-properties
                                                   start-point-prop end-point-prop)))
                 (point start-point-prop)
                 (line (line-number-at-pos point t))
                 (column (save-excursion (goto-char point) (current-column)))
                 (coordinates (propertize
                               (format "%d,%d (%d)" line column point)
                               'face 'shadow)))
            (when url
              (if position
                  (push (format "%-15s ~ %s  @ %s"
                                coordinates label url)
                        links)
                (push (format "%s  @ %s"
                              label url)
                      links))))))
      links))
  (defun eww-visit-url-on-page (&optional arg)
    "Visit URL from list of links on the page using completion.

With optional prefix ARG (\\[universal-argument]) open URL in a
new EWW buffer."
    (interactive "P")
    (when (derived-mode-p 'eww-mode)
      (let* ((links (eww-capture-urls-on-page))
             (selection (completing-read "Browse URL: " links nil t))
             (url (replace-regexp-in-string ".*@ " "" selection)))
        (eww url (when arg 4)))))
  (defun eww-jump-to-url-on-page (&optional arg)
    "Jump to URL position on the page using completion."
    (interactive "P")
    (when (derived-mode-p 'eww-mode)
      (let* ((links (eww-capture-urls-on-page t))
             (prompt (format "Jump to URL: "))
             (selection (completing-read prompt links nil t))
             (position (replace-regexp-in-string "^.*(\\([0-9]+\\))[\s\t]+~" "\\1" selection))
             (point (string-to-number position)))
        (goto-char point))))
  :general
  (leader-map "E" #'eww)
  (normal eww-mode-map
          "go" #'eww
          "gJ"#'eww-jump-to-url-on-page
          "gV" #'eww-visit-url-on-page))

(use-package shr-tag-pre-highlight
  :ensure t
  :after shr
  :config
  (add-to-list 'shr-external-rendering-functions
               '(pre . shr-tag-pre-highlight)))

(provide 'init-eww)