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

(defvar servall-results-mode-map special-mode-map)
(defvar servall-results-buffer "*servall-results*")

(define-derived-mode servall-results-mode org-mode "servall-results"
  "Mode for showing and selecting results"
  (setq-local buffer-read-only t
              servall-results-update-function nil
              servall-results-re-search-function nil
              servall-results-open-function nil))

(defun servall-results-update ()
  (interactive)
  (funcall servall-results-update-function))

(defun servall-results-re-search ()
  (interactive)
  (call-interactively servall-results-re-search-function))

(defun servall-results-open ()
  (interactive)
  (funcall servall-results-open-function))

(define-key servall-results-mode-map "n" 'org-next-visible-heading)
(define-key servall-results-mode-map "g" 'servall-results-update)
(define-key servall-results-mode-map "\r" 'servall-results-open)
(define-key servall-results-mode-map "p" 'org-previous-visible-heading)
(define-key servall-results-mode-map "s" 'servall-results-re-search)

(define-derived-mode servall-wikipedia-results-mode servall-results-mode
  "servall-wikipedia-results"
  "Mode for showing and selecting wikipedia results"
  (setq-local servall-wikipedia-results-query nil))

(defun servall-wikipedia-results-highlight ()
  (save-excursion
    (goto-char (point-min))
    (while (re-search-forward "<span class=\"searchmatch\">\\(.*?\\)</span>" nil t)
      (replace-match
       (propertize (match-string 1) 'font-lock-face 'match)))))

(defun servall-wikipedia-results-update ()
  (let* ((resp (servall-api-wikipedia-search servall-wikipedia-results-query))
         (results (alist-get 'search
                             (alist-get 'query resp)))
         (inhibit-read-only t))
    (erase-buffer)
    (mapc
     (lambda (result)
       (let ((title (alist-get 'title result)))
         (insert
          (propertize
           (concat "* " title "\n")
           'title title))
         (insert (alist-get 'snippet result) "\n\n")))
     results)
    (servall-wikipedia-results-highlight)
    (goto-char (point-min))))

(defun servall-wikipedia-search (query)
  (interactive "sWikipedia Query: ")
  (with-current-buffer (get-buffer-create servall-results-buffer)
    (servall-wikipedia-results-mode)
    (setq servall-wikipedia-results-query query
          servall-results-update-function 'servall-wikipedia-results-update
          servall-results-re-search-function 'servall-wikipedia-search
          servall-results-open-function 'servall-wikipedia-results-open)
    (servall-results-update))
  (switch-to-buffer servall-results-buffer))

(defun servall-wikipedia-results-open ()
  (when-let ((title (get-text-property (point) 'title)))
    (switch-to-buffer-other-window (servall-wikipedia-load title))))

(defun servall-wikipedia-to-name (title)
  (replace-regexp-in-string " " "_" title))

(defvar servall-wikipedia-view-mode-map special-mode-map)
(defun servall-wikipedia-view-buffer (title)
  (format "*wikipedia %s*" title))

(defvar servall-wikipedia-view-mode-map special-mode-map)

;; TOOD: fix view mode inheriting key bindings from results mode
(define-derived-mode servall-wikipedia-view-mode org-mode
  "servall-wikipedia-view"
  "Mode for viewing wikipedia entries."
  (setq-local buffer-read-only t
              servall-wikipedia-title nil))

(defun servall-wikipedia-load (title)
  (let ((buffer (get-buffer-create (servall-wikipedia-view-buffer title))))
    (with-current-buffer buffer
      (servall-wikipedia-view-mode)
      (setq servall-wikipedia-title title)
      (let ((inhibit-read-only t))
        (erase-buffer)
        (insert (servall-api-wikipedia-org title)))
      (goto-char (point-min)))
    buffer))

(provide 'servall-wikipedia)