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(in-package #:live-chat-ui)

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(defvar *default-prefix* "/lisp-chat")

(defun set-subpath-prefix (prefix)
  (setf *default-prefix* prefix))

(defun subpath-prefix (path)
  (format nil "~a~a" *default-prefix* path))
  
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;; Render chat messages
(defun render-chat-messages ()
  "Render the list of chat messages as HTML."
  (let ((messages (fetch-messages)))
    (if messages
        (cl-who:with-html-output-to-string (*standard-output* nil :indent t)
          (loop for msg in messages
                do (cl-who:htm
                    (:div :class "box"
                          :style "overflow:auto;"
                          (cl-who:str msg)))))
        "")))

;; Render chat UI
(defun render-chat-ui ()
  "Render the main chat page with HTMX integration."
  (cl-who:with-html-output-to-string (*standard-output* nil :prologue t :indent t)
    (:html :lang "en"
           (:head
            (:meta :charset "utf-8")
            (:meta :name "viewport" :content "width=device-width, initial-scale=1")
            (:title "Live Chat")
            (:link :rel "stylesheet"
                   :href "https://cdnjs.cloudflare.com/ajax/libs/bulma/1.0.2/css/bulma.min.css"
                   :integrity "sha512-RpeJZX3aH5oZN3U3JhE7Sd+HG8XQsqmP3clIbu4G28p668yNsRNj3zMASKe1ATjl/W80wuEtCx2dFA8xaebG5w=="
                   :crossorigin "anonymous"
                   :referrerpolicy "no-referrer")
            (:script :src "https://cdnjs.cloudflare.com/ajax/libs/htmx/2.0.3/htmx.min.js"
                     :integrity "sha512-dQu3OKLMpRu85mW24LA1CUZG67BgLPR8Px3mcxmpdyijgl1UpCM1RtJoQP6h8UkufSnaHVRTUx98EQT9fcKohw=="
                     :crossorigin "anonymous"
                     :referrerpolicy "no-referrer")
            (:script :src "https://cdnjs.cloudflare.com/ajax/libs/htmx/2.0.3/ext/ws.min.js"
                     :integrity "sha512-1OIiXEswZd/etj60BUwFmyoi0OhrWdoYlzayJpSBivoMV0pQPIQr+vtAn3W3htsbWtLRU8DrBl0epdK4DQbj/w=="
                     :crossorigin "anonymous"
                     :referrerpolicy "no-referrer"))
           (:body
            (:section :class "section"
                      (:div :class "container"
                            (:h1 :class "title" "Live Chat")
                            (:div :class "field has-addons"
                                  (:div :class "control is-expanded"
                                        (:input :class "input is-expanded"
                                                :id "chat-input"
                                                :autocomplete "off"
                                                :placeholder "Enter your message..."
                                                :type "text" :name "message"))
                                  (:div :class "control"
                                        (:button :class "button is-link is-light"
                                                 :type "submit" "Send")))))
            (:section :class "section"
                      (:div :class "container"
                            :hx-ext "ws"
                            :ws-connect (subpath-prefix "/ws-chat-messages")
                            (:h3 :class "title is-3" "Chat Messages")
                            (:div :class "container"
                                  :id "chat-messages"
                                  :hx-get "/chat-messages"
                                  (cl-who:str (render-chat-messages)))))
            (:script "
////////////////////////////////////////////////////////////////////////////////

function receivedMessage(msg) {
    document.querySelector('#chat-messages')
        .insertAdjacentHTML('afterbegin', msg.data);
}

// TODO {{ server-name }}:{{ server-port }}
const ws = new WebSocket('ws://' + window.location.host + '/ws-chat-messages');
ws.addEventListener('message', receivedMessage);

////////////////////////////////////////////////////////////////////////////////

const inputField = document.getElementById('chat-input');
inputField.addEventListener('keyup', (evt) => {
    if (evt.key === 'Enter') {
        ws.send(evt.target.value);
        evt.target.value = '';
    }
});")))))