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;; SPDX-License-Identifier: EUPL-1.2
;; SPDX-FileCopyrightText: 2025 Uko Kokņevičs <perkontevs@gmail.com>
(defpackage :ukkoclot/src/tg/message-entity
(:documentation "MessageEntity Telegram type")
(:use :c2cl :iterate :ukkoclot/src/enum :ukkoclot/src/tg/type-macros :ukkoclot/src/tg/user)
(:export
#:message-entity-type
#:mention
#:hashtag
#:cashtag
#:bot-command
#:url-entity
#:email
#:phone-number
#:bold
#:italic
#:underline
#:strikethrough
#:spoiler
#:blockquote
#:expandable-blockquote
#:code
#:pre
#:text-link
#:text-mention
#:custom-emoji
#:message-entity
#:make-message-entity
#:message-entity-p
#:copy-message-entity
#:message-entity-offset
#:message-entity-length
#:message-entity-url
#:message-entity-user
#:message-entity-language
#:message-entity-custom-emoji-id
#:message-entity-extract))
(in-package :ukkoclot/src/tg/message-entity)
(define-enum message-entity-type
(mention "mention")
(hashtag "hashtag")
(cashtag "cashtag")
(bot-command "bot_command")
(url-entity "url")
(email "email")
(phone-number "phone_number")
(bold "bold")
(italic "italic")
(underline "underline")
(strikethrough "strikethrough")
(spoiler "spoiler")
(blockquote "blockquote")
(expandable-blockquote "expandable_blockquote")
(code "code")
(pre "pre")
(text-link "text_link")
(text-mention "text_mention")
(custom-emoji "custom_emoji"))
(define-tg-type message-entity
(type message-entity-type)
(offset integer)
(length integer)
(url (or string null) nil)
(user (or user null) nil)
(language (or string null) nil)
(custom-emoji-id (or string null) nil))
(unless (= char-code-limit #x110000)
(error "Some UTF-16 fuckery assumes that system chars are UTF-32"))
(defun utf16-width (ch)
"Calculate the size of char in UTF-16 units."
(declare (type character ch))
(if (< (char-code ch) #x10000)
1
2))
(defun message-entity-extract (entity text)
"Extract the text corresponding to the ENTITY from the message text (in TEXT)."
(check-type entity message-entity)
(check-type text string)
(with-slots (length offset) entity
(if (zerop length)
""
(let* ((start (iterate
(with curr-idx16 = 0)
(for ch in-string text with-index curr-idx32)
(for curr-width = (utf16-width ch))
(when (or (= curr-idx16 offset)
(> (+ curr-idx16 curr-width) offset))
(return curr-idx32))
(incf curr-idx16 curr-width)
(finally (return (length text)))))
(end (iterate
(with curr-len16 = 0)
(for ch in-string text from start with-index curr-idx32)
(for curr-width = (utf16-width ch))
(when (>= curr-len16 length)
(return curr-idx32))
(incf curr-len16 curr-width)
(finally (return (length text))))))
(subseq text start end)))))
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