//! TDLib message conversion: JSON → MessageInfo, reply info fetching.

use crate::types::{ChatId, MessageId};
use tdlib_rs::functions;
use tdlib_rs::types::Message as TdMessage;

use crate::tdlib::types::{MessageBuilder, MessageInfo};

use super::MessageManager;

impl MessageManager {
    /// Конвертировать TdMessage в MessageInfo
    pub(crate) async fn convert_message(&self, msg: &TdMessage) -> Option<MessageInfo> {
        use crate::tdlib::message_conversion::{
            extract_content_text, extract_entities, extract_forward_info,
            extract_media_info, extract_reactions, extract_reply_info, extract_sender_name,
        };

        // Извлекаем все части сообщения используя вспомогательные функции
        let content_text = extract_content_text(msg);
        let entities = extract_entities(msg);
        let sender_name = extract_sender_name(msg, self.client_id).await;
        let forward_from = extract_forward_info(msg);
        let reply_to = extract_reply_info(msg);
        let reactions = extract_reactions(msg);
        let media = extract_media_info(msg);

        let mut builder = MessageBuilder::new(MessageId::new(msg.id))
            .sender_name(sender_name)
            .text(content_text)
            .entities(entities)
            .date(msg.date)
            .edit_date(msg.edit_date)
            .media_album_id(msg.media_album_id);

        if msg.is_outgoing {
            builder = builder.outgoing();
        } else {
            builder = builder.incoming();
        }

        if !msg.contains_unread_mention {
            builder = builder.read();
        } else {
            builder = builder.unread();
        }

        if msg.can_be_edited {
            builder = builder.editable();
        }

        if msg.can_be_deleted_only_for_self {
            builder = builder.deletable_for_self();
        }

        if msg.can_be_deleted_for_all_users {
            builder = builder.deletable_for_all();
        }

        if let Some(reply) = reply_to {
            builder = builder.reply_to(reply);
        }

        if let Some(forward) = forward_from {
            builder = builder.forward_from(forward);
        }

        builder = builder.reactions(reactions);

        if let Some(media) = media {
            builder = builder.media(media);
        }

        Some(builder.build())
    }

    /// Загружает недостающую информацию об исходных сообщениях для ответов.
    ///
    /// Ищет все reply-сообщения с `sender_name == "Unknown"` и загружает
    /// полную информацию (имя отправителя, текст) из TDLib.
    ///
    /// # Note
    ///
    /// Вызывайте после загрузки истории чата для заполнения информации о цитируемых сообщениях.
    pub async fn fetch_missing_reply_info(&mut self) {
        // Early return if no chat selected
        let Some(chat_id) = self.current_chat_id else {
            return;
        };

        // Collect message IDs with missing reply info using filter_map
        let to_fetch: Vec<MessageId> = self
            .current_chat_messages
            .iter()
            .filter_map(|msg| {
                msg.interactions
                    .reply_to
                    .as_ref()
                    .filter(|reply| reply.sender_name == "Unknown")
                    .map(|reply| reply.message_id)
            })
            .collect();

        // Fetch and update each missing message
        for message_id in to_fetch {
            self.fetch_and_update_reply(chat_id, message_id).await;
        }
    }

    /// Загружает одно сообщение и обновляет reply информацию.
    async fn fetch_and_update_reply(&mut self, chat_id: ChatId, message_id: MessageId) {
        // Try to fetch the original message
        let Ok(original_msg_enum) =
            functions::get_message(chat_id.as_i64(), message_id.as_i64(), self.client_id).await
        else {
            return;
        };

        let tdlib_rs::enums::Message::Message(original_msg) = original_msg_enum;
        let Some(orig_info) = self.convert_message(&original_msg).await else {
            return;
        };

        // Extract text preview (first 50 chars)
        let text_preview: String = orig_info
            .content
            .text
            .chars()
            .take(50)
            .collect();

        // Update reply info in all messages that reference this message
        self.current_chat_messages
            .iter_mut()
            .filter_map(|msg| msg.interactions.reply_to.as_mut())
            .filter(|reply| reply.message_id == message_id)
            .for_each(|reply| {
                reply.sender_name = orig_info.metadata.sender_name.clone();
                reply.text = text_preview.clone();
            });
    }
}