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// This example provide a quick overview of the new features in the
// `dispatching` module.

use rand::Rng;

use teloxide::{
    prelude::*,
    types::{Dice, Update, UserId},
    utils::command::BotCommands,
};

#[tokio::main]
async fn main() {
    pretty_env_logger::init();
    log::info!("Starting dispatching features bot...");

    let bot = Bot::from_env();

    let parameters = ConfigParameters {
        bot_maintainer: UserId(0), // Paste your ID to run this bot.
        maintainer_username: None,
    };

    let handler = Update::filter_message()
        // You can use branching to define multiple ways in which an update will be handled. If the
        // first branch fails, an update will be passed to the second branch, and so on.
        .branch(
            dptree::entry()
                // Filter commands: the next handlers will receive a parsed `SimpleCommand`.
                .filter_command::<SimpleCommand>()
                // If a command parsing fails, this handler will not be executed.
                .endpoint(simple_commands_handler),
        )
        .branch(
            // Filter a maintainer by a used ID.
            dptree::filter(|cfg: ConfigParameters, msg: Message| {
                msg.from().map(|user| user.id == cfg.bot_maintainer).unwrap_or_default()
            })
            .filter_command::<MaintainerCommands>()
            .endpoint(|msg: Message, bot: Bot, cmd: MaintainerCommands| async move {
                match cmd {
                    MaintainerCommands::Rand { from, to } => {
                        let mut rng = rand::rngs::OsRng::default();
                        let value: u64 = rng.gen_range(from..=to);

                        bot.send_message(msg.chat.id, value.to_string()).await?;
                        Ok(())
                    }
                }
            }),
        )
        .branch(
            // Filtering allow you to filter updates by some condition.
            dptree::filter(|msg: Message| msg.chat.is_group() || msg.chat.is_supergroup())
                // An endpoint is the last update handler.
                .endpoint(|msg: Message, bot: Bot| async move {
                    log::info!("Received a message from a group chat.");
                    bot.send_message(msg.chat.id, "This is a group chat.").await?;
                    respond(())
                }),
        )
        .branch(
            // There are some extension filtering functions on `Message`. The following filter will
            // filter only messages with dices.
            Message::filter_dice().endpoint(|bot: Bot, msg: Message, dice: Dice| async move {
                bot.send_message(msg.chat.id, format!("Dice value: {}", dice.value))
                    .reply_to_message_id(msg.id)
                    .await?;
                Ok(())
            }),
        );

    Dispatcher::builder(bot, handler)
        // Here you specify initial dependencies that all handlers will receive; they can be
        // database connections, configurations, and other auxiliary arguments. It is similar to
        // `actix_web::Extensions`.
        .dependencies(dptree::deps![parameters])
        // If no handler succeeded to handle an update, this closure will be called.
        .default_handler(|upd| async move {
            log::warn!("Unhandled update: {:?}", upd);
        })
        // If the dispatcher fails for some reason, execute this handler.
        .error_handler(LoggingErrorHandler::with_custom_text(
            "An error has occurred in the dispatcher",
        ))
        .enable_ctrlc_handler()
        .build()
        .dispatch()
        .await;
}

#[derive(Clone)]
struct ConfigParameters {
    bot_maintainer: UserId,
    maintainer_username: Option<String>,
}

#[derive(BotCommands, Clone)]
#[command(rename_rule = "lowercase", description = "Simple commands")]
enum SimpleCommand {
    #[command(description = "shows this message.")]
    Help,
    #[command(description = "shows maintainer info.")]
    Maintainer,
    #[command(description = "shows your ID.")]
    MyId,
}

#[derive(BotCommands, Clone)]
#[command(rename_rule = "lowercase", description = "Maintainer commands")]
enum MaintainerCommands {
    #[command(parse_with = "split", description = "generate a number within range")]
    Rand { from: u64, to: u64 },
}

async fn simple_commands_handler(
    cfg: ConfigParameters,
    bot: Bot,
    me: teloxide::types::Me,
    msg: Message,
    cmd: SimpleCommand,
) -> Result<(), teloxide::RequestError> {
    let text = match cmd {
        SimpleCommand::Help => {
            if msg.from().unwrap().id == cfg.bot_maintainer {
                format!(
                    "{}\n\n{}",
                    SimpleCommand::descriptions(),
                    MaintainerCommands::descriptions()
                )
            } else if msg.chat.is_group() || msg.chat.is_supergroup() {
                SimpleCommand::descriptions().username_from_me(&me).to_string()
            } else {
                SimpleCommand::descriptions().to_string()
            }
        }
        SimpleCommand::Maintainer => {
            if msg.from().unwrap().id == cfg.bot_maintainer {
                "Maintainer is you!".into()
            } else if let Some(username) = cfg.maintainer_username {
                format!("Maintainer is @{username}")
            } else {
                format!("Maintainer ID is {}", cfg.bot_maintainer)
            }
        }
        SimpleCommand::MyId => {
            format!("{}", msg.from().unwrap().id)
        }
    };

    bot.send_message(msg.chat.id, text).await?;

    Ok(())
}