//! Twitch-specifica that only appear on Twitch-specific messages/tags.

use std::fmt::{Display, Formatter};
use std::ops::Range;

#[cfg(feature = "with-serde")]
use {serde::Deserialize, serde::Serialize};

/// Set of information describing the basic details of a Twitch user.
#[derive(Debug, Clone, PartialEq, Eq)]
#[cfg_attr(feature = "with-serde", derive(Serialize, Deserialize))]
pub struct TwitchUserBasics {
    /// The user's unique ID, e.g. `103973901`
    pub id: String,
    /// The user's login name. For many users, this is simply the lowercased version of their
    /// (display) name, but there are also many users where there is no direct relation between
    /// `login` and `name`.
    ///
    /// A Twitch user can change their `login` and `name` while still keeping their `id` constant.
    /// For this reason, you should always prefer to use the `id` to uniquely identify a user, while
    /// `login` and `name` are variable properties for them.
    ///
    /// The `login` name is used in many places to refer to users, e.g. in the URL for their channel page,
    /// or also in almost all places on the Twitch IRC interface (e.g. when sending a message to a
    /// channel, you specify the channel by its login name instead of ID).
    pub login: String,
    /// Display name of the user. When possible a user should be referred to using this name
    /// in user-facing contexts.
    ///
    /// This value is never used to uniquely identify a user, and you
    /// should avoid making assumptions about the format of this value.
    /// For example, the `name` can contain non-ascii characters, it can contain spaces and
    /// it can have spaces at the start and end (albeit rare).
    pub name: String,
}

/// An RGB color, used to color chat user's names.
///
/// This struct's `Display` implementation formats the color in the way Twitch expects it for
/// the "Update User Chat Color" API method, i.e. uppercase hex RGB with a `#`, e.g.:
///
/// ```rust
/// use twitch_irc::message::RGBColor;
/// let color = RGBColor {
///     r: 0x12,
///     g: 0x00,
///     b: 0x0F
/// };
/// assert_eq!(color.to_string(), "#12000F");
/// ```
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[cfg_attr(feature = "with-serde", derive(Serialize, Deserialize))]
pub struct RGBColor {
    /// Red component
    pub r: u8,
    /// Green component
    pub g: u8,
    /// Blue component
    pub b: u8,
}

impl Display for RGBColor {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "#{:0>2X}{:0>2X}{:0>2X}", self.r, self.g, self.b)
    }
}

/// A single emote, appearing as part of a message.
#[derive(Debug, Clone, PartialEq, Eq)]
#[cfg_attr(feature = "with-serde", derive(Serialize, Deserialize))]
pub struct Emote {
    /// An ID identifying this emote. For example `25` for the "Kappa" emote, but can also be non-numeric,
    /// for example on emotes modified using Twitch channel points, e.g.
    /// `301512758_TK` for `pajaDent_TK` where `301512758` is the ID of the original `pajaDent` emote.
    pub id: String,
    /// A range of characters in the original message where the emote is placed.
    ///
    /// As is documented on `Range`, the `start` index of this range is inclusive, while the
    /// `end` index is exclusive.
    ///
    /// This is always the exact range of characters that Twitch originally sent.
    /// Note that due to [a Twitch bug](https://github.com/twitchdev/issues/issues/104)
    /// (that this library intentionally works around), the character range specified here
    /// might be out-of-bounds for the original message text string.
    pub char_range: Range<usize>,
    /// This is the text that this emote replaces, e.g. `Kappa` or `:)`.
    pub code: String,
}

/// A single Twitch "badge" to be shown next to the user's name in chat.
///
/// The combination of `name` and `version` fully describes the exact badge to display.
#[derive(Debug, Clone, PartialEq, Eq)]
#[cfg_attr(feature = "with-serde", derive(Serialize, Deserialize))]
pub struct Badge {
    /// A string identifying the type of badge. For example, `admin`, `moderator` or `subscriber`.
    pub name: String,
    /// A (usually) numeric version of this badge. Most badges only have one version (then usually
    /// version will be `0` or `1`), but other types of badges have different versions (e.g. `subscriber`)
    /// to differentiate between levels, or lengths, or similar, depending on the badge.
    pub version: String,
}

/// Extract the `message_id` from a [`PrivmsgMessage`](crate::message::PrivmsgMessage) or directly
/// use an arbitrary [`String`] or [`&str`] as a message ID. This trait allows you to plug both
/// of these types directly into [`say_in_reply_to()`](crate::TwitchIRCClient::say_in_reply_to)
/// for your convenience.
///
/// For tuples `(&str, &str)` or `(String, String)`, the first member is the login name
/// of the channel the message was sent to, and the second member is the ID of the message
/// to be deleted.
///
/// Note that even though [`UserNoticeMessage`](crate::message::UserNoticeMessage) has a
/// `message_id`, you can NOT reply to these messages or delete them. For this reason,
/// `ReplyToMessage` is not implemented for
/// [`UserNoticeMessage`](crate::message::UserNoticeMessage).
pub trait ReplyToMessage {
    /// Login name of the channel that the message was sent to.
    fn channel_login(&self) -> &str;
    /// The unique string identifying the message, specified on the message via the `id` tag.
    fn message_id(&self) -> &str;
}

impl<C, M> ReplyToMessage for (C, M)
where
    C: AsRef<str>,
    M: AsRef<str>,
{
    fn channel_login(&self) -> &str {
        self.0.as_ref()
    }

    fn message_id(&self) -> &str {
        self.1.as_ref()
    }
}

#[cfg(test)]
mod tests {
    use crate::message::{IRCMessage, PrivmsgMessage, ReplyToMessage};
    use std::convert::TryFrom;

    #[test]
    pub fn test_reply_to_message_trait_impl() {
        // just making sure that DeleteMessage is implemented for all of these variants
        let _a: Box<dyn ReplyToMessage> = Box::new(("asd", "def"));
        let _b: Box<dyn ReplyToMessage> = Box::new(("asd".to_owned(), "def"));
        let _c: Box<dyn ReplyToMessage> = Box::new(("asd", "def".to_owned()));
        let d: Box<dyn ReplyToMessage> = Box::new(("asd".to_owned(), "def".to_owned()));

        assert_eq!(d.channel_login(), "asd");
        assert_eq!(d.message_id(), "def");
    }

    fn function_with_impl_arg(a: &impl ReplyToMessage) -> String {
        a.message_id().to_owned()
    }

    #[test]
    pub fn test_reply_to_message_trait_for_privmsg() {
        let src = "@badge-info=;badges=;color=#0000FF;display-name=JuN1oRRRR;emotes=;flags=;id=e9d998c3-36f1-430f-89ec-6b887c28af36;mod=0;room-id=11148817;subscriber=0;tmi-sent-ts=1594545155039;turbo=0;user-id=29803735;user-type= :jun1orrrr!jun1orrrr@jun1orrrr.tmi.twitch.tv PRIVMSG #pajlada :dank cam";
        let irc_message = IRCMessage::parse(src).unwrap();
        let msg = PrivmsgMessage::try_from(irc_message).unwrap();

        let msg_ref: &PrivmsgMessage = &msg; // making sure the trait is implemented for the ref as well
        assert_eq!(msg_ref.channel_login(), "pajlada");
        assert_eq!(msg_ref.message_id(), "e9d998c3-36f1-430f-89ec-6b887c28af36");
        // testing references work as arguments, as intended
        assert_eq!(
            function_with_impl_arg(msg_ref),
            "e9d998c3-36f1-430f-89ec-6b887c28af36"
        );
    }
}