use crate::state::{Channel, Server};

use chrono::NaiveDateTime;
use serde::{Deserialize, Serialize};
use std::fmt;

/// Something that happened in our channel at a point in time.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MumbleEvent {
    pub timestamp: NaiveDateTime,
    pub kind: MumbleEventKind
}

impl fmt::Display for MumbleEvent {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "[{}] {}", self.timestamp.format("%d %b %H:%M"), self.kind)
    }
}

/// The different kinds of events that can happen.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum MumbleEventKind {
    UserConnected(String, String),
    UserDisconnected(String, String),
    UserMuteStateChanged(String),  // This logic is kinda weird so we only store the rendered message.
    TextMessageReceived(String),
    UserJoinedChannel(String, String),
    UserLeftChannel(String, String),
}

//TODO These strings are (mostly) duplicated with their respective notifications.
//     The only difference is that the text message event doesn't contain the text message.
impl fmt::Display for MumbleEventKind {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            MumbleEventKind::UserConnected(user, channel) => {
                write!(f, "{} connected to {}", user, channel)
            }
            MumbleEventKind::UserDisconnected(user, channel) => {
                write!(f, "{} disconnected from {}", user, channel)
            }
            MumbleEventKind::UserMuteStateChanged(message) => {
                write!(f, "{}", message)
            }
            MumbleEventKind::TextMessageReceived(user) => {
                write!(f, "{} sent a text message", user)
            }
            MumbleEventKind::UserJoinedChannel(name, from) => {
                write!(f, "{} moved to your channel from {}", name, from)
            }
            MumbleEventKind::UserLeftChannel(name, to) => {
                write!(f, "{} moved to {}", name, to)
            }

        }
    }
}

#[derive(Clone, Debug, Deserialize, Serialize)]
pub enum Command {
    ChannelJoin {
        channel_identifier: String,
    },
    ChannelList,
    ConfigReload,
    DeafenSelf(Option<bool>),
    Events {
        block: bool
    },
    InputVolumeSet(f32),
    MuteOther(String, Option<bool>),
    MuteSelf(Option<bool>),
    OutputVolumeSet(f32),
    PastMessages {
        block: bool,
    },
    Ping,
    SendMessage {
        message: String,
        targets: MessageTarget,
    },
    ServerConnect {
        host: String,
        port: u16,
        username: String,
        password: Option<String>,
        accept_invalid_cert: bool,
    },
    ServerDisconnect,
    ServerStatus {
        host: String,
        port: u16,
    },
    Status,
    UserVolumeSet(String, f32),
}

#[derive(Debug, Deserialize, Serialize)]
pub enum CommandResponse {
    ChannelList {
        channels: Channel,
    },
    DeafenStatus {
        is_deafened: bool,
    },
    Event {
        event: MumbleEvent,
    },
    MuteStatus {
        is_muted: bool,
    },
    PastMessage {
        message: (NaiveDateTime, String, String),
    },
    Pong,
    ServerConnect {
        welcome_message: Option<String>,
        server_state: Server,
    },
    ServerStatus {
        version: u32,
        users: u32,
        max_users: u32,
        bandwidth: u32,
    },
    Status {
        server_state: Server,
    },
}

/// Messages sent to channels can be sent either to a named channel or the
/// currently connected channel.
#[derive(Clone, Debug, Deserialize, Serialize)]
pub enum ChannelTarget {
    Current,
    Named(String)
}

/// Messages can be sent to either channels or specific users.
#[derive(Clone, Debug, Deserialize, Serialize)]
pub enum MessageTarget {
    Channel(Vec<(ChannelTarget, bool)>),  // (target, recursive)
    User(Vec<String>),
}