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use crate::frame::Frame;
use std::io;
use std::string::FromUtf8Error;
use thiserror::Error;
use tokio::sync::mpsc::error::SendError;
use tokio::time::error::Elapsed;
use url::ParseError;

#[derive(Error, Debug)]
pub enum Error {
    // Sender / Receiver Errors
    #[error("{source}")]
    SendError {
        #[from]
        source: SendError<Frame>,
    },

    #[error("channel communication error")]
    CommunicationError,

    // General Errors
    #[error("{source}")]
    Timeout {
        #[from]
        source: Elapsed,
    },

    #[error("IO Error happened: {source}")]
    IOError {
        #[from]
        source: io::Error,
    },

    #[error("{source}")]
    FromUtf8Error {
        #[from]
        source: FromUtf8Error,
    },

    // Handshake Errors
    #[error("Couldn't find Sec-WebSocket-Key header in the request")]
    NoSecWebsocketKey,

    #[error("Server didn't upgrade the connection")]
    NoUpgrade,

    #[error("Sever didn't send a valid Sec-WebSocket-Accept key")]
    InvalidAcceptKey,

    // Framing Errors
    #[error("RSV not zero")]
    RSVNotZero,

    #[error("Control frames must not be fragmented")]
    ControlFramesFragmented,

    #[error("Control frame with invalid payload size, can be greater than 125")]
    ControlFramePayloadSize,

    #[error("Payload too large")]
    PayloadSize,

    // Fragmentation Errors
    #[error("Invalid frame while there is a fragmented message in progress")]
    InvalidFrameFragmentation,

    #[error("Incoming fragmented message but there is one already in progress")]
    FragmentedInProgress,

    #[error("Invalid continuation frame: no fragmented message to continue")]
    InvalidContinuationFrame,

    #[error("Invalid Opcode")]
    InvalidOpcode,

    // HTTP Errors
    #[error("{source}")]
    URLParseError {
        #[from]
        source: ParseError,
    },

    #[error("Invalid scheme in WebSocket URL")]
    InvalidSchemeURL,

    #[error("URL has no host")]
    URLNoHost,

    #[error("URL has no port")]
    URLNoPort,
}