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use std::{
    convert::{TryFrom, TryInto},
    fmt::{Display, Formatter},
    io::Write,
};

#[cfg(feature = "arbitrary")]
use arbitrary::Arbitrary;
#[cfg(feature = "serdex")]
use serde::{Deserialize, Serialize};

use crate::{codec::Encode, types::core::Atom};

pub mod address;
pub mod body;
pub mod command;
pub mod core;
pub mod datetime;
pub mod envelope;
pub mod fetch_attributes;
pub mod flag;
pub mod mailbox;
pub mod response;
pub mod sequence;

/// Note: Defined by [SASL]
#[cfg_attr(feature = "arbitrary", derive(Arbitrary))]
#[cfg_attr(feature = "serdex", derive(Serialize, Deserialize))]
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum AuthMechanism {
    // RFC4616: The PLAIN Simple Authentication and Security Layer (SASL) Mechanism
    // AUTH=PLAIN
    Plain,
    // TODO: where does it come from?
    // * draft-murchison-sasl-login-00: The LOGIN SASL Mechanism (?)
    // AUTH=LOGIN
    Login,
    Other(AuthMechanismOther),
}

impl<'a> From<Atom> for AuthMechanism {
    fn from(value: Atom) -> Self {
        match value.to_lowercase().as_str() {
            "plain" => AuthMechanism::Plain,
            "login" => AuthMechanism::Login,
            _ => AuthMechanism::Other(AuthMechanismOther(value)),
        }
    }
}

impl Encode for AuthMechanism {
    fn encode(&self, writer: &mut impl Write) -> std::io::Result<()> {
        match &self {
            AuthMechanism::Plain => writer.write_all(b"PLAIN"),
            AuthMechanism::Login => writer.write_all(b"LOGIN"),
            AuthMechanism::Other(AuthMechanismOther(atom)) => atom.encode(writer),
        }
    }
}

#[cfg_attr(feature = "serdex", derive(Serialize, Deserialize))]
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct AuthMechanismOther(Atom);

impl<'a> TryFrom<&'a str> for AuthMechanismOther {
    type Error = ();

    fn try_from(value: &'a str) -> Result<Self, Self::Error> {
        value.to_string().try_into()
    }
}

impl TryFrom<String> for AuthMechanismOther {
    type Error = ();

    fn try_from(value: String) -> Result<Self, Self::Error> {
        Atom::try_from(value)?.try_into()
    }
}

impl<'a> TryFrom<Atom> for AuthMechanismOther {
    type Error = ();

    fn try_from(value: Atom) -> Result<Self, ()> {
        match value.to_lowercase().as_str() {
            "plain" | "login" => Err(()),
            _ => Ok(AuthMechanismOther(value)),
        }
    }
}

impl Encode for AuthMechanismOther {
    fn encode(&self, writer: &mut impl Write) -> std::io::Result<()> {
        self.0.encode(writer)
    }
}

impl Display for AuthMechanismOther {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        self.0.fmt(f)
    }
}

#[cfg_attr(feature = "arbitrary", derive(Arbitrary))]
#[cfg_attr(feature = "serdex", derive(Serialize, Deserialize))]
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum CompressionAlgorithm {
    Deflate,
}

impl Encode for CompressionAlgorithm {
    fn encode(&self, writer: &mut impl Write) -> std::io::Result<()> {
        match self {
            CompressionAlgorithm::Deflate => writer.write_all(b"DEFLATE"),
        }
    }
}