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use crate::error::Error;
use serde::{de::Error as _, Deserialize, Deserializer, Serialize, Serializer};
use std::{
    convert::TryFrom,
    fmt::{self, Display, Formatter},
    str::FromStr,
};

pub const TOKEN_LENGTH: usize = 16;

#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct Token(pub [u8; TOKEN_LENGTH]);

impl Display for Token {
    fn fmt(&self, formatter: &mut Formatter<'_>) -> fmt::Result {
        let Token(bytes) = self;
        let text = hex::encode(bytes);
        write!(formatter, "{}", text)
    }
}

impl FromStr for Token {
    type Err = Error;

    fn from_str(text: &str) -> Result<Self, Self::Err> {
        let bytes = hex::decode(text)
            .map_err(|err| Error::ParseError(format!("cannot decode token: {:?}", err)))?;
        if bytes.len() != TOKEN_LENGTH {
            let msg = format!(
                "invalid length: expected length {}, but found {}",
                TOKEN_LENGTH * 2,
                text.len()
            );
            return Err(Error::ParseError(msg));
        }
        let array = <[u8; TOKEN_LENGTH]>::try_from(bytes.as_slice()).unwrap();
        Ok(Token(array))
    }
}

impl Serialize for Token {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        self.to_string().serialize(serializer)
    }
}

impl<'de> Deserialize<'de> for Token {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        let text = String::deserialize(deserializer)?;
        let token: Self = text
            .parse()
            .map_err(|err| D::Error::custom(format!("{err}")))?;
        Ok(token)
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct VisibilityToken(pub u32);

impl Display for VisibilityToken {
    fn fmt(&self, formatter: &mut Formatter<'_>) -> fmt::Result {
        write!(formatter, "{}", self.0)
    }
}

impl Serialize for VisibilityToken {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        self.0.to_string().serialize(serializer)
    }
}

impl<'de> Deserialize<'de> for VisibilityToken {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        let token = String::deserialize(deserializer)?;
        let token: u32 = token.parse().map_err(|err| {
            D::Error::custom(format!("invalid visibility token \"{token}\": {err}"))
        })?;
        Ok(Self(token))
    }
}