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use core::fmt;
use std::time::Duration;

use serde::{Deserialize, Deserializer, Serialize, Serializer};

use crate::Timestamp;

#[cfg(not(feature = "as-float-secs"))]
impl Serialize for Timestamp {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        serializer.serialize_u128(self.as_nanos())
    }
}

#[cfg(feature = "as-float-secs")]
impl Serialize for Timestamp {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        serializer.serialize_f64(self.as_secs_f64())
    }
}

struct TimeVisitor;

impl<'de> serde::de::Visitor<'de> for TimeVisitor {
    type Value = Timestamp;

    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        formatter.write_str("a string, float, an unsigned integer, or a 2-element array")
    }

    #[cfg(not(feature = "as-float-secs"))]
    fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E>
    where
        E: serde::de::Error,
    {
        Ok(value.into())
    }

    #[cfg(feature = "as-float-secs")]
    fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E>
    where
        E: serde::de::Error,
    {
        Ok(Timestamp::from_secs(value))
    }

    fn visit_f32<E>(self, value: f32) -> Result<Self::Value, E>
    where
        E: serde::de::Error,
    {
        Ok(value.into())
    }

    fn visit_f64<E>(self, value: f64) -> Result<Self::Value, E>
    where
        E: serde::de::Error,
    {
        Ok(value.into())
    }

    fn visit_seq<V>(self, mut seq: V) -> Result<Self::Value, V::Error>
    where
        V: serde::de::SeqAccess<'de>,
    {
        let s: u64 = seq
            .next_element()?
            .ok_or_else(|| serde::de::Error::invalid_length(0, &self))?;
        let ns: u32 = seq
            .next_element()?
            .ok_or_else(|| serde::de::Error::invalid_length(1, &self))?;
        Ok(Duration::new(s, ns).into())
    }

    #[cfg(feature = "chrono")]
    fn visit_string<E>(self, value: String) -> Result<Self::Value, E>
    where
        E: serde::de::Error,
    {
        value
            .parse()
            .map_err(|_| serde::de::Error::custom("invalid time string"))
    }
    #[cfg(feature = "chrono")]
    fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
    where
        E: serde::de::Error,
    {
        value
            .parse()
            .map_err(|_| serde::de::Error::custom("invalid time string"))
    }
}

impl<'de> Deserialize<'de> for Timestamp {
    fn deserialize<D>(deserializer: D) -> Result<Timestamp, D::Error>
    where
        D: Deserializer<'de>,
    {
        deserializer.deserialize_any(TimeVisitor)
    }
}