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use chrono_tz::Tz;

use crate::{InputValueError, InputValueResult, Scalar, ScalarType, Value};

#[Scalar(
    internal,
    name = "TimeZone",
    specified_by_url = "http://www.iana.org/time-zones"
)]
impl ScalarType for Tz {
    fn parse(value: Value) -> InputValueResult<Self> {
        match value {
            Value::String(s) => Ok(s.parse()?),
            _ => Err(InputValueError::expected_type(value)),
        }
    }

    fn to_value(&self) -> Value {
        Value::String(self.name().to_owned())
    }
}