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use serde_json::Value;

use crate::types::{DataType, ParseError, ParseResult, Type};

impl<T: Type> Type for Option<T> {
    const DATA_TYPE: DataType = T::DATA_TYPE;
    const IS_REQUIRED: bool = false;

    fn parse(value: Option<Value>) -> ParseResult<Self> {
        match value.unwrap_or_default() {
            Value::Null => Ok(None),
            value => Ok(Some(T::parse(Some(value)).map_err(ParseError::propagate)?)),
        }
    }

    fn parse_from_str(value: Option<&str>) -> ParseResult<Self> {
        match value {
            Some(value) => T::parse_from_str(Some(value))
                .map_err(ParseError::propagate)
                .map(Some),
            None => Ok(None),
        }
    }

    fn to_value(&self) -> Value {
        match self {
            Some(value) => value.to_value(),
            None => Value::Null,
        }
    }
}