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use std::borrow::Cow;

use serde_json::Value;

use crate::{
    registry::{MetaSchema, MetaSchemaRef},
    types::{ParseError, ParseFromJSON, ParseFromParameter, ParseResult, ToJSON, Type},
};

impl Type for char {
    const IS_REQUIRED: bool = true;

    type RawValueType = Self;

    type RawElementValueType = Self;

    fn name() -> Cow<'static, str> {
        "char".into()
    }

    fn schema_ref() -> MetaSchemaRef {
        MetaSchemaRef::Inline(Box::new(MetaSchema::new("char")))
    }

    fn as_raw_value(&self) -> Option<&Self::RawValueType> {
        Some(self)
    }

    fn raw_element_iter<'a>(
        &'a self,
    ) -> Box<dyn Iterator<Item = &'a Self::RawElementValueType> + 'a> {
        Box::new(self.as_raw_value().into_iter())
    }
}

impl ParseFromJSON for char {
    fn parse_from_json(value: Option<Value>) -> ParseResult<Self> {
        let value = value.unwrap_or_default();
        if let Value::String(value) = value {
            match value.chars().next() {
                Some(ch) => Ok(ch),
                None => Err(ParseError::expected_input()),
            }
        } else {
            Err(ParseError::expected_type(value))
        }
    }
}

impl ParseFromParameter for char {
    fn parse_from_parameter(value: &str) -> ParseResult<Self> {
        value.parse().map_err(ParseError::custom)
    }
}

impl ToJSON for char {
    fn to_json(&self) -> Option<Value> {
        Some(Value::String(self.to_string()))
    }
}