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use std::borrow::Cow;

use poem::{http::HeaderValue, web::Field};
use rust_decimal::Decimal;
use serde_json::Value;

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

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

    type RawValueType = Self;

    type RawElementValueType = Self;

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

    fn schema_ref() -> MetaSchemaRef {
        MetaSchemaRef::Inline(Box::new(MetaSchema::new_with_format("string", "decimal")))
    }

    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 Decimal {
    fn parse_from_json(value: Option<Value>) -> ParseResult<Self> {
        let value = value.unwrap_or_default();
        match value {
            Value::String(value) => Ok(value.parse()?),
            Value::Number(num) if num.is_i64() => Ok(Decimal::from(
                num.as_i64()
                    .ok_or_else(|| ParseError::custom("Expected a number"))?,
            )),
            Value::Number(num) if num.is_u64() => Ok(Decimal::from(
                num.as_u64()
                    .ok_or_else(|| ParseError::custom("Expected a number"))?,
            )),
            Value::Number(num) if num.is_f64() => Ok(Decimal::try_from(
                num.as_f64()
                    .ok_or_else(|| ParseError::custom("Expected a float"))?,
            )
            .map_err(|_| ParseError::custom("Float out of range"))?),
            _ => Err(ParseError::expected_type(value)),
        }
    }
}

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

#[poem::async_trait]
impl ParseFromMultipartField for Decimal {
    async fn parse_from_multipart(field: Option<Field>) -> ParseResult<Self> {
        match field {
            Some(field) => Ok(field.text().await?.parse()?),
            None => Err(ParseError::expected_input()),
        }
    }
}

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

impl ToHeader for Decimal {
    fn to_header(&self) -> Option<HeaderValue> {
        HeaderValue::from_str(&self.normalize().to_string()).ok()
    }
}