use std::borrow::Cow;

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

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

macro_rules! impl_type_for_integers {
    ($(($ty:ty, $format:literal)),*) => {
        $(
        impl Type for $ty {
            const IS_REQUIRED: bool = true;

            type RawValueType = Self;

            type RawElementValueType = Self;

            fn name() -> Cow<'static, str> {
                format!("integer({})", $format).into()
            }

            fn schema_ref() -> MetaSchemaRef {
                MetaSchemaRef::Inline(Box::new(MetaSchema::new_with_format("integer", $format)))
            }

            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 $ty {
             fn parse_from_json(value: Option<Value>) -> ParseResult<Self> {
                 let value = value.unwrap_or_default();
                 if let Value::Number(n) = value {
                     let n = n
                         .as_i64()
                         .ok_or_else(|| ParseError::from("invalid integer"))?;

                     if n < Self::MIN as i64 || n > Self::MAX as i64 {
                         return Err(ParseError::from(format!(
                             "Only integers from {} to {} are accepted.",
                             Self::MIN,
                             Self::MAX
                         )));
                     }

                     Ok(n as Self)
                 } else {
                     Err(ParseError::expected_type(value))
                 }
            }
        }

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

        #[poem::async_trait]
        impl ParseFromMultipartField for $ty {
            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 $ty {
            fn to_json(&self) -> Option<Value> {
                Some(Value::Number((*self).into()))
            }
        }

        impl ToHeader for $ty {
            fn to_header(&self) -> Option<HeaderValue> {
                match HeaderValue::from_str(&format!("{}", self)) {
                    Ok(value) => Some(value),
                    Err(_) => None,
                }
            }
        }

        )*
    };
}

macro_rules! impl_type_for_unsigneds {
    ($(($ty:ty, $format:literal)),*) => {
        $(
        impl Type for $ty {
            const IS_REQUIRED: bool = true;

            type RawValueType = Self;

            type RawElementValueType = Self;

            fn name() -> Cow<'static, str> {
                format!("integer({})", $format).into()
            }

            fn schema_ref() -> MetaSchemaRef {
                MetaSchemaRef::Inline(Box::new(MetaSchema::new_with_format("integer", $format)))
            }

            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 $ty {
             fn parse_from_json(value: Option<Value>) -> ParseResult<Self> {
                 let value = value.unwrap_or_default();
                 if let Value::Number(n) = value {
                     let n = n
                         .as_u64()
                         .ok_or_else(|| ParseError::from("invalid integer"))?;

                     if n < Self::MIN as u64 || n > Self::MAX as u64 {
                         return Err(ParseError::from(format!(
                             "Only integers from {} to {} are accepted.",
                             Self::MIN,
                             Self::MAX
                         )));
                     }

                     Ok(n as Self)
                 } else {
                     Err(ParseError::expected_type(value))
                 }
            }
        }

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

        #[poem::async_trait]
        impl ParseFromMultipartField for $ty {
            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 $ty {
            fn to_json(&self) -> Option<Value> {
                Some(Value::Number((*self).into()))
            }
        }

        impl ToHeader for $ty {
            fn to_header(&self) -> Option<HeaderValue> {
                match HeaderValue::from_str(&format!("{}", self)) {
                    Ok(value) => Some(value),
                    Err(_) => None,
                }
            }
        }

        )*
    };
}

impl_type_for_integers!((i8, "int8"), (i16, "int16"), (i32, "int32"), (i64, "int64"));

impl_type_for_unsigneds!(
    (u8, "uint8"),
    (u16, "uint16"),
    (u32, "uint32"),
    (u64, "uint64"),
    (usize, "uint64")
);