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use std::ops::{Deref, DerefMut};

use poem::{FromRequest, IntoResponse, Request, RequestBody, Response};

use crate::{
    payload::{ParsePayload, Payload},
    registry::{MetaMediaType, MetaResponse, MetaResponses, MetaSchemaRef, Registry},
    types::Type,
    ApiResponse, ParseRequestError,
};

/// A UTF8 string payload.
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct PlainText<T>(pub T);

impl<T> Deref for PlainText<T> {
    type Target = T;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

impl<T> DerefMut for PlainText<T> {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.0
    }
}

impl<T: Send> Payload for PlainText<T> {
    const CONTENT_TYPE: &'static str = "text/plain";

    fn schema_ref() -> MetaSchemaRef {
        String::schema_ref()
    }
}

#[poem::async_trait]
impl ParsePayload for PlainText<String> {
    const IS_REQUIRED: bool = false;

    async fn from_request(
        request: &Request,
        body: &mut RequestBody,
    ) -> Result<Self, ParseRequestError> {
        Ok(Self(String::from_request(request, body).await.map_err(
            |err| ParseRequestError::ParseRequestBody(err.into_response()),
        )?))
    }
}

impl<T: Into<String> + Send> IntoResponse for PlainText<T> {
    fn into_response(self) -> Response {
        Response::builder()
            .content_type(Self::CONTENT_TYPE)
            .body(self.0.into())
    }
}

impl<T: Into<String> + Send> ApiResponse for PlainText<T> {
    fn meta() -> MetaResponses {
        MetaResponses {
            responses: vec![MetaResponse {
                description: "",
                status: Some(200),
                content: vec![MetaMediaType {
                    content_type: Self::CONTENT_TYPE,
                    schema: Self::schema_ref(),
                }],
                headers: vec![],
            }],
        }
    }

    fn register(_registry: &mut Registry) {}
}

impl_apirequest_for_payload!(PlainText<String>);