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use std::error;

use http_api_client_endpoint::{Body, Endpoint, Request, Response};
use oauth2_core::{
    access_token_response::GENERAL_ERROR_BODY_KEY_ERROR,
    device_authorization_grant::{
        device_authorization_request::{
            Body as REQ_Body, CONTENT_TYPE as REQ_CONTENT_TYPE, METHOD as REQ_METHOD,
        },
        device_authorization_response::{
            ErrorBody as RES_ErrorBody, SuccessfulBody as RES_SuccessfulBody,
            CONTENT_TYPE as RES_CONTENT_TYPE,
        },
    },
    http::{
        header::{ACCEPT, CONTENT_TYPE},
        Error as HttpError,
    },
    serde::Serialize,
    types::Scope,
};
use serde_json::{Error as SerdeJsonError, Map, Value};
use serde_urlencoded::ser::Error as SerdeUrlencodedSerError;

use crate::ProviderExtDeviceAuthorizationGrant;

//
#[derive(Clone)]
pub struct DeviceAuthorizationEndpoint<'a, SCOPE>
where
    SCOPE: Scope,
{
    provider: &'a (dyn ProviderExtDeviceAuthorizationGrant<Scope = SCOPE> + Send + Sync),
    scopes: Option<Vec<SCOPE>>,
}
impl<'a, SCOPE> DeviceAuthorizationEndpoint<'a, SCOPE>
where
    SCOPE: Scope,
{
    pub fn new(
        provider: &'a (dyn ProviderExtDeviceAuthorizationGrant<Scope = SCOPE> + Send + Sync),
        scopes: impl Into<Option<Vec<SCOPE>>>,
    ) -> Self {
        Self {
            provider,
            scopes: scopes.into(),
        }
    }
}

impl<'a, SCOPE> Endpoint for DeviceAuthorizationEndpoint<'a, SCOPE>
where
    SCOPE: Scope + Serialize,
{
    type RenderRequestError = DeviceAuthorizationEndpointError;

    type ParseResponseOutput = Result<RES_SuccessfulBody, RES_ErrorBody>;
    type ParseResponseError = DeviceAuthorizationEndpointError;

    fn render_request(&self) -> Result<Request<Body>, Self::RenderRequestError> {
        let mut body = REQ_Body::new(
            self.provider.client_id().cloned(),
            self.scopes.to_owned().map(Into::into),
        );
        if let Some(extra) = self.provider.device_authorization_request_body_extra() {
            body.set_extra(extra);
        }

        if let Some(request_ret) = self.provider.device_authorization_request_rendering(&body) {
            let request = request_ret.map_err(|err| {
                DeviceAuthorizationEndpointError::CustomRenderingRequestFailed(err)
            })?;
            return Ok(request);
        }

        let body_str = serde_urlencoded::to_string(body)
            .map_err(DeviceAuthorizationEndpointError::SerRequestBodyFailed)?;

        let request = Request::builder()
            .method(REQ_METHOD)
            .uri(self.provider.device_authorization_endpoint_url().as_str())
            .header(CONTENT_TYPE, REQ_CONTENT_TYPE.to_string())
            .header(ACCEPT, RES_CONTENT_TYPE.to_string())
            .body(body_str.as_bytes().to_vec())
            .map_err(DeviceAuthorizationEndpointError::MakeRequestFailed)?;

        Ok(request)
    }

    fn parse_response(
        &self,
        response: Response<Body>,
    ) -> Result<Self::ParseResponseOutput, Self::ParseResponseError> {
        if let Some(body_ret_ret) = self
            .provider
            .device_authorization_response_parsing(&response)
        {
            let body_ret = body_ret_ret.map_err(|err| {
                DeviceAuthorizationEndpointError::CustomParsingResponseFailed(err)
            })?;

            return Ok(body_ret);
        }

        if response.status().is_success() {
            let map = serde_json::from_slice::<Map<String, Value>>(response.body())
                .map_err(DeviceAuthorizationEndpointError::DeResponseBodyFailed)?;
            if !map.contains_key(GENERAL_ERROR_BODY_KEY_ERROR) {
                let body = serde_json::from_slice::<RES_SuccessfulBody>(response.body())
                    .map_err(DeviceAuthorizationEndpointError::DeResponseBodyFailed)?;

                return Ok(Ok(body));
            }
        }

        let body = serde_json::from_slice::<RES_ErrorBody>(response.body())
            .map_err(DeviceAuthorizationEndpointError::DeResponseBodyFailed)?;
        Ok(Err(body))
    }
}

#[derive(thiserror::Error, Debug)]
pub enum DeviceAuthorizationEndpointError {
    #[error("CustomRenderingRequestFailed {0}")]
    CustomRenderingRequestFailed(Box<dyn error::Error + Send + Sync>),
    //
    #[error("SerRequestBodyFailed {0}")]
    SerRequestBodyFailed(SerdeUrlencodedSerError),
    #[error("MakeRequestFailed {0}")]
    MakeRequestFailed(HttpError),
    //
    #[error("CustomParsingResponseFailed {0}")]
    CustomParsingResponseFailed(Box<dyn error::Error + Send + Sync>),
    //
    #[error("DeResponseBodyFailed {0}")]
    DeResponseBodyFailed(SerdeJsonError),
}