use std::fmt::format;

use reqwest::{Response, dns::Resolving};
use serde::Deserialize;

use crate::query;

pub(crate) mod auth;
pub(crate) mod repo;
pub(crate) mod user;

#[derive(Clone)]
pub struct QueryContext {
    pub(crate) http: reqwest::Client,
    pub(crate) auth: Option<AuthTokens>,
    pub(crate) github: GithubCredentials,
}

#[derive(Clone)]
pub(crate) struct AuthTokens {
    pub(crate) access_token: String,
}

#[derive(Clone)]
pub(crate) struct GithubCredentials {
    pub(crate) base_url: &'static str,
    pub(crate) client_id: &'static str,
}

#[derive(Debug)]
pub(crate) enum Error {
    Unauthenticated,
    Github(GithubError),
    MalformedResponse(serde_json::Error),
    HttpError(reqwest::Error),
}

#[derive(Debug, Deserialize)]
pub(crate) struct GithubError {
    pub error: String,
    pub error_description: Option<String>,
    pub error_uri: Option<String>,
}

impl QueryContext {
    fn auth(&self) -> Result<&AuthTokens, Error> {
        self.auth.as_ref().ok_or(Error::Unauthenticated)
    }

    fn github_request(
        &self,
        method: reqwest::Method,
        url: &str,
    ) -> Result<reqwest::RequestBuilder, Error> {
        let auth = self.auth()?;
        Ok(self
            .http
            .request(method, format!("{}{}", self.github.base_url, url))
            .header("Accept", "application/vnd.github+json")
            .header("X-GitHub-Api-Version", "2026-03-10")
            .header("User-Agent", "kennethnym")
            .bearer_auth(&auth.access_token))
    }
}

impl query::Context for QueryContext {}

impl From<reqwest::Error> for Error {
    fn from(value: reqwest::Error) -> Self {
        Self::HttpError(value)
    }
}

impl From<serde_json::Error> for Error {
    fn from(value: serde_json::Error) -> Self {
        Self::MalformedResponse(value)
    }
}

async fn parse_response<T>(res: reqwest::Response) -> Result<T, Error>
where
    T: serde::de::DeserializeOwned,
{
    let status = res.status().clone();
    let data = res.bytes().await?;

    println!("[query] RES {:?} {:?}", status, str::from_utf8(&data));

    if status.is_success() {
        serde_json::from_slice::<T>(&data).map_err(|e| e.into())
    } else {
        serde_json::from_slice::<GithubError>(&data)
            .map_err(|e| e.into())
            .and_then(|e| {
                println!(
                    "[api parse error] invalid json, received: {:?}",
                    str::from_utf8(&data),
                );
                Err(Error::Github(e))
            })
    }
}