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use reqwest::{Client, Request, StatusCode};
use serde::{de::DeserializeOwned, Serialize};
use soft_assert::*;
use url::Url;

pub struct Forgejo {
    url: Url,
    client: Client,
}

mod issue;
mod repository;
mod user;

pub use issue::*;
pub use repository::*;
pub use user::*;

#[derive(thiserror::Error, Debug)]
pub enum ForgejoError {
    #[error("url must have a host")]
    HostRequired,
    #[error("scheme must be http or https")]
    HttpRequired,
    #[error("{0}")] // for some reason, you can't use `source` and `transparent` together
    ReqwestError(#[source] reqwest::Error),
    #[error("API key should be ascii")]
    KeyNotAscii,
    #[error("the response from forgejo was not properly structured")]
    BadStructure,
    #[error("unexpected status code {} {}", .0.as_u16(), .0.canonical_reason().unwrap_or(""))]
    UnexpectedStatusCode(StatusCode),
    #[error("{} {}: {}", .0.as_u16(), .0.canonical_reason().unwrap_or(""), .1)]
    ApiError(StatusCode, String),
}

impl From<reqwest::Error> for ForgejoError {
    fn from(e: reqwest::Error) -> Self {
        if e.is_decode() {
            ForgejoError::BadStructure
        } else {
            ForgejoError::ReqwestError(e)
        }
    }
}

impl Forgejo {
    pub fn new(api_key: &str, url: Url) -> Result<Self, ForgejoError> {
        Self::with_user_agent(api_key, url, "forgejo-api-rs")
    }

    pub fn with_user_agent(
        api_key: &str,
        url: Url,
        user_agent: &str,
    ) -> Result<Self, ForgejoError> {
        soft_assert!(
            matches!(url.scheme(), "http" | "https"),
            Err(ForgejoError::HttpRequired)
        );

        let mut headers = reqwest::header::HeaderMap::new();
        let mut key_header: reqwest::header::HeaderValue = format!("token {api_key}")
            .try_into()
            .map_err(|_| ForgejoError::KeyNotAscii)?;
        // key_header.set_sensitive(true);
        headers.insert("Authorization", key_header);
        let client = Client::builder()
            .user_agent(user_agent)
            .default_headers(headers)
            .build()?;
        dbg!(&client);
        Ok(Self { url, client })
    }

    async fn get<T: DeserializeOwned>(&self, path: &str) -> Result<T, ForgejoError> {
        let url = self.url.join("api/v1/").unwrap().join(path).unwrap();
        let request = self.client.get(url).build()?;
        self.execute(request).await
    }

    async fn get_opt<T: DeserializeOwned>(&self, path: &str) -> Result<Option<T>, ForgejoError> {
        let url = self.url.join("api/v1/").unwrap().join(path).unwrap();
        let request = self.client.get(url).build()?;
        self.execute_opt(request).await
    }

    async fn post<T: Serialize, U: DeserializeOwned>(
        &self,
        path: &str,
        body: &T,
    ) -> Result<U, ForgejoError> {
        let url = self.url.join("api/v1/").unwrap().join(path).unwrap();
        let request = self.client.post(url).json(body).build()?;
        self.execute(request).await
    }

    async fn execute<T: DeserializeOwned>(&self, request: Request) -> Result<T, ForgejoError> {
        let response = self.client.execute(dbg!(request)).await?;
        match response.status() {
            status if status.is_success() => Ok(response.json::<T>().await?),
            status if status.is_client_error() => Err(ForgejoError::ApiError(
                status,
                response.json::<ErrorMessage>().await?.message,
            )),
            status => Err(ForgejoError::UnexpectedStatusCode(status)),
        }
    }

    /// Like `execute`, but returns `Ok(None)` on 404.
    async fn execute_opt<T: DeserializeOwned>(
        &self,
        request: Request,
    ) -> Result<Option<T>, ForgejoError> {
        let response = self.client.execute(dbg!(request)).await?;
        match response.status() {
            status if status.is_success() => Ok(Some(response.json::<T>().await?)),
            StatusCode::NOT_FOUND => Ok(None),
            status if status.is_client_error() => Err(ForgejoError::ApiError(
                status,
                response.json::<ErrorMessage>().await?.message,
            )),
            status => Err(ForgejoError::UnexpectedStatusCode(status)),
        }
    }
}

#[derive(serde::Deserialize)]
struct ErrorMessage {
    message: String,
    // intentionally ignored, no need for now
    // url: Url
}