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use crate::prelude::full;
use crate::{Handler, Request, Response, SilentError, StatusCode};
use async_trait::async_trait;

struct HandlerWrapperStatic {
    path: String,
}

impl Default for HandlerWrapperStatic {
    fn default() -> Self {
        Self::new(".")
    }
}

impl HandlerWrapperStatic {
    fn new(path: &str) -> Self {
        let mut path = path;
        if path.ends_with('/') {
            path = &path[..path.len() - 1];
        }
        if !std::path::Path::new(path).is_dir() {
            panic!("Path not exists: {}", path);
        }
        Self {
            path: path.to_string(),
        }
    }
}

#[async_trait]
impl Handler for HandlerWrapperStatic {
    async fn call(&self, req: Request) -> Result<Response, SilentError> {
        if let Ok(file_path) = req.get_path_params::<String>("path") {
            let mut path = format!("{}/{}", self.path, file_path);
            if path.ends_with('/') {
                path.push_str("index.html");
            }
            if let Ok(contents) = tokio::fs::read(path).await {
                let mut res = Response::empty();
                res.set_body(full(contents));
                return Ok(res);
            }
        }
        Err(SilentError::BusinessError {
            code: StatusCode::NOT_FOUND,
            msg: "Not Found".to_string(),
        })
    }
}

pub fn static_handler(path: &str) -> impl Handler {
    HandlerWrapperStatic::new(path)
}

#[cfg(test)]
mod tests {
    use super::HandlerWrapperStatic;
    use crate::prelude::*;
    use crate::Handler;
    use crate::Request;
    use crate::SilentError;
    use crate::StatusCode;
    use bytes::Bytes;
    use http_body_util::BodyExt;

    static CONTENT: &str = r#"<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Silent</title>
</head>
<body>

<h1>我的第一个标题</h1>

<p>我的第一个段落。</p>

</body>
</html>"#;

    fn create_static(path: &str) {
        if !std::path::Path::new(path).is_dir() {
            std::fs::create_dir(path).unwrap();
            std::fs::write(format!("./{}/index.html", path), CONTENT).unwrap();
        }
    }

    fn clean_static(path: &str) {
        if std::path::Path::new(path).is_dir() {
            std::fs::remove_file(format!("./{}/index.html", path)).unwrap();
            std::fs::remove_dir(path).unwrap();
        }
    }

    #[tokio::test]
    async fn test_static() {
        let path = "test_static";
        create_static(path);
        let handler = HandlerWrapperStatic::new(path);
        let mut req = Request::default();
        req.set_path_params("path".to_owned(), PathParam::Path("index.html".to_string()));
        let mut res = handler.call(req).await.unwrap();
        clean_static(path);
        assert_eq!(res.status_code, StatusCode::OK);
        assert_eq!(
            res.body.frame().await.unwrap().unwrap().data_ref().unwrap(),
            &Bytes::from(CONTENT)
        );
    }

    #[tokio::test]
    async fn test_static_default() {
        let path = "test_static_default";
        create_static(path);
        let handler = HandlerWrapperStatic::new(path);
        let mut req = Request::default();
        req.set_path_params("path".to_owned(), PathParam::Path("".to_string()));
        let mut res = handler.call(req).await.unwrap();
        clean_static(path);
        assert_eq!(res.status_code, StatusCode::OK);
        assert_eq!(
            res.body.frame().await.unwrap().unwrap().data_ref().unwrap(),
            &Bytes::from(CONTENT)
        );
    }

    #[tokio::test]
    async fn test_static_not_found() {
        let path = "test_static_not_found";
        create_static(path);
        let handler = HandlerWrapperStatic::new(path);
        let mut req = Request::default();
        req.set_path_params(
            "path".to_owned(),
            PathParam::Path("not_found.html".to_string()),
        );
        let res = handler.call(req).await.unwrap_err();
        clean_static(path);
        if let SilentError::BusinessError { code, .. } = res {
            assert_eq!(code, StatusCode::NOT_FOUND);
        } else {
            panic!();
        }
    }
}