use crate::{
    cli::globals::GlobalArgs,
    s3::actions::{Action, response_error},
    s3::{S3, request},
};
use anyhow::{Result, anyhow};
use crossbeam::channel::Sender;
use reqwest::Method;
use std::{collections::BTreeMap, path::Path};

#[derive(Debug, Clone)]
pub struct StreamPart<'a> {
    key: &'a str,
    path: &'a Path,
    part_number: String,
    upload_id: &'a str,
    length: usize,
    digest: (&'a [u8], &'a [u8]),
    sender: Option<Sender<usize>>,
}

impl<'a> StreamPart<'a> {
    #[must_use]
    pub fn new(
        key: &'a str,
        path: &'a Path,
        part_number: u16,
        upload_id: &'a str,
        length: usize,
        digest: (&'a [u8], &'a [u8]),
        sender: Option<Sender<usize>>,
    ) -> Self {
        let pn = part_number.to_string();
        Self {
            key,
            path,
            part_number: pn,
            upload_id,
            length,
            digest,
            sender,
        }
    }

    /// # Errors
    ///
    /// Will return `Err` if can not make the request
    pub async fn request(self, s3: &S3, globals: &GlobalArgs) -> Result<String> {
        let (url, headers) =
            &self.sign(s3, self.digest.0, Some(self.digest.1), Some(self.length))?;

        let response = request::request(
            url.clone(),
            self.http_method()?,
            headers,
            Some(self.path),
            self.sender,
            globals.throttle,
        )
        .await?;

        if response.status().is_success() {
            match response.headers().get("ETag") {
                Some(etag) => Ok(etag.to_str()?.to_string()),
                None => Err(anyhow!("missing ETag")),
            }
        } else {
            Err(anyhow!(response_error(response).await?))
        }
    }
}

// https://docs.aws.amazon.com/AmazonS3/latest/API/API_UploadPart.html
impl Action for StreamPart<'_> {
    fn http_method(&self) -> Result<Method> {
        Ok(Method::from_bytes(b"PUT")?)
    }

    fn headers(&self) -> Option<BTreeMap<&str, &str>> {
        None
    }

    // URL query_pairs
    fn query_pairs(&self) -> Option<BTreeMap<&str, &str>> {
        let mut map: BTreeMap<&str, &str> = BTreeMap::new();
        map.insert("partNumber", &self.part_number);
        map.insert("uploadId", self.upload_id);
        Some(map)
    }

    fn path(&self) -> Option<Vec<&str>> {
        Some(self.key.split('/').collect())
    }
}

#[cfg(test)]
#[allow(
    clippy::unwrap_used,
    clippy::expect_used,
    clippy::panic,
    clippy::indexing_slicing,
    clippy::unnecessary_wraps
)]
mod tests {
    use super::*;
    use crate::s3::{
        tools, {Credentials, Region, S3},
    };
    use secrecy::SecretString;

    #[test]
    fn test_method() {
        let action = StreamPart::new("key", Path::new("/"), 1, "uid", 0, (b"sha", b"md5"), None);
        assert_eq!(Method::PUT, action.http_method().unwrap());
    }

    #[test]
    fn test_query_pairs() {
        let action = StreamPart::new("key", Path::new("/"), 1, "uid", 0, (b"sha", b"md5"), None);
        let mut map = BTreeMap::new();
        map.insert("partNumber", "1");
        map.insert("uploadId", "uid");
        assert_eq!(Some(map), action.query_pairs());
    }

    #[test]
    fn test_sign() {
        let s3 = S3::new(
            &Credentials::new(
                "AKIAIOSFODNN7EXAMPLE",
                &SecretString::new("wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY".into()),
            ),
            &"us-west-1".parse::<Region>().unwrap(),
            Some("awsexamplebucket1".to_string()),
            false,
        );

        let action = StreamPart::new("key", Path::new("/"), 1, "uid", 0, (b"sha", b"md5"), None);
        let (url, headers) = action
            .sign(&s3, tools::sha256_digest("").as_ref(), None, None)
            .unwrap();
        assert_eq!(
            "https://s3.us-west-1.amazonaws.com/awsexamplebucket1/key?partNumber=1&uploadId=uid",
            url.as_str()
        );
        assert!(
            headers
                .get("authorization")
                .unwrap()
                .starts_with("AWS4-HMAC-SHA256 Credential=AKIAIOSFODNN7EXAMPLE")
        );
    }
}
