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use std::iter;
use std::time::Duration;

use serde::Deserialize;
use time::OffsetDateTime;
use url::Url;

use crate::actions::Method;
use crate::actions::S3Action;
use crate::signing::sign;
use crate::sorting_iter::SortingIterator;
use crate::{Bucket, Credentials, Map};

/// Create a multipart upload.
///
/// A few advantages of multipart uploads are:
///
/// * being able to be resume without having to start back from the beginning
/// * parallelize the uploads across multiple threads
///
/// Find out more about `CreateMultipartUpload` from the [AWS API Reference][api]
///
/// [api]: https://docs.aws.amazon.com/AmazonS3/latest/API/API_CreateMultipartUpload.html
#[derive(Debug, Clone)]
pub struct CreateMultipartUpload<'a> {
    bucket: &'a Bucket,
    credentials: Option<&'a Credentials>,
    object: &'a str,

    query: Map<'a>,
    headers: Map<'a>,
}

#[derive(Debug, Clone)]
pub struct CreateMultipartUploadResponse(InnerCreateMultipartUploadResponse);

#[derive(Debug, Clone, Deserialize)]
struct InnerCreateMultipartUploadResponse {
    #[serde(rename = "UploadId")]
    upload_id: String,
}

impl<'a> CreateMultipartUpload<'a> {
    #[inline]
    pub fn new(bucket: &'a Bucket, credentials: Option<&'a Credentials>, object: &'a str) -> Self {
        Self {
            bucket,
            credentials,
            object,

            query: Map::new(),
            headers: Map::new(),
        }
    }

    pub fn parse_response(s: &str) -> Result<CreateMultipartUploadResponse, quick_xml::DeError> {
        let parsed = quick_xml::de::from_str(s)?;
        Ok(CreateMultipartUploadResponse(parsed))
    }
}

impl CreateMultipartUploadResponse {
    pub fn upload_id(&self) -> &str {
        &self.0.upload_id
    }
}

impl<'a> S3Action<'a> for CreateMultipartUpload<'a> {
    const METHOD: Method = Method::Post;

    fn query_mut(&mut self) -> &mut Map<'a> {
        &mut self.query
    }

    fn headers_mut(&mut self) -> &mut Map<'a> {
        &mut self.headers
    }

    fn sign_with_time(&self, expires_in: Duration, time: &OffsetDateTime) -> Url {
        let url = self.bucket.object_url(self.object).unwrap();
        let query = iter::once(("uploads", "1"));

        match self.credentials {
            Some(credentials) => sign(
                time,
                Method::Post,
                url,
                credentials.key(),
                credentials.secret(),
                credentials.token(),
                self.bucket.region(),
                expires_in.as_secs(),
                SortingIterator::new(query, self.query.iter()),
                self.headers.iter(),
            ),
            None => crate::signing::util::add_query_params(url, query),
        }
    }
}

#[cfg(test)]
mod tests {
    use time::OffsetDateTime;

    use pretty_assertions::assert_eq;

    use super::*;
    use crate::{Bucket, Credentials, UrlStyle};

    #[test]
    fn aws_example() {
        // Fri, 24 May 2013 00:00:00 GMT
        let date = OffsetDateTime::from_unix_timestamp(1369353600).unwrap();
        let expires_in = Duration::from_secs(86400);

        let endpoint = "https://s3.amazonaws.com".parse().unwrap();
        let bucket = Bucket::new(
            endpoint,
            UrlStyle::VirtualHost,
            "examplebucket",
            "us-east-1",
        )
        .unwrap();
        let credentials = Credentials::new(
            "AKIAIOSFODNN7EXAMPLE",
            "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY",
        );

        let action = CreateMultipartUpload::new(&bucket, Some(&credentials), "test.txt");

        let url = action.sign_with_time(expires_in, &date);
        let expected = "https://examplebucket.s3.amazonaws.com/test.txt?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIOSFODNN7EXAMPLE%2F20130524%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20130524T000000Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&uploads=1&X-Amz-Signature=a6289f9e5ff2a914c6e324403bcd00b1d258c568487faa50d317ef0910c25c0a";

        assert_eq!(expected, url.as_str());
    }

    #[test]
    fn anonymous_custom_query() {
        let expires_in = Duration::from_secs(86400);

        let endpoint = "https://s3.amazonaws.com".parse().unwrap();
        let bucket = Bucket::new(
            endpoint,
            UrlStyle::VirtualHost,
            "examplebucket",
            "us-east-1",
        )
        .unwrap();

        let action = CreateMultipartUpload::new(&bucket, None, "test.txt");
        let url = action.sign(expires_in);
        let expected = "https://examplebucket.s3.amazonaws.com/test.txt?uploads=1";

        assert_eq!(expected, url.as_str());
    }
}