use failure::*;

use crate::tools;
use crate::backup::datastore::*;
use crate::backup::archive_index::*;
//use crate::server::rest::*;
use crate::api::schema::*;
use crate::api::router::*;

use serde_json::Value;
use std::io::Write;
use futures::*;
use std::path::PathBuf;

use hyper::Body;
use hyper::http::request::Parts;

pub struct UploadCaTar {
    stream: Body,
    index: ArchiveIndexWriter,
    count: usize,
}

impl Future for UploadCaTar {
    type Item = ();
    type Error = failure::Error;

    fn poll(&mut self) -> Poll<(), failure::Error> {
        loop {
            match try_ready!(self.stream.poll()) {
                Some(chunk) => {
                    self.count += chunk.len();
                    if let Err(err) = self.index.write(&chunk) {
                        bail!("writing chunk failed - {}", err);
                    }
                }
                None => {
                    self.index.close()?;
                    return Ok(Async::Ready(()))
                }
            }
        }
    }
}

fn upload_catar(parts: Parts, req_body: Body, param: Value, _info: &ApiUploadMethod) -> Result<BoxFut, Error> {

    let store = tools::required_string_param(&param, "store")?;
    let archive_name = tools::required_string_param(&param, "archive_name")?;

    println!("Upload {}.catar to {} ({}.aidx)", archive_name, store, archive_name);

    let content_type = parts.headers.get(http::header::CONTENT_TYPE)
        .ok_or(format_err!("missing content-type header"))?;

    if content_type != "application/x-proxmox-backup-catar" {
        bail!("got wrong content-type for catar archive upload");
    }

    let chunk_size = 4*1024*1024;

    let datastore = DataStore::lookup_datastore(store)?;

    let mut full_archive_name = PathBuf::from(archive_name);
    full_archive_name.set_extension("aidx");

    let index = datastore.create_archive_writer(&full_archive_name, chunk_size).unwrap();

    let upload = UploadCaTar { stream: req_body, index, count: 0};

    let resp = upload.and_then(|_| {

        let response = http::Response::builder()
            .status(200)
            .body(hyper::Body::empty())
            .unwrap();

        Ok(response)
    });

    Ok(Box::new(resp))
}

pub fn api_method_upload_catar() -> ApiUploadMethod {
    ApiUploadMethod::new(
        upload_catar,
        ObjectSchema::new("Upload .catar backup file.")
            .required("store", StringSchema::new("Datastore name."))
            .required("archive_name", StringSchema::new("Backup archive name."))
    )
}