// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

use std::fmt::Debug;
use std::sync::Arc;

use http::header;
use http::Request;
use http::Response;
use http::StatusCode;

use super::error::parse_error;
use super::writer::VercelArtifactsWriter;
use crate::raw::*;
use crate::*;

#[doc = include_str!("docs.md")]
#[derive(Clone)]
pub struct VercelArtifactsBackend {
    pub(crate) access_token: String,
    pub(crate) client: HttpClient,
}

impl Debug for VercelArtifactsBackend {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let mut de = f.debug_struct("VercelArtifactsBackend");
        de.field("access_token", &self.access_token);
        de.finish()
    }
}

impl Access for VercelArtifactsBackend {
    type Reader = HttpBody;
    type Writer = oio::OneShotWriter<VercelArtifactsWriter>;
    type Lister = ();
    type Deleter = ();
    type BlockingReader = ();
    type BlockingWriter = ();
    type BlockingLister = ();
    type BlockingDeleter = ();

    fn info(&self) -> Arc<AccessorInfo> {
        let mut ma = AccessorInfo::default();
        ma.set_scheme(Scheme::VercelArtifacts)
            .set_native_capability(Capability {
                stat: true,
                stat_has_cache_control: true,
                stat_has_content_length: true,
                stat_has_content_type: true,
                stat_has_content_encoding: true,
                stat_has_content_range: true,
                stat_has_etag: true,
                stat_has_content_md5: true,
                stat_has_last_modified: true,
                stat_has_content_disposition: true,

                read: true,

                write: true,

                shared: true,

                ..Default::default()
            });

        ma.into()
    }

    async fn stat(&self, path: &str, _args: OpStat) -> Result<RpStat> {
        let res = self.vercel_artifacts_stat(path).await?;

        let status = res.status();

        match status {
            StatusCode::OK => {
                let meta = parse_into_metadata(path, res.headers())?;
                Ok(RpStat::new(meta))
            }

            _ => Err(parse_error(res)),
        }
    }

    async fn read(&self, path: &str, args: OpRead) -> Result<(RpRead, Self::Reader)> {
        let resp = self.vercel_artifacts_get(path, args.range(), &args).await?;

        let status = resp.status();

        match status {
            StatusCode::OK | StatusCode::PARTIAL_CONTENT => Ok((RpRead::new(), resp.into_body())),
            _ => {
                let (part, mut body) = resp.into_parts();
                let buf = body.to_buffer().await?;
                Err(parse_error(Response::from_parts(part, buf)))
            }
        }
    }

    async fn write(&self, path: &str, args: OpWrite) -> Result<(RpWrite, Self::Writer)> {
        Ok((
            RpWrite::default(),
            oio::OneShotWriter::new(VercelArtifactsWriter::new(
                self.clone(),
                args,
                path.to_string(),
            )),
        ))
    }
}

impl VercelArtifactsBackend {
    pub async fn vercel_artifacts_get(
        &self,
        hash: &str,
        range: BytesRange,
        _: &OpRead,
    ) -> Result<Response<HttpBody>> {
        let url: String = format!(
            "https://api.vercel.com/v8/artifacts/{}",
            percent_encode_path(hash)
        );

        let mut req = Request::get(&url);

        if !range.is_full() {
            req = req.header(header::RANGE, range.to_header());
        }

        let auth_header_content = format!("Bearer {}", self.access_token);
        req = req.header(header::AUTHORIZATION, auth_header_content);

        let req = req.body(Buffer::new()).map_err(new_request_build_error)?;

        self.client.fetch(req).await
    }

    pub async fn vercel_artifacts_put(
        &self,
        hash: &str,
        size: u64,
        body: Buffer,
    ) -> Result<Response<Buffer>> {
        let url = format!(
            "https://api.vercel.com/v8/artifacts/{}",
            percent_encode_path(hash)
        );

        let mut req = Request::put(&url);

        let auth_header_content = format!("Bearer {}", self.access_token);
        req = req.header(header::CONTENT_TYPE, "application/octet-stream");
        req = req.header(header::AUTHORIZATION, auth_header_content);
        req = req.header(header::CONTENT_LENGTH, size);

        let req = req.body(body).map_err(new_request_build_error)?;

        self.client.send(req).await
    }

    pub async fn vercel_artifacts_stat(&self, hash: &str) -> Result<Response<Buffer>> {
        let url = format!(
            "https://api.vercel.com/v8/artifacts/{}",
            percent_encode_path(hash)
        );

        let mut req = Request::head(&url);

        let auth_header_content = format!("Bearer {}", self.access_token);
        req = req.header(header::AUTHORIZATION, auth_header_content);
        req = req.header(header::CONTENT_LENGTH, 0);

        let req = req.body(Buffer::new()).map_err(new_request_build_error)?;

        self.client.send(req).await
    }
}