/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

use std::ops::Deref;

use headers::{ContentType, HeaderMapExt};
use hyper_serde::Serde;
use mime::{self, Mime};
use net_traits::request::Referrer;
use net_traits::response::ResponseBody;
use net_traits::{FetchMetadata, FilteredMetadata, NetworkError};
use servo_url::ServoUrl;

use crate::fetch;

#[cfg(test)]
fn assert_parse(
    url: &'static str,
    content_type: Option<ContentType>,
    charset: Option<&str>,
    data: Option<&[u8]>,
) {
    use net_traits::request::RequestBuilder;

    let url = ServoUrl::parse(url).unwrap();
    let request = RequestBuilder::new(None, url.clone(), Referrer::NoReferrer)
        .origin(url.origin())
        .pipeline_id(None)
        .build();

    let response = fetch(request, None);

    match data {
        Some(data) => {
            assert!(!response.is_network_error());
            assert_eq!(response.headers.len(), 1);

            let header_content_type = response.headers.typed_get::<ContentType>();
            assert_eq!(header_content_type, content_type);

            let metadata = match response.metadata() {
                Ok(FetchMetadata::Filtered {
                    filtered: FilteredMetadata::Basic(m),
                    ..
                }) => m,
                result => panic!("{:?}", result),
            };
            assert_eq!(metadata.content_type.map(Serde::into_inner), content_type);
            assert_eq!(metadata.charset.as_ref().map(String::deref), charset);

            let resp_body = response.body.lock().unwrap();
            match *resp_body {
                ResponseBody::Done(ref val) => {
                    assert_eq!(val, &data);
                },
                _ => panic!(),
            }
        },
        None => {
            assert!(response.is_network_error());
            assert_eq!(
                response.metadata().err(),
                Some(NetworkError::Internal(
                    "Decoding data URL failed".to_owned()
                ))
            );
        },
    }
}

#[test]
fn empty_invalid() {
    assert_parse("data:", None, None, None);
}

#[test]
fn plain() {
    assert_parse(
        "data:,hello%20world",
        Some(ContentType::from(
            "text/plain; charset=US-ASCII".parse::<Mime>().unwrap(),
        )),
        Some("us-ascii"),
        Some(b"hello world"),
    );
}

#[test]
fn plain_ct() {
    assert_parse(
        "data:text/plain,hello",
        Some(ContentType::from(mime::TEXT_PLAIN)),
        None,
        Some(b"hello"),
    );
}

#[test]
fn plain_html() {
    assert_parse(
        "data:text/html,<p>Servo</p>",
        Some(ContentType::from(mime::TEXT_HTML)),
        None,
        Some(b"<p>Servo</p>"),
    );
}

#[test]
fn plain_charset() {
    assert_parse(
        "data:text/plain;charset=latin1,hello",
        Some(ContentType::from(
            "text/plain; charset=latin1".parse::<Mime>().unwrap(),
        )),
        Some("latin1"),
        Some(b"hello"),
    );
}

#[test]
fn plain_only_charset() {
    assert_parse(
        "data:;charset=utf-8,hello",
        Some(ContentType::from(mime::TEXT_PLAIN_UTF_8)),
        Some("utf-8"),
        Some(b"hello"),
    );
}

#[test]
fn base64() {
    assert_parse(
        "data:;base64,C62+7w==",
        Some(ContentType::from(
            "text/plain; charset=US-ASCII".parse::<Mime>().unwrap(),
        )),
        Some("us-ascii"),
        Some(&[0x0B, 0xAD, 0xBE, 0xEF]),
    );
}

#[test]
fn base64_ct() {
    assert_parse(
        "data:application/octet-stream;base64,C62+7w==",
        Some(ContentType::from(mime::APPLICATION_OCTET_STREAM)),
        None,
        Some(&[0x0B, 0xAD, 0xBE, 0xEF]),
    );
}

#[test]
fn base64_charset() {
    assert_parse(
        "data:text/plain;charset=koi8-r;base64,8PLl9+XkIO3l5Pfl5A==",
        Some(ContentType::from(
            "text/plain; charset=koi8-r".parse::<Mime>().unwrap(),
        )),
        Some("koi8-r"),
        Some(&[
            0xF0, 0xF2, 0xE5, 0xF7, 0xE5, 0xE4, 0x20, 0xED, 0xE5, 0xE4, 0xF7, 0xE5, 0xE4,
        ]),
    );
}