use isahc::{config::RedirectPolicy, prelude::*, Body, HttpClient, Request};
use test_case::test_case;
use testserver::mock;

#[test]
fn response_301_no_follow() {
    let m = mock! {
        status: 301,
        headers {
            "Location": "/2",
        }
    };

    let response = isahc::get(m.url()).unwrap();

    assert_eq!(response.status(), 301);
    assert_eq!(response.headers()["Location"], "/2");
    assert_eq!(response.effective_uri().unwrap().path(), "/");

    assert_eq!(m.requests_received(), 1);
}

#[test]
fn response_301_auto_follow() {
    let m2 = mock! {
        status: 200,
        body: "ok",
    };
    let location = m2.url();

    let m1 = mock! {
        status: 301,
        headers {
            "Location": location,
        }
    };

    let mut response = Request::get(m1.url())
        .redirect_policy(RedirectPolicy::Follow)
        .body(())
        .unwrap()
        .send()
        .unwrap();

    assert_eq!(response.status(), 200);
    assert_eq!(response.text().unwrap(), "ok");
    assert_eq!(response.effective_uri().unwrap().to_string(), m2.url());

    assert_eq!(m1.requests_received(), 1);
    assert_eq!(m2.requests_received(), 1);
}

#[test]
fn headers_are_reset_every_redirect() {
    let m2 = mock! {
        status: 200,
        headers {
            "X-Foo": "bbb",
            "X-Baz": "zzz",
        }
    };
    let location = m2.url();

    let m1 = mock! {
        status: 301,
        headers {
            "Location": location,
            "X-Foo": "aaa",
            "X-Bar": "zzz",
        }
    };

    let response = Request::get(m1.url())
        .redirect_policy(RedirectPolicy::Follow)
        .body(())
        .unwrap()
        .send()
        .unwrap();

    assert_eq!(response.status(), 200);
    assert_eq!(response.headers()["X-Foo"], "bbb");
    assert_eq!(response.headers()["X-Baz"], "zzz");
    assert!(!response.headers().contains_key("X-Bar"));

    assert_eq!(m1.requests_received(), 1);
    assert_eq!(m2.requests_received(), 1);
}

#[test_case(301)]
#[test_case(302)]
#[test_case(303)]
fn redirect_changes_post_to_get(status: u16) {
    let m2 = mock!();
    let location = m2.url();

    let m1 = mock! {
        status: status,
        headers {
            "Location": location,
        }
    };

    let response = Request::post(m1.url())
        .redirect_policy(RedirectPolicy::Follow)
        .body(())
        .unwrap()
        .send()
        .unwrap();

    assert_eq!(response.status(), 200);
    assert_eq!(response.effective_uri().unwrap().to_string(), m2.url());

    assert_eq!(m1.request().method(), "POST");
    assert_eq!(m2.request().method(), "GET");
}

#[test_case(307)]
#[test_case(308)]
fn redirect_also_sends_post(status: u16) {
    let m2 = mock!();
    let location = m2.url();

    let m1 = mock! {
        status: status,
        headers {
            "Location": location,
        }
    };

    let response = Request::post(m1.url())
        .redirect_policy(RedirectPolicy::Follow)
        .body(())
        .unwrap()
        .send()
        .unwrap();

    assert_eq!(response.status(), 200);
    assert_eq!(response.effective_uri().unwrap().to_string(), m2.url());

    assert_eq!(m1.request().method(), "POST");
    assert_eq!(m2.request().method(), "POST");
}

// Issue #250
#[test]
fn redirect_with_response_body() {
    let m2 = mock! {
        body: "OK",
    };
    let location = m2.url();

    let m1 = mock! {
        status: 302,
        headers {
            "Location": location,
        }
        body: "REDIRECT",
    };

    let response = Request::post(m1.url())
        .redirect_policy(RedirectPolicy::Follow)
        .body(())
        .unwrap()
        .send()
        .unwrap();

    assert_eq!(response.status(), 200);
    assert_eq!(response.effective_uri().unwrap().to_string(), m2.url());

    assert_eq!(m1.request().method(), "POST");
    assert_eq!(m2.request().method(), "GET");
}

// Issue #250
#[test]
fn redirect_policy_from_client() {
    let m2 = mock!();
    let location = m2.url();

    let m1 = mock! {
        status: 302,
        headers {
            "Location": location,
        }
    };

    let client = HttpClient::builder()
        .redirect_policy(RedirectPolicy::Limit(8))
        .build()
        .unwrap();

    let response = client.post(m1.url(), ()).unwrap();

    assert_eq!(response.status(), 200);
    assert_eq!(response.effective_uri().unwrap().to_string(), m2.url());

    assert_eq!(m1.request().method(), "POST");
    assert_eq!(m2.request().method(), "GET");
}

#[test]
fn redirect_non_rewindable_body_returns_error() {
    let m2 = mock!();
    let location = m2.url();

    let m1 = mock! {
        status: 307,
        headers {
            "Location": location,
        }
    };

    // Create a streaming body of unknown size.
    let upload_stream = Body::from_reader(Body::from_bytes_static(b"hello world"));

    let error = Request::post(m1.url())
        .redirect_policy(RedirectPolicy::Follow)
        .body(upload_stream)
        .unwrap()
        .send()
        .unwrap_err();

    assert_eq!(error, isahc::error::ErrorKind::RequestBodyNotRewindable);
    assert_eq!(error.remote_addr(), Some(m1.addr()));
    assert_eq!(m1.request().method(), "POST");
}

#[test]
fn redirect_limit_is_respected() {
    let m = mock! {
        status: 301,
        headers {
            "Location": "/next",
        }
    };

    let error = Request::get(m.url())
        .redirect_policy(RedirectPolicy::Limit(5))
        .body(())
        .unwrap()
        .send()
        .unwrap_err();

    // Request should error with too many redirects.
    assert_eq!(error, isahc::error::ErrorKind::TooManyRedirects);
    assert_eq!(error.remote_addr(), Some(m.addr()));

    // After request (limit + 1) that returns a redirect should error.
    assert_eq!(m.requests_received(), 6);
}

#[test]
fn auto_referer_sets_expected_header() {
    let m3 = mock!();

    let m2 = {
        let location = m3.url();
        mock! {
            status: 301,
            headers {
                "Location": location,
            }
        }
    };

    let m1 = {
        let location = format!("{}#foo", m2.url());
        mock! {
            status: 301,
            headers {
                "Location": location,
            }
        }
    };

    Request::get(m1.url())
        .redirect_policy(RedirectPolicy::Follow)
        .auto_referer()
        .body(())
        .unwrap()
        .send()
        .unwrap();

    assert_eq!(m1.request().get_header("Referer").count(), 0);
    assert_eq!(m2.request().get_header("Referer").collect::<Vec<_>>(), vec![m1.url()]);
    assert_eq!(m3.request().get_header("Referer").collect::<Vec<_>>(), vec![m2.url()]);
}

#[test]
#[ignore = "testserver does not support non-ASCII headers yet"]
fn redirect_with_unencoded_utf8_bytes_in_location() {
    let m2 = mock! {
        status: 200,
        body: "ok",
    };

    // Put literal non-ASCII UTF-8 characters into the location!
    let location = m2.url() + "?bad=résumé";

    let m1 = mock! {
        status: 301,
        headers {
            "Location": location,
        }
    };

    let mut response = Request::get(m1.url())
        .redirect_policy(RedirectPolicy::Follow)
        .body(())
        .unwrap()
        .send()
        .unwrap();

    assert_eq!(response.status(), 200);
    assert_eq!(response.text().unwrap(), "ok");
    assert_eq!(response.effective_uri().unwrap().to_string(), m2.url());

    assert_eq!(m1.requests_received(), 1);
    assert_eq!(m2.requests_received(), 1);
}