use super::*;
use crate::cache::RangeSelection;
use http::HeaderValue;

fn settings() -> Settings {
    Settings {
        enabled: true,
        static_ignore_cookies: true,
        static_extensions: vec!["css".into()],
        ..Default::default()
    }
}

#[test]
fn disabled_cache_retains_reason_without_matching_force_rules_or_reparsing_headers() {
    let settings = settings();
    let mut headers = HeaderMap::new();
    headers.insert("authorization", HeaderValue::from_static("private"));
    headers.insert(
        "cache-control",
        HeaderValue::from_static("max-age=not-a-number"),
    );
    for reason in [
        "cache_disabled",
        "route_disabled",
        "admin_control_plane",
        "basic_auth",
        "tinyauth",
        "authelia",
        "authentik",
        "sticky_cookie",
        "request_upgrade",
    ] {
        let plan = CachePlan::new(Some(reason), &settings, "/style.css", || {
            panic!("disabled cache must not match force-cache rules")
        });
        assert!(!plan.force_cache());
        assert!(!plan.ignore_cookie());
        let policy =
            plan.request_policy(&Method::GET, &headers, true, "/style.css", false, &settings);
        assert_eq!(policy, RequestPolicy::Bypass(reason));
        assert_eq!(
            combine_policy(policy, || panic!(
                "disabled cache must not parse post-rule policy"
            )),
            policy
        );
    }
}

#[test]
fn cache_on_keeps_all_existing_request_policy_outcomes() {
    let settings = settings();
    for forced in [false, true] {
        let plan = CachePlan::new(None, &settings, "/style.css", || forced);
        for (name, value) in [
            ("x-irrelevant", "yes"),
            ("cache-control", "no-store"),
            ("cache-control", "no-cache"),
            ("cache-control", "max-age=0"),
            ("cache-control", "min-fresh=broken"),
            ("authorization", "private"),
            ("cookie", "session=private"),
            ("range", "bytes=0-2"),
            ("range", "bytes=0-2,4-5"),
            ("if-range", "\"etag\""),
            ("if-match", "\"etag\""),
            ("upgrade", "websocket"),
        ] {
            let mut headers = HeaderMap::new();
            headers.insert(
                http::HeaderName::from_bytes(name.as_bytes()).unwrap(),
                value.parse().unwrap(),
            );
            for method in [Method::GET, Method::HEAD, Method::POST] {
                for body_empty in [false, true] {
                    let expected = if forced {
                        crate::cache::forced_request_policy(&method, &headers, body_empty)
                    } else {
                        crate::cache::request_policy(
                            &method,
                            &headers,
                            body_empty,
                            "/style.css",
                            false,
                            &settings,
                        )
                    };
                    assert_eq!(
                        plan.request_policy(
                            &method,
                            &headers,
                            body_empty,
                            "/style.css",
                            false,
                            &settings
                        ),
                        expected
                    );
                }
            }
        }
    }
}

#[test]
fn request_header_rules_cannot_relax_bypass_or_revalidation() {
    let cases = [
        RequestPolicy::Use,
        RequestPolicy::Revalidate("request_no_cache"),
        RequestPolicy::Revalidate("request_max_age"),
        RequestPolicy::Bypass("request_authorization"),
        RequestPolicy::Bypass("request_no_store"),
    ];
    for original in cases {
        for rewritten in cases {
            let expected = match (original, rewritten) {
                (RequestPolicy::Bypass(reason), _) | (_, RequestPolicy::Bypass(reason)) => {
                    RequestPolicy::Bypass(reason)
                }
                (RequestPolicy::Revalidate(reason), _) | (_, RequestPolicy::Revalidate(reason)) => {
                    RequestPolicy::Revalidate(reason)
                }
                _ => RequestPolicy::Use,
            };
            assert_eq!(combine_policy(original, || rewritten), expected);
        }
    }
}

#[test]
fn cache_off_still_blocks_range_transformation_and_preserves_origin_headers() {
    for method in [Method::GET, Method::HEAD, Method::POST] {
        for range in [
            None,
            Some("bytes=0-2"),
            Some("bytes=0-2,4-5"),
            Some("broken"),
            Some("bytes=99-"),
        ] {
            let mut headers = HeaderMap::new();
            if let Some(range) = range {
                headers.insert("range", range.parse().unwrap());
            }
            headers.insert("if-range", HeaderValue::from_static("\"same-validator\""));
            headers.insert(
                "if-none-match",
                HeaderValue::from_static("\"client-validator\""),
            );
            let original = headers.clone();
            let baseline = crate::cache::request_range(&method, &headers);
            assert_eq!(range_selection(true, &method, &headers), baseline);
            assert_eq!(
                matches!(
                    range_selection(false, &method, &headers),
                    RangeSelection::None
                ),
                matches!(baseline, RangeSelection::None)
            );
            assert_eq!(
                headers, original,
                "origin must receive the original Range/conditional fields"
            );
        }
    }
}

#[test]
fn force_cache_keeps_cookie_variants_and_disabled_cookie_matching_has_no_effect() {
    let settings = settings();
    let ordinary = CachePlan::new(None, &settings, "/style.css", || false);
    assert!(ordinary.ignore_cookie());
    let forced = CachePlan::new(None, &settings, "/style.css", || true);
    assert!(forced.force_cache());
    assert!(!forced.ignore_cookie());
    let disabled = CachePlan::new(Some("route_disabled"), &settings, "/style.css", || true);
    assert!(!disabled.force_cache());
    assert!(!disabled.ignore_cookie());
}