use std::path::Path;

use rpki::data_model::manifest::ManifestObject;
use rpki::policy::{CaFailedFetchPolicy, Policy};
use rpki::storage::{FetchCachePpKey, FetchCachePpPack, RocksStore};
use rpki::validation::manifest::process_manifest_publication_point;

fn issuer_ca_fixture() -> Vec<u8> {
    std::fs::read(
        "tests/fixtures/repository/rpki.apnic.net/repository/B527EF581D6611E2BB468F7C72FD1FF2/BfycW4hQb3wNP4YsiJW-1n6fjro.cer",
    )
    .expect("read issuer ca fixture")
}

fn issuer_ca_rsync_uri() -> &'static str {
    "rsync://rpki.apnic.net/repository/B527EF581D6611E2BB468F7C72FD1FF2/BfycW4hQb3wNP4YsiJW-1n6fjro.cer"
}

fn fixture_to_rsync_uri(path: &Path) -> String {
    let rel = path
        .strip_prefix("tests/fixtures/repository")
        .expect("path under tests/fixtures/repository");
    let mut it = rel.components();
    let host = it
        .next()
        .expect("host component")
        .as_os_str()
        .to_string_lossy();
    let rest = it.as_path().to_string_lossy();
    format!("rsync://{host}/{rest}")
}

fn fixture_dir_to_rsync_uri(dir: &Path) -> String {
    let mut s = fixture_to_rsync_uri(dir);
    if !s.ends_with('/') {
        s.push('/');
    }
    s
}

#[test]
fn cache_is_not_used_when_missing_and_fresh_manifest_is_missing() {
    let temp = tempfile::tempdir().expect("tempdir");
    let store = RocksStore::open(temp.path()).expect("open rocksdb");

    let mut policy = Policy::default();
    policy.ca_failed_fetch_policy = CaFailedFetchPolicy::UseFetchCachePp;
    let issuer_ca_der = issuer_ca_fixture();

    let err = process_manifest_publication_point(
        &store,
        &policy,
        "rsync://example.net/repo/manifest.mft",
        "rsync://example.net/repo/",
        &issuer_ca_der,
        Some(issuer_ca_rsync_uri()),
        time::OffsetDateTime::from_unix_timestamp(0).unwrap(),
    )
    .expect_err("no raw and no fetch_cache_pp should fail");

    assert!(err.to_string().contains("fetch_cache_pp entry missing"));
}

#[test]
fn cache_pack_publication_point_mismatch_is_rejected() {
    let manifest_path = Path::new(
        "tests/fixtures/repository/rpki.cernet.net/repo/cernet/0/05FC9C5B88506F7C0D3F862C8895BED67E9F8EBA.mft",
    );
    let manifest_bytes = std::fs::read(manifest_path).expect("read manifest fixture");
    let manifest = ManifestObject::decode_der(&manifest_bytes).expect("decode manifest fixture");

    let validation_time = manifest.manifest.this_update + time::Duration::seconds(1);

    let manifest_rsync_uri = fixture_to_rsync_uri(manifest_path);
    let publication_point_rsync_uri = fixture_dir_to_rsync_uri(manifest_path.parent().unwrap());

    let temp = tempfile::tempdir().expect("tempdir");
    let store = RocksStore::open(temp.path()).expect("open rocksdb");

    store
        .put_raw(&manifest_rsync_uri, &manifest_bytes)
        .expect("store manifest");
    for entry in &manifest.manifest.files {
        let file_path = manifest_path.parent().unwrap().join(&entry.file_name);
        let bytes = std::fs::read(&file_path)
            .unwrap_or_else(|_| panic!("read fixture file referenced by manifest: {file_path:?}"));
        let rsync_uri = format!("{publication_point_rsync_uri}{}", entry.file_name);
        store.put_raw(&rsync_uri, &bytes).expect("store file");
    }

    let policy = Policy::default();
    let issuer_ca_der = issuer_ca_fixture();
    let _ = process_manifest_publication_point(
        &store,
        &policy,
        &manifest_rsync_uri,
        &publication_point_rsync_uri,
        &issuer_ca_der,
        Some(issuer_ca_rsync_uri()),
        validation_time,
    )
    .expect("first run stores fetch_cache_pp pack");

    // Corrupt the cached pack by changing the publication point.
    let key = FetchCachePpKey::from_manifest_rsync_uri(&manifest_rsync_uri);
    let bytes = store
        .get_fetch_cache_pp(&key)
        .expect("get fetch_cache_pp")
        .expect("fetch_cache_pp exists");
    let mut pack = FetchCachePpPack::decode(&bytes).expect("decode pack");
    pack.publication_point_rsync_uri = "rsync://evil.invalid/repo/".to_string();
    let bytes = pack.encode().expect("re-encode pack");
    store
        .put_fetch_cache_pp(&key, &bytes)
        .expect("overwrite fetch_cache_pp");

    // Remove raw manifest to force cache path.
    store
        .delete_raw(&manifest_rsync_uri)
        .expect("delete raw manifest");

    let err = process_manifest_publication_point(
        &store,
        &policy,
        &manifest_rsync_uri,
        &publication_point_rsync_uri,
        &issuer_ca_der,
        Some(issuer_ca_rsync_uri()),
        validation_time,
    )
    .expect_err("cache pack mismatch should fail");

    assert!(
        err.to_string()
            .contains("publication_point_rsync_uri does not match expected")
    );
}