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::{PublicationPointSource, 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 manifest_success_writes_fetch_cache_pp_pack() {
    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 out = process_manifest_publication_point(
        &store,
        &policy,
        &manifest_rsync_uri,
        &publication_point_rsync_uri,
        &issuer_ca_der,
        Some(issuer_ca_rsync_uri()),
        validation_time,
    )
    .expect("process manifest publication point");
    assert_eq!(out.source, PublicationPointSource::Fresh);
    assert!(out.warnings.is_empty());

    let key = FetchCachePpKey::from_manifest_rsync_uri(&manifest_rsync_uri);
    let stored = store
        .get_fetch_cache_pp(&key)
        .expect("get fetch_cache_pp")
        .expect("fetch_cache_pp pack exists");
    let decoded = FetchCachePpPack::decode(&stored).expect("decode stored pack");
    assert_eq!(decoded.manifest_rsync_uri, manifest_rsync_uri);
    assert_eq!(
        decoded.publication_point_rsync_uri,
        publication_point_rsync_uri
    );
}

#[test]
fn manifest_hash_mismatch_falls_back_to_fetch_cache_pp_when_enabled() {
    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 first = 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");
    assert_eq!(first.source, PublicationPointSource::Fresh);

    let key = FetchCachePpKey::from_manifest_rsync_uri(&manifest_rsync_uri);
    let cached_bytes = store
        .get_fetch_cache_pp(&key)
        .expect("get fetch_cache_pp")
        .expect("fetch_cache_pp pack exists");
    let cached_pack = FetchCachePpPack::decode(&cached_bytes).expect("decode cached");

    let victim = manifest
        .manifest
        .files
        .first()
        .expect("non-empty file list");
    let victim_uri = format!("{publication_point_rsync_uri}{}", victim.file_name);
    let mut tampered = store
        .get_raw(&victim_uri)
        .expect("get victim raw")
        .expect("victim raw exists");
    tampered[0] ^= 0xFF;
    store.put_raw(&victim_uri, &tampered).expect("tamper raw");

    let second = process_manifest_publication_point(
        &store,
        &policy,
        &manifest_rsync_uri,
        &publication_point_rsync_uri,
        &issuer_ca_der,
        Some(issuer_ca_rsync_uri()),
        validation_time,
    )
    .expect("second run falls back to fetch_cache_pp");
    assert_eq!(second.source, PublicationPointSource::FetchCachePp);
    assert!(!second.warnings.is_empty());
    assert_eq!(second.pack, cached_pack);
}

#[test]
fn manifest_failed_fetch_stop_all_output() {
    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 mut policy = Policy::default();
    policy.ca_failed_fetch_policy = CaFailedFetchPolicy::UseFetchCachePp;
    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");

    let victim = manifest
        .manifest
        .files
        .first()
        .expect("non-empty file list");
    let victim_uri = format!("{publication_point_rsync_uri}{}", victim.file_name);
    let mut tampered = store
        .get_raw(&victim_uri)
        .expect("get victim raw")
        .expect("victim raw exists");
    tampered[0] ^= 0xFF;
    store.put_raw(&victim_uri, &tampered).expect("tamper raw");

    policy.ca_failed_fetch_policy = CaFailedFetchPolicy::StopAllOutput;
    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("stop_all_output should not use fetch_cache_pp");
    let msg = err.to_string();
    assert!(msg.contains("cache use is disabled"));
}

#[test]
fn manifest_fallback_pack_is_revalidated_and_rejected_if_stale() {
    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 ok_time = manifest.manifest.this_update + time::Duration::seconds(1);
    let stale_time = manifest.manifest.next_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()),
        ok_time,
    )
    .expect("first run stores fetch_cache_pp pack");

    store
        .delete_raw(&manifest_rsync_uri)
        .expect("delete manifest raw to force fallback");

    let err = process_manifest_publication_point(
        &store,
        &policy,
        &manifest_rsync_uri,
        &publication_point_rsync_uri,
        &issuer_ca_der,
        Some(issuer_ca_rsync_uri()),
        stale_time,
    )
    .expect_err("stale validation_time must reject fetch_cache_pp pack");
    let msg = err.to_string();
    assert!(msg.contains("not valid at validation_time"));
}

#[test]
fn manifest_replay_is_treated_as_failed_fetch_and_uses_fetch_cache_pp() {
    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 t1 = manifest.manifest.this_update + time::Duration::seconds(1);
    let t2 = manifest.manifest.this_update + time::Duration::seconds(2);

    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 first = process_manifest_publication_point(
        &store,
        &policy,
        &manifest_rsync_uri,
        &publication_point_rsync_uri,
        &issuer_ca_der,
        Some(issuer_ca_rsync_uri()),
        t1,
    )
    .expect("first run builds and stores fetch_cache_pp pack");
    assert_eq!(first.source, PublicationPointSource::Fresh);

    let second = process_manifest_publication_point(
        &store,
        &policy,
        &manifest_rsync_uri,
        &publication_point_rsync_uri,
        &issuer_ca_der,
        Some(issuer_ca_rsync_uri()),
        t2,
    )
    .expect("second run should treat replay as failed fetch and use cache");
    assert_eq!(second.source, PublicationPointSource::FetchCachePp);
    assert_eq!(second.pack, first.pack);
    assert!(
        second
            .warnings
            .iter()
            .any(|w| w.message.contains("manifestNumber not higher")),
        "expected warning mentioning manifestNumber monotonicity"
    );
}