use std::path::Path;

use sha2::Digest;

use rpki::data_model::manifest::ManifestObject;
use rpki::policy::{CaFailedFetchPolicy, Policy};
use rpki::storage::{
    PackTime, RawByHashEntry, RocksStore, ValidatedCaInstanceResult, ValidatedManifestMeta,
    VcirArtifactKind, VcirArtifactRole, VcirArtifactValidationStatus, VcirAuditSummary,
    VcirInstanceGate, VcirRelatedArtifact, VcirSummary,
};
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
}

fn store_validated_manifest_baseline(
    store: &RocksStore,
    manifest_rsync_uri: &str,
    manifest_bytes: &[u8],
    manifest_number_be: Vec<u8>,
    this_update: time::OffsetDateTime,
    next_update: time::OffsetDateTime,
) {
    let manifest_sha256 = hex::encode(sha2::Sha256::digest(manifest_bytes));
    let mut manifest_raw =
        RawByHashEntry::from_bytes(manifest_sha256.clone(), manifest_bytes.to_vec());
    manifest_raw
        .origin_uris
        .push(manifest_rsync_uri.to_string());
    manifest_raw.object_type = Some("mft".to_string());
    manifest_raw.encoding = Some("der".to_string());
    store
        .put_raw_by_hash_entry(&manifest_raw)
        .expect("store VCIR manifest raw_by_hash");

    let vcir = ValidatedCaInstanceResult {
        manifest_rsync_uri: manifest_rsync_uri.to_string(),
        parent_manifest_rsync_uri: None,
        tal_id: "test-tal".to_string(),
        ca_subject_name: "CN=test".to_string(),
        ca_ski: "aa".to_string(),
        issuer_ski: "aa".to_string(),
        last_successful_validation_time: PackTime::from_utc_offset_datetime(this_update),
        current_manifest_rsync_uri: manifest_rsync_uri.to_string(),
        current_crl_rsync_uri: format!("{manifest_rsync_uri}.crl"),
        validated_manifest_meta: ValidatedManifestMeta {
            validated_manifest_number: manifest_number_be,
            validated_manifest_this_update: PackTime::from_utc_offset_datetime(this_update),
            validated_manifest_next_update: PackTime::from_utc_offset_datetime(next_update),
        },
        instance_gate: VcirInstanceGate {
            manifest_next_update: PackTime::from_utc_offset_datetime(next_update),
            current_crl_next_update: PackTime::from_utc_offset_datetime(next_update),
            self_ca_not_after: PackTime::from_utc_offset_datetime(next_update),
            instance_effective_until: PackTime::from_utc_offset_datetime(next_update),
        },
        child_entries: Vec::new(),
        local_outputs: Vec::new(),
        related_artifacts: vec![VcirRelatedArtifact {
            artifact_role: VcirArtifactRole::Manifest,
            artifact_kind: VcirArtifactKind::Mft,
            uri: Some(manifest_rsync_uri.to_string()),
            sha256: manifest_sha256,
            object_type: Some("mft".to_string()),
            validation_status: VcirArtifactValidationStatus::Accepted,
        }],
        summary: VcirSummary {
            local_vrp_count: 0,
            local_aspa_count: 0,
            child_count: 0,
            accepted_object_count: 1,
            rejected_object_count: 0,
        },
        audit_summary: VcirAuditSummary {
            failed_fetch_eligible: true,
            last_failed_fetch_reason: None,
            warning_count: 0,
            audit_flags: Vec::new(),
        },
    };
    store
        .put_vcir(&vcir)
        .expect("store validated manifest baseline");
}

#[test]
fn manifest_success_returns_validated_publication_point_data() {
    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");
    let entries = manifest
        .manifest
        .parse_files()
        .expect("parse validated manifest fileList");
    for entry in &entries {
        let file_path = manifest_path
            .parent()
            .unwrap()
            .join(entry.file_name.as_str());
        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());

    assert_eq!(out.snapshot.manifest_rsync_uri, manifest_rsync_uri);
    assert_eq!(
        out.snapshot.publication_point_rsync_uri,
        publication_point_rsync_uri
    );
}

#[test]
fn manifest_hash_mismatch_reuses_current_instance_vcir_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");
    let entries = manifest
        .manifest
        .parse_files()
        .expect("parse validated manifest fileList");
    for entry in &entries {
        let file_path = manifest_path
            .parent()
            .unwrap()
            .join(entry.file_name.as_str());
        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 returns validated publication point");
    assert_eq!(first.source, PublicationPointSource::Fresh);

    store_validated_manifest_baseline(
        &store,
        &manifest_rsync_uri,
        &manifest_bytes,
        manifest.manifest.manifest_number.bytes_be.clone(),
        manifest.manifest.this_update,
        manifest.manifest.next_update,
    );

    let entries = manifest
        .manifest
        .parse_files()
        .expect("parse validated manifest fileList");
    let victim = entries.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 reuses current-instance VCIR");
    assert_eq!(second.source, PublicationPointSource::VcirCurrentInstance);
    assert!(
        second.warnings.iter().any(|w| w
            .message
            .contains("using latest validated result for current CA instance")),
        "expected current-instance VCIR reuse warning"
    );
}

#[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");
    let entries = manifest
        .manifest
        .parse_files()
        .expect("parse validated manifest fileList");
    for entry in &entries {
        let file_path = manifest_path
            .parent()
            .unwrap()
            .join(entry.file_name.as_str());
        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::ReuseCurrentInstanceVcir;
    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 returns validated publication point");

    let entries = manifest
        .manifest
        .parse_files()
        .expect("parse validated manifest fileList");
    let victim = entries.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 reuse current-instance VCIR");
    let msg = err.to_string();
    assert!(msg.contains("cache use is disabled"));
}

#[test]
fn manifest_failed_fetch_rejects_stale_current_instance_vcir() {
    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");
    let entries = manifest
        .manifest
        .parse_files()
        .expect("parse validated manifest fileList");
    for entry in &entries {
        let file_path = manifest_path
            .parent()
            .unwrap()
            .join(entry.file_name.as_str());
        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 returns validated publication point");

    store_validated_manifest_baseline(
        &store,
        &manifest_rsync_uri,
        &manifest_bytes,
        manifest.manifest.manifest_number.bytes_be.clone(),
        manifest.manifest.this_update,
        manifest.manifest.next_update,
    );

    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 current-instance VCIR reuse");
    let msg = err.to_string();
    assert!(msg.contains("instance_gate expired"), "{msg}");
}

#[test]
fn manifest_revalidation_with_unchanged_manifest_is_fresh() {
    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");
    let entries = manifest
        .manifest
        .parse_files()
        .expect("parse validated manifest fileList");
    for entry in &entries {
        let file_path = manifest_path
            .parent()
            .unwrap()
            .join(entry.file_name.as_str());
        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 returns validated publication point");
    assert_eq!(first.source, PublicationPointSource::Fresh);

    store_validated_manifest_baseline(
        &store,
        &manifest_rsync_uri,
        &manifest_bytes,
        first.snapshot.manifest_number_be.clone(),
        manifest.manifest.this_update,
        manifest.manifest.next_update,
    );

    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 accept revalidation of the same manifest");
    assert_eq!(second.source, PublicationPointSource::Fresh);
    assert!(second.warnings.is_empty());
    assert_eq!(
        second.snapshot.manifest_bytes,
        first.snapshot.manifest_bytes
    );
    assert_eq!(
        second.snapshot.manifest_number_be,
        first.snapshot.manifest_number_be
    );
    assert_eq!(second.snapshot.files, first.snapshot.files);
}

#[test]
fn manifest_rollback_is_treated_as_failed_fetch_and_reuses_current_instance_vcir() {
    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");
    let entries = manifest
        .manifest
        .parse_files()
        .expect("parse validated manifest fileList");
    for entry in &entries {
        let file_path = manifest_path
            .parent()
            .unwrap()
            .join(entry.file_name.as_str());
        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 returns validated publication point");
    assert_eq!(first.source, PublicationPointSource::Fresh);

    // Simulate a previously validated manifest with a higher manifestNumber (rollback detection).
    let mut bumped = first.snapshot.clone();
    // Deterministically bump the cached manifestNumber to be strictly greater than the current one.
    for i in (0..bumped.manifest_number_be.len()).rev() {
        let (v, carry) = bumped.manifest_number_be[i].overflowing_add(1);
        bumped.manifest_number_be[i] = v;
        if !carry {
            break;
        }
        if i == 0 {
            bumped.manifest_number_be.insert(0, 1);
            break;
        }
    }
    store_validated_manifest_baseline(
        &store,
        &manifest_rsync_uri,
        &manifest_bytes,
        bumped.manifest_number_be.clone(),
        manifest.manifest.this_update,
        manifest.manifest.next_update,
    );

    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 rollback as failed fetch and reuse current-instance VCIR");
    assert_eq!(second.source, PublicationPointSource::VcirCurrentInstance);
    assert!(
        second
            .warnings
            .iter()
            .any(|w| w.message.contains("manifestNumber not higher")),
        "expected warning mentioning manifestNumber monotonicity"
    );
}