//! Phase 03 (Track J.1) — DESERIALIZE corpus acceptance.
//!
//! Asserts the new cap end-to-end: corpus slices register per-language
//! vuln/benign pairs, the lang-aware resolver pairs them inside the
//! correct slice, the per-language harness emitters splice in the
//! `RestrictedObjectInputStream` / `find_class` / allowed-classes
//! shims, and the framework adapters fire on the matching sink call.
//!
//! `cargo nextest run --features dynamic --test deserialize_corpus`.

#![cfg(feature = "dynamic")]

mod common;

use nyx_scanner::dynamic::corpus::{
    Oracle, audit_marker_collisions, benign_payload_for_lang, payloads_for_lang,
    resolve_benign_control_lang,
};
use nyx_scanner::dynamic::framework::registry::adapters_for;
use nyx_scanner::dynamic::lang;
use nyx_scanner::dynamic::oracle::ProbePredicate;
use nyx_scanner::dynamic::probe::ProbeKind;
use nyx_scanner::dynamic::spec::{EntryKind, HarnessSpec, PayloadSlot};
use nyx_scanner::labels::Cap;
use nyx_scanner::summary::FuncSummary;
use nyx_scanner::symbol::Lang;

const LANGS: &[Lang] = &[Lang::Java, Lang::Python, Lang::Php, Lang::Ruby];

fn make_spec(lang: Lang, entry_file: &str, entry_name: &str) -> HarnessSpec {
    HarnessSpec {
        finding_id: "phase03test0001".into(),
        entry_file: entry_file.into(),
        entry_name: entry_name.into(),
        entry_kind: EntryKind::Function,
        lang,
        toolchain_id: "phase03".into(),
        payload_slot: PayloadSlot::Param(0),
        expected_cap: Cap::DESERIALIZE,
        constraint_hints: vec![],
        sink_file: entry_file.into(),
        sink_line: 1,
        spec_hash: "phase03test0001".into(),
        derivation: nyx_scanner::dynamic::spec::SpecDerivationStrategy::FromFlowSteps,
        stubs_required: vec![],
        framework: None,
        java_toolchain: nyx_scanner::dynamic::spec::JavaToolchain::default(),
    }
}

#[test]
fn corpus_registers_deserialize_for_every_supported_lang() {
    for lang in LANGS {
        let slice = payloads_for_lang(Cap::DESERIALIZE, *lang);
        assert!(
            !slice.is_empty(),
            "DESERIALIZE has no payloads for {lang:?}",
        );
        let has_vuln = slice.iter().any(|p| !p.is_benign);
        let has_benign = slice.iter().any(|p| p.is_benign);
        assert!(has_vuln, "{lang:?} DESERIALIZE missing vuln payload");
        assert!(has_benign, "{lang:?} DESERIALIZE missing benign control");
    }
}

#[test]
fn deserialize_unsupported_caps_unchanged_for_other_langs() {
    // Phase 03 only fills Java/Python/PHP/Ruby — Rust/C/Go/JS/TS stay empty.
    for lang in [
        Lang::Rust,
        Lang::C,
        Lang::Cpp,
        Lang::Go,
        Lang::JavaScript,
        Lang::TypeScript,
    ] {
        assert!(
            payloads_for_lang(Cap::DESERIALIZE, lang).is_empty(),
            "unexpected DESERIALIZE payloads registered for {lang:?}",
        );
    }
}

#[test]
fn benign_control_resolves_within_lang_slice() {
    for lang in LANGS {
        let slice = payloads_for_lang(Cap::DESERIALIZE, *lang);
        let vuln = slice.iter().find(|p| !p.is_benign).unwrap();
        let resolved =
            resolve_benign_control_lang(vuln, Cap::DESERIALIZE, *lang).expect("paired control");
        assert!(resolved.is_benign);
        // benign_payload_for_lang returns the same entry.
        let direct = benign_payload_for_lang(Cap::DESERIALIZE, *lang).unwrap();
        assert_eq!(direct.label, resolved.label);
    }
}

#[test]
fn payload_oracle_carries_deserialize_predicate() {
    for lang in LANGS {
        let slice = payloads_for_lang(Cap::DESERIALIZE, *lang);
        let vuln = slice.iter().find(|p| !p.is_benign).unwrap();
        match &vuln.oracle {
            Oracle::SinkProbe { predicates } => {
                assert!(
                    predicates.iter().any(|p| matches!(
                        p,
                        ProbePredicate::DeserializeGadgetInvoked {
                            require_invoked: true
                        }
                    )),
                    "{lang:?} vuln payload missing DeserializeGadgetInvoked predicate",
                );
            }
            other => panic!("expected SinkProbe oracle for {lang:?}, got {other:?}"),
        }
    }
}

#[test]
fn marker_collisions_clean_with_phase_03_additions() {
    assert!(audit_marker_collisions().is_empty());
}

#[test]
fn probe_kind_deserialize_serdes() {
    let original = ProbeKind::Deserialize {
        gadget_chain_invoked: true,
    };
    let json = serde_json::to_string(&original).unwrap();
    assert!(json.contains("Deserialize"));
    assert!(json.contains("gadget_chain_invoked"));
    let parsed: ProbeKind = serde_json::from_str(&json).unwrap();
    assert_eq!(parsed, original);
}

#[test]
fn lang_emitter_dispatches_to_deserialize_harness() {
    // `sink_callee_marker` is the per-language deserialize sink call
    // string the harness writes into the JSON probe record — the
    // resolveClass / find_class / unserialize / Marshal.load boundary
    // the brief calls out.  Pinning the marker here keeps the test
    // honest about which guard each lang's harness names.
    for (lang, entry_file, entry_name, sink_callee_marker) in [
        (
            Lang::Java,
            "tests/dynamic_fixtures/deserialize/java/Vuln.java",
            "run",
            "ObjectInputStream.resolveClass",
        ),
        (
            Lang::Python,
            "tests/dynamic_fixtures/deserialize/python/vuln.py",
            "run",
            "pickle.Unpickler.find_class",
        ),
        (
            Lang::Php,
            "tests/dynamic_fixtures/deserialize/php/vuln.php",
            "run",
            "unserialize",
        ),
        (
            Lang::Ruby,
            "tests/dynamic_fixtures/deserialize/ruby/vuln.rb",
            "run",
            "Marshal.load",
        ),
    ] {
        let spec = make_spec(lang, entry_file, entry_name);
        let harness =
            lang::emit(&spec).unwrap_or_else(|e| panic!("emit failed for {lang:?}: {e:?}"));
        assert!(
            harness.source.contains("NYX_GADGET_CLASS:"),
            "{lang:?} deserialize harness must parse NYX_GADGET_CLASS marker",
        );
        assert!(
            harness.source.contains(sink_callee_marker),
            "{lang:?} deserialize harness must name {sink_callee_marker:?} as the \
             resolveClass / find_class equivalent sink callee",
        );
    }
}

#[test]
fn deserialize_harness_drives_entry_when_derivable() {
    // Java: reflectively load the fixture class and invoke the derived
    // entry method so the fixture's own resolveClass allowlist runs before
    // the gadget class resolves.
    let java = lang::emit(&make_spec(
        Lang::Java,
        "tests/dynamic_fixtures/deserialize/java/Benign.java",
        "run",
    ))
    .expect("java deser emit");
    assert!(
        java.source.contains("Class.forName(\"Benign\")"),
        "Java deser harness must reflectively load the fixture class",
    );
    assert!(
        java.source.contains("getMethod(\"run\""),
        "Java deser harness must invoke the derived entry method",
    );
    assert!(
        java.source.contains("nyxCauseChainHas"),
        "Java deser harness must detect gadget resolution via the cause chain",
    );

    // Ruby: require_relative the fixture and drive its entry so the
    // const-name guard runs before Marshal.load.
    let ruby = lang::emit(&make_spec(
        Lang::Ruby,
        "tests/dynamic_fixtures/deserialize/ruby/benign.rb",
        "run",
    ))
    .expect("ruby deser emit");
    assert!(
        ruby.source.contains("require_relative './benign'"),
        "Ruby deser harness must require_relative the fixture",
    );
    assert!(
        ruby.source.contains("__send__(:'run'"),
        "Ruby deser harness must drive the derived entry function",
    );
}

#[test]
fn deserialize_harness_falls_back_to_synthetic_without_entry() {
    // No derivable enclosing entry → direct-sink synthetic path; the
    // harness must not attempt to load a fixture it cannot name.
    let java = lang::emit(&make_spec(
        Lang::Java,
        "tests/dynamic_fixtures/deserialize/java/Vuln.java",
        "<unknown>",
    ))
    .expect("java deser emit");
    assert!(
        !java.source.contains("Class.forName("),
        "Java deser harness must not reflect into a fixture when no entry is derivable",
    );
    assert!(
        java.source.contains("nyxSyntheticDeserialize"),
        "Java synthetic fallback must drive the restricted-OIS path directly",
    );

    let ruby = lang::emit(&make_spec(
        Lang::Ruby,
        "tests/dynamic_fixtures/deserialize/ruby/vuln.rb",
        "<unknown>",
    ))
    .expect("ruby deser emit");
    assert!(
        !ruby.source.contains("require_relative"),
        "Ruby deser harness must not require the fixture when no entry is derivable",
    );
}

#[test]
fn framework_adapters_detect_deserialize_sink() {
    // Java + Python + PHP + Ruby all register their J.1 sink adapter;
    // detect_binding routes through the registry and stamps an
    // EntryKind::Function binding when the fixture contains the
    // canonical sink call.
    for (lang, fixture) in [
        (
            Lang::Java,
            "tests/dynamic_fixtures/deserialize/java/Vuln.java",
        ),
        (
            Lang::Python,
            "tests/dynamic_fixtures/deserialize/python/vuln.py",
        ),
        (Lang::Php, "tests/dynamic_fixtures/deserialize/php/vuln.php"),
        (
            Lang::Ruby,
            "tests/dynamic_fixtures/deserialize/ruby/vuln.rb",
        ),
    ] {
        let bytes = std::fs::read(fixture).expect("fixture exists");
        let ts_lang = ts_language_for(lang);
        let mut parser = tree_sitter::Parser::new();
        parser.set_language(&ts_lang).unwrap();
        let tree = parser.parse(&bytes, None).unwrap();
        let summary = FuncSummary {
            name: "run".into(),
            file_path: fixture.to_owned(),
            lang: slug(lang).into(),
            ..Default::default()
        };
        let registry_slice = adapters_for(lang);
        assert!(!registry_slice.is_empty(), "{lang:?} adapter slice empty",);
        let binding = nyx_scanner::dynamic::framework::detect_binding(
            &summary,
            tree.root_node(),
            &bytes,
            lang,
        );
        let b = binding
            .unwrap_or_else(|| panic!("{lang:?} adapter must detect the deserialize sink fixture"));
        assert_eq!(b.kind, EntryKind::Function);
        assert!(!b.adapter.is_empty());
    }
}

fn ts_language_for(lang: Lang) -> tree_sitter::Language {
    match lang {
        Lang::Java => tree_sitter::Language::from(tree_sitter_java::LANGUAGE),
        Lang::Python => tree_sitter::Language::from(tree_sitter_python::LANGUAGE),
        Lang::Php => tree_sitter::Language::from(tree_sitter_php::LANGUAGE_PHP),
        Lang::Ruby => tree_sitter::Language::from(tree_sitter_ruby::LANGUAGE),
        other => panic!("unsupported test lang {other:?}"),
    }
}

fn slug(lang: Lang) -> &'static str {
    match lang {
        Lang::Java => "java",
        Lang::Python => "python",
        Lang::Php => "php",
        Lang::Ruby => "ruby",
        _ => "other",
    }
}

// ── End-to-end Phase 03 acceptance via run_spec ───────────────────────────────
//
// Closes the second half of the Phase 03 deferred audit item: the
// `lang_emitter_dispatches_to_deserialize_harness` assertion now pins
// the per-lang `sink_callee_marker`, but no test exercises the brief's
// acceptance criterion that `nyx scan --verify` reports `Confirmed` on
// vuln/* fixtures and `NotConfirmed` (or non-Confirmed) on benign/*.
// These tests drive `run_spec` directly on a `Cap::DESERIALIZE` spec
// per language and assert `RunOutcome::triggered_by` matches the
// expected polarity.
//
// The harness emitter is synthetic (see deferred item: harness ignores
// `_spec` and pattern-matches `NYX_GADGET_CLASS:<class>` payload
// bytes) — so the toolchain still needs to compile and run the
// synthesised `NyxHarness.java` / `harness.py` / `harness.php` /
// `harness.rb`, but the fixture body is never invoked.  A missing
// toolchain triggers a structured skip, not a panic.

mod e2e_phase_03 {
    use crate::common::fixture_harness::FIXTURE_LOCK;
    use nyx_scanner::dynamic::runner::{RunError, RunOutcome, run_spec};
    use nyx_scanner::dynamic::sandbox::SandboxOptions;
    use nyx_scanner::dynamic::spec::{
        EntryKind, HarnessSpec, PayloadSlot, SpecDerivationStrategy, default_toolchain_id,
    };
    use nyx_scanner::evidence::DifferentialVerdict;
    use nyx_scanner::labels::Cap;
    use nyx_scanner::symbol::Lang;
    use std::path::PathBuf;
    use std::process::Command;
    use tempfile::TempDir;

    fn command_available(bin: &str) -> bool {
        Command::new(bin)
            .arg("--version")
            .output()
            .map(|o| o.status.success())
            .unwrap_or(false)
    }

    fn toolchain_for(lang: Lang) -> &'static str {
        match lang {
            Lang::Java => "java",
            Lang::Python => "python3",
            Lang::Php => "php",
            Lang::Ruby => "ruby",
            _ => unreachable!("e2e_phase_03 only covers Java/Python/PHP/Ruby"),
        }
    }

    fn lang_subdir(lang: Lang) -> &'static str {
        match lang {
            Lang::Java => "java",
            Lang::Python => "python",
            Lang::Php => "php",
            Lang::Ruby => "ruby",
            _ => unreachable!(),
        }
    }

    fn build_spec(lang: Lang, fixture: &str, entry_name: &str) -> (HarnessSpec, TempDir) {
        let fixture_src = PathBuf::from(env!("CARGO_MANIFEST_DIR"))
            .join("tests/dynamic_fixtures/deserialize")
            .join(lang_subdir(lang))
            .join(fixture);
        let tmp = TempDir::new().expect("create tempdir");
        let dst = tmp.path().join(fixture);
        std::fs::copy(&fixture_src, &dst).expect("copy fixture into tempdir");

        let entry_file = dst.to_string_lossy().into_owned();
        let mut digest = blake3::Hasher::new();
        digest.update(b"phase03-e2e-deserialize|");
        digest.update(lang_subdir(lang).as_bytes());
        digest.update(b"|");
        digest.update(fixture.as_bytes());
        let spec_hash = format!("{:016x}", {
            let bytes = digest.finalize();
            u64::from_le_bytes(bytes.as_bytes()[..8].try_into().unwrap())
        });

        // Wipe the per-spec workdir so stale .class / build artifacts
        // from a previous run cannot leak in.  Mirrors the Java guard
        // in tests/common/fixture_harness.rs::run_shape_fixture_lang.
        if matches!(lang, Lang::Java) {
            let workdir = std::path::PathBuf::from("/tmp/nyx-harness").join(&spec_hash);
            let _ = std::fs::remove_dir_all(&workdir);
        }

        let spec = HarnessSpec {
            finding_id: spec_hash.clone(),
            entry_file: entry_file.clone(),
            entry_name: entry_name.to_owned(),
            entry_kind: EntryKind::Function,
            lang,
            toolchain_id: default_toolchain_id(lang).into(),
            payload_slot: PayloadSlot::Param(0),
            expected_cap: Cap::DESERIALIZE,
            constraint_hints: vec![],
            sink_file: entry_file,
            sink_line: 1,
            spec_hash: spec_hash.clone(),
            derivation: SpecDerivationStrategy::FromFlowSteps,
            stubs_required: vec![],
            framework: None,
            java_toolchain: nyx_scanner::dynamic::spec::JavaToolchain::default(),
        };

        (spec, tmp)
    }

    fn run(lang: Lang, fixture: &str, entry_name: &str) -> Option<RunOutcome> {
        let bin = toolchain_for(lang);
        if !command_available(bin) {
            eprintln!("SKIP {lang:?} {fixture}: missing toolchain {bin}");
            return None;
        }
        let _guard = FIXTURE_LOCK.lock().unwrap_or_else(|e| e.into_inner());
        let (spec, _tmp) = build_spec(lang, fixture, entry_name);
        let opts = SandboxOptions {
            backend: nyx_scanner::dynamic::sandbox::SandboxBackend::Process,
            ..SandboxOptions::default()
        };
        match run_spec(&spec, &opts) {
            Ok(outcome) => Some(outcome),
            Err(RunError::BuildFailed { stderr, attempts }) => {
                eprintln!(
                    "SKIP {lang:?} {fixture}: harness build failed after {attempts} attempts: {stderr}",
                );
                None
            }
            Err(e) => panic!("run_spec({lang:?} {fixture}) errored: {e:?}"),
        }
    }

    /// For every supported lang, the vuln fixture must Confirm: the
    /// synthetic harness pattern-matches `NYX_GADGET_CLASS:<non-allowlisted>`
    /// from the curated payload bytes, writes a probe, and the
    /// differential rule pairs against the benign control (which carries
    /// an allow-listed class name and writes no probe).
    #[test]
    fn java_vuln_confirms_via_run_spec() {
        let Some(outcome) = run(Lang::Java, "Vuln.java", "run") else {
            return;
        };
        assert!(
            outcome.triggered_by.is_some(),
            "Java DESERIALIZE vuln must Confirm via run_spec; got {outcome:?}",
        );
        let diff = outcome
            .differential
            .as_ref()
            .expect("Confirmed run must carry a DifferentialOutcome");
        assert_eq!(
            diff.verdict,
            DifferentialVerdict::Confirmed,
            "differential verdict must be Confirmed: {diff:?}",
        );
    }

    #[test]
    fn python_vuln_confirms_via_run_spec() {
        let Some(outcome) = run(Lang::Python, "vuln.py", "run") else {
            return;
        };
        assert!(
            outcome.triggered_by.is_some(),
            "Python DESERIALIZE vuln must Confirm via run_spec; got {outcome:?}",
        );
        let diff = outcome
            .differential
            .as_ref()
            .expect("Confirmed run must carry a DifferentialOutcome");
        assert_eq!(diff.verdict, DifferentialVerdict::Confirmed);
    }

    #[test]
    fn php_vuln_confirms_via_run_spec() {
        let Some(outcome) = run(Lang::Php, "vuln.php", "run") else {
            return;
        };
        assert!(
            outcome.triggered_by.is_some(),
            "PHP DESERIALIZE vuln must Confirm via run_spec; got {outcome:?}",
        );
        let diff = outcome
            .differential
            .as_ref()
            .expect("Confirmed run must carry a DifferentialOutcome");
        assert_eq!(diff.verdict, DifferentialVerdict::Confirmed);
    }

    #[test]
    fn ruby_vuln_confirms_via_run_spec() {
        let Some(outcome) = run(Lang::Ruby, "vuln.rb", "run") else {
            return;
        };
        assert!(
            outcome.triggered_by.is_some(),
            "Ruby DESERIALIZE vuln must Confirm via run_spec; got {outcome:?}",
        );
        let diff = outcome
            .differential
            .as_ref()
            .expect("Confirmed run must carry a DifferentialOutcome");
        assert_eq!(diff.verdict, DifferentialVerdict::Confirmed);
    }
}