/*!
 * Execution Runner Module - Nyash File and Mode Execution Coordinator
 *
 * This module handles all execution logic, backend selection, and mode coordination,
 * separated from CLI parsing and the main entry point.
 */

use nyash_rust::cli::CliConfig;
// prune heavy unused imports here; modules import what they need locally
// pruned unused runtime imports in this module

#[cfg(feature = "wasm-backend")]
use nyash_rust::backend::{aot::AotBackend, wasm::WasmBackend};

#[cfg(feature = "llvm-inkwell-legacy")]
use nyash_rust::backend::llvm_compile_and_execute;
use std::{fs, process};
mod box_index;
mod build;
mod cli_directives;
mod demos;
mod dispatch;
mod json_v0_bridge;
mod mir_json_emit;
pub mod modes;
mod pipe_io;
mod pipeline;
mod jit_direct;
mod selfhost;
mod tasks;
mod trace;
mod plugins;

// v2 plugin system imports
use nyash_rust::runner_plugin_init;
use nyash_rust::runtime;
// use std::path::PathBuf; // not used in current runner

/// Resolve a using target according to priority: modules > relative > using-paths
/// Returns Ok(resolved_path_or_token). On strict mode, ambiguous matches cause error.
// use pipeline::resolve_using_target; // resolved within helpers; avoid unused warning

/// Main execution coordinator
pub struct NyashRunner {
    config: CliConfig,
}

/// Minimal task runner: read nyash.toml [env] and [tasks], run the named task via shell
use tasks::run_named_task;

#[cfg(not(feature = "jit-direct-only"))]
impl NyashRunner {
    /// Create a new runner with the given configuration
    pub fn new(config: CliConfig) -> Self {
        Self { config }
    }

    /// Run Nyash based on the configuration
    pub fn run(&self) {
        // New behavior-preserving delegator
        self.run_refactored();
    }

    // init_bid_plugins moved to runner_plugin_init.rs

    /// Execute file-based mode with backend selection
    pub(crate) fn run_file(&self, filename: &str) {
        dispatch::execute_file_with_backend(self, filename);
    }

    /// Minimal AOT build pipeline driven by nyash.toml (mvp)
    fn run_build_mvp(&self, cfg_path: &str) -> Result<(), String> {
        build::run_build_mvp_impl(self, cfg_path)
    }
}

#[cfg(not(feature = "jit-direct-only"))]
impl NyashRunner {
    /// New behavior-preserving refactor of run(): structured into smaller helpers
    fn run_refactored(&self) {
        // Early: macro child
        if let Some(ref macro_file) = self.config.macro_expand_child {
            crate::runner::modes::macro_child::run_macro_child(macro_file);
            return;
        }
        let groups = self.config.as_groups();
        // Early: build
        if let Some(cfg_path) = groups.build.path.clone() {
            if let Err(e) = self.run_build_mvp(&cfg_path) {
                eprintln!("❌ build error: {}", e);
                std::process::exit(1);
            }
            return;
        }
        // Preprocess usings and directives (includes dep-tree log)
        self.preprocess_usings_and_directives(&groups);
        // JSON v0 bridge
        if self.try_run_json_v0_pipe() { return; }
        // Named task
        if let Some(task) = groups.run_task.clone() {
            if let Err(e) = run_named_task(&task) {
                eprintln!("❌ Task error: {}", e);
                process::exit(1);
            }
            return;
        }
        // Common env + runtime/plugins
        self.apply_common_env(&groups);
        self.init_runtime_and_plugins(&groups);
        // Backend config + policy
        self.configure_backend(&groups);
        self.enforce_runtime_jit_policy(&groups);
        // Benchmark
        if self.maybe_run_benchmark(&groups) { return; }
        // Dispatch
        self.dispatch_entry(&groups);
    }

    // ---- Helpers (extracted from original run) ----

    fn preprocess_usings_and_directives(&self, groups: &crate::cli::CliGroups) {
        use pipeline::resolve_using_target;
        // Initialize UsingContext (defaults + nyash.toml + env)
        let mut using_ctx = self.init_using_context();
        // Collect CLI --using SPEC into (target, alias)
        let mut pending_using: Vec<(String, Option<String>)> = Vec::new();
        for spec in &groups.input.cli_usings {
            let s = spec.trim();
            if s.is_empty() { continue; }
            let (target, alias) = if let Some(pos) = s.find(" as ") {
                (s[..pos].trim().to_string(), Some(s[pos + 4..].trim().to_string()))
            } else { (s.to_string(), None) };
            let is_path = target.starts_with('"') || target.starts_with("./") || target.starts_with('/') || target.ends_with(".nyash");
            if is_path {
                let path = target.trim_matches('"').to_string();
                let name = alias.clone().unwrap_or_else(|| {
                    std::path::Path::new(&path).file_stem().and_then(|s| s.to_str()).unwrap_or("module").to_string()
                });
                pending_using.push((name, Some(path)));
            } else {
                pending_using.push((target, alias));
            }
        }
        // Apply pending modules (from context) to registry as StringBox
        for (ns, path) in using_ctx.pending_modules.iter() {
            let sb = crate::box_trait::StringBox::new(path.clone());
            crate::runtime::modules_registry::set(ns.clone(), Box::new(sb));
        }
        // Optional dependency tree bridge (log-only)
        if let Ok(dep_path) = std::env::var("NYASH_DEPS_JSON") {
            match std::fs::read_to_string(&dep_path) {
                Ok(s) => {
                    let bytes = s.as_bytes().len();
                    let mut root_info = String::new();
                    if let Ok(v) = serde_json::from_str::<serde_json::Value>(&s) {
                        if let Some(r) = v.get("root_path").and_then(|x| x.as_str()) {
                            root_info = format!(" root='{}'", r);
                        }
                    }
                    crate::cli_v!("[deps] loaded {} bytes from{} {}", bytes, if root_info.is_empty() { "" } else { ":" }, root_info);
                }
                Err(e) => { crate::cli_v!("[deps] read error: {}", e); }
            }
        }
        // If a file is provided, apply script-level directives and late using/env merges
        if let Some(ref filename) = groups.input.file {
            if let Ok(code) = fs::read_to_string(filename) {
                // Apply directives and lint
                let strict_fields = std::env::var("NYASH_FIELDS_TOP_STRICT").ok().as_deref() == Some("1");
                if let Err(e) = cli_directives::apply_cli_directives_from_source(&code, strict_fields, groups.debug.cli_verbose) {
                    eprintln!("❌ Lint/Directive error: {}", e);
                    std::process::exit(1);
                }
                // Late env overrides (paths/modules)
                if let Ok(paths) = std::env::var("NYASH_USING_PATH") {
                    for p in paths.split(':') { let p = p.trim(); if !p.is_empty() { using_ctx.using_paths.push(p.to_string()); } }
                }
                if let Ok(mods) = std::env::var("NYASH_MODULES") {
                    for ent in mods.split(',') {
                        if let Some((k, v)) = ent.split_once('=') {
                            let k = k.trim(); let v = v.trim();
                            if !k.is_empty() && !v.is_empty() { using_ctx.pending_modules.push((k.to_string(), v.to_string())); }
                        }
                    }
                }
                // Re-apply pending modules in case env added more (idempotent)
                for (ns, path) in using_ctx.pending_modules.iter() {
                    let sb = nyash_rust::box_trait::StringBox::new(path.clone());
                    nyash_rust::runtime::modules_registry::set(ns.clone(), Box::new(sb));
                }
                // Resolve CLI --using entries against context and register values (with aliasing)
                let strict = std::env::var("NYASH_USING_STRICT").ok().as_deref() == Some("1");
                let verbose = crate::config::env::cli_verbose();
                let ctx = std::path::Path::new(filename).parent();
                for (ns, alias) in pending_using.iter() {
                    let value = match resolve_using_target(ns, false, &using_ctx.pending_modules, &using_ctx.using_paths, &using_ctx.aliases, ctx, strict, verbose) {
                        Ok(v) => v,
                        Err(e) => { eprintln!("❌ using: {}", e); std::process::exit(1); }
                    };
                    let sb = nyash_rust::box_trait::StringBox::new(value.clone());
                    nyash_rust::runtime::modules_registry::set(ns.clone(), Box::new(sb));
                    if let Some(a) = alias {
                        let sb2 = nyash_rust::box_trait::StringBox::new(value);
                        nyash_rust::runtime::modules_registry::set(a.clone(), Box::new(sb2));
                    }
                }
            }
        }
    }

    /// Apply early environment toggles that affect CLI behavior and VM stats.
    /// Side effects: sets `NYASH_CLI_VERBOSE`, `NYASH_GC_MODE` when specified by CLI groups.
    fn apply_common_env(&self, groups: &crate::cli::CliGroups) {
        if groups.debug.cli_verbose { std::env::set_var("NYASH_CLI_VERBOSE", "1"); }
        if let Some(ref m) = groups.gc_mode { if !m.trim().is_empty() { std::env::set_var("NYASH_GC_MODE", m); } }
    }

    // init_runtime_and_plugins moved to runner/plugins.rs

    /// Configure backend knobs (VM/JIT) from CLI flags and env, merging with runtime capabilities.
    /// Side effects: writes environment variables for flags and applies JIT config via nyash_rust::jit::config.
    fn configure_backend(&self, groups: &crate::cli::CliGroups) {
        if groups.backend.vm_stats { std::env::set_var("NYASH_VM_STATS", "1"); }
        if groups.backend.vm_stats_json { std::env::set_var("NYASH_VM_STATS_JSON", "1"); }
        {
            if groups.backend.jit.events { std::env::set_var("NYASH_JIT_EVENTS", "1"); }
            if groups.backend.jit.events_compile { std::env::set_var("NYASH_JIT_EVENTS_COMPILE", "1"); }
            if groups.backend.jit.events_runtime { std::env::set_var("NYASH_JIT_EVENTS_RUNTIME", "1"); }
            if let Some(ref p) = groups.backend.jit.events_path { std::env::set_var("NYASH_JIT_EVENTS_PATH", p); }
            let mut jc = nyash_rust::jit::config::JitConfig::from_env();
            jc.exec |= groups.backend.jit.exec;
            jc.stats |= groups.backend.jit.stats;
            jc.stats_json |= groups.backend.jit.stats_json;
            jc.dump |= groups.backend.jit.dump;
            if groups.backend.jit.threshold.is_some() { jc.threshold = groups.backend.jit.threshold; }
            jc.phi_min |= groups.backend.jit.phi_min;
            jc.hostcall |= groups.backend.jit.hostcall;
            jc.handle_debug |= groups.backend.jit.handle_debug;
            jc.native_f64 |= groups.backend.jit.native_f64;
            jc.native_bool |= groups.backend.jit.native_bool;
            let events_on = std::env::var("NYASH_JIT_EVENTS").ok().as_deref() == Some("1")
                || std::env::var("NYASH_JIT_EVENTS_COMPILE").ok().as_deref() == Some("1")
                || std::env::var("NYASH_JIT_EVENTS_RUNTIME").ok().as_deref() == Some("1");
            if events_on && jc.threshold.is_none() { jc.threshold = Some(1); }
            if groups.backend.jit.only { std::env::set_var("NYASH_JIT_ONLY", "1"); }
            let caps = nyash_rust::jit::config::probe_capabilities();
            jc = nyash_rust::jit::config::apply_runtime_caps(jc, caps);
            if let Some(path) = &groups.emit.emit_cfg { std::env::set_var("NYASH_JIT_DOT", path); jc.dump = true; }
            jc.apply_env();
            nyash_rust::jit::config::set_current(jc.clone());
        }
        if std::env::var("NYASH_JIT_STRICT").ok().as_deref() == Some("1") {
            if std::env::var("NYASH_JIT_ARGS_HANDLE_ONLY").ok().is_none() { std::env::set_var("NYASH_JIT_ARGS_HANDLE_ONLY", "1"); }
            if std::env::var("NYASH_JIT_ONLY").ok().is_none() { std::env::set_var("NYASH_JIT_ONLY", "1"); }
        }
    }

    /// Enforce runtime policy for JIT execution when AOT object output is absent.
    /// Side effects: may set `NYASH_JIT_EXEC=0` when policy requires.
    fn enforce_runtime_jit_policy(&self, groups: &crate::cli::CliGroups) {
        if !groups.compile_native && !groups.backend.jit.direct {
            let aot_obj = std::env::var("NYASH_AOT_OBJECT_OUT").ok();
            if aot_obj.is_none() || aot_obj.as_deref() == Some("") {
                std::env::set_var("NYASH_JIT_EXEC", "0");
            }
        }
    }

    /// Optionally run the benchmark suite and exit, depending on CLI flags.
    /// Returns true when a benchmark run occurred.
    fn maybe_run_benchmark(&self, groups: &crate::cli::CliGroups) -> bool {
        if groups.benchmark {
            println!("📊 Nyash Performance Benchmark Suite");
            println!("====================================");
            println!("Running {} iterations per test...", groups.iterations);
            println!();
            #[cfg(feature = "vm-legacy")]
            { self.execute_benchmark_mode(); return true; }
            #[cfg(not(feature = "vm-legacy"))]
            { eprintln!("❌ Benchmark mode requires VM backend. Rebuild with --features vm-legacy."); std::process::exit(1); }
        }
        false
    }

    /// Final dispatch to selected execution mode (file/JIT-direct or demos).
    fn dispatch_entry(&self, groups: &crate::cli::CliGroups) {
        if let Some(ref filename) = groups.input.file {
            if groups.backend.jit.direct { self.run_file_jit_direct(filename); return; }
            self.run_file(filename);
        } else { demos::run_all_demos(); }
    }
}

impl NyashRunner {
    /// Run a file through independent JIT engine (no VM execute loop)
    fn run_file_jit_direct(&self, filename: &str) {
        use nyash_rust::{mir::MirCompiler, parser::NyashParser};
        use std::fs;
        // Small helper for unified error output (text or JSON)
        let emit_err = |phase: &str, code: &str, msg: &str| {
            if std::env::var("NYASH_JIT_STATS_JSON").ok().as_deref() == Some("1")
                || std::env::var("NYASH_JIT_ERROR_JSON").ok().as_deref() == Some("1")
            {
                let payload = serde_json::json!({
                    "kind": "jit_direct_error",
                    "phase": phase,
                    "code": code,
                    "message": msg,
                    "file": filename,
                });
                println!("{}", payload.to_string());
            } else {
                eprintln!("[JIT-direct][{}][{}] {}", phase, code, msg);
            }
        };
        // Require cranelift feature at runtime by attempting compile; if unavailable compile_function returns None
        let code = match fs::read_to_string(filename) {
            Ok(s) => s,
            Err(e) => {
                emit_err("read_file", "IO", &format!("{}", e));
                std::process::exit(1);
            }
        };
        let ast = match NyashParser::parse_from_string(&code) {
            Ok(a) => a,
            Err(e) => {
                emit_err("parse", "SYNTAX", &format!("{}", e));
                std::process::exit(1);
            }
        };
        let mut mc = MirCompiler::new();
        let cr = match mc.compile(ast) {
            Ok(m) => m,
            Err(e) => {
                emit_err("mir", "MIR_COMPILE", &format!("{}", e));
                std::process::exit(1);
            }
        };
        let func = match cr.module.functions.get("main") {
            Some(f) => f,
            None => {
                emit_err("mir", "NO_MAIN", "No main function found");
                std::process::exit(1);
            }
        };

        // Guard: refuse write-effects in jit-direct when policy.read_only
        {
            use nyash_rust::mir::effect::Effect;
            let policy = nyash_rust::jit::policy::current();
            let mut writes = 0usize;
            for (_bbid, bb) in func.blocks.iter() {
                for inst in bb.instructions.iter() {
                    let mask = inst.effects();
                    if mask.contains(Effect::WriteHeap) {
                        writes += 1;
                    }
                }
                if let Some(term) = &bb.terminator {
                    if term.effects().contains(Effect::WriteHeap) {
                        writes += 1;
                    }
                }
            }
            if policy.read_only && writes > 0 {
                emit_err(
                    "policy",
                    "WRITE_EFFECTS",
                    &format!(
                        "write-effects detected ({} ops). jit-direct is read-only at this stage.",
                        writes
                    ),
                );
                std::process::exit(1);
            }
        }

        // jit-direct 安定化: 分岐合流(PHI)は明示ブロック引数で配線
        {
            let mut cfg = nyash_rust::jit::config::current();
            cfg.phi_min = true; // enable multi-PHI arg passing/join
            nyash_rust::jit::config::set_current(cfg);
        }
        // Prepare minimal runtime hooks so JIT externs (checkpoint/await) can reach GC/scheduler
        {
            let rt = nyash_rust::runtime::NyashRuntime::new();
            nyash_rust::runtime::global_hooks::set_from_runtime(&rt);
        }
        let mut engine = nyash_rust::jit::engine::JitEngine::new();
        match engine.compile_function("main", func) {
            Some(h) => {
                // Optional event: compile
                nyash_rust::jit::events::emit(
                    "compile",
                    &func.signature.name,
                    Some(h),
                    None,
                    serde_json::json!({}),
                );
                // Parse JIT args from env: NYASH_JIT_ARGS (comma-separated), with optional type prefixes
                // Formats per arg: i:123, f:3.14, b:true/false, h:42 (handle), or bare numbers (int), true/false (bool)
                let mut jit_args: Vec<nyash_rust::jit::abi::JitValue> = Vec::new();
                if let Ok(s) = std::env::var("NYASH_JIT_ARGS") {
                    for raw in s.split(',') {
                        let t = raw.trim();
                        if t.is_empty() {
                            continue;
                        }
                        let v = if let Some(rest) = t.strip_prefix("i:") {
                            rest.parse::<i64>()
                                .ok()
                                .map(nyash_rust::jit::abi::JitValue::I64)
                        } else if let Some(rest) = t.strip_prefix("f:") {
                            rest.parse::<f64>()
                                .ok()
                                .map(nyash_rust::jit::abi::JitValue::F64)
                        } else if let Some(rest) = t.strip_prefix("b:") {
                            let b = matches!(rest, "1" | "true" | "True" | "TRUE");
                            Some(nyash_rust::jit::abi::JitValue::Bool(b))
                        } else if let Some(rest) = t.strip_prefix("h:") {
                            rest.parse::<u64>()
                                .ok()
                                .map(nyash_rust::jit::abi::JitValue::Handle)
                        } else if t.eq_ignore_ascii_case("true") || t == "1" {
                            Some(nyash_rust::jit::abi::JitValue::Bool(true))
                        } else if t.eq_ignore_ascii_case("false") || t == "0" {
                            Some(nyash_rust::jit::abi::JitValue::Bool(false))
                        } else if let Ok(iv) = t.parse::<i64>() {
                            Some(nyash_rust::jit::abi::JitValue::I64(iv))
                        } else if let Ok(fv) = t.parse::<f64>() {
                            Some(nyash_rust::jit::abi::JitValue::F64(fv))
                        } else {
                            None
                        };
                        if let Some(jv) = v {
                            jit_args.push(jv);
                        }
                    }
                }
                // Coerce args to expected MIR types
                use nyash_rust::mir::MirType;
                let expected = &func.signature.params;
                if expected.len() != jit_args.len() {
                    emit_err(
                        "args",
                        "COUNT_MISMATCH",
                        &format!("expected={}, passed={}", expected.len(), jit_args.len()),
                    );
                    eprintln!("Hint: set NYASH_JIT_ARGS as comma-separated values, e.g., i:42,f:3.14,b:true");
                    std::process::exit(1);
                }
                let mut coerced: Vec<nyash_rust::jit::abi::JitValue> =
                    Vec::with_capacity(jit_args.len());
                for (i, (exp, got)) in expected.iter().zip(jit_args.iter()).enumerate() {
                    let cv = match exp {
                        MirType::Integer => match got {
                            nyash_rust::jit::abi::JitValue::I64(v) => {
                                nyash_rust::jit::abi::JitValue::I64(*v)
                            }
                            nyash_rust::jit::abi::JitValue::F64(f) => {
                                nyash_rust::jit::abi::JitValue::I64(*f as i64)
                            }
                            nyash_rust::jit::abi::JitValue::Bool(b) => {
                                nyash_rust::jit::abi::JitValue::I64(if *b { 1 } else { 0 })
                            }
                            _ => {
                                emit_err(
                                    "args",
                                    "TYPE_MISMATCH",
                                    &format!("param#{} expects Integer", i),
                                );
                                std::process::exit(1);
                            }
                        },
                        MirType::Float => match got {
                            nyash_rust::jit::abi::JitValue::F64(f) => {
                                nyash_rust::jit::abi::JitValue::F64(*f)
                            }
                            nyash_rust::jit::abi::JitValue::I64(v) => {
                                nyash_rust::jit::abi::JitValue::F64(*v as f64)
                            }
                            nyash_rust::jit::abi::JitValue::Bool(b) => {
                                nyash_rust::jit::abi::JitValue::F64(if *b { 1.0 } else { 0.0 })
                            }
                            _ => {
                                emit_err(
                                    "args",
                                    "TYPE_MISMATCH",
                                    &format!("param#{} expects Float", i),
                                );
                                std::process::exit(1);
                            }
                        },
                        MirType::Bool => match got {
                            nyash_rust::jit::abi::JitValue::Bool(b) => {
                                nyash_rust::jit::abi::JitValue::Bool(*b)
                            }
                            nyash_rust::jit::abi::JitValue::I64(v) => {
                                nyash_rust::jit::abi::JitValue::Bool(*v != 0)
                            }
                            nyash_rust::jit::abi::JitValue::F64(f) => {
                                nyash_rust::jit::abi::JitValue::Bool(*f != 0.0)
                            }
                            _ => {
                                emit_err(
                                    "args",
                                    "TYPE_MISMATCH",
                                    &format!("param#{} expects Bool", i),
                                );
                                std::process::exit(1);
                            }
                        },
                        MirType::String
                        | MirType::Box(_)
                        | MirType::Array(_)
                        | MirType::Future(_) => match got {
                            nyash_rust::jit::abi::JitValue::Handle(h) => {
                                nyash_rust::jit::abi::JitValue::Handle(*h)
                            }
                            _ => {
                                emit_err(
                                    "args",
                                    "TYPE_MISMATCH",
                                    &format!("param#{} expects handle (h:<id>)", i),
                                );
                                std::process::exit(1);
                            }
                        },
                        MirType::Void | MirType::Unknown => {
                            // Keep as-is
                            *got
                        }
                    };
                    coerced.push(cv);
                }
                nyash_rust::jit::rt::set_current_jit_args(&coerced);
                let t0 = std::time::Instant::now();
                let out = engine.execute_handle(h, &coerced);
                match out {
                    Some(v) => {
                        let ms = t0.elapsed().as_millis();
                        nyash_rust::jit::events::emit(
                            "execute",
                            &func.signature.name,
                            Some(h),
                            Some(ms),
                            serde_json::json!({}),
                        );
                        // Normalize result according to MIR return type for friendly output
                        use nyash_rust::mir::MirType;
                        let ret_ty = &func.signature.return_type;
                        let vmv = match (ret_ty, v) {
                            (MirType::Bool, nyash_rust::jit::abi::JitValue::I64(i)) => {
                                nyash_rust::backend::vm::VMValue::Bool(i != 0)
                            }
                            (MirType::Bool, nyash_rust::jit::abi::JitValue::Bool(b)) => {
                                nyash_rust::backend::vm::VMValue::Bool(b)
                            }
                            (MirType::Float, nyash_rust::jit::abi::JitValue::F64(f)) => {
                                nyash_rust::backend::vm::VMValue::Float(f)
                            }
                            (MirType::Float, nyash_rust::jit::abi::JitValue::I64(i)) => {
                                nyash_rust::backend::vm::VMValue::Float(i as f64)
                            }
                            // Default adapter for other combos
                            _ => nyash_rust::jit::abi::adapter::from_jit_value(v),
                        };
                        println!("✅ JIT-direct execution completed successfully!");
                        // Pretty print with expected type tag
                        let (ety, sval) = match (ret_ty, &vmv) {
                            (MirType::Bool, nyash_rust::backend::vm::VMValue::Bool(b)) => {
                                ("Bool", b.to_string())
                            }
                            (MirType::Float, nyash_rust::backend::vm::VMValue::Float(f)) => {
                                ("Float", format!("{}", f))
                            }
                            (MirType::Integer, nyash_rust::backend::vm::VMValue::Integer(i)) => {
                                ("Integer", i.to_string())
                            }
                            // Fallbacks
                            (_, nyash_rust::backend::vm::VMValue::Integer(i)) => {
                                ("Integer", i.to_string())
                            }
                            (_, nyash_rust::backend::vm::VMValue::Float(f)) => {
                                ("Float", format!("{}", f))
                            }
                            (_, nyash_rust::backend::vm::VMValue::Bool(b)) => {
                                ("Bool", b.to_string())
                            }
                            (_, nyash_rust::backend::vm::VMValue::String(s)) => {
                                ("String", s.clone())
                            }
                            (_, nyash_rust::backend::vm::VMValue::BoxRef(arc)) => {
                                ("BoxRef", arc.type_name().to_string())
                            }
                            (_, nyash_rust::backend::vm::VMValue::Future(_)) => {
                                ("Future", "<future>".to_string())
                            }
                            (_, nyash_rust::backend::vm::VMValue::Void) => {
                                ("Void", "void".to_string())
                            }
                        };
                        println!("ResultType(MIR): {}", ety);
                        println!("Result: {}", sval);
                        // Optional JSON stats
                        if std::env::var("NYASH_JIT_STATS_JSON").ok().as_deref() == Some("1") {
                            let cfg = nyash_rust::jit::config::current();
                            let caps = nyash_rust::jit::config::probe_capabilities();
                            let (phi_t, phi_b1, ret_b) = engine.last_lower_stats();
                            let abi_mode = if cfg.native_bool_abi && caps.supports_b1_sig {
                                "b1_bool"
                            } else {
                                "i64_bool"
                            };
                            let payload = serde_json::json!({
                                "version": 1,
                                "function": func.signature.name,
                                "abi_mode": abi_mode,
                                "abi_b1_enabled": cfg.native_bool_abi,
                                "abi_b1_supported": caps.supports_b1_sig,
                                "b1_norm_count": nyash_rust::jit::rt::b1_norm_get(),
                                "ret_bool_hint_count": nyash_rust::jit::rt::ret_bool_hint_get(),
                                "phi_total_slots": phi_t,
                                "phi_b1_slots": phi_b1,
                                "ret_bool_hint_used": ret_b,
                            });
                            println!("{}", payload.to_string());
                        }
                    }
                    None => {
                        nyash_rust::jit::events::emit(
                            "fallback",
                            &func.signature.name,
                            Some(h),
                            None,
                            serde_json::json!({"reason":"trap_or_missing"}),
                        );
                        emit_err(
                            "execute",
                            "TRAP_OR_MISSING",
                            "execution failed (trap or missing handle)",
                        );
                        std::process::exit(1);
                    }
                }
            }
            None => {
                emit_err(
                    "compile",
                    "UNAVAILABLE",
                    "Build with --features cranelift-jit",
                );
                std::process::exit(1);
            }
        }
    }
}

// Demo functions (moved from main.rs)
// moved to demos.rs

// moved to demos.rs

// moved to demos.rs

// moved to demos.rs

// moved to demos.rs

// moved to demos.rs