use super::super::NyashRunner;
use crate::runner::json_v0_bridge;
use nyash_rust::{parser::NyashParser, interpreter::NyashInterpreter};
// Use the library crate's plugin init module rather than the bin crate root
use std::{fs, process};
use std::io::Read;
use std::process::Stdio;
use std::time::{Duration, Instant};
use std::thread::sleep;
use crate::runner::pipeline::{suggest_in_base, resolve_using_target};
use crate::runner::trace::cli_verbose;
use crate::cli_v;

// (moved) suggest_in_base is now in runner/pipeline.rs

impl NyashRunner {
    // legacy run_file_legacy removed (was commented out)

    /// Helper: run PyVM harness over a MIR module, returning the exit code
    fn run_pyvm_harness(&self, module: &nyash_rust::mir::MirModule, tag: &str) -> Result<i32, String> {
        super::common_util::pyvm::run_pyvm_harness(module, tag)
    }

    /// Helper: try external selfhost compiler EXE to parse Ny -> JSON v0 and return MIR module
    /// Returns Some(module) on success, None on failure (timeout/invalid output/missing exe)
    fn exe_try_parse_json_v0(&self, filename: &str, timeout_ms: u64) -> Option<nyash_rust::mir::MirModule> {
        super::common_util::selfhost_exe::exe_try_parse_json_v0(filename, timeout_ms)
    }

    /// Phase-15.3: Attempt Ny compiler pipeline (Ny -> JSON v0 via Ny program), then execute MIR
    pub(crate) fn try_run_ny_compiler_pipeline(&self, filename: &str) -> bool {
        // Delegate to centralized selfhost pipeline to avoid drift
        self.try_run_selfhost_pipeline(filename)
    }

    /// Execute Nyash file with interpreter (common helper)
    pub(crate) fn execute_nyash_file(&self, filename: &str) {
        let quiet_pipe = std::env::var("NYASH_JSON_ONLY").ok().as_deref() == Some("1");
        // Ensure runtime and plugins are initialized via unified helper (idempotent)
        let groups = self.config.as_groups();
        self.init_runtime_and_plugins(&groups);
        // Read the file
        let code = match fs::read_to_string(filename) {
            Ok(content) => content,
            Err(e) => { eprintln!("❌ Error reading file {}: {}", filename, e); process::exit(1); }
        };
        if crate::config::env::cli_verbose() && !quiet_pipe {
            println!("📝 File contents:\n{}", code);
            println!("\n🚀 Parsing and executing...\n");
        }

        // Using handling: either strip+inline (legacy) or AST-based prelude merge (when NYASH_USING_AST=1)
        let use_ast = std::env::var("NYASH_USING_AST").ok().as_deref() == Some("1");
        let mut code_ref: &str = &code;
        let cleaned_code_owned;
        let mut prelude_asts: Vec<nyash_rust::ast::ASTNode> = Vec::new();
        if crate::config::env::enable_using() {
            if use_ast {
                match crate::runner::modes::common_util::resolve::collect_using_and_strip(self, &code, filename) {
                    Ok((clean, paths)) => {
                        cleaned_code_owned = clean; code_ref = &cleaned_code_owned;
                        // Parse each prelude file into AST and store
                        for p in paths {
                            match std::fs::read_to_string(&p) {
                                Ok(src) => {
                                    match NyashParser::parse_from_string(&src) {
                                        Ok(ast) => prelude_asts.push(ast),
                                        Err(e) => { eprintln!("❌ Parse error in using prelude {}: {}", p, e); std::process::exit(1); }
                                    }
                                }
                                Err(e) => { eprintln!("❌ Error reading using prelude {}: {}", p, e); std::process::exit(1); }
                            }
                        }
                    }
                    Err(e) => { eprintln!("❌ {}", e); std::process::exit(1); }
                }
            } else {
                match crate::runner::modes::common_util::resolve::strip_using_and_register(self, &code, filename) {
                    Ok(s) => { cleaned_code_owned = s; code_ref = &cleaned_code_owned; }
                    Err(e) => { eprintln!("❌ {}", e); std::process::exit(1); }
                }
            }
        }
        // Optional dev sugar: @name[:T] = expr → local name[:T] = expr (line-head only)
        let preexpanded_owned;
        {
            let s = crate::runner::modes::common_util::resolve::preexpand_at_local(code_ref);
            preexpanded_owned = s;
            code_ref = &preexpanded_owned;
        }

        // Parse the code with debug fuel limit
        let groups = self.config.as_groups();
        eprintln!("🔍 DEBUG: Starting parse with fuel: {:?}...", groups.debug.debug_fuel);
        let main_ast = match NyashParser::parse_from_string_with_fuel(code_ref, groups.debug.debug_fuel) {
            Ok(ast) => { eprintln!("🔍 DEBUG: Parse completed, AST created"); ast },
            Err(e) => { eprintln!("❌ Parse error: {}", e); process::exit(1); }
        };
        // When using AST prelude mode, combine prelude ASTs + main AST into one Program
        let ast = if use_ast && !prelude_asts.is_empty() {
            use nyash_rust::ast::ASTNode;
            let mut combined: Vec<ASTNode> = Vec::new();
            for a in prelude_asts {
                if let ASTNode::Program { statements, .. } = a { combined.extend(statements); }
            }
            if let ASTNode::Program { statements, .. } = main_ast.clone() {
                combined.extend(statements);
            }
            ASTNode::Program { statements: combined, span: nyash_rust::ast::Span::unknown() }
        } else { main_ast };

        // Stage-0: import loader (top-level only) — resolve path and register in modules registry
        if let nyash_rust::ast::ASTNode::Program { statements, .. } = &ast {
            for st in statements {
                if let nyash_rust::ast::ASTNode::ImportStatement { path, alias, .. } = st {
                    // resolve path relative to current file if not absolute
                    let mut p = std::path::PathBuf::from(path);
                    if p.is_relative() {
                        if let Some(dir) = std::path::Path::new(filename).parent() {
                            p = dir.join(&p);
                        }
                    }
                    let exists = p.exists();
                    if !exists {
                        if std::env::var("NYASH_USING_STRICT").ok().as_deref() == Some("1") {
                            eprintln!("❌ import: path not found: {} (from {})", p.display(), filename);
                            process::exit(1);
                        } else if crate::config::env::cli_verbose() || std::env::var("NYASH_IMPORT_TRACE").ok().as_deref() == Some("1") {
                            eprintln!("[import] path not found (continuing): {}", p.display());
                        }
                    }
                    let key = if let Some(a) = alias { a.clone() } else {
                        std::path::Path::new(path)
                            .file_stem().and_then(|s| s.to_str())
                            .unwrap_or(path)
                            .to_string()
                    };
                    let value = if exists { p.to_string_lossy().to_string() } else { path.clone() };
                    let sb = nyash_rust::box_trait::StringBox::new(value);
                    nyash_rust::runtime::modules_registry::set(key, Box::new(sb));
                }
            }
        }

        if crate::config::env::cli_verbose() && !quiet_pipe {
            if crate::config::env::cli_verbose() { println!("✅ Parse successful!"); }
        }

        // Execute the AST
        let mut interpreter = NyashInterpreter::new();
        eprintln!("🔍 DEBUG: Starting execution...");
        match interpreter.execute(ast) {
            Ok(result) => {
                if crate::config::env::cli_verbose() && !quiet_pipe {
                    if crate::config::env::cli_verbose() { println!("✅ Execution completed successfully!"); }
                }
                // Normalize display via semantics: prefer numeric, then string, then fallback
                let disp = {
                    // Special-case: plugin IntegerBox → call .get to fetch numeric value
                    if let Some(p) = result.as_any().downcast_ref::<nyash_rust::runtime::plugin_loader_v2::PluginBoxV2>() {
                        if p.box_type == "IntegerBox" {
                            // Scope the lock strictly to this block
                            let fetched = {
                                let host = nyash_rust::runtime::get_global_plugin_host();
                                let res = if let Ok(ro) = host.read() {
                                    if let Ok(Some(vb)) = ro.invoke_instance_method("IntegerBox", "get", p.instance_id(), &[]) {
                                        if let Some(ib) = vb.as_any().downcast_ref::<nyash_rust::box_trait::IntegerBox>() {
                                            Some(ib.value.to_string())
                                        } else {
                                            Some(vb.to_string_box().value)
                                        }
                                    } else { None }
                                } else { None };
                                res
                            };
                            if let Some(s) = fetched { s } else {
                                nyash_rust::runtime::semantics::coerce_to_i64(result.as_ref())
                                    .map(|i| i.to_string())
                                    .or_else(|| nyash_rust::runtime::semantics::coerce_to_string(result.as_ref()))
                                    .unwrap_or_else(|| result.to_string_box().value)
                            }
                        } else {
                            nyash_rust::runtime::semantics::coerce_to_i64(result.as_ref())
                                .map(|i| i.to_string())
                                .or_else(|| nyash_rust::runtime::semantics::coerce_to_string(result.as_ref()))
                                .unwrap_or_else(|| result.to_string_box().value)
                        }
                    } else {
                        nyash_rust::runtime::semantics::coerce_to_i64(result.as_ref())
                            .map(|i| i.to_string())
                            .or_else(|| nyash_rust::runtime::semantics::coerce_to_string(result.as_ref()))
                            .unwrap_or_else(|| result.to_string_box().value)
                    }
                };
                if !quiet_pipe { println!("Result: {}", disp); }
            },
            Err(e) => {
                eprintln!("❌ Runtime error:\n{}", e.detailed_message(Some(&code)));
                process::exit(1);
            }
        }
    }
}