/*!
 * Runner dispatch helpers — execute MIR module and report result
 */

use super::*;
use crate::runner::json_v0_bridge;
use nyash_rust::parser::NyashParser;
use std::{fs, process};

impl NyashRunner {
    /// Thin file dispatcher: select backend and delegate to mode executors
    pub(crate) fn run_file(&self, filename: &str) {
        // Selfhost pipeline (Ny -> JSON v0) behind env gate
        if std::env::var("NYASH_USE_NY_COMPILER").ok().as_deref() == Some("1") {
            if self.try_run_selfhost_pipeline(filename) {
                return;
            } else if std::env::var("NYASH_CLI_VERBOSE").ok().as_deref() == Some("1") {
                eprintln!("[ny-compiler] fallback to default path (MVP unavailable for this input)");
            }
        }

        // Direct v0 bridge when requested via CLI/env
        let use_ny_parser = self.config.parser_ny || std::env::var("NYASH_USE_NY_PARSER").ok().as_deref() == Some("1");
        if use_ny_parser {
            let code = match fs::read_to_string(filename) {
                Ok(content) => content,
                Err(e) => { eprintln!("❌ Error reading file {}: {}", filename, e); process::exit(1); }
            };
            match json_v0_bridge::parse_source_v0_to_module(&code) {
                Ok(module) => {
                    if std::env::var("NYASH_CLI_VERBOSE").ok().as_deref() == Some("1") {
                        println!("🚀 Nyash MIR Interpreter - (parser=ny) Executing file: {} 🚀", filename);
                    }
                    self.execute_mir_module(&module);
                    return;
                }
                Err(e) => { eprintln!("❌ Direct bridge parse error: {}", e); process::exit(1); }
            }
        }

        // AST dump mode
        if self.config.dump_ast {
            println!("🧠 Nyash AST Dump - Processing file: {}", filename);
            let code = match fs::read_to_string(filename) {
                Ok(content) => content,
                Err(e) => { eprintln!("❌ Error reading file {}: {}", filename, e); process::exit(1); }
            };
            let ast = match NyashParser::parse_from_string(&code) {
                Ok(ast) => ast,
                Err(e) => { eprintln!("❌ Parse error: {}", e); process::exit(1); }
            };
            println!("{:#?}", ast);
            return;
        }

        // MIR dump/verify
        if self.config.dump_mir || self.config.verify_mir {
            if std::env::var("NYASH_CLI_VERBOSE").ok().as_deref() == Some("1") {
                println!("🚀 Nyash MIR Compiler - Processing file: {} 🚀", filename);
            }
            self.execute_mir_mode(filename);
            return;
        }

        // WASM / AOT (feature-gated)
        if self.config.compile_wasm {
            #[cfg(feature = "wasm-backend")]
            { self.execute_wasm_mode(filename); return; }
            #[cfg(not(feature = "wasm-backend"))]
            { eprintln!("❌ WASM backend not available. Please rebuild with: cargo build --features wasm-backend"); process::exit(1); }
        }
        if self.config.compile_native {
            #[cfg(feature = "cranelift-jit")]
            { self.execute_aot_mode(filename); return; }
            #[cfg(not(feature = "cranelift-jit"))]
            { eprintln!("❌ Native AOT compilation requires Cranelift. Please rebuild: cargo build --features cranelift-jit"); process::exit(1); }
        }

        // Backend selection
        match self.config.backend.as_str() {
            "mir" => {
                if std::env::var("NYASH_CLI_VERBOSE").ok().as_deref() == Some("1") {
                    println!("🚀 Nyash MIR Interpreter - Executing file: {} 🚀", filename);
                }
                self.execute_mir_mode(filename);
            }
            #[cfg(feature = "cranelift-jit")]
            "jit-direct" => {
                if std::env::var("NYASH_CLI_VERBOSE").ok().as_deref() == Some("1") {
                    println!("⚡ Nyash JIT-Direct Backend - Executing file: {} ⚡", filename);
                }
                #[cfg(feature = "cranelift-jit")]
                {
                    crate::runner::modes::cranelift::execute_jit_direct_mode(self, filename);
                }
                #[cfg(not(feature = "cranelift-jit"))]
                {
                    eprintln!("❌ Cranelift backend not available. Please rebuild with: cargo build --features cranelift-jit");
                    process::exit(1);
                }
            }
            "llvm" => {
                if std::env::var("NYASH_CLI_VERBOSE").ok().as_deref() == Some("1") {
                    println!("⚡ Nyash LLVM Backend - Executing file: {} ⚡", filename);
                }
                self.execute_llvm_mode(filename);
            }
            _ => {
                if std::env::var("NYASH_CLI_VERBOSE").ok().as_deref() == Some("1") {
                    println!("🦀 Nyash Rust Implementation - Executing file: {} 🦀", filename);
                    if let Some(fuel) = self.config.debug_fuel {
                        println!("🔥 Debug fuel limit: {} iterations", fuel);
                    } else {
                        println!("🔥 Debug fuel limit: unlimited");
                    }
                    println!("====================================================");
                }
                self.execute_nyash_file(filename);
            }
        }
    }
    pub(crate) fn execute_mir_module(&self, module: &crate::mir::MirModule) {
        use crate::backend::MirInterpreter;
        use crate::box_trait::{IntegerBox, BoolBox, StringBox};
        use crate::boxes::FloatBox;
        use crate::mir::MirType;

        let mut interp = MirInterpreter::new();
        match interp.execute_module(module) {
            Ok(result) => {
                println!("✅ MIR interpreter execution completed!");
                if let Some(func) = module.functions.get("main") {
                    let (ety, sval) = match &func.signature.return_type {
                        MirType::Float => {
                            if let Some(fb) = result.as_any().downcast_ref::<FloatBox>() {
                                ("Float", format!("{}", fb.value))
                            } else if let Some(ib) = result.as_any().downcast_ref::<IntegerBox>() {
                                ("Float", format!("{}", ib.value as f64))
                            } else { ("Float", result.to_string_box().value) }
                        }
                        MirType::Integer => {
                            if let Some(ib) = result.as_any().downcast_ref::<IntegerBox>() {
                                ("Integer", ib.value.to_string())
                            } else { ("Integer", result.to_string_box().value) }
                        }
                        MirType::Bool => {
                            if let Some(bb) = result.as_any().downcast_ref::<BoolBox>() {
                                ("Bool", bb.value.to_string())
                            } else if let Some(ib) = result.as_any().downcast_ref::<IntegerBox>() {
                                ("Bool", (ib.value != 0).to_string())
                            } else { ("Bool", result.to_string_box().value) }
                        }
                        MirType::String => {
                            if let Some(sb) = result.as_any().downcast_ref::<StringBox>() {
                                ("String", sb.value.clone())
                            } else { ("String", result.to_string_box().value) }
                        }
                        _ => { (result.type_name(), result.to_string_box().value) }
                    };
                    println!("ResultType(MIR): {}", ety);
                    println!("Result: {}", sval);
                } else {
                    println!("Result: {:?}", result);
                }
            }
            Err(e) => {
                eprintln!("❌ MIR interpreter error: {}", e);
                std::process::exit(1);
            }
        }
    }
}