// NOTE: These are estimated based on deno_runtime patterns.
// Actual API paths and method signatures should be verified
// against the specific version of deno_runtime being used.

use deno_runtime::permissions::PermissionsContainer;
use deno_runtime::worker::{MainWorker, WorkerOptions};
use deno_core::ModuleSpecifier;
use std::rc::Rc;

fn create_worker(
    main_module: ModuleSpecifier,
    permissions: PermissionsContainer,
) -> Result<MainWorker, AnyError> {
    // Permissions are typically set in WorkerOptions, not passed separately
    let options = WorkerOptions {
        module_loader: Rc::new(deno_runtime::deno_fs::FsModuleLoader),
        // Other required options will need to be configured
        ..Default::default()
    };
    
    // Actual constructor may vary - verify with deno_runtime docs
    MainWorker::bootstrap_from_options(main_module, options)
}

struct EmacsMainJsRuntime {
    tokio_runtime: Option<tokio::runtime::Runtime>,
    deno_worker: Option<MainWorker>,
    within_runtime: bool,
    module_counter: u64,
    stacked_v8_handle: Option<*mut v8::HandleScope<'static>>,
    options: EmacsJsOptions,
    proxy_template: Option<v8::Global<v8::ObjectTemplate>>,
    within_toplevel: bool,
    tick_scheduled: bool,
}

let permissions = Permissions::from_options(&flags.into());

// NOTE: The exact permissions API path may vary by version.
// Common patterns include:
// - deno_runtime::permissions::Permissions
// - deno_runtime::permissions::PermissionsContainer
// Verify the actual API in your version of deno_runtime

// For allow-all (typical pattern):
// let permissions = PermissionsContainer::allow_all();

// For custom permissions, the API typically involves:
// 1. Creating permission options/descriptors
// 2. Building a permissions container
// 
// Example pattern (verify against actual API):
// let permissions = PermissionsContainer::new(
//     Permissions {
//         net: NetPermissions::allow_all(),
//         read: ReadPermissions::allow_all(),
//         write: WritePermissions::allow_all(),
//         run: RunPermissions::allow_all(),
//         ..Default::default()
//     }
// );

use deno_core::{ModuleLoader, ModuleSource, ModuleSourceCode, ModuleType};
use std::pin::Pin;
use futures::future::Future;

struct EmacsModuleLoader {
    cached_modules: Arc<Mutex<HashMap<ModuleSpecifier, String>>>,
}

impl ModuleLoader for EmacsModuleLoader {
    fn resolve(
        &self,
        specifier: &str,
        referrer: &str,
        _kind: deno_core::ResolutionKind,
    ) -> Result<ModuleSpecifier, AnyError> {
        deno_core::resolve_import(specifier, referrer)
    }

    fn load(
        &self,
        module_specifier: &ModuleSpecifier,
        _maybe_referrer: Option<&ModuleSpecifier>,
        _is_dyn_import: bool,
        _requested_module_type: deno_core::RequestedModuleType,
    ) -> Pin<Box<dyn Future<Output = Result<ModuleSource, AnyError>>>> {
        let specifier = module_specifier.clone();
        let cached = self.cached_modules.clone();
        
        async move {
            // Check cache first
            if let Some(source) = cached.lock().unwrap().get(&specifier) {
                return Ok(ModuleSource::new(
                    ModuleType::JavaScript,
                    ModuleSourceCode::String(source.clone().into()),
                    &specifier,
                    None,
                ));
            }
            
            // Load from file system
            let path = specifier.to_file_path()
                .map_err(|_| anyhow::anyhow!("Invalid file path"))?;
            let source = tokio::fs::read_to_string(&path).await?;
            
            Ok(ModuleSource::new(
                ModuleType::JavaScript,
                ModuleSourceCode::String(source.into()),
                &specifier,
                None,
            ))
        }
        .boxed_local()
    }
}

worker.execute_module(&main_module).await?;
worker.run_event_loop().await?;

// Execute module
let mod_id = worker.preload_main_module(&main_module).await?;
worker.evaluate_module(mod_id).await?;

// Run event loop
worker.run_event_loop(false).await?;

// Old approach used execute_module with cached fake file
// New approach: direct script execution

let result = worker.execute_script(
    &format!("./$anon${}.js", counter),
    source_code.into(),
)?;

let runtime = &mut worker.js_runtime;
let context = runtime.global_context();
let scope = &mut v8::HandleScope::with_context(runtime.v8_isolate(), context);

let js_runtime = &mut worker.js_runtime;
let context = js_runtime.main_context();
let scope = &mut js_runtime.handle_scope();

pub(crate) fn v8_bind_lisp_funcs(
    worker: &mut MainWorker,
) -> Result<(), AnyError> {
    let js_runtime = &mut worker.js_runtime;
    let scope = &mut js_runtime.handle_scope();
    let context = scope.get_current_context();
    let global = context.global(scope);
    
    // Rest remains the same: bind functions to global object
    bind_global_fn!(scope, global, lisp_invoke);
    // ... other bindings
    
    // Execute preliminary JS
    js_runtime.execute_script("prelim.js", include_str!("prelim.js"))?;
    
    Ok(())
}

pub(crate) async fn eval_command(
    code: String,
    ext: String,
    print: bool,
) -> Result<(), AnyError> {
    let main_module = ModuleSpecifier::parse(&format!("file://github.com/./$deno$eval.{}", ext))?;
    let permissions = PermissionsContainer::allow_all();
    
    let source_code = if print {
        format!("console.log({})", code)
    } else {
        code
    };
    
    // Create module loader with cached code
    let module_loader = Rc::new(EmacsModuleLoader::new());
    module_loader.insert_cached(main_module.clone(), source_code);
    
    let options = WorkerOptions {
        module_loader,
        permissions: permissions.clone(),
        ..Default::default()
    };
    
    let mut worker = MainWorker::bootstrap_from_options(
        main_module.clone(),
        permissions,
        options,
    )?;
    
    // Bind lisp functions
    v8_bind_lisp_funcs(&mut worker)?;
    
    // Execute module
    let mod_id = worker.preload_main_module(&main_module).await?;
    worker.evaluate_module(mod_id).await?;
    worker.run_event_loop(false).await?;
    
    Ok(())
}

pub(crate) async fn run_repl() -> Result<(), AnyError> {
    // This requires deeper integration with Deno's REPL
    // May need to use deno_cli crate or implement custom REPL
    // For now, this is a placeholder showing the structure
    
    let main_module = ModuleSpecifier::parse("file://github.com/./$deno$repl.ts")?;
    let permissions = PermissionsContainer::allow_all();
    
    let options = WorkerOptions {
        // REPL-specific options
        ..Default::default()
    };
    
    let mut worker = MainWorker::bootstrap_from_options(
        main_module,
        permissions,
        options,
    )?;
    
    v8_bind_lisp_funcs(&mut worker)?;
    
    // REPL loop would go here
    // This is complex and may require deno_cli crate
    
    Ok(())
}

// NOTE: The deno_ast API evolves frequently. This is a general pattern.
// Verify the exact API against your version of deno_ast.

// Add to Cargo.toml:
// deno_ast = "0.42"  // Check for latest compatible version

// Example transpilation pattern:
use deno_ast::{MediaType, ParseParams, SourceTextInfo};

fn transpile_typescript(source: &str) -> Result<String, AnyError> {
    // The exact API varies by version. Common pattern:
    // 1. Parse the source with TypeScript media type
    // 2. Transpile to JavaScript
    // 3. Extract the transpiled text
    
    // Typical usage (verify against actual deno_ast version):
    // let parsed = deno_ast::parse_module(ParseParams {
    //     specifier: "file://github.com/module.ts".to_string(),
    //     text_info: SourceTextInfo::from_string(source.to_string()),
    //     media_type: MediaType::TypeScript,
    //     capture_tokens: false,
    //     scope_analysis: false,
    //     maybe_syntax: None,
    // })?;
    // 
    // let transpiled = parsed.transpile(&EmitOptions::default())?;
    // Ok(transpiled.text)
    
    // Simplified approach: Let the runtime handle it via module loader
    // by setting the correct MediaType
    unimplemented!("Check deno_ast documentation for current API")
}

// Worker options with TypeScript support
let options = WorkerOptions {
    // Enable TypeScript transpilation
    // This is handled automatically by the module loader in most cases
    ..Default::default()
};

#[derive(Clone)]
struct EmacsJsOptions {
    tick_rate: f64,
    permissions: PermissionsContainer,  // Changed from Option<Permissions>
    error_handler: LispObject,
    inspect: Option<String>,
    inspect_brk: Option<String>,
    use_color: bool,
    loops_per_tick: EmacsUint,
}

#[lisp_fn]
pub fn js_initialize(args: &[LispObject]) -> LispObject {
    let ops = permissions_from_args(args);
    EmacsMainJsRuntime::set_options(ops.clone());
    js_init_sys(&ops)
        .map(|_| emacs_sys::globals::Qt)
        .unwrap_or_else(|e| {
            error!("JS Failed to initialize with error: {}", e);
        })
}

fn js_init_sys(js_options: &EmacsJsOptions) -> Result<(), AnyError> {
    init_tokio()?;
    init_worker(js_options)?;
    Ok(())
}

fn init_worker(js_options: &EmacsJsOptions) -> Result<(), AnyError> {
    if EmacsMainJsRuntime::is_main_worker_active() {
        return Ok(());
    }
    
    let main_module = ModuleSpecifier::parse("file://github.com/init.js")?;
    let module_loader = Rc::new(EmacsModuleLoader::new());
    
    let options = WorkerOptions {
        module_loader,
        permissions: js_options.permissions.clone(),
        // Add inspector support if configured
        ..Default::default()
    };
    
    let mut worker = MainWorker::bootstrap_from_options(
        main_module,
        js_options.permissions.clone(),
        options,
    )?;
    
    v8_bind_lisp_funcs(&mut worker)?;
    EmacsMainJsRuntime::set_deno_worker(worker);
    
    Ok(())
}

#[cfg(test)]
mod tests {
    use super::*;
    
    #[tokio::test]
    async fn test_basic_eval() {
        let code = "1 + 1".to_string();
        let result = eval_command(code, "js".to_string(), true).await;
        assert!(result.is_ok());
    }
    
    #[tokio::test]
    async fn test_typescript_eval() {
        let code = "const x: number = 42; x".to_string();
        let result = eval_command(code, "ts".to_string(), false).await;
        assert!(result.is_ok());
    }
}