///
/// This example demonstrates extending Runtime to inline your own extensions and modules
/// as well as enforce values for the Runtime's options
///
/// This example creates a runtime which will timeout after 0.5s, imports an exension,
/// And ensures that a preset module is always available for import.
///
/// Extensions like the one being used (see examples/ext/example_extension.rs)
/// allow you to call rust code from within JS
///
/// Extensions consist of a set of #[op2] functions, an extension! macro,
/// and one or more optional JS modules.
///
use rustyscript::{module, Error, Module, ModuleHandle, Runtime, RuntimeOptions};
use std::time::Duration;

// See example_extension for a demonstration
// of creating a deno_core extension for the runtime
mod example_extension;

// A module that will always be loaded into the custom runtime
const MY_MODULE: Module = module!(
    "my_module.js",
    "export function importantFunction() {
        return 42;
    }"
);

/// A runtime which will timeout after 0.5s, imports an exension,
/// And ensures that a preset module is always available for import.
pub struct MyRuntime(Runtime);
impl MyRuntime {
    /// Create a new instance of the runtime
    pub fn new() -> Result<Self, Error> {
        let mut runtime = Self(Runtime::new(RuntimeOptions {
            extensions: vec![example_extension::example_extension::init_ops_and_esm()],
            timeout: Duration::from_millis(500),
            ..Default::default()
        })?);
        runtime.load_module(&MY_MODULE)?;

        Ok(runtime)
    }

    /// Calls a javascript function within the Deno runtime by its name and deserializes its return value.
    ///
    /// # Arguments
    /// * `name` - A string representing the name of the javascript function to call.
    pub fn call_function<T>(
        &mut self,
        module_context: &ModuleHandle,
        name: &str,
        args: &impl serde::ser::Serialize,
    ) -> Result<T, Error>
    where
        T: deno_core::serde::de::DeserializeOwned,
    {
        self.0.call_function(Some(module_context), name, args)
    }

    /// Get a value from a runtime instance
    ///
    /// # Arguments
    /// * `name` - A string representing the name of the value to find
    pub fn get_value<T>(&mut self, module_context: &ModuleHandle, name: &str) -> Result<T, Error>
    where
        T: serde::de::DeserializeOwned,
    {
        self.0.get_value(Some(module_context), name)
    }

    /// Executes the given module, and returns a handle allowing you to extract values
    /// And call functions
    ///
    /// # Arguments
    /// * `module` - A `Module` object containing the module's filename and contents.
    pub fn load_module(&mut self, module: &Module) -> Result<ModuleHandle, Error> {
        self.0.load_module(module)
    }
}

fn main() -> Result<(), Error> {
    let module = Module::new(
        "test.js",
        "
        import * as myModule from './my_module.js';
        export const value = myModule.importantFunction();
        ",
    );

    let mut runtime = MyRuntime::new()?;
    let module_context = runtime.load_module(&module)?;
    let value: i32 = runtime.get_value(&module_context, "value")?;
    assert_eq!(42, value);

    Ok(())
}