use avril_core::{Error, Extension, ModuleLoader, ModuleSource, Runtime, RuntimeOptions};
use std::rc::Rc;

struct Loader;
impl ModuleLoader for Loader {
    fn resolve(&self, specifier: &str, referrer: &str) -> Result<String, Error> {
        Ok(if specifier == "private-alias" {
            "ext:core/ops".into()
        } else {
            format!("{referrer}/{specifier}")
        })
    }
    fn module_url(&self, name: &str) -> Option<String> {
        Some(format!("test:{name}"))
    }
    fn load(&self, name: &str) -> Result<ModuleSource, Error> {
        assert_eq!(name, "entry");
        Ok(r#"
            globalThis.resolved = import.meta.resolve('missing');
            try {import.meta.resolve('private-alias'); throw Error('Exposed extension');}
            catch (error) {if (!(error instanceof TypeError)) throw error;}
            if ('filename' in import.meta || 'dirname' in import.meta) throw Error('Non-file paths');
        "#.into())
    }
}

#[test]
fn embedding_resolvers_use_the_loader_without_loading_the_target() {
    let mut runtime = Runtime::new(RuntimeOptions {
        module_loader: Some(Rc::new(Loader)),
        ..Default::default()
    })
    .unwrap();
    runtime.execute_module("entry").unwrap();
    assert_eq!(
        runtime
            .execute_script::<String>("check", "resolved")
            .unwrap(),
        "test:entry/missing"
    );
}

#[test]
fn extension_metadata_resolves_embedded_specifiers_without_a_guest_loader() {
    let mut runtime = Runtime::new(RuntimeOptions {
        extensions: vec![Extension { dependencies: &[],name:"ext:metadata", ops:vec![], modules:&[("ext:metadata/main.js",r#"
            globalThis.resolved = [import.meta.resolve('./sub/../missing.js'),import.meta.resolve('ext:core/ops')];
            if ('filename' in import.meta || 'dirname' in import.meta) throw Error('Extension paths');
        "#)],entry_point:Some("ext:metadata/main.js")}], ..Default::default()
    }).unwrap();
    assert_eq!(
        runtime
            .execute_script::<Vec<String>>("check", "resolved")
            .unwrap(),
        ["ext:metadata/missing.js", "ext:core/ops"]
    );
}