//! test262 宿主对象 `$262` 的最小绑定验证：对象存在、`global` 指向当前 realm
//! 全局、evalScript 可执行、未实现方法抛能力缺失错误。

use oxide_compiler::compiler::Compiler;
use oxide_parser::Allocator;
use oxide_vm::vm::Vm;

/// 单测辅助：源串 → 结果串（字符串值解包实际内容，运行错误以 `vm error: ...` 呈现）。
fn eval(source: &str) -> String {
    let allocator = Allocator::default();
    let program = match oxide_parser::parse(&allocator, source) {
        Ok(p) => p,
        Err(e) => return format!("parse error: {}", e[0].message),
    };
    let module = match Compiler::new().compile(&program) {
        Ok(m) => m,
        Err(e) => return format!("compile error: {e}"),
    };
    let mut vm = Vm::new();
    match vm.run(&module) {
        Ok(result) => vm.lookup_str(result).unwrap_or_else(|| format!("{result}")),
        Err(e) => format!("vm error: {e}"),
    }
}

/// `$262` 作为编译期已知全局绑定：typeof 为 object，`global` 即 globalThis。
#[test]
fn host_object_exists_and_exposes_global() {
    assert_eq!(eval("typeof $262"), "object");
    assert_eq!(eval("$262.global === globalThis"), "true");
}

/// `$262` 方法面：evalScript/gc 为可调用函数。
#[test]
fn host_methods_are_callable() {
    assert_eq!(eval("typeof $262.evalScript"), "function");
    assert_eq!(eval("typeof $262.gc"), "function");
    assert_eq!(eval("typeof $262.detachArrayBuffer"), "function");
    assert_eq!(eval("typeof $262.createRealm"), "function");
}

/// evalScript 执行脚本并返回显式 `return` 的完成值；无 return 为 undefined。
#[test]
fn eval_script_runs_code_and_returns_value() {
    assert_eq!(eval("$262.evalScript('return 40 + 2')"), "42");
    assert_eq!(eval("$262.evalScript('var y = 1; y')"), "undefined");
}

/// evalScript 编译失败转 SyntaxError（可由 JS catch 捕获）。
#[test]
fn eval_script_syntax_error_is_catchable() {
    let r = eval("try { $262.evalScript('if (') ; 'no-throw' } catch (e) { e.name }");
    assert_eq!(r, "SyntaxError");
}

/// 未实现方法抛能力缺失错误（消息带 `not supported`），不抛 ReferenceError。
#[test]
fn unsupported_methods_throw_not_supported() {
    let r =
        eval("try { $262.detachArrayBuffer(new ArrayBuffer(8)); 'no-throw' } catch (e) { e.name + ':' + e.message }");
    assert!(r.contains("TypeError"), "期望 TypeError，实际 {r}");
    assert!(r.contains("not supported"), "期望能力缺失消息，实际 {r}");

    let r = eval("try { $262.createRealm(); 'no-throw' } catch (e) { e.name + ':' + e.message }");
    assert!(r.contains("TypeError"), "期望 TypeError，实际 {r}");
    assert!(r.contains("not supported"), "期望能力缺失消息，实际 {r}");

    let r = eval("try { $262.agent(); 'no-throw' } catch (e) { e.name + ':' + e.message }");
    assert!(r.contains("TypeError"), "期望 TypeError，实际 {r}");
}

/// `$262.gc()` 触发一次 session 回收且不抛错。
#[test]
fn gc_runs_without_error() {
    assert_eq!(eval("$262.gc(); 'ok'"), "ok");
}