use std::ops::Deref;

use crate::isolate::CxxIsolate;
use crate::isolate::LockedIsolate;
use crate::support::Opaque;
use crate::HandleScope;
use crate::Local;
use crate::Name;
use crate::Value;

/// A JavaScript object (ECMA-262, 4.3.3)
#[repr(C)]
pub struct Object(Opaque);

extern "C" {
  fn v8__Object__New(
    isolate: *mut CxxIsolate,
    prototype_or_null: *mut Value,
    names: *mut *mut Name,
    values: *mut *mut Value,
    length: usize,
  ) -> *mut Object;
  fn v8__Object__GetIsolate(object: &Object) -> &mut CxxIsolate;
}

impl Object {
  /// Creates a JavaScript object with the given properties, and
  /// a the given prototype_or_null (which can be any JavaScript
  /// value, and if it's null, the newly created object won't have
  /// a prototype at all). This is similar to Object.create().
  /// All properties will be created as enumerable, configurable
  /// and writable properties.
  pub fn new<'sc>(
    scope: &mut HandleScope<'sc>,
    mut prototype_or_null: Local<'sc, Value>,
    names: Vec<Local<'sc, Name>>,
    values: Vec<Local<'sc, Value>>,
    length: usize,
  ) -> Local<'sc, Object> {
    let mut names_: Vec<*mut Name> = vec![];
    for mut name in names {
      let n = &mut *name;
      names_.push(n);
    }

    let mut values_: Vec<*mut Value> = vec![];
    for mut value in values {
      let n = &mut *value;
      values_.push(n);
    }
    unsafe {
      Local::from_raw(v8__Object__New(
        scope.cxx_isolate(),
        &mut *prototype_or_null,
        names_.as_mut_ptr(),
        values_.as_mut_ptr(),
        length,
      ))
      .unwrap()
    }
  }

  /// Return the isolate to which the Object belongs to.
  pub fn get_isolate(&self) -> &mut CxxIsolate {
    unsafe { v8__Object__GetIsolate(self) }
  }
}

impl Deref for Object {
  type Target = Value;
  fn deref(&self) -> &Self::Target {
    unsafe { &*(self as *const _ as *const Value) }
  }
}