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// This file was generated by gir (https://github.com/gtk-rs/gir)
// from gir-files (https://github.com/gtk-rs/gir-files.git)
// from webkit2gtk-gir-files
// DO NOT EDIT

use crate::Value;
use glib::object::Cast;
use glib::object::IsA;
use glib::signal::connect_raw;
use glib::signal::SignalHandlerId;
use glib::translate::*;
use glib::StaticType;
use glib::ToValue;
use std::boxed::Box as Box_;
use std::fmt;
use std::mem::transmute;

glib::wrapper! {
    /// JSCWeakValue represents a weak reference to a value in a [`Context`][crate::Context]. It can be used
    /// to keep a reference to a JavaScript value without protecting it from being garbage
    /// collected and without referencing the [`Context`][crate::Context] either.
    ///
    /// # Implements
    ///
    /// [`WeakValueExt`][trait@crate::prelude::WeakValueExt]
    #[doc(alias = "JSCWeakValue")]
    pub struct WeakValue(Object<ffi::JSCWeakValue, ffi::JSCWeakValueClass>);

    match fn {
        type_ => || ffi::jsc_weak_value_get_type(),
    }
}

impl WeakValue {
    pub const NONE: Option<&'static WeakValue> = None;

    /// Create a new [`WeakValue`][crate::WeakValue] for the JavaScript value referenced by `value`.
    /// ## `value`
    /// a [`Value`][crate::Value]
    ///
    /// # Returns
    ///
    /// a new [`WeakValue`][crate::WeakValue]
    #[doc(alias = "jsc_weak_value_new")]
    pub fn new(value: &impl IsA<Value>) -> WeakValue {
        unsafe { from_glib_full(ffi::jsc_weak_value_new(value.as_ref().to_glib_none().0)) }
    }

    // rustdoc-stripper-ignore-next
    /// Creates a new builder-pattern struct instance to construct [`WeakValue`] objects.
    ///
    /// This method returns an instance of [`WeakValueBuilder`](crate::builders::WeakValueBuilder) which can be used to create [`WeakValue`] objects.
    pub fn builder() -> WeakValueBuilder {
        WeakValueBuilder::default()
    }
}

impl Default for WeakValue {
    fn default() -> Self {
        glib::object::Object::new::<Self>(&[])
    }
}

#[derive(Clone, Default)]
// rustdoc-stripper-ignore-next
/// A [builder-pattern] type to construct [`WeakValue`] objects.
///
/// [builder-pattern]: https://doc.rust-lang.org/1.0.0/style/ownership/builders.html
#[must_use = "The builder must be built to be used"]
pub struct WeakValueBuilder {
    value: Option<Value>,
}

impl WeakValueBuilder {
    // rustdoc-stripper-ignore-next
    /// Create a new [`WeakValueBuilder`].
    pub fn new() -> Self {
        Self::default()
    }

    // rustdoc-stripper-ignore-next
    /// Build the [`WeakValue`].
    #[must_use = "Building the object from the builder is usually expensive and is not expected to have side effects"]
    pub fn build(self) -> WeakValue {
        let mut properties: Vec<(&str, &dyn ToValue)> = vec![];
        if let Some(ref value) = self.value {
            properties.push(("value", value));
        }
        glib::Object::new::<WeakValue>(&properties)
    }

    /// The [`Value`][crate::Value] referencing the JavaScript value.
    pub fn value(mut self, value: &impl IsA<Value>) -> Self {
        self.value = Some(value.clone().upcast());
        self
    }
}

/// Trait containing all [`struct@WeakValue`] methods.
///
/// # Implementors
///
/// [`WeakValue`][struct@crate::WeakValue]
pub trait WeakValueExt: 'static {
    /// Get a [`Value`][crate::Value] referencing the JavaScript value of `self`.
    ///
    /// # Returns
    ///
    /// a new [`Value`][crate::Value] or [`None`] if `self` was cleared.
    #[doc(alias = "jsc_weak_value_get_value")]
    #[doc(alias = "get_value")]
    fn value(&self) -> Option<Value>;

    /// This signal is emitted when the JavaScript value is destroyed.
    #[doc(alias = "cleared")]
    fn connect_cleared<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId;
}

impl<O: IsA<WeakValue>> WeakValueExt for O {
    fn value(&self) -> Option<Value> {
        unsafe {
            from_glib_full(ffi::jsc_weak_value_get_value(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    fn connect_cleared<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn cleared_trampoline<P: IsA<WeakValue>, F: Fn(&P) + 'static>(
            this: *mut ffi::JSCWeakValue,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(WeakValue::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"cleared\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    cleared_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }
}

impl fmt::Display for WeakValue {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.write_str("WeakValue")
    }
}