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// Take a look at the license at the top of the repository in the LICENSE file.

use crate::ChildProxy;
use glib::prelude::*;
use glib::translate::*;
use std::ptr;

pub trait ChildProxyExtManual: 'static {
    /// Looks up which object and `GParamSpec` would be effected by the given `name`.
    /// ## `name`
    /// name of the property to look up
    ///
    /// # Returns
    ///
    /// [`true`] if `target` and `pspec` could be found. [`false`] otherwise. In that
    /// case the values for `pspec` and `target` are not modified. Unref `target` after
    /// usage. For plain [`glib::Object`][crate::glib::Object] `target` is the same as `self`.
    ///
    /// ## `target`
    /// pointer to a [`glib::Object`][crate::glib::Object] that
    ///  takes the real object to set property on
    ///
    /// ## `pspec`
    /// pointer to take the `GParamSpec`
    ///  describing the property
    #[doc(alias = "gst_child_proxy_lookup")]
    fn lookup(&self, name: &str) -> Result<(glib::Object, glib::ParamSpec), glib::BoolError>;

    /// Gets a single property using the GstChildProxy mechanism.
    /// You are responsible for freeing it by calling [`glib::Value::unset()`][crate::glib::Value::unset()]
    /// ## `name`
    /// name of the property
    ///
    /// # Returns
    ///
    ///
    /// ## `value`
    /// a [`glib::Value`][crate::glib::Value] that should take the result.
    #[doc(alias = "get_child_property")]
    #[doc(alias = "gst_child_proxy_get")]
    fn child_property<V: for<'b> glib::value::FromValue<'b> + 'static>(&self, name: &str) -> V;
    #[doc(alias = "get_child_property")]
    #[doc(alias = "gst_child_proxy_get")]
    fn child_property_value(&self, name: &str) -> glib::Value;

    /// Sets a single property using the GstChildProxy mechanism.
    /// ## `name`
    /// name of the property to set
    /// ## `value`
    /// new [`glib::Value`][crate::glib::Value] for the property
    #[doc(alias = "gst_child_proxy_set")]
    fn set_child_property<V: glib::ToValue>(&self, name: &str, value: V);
    #[doc(alias = "gst_child_proxy_set_property")]
    fn set_child_property_from_value(&self, name: &str, value: &glib::Value);
}

impl<O: IsA<ChildProxy>> ChildProxyExtManual for O {
    fn lookup(&self, name: &str) -> Result<(glib::Object, glib::ParamSpec), glib::BoolError> {
        unsafe {
            let mut target = ptr::null_mut();
            let mut pspec = ptr::null_mut();
            let ret = from_glib(ffi::gst_child_proxy_lookup(
                self.as_ref().to_glib_none().0,
                name.to_glib_none().0,
                &mut target,
                &mut pspec,
            ));
            if ret {
                Ok((from_glib_full(target), from_glib_none(pspec)))
            } else {
                Err(glib::bool_error!("Failed to find child property"))
            }
        }
    }

    #[track_caller]
    fn child_property<V: for<'b> glib::value::FromValue<'b> + 'static>(&self, name: &str) -> V {
        let (child, pspec) = self.lookup(name).unwrap();
        child.property(pspec.name())
    }

    #[track_caller]
    fn child_property_value(&self, name: &str) -> glib::Value {
        let (child, pspec) = self.lookup(name).unwrap();
        child.property_value(pspec.name())
    }

    #[track_caller]
    fn set_child_property<V: glib::ToValue>(&self, name: &str, value: V) {
        let (child, pspec) = self.lookup(name).unwrap();
        child.set_property(pspec.name(), value)
    }

    #[track_caller]
    fn set_child_property_from_value(&self, name: &str, value: &glib::Value) {
        let (child, pspec) = self.lookup(name).unwrap();
        child.set_property_from_value(pspec.name(), value)
    }
}