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

use std::ptr;

use glib::{prelude::*, translate::*};

use crate::{ffi, Buffer, BufferList, FlowError, FlowSuccess, Pad, ProxyPad};

impl ProxyPad {
    /// Invoke the default chain function of the proxy pad.
    /// ## `pad`
    /// a sink [`Pad`][crate::Pad], returns GST_FLOW_ERROR if not.
    /// ## `parent`
    /// the parent of `pad` or [`None`]
    /// ## `buffer`
    /// the [`Buffer`][crate::Buffer] to send, return GST_FLOW_ERROR
    ///  if not.
    ///
    /// # Returns
    ///
    /// a [`FlowReturn`][crate::FlowReturn] from the pad.
    #[doc(alias = "gst_proxy_pad_chain_default")]
    pub fn chain_default<O: IsA<ProxyPad>>(
        pad: &O,
        parent: Option<&impl IsA<crate::Object>>,
        buffer: Buffer,
    ) -> Result<FlowSuccess, FlowError> {
        skip_assert_initialized!();
        unsafe {
            try_from_glib(ffi::gst_proxy_pad_chain_default(
                pad.as_ptr() as *mut ffi::GstPad,
                parent.map(|p| p.as_ref()).to_glib_none().0,
                buffer.into_glib_ptr(),
            ))
        }
    }

    /// Invoke the default chain list function of the proxy pad.
    /// ## `pad`
    /// a sink [`Pad`][crate::Pad], returns GST_FLOW_ERROR if not.
    /// ## `parent`
    /// the parent of `pad` or [`None`]
    /// ## `list`
    /// the [`BufferList`][crate::BufferList] to send, return GST_FLOW_ERROR
    ///  if not.
    ///
    /// # Returns
    ///
    /// a [`FlowReturn`][crate::FlowReturn] from the pad.
    #[doc(alias = "gst_proxy_pad_chain_list_default")]
    pub fn chain_list_default<O: IsA<ProxyPad>>(
        pad: &O,
        parent: Option<&impl IsA<crate::Object>>,
        list: BufferList,
    ) -> Result<FlowSuccess, FlowError> {
        skip_assert_initialized!();
        unsafe {
            try_from_glib(ffi::gst_proxy_pad_chain_list_default(
                pad.as_ptr() as *mut ffi::GstPad,
                parent.map(|p| p.as_ref()).to_glib_none().0,
                list.into_glib_ptr(),
            ))
        }
    }

    /// Invoke the default getrange function of the proxy pad.
    /// ## `pad`
    /// a src [`Pad`][crate::Pad], returns [`FlowReturn::Error`][crate::FlowReturn::Error] if not.
    /// ## `parent`
    /// the parent of `pad`
    /// ## `offset`
    /// The start offset of the buffer
    /// ## `size`
    /// The length of the buffer
    ///
    /// # Returns
    ///
    /// a [`FlowReturn`][crate::FlowReturn] from the pad.
    ///
    /// ## `buffer`
    /// a pointer to hold the [`Buffer`][crate::Buffer],
    ///  returns [`FlowReturn::Error`][crate::FlowReturn::Error] if [`None`].
    #[doc(alias = "gst_proxy_pad_getrange_default")]
    pub fn getrange_default<O: IsA<ProxyPad>>(
        pad: &O,
        parent: Option<&impl IsA<crate::Object>>,
        offset: u64,
        size: u32,
    ) -> Result<Buffer, FlowError> {
        skip_assert_initialized!();
        unsafe {
            let mut buffer = ptr::null_mut();
            FlowSuccess::try_from_glib(ffi::gst_proxy_pad_getrange_default(
                pad.as_ptr() as *mut ffi::GstPad,
                parent.map(|p| p.as_ref()).to_glib_none().0,
                offset,
                size,
                &mut buffer,
            ))
            .map(|_| from_glib_full(buffer))
        }
    }

    /// Invoke the default iterate internal links function of the proxy pad.
    /// ## `pad`
    /// the [`Pad`][crate::Pad] to get the internal links of.
    /// ## `parent`
    /// the parent of `pad` or [`None`]
    ///
    /// # Returns
    ///
    /// a `GstIterator` of [`Pad`][crate::Pad], or [`None`] if `pad`
    /// has no parent. Unref each returned pad with `gst_object_unref()`.
    #[doc(alias = "gst_proxy_pad_iterate_internal_links_default")]
    pub fn iterate_internal_links_default<O: IsA<ProxyPad>>(
        pad: &O,
        parent: Option<&impl IsA<crate::Object>>,
    ) -> Option<crate::Iterator<Pad>> {
        skip_assert_initialized!();
        unsafe {
            from_glib_full(ffi::gst_proxy_pad_iterate_internal_links_default(
                pad.as_ptr() as *mut ffi::GstPad,
                parent.map(|p| p.as_ref()).to_glib_none().0,
            ))
        }
    }
}