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

use std::{mem, ptr};

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

use crate::{ffi, BaseSrc};

mod sealed {
    pub trait Sealed {}
    impl<T: super::IsA<super::BaseSrc>> Sealed for T {}
}

pub trait BaseSrcExtManual: sealed::Sealed + IsA<BaseSrc> + 'static {
    /// Lets [`BaseSrc`][crate::BaseSrc] sub-classes to know the memory `allocator`
    /// used by the base class and its `params`.
    ///
    /// Unref the `allocator` after usage.
    ///
    /// # Returns
    ///
    ///
    /// ## `allocator`
    /// the [`gst::Allocator`][crate::gst::Allocator]
    /// used
    ///
    /// ## `params`
    /// the [`gst::AllocationParams`][crate::gst::AllocationParams] of `allocator`
    #[doc(alias = "get_allocator")]
    #[doc(alias = "gst_base_src_get_allocator")]
    fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams) {
        unsafe {
            let mut allocator = ptr::null_mut();
            let mut params = mem::MaybeUninit::uninit();
            ffi::gst_base_src_get_allocator(
                self.as_ref().to_glib_none().0,
                &mut allocator,
                params.as_mut_ptr(),
            );
            (from_glib_full(allocator), params.assume_init().into())
        }
    }

    #[doc(alias = "get_segment")]
    fn segment(&self) -> gst::Segment {
        unsafe {
            let src: &ffi::GstBaseSrc = &*(self.as_ptr() as *const _);
            let srcpad = self.src_pad();
            let _guard = srcpad.stream_lock();
            let _guard = self.as_ref().object_lock();
            from_glib_none(&src.segment as *const _)
        }
    }

    /// Query the source for the latency parameters. `live` will be [`true`] when `self` is
    /// configured as a live source. `min_latency` and `max_latency` will be set
    /// to the difference between the running time and the timestamp of the first
    /// buffer.
    ///
    /// This function is mostly used by subclasses.
    ///
    /// # Returns
    ///
    /// [`true`] if the query succeeded.
    ///
    /// ## `live`
    /// if the source is live
    ///
    /// ## `min_latency`
    /// the min latency of the source
    ///
    /// ## `max_latency`
    /// the max latency of the source
    #[doc(alias = "gst_base_src_query_latency")]
    fn query_latency(
        &self,
    ) -> Result<(bool, Option<gst::ClockTime>, Option<gst::ClockTime>), glib::BoolError> {
        unsafe {
            let mut live = mem::MaybeUninit::uninit();
            let mut min_latency = mem::MaybeUninit::uninit();
            let mut max_latency = mem::MaybeUninit::uninit();
            let ret = from_glib(ffi::gst_base_src_query_latency(
                self.as_ref().to_glib_none().0,
                live.as_mut_ptr(),
                min_latency.as_mut_ptr(),
                max_latency.as_mut_ptr(),
            ));
            let live = live.assume_init();
            let min_latency = min_latency.assume_init();
            let max_latency = max_latency.assume_init();
            if ret {
                Ok((
                    from_glib(live),
                    from_glib(min_latency),
                    from_glib(max_latency),
                ))
            } else {
                Err(glib::bool_error!("Failed to query latency"))
            }
        }
    }

    fn src_pad(&self) -> &gst::Pad {
        unsafe {
            let elt = &*(self.as_ptr() as *const ffi::GstBaseSrc);
            &*(&elt.srcpad as *const *mut gst::ffi::GstPad as *const gst::Pad)
        }
    }
}

impl<O: IsA<BaseSrc>> BaseSrcExtManual for O {}