// Copyright (C) 2018 Sebastian Dröge <sebastian@centricular.com>
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use glib::object::IsA;
use glib::translate::*;
use gst;
use gst_base_sys;
use std::mem;
use std::ptr;

use BaseSrc;

pub trait BaseSrcExtManual: 'static {
    fn get_allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams);

    fn get_segment(&self) -> gst::Segment;

    fn start_complete(&self, ret: Result<gst::FlowSuccess, gst::FlowError>);

    fn start_wait(&self) -> Result<gst::FlowSuccess, gst::FlowError>;

    fn wait_playing(&self) -> Result<gst::FlowSuccess, gst::FlowError>;

    fn query_latency(&self) -> Result<(bool, gst::ClockTime, gst::ClockTime), glib::BoolError>;
}

impl<O: IsA<BaseSrc>> BaseSrcExtManual for O {
    fn get_allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams) {
        unsafe {
            let mut allocator = ptr::null_mut();
            let mut params = mem::zeroed();
            gst_base_sys::gst_base_src_get_allocator(
                self.as_ref().to_glib_none().0,
                &mut allocator,
                &mut params,
            );
            (from_glib_full(allocator), params.into())
        }
    }

    fn get_segment(&self) -> gst::Segment {
        unsafe {
            let src: &gst_base_sys::GstBaseSrc = &*(self.as_ptr() as *const _);
            let _guard = ::utils::MutexGuard::lock(&src.element.object.lock);
            from_glib_none(&src.segment as *const _)
        }
    }

    fn start_complete(&self, ret: Result<gst::FlowSuccess, gst::FlowError>) {
        let ret: gst::FlowReturn = ret.into();
        unsafe {
            gst_base_sys::gst_base_src_start_complete(
                self.as_ref().to_glib_none().0,
                ret.to_glib(),
            );
        }
    }

    fn start_wait(&self) -> Result<gst::FlowSuccess, gst::FlowError> {
        let ret: gst::FlowReturn = unsafe {
            from_glib(gst_base_sys::gst_base_src_start_wait(
                self.as_ref().to_glib_none().0,
            ))
        };
        ret.into_result()
    }

    fn wait_playing(&self) -> Result<gst::FlowSuccess, gst::FlowError> {
        let ret: gst::FlowReturn = unsafe {
            from_glib(gst_base_sys::gst_base_src_wait_playing(
                self.as_ref().to_glib_none().0,
            ))
        };
        ret.into_result()
    }

    fn query_latency(&self) -> Result<(bool, gst::ClockTime, 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(gst_base_sys::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"))
            }
        }
    }
}
