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

use crate::Player;
use crate::PlayerSignalDispatcher;
use crate::PlayerVideoRenderer;
use glib::object::ObjectType;
use glib::signal::connect_raw;
use glib::signal::SignalHandlerId;
use glib::translate::*;
use std::boxed::Box as Box_;
use std::mem::transmute;

impl Player {
    /// Creates a new [`crate::Player`] instance that uses `signal_dispatcher` to dispatch
    /// signals to some event loop system, or emits signals directly if NULL is
    /// passed. See [`crate::PlayerGMainContextSignalDispatcher::new()`].
    ///
    /// Video is going to be rendered by `video_renderer`, or if [`None`] is provided
    /// no special video set up will be done and some default handling will be
    /// performed.
    /// ## `video_renderer`
    /// GstPlayerVideoRenderer to use
    /// ## `signal_dispatcher`
    /// GstPlayerSignalDispatcher to use
    ///
    /// # Returns
    ///
    /// a new [`crate::Player`] instance
    pub fn new(
        video_renderer: Option<&PlayerVideoRenderer>,
        signal_dispatcher: Option<&PlayerSignalDispatcher>,
    ) -> Player {
        assert_initialized_main_thread!();
        let video_renderer = video_renderer.to_glib_full();
        let signal_dispatcher = signal_dispatcher.to_glib_full();

        let (major, minor, _, _) = gst::version();
        if (major, minor) > (1, 12) {
            unsafe { from_glib_full(ffi::gst_player_new(video_renderer, signal_dispatcher)) }
        } else {
            // Workaround for bad floating reference handling in 1.12. This issue was fixed for 1.13 in
            // https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/commit/gst-libs/gst/player/gstplayer.c?id=634cd87c76f58b5e1383715bafd5614db825c7d1
            unsafe { from_glib_none(ffi::gst_player_new(video_renderer, signal_dispatcher)) }
        }
    }

    /// Get a copy of the current configuration of the player. This configuration
    /// can either be modified and used for the [`Self::set_config()`] call
    /// or it must be freed after usage.
    ///
    /// # Returns
    ///
    /// a copy of the current configuration of `self`. Use
    /// [`crate::gst::Structure::free()`] after usage or [`Self::set_config()`].
    #[doc(alias = "get_config")]
    pub fn config(&self) -> crate::PlayerConfig {
        unsafe { from_glib_full(ffi::gst_player_get_config(self.to_glib_none().0)) }
    }

    /// Set the configuration of the player. If the player is already configured, and
    /// the configuration haven't change, this function will return [`true`]. If the
    /// player is not in the GST_PLAYER_STATE_STOPPED, this method will return [`false`]
    /// and active configuration will remain.
    ///
    /// `config` is a [`crate::gst::Structure`] that contains the configuration parameters for
    /// the player.
    ///
    /// This function takes ownership of `config`.
    /// ## `config`
    /// a [`crate::gst::Structure`]
    ///
    /// # Returns
    ///
    /// [`true`] when the configuration could be set.
    pub fn set_config(&self, config: crate::PlayerConfig) -> Result<(), glib::error::BoolError> {
        unsafe {
            glib::result_from_gboolean!(
                ffi::gst_player_set_config(self.to_glib_none().0, config.into_ptr()),
                "Failed to set config",
            )
        }
    }

    pub fn connect_duration_changed<F: Fn(&Player, gst::ClockTime) + Send + 'static>(
        &self,
        f: F,
    ) -> SignalHandlerId {
        #[allow(clippy::cast_ptr_alignment)]
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"duration-changed\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    duration_changed_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    pub fn connect_position_updated<F: Fn(&Player, gst::ClockTime) + Send + 'static>(
        &self,
        f: F,
    ) -> SignalHandlerId {
        #[allow(clippy::cast_ptr_alignment)]
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"position-updated\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    position_updated_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    pub fn connect_seek_done<F: Fn(&Player, gst::ClockTime) + Send + 'static>(
        &self,
        f: F,
    ) -> SignalHandlerId {
        #[allow(clippy::cast_ptr_alignment)]
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"seek-done\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    seek_done_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }
}

unsafe extern "C" fn duration_changed_trampoline<
    F: Fn(&Player, gst::ClockTime) + Send + 'static,
>(
    this: *mut ffi::GstPlayer,
    object: u64,
    f: glib::ffi::gpointer,
) {
    let f: &F = &*(f as *const F);
    f(&from_glib_borrow(this), gst::ClockTime(Some(object)))
}

unsafe extern "C" fn position_updated_trampoline<
    F: Fn(&Player, gst::ClockTime) + Send + 'static,
>(
    this: *mut ffi::GstPlayer,
    object: u64,
    f: glib::ffi::gpointer,
) {
    let f: &F = &*(f as *const F);
    f(&from_glib_borrow(this), gst::ClockTime(Some(object)))
}

unsafe extern "C" fn seek_done_trampoline<F: Fn(&Player, gst::ClockTime) + Send + 'static>(
    this: *mut ffi::GstPlayer,
    object: u64,
    f: glib::ffi::gpointer,
) {
    let f: &F = &*(f as *const F);
    f(&from_glib_borrow(this), gst::ClockTime(Some(object)))
}