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

use std::{boxed::Box as Box_, mem::transmute};

use glib::{
    object::ObjectType,
    signal::{connect_raw, SignalHandlerId},
    translate::*,
};

use crate::{ffi, Player};

impl Player {
    /// Get a copy of the current configuration of the player. This configuration
    /// can either be modified and used for the [`set_config()`][Self::set_config()] call
    /// or it must be freed after usage.
    ///
    /// # Returns
    ///
    /// a copy of the current configuration of `self`. Use
    /// `gst_structure_free()` after usage or [`set_config()`][Self::set_config()].
    #[doc(alias = "get_config")]
    #[doc(alias = "gst_player_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 [`gst::Structure`][crate::gst::Structure] that contains the configuration parameters for
    /// the player.
    ///
    /// This function takes ownership of `config`.
    /// ## `config`
    /// a [`gst::Structure`][crate::gst::Structure]
    ///
    /// # Returns
    ///
    /// [`true`] when the configuration could be set.
    #[doc(alias = "gst_player_set_config")]
    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_glib_ptr()),
                "Failed to set config",
            )
        }
    }

    pub fn connect_duration_changed<F: Fn(&Player, Option<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::<*const (), unsafe extern "C" fn()>(
                    duration_changed_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    pub fn connect_position_updated<F: Fn(&Player, Option<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::<*const (), 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::<*const (), unsafe extern "C" fn()>(
                    seek_done_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    /// Get a snapshot of the currently selected video stream, if any. The format can be
    /// selected with `format` and optional configuration is possible with `config`
    /// Currently supported settings are:
    /// - width, height of type G_TYPE_INT
    /// - pixel-aspect-ratio of type GST_TYPE_FRACTION
    ///  Except for GST_PLAYER_THUMBNAIL_RAW_NATIVE format, if no config is set, pixel-aspect-ratio would be 1/1
    /// ## `format`
    /// output format of the video snapshot
    /// ## `config`
    /// Additional configuration
    ///
    /// # Returns
    ///
    /// Current video snapshot sample or [`None`] on failure
    #[doc(alias = "gst_player_get_video_snapshot")]
    #[doc(alias = "get_video_snapshot")]
    pub fn video_snapshot(
        &self,
        format: crate::PlayerSnapshotFormat,
        config: Option<&gst::StructureRef>,
    ) -> Option<gst::Sample> {
        unsafe {
            from_glib_full(ffi::gst_player_get_video_snapshot(
                self.to_glib_none().0,
                format.into_glib(),
                mut_override(config.map(|c| c.as_ptr()).unwrap_or(std::ptr::null())),
            ))
        }
    }
}

impl Default for Player {
    fn default() -> Self {
        Self::new(
            None::<crate::PlayerVideoRenderer>,
            None::<crate::PlayerSignalDispatcher>,
        )
    }
}

unsafe extern "C" fn duration_changed_trampoline<
    F: Fn(&Player, Option<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), FromGlib::from_glib(object))
}

unsafe extern "C" fn position_updated_trampoline<
    F: Fn(&Player, Option<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), FromGlib::from_glib(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),
        try_from_glib(object).expect("undefined seek position"),
    )
}