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

use std::time::{Duration, SystemTime};

use glib::translate::*;

use super::Pixbuf;

glib::wrapper! {
    /// An opaque object representing an iterator which points to a
    /// certain position in an animation.
    #[doc(alias = "GdkPixbufAnimationIter")]
    pub struct PixbufAnimationIter(Object<ffi::GdkPixbufAnimationIter, ffi::GdkPixbufAnimationIterClass>);

    match fn {
        type_ => || ffi::gdk_pixbuf_animation_iter_get_type(),
    }
}

impl PixbufAnimationIter {
    /// Possibly advances an animation to a new frame.
    ///
    /// Chooses the frame based on the start time passed to
    /// gdk_pixbuf_animation_get_iter().
    ///
    /// @current_time would normally come from g_get_current_time(), and
    /// must be greater than or equal to the time passed to
    /// gdk_pixbuf_animation_get_iter(), and must increase or remain
    /// unchanged each time gdk_pixbuf_animation_iter_get_pixbuf() is
    /// called. That is, you can't go backward in time; animations only
    /// play forward.
    ///
    /// As a shortcut, pass `NULL` for the current time and g_get_current_time()
    /// will be invoked on your behalf. So you only need to explicitly pass
    /// @current_time if you're doing something odd like playing the animation
    /// at double speed.
    ///
    /// If this function returns `FALSE`, there's no need to update the animation
    /// display, assuming the display had been rendered prior to advancing;
    /// if `TRUE`, you need to call gdk_pixbuf_animation_iter_get_pixbuf()
    /// and update the display with the new pixbuf.
    /// ## `current_time`
    /// current time
    ///
    /// # Returns
    ///
    /// `TRUE` if the image may need updating
    #[doc(alias = "gdk_pixbuf_animation_iter_advance")]
    pub fn advance(&self, current_time: SystemTime) -> bool {
        let diff = current_time
            .duration_since(SystemTime::UNIX_EPOCH)
            .expect("failed to convert time");

        unsafe {
            from_glib(ffi::gdk_pixbuf_animation_iter_advance(
                self.to_glib_none().0,
                &glib::ffi::GTimeVal {
                    tv_sec: diff.as_secs() as _,
                    tv_usec: diff.subsec_micros() as _,
                },
            ))
        }
    }

    /// Gets the current pixbuf which should be displayed.
    ///
    /// The pixbuf might not be the same size as the animation itself
    /// (gdk_pixbuf_animation_get_width(), gdk_pixbuf_animation_get_height()).
    ///
    /// This pixbuf should be displayed for gdk_pixbuf_animation_iter_get_delay_time()
    /// milliseconds.
    ///
    /// The caller of this function does not own a reference to the returned
    /// pixbuf; the returned pixbuf will become invalid when the iterator
    /// advances to the next frame, which may happen anytime you call
    /// gdk_pixbuf_animation_iter_advance().
    ///
    /// Copy the pixbuf to keep it (don't just add a reference), as it may get
    /// recycled as you advance the iterator.
    ///
    /// # Returns
    ///
    /// the pixbuf to be displayed
    #[doc(alias = "gdk_pixbuf_animation_iter_get_pixbuf")]
    #[doc(alias = "get_pixbuf")]
    pub fn pixbuf(&self) -> Pixbuf {
        unsafe {
            from_glib_none(ffi::gdk_pixbuf_animation_iter_get_pixbuf(
                self.to_glib_none().0,
            ))
        }
    }

    /// Gets the number of milliseconds the current pixbuf should be displayed,
    /// or -1 if the current pixbuf should be displayed forever.
    ///
    /// The `g_timeout_add()` function conveniently takes a timeout in milliseconds,
    /// so you can use a timeout to schedule the next update.
    ///
    /// Note that some formats, like GIF, might clamp the timeout values in the
    /// image file to avoid updates that are just too quick. The minimum timeout
    /// for GIF images is currently 20 milliseconds.
    ///
    /// # Returns
    ///
    /// delay time in milliseconds (thousandths of a second)
    #[doc(alias = "gdk_pixbuf_animation_iter_get_delay_time")]
    #[doc(alias = "get_delay_time")]
    pub fn delay_time(&self) -> Option<Duration> {
        unsafe {
            let res = ffi::gdk_pixbuf_animation_iter_get_delay_time(self.to_glib_none().0);

            if res < 0 {
                None
            } else {
                Some(Duration::from_millis(res as u64))
            }
        }
    }

    /// Used to determine how to respond to the area_updated signal on
    /// #GdkPixbufLoader when loading an animation.
    ///
    /// The `::area_updated` signal is emitted for an area of the frame currently
    /// streaming in to the loader. So if you're on the currently loading frame,
    /// you will need to redraw the screen for the updated area.
    ///
    /// # Returns
    ///
    /// `TRUE` if the frame we're on is partially loaded, or the last frame
    #[doc(alias = "gdk_pixbuf_animation_iter_on_currently_loading_frame")]
    pub fn on_currently_loading_frame(&self) -> bool {
        unsafe {
            from_glib(ffi::gdk_pixbuf_animation_iter_on_currently_loading_frame(
                self.to_glib_none().0,
            ))
        }
    }
}