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

use glib::translate::*;

use crate::{DmabufTextureBuilder, Texture};

impl DmabufTextureBuilder {
    /// Builds a new [`Texture`][crate::Texture] with the values set up in the builder.
    ///
    /// It is a programming error to call this function if any mandatory property has not been set.
    ///
    /// Not all formats defined in the `drm_fourcc.h` header are supported. You can use
    /// [`DisplayExt::dmabuf_formats()`][crate::prelude::DisplayExt::dmabuf_formats()] to get a list of supported formats. If the
    /// format is not supported by GTK, [`None`] will be returned and @error will be set.
    ///
    /// The `destroy` function gets called when the returned texture gets released.
    ///
    /// It is the responsibility of the caller to keep the file descriptors for the planes
    /// open until the created texture is no longer used, and close them afterwards (possibly
    /// using the @destroy notify).
    ///
    /// It is possible to call this function multiple times to create multiple textures,
    /// possibly with changing properties in between.
    ///
    /// # Returns
    ///
    /// a newly built [`Texture`][crate::Texture] or `NULL`
    ///   if the format is not supported
    #[doc(alias = "gdk_dmabuf_texture_builder_build")]
    #[must_use = "The builder must be built to be used"]
    #[allow(clippy::missing_safety_doc)]
    pub unsafe fn build(self) -> Result<Texture, glib::Error> {
        let mut error = std::ptr::null_mut();

        let result = ffi::gdk_dmabuf_texture_builder_build(
            self.to_glib_none().0,
            None,
            std::ptr::null_mut(),
            &mut error,
        );
        if error.is_null() {
            if result.is_null() {
                Err(glib::Error::new(
                    crate::DmabufError::UnsupportedFormat,
                    "Unsupported format",
                ))
            } else {
                Ok(from_glib_full(result))
            }
        } else {
            Err(from_glib_full(error))
        }
    }

    #[doc(alias = "gdk_dmabuf_texture_builder_build")]
    #[must_use = "The builder must be built to be used"]
    #[allow(clippy::missing_safety_doc)]
    pub unsafe fn build_with_release_func<F: FnOnce() + Send + 'static>(
        self,
        release_func: F,
    ) -> Result<Texture, glib::Error> {
        let mut error = std::ptr::null_mut();
        unsafe extern "C" fn destroy_closure<F: FnOnce() + Send + 'static>(
            func: glib::ffi::gpointer,
        ) {
            let released_func = Box::<F>::from_raw(func as *mut _);
            released_func();
        }
        let released_func = Box::new(release_func);
        let result = ffi::gdk_dmabuf_texture_builder_build(
            self.to_glib_none().0,
            Some(destroy_closure::<F>),
            Box::into_raw(released_func) as glib::ffi::gpointer,
            &mut error,
        );
        if error.is_null() {
            if result.is_null() {
                Err(glib::Error::new(
                    crate::DmabufError::UnsupportedFormat,
                    "Unsupported format",
                ))
            } else {
                Ok(from_glib_full(result))
            }
        } else {
            Err(from_glib_full(error))
        }
    }
}