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// Copyright (C) 2017 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::translate::*;
use gobject_sys;
use gst_sys;

glib_wrapper! {
    /// Opaque structure.
    #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
    pub struct ParseContext(Boxed<gst_sys::GstParseContext>);

    match fn {
        copy => |ptr| {
            gobject_sys::g_boxed_copy(gst_sys::gst_parse_context_get_type(), ptr as *mut _) as *mut gst_sys::GstParseContext
        },
        free => |ptr| {
            gobject_sys::g_boxed_free(gst_sys::gst_parse_context_get_type(), ptr as *mut _)
        },
        get_type => || gst_sys::gst_parse_context_get_type(),
    }
}

unsafe impl Send for ParseContext {}
unsafe impl Sync for ParseContext {}

impl ParseContext {
    /// Allocates a parse context for use with `gst_parse_launch_full` or
    /// `gst_parse_launchv_full`.
    ///
    /// Free-function: gst_parse_context_free
    ///
    /// # Returns
    ///
    /// a newly-allocated parse context. Free
    ///  with `ParseContext::free` when no longer needed.
    pub fn new() -> Self {
        unsafe { from_glib_full(gst_sys::gst_parse_context_new()) }
    }

    /// Retrieve missing elements from a previous run of `gst_parse_launch_full`
    /// or `gst_parse_launchv_full`. Will only return results if an error code
    /// of `ParseError::NoSuchElement` was returned.
    ///
    /// # Returns
    ///
    /// a
    ///  `None`-terminated array of element factory name strings of missing
    ///  elements. Free with `g_strfreev` when no longer needed.
    pub fn get_missing_elements(&self) -> Vec<String> {
        unsafe {
            FromGlibPtrContainer::from_glib_full(gst_sys::gst_parse_context_get_missing_elements(
                mut_override(self.to_glib_none().0),
            ))
        }
    }
}

impl Default for ParseContext {
    fn default() -> Self {
        Self::new()
    }
}