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// This file was generated by gir (https://github.com/gtk-rs/gir)
// from gir-files (https://github.com/gtk-rs/gir-files)
// DO NOT EDIT

use ffi;
use glib;
use glib::object::IsA;
use glib::translate::*;
use glib_ffi;
use gobject_ffi;
use std;
use std::mem;
use std::ptr;

glib_wrapper! {
    /// This interface offers methods to query and manipulate parameter preset sets.
    /// A preset is a bunch of property settings, together with meta data and a name.
    /// The name of a preset serves as key for subsequent method calls to manipulate
    /// single presets.
    /// All instances of one type will share the list of presets. The list is created
    /// on demand, if presets are not used, the list is not created.
    ///
    /// The interface comes with a default implementation that serves most plugins.
    /// Wrapper plugins will override most methods to implement support for the
    /// native preset format of those wrapped plugins.
    /// One method that is useful to be overridden is `Preset::get_property_names`.
    /// With that one can control which properties are saved and in which order.
    /// When implementing support for read-only presets, one should set the vmethods
    /// for `Preset::save_preset` and `Preset::delete_preset` to `None`.
    /// Applications can use `Preset::is_editable` to check for that.
    ///
    /// The default implementation supports presets located in a system directory,
    /// application specific directory and in the users home directory. When getting
    /// a list of presets individual presets are read and overlaid in 1) system,
    /// 2) application and 3) user order. Whenever an earlier entry is newer, the
    /// later entries will be updated. Since 1.8 you can also provide extra paths
    /// where to find presets through the GST_PRESET_PATH environment variable.
    /// Presets found in those paths will be concidered as "app presets".
    ///
    /// # Implements
    ///
    /// [`PresetExt`](trait.PresetExt.html)
    pub struct Preset(Object<ffi::GstPreset, ffi::GstPresetInterface>);

    match fn {
        get_type => || ffi::gst_preset_get_type(),
    }
}

impl Preset {
    /// Gets the directory for application specific presets if set by the
    /// application.
    ///
    /// # Returns
    ///
    /// the directory or `None`, don't free or modify
    /// the string
    pub fn get_app_dir() -> Option<std::path::PathBuf> {
        assert_initialized_main_thread!();
        unsafe {
            from_glib_none(ffi::gst_preset_get_app_dir())
        }
    }

    /// Sets an extra directory as an absolute path that should be considered when
    /// looking for presets. Any presets in the application dir will shadow the
    /// system presets.
    /// ## `app_dir`
    /// the application specific preset dir
    ///
    /// # Returns
    ///
    /// `true` for success, `false` if the dir already has been set
    pub fn set_app_dir<P: AsRef<std::path::Path>>(app_dir: P) -> Result<(), glib::error::BoolError> {
        assert_initialized_main_thread!();
        unsafe {
            glib::error::BoolError::from_glib(ffi::gst_preset_set_app_dir(app_dir.as_ref().to_glib_none().0), "Failed to set app preset directory")
        }
    }
}

unsafe impl Send for Preset {}
unsafe impl Sync for Preset {}

/// Trait containing all `Preset` methods.
///
/// # Implementors
///
/// [`Preset`](struct.Preset.html)
pub trait PresetExt {
    /// Delete the given preset.
    /// ## `name`
    /// preset name to remove
    ///
    /// # Returns
    ///
    /// `true` for success, `false` if e.g. there is no preset with that `name`
    fn delete_preset(&self, name: &str) -> Result<(), glib::error::BoolError>;

    /// Gets the `value` for an existing meta data `tag`. Meta data `tag` names can be
    /// something like e.g. "comment". Returned values need to be released when done.
    /// ## `name`
    /// preset name
    /// ## `tag`
    /// meta data item name
    /// ## `value`
    /// value
    ///
    /// # Returns
    ///
    /// `true` for success, `false` if e.g. there is no preset with that `name`
    /// or no value for the given `tag`
    fn get_meta(&self, name: &str, tag: &str) -> Option<String>;

    /// Get a copy of preset names as a `None` terminated string array.
    ///
    /// # Returns
    ///
    ///
    ///  list with names, use `g_strfreev` after usage.
    fn get_preset_names(&self) -> Vec<String>;

    /// Get a the names of the GObject properties that can be used for presets.
    ///
    /// # Returns
    ///
    /// an
    ///  array of property names which should be freed with `g_strfreev` after use.
    fn get_property_names(&self) -> Vec<String>;

    /// Check if one can add new presets, change existing ones and remove presets.
    ///
    /// # Returns
    ///
    /// `true` if presets are editable or `false` if they are static
    fn is_editable(&self) -> bool;

    /// Load the given preset.
    /// ## `name`
    /// preset name to load
    ///
    /// # Returns
    ///
    /// `true` for success, `false` if e.g. there is no preset with that `name`
    fn load_preset(&self, name: &str) -> Result<(), glib::error::BoolError>;

    /// Renames a preset. If there is already a preset by the `new_name` it will be
    /// overwritten.
    /// ## `old_name`
    /// current preset name
    /// ## `new_name`
    /// new preset name
    ///
    /// # Returns
    ///
    /// `true` for success, `false` if e.g. there is no preset with `old_name`
    fn rename_preset(&self, old_name: &str, new_name: &str) -> Result<(), glib::error::BoolError>;

    /// Save the current object settings as a preset under the given name. If there
    /// is already a preset by this `name` it will be overwritten.
    /// ## `name`
    /// preset name to save
    ///
    /// # Returns
    ///
    /// `true` for success, `false`
    fn save_preset(&self, name: &str) -> Result<(), glib::error::BoolError>;

    /// Sets a new `value` for an existing meta data item or adds a new item. Meta
    /// data `tag` names can be something like e.g. "comment". Supplying `None` for the
    /// `value` will unset an existing value.
    /// ## `name`
    /// preset name
    /// ## `tag`
    /// meta data item name
    /// ## `value`
    /// new value
    ///
    /// # Returns
    ///
    /// `true` for success, `false` if e.g. there is no preset with that `name`
    fn set_meta<'a, P: Into<Option<&'a str>>>(&self, name: &str, tag: &str, value: P) -> Result<(), glib::error::BoolError>;
}

impl<O: IsA<Preset>> PresetExt for O {
    fn delete_preset(&self, name: &str) -> Result<(), glib::error::BoolError> {
        unsafe {
            glib::error::BoolError::from_glib(ffi::gst_preset_delete_preset(self.to_glib_none().0, name.to_glib_none().0), "Failed to delete preset")
        }
    }

    fn get_meta(&self, name: &str, tag: &str) -> Option<String> {
        unsafe {
            let mut value = ptr::null_mut();
            let ret = from_glib(ffi::gst_preset_get_meta(self.to_glib_none().0, name.to_glib_none().0, tag.to_glib_none().0, &mut value));
            if ret { Some(from_glib_full(value)) } else { None }
        }
    }

    fn get_preset_names(&self) -> Vec<String> {
        unsafe {
            FromGlibPtrContainer::from_glib_full(ffi::gst_preset_get_preset_names(self.to_glib_none().0))
        }
    }

    fn get_property_names(&self) -> Vec<String> {
        unsafe {
            FromGlibPtrContainer::from_glib_full(ffi::gst_preset_get_property_names(self.to_glib_none().0))
        }
    }

    fn is_editable(&self) -> bool {
        unsafe {
            from_glib(ffi::gst_preset_is_editable(self.to_glib_none().0))
        }
    }

    fn load_preset(&self, name: &str) -> Result<(), glib::error::BoolError> {
        unsafe {
            glib::error::BoolError::from_glib(ffi::gst_preset_load_preset(self.to_glib_none().0, name.to_glib_none().0), "Failed to load preset")
        }
    }

    fn rename_preset(&self, old_name: &str, new_name: &str) -> Result<(), glib::error::BoolError> {
        unsafe {
            glib::error::BoolError::from_glib(ffi::gst_preset_rename_preset(self.to_glib_none().0, old_name.to_glib_none().0, new_name.to_glib_none().0), "Failed to rename preset")
        }
    }

    fn save_preset(&self, name: &str) -> Result<(), glib::error::BoolError> {
        unsafe {
            glib::error::BoolError::from_glib(ffi::gst_preset_save_preset(self.to_glib_none().0, name.to_glib_none().0), "Failed to save preset")
        }
    }

    fn set_meta<'a, P: Into<Option<&'a str>>>(&self, name: &str, tag: &str, value: P) -> Result<(), glib::error::BoolError> {
        let value = value.into();
        let value = value.to_glib_none();
        unsafe {
            glib::error::BoolError::from_glib(ffi::gst_preset_set_meta(self.to_glib_none().0, name.to_glib_none().0, tag.to_glib_none().0, value.0), "Failed to set preset meta")
        }
    }
}