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

use crate::expression::Expression;
use glib::translate::*;
use glib::{Type, Value};

glib::wrapper! {
    /// A `GObject` property value in a [`Expression`][crate::Expression].
    #[derive(Debug)]
    #[doc(alias = "GtkPropertyExpression")]
    pub struct PropertyExpression(Shared<ffi::GtkPropertyExpression>);

    match fn {
        ref => |ptr| ffi::gtk_expression_ref(ptr as *mut ffi::GtkExpression),
        unref => |ptr| ffi::gtk_expression_unref(ptr as *mut ffi::GtkExpression),
    }
}

define_expression!(
    PropertyExpression,
    ffi::GtkPropertyExpression,
    ffi::gtk_property_expression_get_type
);

impl PropertyExpression {
    /// Creates an expression that looks up a property.
    ///
    /// The object to use is found by evaluating the `expression`,
    /// or using the `this` argument when `expression` is `NULL`.
    ///
    /// If the resulting object conforms to `this_type`, its property named
    /// `property_name` will be queried. Otherwise, this expression's
    /// evaluation will fail.
    ///
    /// The given `this_type` must have a property with `property_name`.
    /// ## `this_type`
    /// The type to expect for the this type
    /// ## `expression`
    /// Expression to
    ///  evaluate to get the object to query or `NULL` to
    ///  query the `this` object
    /// ## `property_name`
    /// name of the property
    ///
    /// # Returns
    ///
    /// a new [`Expression`][crate::Expression]
    #[doc(alias = "gtk_property_expression_new")]
    pub fn new<E: AsRef<Expression>>(
        this_type: Type,
        expression: Option<&E>,
        property_name: &str,
    ) -> Self {
        assert_initialized_main_thread!();
        unsafe {
            from_glib_full(ffi::gtk_property_expression_new(
                this_type.into_glib(),
                expression.map(|e| e.as_ref()).to_glib_full(),
                property_name.to_glib_none().0,
            ))
        }
    }

    /// Creates an expression that looks up a property.
    ///
    /// The object to use is found by evaluating the `expression`,
    /// or using the `this` argument when `expression` is `NULL`.
    ///
    /// If the resulting object conforms to `this_type`, its
    /// property specified by `pspec` will be queried.
    /// Otherwise, this expression's evaluation will fail.
    /// ## `expression`
    /// Expression to
    ///  evaluate to get the object to query or `NULL` to
    ///  query the `this` object
    /// ## `pspec`
    /// the `GParamSpec` for the property to query
    ///
    /// # Returns
    ///
    /// a new [`Expression`][crate::Expression]
    #[doc(alias = "gtk_property_expression_new_for_pspec")]
    #[doc(alias = "new_for_pspec")]
    pub fn for_pspec<E: AsRef<Expression>>(expression: Option<&E>, pspec: glib::ParamSpec) -> Self {
        assert_initialized_main_thread!();
        unsafe {
            from_glib_full(ffi::gtk_property_expression_new_for_pspec(
                expression.map(|e| e.as_ref()).to_glib_full(),
                pspec.to_glib_none().0,
            ))
        }
    }

    /// Gets the expression specifying the object of
    /// a property expression.
    ///
    /// # Returns
    ///
    /// the object expression
    #[doc(alias = "gtk_property_expression_get_expression")]
    #[doc(alias = "get_expression")]
    pub fn expression(&self) -> Option<Expression> {
        assert_initialized_main_thread!();
        unsafe {
            from_glib_none(ffi::gtk_property_expression_get_expression(
                self.to_glib_none().0,
            ))
        }
    }

    /// Gets the `GParamSpec` specifying the property of
    /// a property expression.
    ///
    /// # Returns
    ///
    /// the `GParamSpec` for the property
    #[doc(alias = "gtk_property_expression_get_pspec")]
    #[doc(alias = "get_pspec")]
    pub fn pspec(&self) -> glib::ParamSpec {
        assert_initialized_main_thread!();
        unsafe {
            from_glib_none(ffi::gtk_property_expression_get_pspec(
                self.to_glib_none().0,
            ))
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::{test_synced, NONE_EXPRESSION};
    use glib::StaticType;

    #[test]
    fn test_property_expression() {
        test_synced(move || {
            let _prop_expr = PropertyExpression::new(
                crate::StringObject::static_type(),
                NONE_EXPRESSION,
                "string",
            );
        });
    }
}