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

use std::marker::PhantomData;

use glib::{ParamSpec, Value, gobject_ffi, shared::Shared, translate::*};

use crate::{Expression, ParamSpecExpression, ffi, prelude::*};

impl HasParamSpec for Expression {
    type ParamSpec = ParamSpecExpression;

    type SetValue = Expression;

    type BuilderFn = for<'a> fn(&'a str) -> ParamSpecExpressionBuilder<'a>;

    fn param_spec_builder() -> Self::BuilderFn {
        Self::ParamSpec::builder
    }
}

impl std::fmt::Debug for ParamSpecExpression {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        f.write_str("ParamSpecExpression")
    }
}

impl std::ops::Deref for ParamSpecExpression {
    type Target = ParamSpec;

    #[inline]
    fn deref(&self) -> &Self::Target {
        unsafe { &*(self as *const ParamSpecExpression as *const ParamSpec) }
    }
}

unsafe impl glib::ParamSpecType for ParamSpecExpression {}

#[doc(hidden)]
impl<'a> ToGlibPtr<'a, *const gobject_ffi::GParamSpec> for ParamSpecExpression {
    type Storage = PhantomData<&'a Shared<ffi::GtkParamSpecExpression, ParamSpecExpression>>;

    #[inline]
    fn to_glib_none(&'a self) -> Stash<'a, *const gobject_ffi::GParamSpec, Self> {
        let stash = ToGlibPtr::<*const ffi::GtkParamSpecExpression>::to_glib_none(self);
        Stash(stash.0 as *const _, stash.1)
    }

    #[inline]
    fn to_glib_full(&self) -> *const gobject_ffi::GParamSpec {
        ToGlibPtr::<*const ffi::GtkParamSpecExpression>::to_glib_full(self) as *const _
    }
}

#[doc(hidden)]
impl<'a> ToGlibPtr<'a, *mut gobject_ffi::GParamSpec> for ParamSpecExpression {
    type Storage = PhantomData<&'a Shared<ffi::GtkParamSpecExpression, ParamSpecExpression>>;

    #[inline]
    fn to_glib_none(&'a self) -> Stash<'a, *mut gobject_ffi::GParamSpec, Self> {
        let stash = ToGlibPtr::<*mut ffi::GtkParamSpecExpression>::to_glib_none(self);
        Stash(stash.0 as *mut _, stash.1)
    }

    #[inline]
    fn to_glib_full(&self) -> *mut gobject_ffi::GParamSpec {
        ToGlibPtr::<*mut ffi::GtkParamSpecExpression>::to_glib_full(self) as *mut _
    }
}

#[doc(hidden)]
impl IntoGlibPtr<*mut gobject_ffi::GParamSpec> for ParamSpecExpression {
    #[inline]
    fn into_glib_ptr(self) -> *mut gobject_ffi::GParamSpec {
        let s = std::mem::ManuallyDrop::new(self);
        s.to_glib_none().0
    }
}

#[doc(hidden)]
impl IntoGlibPtr<*const gobject_ffi::GParamSpec> for ParamSpecExpression {
    #[inline]
    fn into_glib_ptr(self) -> *const gobject_ffi::GParamSpec {
        let s = std::mem::ManuallyDrop::new(self);
        s.to_glib_none().0
    }
}

#[doc(hidden)]
impl FromGlibPtrFull<*mut gobject_ffi::GParamSpec> for ParamSpecExpression {
    #[inline]
    unsafe fn from_glib_full(ptr: *mut gobject_ffi::GParamSpec) -> Self {
        unsafe { from_glib_full(ptr as *mut ffi::GtkParamSpecExpression) }
    }
}

impl ParamSpecExpression {
    #[allow(clippy::new_ret_no_self)]
    #[doc(alias = "gtk_param_spec_expression")]
    #[deprecated = "Use builder() instead"]
    pub fn new(
        name: impl IntoGStr,
        nick: impl IntoOptionalGStr,
        blurb: impl IntoOptionalGStr,
        flags: glib::ParamFlags,
    ) -> ParamSpec {
        assert_initialized_main_thread!();
        unsafe {
            name.run_with_gstr(|name| {
                nick.run_with_gstr(|nick| {
                    blurb.run_with_gstr(|blurb| {
                        from_glib_none(ffi::gtk_param_spec_expression(
                            name.as_ptr(),
                            nick.to_glib_none().0,
                            blurb.to_glib_none().0,
                            flags.into_glib(),
                        ))
                    })
                })
            })
        }
    }

    // rustdoc-stripper-ignore-next
    /// Creates a new builder-pattern struct instance to construct
    /// [`ParamSpecExpression`] objects.
    ///
    /// This method returns an instance of
    /// [`ParamSpecExpressionBuilder`](crate::builders::ParamSpecExpressionBuilder)
    /// which can be used to create [`ParamSpecExpression`] objects.
    pub fn builder(name: &str) -> ParamSpecExpressionBuilder<'_> {
        assert_initialized_main_thread!();
        ParamSpecExpressionBuilder::new(name)
    }

    pub fn upcast(self) -> ParamSpec {
        unsafe { from_glib_full(IntoGlibPtr::<*mut _>::into_glib_ptr(self)) }
    }

    pub fn upcast_ref(&self) -> &ParamSpec {
        self
    }
}

#[derive(Default)]
#[must_use]
// rustdoc-stripper-ignore-next
/// A [builder-pattern] type to construct [`ParamSpecExpression`] objects.
///
/// [builder-pattern]: https://doc.rust-lang.org/1.0.0/style/ownership/builders.html
pub struct ParamSpecExpressionBuilder<'a> {
    name: &'a str,
    nick: Option<&'a str>,
    blurb: Option<&'a str>,
    flags: glib::ParamFlags,
}

impl<'a> ParamSpecBuilderExt<'a> for ParamSpecExpressionBuilder<'a> {
    // rustdoc-stripper-ignore-next
    /// Default: `self.name`
    fn set_nick(&mut self, nick: Option<&'a str>) {
        self.nick = nick;
    }

    // rustdoc-stripper-ignore-next
    /// Default: `self.name`
    fn set_blurb(&mut self, blurb: Option<&'a str>) {
        self.blurb = blurb;
    }

    // rustdoc-stripper-ignore-next
    /// Default: `glib::ParamFlags::READWRITE`
    fn set_flags(&mut self, flags: glib::ParamFlags) {
        self.flags = flags;
    }

    // rustdoc-stripper-ignore-next
    /// Implementation detail.
    fn current_flags(&self) -> glib::ParamFlags {
        self.flags
    }
}

impl<'a> ParamSpecExpressionBuilder<'a> {
    fn new(name: &'a str) -> Self {
        assert_initialized_main_thread!();
        Self {
            name,
            ..Default::default()
        }
    }

    #[must_use]
    // rustdoc-stripper-ignore-next
    /// Build the [`ParamSpecExpression`].
    pub fn build(self) -> ParamSpec {
        ParamSpecExpression::new(self.name, self.nick, self.blurb, self.flags)
    }
}

#[doc(hidden)]
impl ValueType for ParamSpecExpression {
    type Type = ParamSpecExpression;
}

#[doc(hidden)]
impl glib::value::ValueTypeOptional for ParamSpecExpression {}

#[doc(hidden)]
unsafe impl<'a> glib::value::FromValue<'a> for ParamSpecExpression {
    type Checker = glib::value::GenericValueTypeOrNoneChecker<Self>;

    #[inline]
    unsafe fn from_value(value: &'a Value) -> Self {
        unsafe {
            let ptr = gobject_ffi::g_value_dup_param(value.to_glib_none().0);
            debug_assert!(!ptr.is_null());
            from_glib_full(ptr)
        }
    }
}

#[doc(hidden)]
impl ToValue for ParamSpecExpression {
    #[inline]
    fn to_value(&self) -> Value {
        unsafe {
            let mut value = Value::for_value_type::<Self>();
            gobject_ffi::g_value_take_param(
                value.to_glib_none_mut().0,
                ToGlibPtr::<*mut _>::to_glib_full(self) as *mut _,
            );
            value
        }
    }

    #[inline]
    fn value_type(&self) -> glib::Type {
        Self::static_type()
    }
}

#[doc(hidden)]
impl glib::value::ToValueOptional for ParamSpecExpression {
    #[inline]
    fn to_value_optional(s: Option<&Self>) -> Value {
        assert_initialized_main_thread!();
        let mut value = Value::for_value_type::<Self>();
        unsafe {
            gobject_ffi::g_value_take_param(
                value.to_glib_none_mut().0,
                ToGlibPtr::<*mut _>::to_glib_full(&s) as *mut _,
            );
        }

        value
    }
}

#[doc(hidden)]
impl From<ParamSpecExpression> for Value {
    fn from(s: ParamSpecExpression) -> Self {
        assert_initialized_main_thread!();
        unsafe {
            let mut value = Value::from_type(ParamSpecExpression::static_type());
            gobject_ffi::g_value_take_param(value.to_glib_none_mut().0, s.into_glib_ptr());
            value
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate as gtk4;

    #[test]
    fn paramspec_expression() {
        let pspec = ParamSpecExpression::new(
            "expression",
            None::<&str>,
            None::<&str>,
            glib::ParamFlags::CONSTRUCT_ONLY | glib::ParamFlags::READABLE,
        );

        let expr_pspec = pspec.downcast::<ParamSpecExpression>();
        assert!(expr_pspec.is_ok());
    }

    #[test]
    fn paramspec_expression_builder() {
        let pspec = ParamSpecExpression::builder("expression")
            .construct_only()
            .read_only()
            .build();

        assert_eq!(
            pspec.flags(),
            glib::ParamFlags::CONSTRUCT_ONLY | glib::ParamFlags::READABLE
        );
    }
}
