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

use crate::{Builder, Widget};
use glib::prelude::*;
use glib::translate::*;
use glib::GString;
use glib::Object;
use std::path::Path;
use std::ptr;

impl Builder {
    #[doc(alias = "gtk_builder_new_from_file")]
    pub fn from_file<T: AsRef<Path>>(file_path: T) -> Builder {
        assert_initialized_main_thread!();
        unsafe {
            from_glib_full(ffi::gtk_builder_new_from_file(
                file_path.as_ref().to_glib_none().0,
            ))
        }
    }
}

pub trait BuilderExtManual: 'static {
    #[doc(alias = "gtk_builder_get_object")]
    #[doc(alias = "get_object")]
    fn object<T: IsA<Object>>(&self, name: &str) -> Option<T>;

    #[doc(alias = "gtk_builder_add_from_file")]
    fn add_from_file<T: AsRef<Path>>(&self, file_path: T) -> Result<(), glib::Error>;
    /// Parses a resource file containing a [GtkBuilder UI definition][BUILDER-UI]
    /// and merges it with the current contents of `self`.
    ///
    /// Most users will probably want to use [`Builder::from_resource()`][crate::Builder::from_resource()].
    ///
    /// If an error occurs, 0 will be returned and `error` will be assigned a
    /// [`glib::Error`][crate::glib::Error] from the `GTK_BUILDER_ERROR`, `G_MARKUP_ERROR` or `G_RESOURCE_ERROR`
    /// domain.
    ///
    /// It’s not really reasonable to attempt to handle failures of this
    /// call. The only reasonable thing to do when an error is detected is
    /// to call `g_error()`.
    /// ## `resource_path`
    /// the path of the resource file to parse
    ///
    /// # Returns
    ///
    /// A positive value on success, 0 if an error occurred
    #[doc(alias = "gtk_builder_add_from_resource")]
    fn add_from_resource(&self, resource_path: &str) -> Result<(), glib::Error>;
    /// Parses a string containing a [GtkBuilder UI definition][BUILDER-UI]
    /// and merges it with the current contents of `self`.
    ///
    /// Most users will probably want to use [`Builder::from_string()`][crate::Builder::from_string()].
    ///
    /// Upon errors 0 will be returned and `error` will be assigned a
    /// [`glib::Error`][crate::glib::Error] from the `GTK_BUILDER_ERROR`, `G_MARKUP_ERROR` or
    /// `G_VARIANT_PARSE_ERROR` domain.
    ///
    /// It’s not really reasonable to attempt to handle failures of this
    /// call. The only reasonable thing to do when an error is detected is
    /// to call `g_error()`.
    /// ## `buffer`
    /// the string to parse
    /// ## `length`
    /// the length of `buffer` (may be -1 if `buffer` is nul-terminated)
    ///
    /// # Returns
    ///
    /// A positive value on success, 0 if an error occurred
    #[doc(alias = "gtk_builder_add_from_string")]
    fn add_from_string(&self, buffer: &str) -> Result<(), glib::Error>;

    /// Parses a resource file containing a [GtkBuilder UI definition][BUILDER-UI]
    /// building only the requested objects and merges
    /// them with the current contents of `self`.
    ///
    /// Upon errors 0 will be returned and `error` will be assigned a
    /// [`glib::Error`][crate::glib::Error] from the `GTK_BUILDER_ERROR`, `G_MARKUP_ERROR` or `G_RESOURCE_ERROR`
    /// domain.
    ///
    /// If you are adding an object that depends on an object that is not
    /// its child (for instance a [`TreeView`][crate::TreeView] that depends on its
    /// [`TreeModel`][crate::TreeModel]), you have to explicitly list all of them in `object_ids`.
    /// ## `resource_path`
    /// the path of the resource file to parse
    /// ## `object_ids`
    /// nul-terminated array of objects to build
    ///
    /// # Returns
    ///
    /// A positive value on success, 0 if an error occurred
    #[doc(alias = "gtk_builder_add_objects_from_resource")]
    fn add_objects_from_resource(
        &self,
        resource_path: &str,
        object_ids: &[&str],
    ) -> Result<(), glib::Error>;
    /// Parses a string containing a [GtkBuilder UI definition][BUILDER-UI]
    /// building only the requested objects and merges
    /// them with the current contents of `self`.
    ///
    /// Upon errors 0 will be returned and `error` will be assigned a
    /// [`glib::Error`][crate::glib::Error] from the `GTK_BUILDER_ERROR` or `G_MARKUP_ERROR` domain.
    ///
    /// If you are adding an object that depends on an object that is not
    /// its child (for instance a [`TreeView`][crate::TreeView] that depends on its
    /// [`TreeModel`][crate::TreeModel]), you have to explicitly list all of them in `object_ids`.
    /// ## `buffer`
    /// the string to parse
    /// ## `length`
    /// the length of `buffer` (may be -1 if `buffer` is nul-terminated)
    /// ## `object_ids`
    /// nul-terminated array of objects to build
    ///
    /// # Returns
    ///
    /// A positive value on success, 0 if an error occurred
    #[doc(alias = "gtk_builder_add_objects_from_string")]
    fn add_objects_from_string(&self, buffer: &str, object_ids: &[&str])
        -> Result<(), glib::Error>;

    #[doc(alias = "gtk_builder_connect_signals_full")]
    fn connect_signals<
        P: FnMut(&Builder, &str) -> Box<dyn Fn(&[glib::Value]) -> Option<glib::Value> + 'static>,
    >(
        &self,
        func: P,
    );

    /// Main private entry point for building composite container
    /// components from template XML.
    ///
    /// This is exported purely to let gtk-builder-tool validate
    /// templates, applications have no need to call this function.
    /// ## `widget`
    /// the widget that is being extended
    /// ## `template_type`
    /// the type that the template is for
    /// ## `buffer`
    /// the string to parse
    /// ## `length`
    /// the length of `buffer` (may be -1 if `buffer` is nul-terminated)
    ///
    /// # Returns
    ///
    /// A positive value on success, 0 if an error occurred
    #[doc(alias = "gtk_builder_extend_with_template")]
    fn extend_with_template(
        &self,
        widget: &impl IsA<Widget>,
        template_type: glib::types::Type,
        buffer: &str,
    ) -> Result<(), glib::Error>;
}

impl<O: IsA<Builder>> BuilderExtManual for O {
    fn object<T: IsA<Object>>(&self, name: &str) -> Option<T> {
        unsafe {
            Option::<Object>::from_glib_none(ffi::gtk_builder_get_object(
                self.upcast_ref().to_glib_none().0,
                name.to_glib_none().0,
            ))
            .and_then(|obj| obj.dynamic_cast::<T>().ok())
        }
    }

    fn add_from_file<T: AsRef<Path>>(&self, file_path: T) -> Result<(), glib::Error> {
        unsafe {
            let mut error = ::std::ptr::null_mut();
            let exit_code = ffi::gtk_builder_add_from_file(
                self.upcast_ref().to_glib_none().0,
                file_path.as_ref().to_glib_none().0,
                &mut error,
            );
            assert_eq!(exit_code == 0, !error.is_null());
            if error.is_null() {
                Ok(())
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    fn add_from_resource(&self, resource_path: &str) -> Result<(), glib::Error> {
        unsafe {
            let mut error = ptr::null_mut();
            let exit_code = ffi::gtk_builder_add_from_resource(
                self.as_ref().to_glib_none().0,
                resource_path.to_glib_none().0,
                &mut error,
            );
            assert_eq!(exit_code == 0, !error.is_null());
            if error.is_null() {
                Ok(())
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    fn add_from_string(&self, buffer: &str) -> Result<(), glib::Error> {
        let length = buffer.len() as usize;
        unsafe {
            let mut error = ptr::null_mut();
            let exit_code = ffi::gtk_builder_add_from_string(
                self.as_ref().to_glib_none().0,
                buffer.to_glib_none().0,
                length,
                &mut error,
            );
            assert_eq!(exit_code == 0, !error.is_null());
            if error.is_null() {
                Ok(())
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    fn add_objects_from_resource(
        &self,
        resource_path: &str,
        object_ids: &[&str],
    ) -> Result<(), glib::Error> {
        unsafe {
            let mut error = ptr::null_mut();
            let exit_code = ffi::gtk_builder_add_objects_from_resource(
                self.as_ref().to_glib_none().0,
                resource_path.to_glib_none().0,
                object_ids.to_glib_none().0,
                &mut error,
            );
            assert_eq!(exit_code == 0, !error.is_null());
            if error.is_null() {
                Ok(())
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    fn add_objects_from_string(
        &self,
        buffer: &str,
        object_ids: &[&str],
    ) -> Result<(), glib::Error> {
        let length = buffer.len() as usize;
        unsafe {
            let mut error = ptr::null_mut();
            let exit_code = ffi::gtk_builder_add_objects_from_string(
                self.as_ref().to_glib_none().0,
                buffer.to_glib_none().0,
                length,
                object_ids.to_glib_none().0,
                &mut error,
            );
            assert_eq!(exit_code == 0, !error.is_null());
            if error.is_null() {
                Ok(())
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    fn connect_signals<
        P: FnMut(&Builder, &str) -> Box<dyn Fn(&[glib::Value]) -> Option<glib::Value> + 'static>,
    >(
        &self,
        func: P,
    ) {
        let func_data: P = func;
        unsafe extern "C" fn func_func<
            P: FnMut(&Builder, &str) -> Box<dyn Fn(&[glib::Value]) -> Option<glib::Value> + 'static>,
        >(
            builder: *mut ffi::GtkBuilder,
            object: *mut glib::gobject_ffi::GObject,
            signal_name: *const libc::c_char,
            handler_name: *const libc::c_char,
            connect_object: *mut glib::gobject_ffi::GObject,
            flags: glib::gobject_ffi::GConnectFlags,
            user_data: glib::ffi::gpointer,
        ) {
            assert!(connect_object.is_null(), "Connect object is not supported");
            assert!(
                flags & glib::gobject_ffi::G_CONNECT_SWAPPED == 0,
                "Swapped signal handler is not supported"
            );

            let builder = from_glib_borrow(builder);
            let object: Borrowed<glib::Object> = from_glib_borrow(object);
            let signal_name: Borrowed<GString> = from_glib_borrow(signal_name);
            let handler_name: Borrowed<GString> = from_glib_borrow(handler_name);
            let callback: *mut P = user_data as *const _ as usize as *mut P;
            let func = (*callback)(&builder, handler_name.as_str());
            object
                .try_connect_unsafe(
                    signal_name.as_str(),
                    flags & glib::gobject_ffi::G_CONNECT_AFTER != 0,
                    move |args| func(args),
                )
                .expect("Failed to connect to builder signal");
        }
        let func = Some(func_func::<P> as _);
        let super_callback0: &P = &func_data;
        unsafe {
            ffi::gtk_builder_connect_signals_full(
                self.as_ref().to_glib_none().0,
                func,
                super_callback0 as *const _ as usize as *mut _,
            );
        }
    }

    fn extend_with_template(
        &self,
        widget: &impl IsA<Widget>,
        template_type: glib::types::Type,
        buffer: &str,
    ) -> Result<(), glib::Error> {
        let length = buffer.len() as usize;
        unsafe {
            let mut error = ptr::null_mut();
            let exit_code = ffi::gtk_builder_extend_with_template(
                self.as_ref().to_glib_none().0,
                widget.as_ref().to_glib_none().0,
                template_type.into_glib(),
                buffer.to_glib_none().0,
                length,
                &mut error,
            );
            assert_eq!(exit_code == 0, !error.is_null());
            if error.is_null() {
                Ok(())
            } else {
                Err(from_glib_full(error))
            }
        }
    }
}