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/* LICENSE BEGIN
    This file is part of the SixtyFPS Project -- https://sixtyfps.io
    Copyright (c) 2021 Olivier Goffart <olivier.goffart@sixtyfps.io>
    Copyright (c) 2021 Simon Hausmann <simon.hausmann@sixtyfps.io>

    SPDX-License-Identifier: GPL-3.0-only
    This file is also available under commercial licensing terms.
    Please contact info@sixtyfps.io for more information.
LICENSE END */
/*!

**NOTE**: This library is an **internal** crate for the [SixtyFPS project](https://sixtyfps.io).
This crate should **not be used directly** by applications using SixtyFPS.
You should use the `sixtyfps` crate instead.

**WARNING**: This crate does not follow the semver convention for versioning and can
only be used with `version = "=x.y.z"` in Cargo.toml.


The purpose of this crate is to select the default backend for [SixtyFPS](https://sixtyfps.io)

The backend can either be a runtime or a build time decision.  The runtime decision is decided
by the `SIXTYFPS_BACKEND` environment variable. The built time default depends on the platform.
In order for the crate to be available at runtime, they need to be added as feature

*/
#![doc(html_logo_url = "https://sixtyfps.io/resources/logo.drawio.svg")]

cfg_if::cfg_if! {
    if #[cfg(any(target_os="windows", target_os="macos", target_os = "linux", target_os = "dragonfly", target_os = "freebsd", target_os = "openbsd", target_os = "netbsd"))] {
        use sixtyfps_rendering_backend_qt as default_backend;
    } else {
        use sixtyfps_rendering_backend_gl as default_backend;
    }
}

pub fn backend() -> &'static dyn sixtyfps_corelib::backend::Backend {
    sixtyfps_corelib::backend::instance_or_init(|| {
        #[cfg(any(
            feature = "sixtyfps-rendering-backend-qt",
            feature = "sixtyfps-rendering-backend-gl"
        ))]
        let backend_config = std::env::var("SIXTYFPS_BACKEND").unwrap_or_default();

        #[cfg(feature = "sixtyfps-rendering-backend-qt")]
        if backend_config == "Qt" {
            return Box::new(sixtyfps_rendering_backend_qt::Backend);
        }
        #[cfg(feature = "sixtyfps-rendering-backend-gl")]
        if backend_config == "GL" {
            return Box::new(sixtyfps_rendering_backend_gl::Backend);
        }

        #[cfg(any(
            feature = "sixtyfps-rendering-backend-qt",
            feature = "sixtyfps-rendering-backend-gl"
        ))]
        if !backend_config.is_empty() {
            eprintln!("Could not load rendering backend {}, fallback to default", backend_config)
        }

        #[cfg(feature = "sixtyfps-rendering-backend-gl")]
        if !default_backend::IS_AVAILABLE {
            // If Qt is not available always fallback to Gl
            return Box::new(sixtyfps_rendering_backend_gl::Backend);
        }
        Box::new(default_backend::Backend)
    })
}

pub use default_backend::{
    native_widgets, Backend, NativeGlobals, NativeWidgets, HAS_NATIVE_STYLE,
};

#[doc(hidden)]
#[cold]
#[cfg(not(target_arch = "wasm32"))]
pub fn use_modules() {
    sixtyfps_corelib::use_modules();
    default_backend::use_modules();
    #[cfg(feature = "sixtyfps-rendering-backend-qt")]
    sixtyfps_rendering_backend_qt::use_modules();
    #[cfg(feature = "sixtyfps-rendering-backend-gl")]
    sixtyfps_rendering_backend_gl::use_modules();
}