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//! Wrapper of [Sokol] libraries
//!
//! [Sokol]: https://github.com/floooh/sokol
//!
//! Tip: Sokol [considers] zero-initizialized structurs to be in ‘default state’.
//!
//! [considers]: https://floooh.github.io/2017/08/06/sokol-api-update.html
//!
//! Very early in progress... please don't try to use it!

pub use rokol_ffi as ffi;
use std::ffi::CString;

pub mod app;
pub mod gfx;

/// Any error upcasted to [`Box`]
pub type Error = Box<dyn std::error::Error>;

/// Any error is upcasted to [`Box`]
pub type Result = std::result::Result<(), Error>;

/// Configuration to run a Rokol application
///
/// Basically a wrapper of [`ffi::app::sapp_desc`].
#[derive(Debug)]
pub struct Rokol {
    /// Preferred width of the window / canvas
    pub w: u32,
    /// Preferred height of the window / canvas
    pub h: u32,
    /// Window title
    pub title: String,

    pub msaa_sample_count: u32,

    /// [Platform] Preferred swap interval
    pub swap_interval: u32,
    pub use_high_dpi: bool,
    pub is_full_screen: bool,
    /// [Platform]
    pub enable_alpha: bool,
    pub use_user_cursor_image: bool,

    pub enable_clipboard: bool,
    pub max_clipboard_size_in_bytes: u32,

    pub enable_drag_and_drop: bool,
    pub n_max_dropped_files: u32,
    pub max_dropped_file_path_len_in_bytes: u32,
    // missing fields from Sokol: html5, ios, gl
}

impl Default for Rokol {
    fn default() -> Self {
        Self {
            w: 640,
            h: 360,
            title: "Untitled".to_string(),
            msaa_sample_count: 1,
            swap_interval: 1,
            use_high_dpi: true,
            is_full_screen: false,
            enable_alpha: true,
            use_user_cursor_image: false,
            enable_clipboard: false,
            max_clipboard_size_in_bytes: 8192,
            enable_drag_and_drop: false,
            n_max_dropped_files: 1,
            max_dropped_file_path_len_in_bytes: 2048,
        }
    }
}

impl Rokol {
    pub fn run<T: app::RApp>(&self, app: &mut T) -> Result {
        #[cfg(rokol_gfx = "glcore33")]
        log::info!("Rokol renderer: glcore33");

        #[cfg(rokol_gfx = "metal")]
        log::info!("Rokol renderer: metal");

        #[cfg(rokol_gfx = "d3d11")]
        log::info!("Rokol renderer: D3D11");

        let mut desc = ffi::app::sapp_desc::default();

        desc.width = self.w as i32;
        desc.height = self.h as i32;

        let title = CString::new(self.title.as_bytes())?;
        desc.window_title = title.as_ptr() as *mut _;

        desc.swap_interval = self.swap_interval as i32;

        desc.high_dpi = self.use_high_dpi;
        desc.fullscreen = self.is_full_screen;

        desc.alpha = self.enable_alpha;
        desc.user_cursor = self.use_user_cursor_image;

        desc.enable_clipboard = self.enable_clipboard;
        desc.clipboard_size = self.max_clipboard_size_in_bytes as i32;

        desc.enable_dragndrop = self.enable_drag_and_drop;
        desc.max_dropped_files = self.n_max_dropped_files as i32;
        desc.max_dropped_file_path_length = self.max_dropped_file_path_len_in_bytes as i32;

        use self::app::RAppFfiCallback;
        desc.user_data = app as *mut _ as *mut _;

        desc.init_userdata_cb = Some(<T as RAppFfiCallback>::init_userdata_cb);
        desc.frame_userdata_cb = Some(<T as RAppFfiCallback>::frame_userdata_cb);
        desc.cleanup_userdata_cb = Some(<T as RAppFfiCallback>::cleanup_userdata_cb);
        desc.event_userdata_cb = Some(<T as RAppFfiCallback>::event_userdata_cb);
        desc.fail_userdata_cb = Some(<T as RAppFfiCallback>::fail_userdata_cb);

        // desc.stream_userdata_cb = Some(<T as RAppFfiCallback>::stream_userdata_cb);

        unsafe {
            rokol_ffi::app::sapp_run(&mut desc as *mut _);
        }

        Ok(())
    }
}

/// `sokol_glue.h`
///
/// Creates application description considering `sokol_gfx.h`. Used in [`app::RApp::init`].
pub fn app_desc() -> rokol_ffi::gfx::sg_desc {
    let mut desc: rokol_ffi::gfx::sg_desc = Default::default();
    desc.context = unsafe { rokol_ffi::glue::sapp_sgcontext() };
    desc
}