use anyhow::Context as _;
use blade_graphics as gpu;
use std::sync::Arc;
use util::ResultExt;

#[cfg_attr(target_os = "macos", derive(Clone))]
pub struct BladeContext {
    pub(super) gpu: Arc<gpu::Context>,
}

impl BladeContext {
    pub fn new() -> anyhow::Result<Self> {
        let device_id_forced = match std::env::var("ZED_DEVICE_ID") {
            Ok(val) => val
                .parse()
                .context("Failed to parse device ID from `ZED_DEVICE_ID` environment variable")
                .log_err(),
            Err(std::env::VarError::NotPresent) => None,
            err => {
                err.context("Failed to read value of `ZED_DEVICE_ID` environment variable")
                    .log_err();
                None
            }
        };
        let gpu = Arc::new(
            unsafe {
                gpu::Context::init(gpu::ContextDesc {
                    presentation: true,
                    validation: false,
                    device_id: device_id_forced.unwrap_or(0),
                    ..Default::default()
                })
            }
            .map_err(|e| anyhow::anyhow!("{:?}", e))?,
        );
        Ok(Self { gpu })
    }
}