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use fidl::unpersist;
use fidl_cf_sc_internal_pkgcacheconfig::Config as FidlConfig;
use fuchsia_inspect::Node;
use fuchsia_runtime::{take_startup_handle, HandleInfo, HandleType};
use fuchsia_zircon as zx;
#[derive(Debug)]
pub struct Config {
    pub all_packages_executable: bool,
    pub use_fxblob: bool,
    pub use_system_image: bool,
}
impl Config {
    pub fn take_from_startup_handle() -> Self {
        let config_vmo: zx::Vmo =
            take_startup_handle(HandleInfo::new(HandleType::ComponentConfigVmo, 0))
                .expect("Config VMO handle must be provided and cannot already have been taken.")
                .into();
        let config_size =
            config_vmo.get_content_size().expect("must be able to read config vmo content size");
        assert_ne!(config_size, 0, "config vmo must be non-empty");
        let mut config_bytes = Vec::new();
        config_bytes.resize(config_size as usize, 0);
        config_vmo.read(&mut config_bytes, 0).expect("must be able to read config vmo");
        let checksum_length = u16::from_le_bytes([config_bytes[0], config_bytes[1]]) as usize;
        let fidl_start = 2 + checksum_length;
        let observed_checksum = &config_bytes[2..fidl_start];
        let expected_checksum = vec![
            0x04, 0x1f, 0x28, 0xbf, 0x55, 0xed, 0xd5, 0x37, 0xd9, 0xa8, 0xc3, 0xc8, 0x28, 0x45,
            0x93, 0x62, 0xdb, 0x89, 0x66, 0x90, 0xfe, 0xa0, 0x8b, 0xad, 0x5c, 0xb5, 0xd2, 0x0e,
            0x2e, 0x54, 0x1d, 0xed,
        ];
        assert_eq!(
            observed_checksum, expected_checksum,
            "checksum from config VMO does not match expected checksum"
        );
        let fidl_config: FidlConfig = unpersist(&config_bytes[fidl_start..])
            .expect("must be able to parse bytes as config FIDL");
        Self {
            all_packages_executable: fidl_config.all_packages_executable,
            use_fxblob: fidl_config.use_fxblob,
            use_system_image: fidl_config.use_system_image,
        }
    }
    pub fn record_inspect(&self, inspector_node: &Node) {
        inspector_node.record_bool("all_packages_executable", self.all_packages_executable);
        inspector_node.record_bool("use_fxblob", self.use_fxblob);
        inspector_node.record_bool("use_system_image", self.use_system_image);
    }
}