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use fidl::unpersist;
use fidl_cf_sc_internal_hwinfostructuredconfig::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 product_manufacturer: String,
    pub product_model: String,
    pub product_name: String,
}
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![
            0xa4, 0x87, 0x1c, 0x22, 0x13, 0xd9, 0x41, 0xa7, 0xe1, 0xad, 0xa4, 0xf0, 0xc3, 0xb2,
            0xdf, 0xbb, 0x24, 0x49, 0x70, 0x36, 0x35, 0xf0, 0x46, 0xeb, 0x1a, 0x5b, 0x0f, 0xaf,
            0x13, 0x4c, 0x83, 0xcc,
        ];
        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 {
            product_manufacturer: fidl_config.product_manufacturer,
            product_model: fidl_config.product_model,
            product_name: fidl_config.product_name,
        }
    }
    pub fn record_inspect(&self, inspector_node: &Node) {
        inspector_node.record_string("product_manufacturer", &self.product_manufacturer);
        inspector_node.record_string("product_model", &self.product_model);
        inspector_node.record_string("product_name", &self.product_name);
    }
}