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use fidl::unpersist;
use fidl_cf_sc_internal_fastpairproviderconfig::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 firmware_revision: String,
    pub model_id: u32,
    pub private_key: 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![
            0x02, 0x2c, 0xa3, 0x90, 0x02, 0x7d, 0x16, 0x4a, 0x52, 0x3c, 0x84, 0xef, 0xfa, 0x9a,
            0xf6, 0xa0, 0x65, 0x19, 0xfa, 0x44, 0x07, 0xcf, 0x11, 0x61, 0x70, 0x5b, 0x7c, 0x2a,
            0x07, 0xe9, 0x1c, 0x49,
        ];
        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 {
            firmware_revision: fidl_config.firmware_revision,
            model_id: fidl_config.model_id,
            private_key: fidl_config.private_key,
        }
    }
    pub fn record_inspect(&self, inspector_node: &Node) {
        inspector_node.record_string("firmware_revision", &self.firmware_revision);
        inspector_node.record_uint("model_id", self.model_id as u64);
        inspector_node.record_string("private_key", &self.private_key);
    }
}