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use fidl::unpersist;
use fidl_cf_sc_internal_omahaclientstructuredconfig::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 allow_reboot_when_idle: bool,
    pub fuzz_percentage_range: u8,
    pub periodic_interval_minutes: u16,
    pub retry_delay_seconds: u16,
    pub startup_delay_seconds: u16,
}
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![
            0x70, 0x33, 0xd6, 0x73, 0x02, 0x0a, 0x40, 0x60, 0x94, 0xfa, 0x2b, 0x27, 0x15, 0x17,
            0x86, 0x3c, 0x72, 0x5b, 0x0c, 0xd1, 0x8d, 0x78, 0xcc, 0xec, 0xce, 0x1b, 0xe8, 0x41,
            0xed, 0x16, 0x58, 0xd4,
        ];
        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 {
            allow_reboot_when_idle: fidl_config.allow_reboot_when_idle,
            fuzz_percentage_range: fidl_config.fuzz_percentage_range,
            periodic_interval_minutes: fidl_config.periodic_interval_minutes,
            retry_delay_seconds: fidl_config.retry_delay_seconds,
            startup_delay_seconds: fidl_config.startup_delay_seconds,
        }
    }
    pub fn record_inspect(&self, inspector_node: &Node) {
        inspector_node.record_bool("allow_reboot_when_idle", self.allow_reboot_when_idle);
        inspector_node.record_uint("fuzz_percentage_range", self.fuzz_percentage_range as u64);
        inspector_node
            .record_uint("periodic_interval_minutes", self.periodic_interval_minutes as u64);
        inspector_node.record_uint("retry_delay_seconds", self.retry_delay_seconds as u64);
        inspector_node.record_uint("startup_delay_seconds", self.startup_delay_seconds as u64);
    }
}