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use fidl::unpersist;
use fidl_cf_sc_internal_httpsdateconfig::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 first_rtt_time_factor: u16,
    pub https_timeout_sec: u8,
    pub max_attempts_urgency_high: u32,
    pub max_attempts_urgency_low: u32,
    pub max_attempts_urgency_medium: u32,
    pub num_polls_urgency_high: u32,
    pub num_polls_urgency_low: u32,
    pub num_polls_urgency_medium: u32,
    pub standard_deviation_bound_percentage: u8,
    pub time_source_endpoint_url: String,
    pub use_pull_api: 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![
            0x47, 0x9d, 0xa0, 0xef, 0x6a, 0xf6, 0xb8, 0xac, 0x91, 0xd9, 0x20, 0xb6, 0xe9, 0x78,
            0x94, 0xb6, 0x0a, 0xbf, 0x2c, 0x4f, 0x88, 0x4e, 0xa1, 0xdc, 0x15, 0x86, 0xae, 0x9e,
            0x97, 0x2f, 0x1c, 0x6f,
        ];
        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 {
            first_rtt_time_factor: fidl_config.first_rtt_time_factor,
            https_timeout_sec: fidl_config.https_timeout_sec,
            max_attempts_urgency_high: fidl_config.max_attempts_urgency_high,
            max_attempts_urgency_low: fidl_config.max_attempts_urgency_low,
            max_attempts_urgency_medium: fidl_config.max_attempts_urgency_medium,
            num_polls_urgency_high: fidl_config.num_polls_urgency_high,
            num_polls_urgency_low: fidl_config.num_polls_urgency_low,
            num_polls_urgency_medium: fidl_config.num_polls_urgency_medium,
            standard_deviation_bound_percentage: fidl_config.standard_deviation_bound_percentage,
            time_source_endpoint_url: fidl_config.time_source_endpoint_url,
            use_pull_api: fidl_config.use_pull_api,
        }
    }
    pub fn record_inspect(&self, inspector_node: &Node) {
        inspector_node.record_uint("first_rtt_time_factor", self.first_rtt_time_factor as u64);
        inspector_node.record_uint("https_timeout_sec", self.https_timeout_sec as u64);
        inspector_node
            .record_uint("max_attempts_urgency_high", self.max_attempts_urgency_high as u64);
        inspector_node
            .record_uint("max_attempts_urgency_low", self.max_attempts_urgency_low as u64);
        inspector_node
            .record_uint("max_attempts_urgency_medium", self.max_attempts_urgency_medium as u64);
        inspector_node.record_uint("num_polls_urgency_high", self.num_polls_urgency_high as u64);
        inspector_node.record_uint("num_polls_urgency_low", self.num_polls_urgency_low as u64);
        inspector_node
            .record_uint("num_polls_urgency_medium", self.num_polls_urgency_medium as u64);
        inspector_node.record_uint(
            "standard_deviation_bound_percentage",
            self.standard_deviation_bound_percentage as u64,
        );
        inspector_node.record_string("time_source_endpoint_url", &self.time_source_endpoint_url);
        inspector_node.record_bool("use_pull_api", self.use_pull_api);
    }
}