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use fidl::unpersist;
use fidl_cf_sc_internal_pkgresolverconfig::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 blob_download_concurrency_limit: u16,
    pub blob_download_resumption_attempts_limit: u32,
    pub blob_network_body_timeout_seconds: u32,
    pub blob_network_header_timeout_seconds: u32,
    pub delivery_blob_type: u32,
    pub tuf_metadata_timeout_seconds: u32,
}
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![
            0x52, 0x0d, 0xab, 0xe2, 0xc1, 0xed, 0xd2, 0xa4, 0xf9, 0x22, 0xdb, 0xd9, 0xce, 0xf0,
            0x14, 0x4b, 0x63, 0xd9, 0x3a, 0x26, 0x20, 0xe7, 0x55, 0x74, 0x96, 0x4f, 0x06, 0x07,
            0x03, 0x48, 0xac, 0x28,
        ];
        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 {
            blob_download_concurrency_limit: fidl_config.blob_download_concurrency_limit,
            blob_download_resumption_attempts_limit: fidl_config
                .blob_download_resumption_attempts_limit,
            blob_network_body_timeout_seconds: fidl_config.blob_network_body_timeout_seconds,
            blob_network_header_timeout_seconds: fidl_config.blob_network_header_timeout_seconds,
            delivery_blob_type: fidl_config.delivery_blob_type,
            tuf_metadata_timeout_seconds: fidl_config.tuf_metadata_timeout_seconds,
        }
    }
    pub fn record_inspect(&self, inspector_node: &Node) {
        inspector_node.record_uint(
            "blob_download_concurrency_limit",
            self.blob_download_concurrency_limit as u64,
        );
        inspector_node.record_uint(
            "blob_download_resumption_attempts_limit",
            self.blob_download_resumption_attempts_limit as u64,
        );
        inspector_node.record_uint(
            "blob_network_body_timeout_seconds",
            self.blob_network_body_timeout_seconds as u64,
        );
        inspector_node.record_uint(
            "blob_network_header_timeout_seconds",
            self.blob_network_header_timeout_seconds as u64,
        );
        inspector_node.record_uint("delivery_blob_type", self.delivery_blob_type as u64);
        inspector_node
            .record_uint("tuf_metadata_timeout_seconds", self.tuf_metadata_timeout_seconds as u64);
    }
}