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use fidl::encoding::unpersist;
use fidl_cf_sc_internal_accounthandlerstructuredconfig::Config as FidlConfig;
use fuchsia_inspect::{ArrayProperty, Node};
use fuchsia_runtime::{take_startup_handle, HandleInfo, HandleType};
use fuchsia_zircon as zx;
#[derive(Debug)]
pub struct Config {
    pub available_mechanisms: Vec<String>,
    pub is_ephemeral: bool,
    pub storage_manager: 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![
            0xde, 0x76, 0xe2, 0xbb, 0x41, 0x05, 0x3f, 0xc6, 0x80, 0x84, 0x8d, 0x2f, 0xfb, 0x40,
            0xb6, 0x9c, 0xb7, 0x67, 0x68, 0x6e, 0x26, 0xa6, 0x62, 0x50, 0x5f, 0x2b, 0xc2, 0x45,
            0x93, 0xa5, 0xb3, 0x5e,
        ];
        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 {
            available_mechanisms: fidl_config.available_mechanisms,
            is_ephemeral: fidl_config.is_ephemeral,
            storage_manager: fidl_config.storage_manager,
        }
    }
    pub fn record_inspect(&self, inspector_node: &Node) {
        let arr = inspector_node
            .create_string_array("available_mechanisms", self.available_mechanisms.len());
        for i in 0..self.available_mechanisms.len() {
            arr.set(i, &self.available_mechanisms[i]);
        }
        inspector_node.record(arr);
        inspector_node.record_bool("is_ephemeral", self.is_ephemeral);
        inspector_node.record_string("storage_manager", &self.storage_manager);
    }
}