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use fidl::unpersist;
use fidl_cf_sc_internal_driverindexconfig::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 base_drivers: Vec<String>,
    pub bind_eager: Vec<String>,
    pub boot_drivers: Vec<String>,
    pub delay_fallback_until_base_drivers_indexed: bool,
    pub disabled_drivers: Vec<String>,
    pub driver_load_fuzzer_max_delay_ms: i64,
    pub enable_driver_load_fuzzer: bool,
    pub enable_ephemeral_drivers: 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![
            0xae, 0x61, 0x6f, 0x7e, 0xbc, 0x5e, 0x7b, 0x58, 0x3b, 0x57, 0x54, 0x66, 0x9c, 0x70,
            0xb3, 0xcf, 0xe1, 0x91, 0x98, 0x2b, 0xe6, 0x12, 0xbf, 0xcd, 0x2f, 0xd2, 0x2e, 0x85,
            0x05, 0x0a, 0xb7, 0x45,
        ];
        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 {
            base_drivers: fidl_config.base_drivers,
            bind_eager: fidl_config.bind_eager,
            boot_drivers: fidl_config.boot_drivers,
            delay_fallback_until_base_drivers_indexed: fidl_config
                .delay_fallback_until_base_drivers_indexed,
            disabled_drivers: fidl_config.disabled_drivers,
            driver_load_fuzzer_max_delay_ms: fidl_config.driver_load_fuzzer_max_delay_ms,
            enable_driver_load_fuzzer: fidl_config.enable_driver_load_fuzzer,
            enable_ephemeral_drivers: fidl_config.enable_ephemeral_drivers,
        }
    }
    pub fn record_inspect(&self, inspector_node: &Node) {
        let arr = inspector_node.create_string_array("base_drivers", self.base_drivers.len());
        for i in 0..self.base_drivers.len() {
            arr.set(i, &self.base_drivers[i]);
        }
        inspector_node.record(arr);
        let arr = inspector_node.create_string_array("bind_eager", self.bind_eager.len());
        for i in 0..self.bind_eager.len() {
            arr.set(i, &self.bind_eager[i]);
        }
        inspector_node.record(arr);
        let arr = inspector_node.create_string_array("boot_drivers", self.boot_drivers.len());
        for i in 0..self.boot_drivers.len() {
            arr.set(i, &self.boot_drivers[i]);
        }
        inspector_node.record(arr);
        inspector_node.record_bool(
            "delay_fallback_until_base_drivers_indexed",
            self.delay_fallback_until_base_drivers_indexed,
        );
        let arr =
            inspector_node.create_string_array("disabled_drivers", self.disabled_drivers.len());
        for i in 0..self.disabled_drivers.len() {
            arr.set(i, &self.disabled_drivers[i]);
        }
        inspector_node.record(arr);
        inspector_node
            .record_int("driver_load_fuzzer_max_delay_ms", self.driver_load_fuzzer_max_delay_ms);
        inspector_node.record_bool("enable_driver_load_fuzzer", self.enable_driver_load_fuzzer);
        inspector_node.record_bool("enable_ephemeral_drivers", self.enable_ephemeral_drivers);
    }
}