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use fidl::unpersist;
use fidl_cf_sc_internal_elementconfig::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 default_collection: String,
    pub url_to_collection: Vec<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![
            0x3e, 0x91, 0x4b, 0x07, 0x29, 0x7e, 0xb9, 0xa0, 0xd5, 0x82, 0xd9, 0x56, 0xd5, 0x7f,
            0x8b, 0x09, 0x59, 0xa1, 0x96, 0x43, 0xca, 0x29, 0xfa, 0x1e, 0xfa, 0x55, 0x19, 0x79,
            0xdc, 0x4b, 0x57, 0x00,
        ];
        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 {
            default_collection: fidl_config.default_collection,
            url_to_collection: fidl_config.url_to_collection,
        }
    }
    pub fn record_inspect(&self, inspector_node: &Node) {
        inspector_node.record_string("default_collection", &self.default_collection);
        let arr =
            inspector_node.create_string_array("url_to_collection", self.url_to_collection.len());
        for i in 0..self.url_to_collection.len() {
            arr.set(i, &self.url_to_collection[i]);
        }
        inspector_node.record(arr);
    }
}