use rocket::request::FromParam;
use serde::Deserialize;
use std::{
    collections::{HashMap, HashSet},
    sync::LazyLock,
};

pub static KNOWN_SOFTWARE: LazyLock<KnownSoftware> =
    LazyLock::new(|| serde_json::from_str(include_str!("../known-software.json")).unwrap());
pub static KNOWN_SOFTWARE_NAMES: LazyLock<HashMap<String, String>> =
    LazyLock::new(|| KNOWN_SOFTWARE.get_name_map());
pub static KNOWN_SOFTWARE_NODEINFO_NAMES: LazyLock<
    HashMap<String, (String, HashMap<String, String>)>,
> = LazyLock::new(|| KNOWN_SOFTWARE.get_nodeinfo_name_map());

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct Software {
    name: String,
    nodeinfo_name: String,
    build_metadata: Option<String>,
    aliases: HashSet<String>,
    groups: HashSet<String>,
    fork_of: Option<String>,
}

#[derive(Deserialize)]
pub struct Group {
    name: String,
    aliases: HashSet<String>,
}

#[derive(Deserialize)]
pub struct KnownSoftware {
    software: HashMap<String, Software>,
    groups: HashMap<String, Group>,
}

impl KnownSoftware {
    fn get_name_map(&self) -> HashMap<String, String> {
        let mut map = HashMap::new();
        self.software.iter().for_each(|(name, software)| {
            software.aliases.iter().for_each(|alias| {
                assert_eq!(map.insert(alias.to_owned(), name.to_owned()), None);
            });
        });
        self.groups.iter().for_each(|(name, group)| {
            group.aliases.iter().for_each(|alias: &String| {
                assert_eq!(map.insert(alias.to_owned(), name.to_owned()), None);
            });
        });
        map
    }

    fn get_nodeinfo_name_map(&self) -> HashMap<String, (String, HashMap<String, String>)> {
        let mut map: HashMap<String, (String, HashMap<String, String>)> = HashMap::new();
        self.software.iter().for_each(|(name, software)| {
            if let Some((mut_name, mut_map)) = map.get_mut(&software.nodeinfo_name) {
                if let Some(build_metadata) = &software.build_metadata {
                    assert_eq!(
                        mut_map.insert(build_metadata.to_owned(), name.to_owned()),
                        None
                    );
                } else {
                    *mut_name = name.to_owned();
                }
            } else {
                let mut build_metadata_map = HashMap::new();
                if let Some(build_metadata) = &software.build_metadata {
                    build_metadata_map.insert(build_metadata.to_owned(), name.to_owned());
                }
                map.insert(
                    software.nodeinfo_name.to_owned(),
                    (name.to_owned(), build_metadata_map),
                );
            }
        });
        map
    }
}

pub struct KnownInstanceSoftware<'r> {
    pub requested: &'r str,
    pub resolved: &'static String,
}

impl<'r> FromParam<'r> for KnownInstanceSoftware<'r> {
    type Error = &'r str;

    fn from_param(param: &'r str) -> Result<Self, Self::Error> {
        if let Some(resolved) = KNOWN_SOFTWARE_NAMES.get(param) {
            Ok(KnownInstanceSoftware {
                requested: param,
                resolved,
            })
        } else {
            Err(param)
        }
    }
}