use serde::{Deserialize, Serialize};
use std::{collections::HashMap, fmt::Display};

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct User {
    pub name: String,
    pub display_name: String,
    pub password: Vec<u8>,
    pub admin: bool,
    pub permissions: PermissionSet,
}

#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct PermissionSet(pub HashMap<UserPermission, bool>);

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Hash)]
#[serde(rename_all = "snake_case")]
pub enum UserPermission {
    Admin,
    OriginalStream,
    Transcode,
    ManageUsers,
    GenerateInvite,
    AccessNode(String),
}

impl UserPermission {
    pub const ALL_ENUMERABLE: &'static [UserPermission] = {
        use UserPermission::*;
        &[Admin, OriginalStream, Transcode]
    };
    pub fn default_value(&self) -> bool {
        use UserPermission::*;
        matches!(self, Transcode)
    }
}

impl Display for UserPermission {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str(&match self {
            UserPermission::Admin => format!("administrative rights"),
            UserPermission::OriginalStream => format!("download of the original media"),
            UserPermission::Transcode => format!("transcoding"),
            UserPermission::ManageUsers => format!("management of all users"),
            UserPermission::GenerateInvite => format!("inviting new users"),
            UserPermission::AccessNode(s) => format!("access to library node {s:?}"),
        })
    }
}