use crate::config::deser_option;
use crate::utils::oid::ObjectIdentifier;
use once_cell::sync::Lazy;
use rkyv::{Archive, Archived, Deserialize, Infallible};
use std::fmt;
use std::fmt::Write;
use std::str::FromStr;

//use crate::oidvalue;
use crate::resources::state::State;

use crate::users::UserRef;

/// Status of a Machine
#[derive(
    Clone,
    PartialEq,
    Eq,
    Debug,
    Archive,
    rkyv::Serialize,
    rkyv::Deserialize,
    serde::Serialize,
    serde::Deserialize,
)]
#[archive_attr(derive(Debug, PartialEq))]
pub enum Status {
    /// Not currently used by anybody
    Free,
    /// Used by somebody
    InUse(UserRef),
    /// Was used by somebody and now needs to be checked for cleanliness
    ToCheck(UserRef),
    /// Not used by anybody but also can not be used. E.g. down for maintenance
    Blocked(UserRef),
    /// Disabled for some other reason
    Disabled,
    /// Reserved
    Reserved(UserRef),
}

#[derive(
    Clone,
    PartialEq,
    Eq,
    Debug,
    Archive,
    rkyv::Serialize,
    rkyv::Deserialize,
    serde::Serialize,
    serde::Deserialize,
)]
#[archive_attr(derive(Debug, PartialEq))]
/// The status of the machine
pub struct MachineState {
    pub state: Status,
    #[serde(
        default,
        skip_serializing_if = "Option::is_none",
        deserialize_with = "deser_option"
    )]
    pub previous: Option<UserRef>,
}

impl fmt::Display for ArchivedMachineState {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match &self.state {
            ArchivedStatus::Free => f.write_str("free"),
            ArchivedStatus::InUse(user) => write!(f, "inuse {}", user),
            ArchivedStatus::ToCheck(user) => write!(f, "tocheck {}", user),
            ArchivedStatus::Blocked(user) => write!(f, "blocked {}", user),
            ArchivedStatus::Disabled => f.write_str("disabled"),
            ArchivedStatus::Reserved(user) => write!(f, "reserved {}", user),
        }
    }
}

impl MachineState {
    pub fn new() -> Self {
        Self {
            state: Status::Free,
            previous: None,
        }
    }

    pub fn from(dbstate: &Archived<State>) -> Self {
        let state: &Archived<MachineState> = &dbstate.inner;
        Deserialize::deserialize(state, &mut Infallible).unwrap()
    }
    pub fn to_state(&self) -> State {
        State {
            inner: self.clone(),
        }
    }

    pub fn free(previous: Option<UserRef>) -> Self {
        Self {
            state: Status::Free,
            previous,
        }
    }

    pub fn used(user: UserRef, previous: Option<UserRef>) -> Self {
        Self {
            state: Status::InUse(user),
            previous,
        }
    }

    pub fn blocked(user: UserRef, previous: Option<UserRef>) -> Self {
        Self {
            state: Status::Blocked(user),
            previous,
        }
    }

    pub fn disabled(previous: Option<UserRef>) -> Self {
        Self {
            state: Status::Disabled,
            previous,
        }
    }

    pub fn reserved(user: UserRef, previous: Option<UserRef>) -> Self {
        Self {
            state: Status::Reserved(user),
            previous,
        }
    }

    pub fn check(user: UserRef) -> Self {
        Self {
            state: Status::ToCheck(user.clone()),
            previous: Some(user),
        }
    }
}

pub static OID_TYPE: Lazy<ObjectIdentifier> =
    Lazy::new(|| ObjectIdentifier::from_str("1.3.6.1.4.1.48398.612.1.14").unwrap());
pub static OID_VALUE: Lazy<ObjectIdentifier> =
    Lazy::new(|| ObjectIdentifier::from_str("1.3.6.1.4.1.48398.612.2.4").unwrap());
//oidvalue!(OID_TYPE, MachineState, ArchivedMachineState);