//! Strongly-typed identifiers for shepherdd

use serde::{Deserialize, Serialize};
use std::fmt;
use uuid::Uuid;

/// Unique identifier for an entry in the policy whitelist
#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct EntryId(String);

impl EntryId {
    pub fn new(id: impl Into<String>) -> Self {
        Self(id.into())
    }

    pub fn as_str(&self) -> &str {
        &self.0
    }
}

impl fmt::Display for EntryId {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{}", self.0)
    }
}

impl From<String> for EntryId {
    fn from(s: String) -> Self {
        Self(s)
    }
}

impl From<&str> for EntryId {
    fn from(s: &str) -> Self {
        Self(s.to_string())
    }
}

/// Unique identifier for a running session
#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct SessionId(Uuid);

impl SessionId {
    pub fn new() -> Self {
        Self(Uuid::new_v4())
    }

    pub fn from_uuid(uuid: Uuid) -> Self {
        Self(uuid)
    }

    pub fn as_uuid(&self) -> &Uuid {
        &self.0
    }
}

impl Default for SessionId {
    fn default() -> Self {
        Self::new()
    }
}

impl fmt::Display for SessionId {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{}", self.0)
    }
}

/// Unique identifier for a connected IPC client
#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct ClientId(Uuid);

impl ClientId {
    pub fn new() -> Self {
        Self(Uuid::new_v4())
    }

    pub fn from_uuid(uuid: Uuid) -> Self {
        Self(uuid)
    }
}

impl Default for ClientId {
    fn default() -> Self {
        Self::new()
    }
}

impl fmt::Display for ClientId {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{}", self.0)
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn entry_id_equality() {
        let id1 = EntryId::new("game-1");
        let id2 = EntryId::new("game-1");
        let id3 = EntryId::new("game-2");

        assert_eq!(id1, id2);
        assert_ne!(id1, id3);
    }

    #[test]
    fn session_id_uniqueness() {
        let s1 = SessionId::new();
        let s2 = SessionId::new();
        assert_ne!(s1, s2);
    }

    #[test]
    fn ids_serialize_deserialize() {
        let entry_id = EntryId::new("test-entry");
        let json = serde_json::to_string(&entry_id).unwrap();
        let parsed: EntryId = serde_json::from_str(&json).unwrap();
        assert_eq!(entry_id, parsed);

        let session_id = SessionId::new();
        let json = serde_json::to_string(&session_id).unwrap();
        let parsed: SessionId = serde_json::from_str(&json).unwrap();
        assert_eq!(session_id, parsed);
    }
}