backbone-mail 0.2.32

//! State machine for MailNotificationHooks workflow
//!
//! Generated by metaphor-schema

use serde::{Deserialize, Serialize};
use std::str::FromStr;

/// States for MailNotificationHooks workflow
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum MailNotificationHooksState {
    /// Initial state
    Ready,
    Process,
    Pending,
    /// Final state
    Sent,
    /// Final state
    Bounce,
    Exception,
    /// Final state
    Canceled,
}

impl Default for MailNotificationHooksState {
    fn default() -> Self {
        Self::Ready
    }
}

impl std::fmt::Display for MailNotificationHooksState {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Self::Ready => write!(f, "ready"),
            Self::Process => write!(f, "process"),
            Self::Pending => write!(f, "pending"),
            Self::Sent => write!(f, "sent"),
            Self::Bounce => write!(f, "bounce"),
            Self::Exception => write!(f, "exception"),
            Self::Canceled => write!(f, "canceled"),
        }
    }
}

impl FromStr for MailNotificationHooksState {
    type Err = StateMachineError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s.to_lowercase().as_str() {
            "ready" => Ok(Self::Ready),
            "process" => Ok(Self::Process),
            "pending" => Ok(Self::Pending),
            "sent" => Ok(Self::Sent),
            "bounce" => Ok(Self::Bounce),
            "exception" => Ok(Self::Exception),
            "canceled" => Ok(Self::Canceled),
            _ => Err(StateMachineError::InvalidState(s.to_string())),
        }
    }
}

impl MailNotificationHooksState {
    /// Check if this is the initial state
    pub fn is_initial(&self) -> bool {
        matches!(self, Self::Ready)
    }

    /// Check if this is a final state
    pub fn is_final(&self) -> bool {
        matches!(self, Self::Sent | Self::Bounce | Self::Canceled)
    }

    /// Get all possible states
    pub fn all() -> Vec<Self> {
        vec![
            Self::Ready,
            Self::Process,
            Self::Pending,
            Self::Sent,
            Self::Bounce,
            Self::Exception,
            Self::Canceled,
        ]
    }
}

/// Transitions for MailNotificationHooks workflow
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum MailNotificationHooksTransition {
    /// ready -> process
    DispatchStarted,
    /// process, exception -> pending
    SmtpAccepted,
    /// pending -> sent
    DeliveryConfirmed,
    /// process -> sent
    InstantDelivered,
    /// pending, process, exception -> bounce
    Bounced,
    /// process, pending -> exception
    SendFailed,
    /// ready, process, pending -> canceled
    Canceled,
}

impl std::fmt::Display for MailNotificationHooksTransition {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Self::DispatchStarted => write!(f, "dispatch_started"),
            Self::SmtpAccepted => write!(f, "smtp_accepted"),
            Self::DeliveryConfirmed => write!(f, "delivery_confirmed"),
            Self::InstantDelivered => write!(f, "instant_delivered"),
            Self::Bounced => write!(f, "bounced"),
            Self::SendFailed => write!(f, "send_failed"),
            Self::Canceled => write!(f, "canceled"),
        }
    }
}

impl FromStr for MailNotificationHooksTransition {
    type Err = StateMachineError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s.to_lowercase().as_str() {
            "dispatch_started" => Ok(Self::DispatchStarted),
            "smtp_accepted" => Ok(Self::SmtpAccepted),
            "delivery_confirmed" => Ok(Self::DeliveryConfirmed),
            "instant_delivered" => Ok(Self::InstantDelivered),
            "bounced" => Ok(Self::Bounced),
            "send_failed" => Ok(Self::SendFailed),
            "canceled" => Ok(Self::Canceled),
            _ => Err(StateMachineError::InvalidTransition(s.to_string())),
        }
    }
}

impl MailNotificationHooksTransition {
    /// Get the target state of this transition
    pub fn target_state(&self) -> MailNotificationHooksState {
        match self {
            Self::DispatchStarted => MailNotificationHooksState::Process,
            Self::SmtpAccepted => MailNotificationHooksState::Pending,
            Self::DeliveryConfirmed => MailNotificationHooksState::Sent,
            Self::InstantDelivered => MailNotificationHooksState::Sent,
            Self::Bounced => MailNotificationHooksState::Bounce,
            Self::SendFailed => MailNotificationHooksState::Exception,
            Self::Canceled => MailNotificationHooksState::Canceled,
        }
    }

    /// Get all transitions
    pub fn all() -> Vec<Self> {
        vec![
            Self::DispatchStarted,
            Self::SmtpAccepted,
            Self::DeliveryConfirmed,
            Self::InstantDelivered,
            Self::Bounced,
            Self::SendFailed,
            Self::Canceled,
        ]
    }

    /// Get allowed roles for this transition
    pub fn allowed_roles(&self) -> &'static [&'static str] {
        match self {
            Self::DispatchStarted => &[],
            Self::SmtpAccepted => &[],
            Self::DeliveryConfirmed => &[],
            Self::InstantDelivered => &[],
            Self::Bounced => &[],
            Self::SendFailed => &[],
            Self::Canceled => &[],
        }
    }
}

use super::StateMachineError;

/// State machine for MailNotificationHooks workflow
#[derive(Debug, Clone)]
pub struct MailNotificationHooksStateMachine {
    current_state: MailNotificationHooksState,
}

impl MailNotificationHooksStateMachine {
    /// Create a new state machine with initial state
    pub fn new() -> Self {
        Self {
            current_state: MailNotificationHooksState::default(),
        }
    }

    /// Create from an existing state
    pub fn from_state(state: MailNotificationHooksState) -> Self {
        Self { current_state: state }
    }

    /// Get the current state
    pub fn current_state(&self) -> MailNotificationHooksState {
        self.current_state
    }

    /// Check if a transition is allowed from the current state
    pub fn can_transition(&self, transition: MailNotificationHooksTransition) -> bool {
        if matches!(self.current_state, MailNotificationHooksState::Sent | MailNotificationHooksState::Bounce | MailNotificationHooksState::Canceled) {
            return false;
        }

        match (self.current_state, transition) {
            (MailNotificationHooksState::Ready, MailNotificationHooksTransition::DispatchStarted) => true,
            (MailNotificationHooksState::Process, MailNotificationHooksTransition::SmtpAccepted) => true,
            (MailNotificationHooksState::Exception, MailNotificationHooksTransition::SmtpAccepted) => true,
            (MailNotificationHooksState::Pending, MailNotificationHooksTransition::DeliveryConfirmed) => true,
            (MailNotificationHooksState::Process, MailNotificationHooksTransition::InstantDelivered) => true,
            (MailNotificationHooksState::Pending, MailNotificationHooksTransition::Bounced) => true,
            (MailNotificationHooksState::Process, MailNotificationHooksTransition::Bounced) => true,
            (MailNotificationHooksState::Exception, MailNotificationHooksTransition::Bounced) => true,
            (MailNotificationHooksState::Process, MailNotificationHooksTransition::SendFailed) => true,
            (MailNotificationHooksState::Pending, MailNotificationHooksTransition::SendFailed) => true,
            (MailNotificationHooksState::Ready, MailNotificationHooksTransition::Canceled) => true,
            (MailNotificationHooksState::Process, MailNotificationHooksTransition::Canceled) => true,
            (MailNotificationHooksState::Pending, MailNotificationHooksTransition::Canceled) => true,
            _ => false,
        }
    }

    /// Check if a transition is allowed for a given role
    pub fn can_transition_with_role(&self, transition: MailNotificationHooksTransition, role: &str) -> bool {
        if !self.can_transition(transition) {
            return false;
        }

        let allowed_roles = transition.allowed_roles();
        if allowed_roles.is_empty() {
            return true; // No role restriction
        }

        allowed_roles.iter().any(|r| *r == role || *r == "*")
    }

    /// Apply a transition, returning the new state
    pub fn transition(&mut self, transition: MailNotificationHooksTransition) -> Result<MailNotificationHooksState, StateMachineError> {
        if !self.can_transition(transition) {
            return Err(StateMachineError::TransitionNotAllowed {
                transition: transition.to_string(),
                from: self.current_state.to_string(),
            });
        }

        self.current_state = transition.target_state();
        Ok(self.current_state)
    }

    /// Apply a transition with role check
    pub fn transition_with_role(&mut self, transition: MailNotificationHooksTransition, role: &str) -> Result<MailNotificationHooksState, StateMachineError> {
        // Check basic transition validity first
        if !self.can_transition(transition) {
            return Err(StateMachineError::TransitionNotAllowed {
                transition: transition.to_string(),
                from: self.current_state.to_string(),
            });
        }

        // Check role authorization
        if !self.can_transition_with_role(transition, role) {
            return Err(StateMachineError::RoleNotAuthorized {
                role: role.to_string(),
                transition: transition.to_string(),
            });
        }

        self.current_state = transition.target_state();
        Ok(self.current_state)
    }

    /// Get all available transitions from the current state
    pub fn available_transitions(&self) -> Vec<MailNotificationHooksTransition> {
        MailNotificationHooksTransition::all()
            .into_iter()
            .filter(|t| self.can_transition(*t))
            .collect()
    }

    /// Get all available transitions for a given role
    pub fn available_transitions_for_role(&self, role: &str) -> Vec<MailNotificationHooksTransition> {
        MailNotificationHooksTransition::all()
            .into_iter()
            .filter(|t| self.can_transition_with_role(*t, role))
            .collect()
    }

    /// Attempt to transition directly to a target state.
    ///
    /// Finds any transition that leads to the target state and applies it.
    /// Returns Err if no valid transition leads from current state to target.
    pub fn transition_to_state(&mut self, target: MailNotificationHooksState) -> Result<MailNotificationHooksState, StateMachineError> {
        let valid = MailNotificationHooksTransition::all().into_iter()
            .filter(|t| self.can_transition(*t))
            .find(|t| t.target_state() == target);
        match valid {
            Some(t) => self.transition(t),
            None => Err(StateMachineError::TransitionNotAllowed {
                transition: target.to_string(),
                from: self.current_state.to_string(),
            }),
        }
    }
}

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

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

    #[test]
    fn test_initial_state() {
        let sm = MailNotificationHooksStateMachine::new();
        assert_eq!(sm.current_state(), MailNotificationHooksState::Ready);
        assert!(sm.current_state().is_initial());
    }

    #[test]
    fn test_valid_transition() {
        let mut sm = MailNotificationHooksStateMachine::from_state(MailNotificationHooksState::Ready);
        assert!(sm.can_transition(MailNotificationHooksTransition::DispatchStarted));
        let result = sm.transition(MailNotificationHooksTransition::DispatchStarted);
        assert!(result.is_ok());
        assert_eq!(sm.current_state(), MailNotificationHooksState::Process);
    }

    #[test]
    fn test_invalid_transition() {
        let mut sm = MailNotificationHooksStateMachine::from_state(MailNotificationHooksState::Ready);
        // SmtpAccepted is not valid from Ready state
        let result = sm.transition(MailNotificationHooksTransition::SmtpAccepted);
        assert!(result.is_err());
    }

    #[test]
    fn test_state_parsing() {
        let state: MailNotificationHooksState = "ready".parse().unwrap();
        assert_eq!(state, MailNotificationHooksState::Ready);
    }

    #[test]
    fn test_available_transitions() {
        let sm = MailNotificationHooksStateMachine::new();
        let available = sm.available_transitions();
        // Should have at least some transitions available from initial state
        assert!(!available.is_empty() || sm.current_state().is_final());
    }
}