ebi_bpmn 0.0.44

use crate::{
    BusinessProcessModelAndNotation,
    element::BPMNElementTrait,
    elements::task::task_consumed_tokens,
    marking::{BPMNRootMarking, BPMNSubMarking, Token},
    parser::parser_state::GlobalIndex,
    semantics::TransitionIndex,
    traits::{
        objectable::{BPMNObject, EMPTY_FLOWS},
        processable::Processable,
        transitionable::{
            Transitionable, enabledness_xor_join_only, execute_transition_message_produce,
            execute_transition_xor_join_consume, number_of_transitions_xor_join_only,
            transition_2_consumed_tokens_xor_join, transition_2_produced_tokens_message,
        },
    },
};
use anyhow::{Result, anyhow};
use bitvec::{bitvec, vec::BitVec};
use ebi_activity_key::Activity;
use ebi_arithmetic::{Fraction, One};

#[derive(Debug, Clone)]
pub struct BPMNMessageEndEvent {
    pub(crate) global_index: GlobalIndex,
    pub(crate) id: String,
    pub(crate) local_index: usize,
    pub(crate) message_marker_id: Option<String>,
    pub(crate) incoming_sequence_flows: Vec<usize>,
    pub(crate) outgoing_message_flow: Option<usize>,
}

impl BPMNElementTrait for BPMNMessageEndEvent {
    fn add_incoming_sequence_flow(&mut self, flow_index: usize) -> Result<()> {
        self.incoming_sequence_flows.push(flow_index);
        Ok(())
    }

    fn add_outgoing_sequence_flow(&mut self, _flow_index: usize) -> Result<()> {
        Err(anyhow!(
            "message end events cannot have outgoing sequence flows"
        ))
    }

    fn add_incoming_message_flow(&mut self, _flow_index: usize) -> Result<()> {
        Err(anyhow!(
            "message end events cannot have incoming message flows"
        ))
    }

    fn add_outgoing_message_flow(&mut self, flow_index: usize) -> Result<()> {
        if self.outgoing_message_flow.is_some() {
            return Err(anyhow!("cannot add a second outgoing message flow"));
        }
        self.outgoing_message_flow = Some(flow_index);
        Ok(())
    }

    fn verify_structural_correctness(
        &self,
        _parent: &dyn Processable,
        _bpmn: &BusinessProcessModelAndNotation,
    ) -> Result<()> {
        Ok(())
    }
}

impl BPMNObject for BPMNMessageEndEvent {
    fn local_index(&self) -> usize {
        self.local_index
    }

    fn global_index(&self) -> GlobalIndex {
        self.global_index
    }

    fn activity(&self) -> Option<Activity> {
        None
    }

    fn id(&self) -> &str {
        &self.id
    }

    fn is_unconstrained_start_event(
        &self,
        _bpmn: &BusinessProcessModelAndNotation,
    ) -> Result<bool> {
        Ok(false)
    }

    fn is_end_event(&self) -> bool {
        true
    }

    fn incoming_sequence_flows(&self) -> &[usize] {
        &self.incoming_sequence_flows
    }

    fn outgoing_sequence_flows(&self) -> &[usize] {
        &EMPTY_FLOWS
    }

    fn incoming_message_flows(&self) -> &[usize] {
        &EMPTY_FLOWS
    }

    fn outgoing_message_flows(&self) -> &[usize] {
        self.outgoing_message_flow.as_slice()
    }

    fn can_start_process_instance(&self, _bpmn: &BusinessProcessModelAndNotation) -> Result<bool> {
        Ok(self.incoming_sequence_flows().len() == 0)
    }

    fn outgoing_message_flows_always_have_tokens(&self) -> bool {
        false
    }

    fn outgoing_messages_cannot_be_removed(&self) -> bool {
        false
    }

    fn incoming_messages_are_ignored(&self) -> bool {
        false
    }

    fn can_have_incoming_sequence_flows(&self) -> bool {
        true
    }

    fn can_have_outgoing_sequence_flows(&self) -> bool {
        false
    }
}

impl Transitionable for BPMNMessageEndEvent {
    fn number_of_transitions(&self, _marking: &BPMNSubMarking) -> usize {
        number_of_transitions_xor_join_only!(self)
    }

    fn enabled_transitions(
        &self,
        _root_marking: &BPMNRootMarking,
        sub_marking: &BPMNSubMarking,
        _parent: &dyn Processable,
        _bpmn: &BusinessProcessModelAndNotation,
    ) -> Result<BitVec> {
        Ok(enabledness_xor_join_only!(self, sub_marking))
    }

    fn execute_transition(
        &self,
        transition_index: TransitionIndex,
        root_marking: &mut BPMNRootMarking,
        sub_marking: &mut BPMNSubMarking,
        _parent: &dyn Processable,
        bpmn: &BusinessProcessModelAndNotation,
    ) -> Result<()> {
        //consume
        execute_transition_xor_join_consume!(self, sub_marking, transition_index);

        //produce
        execute_transition_message_produce!(self, root_marking, bpmn);

        Ok(())
    }

    fn transition_activity(
        &self,
        _transition_index: TransitionIndex,
        _marking: &BPMNSubMarking,
    ) -> Option<Activity> {
        None
    }

    fn transition_debug(
        &self,
        transition_index: TransitionIndex,
        _marking: &BPMNSubMarking,
        _bpmn: &BusinessProcessModelAndNotation,
    ) -> Option<String> {
        Some(format!(
            "message end event `{}`; internal transition {}",
            self.id, transition_index
        ))
    }

    fn transition_probabilistic_penalty(
        &self,
        _transition_index: TransitionIndex,
        _marking: &BPMNSubMarking,
        _parent: &dyn Processable,
    ) -> Option<Fraction> {
        Some(Fraction::one())
    }

    fn transition_2_consumed_tokens<'a>(
        &'a self,
        transition_index: TransitionIndex,
        _marking: &BPMNRootMarking,
        _sub_marking: &BPMNSubMarking,
        parent: &'a dyn Processable,
        _bpmn: &BusinessProcessModelAndNotation,
    ) -> Result<Vec<Token>> {
        Ok(task_consumed_tokens!(self, transition_index, parent))
    }

    fn transition_2_produced_tokens(
        &self,
        _transition_index: TransitionIndex,
        _root_marking: &BPMNRootMarking,
        _sub_marking: &BPMNSubMarking,
        _parent: &dyn Processable,
        bpmn: &BusinessProcessModelAndNotation,
    ) -> Result<Vec<Token>> {
        Ok(transition_2_produced_tokens_message!(self, bpmn))
    }
}