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use crate::aggregate::{AggregateIdOf, Generation, WithAggregateId};
use crate::event::NewEvent;
use crate::VersionedAggregate;
use serde::{Deserialize, Serialize};
use std::fmt::Debug;

pub type EventOf<H, C, A> = <H as HandleCommand<C, A>>::Event;

pub trait HandleCommand<C, A>
where
    A: WithAggregateId,
{
    type Event;
    type Error: std::error::Error;
    type Context;

    fn handle_command(
        &self,
        command: C,
        context: &Self::Context,
    ) -> Result<Vec<NewEvent<Self::Event, A>>, Self::Error>;
}

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct DomainCommand<C, A>
where
    A: WithAggregateId,
{
    pub aggregate_id: AggregateIdOf<A>,
    pub aggregate_generation: Generation,
    pub data: C,
}

impl<C, A> From<(C, &VersionedAggregate<A>)> for DomainCommand<C, A>
where
    A: WithAggregateId,
{
    fn from((command, aggregate): (C, &VersionedAggregate<A>)) -> Self {
        Self {
            aggregate_id: aggregate.state().aggregate_id().clone(),
            aggregate_generation: aggregate.generation(),
            data: command,
        }
    }
}

impl<C, A> DomainCommand<C, A>
where
    A: WithAggregateId,
{
    pub fn new(
        aggregate_id: AggregateIdOf<A>,
        aggregate_generation: impl Into<Generation>,
        data: impl Into<C>,
    ) -> Self {
        Self {
            aggregate_id,
            aggregate_generation: aggregate_generation.into(),
            data: data.into(),
        }
    }
}