fish_lib/game/services/
specimen_service.rs

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use crate::game::errors::repository::GameRepositoryError;
use crate::game::errors::resource::GameResourceError;
use crate::game::repositories::specimen_repository::SpecimenRepository;
use crate::game::services::fishing_history_service::FishingHistoryService;
use crate::models::fishing_history_entry::FishingHistoryEntry;
use crate::models::specimen::{NewSpecimen, Specimen};
use crate::models::user::User;
use crate::traits::repository::Repository;
use std::error::Error;

pub struct SpecimenService;

impl SpecimenService {
    pub fn generate_and_save_specimen(
        owner_user: &User,
        species_id: i32,
    ) -> Result<Specimen, Box<dyn Error>> {
        let new_fish = NewSpecimen::generate(owner_user.id, species_id)?;
        match SpecimenRepository::create(new_fish) {
            Ok(specimen) => Ok(specimen),
            Err(e) => match e.downcast_ref::<GameRepositoryError>() {
                Some(repository_error)
                    if repository_error.is_foreign_key_violation_user_not_found() =>
                {
                    Err(GameResourceError::user_not_found(owner_user.external_id).into())
                }
                _ => Err(e),
            },
        }
    }

    pub fn process_catch(
        user: &User,
        species_id: i32,
    ) -> Result<(Specimen, FishingHistoryEntry), Box<dyn Error>> {
        let fish = Self::generate_and_save_specimen(user, species_id)?;
        let history_entry = FishingHistoryService::register_catch(&fish)?;
        Ok((fish, history_entry))
    }
}