use chrono::{DateTime, Utc};
use getset::Getters;

#[derive(Clone, Debug, Getters)]
#[getset(get = "pub")]
pub struct RecurrenceRule {
    frequency: Frequency,
    interval: u32,
    end_date: Option<DateTime<Utc>>
}

#[derive(Clone, Debug)]
pub enum Frequency {
    DAILY,
    WEEKLY,
    MONTHLY,
    YEARLY
}

impl RecurrenceRule {
    pub fn new(
        frequency: Frequency,
        interval: u32,
        end_date: Option<DateTime<Utc>>
    ) -> Result<Self, String> {
        let now = Utc::now();

        if let Some(end) = end_date {
            if now >= end {
                return Err("End date has already passed".to_string());
            }
        }

        Ok(Self { frequency, interval, end_date })
    }
}