limitdeck 0.1.7

A privacy-safe terminal dashboard for AI subscription limits
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use std::time::{Duration, SystemTime};

#[derive(Clone, Debug, Eq, PartialEq)]
pub struct PlanIdentity {
    pub id: String,
    pub provider_id: String,
    pub display_name: String,
}

impl PlanIdentity {
    pub fn new(
        id: impl Into<String>,
        provider_id: impl Into<String>,
        display_name: impl Into<String>,
    ) -> Self {
        Self {
            id: id.into(),
            provider_id: provider_id.into(),
            display_name: display_name.into(),
        }
    }
}

#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum UsageStatus {
    Available,
    Unavailable,
}

#[derive(Clone, Debug, Eq, PartialEq)]
pub struct UsageWindow {
    pub id: String,
    pub label: String,
    pub period: Option<Duration>,
    pub remaining_percent: u8,
    pub resets_at: Option<SystemTime>,
    pub status: UsageStatus,
}

impl UsageWindow {
    pub fn remaining_time_percent_at(&self, now: SystemTime) -> Option<u8> {
        let period = self.period?;
        let resets_at = self.resets_at?;
        if period.is_zero() {
            return None;
        }

        let remaining = resets_at.duration_since(now).unwrap_or(Duration::ZERO);
        let period_nanos = period.as_nanos();
        let rounded = remaining
            .as_nanos()
            .saturating_mul(100)
            .saturating_add(period_nanos / 2)
            / period_nanos;
        Some(rounded.min(100) as u8)
    }
}

#[derive(Clone, Debug, Eq, PartialEq)]
pub struct CodingPlan {
    pub id: String,
    pub provider_id: String,
    pub display_name: String,
    pub fetched_at: SystemTime,
    pub windows: Vec<UsageWindow>,
}

impl CodingPlan {
    pub fn is_older_than(&self, max_age: Duration) -> bool {
        SystemTime::now()
            .duration_since(self.fetched_at)
            .map(|age| age > max_age)
            .unwrap_or(false)
    }
}

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

    fn window(period: Option<Duration>, resets_at: Option<SystemTime>) -> UsageWindow {
        UsageWindow {
            id: "test".to_owned(),
            label: "Test".to_owned(),
            period,
            remaining_percent: 50,
            resets_at,
            status: UsageStatus::Available,
        }
    }

    #[test]
    fn remaining_time_percent_matches_the_same_remaining_scale_as_quota() {
        let now = SystemTime::UNIX_EPOCH + Duration::from_secs(1_000);
        let period = Duration::from_secs(100);
        assert_eq!(
            window(Some(period), Some(now + Duration::from_secs(50)))
                .remaining_time_percent_at(now),
            Some(50)
        );
        assert_eq!(
            window(Some(period), Some(now - Duration::from_secs(1))).remaining_time_percent_at(now),
            Some(0)
        );
        assert_eq!(
            window(Some(period), Some(now + Duration::from_secs(120)))
                .remaining_time_percent_at(now),
            Some(100)
        );
    }

    #[test]
    fn remaining_time_percent_requires_a_nonzero_period_and_reset_time() {
        let now = SystemTime::UNIX_EPOCH;
        assert_eq!(window(None, Some(now)).remaining_time_percent_at(now), None);
        assert_eq!(
            window(Some(Duration::from_secs(1)), None).remaining_time_percent_at(now),
            None
        );
        assert_eq!(
            window(Some(Duration::ZERO), Some(now)).remaining_time_percent_at(now),
            None
        );
    }
}