cartulary 0.3.0-alpha.1

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Documentation 
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use crate::domain::model::issue::IssueView;
use crate::domain::model::status::StatusesConfig;

use super::helpers::{is_terminal, percentiles};
use super::Percentiles;

pub(super) fn compute_lead_time(
    filtered: &IssueView<'_>,
    statuses: &StatusesConfig,
) -> Option<Percentiles> {
    let mut lt: Vec<f64> = filtered
        .iter()
        .filter(|i| i.status.terminal)
        .filter_map(|i| {
            i.events
                .lead_time(&i.date, is_terminal(statuses))
                .map(|d| d.as_days())
        })
        .collect();
    lt.sort_by(|a, b| a.total_cmp(b));
    percentiles(&lt)
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::domain::model::issue::Issue;
    use crate::domain::model::status::StatusesConfig;
    use crate::domain::usecases::issue::tests::{enrich_issue, feature, ir, IssueFixture};

    // ── Tests ─────────────────────────────────────────────────────────────────

    #[test]
    fn returns_none_when_no_closed_issues() {
        scenario()
            .given(feature("Open").status("open").date("2026-03-01"))
            .when_lead_time()
            .then_none();
    }

    #[test]
    fn computes_percentiles_from_closed_issues() {
        // 3 issues closed after 4, 8, 12 days respectively
        scenario()
            .given(
                feature("T1")
                    .status("closed")
                    .with_timestamped_event("2026-03-01T00:00:00Z", "created", None, None)
                    .with_timestamped_event(
                        "2026-03-05T00:00:00Z",
                        "status_changed",
                        Some("open"),
                        Some("closed"),
                    ),
            )
            .given(
                feature("T2")
                    .status("closed")
                    .with_timestamped_event("2026-03-01T00:00:00Z", "created", None, None)
                    .with_timestamped_event(
                        "2026-03-09T00:00:00Z",
                        "status_changed",
                        Some("open"),
                        Some("closed"),
                    ),
            )
            .given(
                feature("T3")
                    .status("closed")
                    .with_timestamped_event("2026-03-01T00:00:00Z", "created", None, None)
                    .with_timestamped_event(
                        "2026-03-13T00:00:00Z",
                        "status_changed",
                        Some("open"),
                        Some("closed"),
                    ),
            )
            .when_lead_time()
            .then_percentiles(8.0, 12.0, 12.0);
    }

    #[test]
    fn open_issues_are_excluded() {
        scenario()
            .given(
                feature("Closed")
                    .status("closed")
                    .with_timestamped_event("2026-03-01T00:00:00Z", "created", None, None)
                    .with_timestamped_event(
                        "2026-03-05T00:00:00Z",
                        "status_changed",
                        Some("open"),
                        Some("closed"),
                    ),
            )
            .given(feature("Open").status("open").date("2026-03-01"))
            .when_lead_time()
            .then_p50(4.0);
    }

    // ── Scenario DSL ──────────────────────────────────────────────────────────

    struct Scenario {
        issues: Vec<Issue>,
    }

    fn scenario() -> Scenario {
        Scenario { issues: vec![] }
    }

    impl Scenario {
        fn given(mut self, fixture: IssueFixture) -> Self {
            let id = self.issues.len() as u64 + 1;
            let mut issue = fixture.build(ir(id));
            enrich_issue(&mut issue, &StatusesConfig::default_issue());
            self.issues.push(issue);
            self
        }

        fn when_lead_time(self) -> LeadTimeOutcome {
            let refs = IssueView::from_slice(&self.issues);
            let result = compute_lead_time(&refs, &StatusesConfig::default_issue());
            LeadTimeOutcome { result }
        }
    }

    struct LeadTimeOutcome {
        result: Option<Percentiles>,
    }

    impl LeadTimeOutcome {
        fn then_none(self) -> Self {
            assert!(self.result.is_none(), "expected None, got Some");
            self
        }

        fn then_p50(self, expected: f64) -> Self {
            let p = self.result.as_ref().expect("expected Some percentiles");
            assert_eq!(p.p50, expected, "p50 mismatch");
            self
        }

        fn then_percentiles(self, p50: f64, p85: f64, p95: f64) -> Self {
            let p = self.result.as_ref().expect("expected Some percentiles");
            assert_eq!(p.p50, p50, "p50 mismatch");
            assert_eq!(p.p85, p85, "p85 mismatch");
            assert_eq!(p.p95, p95, "p95 mismatch");
            self
        }
    }
}