2026年本格始動「SCS評価制度（★3・★4）」
重要26項目と、業種別・実践チェックリスト

#![forbid(unsafe_code)]

pub const SCS_STAR3_TOTAL_CONTROLS: u32 = 26;
pub const SCS_STAR3_FULL_MASK: u32 = (1u32 << SCS_STAR3_TOTAL_CONTROLS) - 1;

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct ScsStar3State {
    pub satisfied_bitmask: u32,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct ScsAuditSummary {
    pub satisfied_count: u32,
    pub missing_count: u32,
    pub completion_percent: u8,
    pub is_star3_compliant: bool,
}

impl ScsStar3State {
    #[inline]
    pub const fn new(raw_mask: u32) -> Self {
        Self {
            satisfied_bitmask: raw_mask & SCS_STAR3_FULL_MASK,
        }
    }

    #[inline]
    pub const fn mark_control_satisfied(&mut self, index_0_to_25: u32) {
        if index_0_to_25 < SCS_STAR3_TOTAL_CONTROLS {
            self.satisfied_bitmask |= 1u32 << index_0_to_25;
        }
    }

    #[inline]
    pub const fn evaluate(&self) -> ScsAuditSummary {
        let satisfied = self.satisfied_bitmask.count_ones();
        let missing = SCS_STAR3_TOTAL_CONTROLS.saturating_sub(satisfied);
        let pct = ((satisfied * 100) / SCS_STAR3_TOTAL_CONTROLS) as u8;
        ScsAuditSummary {
            satisfied_count: satisfied,
            missing_count: missing,
            completion_percent: pct,
            is_star3_compliant: satisfied == SCS_STAR3_TOTAL_CONTROLS,
        }
    }
}

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

    #[test]
    fn full_26_bits_achieves_star3_compliance() {
        let state = ScsStar3State::new(SCS_STAR3_FULL_MASK);
        let summary = state.evaluate();
        assert!(summary.is_star3_compliant);
        assert_eq!(summary.satisfied_count, 26);
        assert_eq!(summary.completion_percent, 100);
    }
}