refactor: restructure domain crate by bounded context

crates/domain/src/storage/services.rs

@@ -0,0 +1,73 @@
+use chrono::{Datelike, NaiveDate, TimeZone, Utc};
+use super::entities::{QuotaDefinition, TimePeriod, UsageType};
+use crate::common::value_objects::DateTimeStamp;
+
+pub struct QuotaCheckResult {
+    pub allowed: bool,
+    pub current_usage: u64,
+    pub limit: u64,
+    pub is_unlimited: bool,
+}
+
+pub fn check_quota(
+    quota: &QuotaDefinition,
+    usage_type: UsageType,
+    current_usage: u64,
+    requested_amount: u64,
+) -> QuotaCheckResult {
+    if !quota.is_enforced {
+        return QuotaCheckResult {
+            allowed: true,
+            current_usage,
+            limit: 0,
+            is_unlimited: true,
+        };
+    }
+
+    let rule = quota.rules.iter().find(|r| r.dimension == usage_type);
+    let Some(rule) = rule else {
+        return QuotaCheckResult {
+            allowed: true,
+            current_usage,
+            limit: 0,
+            is_unlimited: true,
+        };
+    };
+
+    if rule.is_unlimited {
+        return QuotaCheckResult {
+            allowed: true,
+            current_usage,
+            limit: 0,
+            is_unlimited: true,
+        };
+    }
+
+    QuotaCheckResult {
+        allowed: current_usage + requested_amount <= rule.limit_value,
+        current_usage,
+        limit: rule.limit_value,
+        is_unlimited: false,
+    }
+}
+
+pub fn period_start(period: TimePeriod) -> Option<DateTimeStamp> {
+    let now = Utc::now();
+    match period {
+        TimePeriod::Daily => {
+            let start = NaiveDate::from_ymd_opt(now.year(), now.month(), now.day())
+                .expect("valid date")
+                .and_hms_opt(0, 0, 0)
+                .expect("valid time");
+            Some(DateTimeStamp::from_datetime(Utc.from_utc_datetime(&start)))
+        }
+        TimePeriod::Monthly => {
+            let start = NaiveDate::from_ymd_opt(now.year(), now.month(), 1)
+                .expect("valid date")
+                .and_hms_opt(0, 0, 0)
+                .expect("valid time");
+            Some(DateTimeStamp::from_datetime(Utc.from_utc_datetime(&start)))
+        }
+        TimePeriod::Lifetime => None,
+    }
+}