Implement finance.flow.simulate()

1 files changed, 22 insertions, 0 deletions

diff --git a/finance/flow.py b/finance/flow.py
index 9ea72c8..836c137 100644
--- a/finance/flow.py
+++ b/finance/flow.py
@@ -42,3 +42,25 @@ def monthly_candidates(start: datetime) -> Generator[datetime, None, None]:
             current = datetime(current.year + 1, 1, 1)
         else:
             current = datetime(current.year, current.month + 1, 1)
+
+
+def simulate(
+    start: datetime, end: datetime, flows: tuple[Flow]
+) -> tuple[list[datetime], list[Decimal]]:
+    dates: list[datetime] = []
+    values: list[Decimal] = []
+
+    for candidate in monthly_candidates(start):
+        if start <= candidate <= end:
+            dates.append(candidate)
+
+        if candidate > end:
+            break
+
+    for date in dates:
+        value = Decimal(0.0)
+        for flow in flows:
+            value += flow.integrate(start, date)
+        values.append(value)
+
+    return (dates, values)