From 458a24d09f95eefb161728d9676ecdfca30e3f5e Mon Sep 17 00:00:00 2001
From: xengineering <me@xengineering.eu>
Date: Sun, 8 Sep 2024 17:02:33 +0200
Subject: Split flow.py to simulate.py and model.py

model.py should be a file containing only dataclasses to model finance.
simulate.py should take care of the simulation of that finance data to
create a financial forecast.
---
 finance/flow.py | 66 ---------------------------------------------------------
 1 file changed, 66 deletions(-)
 delete mode 100644 finance/flow.py

(limited to 'finance/flow.py')

diff --git a/finance/flow.py b/finance/flow.py
deleted file mode 100644
index c6b28c0..0000000
--- a/finance/flow.py
+++ /dev/null
@@ -1,66 +0,0 @@
-import dataclasses
-from datetime import datetime
-from decimal import Decimal
-from typing import Generator
-
-
-@dataclasses.dataclass(kw_only=True, frozen=True)
-class Flow:
-    """Time-discrete flow of money paid on the first day of a month"""
-
-    amount: Decimal
-    since: None | datetime
-    until: None | datetime
-
-    def integrate(self, start: datetime, end: datetime) -> Decimal:
-        """Integrate the flow between two dates to an amount of money"""
-
-        payments: int = 0
-
-        if self.since is not None:
-            if start < self.since:
-                start = self.since
-
-        if self.until is not None:
-            if end > self.until:
-                end = self.until
-
-        for candidate in monthly_candidates(start):
-            if start <= candidate <= end:
-                payments += 1
-            if candidate > end:
-                break
-
-        return self.amount * Decimal(payments)
-
-
-def monthly_candidates(start: datetime) -> Generator[datetime, None, None]:
-    current = datetime(start.year, start.month, 1)
-    while True:
-        yield current
-        if current.month == 12:
-            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, ...]
-) -> list[tuple[datetime, 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 [(date, values[index]) for index, date in enumerate(dates)]
-- 
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