From 3b16f04f4f3c6085ffef2ac058fca0a17fcb49ca Mon Sep 17 00:00:00 2001
From: Frederick Yin <fkfd@fkfd.me>
Date: Fri, 22 Oct 2021 22:06:08 +0800
Subject: Routines, to be run at an interval

---
 jimbrella/routine.py | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 jimbrella/routine.py

diff --git a/jimbrella/routine.py b/jimbrella/routine.py
new file mode 100644
index 0000000..784b60c
--- /dev/null
+++ b/jimbrella/routine.py
@@ -0,0 +1,68 @@
+from .database import Database
+from .jform import JForm
+from .config import *
+from .exceptions import *
+
+"""A set of routine methods, run at an interval (somewhere from ten minutes to one hour), to:
+- sync JImbrella's databse against data pulled from jForm
+- check if any umbrella is now overdue
+- send an SMS where applicable, to a user or an admin
+"""
+
+
+def chronological_merge(*sheet_lists) -> list:
+    """Merges all lists answer sheets passed in, in chronological order, into a single list.
+
+    All lists of sheets in sheet_lists MUST be already in chronological order.
+    By "chronological", we mean sorting by the value under key "date".
+    """
+    chronicle = []
+    while any(sheet_lists):  # at least one list in `sheet_lists` is non-empty
+        # for each list of sheets, read date from its first element, then find the earliest
+        # is an instance of datetime.datetime
+        # only pass non-empty lists to min():
+        earliest_date = min(
+            [sheet_list[0]["date"] for sheet_list in filter(None, sheet_lists)]
+        )
+        for idx, sheet_list in enumerate(sheet_lists):
+            if not sheet_list:  # is empty
+                continue
+            if sheet_list[0]["date"] == earliest_date:
+                # remove the first element and append it to `chronicle`, if it is the earliest
+                chronicle.append(sheet_lists[idx].pop(0))
+                # we do not directly break here because there exists a tiny chance
+                # two answer sheets were submitted at the exact same millisecond
+    return chronicle
+
+
+def sync_database(takeaway: JForm, giveback: JForm, db: Database):
+    takeaway_unread = takeaway.get_unread()
+    giveback_unread = giveback.get_unread()
+    unread = chronological_merge(takeaway_unread, giveback_unread)
+    for sheet in unread:
+        if sheet["jform_name"] == "takeaway":
+            try:
+                db.take_away(
+                    sheet["key"], sheet["date"], sheet["name"], sheet["id"], sheet["phone"]
+                )
+            except UmbrellaStatusError:
+                pass
+            except UmbrellaNotFoundError:
+                pass
+        elif sheet["jform_name"] == "giveback":
+            try:
+                db.give_back(sheet["key"], sheet["date"])
+            except UmbrellaStatusError:
+                pass
+            except UmbrellaNotFoundError:
+                pass
+
+
+if __name__ == "__main__":
+    takeaway = JForm("takeaway", JFORM_TAKEAWAY_URL, JFORM_BOOKMARK_DIR)
+    # giveback = JForm(
+    #     "giveback", JFORM_GIVEBACK_URL, JFORM_BOOKMARK_DIR
+    # )
+    giveback = None
+    db = Database(DATABASE_PATH)
+    sync_database(takeaway, giveback, db)
-- 
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