From 433bfefa7d2296338648beccb17dd3bf9a4903db Mon Sep 17 00:00:00 2001
From: Martin Brodbeck <martin@brodbeck-online.de>
Date: Wed, 11 Jan 2023 12:02:17 +0100
Subject: [PATCH 1/2] code cleanup

---
 src/utils.cpp | 1 -
 src/utils.h   | 2 +-
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/utils.cpp b/src/utils.cpp
index 5584cb0..fbea4a1 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -6,7 +6,6 @@
 
 #include "pico/sleep.h"
 #include "pico/stdlib.h"
-// #include "stdlib.h"
 #include "hardware/clocks.h"
 #include "hardware/rosc.h"
 #include "hardware/structs/scb.h"
diff --git a/src/utils.h b/src/utils.h
index f7c9d2c..56702a1 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -33,6 +33,6 @@ void recover_from_sleep(uint scb_orig, uint clock0_orig, uint clock1_orig);
 
 void perform_sleep(datetime_t &untilDt);
 
-//void add_one_day(datetime_t &dt);
+void add_one_day(datetime_t &dt);
 
 void add_one_hour(datetime_t &dt);
\ No newline at end of file

From e9ce09a02959c0631108a2adcd0d230b49d05611 Mon Sep 17 00:00:00 2001
From: Martin Brodbeck <martin@brodbeck-online.de>
Date: Wed, 11 Jan 2023 12:40:21 +0100
Subject: [PATCH 2/2] get rid of xhrono

---
 src/abfall.cpp | 12 ++++++------
 src/utils.cpp  | 43 ++++++++++++++++++++++++++++++++++++-------
 src/utils.h    |  3 +--
 3 files changed, 43 insertions(+), 15 deletions(-)

diff --git a/src/abfall.cpp b/src/abfall.cpp
index c4b21e9..9464034 100644
--- a/src/abfall.cpp
+++ b/src/abfall.cpp
@@ -1,7 +1,6 @@
 #include <cstdio>
 
 #include <algorithm>
-#include <chrono>
 #include <iostream>
 #include <string>
 
@@ -83,11 +82,12 @@ int main() {
 
         rtc_get_datetime(&dt);
 
-        chrono::year_month_day tomorrowYMD(chrono::year{dt.year},
-                                           chrono::month{static_cast<unsigned>(dt.month)},
-                                           chrono::day{static_cast<unsigned>(dt.day + 1)});
-        auto it = std::find_if(dates.begin(), dates.end(), [&tomorrowYMD](const WasteDate &date) {
-            return date.date == tomorrowYMD;
+        datetime_t tomorrowYMD = dt;
+        add_one_day(tomorrowYMD);
+
+        auto it = std::find_if(dates.begin(), dates.end(), [&tomorrowYMD](const WasteDate &x) {
+            return tomorrowYMD.year == x.date.year && tomorrowYMD.month == x.date.month &&
+                   tomorrowYMD.day == x.date.day;
         });
 
         int8_t hour = isDST(dt) ? dt.hour + 1 : dt.hour;
diff --git a/src/utils.cpp b/src/utils.cpp
index fbea4a1..9c8caf2 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -1,14 +1,16 @@
 #include "utils.h"
 
+#include <cmath>
+
 #include <algorithm>
 #include <iostream>
 #include <sstream>
 
-#include "pico/sleep.h"
-#include "pico/stdlib.h"
 #include "hardware/clocks.h"
 #include "hardware/rosc.h"
 #include "hardware/structs/scb.h"
+#include "pico/sleep.h"
+#include "pico/stdlib.h"
 
 using namespace std;
 
@@ -35,17 +37,42 @@ bool isDST(const datetime_t &dt) {
     return previousSunday < 25;
 }
 
-chrono::year_month_day stringToDate(const std::string &dateStr) {
+int8_t calcDotw(int year, int month, int day) {
+    int mon;
+    if (month > 2)
+        mon = month; // for march to december month code is same as month
+    else {
+        mon = (12 + month); // for Jan and Feb, month code will be 13 and 14
+        year--;             // decrease year for month Jan and Feb
+    }
+    int y = year % 100; // last two digit
+    int c = year / 100; // first two digit
+    int w = (day + floor((13 * (mon + 1)) / 5) + y + floor(y / 4) + floor(c / 4) - (2 * c));
+    w = (w % 7) - 1;
+    return w;
+}
+
+datetime_t stringToDate(const std::string &dateStr) {
     istringstream partss(dateStr);
     string day_str, month_str, year_str;
+
     getline(partss, day_str, '.');
     getline(partss, month_str, '.');
     getline(partss, year_str, '.');
+
     int day = atoi(day_str.c_str());
     int month = atoi(month_str.c_str());
     int year = atoi(year_str.c_str());
-    chrono::year_month_day date{chrono::year{year}, chrono::month{(uint)month},
-                                chrono::day{(uint)day}};
+
+    datetime_t date;
+    date.year = year;
+    date.month = month;
+    date.day = day;
+    date.dotw = calcDotw(year, month, day);
+    date.hour = 0;
+    date.min = 0;
+    date.sec = 0;
+
     return date;
 }
 
@@ -82,8 +109,10 @@ std::vector<WasteDate> parseCsv(const std::string &csv) {
 
             // Take existing date or create a new one.
             std::vector<WasteDate>::iterator it;
-            it = std::find_if(wasteDates.begin(), wasteDates.end(),
-                              [&date](const WasteDate &x) { return date == x.date; });
+            it = std::find_if(wasteDates.begin(), wasteDates.end(), [&date](const WasteDate &x) {
+                return date.year == x.date.year && date.month == x.date.month &&
+                       date.day == x.date.day;
+            });
             if (it == wasteDates.end()) {
                 WasteDate wd;
                 wd.date = date;
diff --git a/src/utils.h b/src/utils.h
index 56702a1..bfce9c4 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -1,6 +1,5 @@
 #pragma once
 
-#include <chrono>
 #include <string>
 #include <vector>
 
@@ -15,7 +14,7 @@ enum class Waste {
 };
 
 struct WasteDate {
-    std::chrono::year_month_day date;
+    datetime_t date;
     std::vector<Waste> wasteTypes;
 };