From de8d7a812c4da9f0375dc47626c0e836ba728207 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Sat, 21 May 2022 00:26:44 +0200
Subject: Find start and end dates in Reader

---
 Reader.cpp | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/Reader.cpp b/Reader.cpp
index 07cb175..f14b837 100644
--- a/Reader.cpp
+++ b/Reader.cpp
@@ -1,6 +1,8 @@
 #include "Reader.h"
 
+#include <ctime>
 #include <vector>
+#include <limits>
 
 #include "Grid.h"
 #include "LongVector3.h"
@@ -14,13 +16,19 @@ static constexpr long double EXTENT {1000 * 50000};
 
 
 static Grid& find_grid_for(std::vector<Grid>& grids, const LongVector3& position);
+static std::tm end_of_time();
+static bool earlier(const std::tm& lhs, const std::tm& rhs);
 
 
 std::vector<Grid>
 Reader::read(Source& source)
 {
     std::vector<Grid> grids;
+    std::tm start = end_of_time();
+    std::tm end = {};
     for (auto& km : source.killmails()) {
+        if (earlier(km.time, start)) start = km.time;
+        if (earlier(end, km.time)) end = km.time;
         auto& grid = find_grid_for(grids, km.position);
         grid.wrecks.push_back(Wreck{Vector3{0, 0, 0}, km});
     }
@@ -44,6 +52,8 @@ Reader::read(Source& source)
         }
         grid.origin = average;
     }
+    (void) start;
+    (void) end;
     return grids;
 }
 
@@ -58,3 +68,36 @@ find_grid_for(std::vector<Grid>& grids, const LongVector3& position)
     grids.push_back(Grid{});
     return grids.back();
 }
+
+
+std::tm
+end_of_time()
+{
+    std::tm time {};
+    time.tm_sec = 60;
+    time.tm_min = 59;
+    time.tm_hour = 23;
+    time.tm_mday = 31;
+    time.tm_mon = 11;
+    time.tm_year = std::numeric_limits<decltype(time.tm_year)>::max();
+    return time;
+}
+
+
+bool
+earlier(const std::tm& lhs, const std::tm& rhs)
+{
+    if (lhs.tm_year > rhs.tm_year) return false;
+    if (lhs.tm_year < rhs.tm_year) return true;
+    if (lhs.tm_mon > rhs.tm_mon) return false;
+    if (lhs.tm_mon < rhs.tm_mon) return true;
+    if (lhs.tm_mday > rhs.tm_mday) return false;
+    if (lhs.tm_mday < rhs.tm_mday) return true;
+    if (lhs.tm_hour > rhs.tm_hour) return false;
+    if (lhs.tm_hour < rhs.tm_hour) return true;
+    if (lhs.tm_min > rhs.tm_min) return false;
+    if (lhs.tm_min < rhs.tm_min) return true;
+    if (lhs.tm_sec > rhs.tm_sec) return false;
+    if (lhs.tm_sec < rhs.tm_sec) return true;
+    return false;
+}
-- 
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