From f3e3960ea1f8b4594fe42dac11eaab618e06c0b1 Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Thu, 3 Dec 2020 21:22:52 -0800
Subject: [PATCH] Add initial file after solving day 4.

---
 day4.cr | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 day4.cr

diff --git a/day4.cr b/day4.cr
new file mode 100644
index 0000000..aa365c6
--- /dev/null
+++ b/day4.cr
@@ -0,0 +1,84 @@
+INPUT = File.read("day4.txt").lines.map(&.chomp) 
+
+def part1
+  input = INPUT.clone
+  passlines = [] of Array(String)
+  currpass = [] of String
+  input.each do |line|
+    if line.empty?
+      passlines << currpass
+      currpass = [] of String
+      next
+    end
+    currpass << line
+  end
+  passlines << currpass
+
+  total = 0
+  passlines.each do |pass|
+    fields = pass.join(" ").split(" ")
+    puts fields
+    values = {} of String => String
+    fields.each do |field|
+      key = field.split(":")[0]
+      values[key] = field.split(":")[1]
+      puts "#{key}: #{values[key]}"
+    end
+
+    next unless value = values["byr"]?
+    value = value.to_i32
+    next unless value >= 1920 && value <= 2002
+
+    puts "byr"
+
+    next unless value = values["iyr"]?
+    value = value.to_i32
+    next unless value >= 2010 && value <= 2020
+  
+    puts "iry"
+
+    next unless value = values["eyr"]?
+    value = value.to_i32
+    next unless value >= 2020 && value <= 2030
+
+    puts "eyr"
+
+    next unless value = values["hgt"]?
+    next unless value.ends_with?("cm") || value.ends_with?("in")
+    ivalue = value[0..-3].to_i32
+    if value.ends_with? "cm"
+      next unless ivalue >= 150 && ivalue <= 193
+    else
+      next unless ivalue >= 59 && ivalue <= 76
+    end
+
+    puts "hgt"
+
+    next unless value = values["hcl"]?
+    next unless value[0] == '#' && (value[1..]).to_i32(16)
+
+    puts "hcl"
+
+    next unless value = values["ecl"]?
+    next unless "amb blu brn gry grn hzl oth".split(" ").includes? value
+
+    puts "ecl"
+
+    next unless value = values["pid"]?
+    puts value
+    next unless value.size == 9
+    next unless value = value.to_i32?
+
+    puts "pid"
+
+    total += 1
+  end
+  puts total
+end
+
+def part2
+  input = INPUT.clone
+end
+
+part1
+part2