From 51a23be744fb922d5d7003d999a74d4efcda9782 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Gr=C3=A9gory=20Burri?= <gregory.burri@matisa.ch>
Date: Tue, 4 Dec 2018 16:20:35 +0100
Subject: [PATCH] Beginning of day 4.

---
 AdventOfCode2018.fsproj |  4 ++++
 Day04.fs                | 53 +++++++++++++++++++++++++++++++++++++++++
 Program.fs              |  7 ++++--
 Tests/Day04 tests.fs    | 44 ++++++++++++++++++++++++++++++++++
 Tests/Tests.fsproj      |  1 +
 5 files changed, 107 insertions(+), 2 deletions(-)
 create mode 100644 Day04.fs
 create mode 100644 Tests/Day04 tests.fs

diff --git a/AdventOfCode2018.fsproj b/AdventOfCode2018.fsproj
index 66bd76c..87b4c6f 100644
--- a/AdventOfCode2018.fsproj
+++ b/AdventOfCode2018.fsproj
@@ -4,10 +4,14 @@
     <TargetFramework>netcoreapp2.1</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
+    <Compile Include="Day04.fs" />
     <Compile Include="Day03.fs" />
     <Compile Include="Day02.fs" />
     <Compile Include="Day01.fs" />
     <Compile Include="Program.fs" />
+    <Content Include="Data/day04.input">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
     <Content Include="Data/day03.input">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
diff --git a/Day04.fs b/Day04.fs
new file mode 100644
index 0000000..c3f2ee6
--- /dev/null
+++ b/Day04.fs
@@ -0,0 +1,53 @@
+module AdventOfCode2018.Day04
+
+open System
+
+let parseInput (str : string) : string =
+    let shifts : int list array = Array.create 60 []
+
+    let addShift (id : int) (date1 : DateTime) (date2 : DateTime) =
+
+        let min1 = if date1.Hour > 0 then 0 else date1.Minute
+        let min2 = if date2.Hour > 0 then 59 else date2.Minute
+
+        for m = min1 to min2 - 1 do
+            shifts.[m] <- id :: shifts.[m]
+
+    let lines =
+        str.Split ([| '\r'; '\n'; |], StringSplitOptions.RemoveEmptyEntries)
+        |> Array.choose (
+            fun line ->
+                let trimmed = line.Trim ()
+                if trimmed = "" then None else Some (DateTime.Parse (trimmed.Substring (1, 16)), trimmed)
+        )
+        |> Array.sortBy fst
+        (*
+        |> Array.fold (
+            fun id (dateTime, line) ->
+                match line.IndexOf '#' with
+                | i when i <> -1 -> line.Substring (i + 1, line.IndexOf (' ', i) - i - 1) |> int
+                | _ ->
+        ) 0*)
+
+    let mutable id = 0
+
+    for i = 0 to lines.Length - 1 do
+        let dateTime, line = lines.[i]
+        match line.IndexOf '#' with
+        | i when i <> -1 -> id <- line.Substring (i + 1, line.IndexOf (' ', i) - i - 1) |> int
+        | _ ->
+            if line.Contains "wakes up" then
+                addShift id (fst lines.[i-1]) dateTime
+
+    sprintf "%A" shifts
+
+
+
+
+
+
+
+    //Map<int, int>.
+
+
+    //
\ No newline at end of file
diff --git a/Program.fs b/Program.fs
index 1fe631b..346eb36 100644
--- a/Program.fs
+++ b/Program.fs
@@ -17,11 +17,16 @@ let day03 () =
     let surface, claimId = Day03.overlappingSurface claims
     sprintf "part1 = %A, part2 = %A"  surface claimId
 
+let day04 () =
+    // sprintf "part1 = %A, part2 = %A"  surface claimId
+    ""
+
 let days : Map<int, unit -> string> =
     [
         1, day01
         2, day02
         3, day03
+        4, day04
     ] |> Map.ofList
 
 let doDay (n : int) =
@@ -48,6 +53,4 @@ let main argv =
     else
         for day in days do
             doDay day.Key
-
-    Console.Read () |> ignore
     0
diff --git a/Tests/Day04 tests.fs b/Tests/Day04 tests.fs
new file mode 100644
index 0000000..b952e14
--- /dev/null
+++ b/Tests/Day04 tests.fs	
@@ -0,0 +1,44 @@
+namespace AdventOfCode2018.Tests
+
+open System
+
+open Xunit
+open Xunit.Abstractions
+open Swensen.Unquote
+
+open AdventOfCode2018
+
+type ``Day04 tests`` (output : ITestOutputHelper) =
+
+    [<Fact>]
+    let ``(Part1) From web page`` () =
+        let input =
+            """
+                [1518-11-01 00:00] Guard #10 begins shift
+                [1518-11-01 00:05] falls asleep
+                [1518-11-01 00:25] wakes up
+                [1518-11-01 00:30] falls asleep
+                [1518-11-01 00:55] wakes up
+                [1518-11-01 23:58] Guard #99 begins shift
+                [1518-11-02 00:40] falls asleep
+                [1518-11-02 00:50] wakes up
+                [1518-11-03 00:05] Guard #10 begins shift
+                [1518-11-03 00:24] falls asleep
+                [1518-11-03 00:29] wakes up
+                [1518-11-04 00:02] Guard #99 begins shift
+                [1518-11-04 00:36] falls asleep
+                [1518-11-04 00:46] wakes up
+                [1518-11-05 00:03] Guard #99 begins shift
+                [1518-11-05 00:45] falls asleep
+                [1518-11-05 00:55] wakes up
+            """
+
+        output.WriteLine (Day04.parseInput input)
+
+        1 =! 2
+        ()
+
+    [<Fact>]
+    let ``(Part2) From web page`` () =
+        ()
+
diff --git a/Tests/Tests.fsproj b/Tests/Tests.fsproj
index 7ed0d16..f239854 100644
--- a/Tests/Tests.fsproj
+++ b/Tests/Tests.fsproj
@@ -6,6 +6,7 @@
     <ProjectReference Include="..\AdventOfCode2018.fsproj" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Day04 tests.fs" />
     <Compile Include="Day03 tests.fs" />
     <Compile Include="Day02 tests.fs" />
     <Compile Include="Day01 tests.fs" />
-- 
2.45.2