From c32bfc35f9048fa1f1c9fd3d60d1b9efeb02519e Mon Sep 17 00:00:00 2001
From: Matt Nadareski <mnadareski@outlook.com>
Date: Sat, 13 Jun 2020 21:24:47 -0700
Subject: [PATCH] Add SeparatedValueWriter

---
 .../Tools/SeparatedValueWriter.cs             | 143 ++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 SabreTools.Library/Tools/SeparatedValueWriter.cs

diff --git a/SabreTools.Library/Tools/SeparatedValueWriter.cs b/SabreTools.Library/Tools/SeparatedValueWriter.cs
new file mode 100644
index 00000000..a7a9f475
--- /dev/null
+++ b/SabreTools.Library/Tools/SeparatedValueWriter.cs
@@ -0,0 +1,143 @@
+using System;
+using System.IO;
+using System.Text;
+
+namespace SabreTools.Library.Tools
+{
+    public class SeparatedValueWriter : IDisposable
+    {
+        /// <summary>
+        /// Internal stream writer for outputting
+        /// </summary>
+        private StreamWriter sw;
+
+        /// <summary>
+        /// Internal value if we've written a header before
+        /// </summary>
+        private bool header = false;
+
+        /// <summary>
+        /// Internal value if we've written our first line before
+        /// </summary>
+        private bool firstRow = false;
+
+        /// <summary>
+        /// Internal value to say how many fields should be written
+        /// </summary>
+        private int fields = -1;
+
+        /// <summary>
+        /// Set if values should be wrapped in quotes
+        /// </summary>
+        public bool Quotes { get; set; } = true;
+
+        /// <summary>
+        /// Set what string should be used as a separator
+        /// </summary>
+        public string Separator { get; set; } = ",";
+
+        /// <summary>
+        /// Set if field count should be verified from the first row
+        /// </summary>
+        public bool VerifyFieldCount { get; set; } = true;
+
+        /// <summary>
+        /// Constructor for writing to a file
+        /// </summary>
+        public SeparatedValueWriter(string filename)
+        {
+            sw = new StreamWriter(filename);
+        }
+
+        /// <summary>
+        /// Consturctor for writing to a stream
+        /// </summary>
+        public SeparatedValueWriter(Stream stream, Encoding encoding)
+        {
+            sw = new StreamWriter(stream, encoding);
+        }
+
+        /// <summary>
+        /// Write a header row
+        /// </summary>
+        public void WriteHeader(string[] headers)
+        {
+            // If we haven't written anything out, we can write headers
+            if (!header && !firstRow)
+                WriteValues(headers);
+
+            header = true;
+        }
+
+        /// <summary>
+        /// Write a value row
+        /// </summary>
+        public void WriteValues(object[] values)
+        {
+            // If the writer can't be used, we error
+            if (sw == null || !sw.BaseStream.CanWrite)
+                throw new ArgumentException(nameof(sw));
+
+            // If the separator character is invalid, we error
+            if (string.IsNullOrEmpty(Separator))
+                throw new ArgumentException(nameof(Separator));
+
+            // If we have the first row, set the bool and the field count
+            if (!firstRow)
+            {
+                firstRow = true;
+                if (VerifyFieldCount && fields == -1)
+                    fields = values.Length;
+            }
+
+            // Get the number of fields to write out
+            int fieldCount = values.Length;
+            if (VerifyFieldCount)
+                fieldCount = Math.Min(fieldCount, fields);
+
+            // Iterate over the fields, writing out each
+            bool firstField = true;
+            for (int i = 0; i < fieldCount; i++)
+            {
+                var value = values[i];
+
+                if (!firstField)
+                    sw.Write(Separator);
+
+                if (Quotes)
+                    sw.Write("\"");
+                sw.Write(value.ToString());
+                if (Quotes)
+                    sw.Write("\"");
+
+                firstField = false;
+            }
+
+            // If we need to pad out the number of fields, add empties
+            if (VerifyFieldCount && values.Length < fields)
+            {
+                for (int i = 0; i < fields - values.Length; i++)
+                {
+                    sw.Write(Separator);
+
+                    if (Quotes)
+                        sw.Write("\"\"");
+                }
+            }
+
+            // Add a newline
+            sw.WriteLine();
+
+            // Flush the buffer
+            sw.Flush();
+        }
+
+        /// <summary>
+        /// Dispose of the underlying writer
+        /// </summary>
+        public void Dispose()
+        {
+            sw.Dispose();
+        }
+    }
+}