using System;
using System.Windows.Forms;
using System.IO;
using System.Text.RegularExpressions;
using System.Text;

class Script
{
    /// <summary>
    /// This script will write a Text file containing all the Biml Script Locations/Names/Descriptions.
    /// 
    /// The Description is pulled from an annotation in the format
    /// <#@ annotation annotationtype="Description" tag="Summary" text="<Description>" #>
    /// </summary>
    /// <param name="args">The args.</param>
	[STAThread]
	static public void Main(string[] args)
	{
        // Location to dump the output.
        var outputPath = @"C:\Temp\BimlScriptDocumentation.txt";

        // Set up the location where the Biml Scripts live.
        var edw3Trunk = Environment.GetEnvironmentVariable("BFG_BI_EDW3_TRUNK", EnvironmentVariableTarget.Machine);
        var bimlScriptPath = Path.Combine(edw3Trunk, "Framework", "BimlScripts");
        StringBuilder output = new StringBuilder();

        // Output the table header
        output.AppendFormat("||{0}||{1}||{2}||\r\n", "Path", "Script", "Description");
            
        // Loop over all the Biml files
        foreach(var file in Directory.GetFiles(bimlScriptPath, "*.biml", SearchOption.AllDirectories))
        {
            string relativePath = Path.GetDirectoryName(file).Remove(0, bimlScriptPath.Length+1);
            string scriptName = Path.GetFileNameWithoutExtension(file);
            string scriptContents = File.ReadAllText(file);
            string scriptDocumentation = " "; // Important!  Required for the table to format correctly.

            // Get the first "Description" annotation in the file (if one exists).
            string annotationRegex = "<\\#@(?:\\s+)annotation(?:\\s+)annotationtype=\"Description\"(?:\\s+)tag=\"Summary\"(?:\\s+)text=\"(.*?)\"(?:\\s+)\\#>";
            RegexOptions options = ((RegexOptions.IgnorePatternWhitespace | RegexOptions.Multiline) | RegexOptions.IgnoreCase);
            Regex reg = new Regex(annotationRegex, options);

            var groupCollection = reg.Match(scriptContents).Groups;

            if (groupCollection.Count >= 2)
            {
                scriptDocumentation = groupCollection[1].Value.ToString();
            }

            // Output the table row
            output.AppendFormat("|{0}|{1}|{2}|\r\n", relativePath, scriptName, scriptDocumentation);
        }

        // Write the output to a file; it's hard to get from the console.
        if (File.Exists(outputPath))
        {
            File.Delete(outputPath);
        }

        File.WriteAllText(outputPath, output.ToString());
	}
}