using System;
using System.IO;
using System.Text;
using System.Collections.Generic;

namespace AniNIX.Shared {

    public class Configure {

        // This is the file to configure from
        private List<String> lines = new List<String>();

        /// <summary>
        /// Create a new Configure object
        /// </summary>
        /// <param name="filename">The Config file</param> 
        public Configure(String filename) {
            StreamReader fileReader = new StreamReader(filename);
            String line; 
            while (true) {
                line = fileReader.ReadLine(); 
                if (line == null) break;
                //Ignore comments prefixed with '#'
                if (line.StartsWith("#")) continue;
                if (line.IndexOf('#') > 0) {
                    lines.Add(line.Split('#')[0].Trim());
                } else {
                    lines.Add(line.Trim());
                }
            }
            fileReader.Close();
            fileReader.Dispose();
        }


        /// <summary>
        /// Create a new string dictionary from the named section.
        /// </summary>
        /// <param name="section">The name of the section header</param>
        /// <returns>New Dictionary<String,String> of read key-value pairs from config section.</returns>
        public Dictionary<String,String> ReadSection(String  section) {
            Dictionary<String,String> foundEntries = new Dictionary<String,String>();
            String header = String.Format("[ {0} ]",section);
            int i = 0, j;
            // Read to find the header
            for (i = 0; i < lines.Count; i++) {
                if (lines[i].Equals(header)) {
                    i++; 
                    for (j = i; j < lines.Count && lines[j] != null && !String.IsNullOrWhiteSpace(lines[j]); j++) { 
                        int index = lines[j].IndexOf('='); 
                        String key = lines[j].Substring(0,index), value = lines[j].Substring(index+1);
                        if (foundEntries.ContainsKey(key)) { foundEntries[key] = value; } else { foundEntries.Add(key,value); }
                    }
                    break; // Most configuration utilities don't allow multiple same-named sections
                }
            }
            return foundEntries;
        }
        /// <summary>
        /// If a conf section doesn't use key=value syntax, use this to grab the lines instead.
        /// </summary>
        /// <param name="section">The name of the section header</param>
        /// <returns>New List<String> of read key-value pairs from config section.</returns>
        public List<String> ReadSectionLines(String section) {
            List<String> foundEntries = new List<String>();
            String header = String.Format("[ {0} ]",section);
            int i = 0, j;
            // Read to find the header
            for (i = 0; i < lines.Count; i++) {
                if (lines[i].Equals(header)) {
                    i++; 
                    for (j = i; j < lines.Count && lines[j] != null && !String.IsNullOrWhiteSpace(lines[j]); j++) { 
                        foundEntries.Add(lines[j]);
                    }
                    break; // Most configuration utilities don't allow multiple same-named sections
                }
            }
            return foundEntries;
        }

        /// <summary>
        /// Get the headers in a conf file.
        /// </summary>
        /// <returns>The headers from a file</returns>
        public List<String> GetHeaders() {
            List <String> foundHeaders = new List<String>();
            int i = 0; 
            for (i = 0; i < lines.Count; i++) {
                if (lines[i].Length > 5 && lines[i][0] == '[' && lines[i][lines[i].Length-1] == ']') {
                    foundHeaders.Add(lines[i].Substring(2,lines[i].Length-4));
                }
            }
            return foundHeaders;
        }

        /// <summary>
        /// Get the lines from the file.
        /// </summary>
        /// <returns>The lines from the file</returns>
        public List<String> GetLines() {
            return this.lines;
        }

        /// <summary>
        /// API for printing the configured section
        /// </summary>
        /// <param name="sectionEntries">The dictionary that has been read in</param>
        public static void PrintSectionAsRead(Dictionary<String,String> sectionEntries) {
            foreach (KeyValuePair<string,string> keyValue in sectionEntries) {
                Console.WriteLine(String.Format("Key: {0} -- Value: {1}",keyValue.Key,keyValue.Value));
            }
        } 

    }
}