using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace CondoUpdate.SetPermissionsForDomusPage
{
    public class SCInfo
    {
        public string Url;
        public string Username;
        public string Pwd;
    }

    public class Parser
    {
        private UpdaterImpl log;

        public Parser(UpdaterImpl log)
        {
            this.log = log;
        }

        public List<SCInfo> Parse(string fileName)
        {
            try
            {
                if (string.IsNullOrEmpty(fileName))
                {
                    this.log.error("Can't parse file: file name is empty");
                    return new List<SCInfo>();
                }
                this.log.info("Start parsing file '{0}'", fileName);

                var lines = new List<string>(File.ReadAllLines(fileName)).Where(s => !string.IsNullOrEmpty(s)).ToList();
                var result = new List<SCInfo>();
                int num = 1;
                foreach (string line in lines)
                {
                    var info = this.parse(line, num++);
                    if (info != null)
                    {
                        result.Add(info);
                    }
                }

                this.log.info("Parsing is finished. Number of parsed site collections: {0} (total number of rows: {1})", result.Count, num);
                return result;
            }
            catch (Exception x)
            {
                this.log.error("Error occured during parsing file '{0}':\n{1}\n{2}",
                    fileName, x.Message, x.StackTrace);
                return new List<SCInfo>();
            }
        }

        private SCInfo parse(string line, int num)
        {
            try
            {
                if (string.IsNullOrEmpty(line))
                {
                    this.log.error("Can't parse line {0} because it is empty", num);
                    return null;
                }

                string[] vals = line.Split(new[]{","}, StringSplitOptions.None);
                if (vals.Length != 3)
                {
                    this.log.error("Can't parse line {0} ({1}): it doesn't contain 3 columns", num, line);
                    return null;
                }

                var info = new SCInfo {Url = vals[0], Username = vals[1], Pwd = vals[2] };
                return info;
            }
            catch (Exception x)
            {
                this.log.error("Error occured during parsing line {0} ('{1}'):\n{2}\n{3}",
                    num, line, x.Message, x.StackTrace);
                return null;
            }
        }
    }
}