// Copyright (C) Stichting Deltares 2024. All rights reserved.
// 
// This file is part of the application DAM - UI.
// 
// DAM - UI is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
// 
// All names, logos, and references to "Deltares" are registered trademarks of
// Stichting Deltares and remain full property of Stichting Deltares at all times.
// All rights reserved.

using System.Collections.Generic;
using System.Text.RegularExpressions;

namespace GeoXY2LatLong
{
    /// <summary>
    /// CommandLineArgumentParser class
    /// </summary>
    public class CommandLineArgumentParser
    {
        // Variables
        private readonly Dictionary<string, string> parameters;

        // Constructor
        public CommandLineArgumentParser(IEnumerable<string> arguments)
        {
            parameters = new Dictionary<string, string>();
            var splitter = new Regex(@"^-{1,2}|^/|=|:", RegexOptions.IgnoreCase | RegexOptions.Compiled);
            var remover = new Regex(@"^['""]?(.*?)['""]?$", RegexOptions.IgnoreCase | RegexOptions.Compiled);
            string parameter = null;
            string[] parts;

            // Valid parameters forms:
            // {-,/,--}param{ ,=,:}((",')value(",'))
            // Examples: -param1 value1 --param2 /param3:"Test-:-work" /param4=happy -param5 '--=nice=--'
            foreach (string argument in arguments)
            {
                // Look for new parameters (-,/ or --) and a possible enclosed value (=,:)
                parts = splitter.Split(argument, 3);
                switch (parts.Length)
                {
                    // Found a value (for the last parameter found (space separator))
                    case 1:
                        if (parameter != null)
                        {
                            if (!parameters.ContainsKey(parameter))
                            {
                                parts[0] = remover.Replace(parts[0], "$1");
                                parameters.Add(parameter, parts[0]);
                            }

                            parameter = null;
                        }

                        // else Error: no parameter waiting for a value (skipped)
                        break;
                    // Found just a parameter
                    case 2:
                        // The last parameter is still waiting. With no value, set it to true.
                        if (parameter != null)
                        {
                            if (!parameters.ContainsKey(parameter))
                            {
                                parameters.Add(parameter, "true");
                            }
                        }

                        parameter = parts[1];
                        break;
                    // Parameter with enclosed value
                    case 3:
                        // The last parameter is still waiting. With no value, set it to true.
                        if (parameter != null)
                        {
                            if (!parameters.ContainsKey(parameter))
                            {
                                parameters.Add(parameter, "true");
                            }
                        }

                        parameter = parts[1];
                        // Remove possible enclosing characters (",')
                        if (!parameters.ContainsKey(parameter))
                        {
                            parts[2] = remover.Replace(parts[2], "$1");
                            parameters.Add(parameter, parts[2]);
                        }

                        parameter = null;
                        break;
                }
            }

            // In case a parameter is still waiting
            if (parameter != null)
            {
                if (!parameters.ContainsKey(parameter))
                {
                    parameters.Add(parameter, "true");
                }
            }
        }

        // Retrieve a parameter value if it exists
        public string this[string param]
        {
            get
            {
                return parameters[param];
            }
        }

        public int Count
        {
            get
            {
                return parameters.Count;
            }
        }

        public bool Contains(string key)
        {
            return parameters.ContainsKey(key);
        }
    }
}