//
// Copyright 2014 Perforce Software Inc.
//

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Perforce.Helper {
    public class ExtensionHelper {

        private string _mappingFileName = Application.LocalUserAppDataPath + @"\mappings.json";
        private Dictionary<string, string> _mappings;

        public ExtensionHelper() {
            LoadMappings();
        }

        public Dictionary<string, string> Mappings {
            get { return _mappings; }
            set { _mappings = value; }
        }

        public string GetMapping(string extension) {
            string value = null;
            _mappings.TryGetValue(extension, out value);
            return value;
        }

        public void SetMapping(string extension, string value) {
            if (_mappings == null) {
                _mappings = new Dictionary<string, string>(StringComparer.CurrentCultureIgnoreCase);
            }
            _mappings.Add(extension, value);
        }

        public void SaveMappings() {
            // convert mappings to json
            string json = JsonConvert.SerializeObject(_mappings, Formatting.Indented);
            // write to file
            File.WriteAllText(_mappingFileName, json);
        }

        public void LoadMappings() {
            if (_mappingFileName != null && File.Exists(_mappingFileName)) {
                // read json from file
                var json = File.ReadAllText(_mappingFileName);
                // convert to dictionary
                _mappings = JsonConvert.DeserializeObject<Dictionary<string, string>>(json);
            } else {
                _mappings = new Dictionary<string, string>(StringComparer.CurrentCultureIgnoreCase);
                SaveMappings();
            }
        }
    }
}