using Microsoft.Extensions.Configuration;
using System.Windows;

namespace PamhagenSysCtrl.Helpers {
    public class Config {

        private static readonly string[] TrueValues = ["1", "true", "yes", "on"];

        private readonly string FileName;

        public string PlcPort = "COM1";
        public string? UpdateUrl;
        public bool UpdateAuto;

        public PamhagenPlant.ShortcutKey?[] Xbe24KeyMap;

        public Config(string filename) {
            FileName = filename;
            Xbe24KeyMap = new PamhagenPlant.ShortcutKey?[24];
            Read();
        }

        public void Read() {
            try {
                var config = new ConfigurationBuilder().AddIniFile(FileName).Build();
                PlcPort = config["plc:port"] ?? "COM1";
                UpdateUrl = config["update:url"];
                UpdateAuto = TrueValues.Contains(config["update:auto"]?.ToLower());
                var xbe24 = config.GetSection("xbe24");
                for (char c = 'a'; c <= 'd'; c++) {
                    for (int r = 1; r <= 6; r++) {
                        int n = (c - 'a') * 6 + r - 1;
                        var s = xbe24[$"{c}{r}"]?.ToUpper();
                        Xbe24KeyMap[n] = s == null ? null : Enum.Parse<PamhagenPlant.ShortcutKey>(s);
                    }
                }
            } catch (Exception exc) {
                MessageBox.Show($"Die Konfigurationsdatei konnte nicht gelesen werden:\n\n{exc.Message}", "Konfigurationsdatei lesen", MessageBoxButton.OK, MessageBoxImage.Error);
                Application.Current.Shutdown();
            }
        }

        public PamhagenPlant.ShortcutKey? MapKey(int n) {
            return n < 0 || Xbe24KeyMap.Length < n ? null : Xbe24KeyMap[n];
        }

        public int? MapKey(PamhagenPlant.ShortcutKey key) {
            return Xbe24KeyMap.IndexOf(key) is int n ? n == -1 ? null : n : null;
        }
    }
}