using System.Collections.Generic;
using System.IO;
using System.Linq;
using Microsoft.Extensions.Configuration;

namespace Elwig.Helpers {

    public record struct ScaleConfig {
        public string Id;
        public string? Type;
        public string? Model;
        public string? Connection;
        public string? Empty;
        public string? Filling;
        public string? Limit;
        public string? Log;
        public string? _Log;

        public ScaleConfig(string id, string? type, string? model, string? cnx, string? empty, string? filling, string? limit, string? log) {
            Id = id;
            Type = type;
            Model = model;
            Connection = cnx;
            Empty = empty;
            Filling = filling;
            Limit = limit;
            _Log = log;
            Log = log != null ? Path.Combine(App.DataPath, log) : null;
        }
    }

    public class Config {

        private readonly string FileName;
        public bool Debug;
        public string DatabaseFile = App.DataPath + "database.sqlite3";
        public string? DatabaseLog = null;
        public string? Branch = null;
        public IList<ScaleConfig> Scales;
        private readonly List<ScaleConfig> ScaleList = [];
        private static readonly string[] trueValues = ["1", "true", "yes", "on"];

        public Config(string filename) {
            FileName = filename;
            Scales = ScaleList;
            Read();
        }

        public void Read() {
            var config = new ConfigurationBuilder().AddIniFile(FileName).Build();

            DatabaseFile = Path.Combine(App.DataPath, config["database:file"] ?? "database.sqlite3");
            var log = config["database:log"];
            DatabaseLog = log != null ? Path.Combine(App.DataPath, log) : null;
            Branch = config["general:branch"];
            Debug = trueValues.Contains(config["general:debug"]?.ToLower());

            var scales = config.AsEnumerable().Where(i => i.Key.StartsWith("scale.")).GroupBy(i => i.Key.Split(':')[0][6..]).Select(i => i.Key);
            ScaleList.Clear();
            Scales = ScaleList;
            foreach (var s in scales) {
                ScaleList.Add(new(
                    s, config[$"scale.{s}:type"], config[$"scale.{s}:model"], config[$"scale.{s}:connection"],
                    config[$"scale.{s}:empty"], config[$"scale.{s}:filling"], config[$"scale.{s}:limit"], config[$"scale.{s}:log"]
                ));
            }
        }

        public void Write() {
            using var file = new StreamWriter(FileName, false, Utils.UTF8);
            file.Write($"\r\n[general]\r\n");
            if (Branch != null) file.Write($"branch = {Branch}\r\n");
            if (Debug) file.Write("debug = true\r\n");
            file.Write($"\r\n[database]\r\nfile = {DatabaseFile}\r\n");
            if (DatabaseLog != null) file.Write($"log = {DatabaseLog}\r\n");
            foreach (var s in ScaleList) {
                file.Write($"\r\n[scale.{s.Id}]\r\ntype = {s.Type}\r\nmodel = {s.Model}\r\nconnection = {s.Connection}\r\n");
                if (s.Empty != null) file.Write($"empty = {s.Empty}\r\n");
                if (s.Filling != null) file.Write($"filling = {s.Filling}\r\n");
                if (s.Limit != null) file.Write($"limit = {s.Limit}\r\n");
                if (s._Log != null) file.Write($"log = {s._Log}\r\n");
            }
        }
    }
}