namespace CommonConsole
{
    using Newtonsoft.Json;

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Runtime.Serialization;

    public class ConfigurationJson : Dictionary<string, Section>
    {
        public Section this[byte id] 
            => this.Values.FirstOrDefault(x => x.Id == id)
            ?? new Section();

        public new Section this[string key]
        {
            get
            {
                if (string.IsNullOrWhiteSpace(key))
                {
                    throw new ArgumentException("Section name should not be null or white space!");
                }

                if (!this.TryGetValue(key, out var section))
                {
                    section = new Section();

                    this[key] = section;
                }

                return section;
            }
            set
            {
                if (string.IsNullOrWhiteSpace(key))
                {
                    throw new ArgumentException("Section name should not be null or white space!");
                }

                this[key] = value;
            }
        }

        [OnDeserialized]
        internal void OnDeserialized(StreamingContext _)
        {
            foreach (var kvp in this)
            {
                kvp.Value.Name = kvp.Key;
            }
        }
    }

    public class Section
    {
        public byte Id { get; set; }

        [JsonIgnore]
        public string Name { get; internal set; }

        public Version Version { get; set; }

        public Registers Registers { get; set; }

        public Status Status { get; set; }

        public Register this[string key]
        {
            get
            {
                if (this.Registers is null)
                {
                    return new Register();
                }

                return this.Registers[key];
            }
            set
            {
                if (this.Registers != null)
                {
                    this.Registers[key] = value;
                }
            }
        }

        public Register this[byte id]
            => this.Registers?[id] ?? new Register();
    }

    public class Version
    {
        public int? First { get; set; }

        public int? Last { get; set; }

        public bool InVersion(int version)
        {
            if (this.First is null && this.Last is null)
            {
                return false;
            }

            return (this.First ?? int.MinValue) <= version && (this.First ?? int.MaxValue) >= version;
        }
    }

    public class Registers : Dictionary<string, Register>
    {
        public Register this[byte id]
            => this.Values.FirstOrDefault(x => x.Id == id) 
            ?? new Register();

        public new Register this[string key]
        {
            get
            {
                if (string.IsNullOrWhiteSpace(key))
                {
                    throw new ArgumentException("Register name should not be null or white space!");
                }

                if (!this.TryGetValue(key, out var register))
                {
                    register = new Register();

                    this[key] = register;
                }

                return register;
            }
            set
            {
                if (string.IsNullOrWhiteSpace(key))
                {
                    throw new ArgumentException("Register name should not be null or white space!");
                }

                this[key] = value;
            }
        }

        [OnDeserialized]
        internal void OnDeserialized(StreamingContext _)
        {
            foreach (var kvp in this)
            {
                kvp.Value.Name = kvp.Key;
            }
        }
    }

    public class Register
    {
        public byte Id { get; set; }

        [JsonIgnore]
        public string Name { get; internal set; }

        public Details Details { get; set; }

        public Detail this[int version]
            => this.Details?[version] ?? new Detail();
    }

    public class Details : List<Detail>
    {
        public new Detail this[int version]
            => this.FirstOrDefault(x => x.Version?.InVersion(version) ?? false)
            ?? new Detail();
    }

    public class Detail
    {
        public string Type { get; set; }

        public string StaticType { get; set; }

        public Privilege Privilege { get; set; }

        public Version Version { get; set; }

        public Values Values { get; set; }

        [JsonIgnore]
        public Value Value { get; set; }

        [JsonIgnore]
        public Unit Unit { get; set; }

        public object this[string property]
        {
            get
            {
                if (property == nameof(Value))
                {
                    return this.Value?.Current;
                }
                else if (property == nameof(Unit))
                {
                    return this.Unit?.Base;
                }

                return null;
            }
            set
            {
                if (property == nameof(Value) && this.Value != null)
                {
                    this.Value.Current = value;
                }
                else if (property == nameof(Unit) && this.Unit != null)
                {
                    this.Unit.Base = value;
                }
            }
        }

        [OnDeserialized]
        internal void OnDeserialized(StreamingContext _)
        {
            try
            {
                var valueType = System.Type.GetType(
                    typeName: $"CommonConsole.{this.Type}",
                    throwOnError: false,
                    ignoreCase: true);
                var instance = Activator.CreateInstance(valueType);

                if (instance is Value value)
                {
                    if (this.Values != null)
                    {
                        value.Current = this.Values.Default;
                    }

                    this.Value = value;
                }
            }
            catch (Exception e)
            {
                // TODO: Handle exceptions.
            }
        }
    }

    public class Values
    {
        public object Default { get; set; }

        public object Minimum { get; set; }

        public object Maximum { get; set; }
    }

    public class Privilege
    {
        public Access Lvl1 { get; set; }

        public Access Lvl2 { get; set; }

        public Access Lvl3 { get; set; }

        public Access Lvl4 { get; set; }

        public Access Lvl5 { get; set; }

        public Access Lvl6 { get; set; }

        public Access Lvl7 { get; set; }

        public Access Lvl8 { get; set; }
    }

    public enum Access : byte
    {
        NS,
        NA,
        RO,
        WO,
        RW
    }

    public class Status : Dictionary<string, StatusInfo>
    {

    }

    public class StatusInfo
    {
        public byte Id { get; set; }

        public string Action { get; set; }

        public string Description { get; set; }
    }

    public class AccessConverter : JsonConverter
    {
        public override bool CanConvert(Type type)
            => type == typeof(Access)
            || type == typeof(Access?);

        public override object ReadJson(JsonReader reader, Type _, object existingValue, JsonSerializer serializer)
        {
            if (reader.TokenType == JsonToken.Null)
            {
                return null;
            }

            var value = serializer.Deserialize<string>(reader);

            if (Enum.TryParse(value, true, out Access access))
            {
                return access;
            }

            return default(Access);
        }

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer _1)
        {
            if (value != null)
            {
                writer.WriteValue($"{value}");
            }
        }
    }
}