using System.Text.Json;
using System.Text.Json.Serialization;

namespace OSMDatastructure;

[Serializable]
public class Tag
{
    public TagType key { get; }
    public dynamic value { get; }
    
    [JsonConstructor]
    public Tag(TagType key, dynamic value)
    {
        this.key = key;
        if (value is JsonElement)
        {
            switch (key)
            {
                case TagType.highway:
                    this.value = (WayType)value.GetByte();
                    break;
                case TagType.maxspeed:
                    this.value = value.GetByte();
                    break;
                case TagType.forward:
                case TagType.oneway:
                    this.value = value.GetBoolean();
                    break;
                case TagType.id:
                    this.value = value.GetUInt64();
                    break;
                case TagType.name:
                case TagType.tagref:
                    this.value = value.GetString();
                    break;
                default:
                    this.value = value;
                    break;
            }
        }
        else
        {
            this.value = value;
        }
    }
    
    public static HashSet<Tag> ConvertToTags(string key, string value)
    {
        HashSet<Tag> ret = new HashSet<Tag>();
        switch (key)
        {
            case "highway":
                try
                {
                    ret.Add(new Tag(TagType.highway, (WayType)Enum.Parse(typeof(WayType), value, true)));
                }
                catch (ArgumentException)
                {
                    ret.Add(new Tag(TagType.highway, WayType.unclassified));
                }
                break;
            case "maxspeed":
            case "maxspeed:max":
                try
                {
                    byte speed = Convert.ToByte(value);
                    if (speed != 255)
                        ret.Add(new Tag(TagType.maxspeed, speed));
                }
                catch (Exception)
                {
                    ret.Add(new Tag(TagType.maxspeed, byte.MinValue));
                }
                break;
            case "oneway":
                switch (value)
                {
                    case "yes":
                        ret.Add(new Tag(TagType.oneway, true));
                        break;
                    case "-1":
                        ret.Add(new Tag(TagType.forward, false));
                        ret.Add(new Tag(TagType.oneway, true));
                        break;
                    case "no":
                        ret.Add(new Tag(TagType.oneway, false));
                        break;
                }

                break;
            case "name":
                ret.Add(new Tag(TagType.name, value));
                break;
            case "ref":
                ret.Add(new Tag(TagType.tagref, value));
                break;
        }

        return ret;
    }

    public override string ToString()
    {
        return $"TAG {key.ToString()} {value.ToString()}";
    }

    public enum TagType : byte
    {
        highway, oneway, footway, sidewalk, cycleway, busway, forward, maxspeed, name, surface, lanes, access, tracktype, id, tagref
    }

    public static readonly Dictionary<WayType, byte> defaultSpeedCar = new() {
        { WayType.NONE, 0 },
        { WayType.motorway, 130 },
        { WayType.motorroad, 100 },
        { WayType.trunk, 85 },
        { WayType.primary, 65 },
        { WayType.secondary, 60 },
        { WayType.tertiary, 50 },
        { WayType.unclassified, 30 },
        { WayType.residential, 20 },
        { WayType.motorway_link, 60 },
        { WayType.trunk_link, 50 },
        { WayType.primary_link, 50 },
        { WayType.secondary_link, 50 },
        { WayType.tertiary_link, 30 },
        { WayType.living_street, 10 },
        { WayType.service, 0 },
        { WayType.pedestrian, 0 },
        { WayType.track, 0 },
        { WayType.bus_guideway, 0 },
        { WayType.escape, 0 },
        { WayType.raceway, 0 },
        { WayType.road, 20 },
        { WayType.busway, 0 },
        { WayType.footway, 0 },
        { WayType.bridleway, 0 },
        { WayType.steps, 0 },
        { WayType.corridor, 0 },
        { WayType.path, 0 },
        { WayType.cycleway, 0 },
        { WayType.construction, 0 }
    };

    public static readonly Dictionary<WayType, byte> defaultSpeedPedestrian = new() {
        { WayType.NONE, 0 },
        { WayType.motorway, 0 },
        { WayType.trunk, 0 },
        { WayType.primary, 0 },
        { WayType.secondary, 0 },
        { WayType.tertiary, 2 },
        { WayType.unclassified, 1 },
        { WayType.residential, 4 },
        { WayType.motorway_link, 0 },
        { WayType.trunk_link, 0 },
        { WayType.primary_link, 0 },
        { WayType.secondary_link, 0 },
        { WayType.tertiary_link, 0 },
        { WayType.living_street, 5 },
        { WayType.service, 2 },
        { WayType.pedestrian, 5 },
        { WayType.track, 1 },
        { WayType.bus_guideway, 0 },
        { WayType.escape, 1 },
        { WayType.raceway, 0 },
        { WayType.road, 2 },
        { WayType.busway, 0 },
        { WayType.footway, 4 },
        { WayType.bridleway, 1 },
        { WayType.steps, 2 },
        { WayType.corridor, 3 },
        { WayType.path, 4 },
        { WayType.cycleway, 1 },
        { WayType.construction, 0 }
    };
    // ReSharper disable InconsistentNaming
    public enum WayType : byte { NONE, motorway, motorroad, trunk, primary, secondary, tertiary, unclassified, residential, motorway_link, trunk_link, primary_link, secondary_link, tertiary_link, living_street, service, pedestrian, track, bus_guideway, escape, raceway, road, busway, footway, bridleway, steps, corridor, path, cycleway, construction }
    // ReSharper restore InconsistentNaming

    public enum SpeedType { pedestrian, car, any }
}