using System.Collections.Generic;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using Luticate2.Utils.Dbo.Result;
using Microsoft.AspNetCore.Mvc.ModelBinding;

namespace Luticate2.Utils.Dbo.Filter
{
    public class LuFilterBinder : IModelBinder
    {
        private const string RegExp = "^([\\w\\-]+) *: *([^ \"\']+|\"[^\"]+\"|\'[^\']+\') *";

        public static LuResult<LuFilterDbo> FromString(string data)
        {
            if (data == null)
            {
                data = "";
            }
            var filters = new Dictionary<string, string>();

            Match match;
            do
            {
                match = Regex.Match(data, RegExp);
                if (match.Success)
                {
                    var value = match.Groups[2].Value;
                    if ((value.StartsWith("\"") && value.EndsWith("\"")) ||
                        (value.StartsWith("\'") && value.EndsWith("\'")))
                    {
                        value = value.Remove(value.Length - 1, 1).Remove(0, 1);
                    }
                    filters.Add(match.Groups[1].Value, value);
                    data = data.Remove(match.Index, match.Length);
                }
            } while (match.Success);


            var dbo = new LuFilterDbo
            {
                Query = data.Trim(),
                Filters = filters
            };
            return LuResult<LuFilterDbo>.Ok(dbo);
        }

        public Task BindModelAsync(ModelBindingContext bindingContext)
        {
            var messageTypeResult = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
            var res = FromString(messageTypeResult.FirstValue);
            if (res)
            {
                bindingContext.Result = ModelBindingResult.Success(res.Data);
            }
            else
            {
                bindingContext.Result = ModelBindingResult.Failed();
            }
            return Task.FromResult(0);
        }
    }

    public class LuFilterBinderProvider : IModelBinderProvider
    {
        public IModelBinder GetBinder(ModelBinderProviderContext context)
        {
            if (context.Metadata.ModelType == typeof(LuFilterDbo))
            {
                return new LuFilterBinder();
            }
            return null;
        }
    }
}