using System;
using System.Collections.Generic;
using Newtonsoft.Json;

namespace ManagerService.DTOs
{
    /// <summary>
    /// Lenient settings for deserializing online agenda JSON from PHP APIs.
    /// Any field with an unexpected type (e.g. false instead of string/object) is silently set to null.
    /// </summary>
    public static class RemoteAgendaJsonSettings
    {
        public static readonly JsonSerializerSettings Lenient = new JsonSerializerSettings
        {
            Error = (_, args) => { args.ErrorContext.Handled = true; }
        };
    }

    /// <summary>
    /// Converts boolean false (PHP "no value" pattern) or null to null for object-typed fields.
    /// </summary>
    public class FalseToNullConverter : JsonConverter
    {
        public override bool CanConvert(Type objectType) => true;
        public override bool CanWrite => false;

        public override object? ReadJson(JsonReader reader, Type objectType, object? existingValue, JsonSerializer serializer)
        {
            if (reader.TokenType == JsonToken.Boolean || reader.TokenType == JsonToken.Null)
            {
                reader.Skip();
                return null;
            }
            var jObject = Newtonsoft.Json.Linq.JObject.Load(reader);
            var target = Activator.CreateInstance(objectType)!;
            serializer.Populate(jObject.CreateReader(), target);
            return target;
        }

        public override void WriteJson(JsonWriter writer, object? value, JsonSerializer serializer)
            => throw new NotImplementedException();
    }


    /// <summary>
    /// Specialized DTO for parsing the simplified, localized JSON used by online agendas.
    /// Matches the structure used in the tablet-app (snake_case).
    /// </summary>
    public class RemoteEventAgendaDTO
    {
        public string? name { get; set; }
        public string? description { get; set; }
        public string? type { get; set; }
        public string? date_added { get; set; }
        public string? date_from { get; set; }
        public string? date_to { get; set; }
        public string? date_hour { get; set; }
        public string? website { get; set; }
        public string? phone { get; set; }
        public string? email { get; set; }
        public string? id_video_youtube { get; set; }
        public string? image { get; set; }
        [JsonConverter(typeof(FalseToNullConverter))]
        public RemoteEventAddressDTO? address { get; set; }

        public DateTime? GetDateFrom() => ParseDate(date_from);
        public DateTime? GetDateTo() => ParseDate(date_to);

        private DateTime? ParseDate(string? dateStr)
        {
            if (string.IsNullOrEmpty(dateStr)) return null;
            // Handle YYYYMMDD format (e.g. "20260327")
            if (dateStr.Length == 8 && long.TryParse(dateStr, out _))
                if (DateTime.TryParseExact(dateStr, "yyyyMMdd", null, System.Globalization.DateTimeStyles.None, out var dt8))
                    return dt8;
            if (DateTime.TryParse(dateStr, out var dt)) return dt;
            return null;
        }
    }

    public class RemoteEventAddressDTO
    {
        public string? address { get; set; }
        public object? lat { get; set; }
        public object? lng { get; set; }
        public int? zoom { get; set; }
        public string? place_id { get; set; }
        public string? name { get; set; }
        public string? street_number { get; set; }
        public string? street_name { get; set; }
        public string? city { get; set; }
        public string? state { get; set; }
        public string? post_code { get; set; }
        public string? country { get; set; }
    }
}