using System.Text.Json;
using System.Globalization;
using Application;

namespace Infrastructure
{
    public class CalendarioService : ICalendarioService
    {
        private const string Url = "https://www.ccee.org.br/en/web/guest/calendario?p_p_id=com_liferay_calendar_web_portlet_CalendarPortlet_INSTANCE_urjn&p_p_lifecycle=2&p_p_cacheability=cacheLevelPage&doAsUserId=&p_p_resource_id=calendarBookings";

        public async Task<string?> ObterEventoLimiteColetaAsync(DateTime dataReferencia, CancellationToken ct = default)
        {
            var year = dataReferencia.Year;
            var month = dataReferencia.Month - 1;
            var dayFinal = DateTime.DaysInMonth(year, month + 1);

            var values = new Dictionary<string, string>
            {
                ["_com_liferay_calendar_web_portlet_CalendarPortlet_INSTANCE_urjn_calendarIds"] = "55985",
                ["_com_liferay_calendar_web_portlet_CalendarPortlet_INSTANCE_urjn_endTimeDay"] = dayFinal.ToString(),
                ["_com_liferay_calendar_web_portlet_CalendarPortlet_INSTANCE_urjn_endTimeHour"] = "23",
                ["_com_liferay_calendar_web_portlet_CalendarPortlet_INSTANCE_urjn_endTimeMinute"] = "59",
                ["_com_liferay_calendar_web_portlet_CalendarPortlet_INSTANCE_urjn_endTimeMonth"] = month.ToString(),
                ["_com_liferay_calendar_web_portlet_CalendarPortlet_INSTANCE_urjn_endTimeYear"] = year.ToString(),
                ["_com_liferay_calendar_web_portlet_CalendarPortlet_INSTANCE_urjn_eventsPerPage"] = "-1",
                ["_com_liferay_calendar_web_portlet_CalendarPortlet_INSTANCE_urjn_startTimeDay"] = "1",
                ["_com_liferay_calendar_web_portlet_CalendarPortlet_INSTANCE_urjn_startTimeHour"] = "0",
                ["_com_liferay_calendar_web_portlet_CalendarPortlet_INSTANCE_urjn_startTimeMinute"] = "0",
                ["_com_liferay_calendar_web_portlet_CalendarPortlet_INSTANCE_urjn_startTimeMonth"] = month.ToString(),
                ["_com_liferay_calendar_web_portlet_CalendarPortlet_INSTANCE_urjn_startTimeYear"] = year.ToString(),
            };

            try
            {
                using var client = new HttpClient();
                using var content = new FormUrlEncodedContent(values);
                var resp = await client.PostAsync(Url, content, ct);
                var resposta = await resp.Content.ReadAsStringAsync(ct);

                var alvo = $"Data limite para coleta diária dos dados de medição no SCDE";

                try
                {
                    using var doc = JsonDocument.Parse(resposta);
                    string? found = null;
                    void SearchJson(JsonElement el)
                    {
                        if (found != null) return;
                        switch (el.ValueKind)
                        {
                            case JsonValueKind.String:
                                var s = el.GetString() ?? "";
                                if (s.Contains(alvo, StringComparison.OrdinalIgnoreCase)) found = s;
                                break;
                            case JsonValueKind.Object:
                                foreach (var prop in el.EnumerateObject()) SearchJson(prop.Value);
                                break;
                            case JsonValueKind.Array:
                                foreach (var item in el.EnumerateArray()) SearchJson(item);
                                break;
                        }
                    }
                    SearchJson(doc.RootElement);
                    if (found != null) return found;
                }
                catch { }

                var idx = resposta.IndexOf(alvo, StringComparison.OrdinalIgnoreCase);
                if (idx >= 0)
                {
                    var start = Math.Max(0, idx - 60);
                    var len = Math.Min(400, resposta.Length - start);
                    return resposta.Substring(start, len).Replace("\r", " ").Replace("\n", " ");
                }

                return null;
            }
            catch
            {
                return null;
            }
        }
    }
}