using Manager.DTOs;
using ManagerService.Data;
using ManagerService.Data.SubSection;
using ManagerService.DTOs;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;

namespace ManagerService.Services
{
    public class AgendaSyncService
    {
        private readonly ILogger<AgendaSyncService> _logger;
        private readonly IServiceScopeFactory _scopeFactory;
        private readonly IHttpClientFactory _httpClientFactory;

        public AgendaSyncService(ILogger<AgendaSyncService> logger, IServiceScopeFactory scopeFactory, IHttpClientFactory httpClientFactory)
        {
            _logger = logger;
            _scopeFactory = scopeFactory;
            _httpClientFactory = httpClientFactory;
        }

        public async Task SyncAllAsync()
        {
            using var scope = _scopeFactory.CreateScope();
            var db = scope.ServiceProvider.GetRequiredService<MyInfoMateDbContext>();

            var sections = db.Sections.OfType<SectionAgenda>()
                .Where(sa => sa.IsOnlineAgenda && sa.AgendaResourceIds != null && sa.AgendaResourceIds.Count > 0)
                .Select(sa => sa.Id)
                .ToList();

            foreach (var id in sections)
            {
                try { await SyncSectionAsync(id); }
                catch (Exception ex) { _logger.LogError(ex, "Error syncing agenda section {Id}", id); }
            }
        }

        public async Task SyncSectionAsync(string sectionAgendaId)
        {
            using var scope = _scopeFactory.CreateScope();
            var db = scope.ServiceProvider.GetRequiredService<MyInfoMateDbContext>();

            var section = db.Sections.OfType<SectionAgenda>()
                .Include(sa => sa.EventAgendas)
                .FirstOrDefault(sa => sa.Id == sectionAgendaId);

            if (section == null || !section.IsOnlineAgenda || section.AgendaResourceIds == null)
                return;

            var http = _httpClientFactory.CreateClient();

            foreach (var resourceRef in section.AgendaResourceIds)
            {
                if (string.IsNullOrEmpty(resourceRef.value) || string.IsNullOrEmpty(resourceRef.language))
                    continue;

                var resource = db.Resources.FirstOrDefault(r => r.Id == resourceRef.value);
                if (resource == null || string.IsNullOrEmpty(resource.Url))
                    continue;

                List<RemoteEventAgendaDTO> remoteEvents;
                try
                {
                    var json = await http.GetStringAsync(resource.Url);
                    remoteEvents = JsonConvert.DeserializeObject<List<RemoteEventAgendaDTO>>(json, RemoteAgendaJsonSettings.Lenient) ?? new();
                }
                catch (Exception ex)
                {
                    _logger.LogWarning(ex, "Failed to fetch agenda JSON for section {Id} language {Lang}", sectionAgendaId, resourceRef.language);
                    continue;
                }

                foreach (var remote in remoteEvents)
                {
                    var dateFrom = remote.GetDateFrom();

                    // Match on DateFrom (date part only), restricted to IsSynced events
                    var existing = section.EventAgendas.FirstOrDefault(ea =>
                        ea.IsSynced &&
                        ea.DateFrom.HasValue &&
                        dateFrom.HasValue &&
                        ea.DateFrom.Value.Date == dateFrom.Value.Date);

                    if (existing == null)
                    {
                        existing = new EventAgenda
                        {
                            Label = new List<TranslationDTO>(),
                            Description = new List<TranslationDTO>(),
                            SectionAgendaId = sectionAgendaId,
                            IsSynced = true,
                        };
                        section.EventAgendas.Add(existing);
                        db.EventAgendas.Add(existing);
                    }

                    // Update / set translation for this language
                    SetTranslation(existing.Label, resourceRef.language, remote.name);
                    SetTranslation(existing.Description, resourceRef.language, remote.description);

                    // Non-translated fields (last language wins, acceptable)
                    existing.DateFrom = dateFrom;
                    existing.DateTo = remote.GetDateTo();
                    existing.Phone = remote.phone;
                    existing.Email = remote.email;
                    existing.Website = remote.website;
                    existing.IdVideoYoutube = remote.id_video_youtube;
                    existing.IsSynced = true;
                }
            }

            db.SaveChanges();
            _logger.LogInformation("Synced agenda section {Id}", sectionAgendaId);
        }

        private static void SetTranslation(List<TranslationDTO> list, string language, string? value)
        {
            var existing = list.FirstOrDefault(t => t.language == language);
            if (existing != null)
                existing.value = value ?? "";
            else
                list.Add(new TranslationDTO { language = language, value = value ?? "" });
        }
    }
}