using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using UniVerse.Application.DTOs.Sync;
using UniVerse.Application.Interfaces;
using UniVerse.Domain.Entities;
using UniVerse.Infrastructure.Data;

namespace UniVerse.Infrastructure.Services;

public class ScheduleSyncService : IScheduleSyncService
{
    private readonly AppDbContext _db;
    private readonly IModeusApiClient _modeus;
    private readonly ILogger<ScheduleSyncService> _logger;
    private static SyncStatusDto _lastStatus = new(null, "idle", null);

    public ScheduleSyncService(AppDbContext db, IModeusApiClient modeus, ILogger<ScheduleSyncService> logger)
    {
        _db = db; _modeus = modeus; _logger = logger;
    }

    public async Task<SyncResultDto> SyncScheduleAsync(SyncScheduleRequest request)
    {
        int created = 0, updated = 0, skipped = 0;
        try
        {
            var events = await _modeus.SearchEventsAsync(request);
            foreach (var ev in events.Events)
            {
                var existing = await _db.Lectures.FirstOrDefaultAsync(l => l.ExternalId == ev.Id);
                if (existing != null) { updated++; existing.StartsAt = ev.StartsAt; existing.EndsAt = ev.EndsAt; existing.UpdatedAt = DateTime.UtcNow; }
                else
                {
                    var course = await _db.Courses.FirstOrDefaultAsync(c => c.ExternalId == ev.TypeId);
                    if (course == null) { course = new Course { Name = ev.Name, ExternalId = ev.TypeId, IsSynced = true }; _db.Courses.Add(course); await _db.SaveChangesAsync(); }
                    _db.Lectures.Add(new Lecture { CourseId = course.Id, Title = ev.Name, ExternalId = ev.Id, StartsAt = ev.StartsAt, EndsAt = ev.EndsAt });
                    created++;
                }
            }
            await _db.SaveChangesAsync();
            var result = new SyncResultDto(created, updated, skipped, null);
            _lastStatus = new SyncStatusDto(DateTime.UtcNow, "completed", result);
            return result;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Schedule sync failed");
            var result = new SyncResultDto(created, updated, skipped, ex.Message);
            _lastStatus = new SyncStatusDto(DateTime.UtcNow, "failed", result);
            return result;
        }
    }

    public async Task<SyncResultDto> SyncRoomsAsync()
    {
        int created = 0, updated = 0, skipped = 0;
        try
        {
            var rooms = await _modeus.SearchRoomsAsync();
            foreach (var room in rooms?.RoomItems ?? [])
            {
                if (room is null || string.IsNullOrWhiteSpace(room.Id) || string.IsNullOrWhiteSpace(room.Name))
                {
                    skipped++;
                    continue;
                }

                var existing = await _db.Locations.FirstOrDefaultAsync(l => l.ExternalId == room.Id);
                if (existing != null)
                {
                    existing.Name = room.Name;
                    existing.Room = room.NameShort;
                    existing.Building = room.Building?.Name ?? room.Building?.NameShort;
                    existing.Address = room.Building?.Address;
                    updated++;
                }
                else
                {
                    _db.Locations.Add(new Location
                    {
                        Name = room.Name,
                        Room = room.NameShort,
                        Building = room.Building?.Name ?? room.Building?.NameShort,
                        Address = room.Building?.Address,
                        ExternalId = room.Id
                    });
                    created++;
                }
            }

            await _db.SaveChangesAsync();
            var result = new SyncResultDto(created, updated, skipped, null);
            _lastStatus = new SyncStatusDto(DateTime.UtcNow, "completed", result);
            return result;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Rooms sync failed");
            var result = new SyncResultDto(created, updated, skipped, ex.Message);
            _lastStatus = new SyncStatusDto(DateTime.UtcNow, "failed", result);
            return result;
        }
    }

    public async Task<List<EmployeeDto>> SearchEmployeesAsync(string fullname)
    {
        var employees = await _modeus.SearchEmployeeAsync(fullname);
        return employees.Select(e => new EmployeeDto(e.Id, e.FullName, e.Department)).ToList();
    }

    public Task<SyncStatusDto> GetLastSyncStatusAsync() => Task.FromResult(_lastStatus);
}