using PostFundManagement.Application.Abstractions.Services;
using PostFundManagement.Domain;
using PostFundManagement.Domain.Abstractions;
using PostFundManagement.Domain.Errors;
using PostFundManagement.Domain.Extensions;
using PostFundManagement.Domain.Models;
using PostFundManagement.Infrastructure.Database;

namespace PostFundManagement.Application.Services.Users;

public sealed class UserService(IDbContextFactory<ApplicationDbContext> contextFactory, ITenantContextService tenantContext) : IUserService
{
    public async Task<Result> SyncUserAsync(Guid userId, string email, string role, CancellationToken cancellationToken = default) =>
        await Result.Try((Func<Task<Result>>)(async () =>
        {
            await using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            if (string.IsNullOrWhiteSpace(role))
                return Result.Fail(ValidationError.Create("Failed to sync, user role not present, contact support"));

            var tenantUser = await context.TenantUsers
                .Include(i => i.User)
                .FirstOrDefaultAsync(u => u.UserId == userId, cancellationToken);

            if (tenantUser is null)
            {
                context.Users.Add(new Domain.Entities.User
                {
                    Id = userId,
                    Email = email,
                    Status = ActivityStatus.Active,
                    LastLoginAt = DateTime.UtcNow,
                    Role = role
                });

                context.TenantUsers.Add(new Domain.Entities.TenantUser
                {
                    CreatedAt = DateTime.UtcNow,
                    CreatedBy = userId,
                    Status = ActivityStatus.Active,
                    TenantId = tenantContext.TenantId,
                    UserId = userId
                });
            }
            else
            {
                tenantUser.User!.Email = email;
                tenantUser.User.LastLoginAt = DateTime.UtcNow;
                tenantUser.User.Role = role;

                context.Users.Update(tenantUser.User);
            }

            return Result.OkIf(await context.SaveChangesAsync(cancellationToken) > 0, CreateError.Create("Failed to sync user, contact support"));
        }));

    public async Task<Result<User[]>> GetUsersAsync(Pagination pagination, UserFilterRequest request, CancellationToken cancellationToken = default) =>
        await Result.Try((Func<Task<Result<User[]>>>)(async () =>
        {
            await using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var query = context.TenantUsers.Include(i => i.User).AsNoTracking();

            if (request.Status.HasValue)
                query = query.Where(u => u.Status == request.Status.Value);

            if (!string.IsNullOrWhiteSpace(request.Email))
                query = query.Where(u => u.User!.Email != null && u.User!.Email.Contains(request.Email));

            if (!string.IsNullOrWhiteSpace(request.SortBy))
                query = request.SortBy.ToLowerInvariant() switch
                {
                    "email" => request.SortDescending ? query.OrderByDescending(u => u.User!.Email) : query.OrderBy(u => u.User!.Email),
                    "lastloginat" => request.SortDescending ? query.OrderByDescending(u => u.User!.LastLoginAt) : query.OrderBy(u => u.User!.LastLoginAt),
                    "status" => request.SortDescending ? query.OrderByDescending(u => u.Status) : query.OrderBy(u => u.Status),
                    _ => request.SortDescending ? query.OrderByDescending(u => u.Id) : query.OrderBy(u => u.Id)
                };
            else
                query = query.OrderBy(u => u.Id);

            var users = await query.Skip((pagination.Page - 1) * pagination.PageSize)
                .Take(pagination.PageSize).ToListAsync(cancellationToken);

            return Result.Ok(users.Select(u => u.User!.Map()).ToArray());
        }));

    public async Task<Result> UpdateUserStatusAsync(Guid userId, ActivityStatus status, CancellationToken cancellationToken = default) =>
        await Result.Try((Func<Task<Result>>)(async () =>
        {
            await using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var changedTotal = await context.TenantUsers
                .Include(i => i.User)
                .Where(f => f.UserId == userId)
                .ExecuteUpdateAsync(f => f
                    .SetProperty(u => u.Status, status), cancellationToken);

            changedTotal += await context.Users.Where(f => f.Id == userId)
                .ExecuteUpdateAsync(f => f.SetProperty(u => u.Status, status), cancellationToken);

            return Result.OkIf(changedTotal > 0, UpdateError.Create("Failed to update user status."));
        }));

    public async Task<Result<User>> GetUserAsync(Guid userId, CancellationToken cancellationToken) =>
        await Result.Try((Func<Task<Result<User>>>)(async () =>
        {
            await using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var tenantUser = await context.TenantUsers.AsNoTracking()
                .Include(i => i.User)
                .FirstOrDefaultAsync(f => f.UserId == userId, cancellationToken);

            return Result.FailIf(tenantUser == null, NotFoundError.Create("User not found."))
                .ToResult(tenantUser!.User?.Map()!);
        }));
}