using Metrolog_API.Models;
using MongoDB.Driver;

namespace Metrolog_API.Services
{
	public class RoleService
	{
		private readonly IMongoCollection<RoleModel> _roles;

		public RoleService(IConfiguration config)
		{
			var client = new MongoClient(System.Environment.GetEnvironmentVariable("MONGODB_CONNECTION_STRING"));
			var database = client.GetDatabase(System.Environment.GetEnvironmentVariable("MONGODB_DATABASE"));
			_roles = database.GetCollection<RoleModel>("roles");
		}


		/// <summary>
		/// Read all items in collection ordered by "Name" by page (100 items)
		/// </summary>
		/// <param name="page">Page number</param>
		/// <returns>List of roles on specified page</returns>
		public async Task<List<RoleModel>> GetPageAsync(int page = 1) =>
			await _roles.Find<RoleModel>(role => true).SortByDescending(x => x.Name).Skip((page - 1) * 100).Limit(100).ToListAsync();

		/// <summary>
		/// Get Role by Name
		/// </summary>
		/// <param name="Name">Role Name</param>
		/// <returns>Role or null</returns>
		public async Task<RoleModel?> GetByNameAsync(string Name) =>
			await _roles.Find<RoleModel>(role => role.Name == Name).FirstAsync();

		/// <summary>
		/// Get default role names
		/// </summary>
		/// <returns>Role Names</returns>
		public async Task<List<string>> GetDefaultsAsync()
		{
			List<string> names = new List<string>();
			foreach (RoleModel role in await _roles.Find<RoleModel>(role => role.Default == true).ToListAsync())
			{
				names.Add(role.Name);
			}
			return names;
		}







	}
}