using System;
using System.Collections.Generic;
using System.Linq;
using FluentValidation;
using NzbDrone.Core.Annotations;
using NzbDrone.Core.ThingiProvider;
using NzbDrone.Core.Validation;

namespace NzbDrone.Core.Notifications.Email
{
    public class EmailSettingsValidator : AbstractValidator<EmailSettings>
    {
        public EmailSettingsValidator()
        {
            RuleFor(c => c.Server).NotEmpty();
            RuleFor(c => c.Port).InclusiveBetween(1, 65535);
            RuleFor(c => c.From).NotEmpty();
            RuleForEach(c => c.To).EmailAddress();
            RuleForEach(c => c.Cc).EmailAddress();
            RuleForEach(c => c.Bcc).EmailAddress();

            // Only require one of three send fields to be set
            RuleFor(c => c.To).NotEmpty().Unless(c => c.Bcc.Any() || c.Cc.Any());
            RuleFor(c => c.Cc).NotEmpty().Unless(c => c.To.Any() || c.Bcc.Any());
            RuleFor(c => c.Bcc).NotEmpty().Unless(c => c.To.Any() || c.Cc.Any());
        }
    }

    public class EmailSettings : IProviderConfig
    {
        private static readonly EmailSettingsValidator Validator = new EmailSettingsValidator();

        public EmailSettings()
        {
            Port = 587;
            To = Array.Empty<string>();
            Cc = Array.Empty<string>();
            Bcc = Array.Empty<string>();
        }

        [FieldDefinition(0, Label = "Server", HelpText = "Hostname or IP of Email server", Placeholder = "smtp.gmail.com")]
        public string Server { get; set; }

        [FieldDefinition(1, Label = "Port")]
        public int Port { get; set; }

        [FieldDefinition(2, Label = "NotificationsEmailSettingsUseEncryption", HelpText = "NotificationsEmailSettingsUseEncryptionHelpText", Type = FieldType.Select, SelectOptions = typeof(EmailEncryptionType))]
        public int UseEncryption { get; set; }

        [FieldDefinition(3, Label = "Username", HelpText = "Username", Type = FieldType.Textbox, Privacy = PrivacyLevel.UserName)]
        public string Username { get; set; }

        [FieldDefinition(4, Label = "Password", HelpText = "Password", Type = FieldType.Password, Privacy = PrivacyLevel.Password)]
        public string Password { get; set; }

        [FieldDefinition(5, Label = "From Address", Placeholder = "example@email.com")]
        public string From { get; set; }

        [FieldDefinition(6, Label = "Recipient Address(es)", HelpText = "Comma separated list of email recipients", Placeholder = "example@email.com,example1@email.com")]
        public IEnumerable<string> To { get; set; }

        [FieldDefinition(7, Label = "CC Address(es)", HelpText = "Comma separated list of email cc recipients", Placeholder = "example@email.com,example1@email.com", Advanced = true)]
        public IEnumerable<string> Cc { get; set; }

        [FieldDefinition(8, Label = "BCC Address(es)", HelpText = "Comma separated list of email bcc recipients", Placeholder = "example@email.com,example1@email.com", Advanced = true)]
        public IEnumerable<string> Bcc { get; set; }

        public NzbDroneValidationResult Validate()
        {
            return new NzbDroneValidationResult(Validator.Validate(this));
        }
    }

    public enum EmailEncryptionType
    {
        Preferred = 0,
        Always = 1,
        Never = 2
    }
}
