using FluentValidation;
using SeaHaven.Services.DTOs;
using SeaHaven.Services.Helpers;

namespace SeaHaven.Services.Validation
{
    public interface ICreateVendorValidation : IValidator<CreateVendorDTO>
    {
    }

    public class CreateVendorValidation : AbstractValidator<CreateVendorDTO>, ICreateVendorValidation
    {
        public CreateVendorValidation()
        {
            RuleFor(x => x.Name)
                .NotEmpty().WithMessage("Vendor name is required")
                .MaximumLength(200).WithMessage("Vendor name cannot exceed 200 characters");

            RuleFor(x => x.Email)
                .EmailAddress().WithMessage("Invalid email address")
                .When(x => !string.IsNullOrEmpty(x.Email));

            // SH-199: technician (ContactName/Phone) is optional. The company must still
            // expose at least one contact channel: a company phone or an email.
            RuleFor(x => x)
                .Must(dto => !string.IsNullOrWhiteSpace(dto.CompanyPhone) || !string.IsNullOrWhiteSpace(dto.Email))
                .WithMessage("At least one company phone or email is required")
                .OverridePropertyName(nameof(CreateVendorDTO.CompanyPhone));

            RuleFor(x => x.ContactName)
                .MaximumLength(200).WithMessage("Contact name cannot exceed 200 characters")
                .When(x => !string.IsNullOrEmpty(x.ContactName));

            RuleFor(x => x.PreferredContact)
                .Must(VendorValidationRules.BeValidPreferredContact)
                .WithMessage("PreferredContact must be one of: Phone, Email, Text")
                .When(x => !string.IsNullOrEmpty(x.PreferredContact));

            RuleFor(x => x.TradeSpecialties)
                .MaximumLength(1000).WithMessage("Trade specialties cannot exceed 1000 characters")
                .When(x => !string.IsNullOrEmpty(x.TradeSpecialties));

            RuleFor(x => x.Phone)
                .Must(VendorValidationRules.BeValidNorthAmericanPhone)
                .WithMessage("Phone must be in North American format: (XXX) XXX-XXXX")
                .When(x => !string.IsNullOrEmpty(x.Phone));

            RuleFor(x => x.CompanyPhone)
                .Must(VendorValidationRules.BeValidNorthAmericanPhone)
                .WithMessage("Company phone must be in North American format: (XXX) XXX-XXXX")
                .When(x => !string.IsNullOrEmpty(x.CompanyPhone));

            RuleFor(x => x.Address)
                .MaximumLength(500).WithMessage("Address cannot exceed 500 characters")
                .When(x => !string.IsNullOrEmpty(x.Address));

            RuleFor(x => x.City)
                .MaximumLength(100).WithMessage("City cannot exceed 100 characters")
                .When(x => !string.IsNullOrEmpty(x.City));

            RuleFor(x => x.State)
                .MaximumLength(2).WithMessage("State must be 2 characters")
                .When(x => !string.IsNullOrEmpty(x.State));

            RuleFor(x => x.Zipcode)
                .MaximumLength(10).WithMessage("Zipcode cannot exceed 10 characters")
                .When(x => !string.IsNullOrEmpty(x.Zipcode));

            RuleFor(x => x.GoogleMapsUrl)
                .Must(VendorValidationRules.BeValidHttpsUrl).WithMessage("Google Maps URL must be a valid HTTPS URL")
                .When(x => !string.IsNullOrEmpty(x.GoogleMapsUrl));

            RuleFor(x => x.Notes)
                .MaximumLength(2000).WithMessage("Notes cannot exceed 2000 characters")
                .When(x => !string.IsNullOrEmpty(x.Notes));
        }
    }

    public interface IUpdateVendorValidation : IValidator<UpdateVendorDTO>
    {
    }

    public class UpdateVendorValidation : AbstractValidator<UpdateVendorDTO>, IUpdateVendorValidation
    {
        public UpdateVendorValidation()
        {
            RuleFor(x => x.Name)
                .MaximumLength(200).WithMessage("Vendor name cannot exceed 200 characters")
                .When(x => !string.IsNullOrEmpty(x.Name));

            RuleFor(x => x.Email)
                .EmailAddress().WithMessage("Invalid email address")
                .When(x => !string.IsNullOrEmpty(x.Email));

            RuleFor(x => x.ContactName)
                .NotEmpty().WithMessage("Technician name is required")
                .MaximumLength(200).WithMessage("Contact name cannot exceed 200 characters")
                .When(x => x.ContactName != null);

            RuleFor(x => x.PreferredContact)
                .Must(VendorValidationRules.BeValidPreferredContact)
                .WithMessage("PreferredContact must be one of: Phone, Email, Text")
                .When(x => !string.IsNullOrEmpty(x.PreferredContact));

            RuleFor(x => x.TradeSpecialties)
                .MaximumLength(1000).WithMessage("Trade specialties cannot exceed 1000 characters")
                .When(x => !string.IsNullOrEmpty(x.TradeSpecialties));

            RuleFor(x => x.Phone)
                .Must(VendorValidationRules.BeValidNorthAmericanPhone)
                .WithMessage("Phone must be in North American format: (XXX) XXX-XXXX")
                .When(x => !string.IsNullOrEmpty(x.Phone));

            RuleFor(x => x.CompanyPhone)
                .Must(VendorValidationRules.BeValidNorthAmericanPhone)
                .WithMessage("Company phone must be in North American format: (XXX) XXX-XXXX")
                .When(x => !string.IsNullOrEmpty(x.CompanyPhone));

            RuleFor(x => x.Address)
                .MaximumLength(500).WithMessage("Address cannot exceed 500 characters")
                .When(x => !string.IsNullOrEmpty(x.Address));

            RuleFor(x => x.City)
                .MaximumLength(100).WithMessage("City cannot exceed 100 characters")
                .When(x => !string.IsNullOrEmpty(x.City));

            RuleFor(x => x.State)
                .MaximumLength(2).WithMessage("State must be 2 characters")
                .When(x => !string.IsNullOrEmpty(x.State));

            RuleFor(x => x.Zipcode)
                .MaximumLength(10).WithMessage("Zipcode cannot exceed 10 characters")
                .When(x => !string.IsNullOrEmpty(x.Zipcode));

            RuleFor(x => x.GoogleMapsUrl)
                .Must(VendorValidationRules.BeValidHttpsUrl).WithMessage("Google Maps URL must be a valid HTTPS URL")
                .When(x => !string.IsNullOrEmpty(x.GoogleMapsUrl));

            RuleFor(x => x.Notes)
                .MaximumLength(2000).WithMessage("Notes cannot exceed 2000 characters")
                .When(x => !string.IsNullOrEmpty(x.Notes));
        }

    }

    public interface IWorkOrderVendorUpdateValidation : IValidator<WorkOrderVendorUpdateDTO>
    {
    }

    public class WorkOrderVendorUpdateValidation : AbstractValidator<WorkOrderVendorUpdateDTO>, IWorkOrderVendorUpdateValidation
    {
        public WorkOrderVendorUpdateValidation()
        {
            RuleFor(x => x.WorkOrderId)
                .GreaterThan(0).WithMessage("A valid work order id is required");

            RuleFor(x => x.PreferredContact)
                .Must(VendorValidationRules.BeValidPreferredContact)
                .WithMessage("PreferredContact must be one of: Phone, Email, Text")
                .When(x => !string.IsNullOrEmpty(x.PreferredContact));

            RuleFor(x => x.Phone)
                .Must(VendorValidationRules.BeValidNorthAmericanPhone)
                .WithMessage("Phone must be in North American format: (XXX) XXX-XXXX")
                .When(x => !string.IsNullOrEmpty(x.Phone));

            RuleFor(x => x.Email)
                .EmailAddress().WithMessage("Invalid email address")
                .When(x => !string.IsNullOrEmpty(x.Email));

            RuleFor(x => x.Notes)
                .MaximumLength(2000).WithMessage("Notes cannot exceed 2000 characters")
                .When(x => !string.IsNullOrEmpty(x.Notes));

            RuleFor(x => x.ContactName)
                .MaximumLength(200).WithMessage("Contact name cannot exceed 200 characters")
                .When(x => !string.IsNullOrEmpty(x.ContactName));
        }
    }

    internal static class VendorValidationRules
    {
        private static readonly string[] AllowedPreferredContacts = { "Phone", "Email", "Text" };

        internal static bool BeValidHttpsUrl(string? value) =>
            Uri.TryCreate(value, UriKind.Absolute, out var uri) && uri.Scheme == Uri.UriSchemeHttps;

        internal static bool BeValidPreferredContact(string? value) =>
            AllowedPreferredContacts.Contains(value, StringComparer.OrdinalIgnoreCase);

        internal static bool BeValidNorthAmericanPhone(string? value) =>
            value is not null && VendorPhoneNormalizer.NorthAmericanPhoneRegex.IsMatch(value);
    }
}