using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace Lagerbestand.Models;

/// <summary>
/// Represents a customer who stores tires at the shop.
/// A customer can have multiple vehicles.
/// </summary>
public class Customer
{
    [Key]
    public Guid Id { get; set; } = Guid.NewGuid();

    [MaxLength(100)]
    public string? FirstName { get; set; }

    [Required]
    [MaxLength(100)]
    public string LastName { get; set; } = string.Empty;

    [MaxLength(200)]
    public string? Company { get; set; }

    [MaxLength(20)]
    public string? Phone { get; set; }

    [MaxLength(100)]
    public string? Email { get; set; }

    [MaxLength(500)]
    public string? Notes { get; set; }

    /// <summary>
    /// Customer number for easy identification (e.g., K-0001)
    /// </summary>
    [MaxLength(20)]
    public string CustomerNumber { get; set; } = string.Empty;

    public bool IsActive { get; set; } = true;

    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;

    public DateTime? UpdatedAt { get; set; }

    /// <summary>
    /// Navigation property for customer's vehicles
    /// </summary>
    public ICollection<Vehicle> Vehicles { get; set; } = new List<Vehicle>();

    /// <summary>
    /// Navigation property for customer's stored tire stacks
    /// </summary>
    public ICollection<TireStack> TireStacks { get; set; } = new List<TireStack>();

    /// <summary>
    /// Full name of the customer
    /// </summary>
    [NotMapped]
    public string FullName => $"{FirstName} {LastName}".Trim();

    /// <summary>
    /// Display name including company if available
    /// </summary>
    [NotMapped]
    public string DisplayName => string.IsNullOrEmpty(Company) 
        ? FullName 
        : $"{FullName} ({Company})";

    /// <summary>
    /// Gets the primary vehicle or the first vehicle if no primary is set
    /// </summary>
    [NotMapped]
    public Vehicle? PrimaryVehicle => Vehicles
        .Where(v => v.IsActive)
        .OrderByDescending(v => v.IsPrimary)
        .ThenBy(v => v.CreatedAt)
        .FirstOrDefault();

    /// <summary>
    /// Gets all active vehicles for this customer
    /// </summary>
    [NotMapped]
    public IEnumerable<Vehicle> ActiveVehicles => Vehicles.Where(v => v.IsActive);

    }