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

namespace Lagerbestand.Models;

/// <summary>
/// Status of a tire stack in the storage system
/// </summary>
public enum TireStackStatus
{
    /// <summary>
    /// Tires are currently stored in the warehouse
    /// </summary>
    Stored = 0,

    /// <summary>
    /// Tires have been picked up by the customer
    /// </summary>
    PickedUp = 1,

    /// <summary>
    /// Tires have been disposed/recycled
    /// </summary>
    Disposed = 2,

    /// <summary>
    /// Tires are reserved for pickup
    /// </summary>
    Reserved = 3,

    /// <summary>
    /// Tires are in inventory (shop stock, not customer-owned)
    /// </summary>
    Inventory = 4,

    /// <summary>
    /// Tires are currently mounted on the customer's vehicle (after a seasonal swap).
    /// They can be re-stored later when swapping back.
    /// </summary>
    OnVehicle = 5
}

/// <summary>
/// Represents a stack of exactly 4 tires as a single indivisible unit.
/// A stack is always 4 identical tires - there is no variable count.
/// This is the main entity that tracks customer tire storage and shop inventory.
/// </summary>
public class TireStack
{
    /// <summary>
    /// Number of tires in a stack - always 4
    /// </summary>
    public const int TiresPerStack = 4;

    [Key]
    public Guid Id { get; set; } = Guid.NewGuid();

    /// <summary>
    /// Custom item count for inventory (default: 4 = standard stack).
    /// Only used for inventory items. Customer stacks always use TiresPerStack.
    /// </summary>
    [Range(1, 99)]
    public int ItemCount { get; set; } = TiresPerStack;

    /// <summary>
    /// Unique identifier/ticket number for this tire stack (e.g., "TS-2024-0001")
    /// This serves as the primary human-readable identifier.
    /// </summary>
    [Required]
    [MaxLength(50)]
    public string TicketNumber { get; set; } = string.Empty;

    /// <summary>
    /// Customer who owns these tires (null for shop inventory)
    /// </summary>
    public Guid? CustomerId { get; set; }

    [ForeignKey(nameof(CustomerId))]
    public Customer? Customer { get; set; }

    /// <summary>
    /// Vehicle these tires belong to (null for shop inventory or legacy data)
    /// </summary>
    public Guid? VehicleId { get; set; }

    [ForeignKey(nameof(VehicleId))]
    public Vehicle? Vehicle { get; set; }

    /// <summary>
    /// Current storage location (null if picked up)
    /// </summary>
    public Guid? StorageLocationId { get; set; }

    [ForeignKey(nameof(StorageLocationId))]
    public StorageLocation? StorageLocation { get; set; }

    /// <summary>
    /// Tire category/type (used for inventory categorization)
    /// </summary>
    public Guid? CatalogItemId { get; set; }

    [ForeignKey(nameof(CatalogItemId))]
    public CatalogItem? CatalogItem { get; set; }

    /// <summary>
    /// Tread depth / condition measurements (e.g. imported from QR report)
    /// </summary>
    public ICollection<TireInspection> Inspections { get; set; } = new List<TireInspection>();

    /// <summary>
    /// Current status of the tire stack
    /// </summary>
    public TireStackStatus Status { get; set; } = TireStackStatus.Stored;

    /// <summary>
    /// Tire size (e.g., "225/45R17")
    /// </summary>
    [MaxLength(50)]
    public string? TireSize { get; set; }

    /// <summary>
    /// Tire brand (e.g., "Michelin", "Continental")
    /// </summary>
    [MaxLength(100)]
    public string? TireBrand { get; set; }

    /// <summary>
    /// Tire model (e.g., "Pilot Sport 4", "WinterContact TS 860")
    /// </summary>
    [MaxLength(100)]
    public string? TireModel { get; set; }

    /// <summary>
    /// Season type
    /// </summary>
    public TireSeason Season { get; set; } = TireSeason.Sommer;

    /// <summary>
    /// Tread depth in mm (average of all 4 tires)
    /// </summary>
    [Range(0, 10)]
    public decimal? TreadDepth { get; set; }

    /// <summary>
    /// DOT/manufacturing date code (e.g., "2523" = week 25 of 2023)
    /// </summary>
    [MaxLength(20)]
    public string? DotCode { get; set; }

    /// <summary>
    /// Whether tires are mounted on rims
    /// </summary>
    public bool WithRims { get; set; } = true;

    /// <summary>
    /// Rim size if with rims (e.g., "17 Zoll")
    /// </summary>
    [MaxLength(20)]
    public string? RimSize { get; set; }

    /// <summary>
    /// TPMS sensors present
    /// </summary>
    public bool HasTpms { get; set; }

    /// <summary>
    /// Tire condition rating
    /// </summary>
    public TireCondition Condition { get; set; } = TireCondition.Good;

    /// <summary>
    /// Additional notes about the tire condition or special requirements
    /// </summary>
    [MaxLength(1000)]
    public string? Notes { get; set; }

    /// <summary>
    /// Date when tires were stored
    /// </summary>
    public DateTime StoredAt { get; set; } = DateTime.UtcNow;

    /// <summary>
    /// Date when tires were picked up
    /// </summary>
    public DateTime? PickedUpAt { get; set; }

    /// <summary>
    /// Expected pickup date (next season change)
    /// </summary>
    public DateTime? ExpectedPickupDate { get; set; }

    /// <summary>
    /// User who stored the tires
    /// </summary>
    public Guid? StoredByUserId { get; set; }

    /// <summary>
    /// User who processed the pickup
    /// </summary>
    public Guid? PickedUpByUserId { get; set; }

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

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

    public DateTime? UpdatedAt { get; set; }

    /// <summary>
    /// Whether this is shop inventory (not customer-owned)
    /// </summary>
    [NotMapped]
    public bool IsInventory => CustomerId == null;

    /// <summary>
    /// Display name - customer name or category name for inventory
    /// </summary>
    [NotMapped]
    public string DisplayName => Customer?.FullName ?? CatalogItem?.Name ?? "Lagerbestand";

    /// <summary>
    /// Summary description for display
    /// </summary>
    [NotMapped]
    public string Summary
    {
        get
        {
            var parts = new List<string>();
            if (!string.IsNullOrEmpty(TireBrand)) parts.Add(TireBrand);
            if (!string.IsNullOrEmpty(TireSize)) parts.Add(TireSize);
            parts.Add(Season.ToString());
            if (WithRims) parts.Add("mit Felgen");
            return string.Join(" | ", parts);
        }
    }

    /// <summary>
    /// Status display text in German
    /// </summary>
    [NotMapped]
    public string StatusText => Status switch
    {
        TireStackStatus.Stored => "Eingelagert",
        TireStackStatus.PickedUp => "Abgeholt",
        TireStackStatus.Disposed => "Entsorgt",
        TireStackStatus.Reserved => "Reserviert",
        TireStackStatus.Inventory => "Lagerbestand",
        TireStackStatus.OnVehicle => "Montiert",
        _ => "Unbekannt"
    };

    /// <summary>
    /// Days stored (for billing purposes)
    /// </summary>
    [NotMapped]
    public int DaysStored => (PickedUpAt ?? DateTime.UtcNow).Subtract(StoredAt).Days;

    /// <summary>
    /// Condition display text in German
    /// </summary>
    [NotMapped]
    public string ConditionText => Condition switch
    {
        TireCondition.Excellent => "Sehr gut",
        TireCondition.Good => "Gut",
        TireCondition.Fair => "Ausreichend",
        TireCondition.Poor => "Mangelhaft",
        TireCondition.Critical => "Kritisch",
        _ => "Unbekannt"
    };
}