<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class AssetAccount extends Model
{
    use HasFactory, SoftDeletes;

    /**
     * Status do ativo
     */
    public const STATUS_ACTIVE = 'active';
    public const STATUS_SOLD = 'sold';
    public const STATUS_DEPRECIATED = 'depreciated';
    public const STATUS_WRITTEN_OFF = 'written_off';

    public const STATUSES = [
        self::STATUS_ACTIVE => 'Activo',
        self::STATUS_SOLD => 'Vendido',
        self::STATUS_DEPRECIATED => 'Depreciado',
        self::STATUS_WRITTEN_OFF => 'Dado de baja',
    ];

    /**
     * Tipos de ativo
     */
    public const ASSET_TYPE_REAL_ESTATE = 'real_estate';
    public const ASSET_TYPE_VEHICLE = 'vehicle';
    public const ASSET_TYPE_INVESTMENT = 'investment';
    public const ASSET_TYPE_EQUIPMENT = 'equipment';
    public const ASSET_TYPE_INVENTORY = 'inventory';
    public const ASSET_TYPE_RECEIVABLE = 'receivable';
    public const ASSET_TYPE_CASH = 'cash';
    public const ASSET_TYPE_OTHER = 'other';

    public const ASSET_TYPES = [
        self::ASSET_TYPE_REAL_ESTATE => [
            'name' => 'Inmueble',
            'description' => 'Casa, apartamento, terreno, local comercial',
            'icon' => 'home',
            'is_depreciable' => true,
            'fields' => ['property_type', 'address', 'property_area_m2', 'registry_number'],
        ],
        self::ASSET_TYPE_VEHICLE => [
            'name' => 'Vehículo',
            'description' => 'Coche, moto, camión, maquinaria móvil',
            'icon' => 'truck',
            'is_depreciable' => true,
            'fields' => ['vehicle_brand', 'vehicle_model', 'vehicle_year', 'vehicle_plate', 'vehicle_mileage'],
        ],
        self::ASSET_TYPE_INVESTMENT => [
            'name' => 'Inversión',
            'description' => 'Acciones, fondos, bonos, criptomonedas',
            'icon' => 'chart-bar',
            'is_depreciable' => false,
            'fields' => ['investment_type', 'institution', 'ticker', 'quantity', 'unit_price'],
        ],
        self::ASSET_TYPE_EQUIPMENT => [
            'name' => 'Equipamiento',
            'description' => 'Maquinaria, herramientas, ordenadores',
            'icon' => 'cog',
            'is_depreciable' => true,
            'fields' => ['equipment_brand', 'equipment_model', 'serial_number', 'warranty_expiry'],
        ],
        self::ASSET_TYPE_INVENTORY => [
            'name' => 'Inventario',
            'description' => 'Stock, mercancías, materias primas',
            'icon' => 'archive-box',
            'is_depreciable' => false,
            'fields' => ['quantity'],
        ],
        self::ASSET_TYPE_RECEIVABLE => [
            'name' => 'Cuenta por Cobrar',
            'description' => 'Créditos, préstamos otorgados',
            'icon' => 'banknotes',
            'is_depreciable' => false,
            'fields' => ['debtor_name', 'receivable_due_date', 'receivable_amount'],
        ],
        self::ASSET_TYPE_CASH => [
            'name' => 'Efectivo/Caja',
            'description' => 'Dinero en efectivo, caja chica',
            'icon' => 'currency-euro',
            'is_depreciable' => false,
            'fields' => [],
        ],
        self::ASSET_TYPE_OTHER => [
            'name' => 'Otro',
            'description' => 'Otros tipos de activos',
            'icon' => 'document-text',
            'is_depreciable' => false,
            'fields' => [],
        ],
    ];

    /**
     * Tipos de imóvel
     */
    public const PROPERTY_TYPES = [
        'house' => 'Casa',
        'apartment' => 'Apartamento/Piso',
        'land' => 'Terreno',
        'commercial' => 'Local Comercial',
        'industrial' => 'Nave Industrial',
        'office' => 'Oficina',
        'parking' => 'Plaza de Garaje',
        'warehouse' => 'Almacén',
        'rural' => 'Finca Rústica',
    ];

    /**
     * Tipos de investimento
     */
    public const INVESTMENT_TYPES = [
        'stocks' => ['name' => 'Acciones', 'description' => 'Participaciones en empresas cotizadas'],
        'bonds' => ['name' => 'Bonos', 'description' => 'Títulos de deuda pública o privada'],
        'funds' => ['name' => 'Fondos de Inversión', 'description' => 'Fondos mutuos, ETFs'],
        'fixed_income' => ['name' => 'Renta Fija', 'description' => 'Depósitos, letras del tesoro'],
        'crypto' => ['name' => 'Criptomonedas', 'description' => 'Bitcoin, Ethereum, etc.'],
        'real_estate_fund' => ['name' => 'Fondo Inmobiliario', 'description' => 'REITs, SOCIMIs'],
        'pension' => ['name' => 'Plan de Pensiones', 'description' => 'Ahorro para jubilación'],
        'savings' => ['name' => 'Cuenta de Ahorro', 'description' => 'Cuentas remuneradas'],
    ];

    /**
     * Métodos de depreciação
     */
    public const DEPRECIATION_METHODS = [
        'linear' => ['name' => 'Lineal', 'description' => 'Depreciación constante cada año'],
        'declining_balance' => ['name' => 'Saldo Decreciente', 'description' => 'Mayor depreciación al inicio'],
        'units_production' => ['name' => 'Unidades Producidas', 'description' => 'Según uso/producción'],
        'sum_years' => ['name' => 'Suma de Años', 'description' => 'Depreciación acelerada'],
    ];

    /**
     * Tipos de indexadores (para investimentos)
     */
    public const INDEX_TYPES = [
        'fixed' => ['name' => 'Tasa Fija', 'description' => 'Rentabilidad fija'],
        'cdi' => ['name' => 'CDI', 'description' => '% del CDI (Brasil)'],
        'selic' => ['name' => 'SELIC', 'description' => 'Tasa SELIC (Brasil)'],
        'ipca' => ['name' => 'IPCA+', 'description' => 'Inflación + spread (Brasil)'],
        'euribor' => ['name' => 'Euribor+', 'description' => 'Euribor + spread (UE)'],
        'ibex' => ['name' => 'IBEX 35', 'description' => 'Índice bursátil español'],
        'sp500' => ['name' => 'S&P 500', 'description' => 'Índice bursátil americano'],
    ];

    protected $fillable = [
        'user_id',
        'business_id',
        'asset_type',
        'name',
        'description',
        'currency',
        'color',
        
        // Valores
        'acquisition_value',
        'current_value',
        'acquisition_date',
        
        // Depreciação
        'is_depreciable',
        'depreciation_method',
        'useful_life_years',
        'residual_value',
        'accumulated_depreciation',
        
        // Imóveis
        'property_type',
        'address',
        'city',
        'state',
        'postal_code',
        'country',
        'property_area_m2',
        'registry_number',
        
        // Veículos
        'vehicle_brand',
        'vehicle_model',
        'vehicle_year',
        'vehicle_plate',
        'vehicle_vin',
        'vehicle_mileage',
        
        // Investimentos
        'investment_type',
        'institution',
        'account_number',
        'quantity',
        'unit_price',
        'ticker',
        'maturity_date',
        'interest_rate',
        'index_type',
        
        // Equipamentos
        'equipment_brand',
        'equipment_model',
        'serial_number',
        'warranty_expiry',
        
        // Recebíveis
        'debtor_name',
        'debtor_document',
        'receivable_due_date',
        'receivable_amount',
        
        // Garantias
        'is_collateral',
        'collateral_for',
        'linked_liability_id',
        
        // Seguros
        'has_insurance',
        'insurance_company',
        'insurance_policy',
        'insurance_value',
        'insurance_expiry',
        
        // Gestão
        'alert_days_before',
        'internal_responsible',
        'internal_notes',
        'document_number',
        
        // Status
        'status',
        'disposal_date',
        'disposal_value',
        'disposal_reason',
    ];

    protected $casts = [
        'acquisition_value' => 'decimal:2',
        'current_value' => 'decimal:2',
        'residual_value' => 'decimal:2',
        'accumulated_depreciation' => 'decimal:2',
        'property_area_m2' => 'decimal:2',
        'useful_life_years' => 'decimal:2',
        'unit_price' => 'decimal:6',
        'insurance_value' => 'decimal:2',
        'receivable_amount' => 'decimal:2',
        'disposal_value' => 'decimal:2',
        'interest_rate' => 'decimal:4',
        'is_depreciable' => 'boolean',
        'is_collateral' => 'boolean',
        'has_insurance' => 'boolean',
        'acquisition_date' => 'date',
        'maturity_date' => 'date',
        'warranty_expiry' => 'date',
        'receivable_due_date' => 'date',
        'insurance_expiry' => 'date',
        'disposal_date' => 'date',
    ];

    /**
     * Relações
     */
    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class);
    }

    public function business(): BelongsTo
    {
        return $this->belongsTo(Business::class);
    }

    public function linkedLiability(): BelongsTo
    {
        return $this->belongsTo(LiabilityAccount::class, 'linked_liability_id');
    }

    /**
     * Scopes
     */
    public function scopeActive($query)
    {
        return $query->where('status', self::STATUS_ACTIVE);
    }

    public function scopeOfType($query, string $type)
    {
        return $query->where('asset_type', $type);
    }

    public function scopeDepreciable($query)
    {
        return $query->where('is_depreciable', true);
    }

    /**
     * Accessors
     */
    public function getAssetTypeNameAttribute(): string
    {
        return self::ASSET_TYPES[$this->asset_type]['name'] ?? $this->asset_type;
    }

    public function getStatusNameAttribute(): string
    {
        return self::STATUSES[$this->status] ?? $this->status;
    }

    public function getNetValueAttribute(): float
    {
        return $this->current_value - $this->accumulated_depreciation;
    }

    public function getGainLossAttribute(): float
    {
        return $this->current_value - $this->acquisition_value;
    }

    public function getGainLossPercentAttribute(): float
    {
        if ($this->acquisition_value == 0) return 0;
        return (($this->current_value - $this->acquisition_value) / $this->acquisition_value) * 100;
    }

    /**
     * Calcular depreciação anual (método linear)
     */
    public function calculateAnnualDepreciation(): float
    {
        if (!$this->is_depreciable || !$this->useful_life_years || $this->useful_life_years == 0) {
            return 0;
        }

        $depreciableValue = $this->acquisition_value - ($this->residual_value ?? 0);
        return $depreciableValue / $this->useful_life_years;
    }

    /**
     * Verificar se seguro está próximo do vencimento
     */
    public function isInsuranceExpiringSoon(int $days = 30): bool
    {
        if (!$this->has_insurance || !$this->insurance_expiry) {
            return false;
        }

        return $this->insurance_expiry->diffInDays(now()) <= $days;
    }
}