<?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;
use Illuminate\Database\Eloquent\Relations\HasMany;

class LiabilityAccount extends Model
{
    use HasFactory, SoftDeletes;

    /**
     * Status do contrato
     */
    public const STATUS_ACTIVE = 'active';
    public const STATUS_PAID_OFF = 'paid_off';
    public const STATUS_DEFAULTED = 'defaulted';
    public const STATUS_RENEGOTIATED = 'renegotiated';

    public const STATUSES = [
        self::STATUS_ACTIVE => 'Activo',
        self::STATUS_PAID_OFF => 'Liquidado',
        self::STATUS_DEFAULTED => 'En mora',
        self::STATUS_RENEGOTIATED => 'Renegociado',
    ];

    /**
     * Tipos de contrato
     */
    public const CONTRACT_TYPE_PERSONAL_LOAN = 'personal_loan';
    public const CONTRACT_TYPE_VEHICLE = 'vehicle_financing';
    public const CONTRACT_TYPE_MORTGAGE = 'mortgage';
    public const CONTRACT_TYPE_CREDIT_CARD = 'credit_card';
    public const CONTRACT_TYPE_CONSORTIUM = 'consortium';
    public const CONTRACT_TYPE_LEASING = 'leasing';
    public const CONTRACT_TYPE_OVERDRAFT = 'overdraft';
    public const CONTRACT_TYPE_PAYROLL_LOAN = 'payroll_loan';
    public const CONTRACT_TYPE_OTHER = 'other';

    public const CONTRACT_TYPES = [
        self::CONTRACT_TYPE_PERSONAL_LOAN => [
            'name' => 'Préstamo Personal',
            'description' => 'Préstamo con cuotas fijas (Sistema PRICE)',
            'icon' => 'banknotes',
            'default_amortization' => 'price',
            'fields' => ['principal_amount', 'annual_interest_rate', 'total_installments', 'start_date', 'first_due_date'],
        ],
        self::CONTRACT_TYPE_VEHICLE => [
            'name' => 'Financiación de Vehículo',
            'description' => 'Crédito para compra de coche o moto',
            'icon' => 'truck',
            'default_amortization' => 'price',
            'fields' => ['principal_amount', 'annual_interest_rate', 'total_installments', 'start_date', 'first_due_date', 'asset_value'],
        ],
        self::CONTRACT_TYPE_MORTGAGE => [
            'name' => 'Hipoteca / Financiación Inmobiliaria',
            'description' => 'Crédito para compra de inmueble',
            'icon' => 'home',
            'default_amortization' => 'sac',
            'fields' => ['principal_amount', 'annual_interest_rate', 'total_installments', 'start_date', 'first_due_date', 'asset_value', 'insurance_amount'],
        ],
        self::CONTRACT_TYPE_CREDIT_CARD => [
            'name' => 'Tarjeta de Crédito',
            'description' => 'Financiación de compras a plazos',
            'icon' => 'credit-card',
            'default_amortization' => 'price',
            'fields' => ['principal_amount', 'annual_interest_rate', 'total_installments', 'first_due_date'],
        ],
        self::CONTRACT_TYPE_CONSORTIUM => [
            'name' => 'Consorcio',
            'description' => 'Grupo de compras con cuotas variables',
            'icon' => 'users',
            'default_amortization' => 'consortium',
            'fields' => ['principal_amount', 'total_installments', 'admin_fee_percent', 'start_date', 'first_due_date'],
        ],
        self::CONTRACT_TYPE_LEASING => [
            'name' => 'Leasing',
            'description' => 'Arrendamiento con opción de compra',
            'icon' => 'key',
            'default_amortization' => 'price',
            'fields' => ['principal_amount', 'annual_interest_rate', 'total_installments', 'start_date', 'first_due_date', 'residual_value'],
        ],
        self::CONTRACT_TYPE_OVERDRAFT => [
            'name' => 'Descubierto / Cheque Especial',
            'description' => 'Línea de crédito rotativa',
            'icon' => 'arrow-trending-down',
            'default_amortization' => 'american',
            'fields' => ['principal_amount', 'monthly_interest_rate'],
        ],
        self::CONTRACT_TYPE_PAYROLL_LOAN => [
            'name' => 'Préstamo con Nómina',
            'description' => 'Crédito con descuento en nómina',
            'icon' => 'briefcase',
            'default_amortization' => 'price',
            'fields' => ['principal_amount', 'annual_interest_rate', 'total_installments', 'start_date', 'first_due_date'],
        ],
        self::CONTRACT_TYPE_OTHER => [
            'name' => 'Otro',
            'description' => 'Otro tipo de pasivo',
            'icon' => 'document-text',
            'default_amortization' => 'price',
            'fields' => ['principal_amount', 'total_installments', 'first_due_date'],
        ],
    ];

    /**
     * Sistemas de amortização
     */
    public const AMORTIZATION_PRICE = 'price';
    public const AMORTIZATION_SAC = 'sac';
    public const AMORTIZATION_AMERICAN = 'american';
    public const AMORTIZATION_CONSORTIUM = 'consortium';

    public const AMORTIZATION_SYSTEMS = [
        self::AMORTIZATION_PRICE => [
            'name' => 'PRICE (Cuota Fija)',
            'description' => 'Cuotas iguales. Intereses decrecientes, amortización creciente.',
        ],
        self::AMORTIZATION_SAC => [
            'name' => 'SAC (Amortización Constante)',
            'description' => 'Amortización fija. Cuotas e intereses decrecientes.',
        ],
        self::AMORTIZATION_AMERICAN => [
            'name' => 'Americano',
            'description' => 'Solo intereses durante el plazo, principal al final.',
        ],
        self::AMORTIZATION_CONSORTIUM => [
            'name' => 'Consorcio',
            'description' => 'Cuotas variables según el grupo.',
        ],
    ];

    /**
     * Tipos de indexadores
     */
    public const INDEX_TYPES = [
        'fixed' => ['name' => 'Tasa Fija', 'description' => 'Sin indexación'],
        'cdi' => ['name' => 'CDI', 'description' => 'Certificado de Depósito Interbancario (Brasil)'],
        'selic' => ['name' => 'SELIC', 'description' => 'Tasa básica de interés (Brasil)'],
        'ipca' => ['name' => 'IPCA', 'description' => 'Índice de precios al consumidor (Brasil)'],
        'igpm' => ['name' => 'IGP-M', 'description' => 'Índice general de precios (Brasil)'],
        'tr' => ['name' => 'TR', 'description' => 'Tasa referencial (Brasil)'],
        'euribor' => ['name' => 'Euribor', 'description' => 'Euro Interbank Offered Rate (UE)'],
        'libor' => ['name' => 'LIBOR', 'description' => 'London Interbank Offered Rate'],
        'sofr' => ['name' => 'SOFR', 'description' => 'Secured Overnight Financing Rate (EUA)'],
        'prime' => ['name' => 'Prime Rate', 'description' => 'Tasa preferencial (EUA)'],
        'ipc' => ['name' => 'IPC', 'description' => 'Índice de precios al consumidor (España)'],
        'other' => ['name' => 'Otro', 'description' => 'Otro indexador'],
    ];

    /**
     * Tipos de garantia
     */
    public const GUARANTEE_TYPES = [
        'none' => ['name' => 'Sin garantía', 'description' => 'Préstamo sin garantía'],
        'fiduciary_alienation' => ['name' => 'Alienación Fiduciaria', 'description' => 'El bien queda en garantía hasta el pago total'],
        'mortgage' => ['name' => 'Hipoteca', 'description' => 'Garantía sobre inmueble'],
        'pledge' => ['name' => 'Prenda', 'description' => 'Garantía sobre bien mueble'],
        'guarantor' => ['name' => 'Fiador/Avalista', 'description' => 'Persona que garantiza la deuda'],
        'payroll' => ['name' => 'Descuento en Nómina', 'description' => 'Descuento directo del salario'],
        'investment' => ['name' => 'Inversión', 'description' => 'Garantía con inversiones/aplicaciones'],
        'letter_of_credit' => ['name' => 'Carta de Crédito', 'description' => 'Garantía bancaria'],
        'surety_bond' => ['name' => 'Seguro Fianza', 'description' => 'Seguro que garantiza la obligación'],
        'other' => ['name' => 'Otra', 'description' => 'Otro tipo de garantía'],
    ];

    protected $fillable = [
        'user_id',
        'account_id',
        'name',
        'contract_type',
        'amortization_system',
        'contract_number',
        'creditor',
        'description',
        'principal_amount',
        'total_interest',
        'total_fees',
        'total_contract_value',
        'total_paid',
        'total_pending',
        'principal_paid',
        'interest_paid',
        'fees_paid',
        'monthly_interest_rate',
        'annual_interest_rate',
        'total_interest_rate',
        'total_installments',
        'paid_installments',
        'pending_installments',
        'start_date',
        'end_date',
        'first_due_date',
        'has_grace_period',
        'grace_period_months',
        'currency',
        'color',
        'icon',
        'status',
        'is_active',
        // Campos avançados - Indexadores
        'index_type',
        'index_spread',
        'total_effective_cost',
        // Campos avançados - Garantias
        'guarantee_type',
        'guarantee_value',
        'guarantee_description',
        'guarantor_name',
        // Campos avançados - Penalidades
        'late_fee_percent',
        'daily_penalty_percent',
        'grace_days_for_penalty',
        // Campos avançados - Específicos por tipo
        'asset_value',
        'asset_description',
        'residual_value',
        'admin_fee_percent',
        'reserve_fund_percent',
        // Campos avançados - Covenants e gestão
        'covenants',
        'alert_days_before',
        'internal_responsible',
        'internal_notes',
        'document_number',
        'registry_office',
    ];

    protected $casts = [
        'principal_amount' => 'decimal:2',
        'total_interest' => 'decimal:2',
        'total_fees' => 'decimal:2',
        'total_contract_value' => 'decimal:2',
        'total_paid' => 'decimal:2',
        'total_pending' => 'decimal:2',
        'principal_paid' => 'decimal:2',
        'interest_paid' => 'decimal:2',
        'fees_paid' => 'decimal:2',
        'monthly_interest_rate' => 'decimal:4',
        'annual_interest_rate' => 'decimal:4',
        'total_interest_rate' => 'decimal:4',
        'start_date' => 'date',
        'end_date' => 'date',
        'first_due_date' => 'date',
        'is_active' => 'boolean',
        'has_grace_period' => 'boolean',
        'grace_period_months' => 'integer',
        // Campos avançados
        'index_spread' => 'decimal:4',
        'total_effective_cost' => 'decimal:4',
        'guarantee_value' => 'decimal:2',
        'late_fee_percent' => 'decimal:2',
        'daily_penalty_percent' => 'decimal:4',
        'grace_days_for_penalty' => 'integer',
        'asset_value' => 'decimal:2',
        'residual_value' => 'decimal:2',
        'admin_fee_percent' => 'decimal:2',
        'reserve_fund_percent' => 'decimal:2',
        'covenants' => 'array',
        'alert_days_before' => 'integer',
    ];

    protected $appends = ['progress_percentage', 'remaining_balance'];

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

    /**
     * Relação com a conta geral (opcional)
     */
    public function account(): BelongsTo
    {
        return $this->belongsTo(Account::class);
    }

    /**
     * Parcelas do contrato
     */
    public function installments(): HasMany
    {
        return $this->hasMany(LiabilityInstallment::class)->orderBy('installment_number');
    }

    /**
     * Parcelas pagas
     */
    public function paidInstallments(): HasMany
    {
        return $this->hasMany(LiabilityInstallment::class)->where('status', 'paid');
    }

    /**
     * Parcelas pendentes
     */
    public function pendingInstallments(): HasMany
    {
        return $this->hasMany(LiabilityInstallment::class)->where('status', 'pending');
    }

    /**
     * Próxima parcela a vencer
     */
    public function nextInstallment()
    {
        return $this->installments()
            ->where('status', 'pending')
            ->orderBy('due_date')
            ->first();
    }

    /**
     * Percentual de progresso (quanto já foi pago do principal)
     */
    public function getProgressPercentageAttribute(): float
    {
        if ($this->principal_amount <= 0) {
            return 0;
        }
        return round(($this->principal_paid / $this->principal_amount) * 100, 2);
    }

    /**
     * Saldo restante do principal
     */
    public function getRemainingBalanceAttribute(): float
    {
        return $this->principal_amount - $this->principal_paid;
    }

    /**
     * Recalcular totais baseado nas parcelas
     */
    public function recalculateTotals(): void
    {
        $installments = $this->installments()->get();
        
        $this->total_installments = $installments->count();
        $this->paid_installments = $installments->where('status', 'paid')->count();
        $this->pending_installments = $installments->where('status', 'pending')->count();
        
        // Totais do contrato
        $this->total_interest = $installments->sum('interest_amount');
        $this->total_fees = $installments->sum('fee_amount');
        $this->principal_amount = $installments->sum('principal_amount');
        $this->total_contract_value = $installments->sum('installment_amount');
        
        // Valores pagos
        $paidInstallments = $installments->where('status', 'paid');
        $this->total_paid = $paidInstallments->sum('installment_amount');
        $this->principal_paid = $paidInstallments->sum('principal_amount');
        $this->interest_paid = $paidInstallments->sum('interest_amount');
        $this->fees_paid = $paidInstallments->sum('fee_amount');
        
        // Valores pendentes
        $pendingInstallments = $installments->where('status', 'pending');
        $this->total_pending = $pendingInstallments->sum('installment_amount');
        
        // Calcular taxas de juros
        $this->calculateInterestRates();
        
        // Datas
        $firstInstallment = $installments->sortBy('due_date')->first();
        $lastInstallment = $installments->sortBy('due_date')->last();
        
        if ($firstInstallment) {
            $this->first_due_date = $firstInstallment->due_date;
            $this->start_date = $firstInstallment->due_date;
        }
        if ($lastInstallment) {
            $this->end_date = $lastInstallment->due_date;
        }
        
        // Atualizar status
        if ($this->pending_installments === 0 && $this->paid_installments > 0) {
            $this->status = self::STATUS_PAID_OFF;
        }
        
        $this->save();
    }

    /**
     * Calcular taxas de juros baseado nos dados
     */
    protected function calculateInterestRates(): void
    {
        if ($this->principal_amount <= 0) {
            return;
        }

        // Taxa total do contrato
        $this->total_interest_rate = round(($this->total_interest / $this->principal_amount) * 100, 4);

        // Taxa mensal média
        if ($this->total_installments > 0) {
            $this->monthly_interest_rate = round($this->total_interest_rate / $this->total_installments, 4);
            $this->annual_interest_rate = round($this->monthly_interest_rate * 12, 4);
        }
    }

    /**
     * Scope para contas ativas
     */
    public function scopeActive($query)
    {
        return $query->where('is_active', true);
    }

    /**
     * Scope para um status específico
     */
    public function scopeOfStatus($query, string $status)
    {
        return $query->where('status', $status);
    }
}