<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use App\Traits\Auditable;

class CustomerCredit extends Model
{
    use Auditable;

    protected $fillable = [
        'user_id',
        'currency_code',
        'amount',
        'settled_amount',
        'status',
        'reason',
        'reference',
        'shipment_id',
        'granted_by',
        'granted_at',
    ];

    protected $casts = [
        'amount' => 'decimal:2',
        'settled_amount' => 'decimal:2',
        'granted_at' => 'datetime',
    ];

    // ─── Relationships ───────────────────────────────

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

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

    public function grantedBy(): BelongsTo
    {
        return $this->belongsTo(User::class, 'granted_by');
    }

    public function settlements(): HasMany
    {
        return $this->hasMany(CreditSettlement::class)->orderBy('settled_at', 'desc');
    }

    // ─── Helpers ─────────────────────────────────────

    /**
     * مانده بدهی به ارز خارجی = amount - settled_amount
     */
    public function getBalanceAttribute(): float
    {
        return (float) $this->amount - (float) $this->settled_amount;
    }

    public function isOpen(): bool
    {
        return in_array($this->status, ['open', 'partially_settled'], true);
    }

    public function isSettled(): bool
    {
        return $this->status === 'settled';
    }

    /**
     * بازمحاسبه status بر اساس settled_amount.
     */
    public function recomputeStatus(): void
    {
        $balance = $this->balance;

        if ($balance <= 0.005) {
            $this->status = 'settled';
        } elseif ((float) $this->settled_amount > 0) {
            $this->status = 'partially_settled';
        } else {
            $this->status = 'open';
        }

        $this->save();
    }
}