<?php

namespace Modules\ContractorManagement\Models;

use App\Traits\HasPublicIdentifier;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Modules\ContractorManagement\Enums\InvoiceStatus;
use Modules\ApprovalWorkflow\Traits\HasApprovable;
use Modules\ProjectManagement\Models\Project;

class ContractorInvoice extends Model
{
    use HasApprovable, HasPublicIdentifier;

    protected $fillable = [
        'contractor_id', 'project_id', 'invoice_number',
        'status', 'amount', 'description',
        'invoice_date', 'due_date', 'paid_at',
    ];

    protected function casts(): array
    {
        return [
            'status' => InvoiceStatus::class,
            'amount' => 'decimal:2',
            'invoice_date' => 'date',
            'due_date' => 'date',
            'paid_at' => 'datetime',
        ];
    }

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

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

    public function payments(): HasMany
    {
        return $this->hasMany(ContractorPayment::class);
    }

    public function transitionTo(InvoiceStatus $newStatus): void
    {
        $allowed = $this->status->allowedTransitions();
        if (!in_array($newStatus, $allowed)) {
            throw new \InvalidArgumentException(
                "Cannot transition invoice from {$this->status->label()} to {$newStatus->label()}"
            );
        }

        $updates = ['status' => $newStatus];
        if ($newStatus === InvoiceStatus::Paid) {
            $updates['paid_at'] = now();
        }

        $this->update($updates);
    }

    public function getTotalPaidAttribute(): float
    {
        return (float) $this->payments()->sum('amount');
    }
}