<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Invoice extends Model
{
    use HasFactory;

    protected $fillable = [
        'client_id',
        'group_id',
        'source_quote_id',
        'invoice_number',
        'status',
        'invoice_date',
        'due_date',
        'currency',
        'total_ht',
        'total_tva',
        'total_ttc',
        'e_invoicing_channel_id',
        'e_invoice_status',
    ];

    protected static function booted()
    {
        static::creating(function ($invoice) {
            // Auto-generate invoice number if not provided
            if (empty($invoice->invoice_number)) {
                $prefix = 'FAC-' . now()->format('Ym') . '-';
                $lastInvoice = self::where('invoice_number', 'like', $prefix . '%')
                    ->orderBy('invoice_number', 'desc')
                    ->first();

                if ($lastInvoice) {
                    $lastNumber = intval(substr($lastInvoice->invoice_number, -4));
                    $newNumber = $lastNumber + 1;
                } else {
                    $newNumber = 1;
                }

                $invoice->invoice_number = $prefix . str_pad((string)$newNumber, 4, '0', STR_PAD_LEFT);
            }
        });
    }

    protected $casts = [
        'invoice_date' => 'date',
        'due_date' => 'date',
        'total_ht' => 'decimal:2',
        'total_tva' => 'decimal:2',
        'total_ttc' => 'decimal:2',
    ];

    public function client()
    {
        return $this->belongsTo(Client::class);
    }

    public function group()
    {
        return $this->belongsTo(ClientGroup::class, 'group_id');
    }

    public function lines()
    {
        return $this->hasMany(InvoiceLine::class);
    }

    public function sourceQuote()
    {
        return $this->belongsTo(Quote::class, 'source_quote_id');
    }

    public function eInvoicingChannel()
    {
        return $this->belongsTo(EInvoicingChannel::class);
    }

    public function history()
    {
        return $this->hasMany(DocumentStatusHistory::class, 'document_id')
                    ->where('document_type', 'invoice')
                    ->orderBy('changed_at', 'desc');
    }
}