<?php

namespace App\Models;

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

class PurchaseOrder extends Model
{
    use HasFactory;

    protected $fillable = [
        'supplier_id',
        'po_number',
        'order_date',
        'expected_date',
        'received_date',
        'status',
        'subtotal',
        'tax',
        'shipping',
        'total',
        'notes',
        'approved_by',
        'received_by',
    ];

    protected $casts = [
        'order_date' => 'date',
        'expected_date' => 'date',
        'received_date' => 'date',
        'subtotal' => 'decimal:2',
        'tax' => 'decimal:2',
        'shipping' => 'decimal:2',
        'total' => 'decimal:2',
    ];

    const STATUS_DRAFT = 'draft';
    const STATUS_PENDING = 'pending';
    const STATUS_ORDERED = 'ordered';
    const STATUS_PARTIAL = 'partial';
    const STATUS_RECEIVED = 'received';
    const STATUS_CANCELLED = 'cancelled';

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

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

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

    public function getStatusBadgeClassAttribute(): string
    {
        return match($this->status) {
            self::STATUS_DRAFT => 'bg-gray-100 text-gray-800 dark:bg-gray-800 dark:text-gray-300',
            self::STATUS_PENDING => 'bg-yellow-100 text-yellow-800 dark:bg-yellow-900 dark:text-yellow-300',
            self::STATUS_ORDERED => 'bg-blue-100 text-blue-800 dark:bg-blue-900 dark:text-blue-300',
            self::STATUS_PARTIAL => 'bg-orange-100 text-orange-800 dark:bg-orange-900 dark:text-orange-300',
            self::STATUS_RECEIVED => 'bg-green-100 text-green-800 dark:bg-green-900 dark:text-green-300',
            self::STATUS_CANCELLED => 'bg-red-100 text-red-800 dark:bg-red-900 dark:text-red-300',
            default => 'bg-gray-100 text-gray-800 dark:bg-gray-800 dark:text-gray-300',
        };
    }

    public function isEditable(): bool
    {
        return in_array($this->status, [self::STATUS_DRAFT, self::STATUS_PENDING]);
    }

    public function canBeReceived(): bool
    {
        return in_array($this->status, [self::STATUS_ORDERED, self::STATUS_PARTIAL]);
    }

    public function getItemsCountAttribute(): int
    {
        return $this->items()->count();
    }

    public function getTotalAmountAttribute(): float
    {
        return $this->items()->sum(\DB::raw('quantity_ordered * unit_cost'));
    }
}