<?php

namespace App\Models\Tenant;

use App\Models\Concerns\BelongsToTenant;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\SoftDeletes;
use Spatie\MediaLibrary\HasMedia;
use Spatie\MediaLibrary\InteractsWithMedia;

class Part extends Model implements HasMedia
{
    use BelongsToTenant, InteractsWithMedia, SoftDeletes;

    public function registerMediaCollections(): void
    {
        // Multi-image gallery (catalog uses imageUrl() = first; detail page renders all).
        $this->addMediaCollection('image');
    }

    public function imageUrl(): ?string
    {
        $m = $this->getFirstMedia('image');
        if (! $m) return null;
        if (! @file_exists($m->getPath())) return null;
        return $m->getUrl();
    }

    /** @return list<string> All published image URLs (excluding any whose file is missing). */
    public function imageUrls(): array
    {
        return $this->getMedia('image')
            ->filter(fn ($m) => @file_exists($m->getPath()))
            ->map(fn ($m) => $m->getUrl())
            ->values()->all();
    }

    public const CATEGORIES = [
        'Ulei', 'Filtre', 'Frâne', 'Suspensie', 'Lichide',
        'Distribuție', 'Anvelope', 'Electrică', 'Caroserie', 'Altele',
    ];

    protected $fillable = [
        'company_id', 'name', 'article', 'brand', 'category',
        'qty', 'qty_reserved', 'unit', 'min_qty',
        'buy_price', 'sell_price', 'hidden_markup_pct',
        'location', 'barcode', 'preferred_supplier_id',
        'is_active', 'is_published', 'notes',
    ];

    protected $casts = [
        'qty' => 'decimal:2',
        'qty_reserved' => 'decimal:3',
        'min_qty' => 'decimal:2',
        'buy_price' => 'decimal:2',
        'sell_price' => 'decimal:2',
        'hidden_markup_pct' => 'decimal:2',
        'is_active' => 'boolean',
        'is_published' => 'boolean',
    ];

    /** Internal cost+hidden markup (NOT shown to customer). Used for margin analytics + B2B contract pricing. */
    public function internalCostWithHiddenMarkup(): float
    {
        $base = (float) $this->buy_price;
        $pct = (float) ($this->hidden_markup_pct ?: 0);
        return round($base * (1 + $pct / 100), 2);
    }

    public function preferredSupplier(): BelongsTo
    {
        return $this->belongsTo(Supplier::class, 'preferred_supplier_id');
    }

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

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

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

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

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

    public function scopePublished($q)
    {
        return $q->where('is_active', true)->where('is_published', true);
    }

    /**
     * Search published parts by free text against name / article / brand and
     * any registered cross-reference article. Returns a query builder.
     */
    public static function searchPublished(?string $term)
    {
        $q = static::published();
        if ($term = trim((string) $term)) {
            $like = '%' . $term . '%';
            $q->where(function ($w) use ($like, $term) {
                $w->where('name', 'like', $like)
                  ->orWhere('article', 'like', $like)
                  ->orWhere('brand', 'like', $like)
                  ->orWhereHas('crossRefs', fn ($c) => $c->where('cross_article', 'like', $like));
            });
        }
        return $q;
    }

    /** Live total across all batches of all warehouses (source of truth). */
    public function qtyOnHand(?int $warehouseId = null): float
    {
        $q = $this->batches()->newQuery()->where('part_id', $this->id);
        if ($warehouseId) $q->where('warehouse_id', $warehouseId);
        return (float) $q->sum('qty_remaining');
    }

    /** Available for new reservations = on hand − already reserved. */
    public function qtyAvailable(?int $warehouseId = null): float
    {
        return max(0.0, $this->qtyOnHand($warehouseId) - (float) $this->qty_reserved);
    }

    public function isLow(): bool
    {
        return (float) $this->qty <= (float) $this->min_qty;
    }

    public function isOut(): bool
    {
        return (float) $this->qty <= 0;
    }

    /**
     * Legacy direct-stock adjustment.
     * NOTE: this only moves the cached `qty` column. Real stock changes
     * should go through WarehouseService so batches + events stay in sync.
     */
    public function adjustStock(float $delta, ?string $reason = null): void
    {
        $this->qty = max(0, (float) $this->qty + $delta);
        $this->save();
    }
}
