<?php

namespace Modules\IndustrialEngineering\Services;

use Modules\IndustrialEngineering\Models\Bom;
use Modules\IndustrialEngineering\Models\ItemMaster;

/**
 * Validates integration health; blocks critical ops until required links exist.
 */
class ConnectionGateService
{
    public function __construct(
        protected BomService $bomService,
        protected LiveBomCostingService $liveCosting
    ) {
    }

    public function assessBom(Bom $bom, float $plannedQty = 1): array
    {
        $analysis = $this->liveCosting->analyze($bom, $plannedQty);
        $leafParts = collect($analysis['leaf_lines']);
        $unlinked = $leafParts->filter(fn ($l) => empty($l['variation_id']));
        $linked = $leafParts->filter(fn ($l) => ! empty($l['variation_id']));
        $assemblies = $leafParts->filter(fn ($l) => in_array($l['item_type'], ['assembly', 'subassembly', 'device'], true));

        $blockers = [];
        if ($leafParts->isEmpty()) {
            $blockers[] = __('industrialengineering::lang.gate_no_bom_leaves');
        }

        $warnings = [];
        foreach ($unlinked as $row) {
            $warnings[] = __('industrialengineering::lang.gate_unlinked_item', [
                'code' => $row['item_code'],
                'name' => $row['item_name'],
            ]);
        }

        return [
            'can_run_mrp' => empty($blockers) && $unlinked->isEmpty(),
            'can_run_mrp_with_warnings' => empty($blockers) && $unlinked->isNotEmpty(),
            'blockers' => $blockers,
            'warnings' => $warnings,
            'stats' => [
                'total_leaves' => $leafParts->count(),
                'erp_linked' => $linked->count(),
                'unlinked' => $unlinked->count(),
                'assemblies' => $assemblies->count(),
                'shortage_count' => count($analysis['shortages']),
            ],
            'analysis' => $analysis,
        ];
    }

    public function assertMrpAllowed(Bom $bom, float $plannedQty = 1, bool $force = false): void
    {
        $gate = $this->assessBom($bom, $plannedQty);

        if (! empty($gate['blockers'])) {
            throw new \RuntimeException(implode("\n", $gate['blockers']));
        }

        if (! empty($gate['warnings']) && ! $force) {
            throw new \RuntimeException(
                __('industrialengineering::lang.gate_mrp_blocked_unlinked')."\n".
                implode("\n", array_slice($gate['warnings'], 0, 5)).
                (count($gate['warnings']) > 5 ? "\n..." : '')
            );
        }
    }
}