<?php

namespace Modules\IndustrialEngineering\Services;

use Modules\IndustrialEngineering\Models\Bom;
use Modules\IndustrialEngineering\Models\CpqConfiguration;
use Modules\IndustrialEngineering\Models\CpqOption;
use Modules\IndustrialEngineering\Models\CpqOptionGroup;
use Modules\IndustrialEngineering\Models\CpqRule;

class CpqService
{
    public function __construct(
        protected LiveBomCostingService $liveBomCosting,
        protected BomTreeService $bomTree
    ) {
    }

    public function getConfigurator(int $businessId, int $productPlatformId): array
    {
        $groups = CpqOptionGroup::forBusiness($businessId)
            ->where('product_platform_id', $productPlatformId)
            ->with('options')
            ->orderBy('sort_order')
            ->get();

        return [
            'groups' => $groups,
            'rules' => CpqRule::forBusiness($businessId)->where('is_active', true)->orderBy('priority')->get(),
        ];
    }

    public function buildConfiguration(int $businessId, array $data): CpqConfiguration
    {
        $selectedOptions = $data['selected_options'] ?? [];
        $bomSnapshot = $this->buildBomSnapshot($businessId, $data['base_bom_id'] ?? null, $selectedOptions);
        $price = $this->calculatePrice($businessId, $bomSnapshot, $selectedOptions);

        return CpqConfiguration::create([
            'business_id' => $businessId,
            'product_platform_id' => $data['product_platform_id'] ?? null,
            'name' => $data['name'] ?? 'Configuration',
            'ref_no' => $this->nextRef($businessId),
            'status' => 'draft',
            'contact_id' => $data['contact_id'] ?? null,
            'selected_options' => $selectedOptions,
            'bom_snapshot' => $bomSnapshot,
            'quoted_price' => $price,
            'created_by' => auth()->id(),
        ]);
    }

    public function applyRules(array $selectedOptionIds, int $businessId): array
    {
        $rules = CpqRule::forBusiness($businessId)->where('is_active', true)->orderBy('priority')->get();
        $result = $selectedOptionIds;

        foreach ($rules as $rule) {
            $conditions = $rule->conditions ?? [];
            $ifSelected = $conditions['if_option_ids'] ?? [];
            if (empty($ifSelected) || count(array_intersect($ifSelected, $result)) === count($ifSelected)) {
                foreach ($rule->actions['add_option_ids'] ?? [] as $addId) {
                    if (! in_array($addId, $result)) {
                        $result[] = $addId;
                    }
                }
                foreach ($rule->actions['remove_option_ids'] ?? [] as $removeId) {
                    $result = array_values(array_diff($result, [$removeId]));
                }
            }
        }

        return $result;
    }

    protected function buildBomSnapshot(int $businessId, ?int $baseBomId, array $selectedOptionIds): array
    {
        $lines = [];
        if ($baseBomId) {
            $bom = Bom::forBusiness($businessId)->with('lines')->find($baseBomId);
            if ($bom) {
                $lines = $bom->lines->map(fn ($l) => [
                    'item_master_id' => $l->item_master_id,
                    'quantity' => $l->quantity,
                ])->all();
            }
        }

        $options = CpqOption::forBusiness($businessId)->whereIn('id', $selectedOptionIds)->get();
        foreach ($options as $option) {
            foreach ($option->bom_additions ?? [] as $add) {
                $lines[] = $add;
            }
            foreach ($option->bom_removals ?? [] as $remove) {
                $lines = array_filter($lines, fn ($l) => ($l['item_master_id'] ?? null) != ($remove['item_master_id'] ?? null));
            }
        }

        return ['lines' => array_values($lines), 'base_bom_id' => $baseBomId];
    }

    protected function calculatePrice(int $businessId, array $bomSnapshot, array $selectedOptionIds): float
    {
        $price = 0.0;
        if (! empty($bomSnapshot['base_bom_id'])) {
            $bom = Bom::forBusiness($businessId)->find($bomSnapshot['base_bom_id']);
            if ($bom) {
                $costing = $this->liveBomCosting->analyze($bom, 1);
                $price += (float) ($costing['totals']['live_material'] ?? 0);
            }
        }

        $options = CpqOption::forBusiness($businessId)->whereIn('id', $selectedOptionIds)->get();
        foreach ($options as $option) {
            $price += (float) $option->price_delta;
        }

        return round($price, 4);
    }

    protected function nextRef(int $businessId): string
    {
        $count = CpqConfiguration::forBusiness($businessId)->withTrashed()->count() + 1;

        return 'CPQ-'.str_pad((string) $count, 5, '0', STR_PAD_LEFT);
    }
}