<?php

namespace Modules\SupplyChain\Services;

use App\Contact;
use App\Utils\ProductUtil;
use Illuminate\Support\Facades\DB;
use Modules\SupplyChain\Models\RfqLine;
use Modules\SupplyChain\Models\RfqRequest;
use Modules\SupplyChain\Models\RfqResponse;

class RfqService
{
    public function __construct(
        protected ProductUtil $productUtil
    ) {
    }

    public function create(
        int $businessId,
        array $data,
        array $lines,
        ?array $supplierContactIds = null,
        ?int $createdBy = null
    ): RfqRequest {
        return DB::transaction(function () use ($businessId, $data, $lines, $supplierContactIds, $createdBy) {
            $refCount = $this->productUtil->setAndGetReferenceCount('sc_rfq');
            $refNo = $data['ref_no'] ?? $this->productUtil->generateReferenceNumber('sc_rfq', $refCount);

            $rfq = RfqRequest::create([
                'business_id' => $businessId,
                'ref_no' => $refNo,
                'title' => $data['title'],
                'status' => $data['status'] ?? 'draft',
                'due_date' => $data['due_date'] ?? null,
                'holding_entity_id' => $data['holding_entity_id'] ?? null,
                'notes' => $data['notes'] ?? null,
                'created_by' => $createdBy ?? auth()->id(),
            ]);

            foreach ($lines as $line) {
                RfqLine::create([
                    'rfq_id' => $rfq->id,
                    'product_id' => $line['product_id'],
                    'variation_id' => $line['variation_id'] ?? null,
                    'qty' => $line['qty'],
                    'specs' => $line['specs'] ?? null,
                ]);
            }

            $this->inviteSuppliers($rfq, $supplierContactIds);

            return $rfq->fresh(['lines', 'responses.contact']);
        });
    }

    public function update(RfqRequest $rfq, array $data, ?array $lines = null): RfqRequest
    {
        return DB::transaction(function () use ($rfq, $data, $lines) {
            $rfq->update([
                'title' => $data['title'] ?? $rfq->title,
                'status' => $data['status'] ?? $rfq->status,
                'due_date' => $data['due_date'] ?? $rfq->due_date,
                'holding_entity_id' => $data['holding_entity_id'] ?? $rfq->holding_entity_id,
                'notes' => $data['notes'] ?? $rfq->notes,
            ]);

            if ($lines !== null) {
                $rfq->lines()->delete();
                foreach ($lines as $line) {
                    RfqLine::create([
                        'rfq_id' => $rfq->id,
                        'product_id' => $line['product_id'],
                        'variation_id' => $line['variation_id'] ?? null,
                        'qty' => $line['qty'],
                        'specs' => $line['specs'] ?? null,
                    ]);
                }
            }

            return $rfq->fresh(['lines', 'responses.contact']);
        });
    }

    public function inviteSuppliers(RfqRequest $rfq, ?array $contactIds = null): int
    {
        if ($contactIds === null) {
            $contactIds = Contact::where('business_id', $rfq->business_id)
                ->whereIn('type', ['supplier', 'both'])
                ->pluck('id')
                ->all();
        }

        $created = 0;
        foreach ($contactIds as $contactId) {
            $response = RfqResponse::firstOrCreate(
                ['rfq_id' => $rfq->id, 'contact_id' => (int) $contactId],
                ['status' => 'pending']
            );
            if ($response->wasRecentlyCreated) {
                $created++;
            }
        }

        return $created;
    }

    public function submitResponse(
        RfqRequest $rfq,
        int $contactId,
        float $quotedPrice,
        int $leadDays,
        ?string $notes = null
    ): RfqResponse {
        return RfqResponse::updateOrCreate(
            ['rfq_id' => $rfq->id, 'contact_id' => $contactId],
            [
                'quoted_price' => $quotedPrice,
                'lead_days' => $leadDays,
                'status' => 'submitted',
                'notes' => $notes,
            ]
        );
    }

    public function award(RfqRequest $rfq, int $contactId): RfqRequest
    {
        return DB::transaction(function () use ($rfq, $contactId) {
            $rfq->responses()->update(['status' => 'rejected']);
            RfqResponse::where('rfq_id', $rfq->id)
                ->where('contact_id', $contactId)
                ->update(['status' => 'awarded']);

            $rfq->update(['status' => 'awarded']);

            return $rfq->fresh(['lines', 'responses.contact']);
        });
    }

    public function open(RfqRequest $rfq): RfqRequest
    {
        $rfq->update(['status' => 'open']);

        return $rfq->fresh(['lines', 'responses.contact']);
    }

    public function close(RfqRequest $rfq): RfqRequest
    {
        $rfq->update(['status' => 'closed']);

        return $rfq->fresh(['lines', 'responses.contact']);
    }

    /**
     * Create RFQ from MRP shortage lines.
     *
     * @param  array<int, array<string, mixed>>  $shortages
     */
    public function createFromMrpShortages(
        int $businessId,
        array $shortages,
        ?string $title = null,
        ?array $supplierContactIds = null
    ): RfqRequest {
        $lines = [];
        foreach ($shortages as $shortage) {
            $productId = ! empty($shortage['product_id'])
                ? (int) $shortage['product_id']
                : null;

            if (! $productId && ! empty($shortage['variation_id'])) {
                $productId = (int) \App\Variation::where('id', (int) $shortage['variation_id'])->value('product_id');
            }

            if (empty($shortage['variation_id']) || ! $productId) {
                continue;
            }
            $lines[] = [
                'product_id' => $productId,
                'variation_id' => (int) $shortage['variation_id'],
                'qty' => (float) ($shortage['shortage_qty'] ?? $shortage['qty'] ?? 0),
                'specs' => $shortage['item_name'] ?? null,
            ];
        }

        return $this->create(
            $businessId,
            [
                'title' => $title ?? __('supplychain::lang.rfq_from_mrp'),
                'status' => 'open',
                'due_date' => now()->addDays(14)->toDateString(),
            ],
            $lines,
            $supplierContactIds
        );
    }
}