<?php

namespace App\Services\Quote;

use App\Models\Quote\Quote;
use App\Models\Quote\QuoteItem;
use App\Models\Quote\QuoteRevision;
use App\Services\Service;
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Support\Facades\DB;
use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

class QuoteService extends Service
{
    public function __construct(
        private QuoteNumberService $numberService
    ) {}

    /**
     * 견적 목록 조회
     */
    public function index(array $params): LengthAwarePaginator
    {
        $tenantId = $this->tenantId();

        $page = (int) ($params['page'] ?? 1);
        $size = (int) ($params['size'] ?? 20);
        $q = trim((string) ($params['q'] ?? ''));
        $status = $params['status'] ?? null;
        $productCategory = $params['product_category'] ?? null;
        $clientId = $params['client_id'] ?? null;
        $dateFrom = $params['date_from'] ?? null;
        $dateTo = $params['date_to'] ?? null;
        $sortBy = $params['sort_by'] ?? 'registration_date';
        $sortOrder = $params['sort_order'] ?? 'desc';

        $query = Quote::query()->where('tenant_id', $tenantId);

        // 검색어
        if ($q !== '') {
            $query->search($q);
        }

        // 상태 필터
        if ($status) {
            $query->where('status', $status);
        }

        // 제품 카테고리 필터
        if ($productCategory) {
            $query->where('product_category', $productCategory);
        }

        // 발주처 필터
        if ($clientId) {
            $query->where('client_id', $clientId);
        }

        // 날짜 범위
        $query->dateRange($dateFrom, $dateTo);

        // 정렬
        $allowedSortColumns = ['registration_date', 'quote_number', 'client_name', 'total_amount', 'status', 'created_at'];
        if (in_array($sortBy, $allowedSortColumns)) {
            $query->orderBy($sortBy, $sortOrder === 'asc' ? 'asc' : 'desc');
        } else {
            $query->orderBy('registration_date', 'desc');
        }

        $query->orderBy('id', 'desc');

        return $query->paginate($size, ['*'], 'page', $page);
    }

    /**
     * 견적 단건 조회
     */
    public function show(int $id): Quote
    {
        $tenantId = $this->tenantId();

        $quote = Quote::with(['items', 'revisions', 'client', 'creator', 'updater', 'finalizer'])
            ->where('tenant_id', $tenantId)
            ->find($id);

        if (! $quote) {
            throw new NotFoundHttpException(__('error.quote_not_found'));
        }

        return $quote;
    }

    /**
     * 견적 생성
     */
    public function store(array $data): Quote
    {
        $tenantId = $this->tenantId();
        $userId = $this->apiUserId();

        return DB::transaction(function () use ($data, $tenantId, $userId) {
            // 견적번호 생성
            $quoteNumber = $data['quote_number'] ?? $this->numberService->generate($data['product_category'] ?? 'SCREEN');

            // 금액 계산
            $materialCost = (float) ($data['material_cost'] ?? 0);
            $laborCost = (float) ($data['labor_cost'] ?? 0);
            $installCost = (float) ($data['install_cost'] ?? 0);
            $subtotal = $materialCost + $laborCost + $installCost;
            $discountRate = (float) ($data['discount_rate'] ?? 0);
            $discountAmount = $subtotal * ($discountRate / 100);
            $totalAmount = $subtotal - $discountAmount;

            // 견적 생성
            $quote = Quote::create([
                'tenant_id' => $tenantId,
                'quote_number' => $quoteNumber,
                'registration_date' => $data['registration_date'] ?? now()->toDateString(),
                'receipt_date' => $data['receipt_date'] ?? null,
                'author' => $data['author'] ?? null,
                // 발주처 정보
                'client_id' => $data['client_id'] ?? null,
                'client_name' => $data['client_name'] ?? null,
                'manager' => $data['manager'] ?? null,
                'contact' => $data['contact'] ?? null,
                // 현장 정보
                'site_id' => $data['site_id'] ?? null,
                'site_name' => $data['site_name'] ?? null,
                'site_code' => $data['site_code'] ?? null,
                // 제품 정보
                'product_category' => $data['product_category'] ?? Quote::CATEGORY_SCREEN,
                'product_id' => $data['product_id'] ?? null,
                'product_code' => $data['product_code'] ?? null,
                'product_name' => $data['product_name'] ?? null,
                // 규격 정보
                'open_size_width' => $data['open_size_width'] ?? null,
                'open_size_height' => $data['open_size_height'] ?? null,
                'quantity' => $data['quantity'] ?? 1,
                'unit_symbol' => $data['unit_symbol'] ?? null,
                'floors' => $data['floors'] ?? null,
                // 금액 정보
                'material_cost' => $materialCost,
                'labor_cost' => $laborCost,
                'install_cost' => $installCost,
                'subtotal' => $subtotal,
                'discount_rate' => $discountRate,
                'discount_amount' => $discountAmount,
                'total_amount' => $data['total_amount'] ?? $totalAmount,
                // 상태 관리
                'status' => Quote::STATUS_DRAFT,
                'current_revision' => 0,
                'is_final' => false,
                // 기타 정보
                'completion_date' => $data['completion_date'] ?? null,
                'remarks' => $data['remarks'] ?? null,
                'memo' => $data['memo'] ?? null,
                'notes' => $data['notes'] ?? null,
                // 자동산출 입력값
                'calculation_inputs' => $data['calculation_inputs'] ?? null,
                // 감사
                'created_by' => $userId,
            ]);

            // 견적 품목 생성
            if (! empty($data['items']) && is_array($data['items'])) {
                $this->createItems($quote, $data['items'], $tenantId);
            }

            return $quote->load(['items', 'client']);
        });
    }

    /**
     * 견적 수정
     */
    public function update(int $id, array $data): Quote
    {
        $tenantId = $this->tenantId();
        $userId = $this->apiUserId();

        $quote = Quote::where('tenant_id', $tenantId)->find($id);
        if (! $quote) {
            throw new NotFoundHttpException(__('error.quote_not_found'));
        }

        if (! $quote->isEditable()) {
            throw new BadRequestHttpException(__('error.quote_not_editable'));
        }

        return DB::transaction(function () use ($quote, $data, $tenantId, $userId) {
            // 수정 이력 생성
            $this->createRevision($quote, $userId);

            // 금액 재계산
            $materialCost = (float) ($data['material_cost'] ?? $quote->material_cost);
            $laborCost = (float) ($data['labor_cost'] ?? $quote->labor_cost);
            $installCost = (float) ($data['install_cost'] ?? $quote->install_cost);
            $subtotal = $materialCost + $laborCost + $installCost;
            $discountRate = (float) ($data['discount_rate'] ?? $quote->discount_rate);
            $discountAmount = $subtotal * ($discountRate / 100);
            $totalAmount = $subtotal - $discountAmount;

            // 업데이트
            $quote->update([
                'receipt_date' => $data['receipt_date'] ?? $quote->receipt_date,
                'author' => $data['author'] ?? $quote->author,
                // 발주처 정보
                'client_id' => $data['client_id'] ?? $quote->client_id,
                'client_name' => $data['client_name'] ?? $quote->client_name,
                'manager' => $data['manager'] ?? $quote->manager,
                'contact' => $data['contact'] ?? $quote->contact,
                // 현장 정보
                'site_id' => $data['site_id'] ?? $quote->site_id,
                'site_name' => $data['site_name'] ?? $quote->site_name,
                'site_code' => $data['site_code'] ?? $quote->site_code,
                // 제품 정보
                'product_category' => $data['product_category'] ?? $quote->product_category,
                'product_id' => $data['product_id'] ?? $quote->product_id,
                'product_code' => $data['product_code'] ?? $quote->product_code,
                'product_name' => $data['product_name'] ?? $quote->product_name,
                // 규격 정보
                'open_size_width' => $data['open_size_width'] ?? $quote->open_size_width,
                'open_size_height' => $data['open_size_height'] ?? $quote->open_size_height,
                'quantity' => $data['quantity'] ?? $quote->quantity,
                'unit_symbol' => $data['unit_symbol'] ?? $quote->unit_symbol,
                'floors' => $data['floors'] ?? $quote->floors,
                // 금액 정보
                'material_cost' => $materialCost,
                'labor_cost' => $laborCost,
                'install_cost' => $installCost,
                'subtotal' => $subtotal,
                'discount_rate' => $discountRate,
                'discount_amount' => $discountAmount,
                'total_amount' => $data['total_amount'] ?? $totalAmount,
                // 기타 정보
                'completion_date' => $data['completion_date'] ?? $quote->completion_date,
                'remarks' => $data['remarks'] ?? $quote->remarks,
                'memo' => $data['memo'] ?? $quote->memo,
                'notes' => $data['notes'] ?? $quote->notes,
                // 자동산출 입력값
                'calculation_inputs' => $data['calculation_inputs'] ?? $quote->calculation_inputs,
                // 감사
                'updated_by' => $userId,
                'current_revision' => $quote->current_revision + 1,
            ]);

            // 품목 업데이트 (전체 교체)
            if (isset($data['items']) && is_array($data['items'])) {
                $quote->items()->delete();
                $this->createItems($quote, $data['items'], $tenantId);
            }

            return $quote->refresh()->load(['items', 'revisions', 'client']);
        });
    }

    /**
     * 견적 삭제 (Soft Delete)
     */
    public function destroy(int $id): bool
    {
        $tenantId = $this->tenantId();
        $userId = $this->apiUserId();

        $quote = Quote::where('tenant_id', $tenantId)->find($id);
        if (! $quote) {
            throw new NotFoundHttpException(__('error.quote_not_found'));
        }

        if (! $quote->isDeletable()) {
            throw new BadRequestHttpException(__('error.quote_not_deletable'));
        }

        $quote->deleted_by = $userId;
        $quote->save();
        $quote->delete();

        return true;
    }

    /**
     * 견적 일괄 삭제
     */
    public function bulkDestroy(array $ids): int
    {
        $tenantId = $this->tenantId();
        $userId = $this->apiUserId();
        $deletedCount = 0;

        foreach ($ids as $id) {
            $quote = Quote::where('tenant_id', $tenantId)->find($id);
            if ($quote && $quote->isDeletable()) {
                $quote->deleted_by = $userId;
                $quote->save();
                $quote->delete();
                $deletedCount++;
            }
        }

        return $deletedCount;
    }

    /**
     * 최종 확정
     */
    public function finalize(int $id): Quote
    {
        $tenantId = $this->tenantId();
        $userId = $this->apiUserId();

        $quote = Quote::where('tenant_id', $tenantId)->find($id);
        if (! $quote) {
            throw new NotFoundHttpException(__('error.quote_not_found'));
        }

        if (! $quote->isFinalizable()) {
            throw new BadRequestHttpException(__('error.quote_not_finalizable'));
        }

        $quote->update([
            'status' => Quote::STATUS_FINALIZED,
            'is_final' => true,
            'finalized_at' => now(),
            'finalized_by' => $userId,
            'updated_by' => $userId,
        ]);

        return $quote->refresh()->load(['items', 'client', 'finalizer']);
    }

    /**
     * 확정 취소
     */
    public function cancelFinalize(int $id): Quote
    {
        $tenantId = $this->tenantId();
        $userId = $this->apiUserId();

        $quote = Quote::where('tenant_id', $tenantId)->find($id);
        if (! $quote) {
            throw new NotFoundHttpException(__('error.quote_not_found'));
        }

        if ($quote->status !== Quote::STATUS_FINALIZED) {
            throw new BadRequestHttpException(__('error.quote_not_finalized'));
        }

        if ($quote->status === Quote::STATUS_CONVERTED) {
            throw new BadRequestHttpException(__('error.quote_already_converted'));
        }

        $quote->update([
            'status' => Quote::STATUS_DRAFT,
            'is_final' => false,
            'finalized_at' => null,
            'finalized_by' => null,
            'updated_by' => $userId,
        ]);

        return $quote->refresh()->load(['items', 'client']);
    }

    /**
     * 수주 전환
     */
    public function convertToOrder(int $id): Quote
    {
        $tenantId = $this->tenantId();
        $userId = $this->apiUserId();

        $quote = Quote::where('tenant_id', $tenantId)->find($id);
        if (! $quote) {
            throw new NotFoundHttpException(__('error.quote_not_found'));
        }

        if (! $quote->isConvertible()) {
            throw new BadRequestHttpException(__('error.quote_not_convertible'));
        }

        return DB::transaction(function () use ($quote, $userId) {
            // TODO: 수주(Order) 생성 로직 구현
            // $order = $this->orderService->createFromQuote($quote);

            $quote->update([
                'status' => Quote::STATUS_CONVERTED,
                'updated_by' => $userId,
            ]);

            return $quote->refresh()->load(['items', 'client']);
        });
    }

    /**
     * 견적 품목 생성
     */
    private function createItems(Quote $quote, array $items, int $tenantId): void
    {
        foreach ($items as $index => $item) {
            $quantity = (float) ($item['calculated_quantity'] ?? $item['base_quantity'] ?? 1);
            $unitPrice = (float) ($item['unit_price'] ?? 0);
            $totalPrice = $quantity * $unitPrice;

            QuoteItem::create([
                'quote_id' => $quote->id,
                'tenant_id' => $tenantId,
                'item_id' => $item['item_id'] ?? null,
                'item_code' => $item['item_code'] ?? '',
                'item_name' => $item['item_name'] ?? '',
                'specification' => $item['specification'] ?? null,
                'unit' => $item['unit'] ?? 'EA',
                'base_quantity' => $item['base_quantity'] ?? 1,
                'calculated_quantity' => $quantity,
                'unit_price' => $unitPrice,
                'total_price' => $item['total_price'] ?? $totalPrice,
                'formula' => $item['formula'] ?? null,
                'formula_result' => $item['formula_result'] ?? null,
                'formula_source' => $item['formula_source'] ?? null,
                'formula_category' => $item['formula_category'] ?? null,
                'data_source' => $item['data_source'] ?? null,
                'delivery_date' => $item['delivery_date'] ?? null,
                'note' => $item['note'] ?? null,
                'sort_order' => $item['sort_order'] ?? $index,
            ]);
        }
    }

    /**
     * 수정 이력 생성
     */
    private function createRevision(Quote $quote, int $userId): QuoteRevision
    {
        // 현재 견적 데이터 스냅샷
        $previousData = $quote->toArray();
        $previousData['items'] = $quote->items->toArray();

        return QuoteRevision::create([
            'quote_id' => $quote->id,
            'tenant_id' => $quote->tenant_id,
            'revision_number' => $quote->current_revision + 1,
            'revision_date' => now()->toDateString(),
            'revision_by' => $userId,
            'revision_by_name' => auth()->user()?->name ?? 'Unknown',
            'revision_reason' => null, // 별도 입력 받지 않음
            'previous_data' => $previousData,
        ]);
    }
}