<?php

namespace App\Http\Controllers\Sales;

use App\Http\Controllers\Controller;
use App\Models\Sales\SalesProduct;
use App\Models\Sales\SalesProductCategory;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\View\View;

/**
 * 영업 상품관리 컨트롤러 (HQ 전용)
 */
class SalesProductController extends Controller
{
    /**
     * 상품관리 메인 화면
     */
    public function index(Request $request): View|Response
    {
        // HTMX 요청인 경우 전체 페이지 리로드 (Alpine.js 스크립트 실행 필요)
        if ($request->header('HX-Request')) {
            return response('', 200)->header('HX-Redirect', route('sales.products.index'));
        }

        $categories = SalesProductCategory::active()
            ->ordered()
            ->with(['products' => fn ($q) => $q->ordered()])
            ->get();

        $currentCategoryCode = $request->input('category', $categories->first()?->code);
        $currentCategory = $categories->firstWhere('code', $currentCategoryCode) ?? $categories->first();

        return view('sales.products.index', compact('categories', 'currentCategory'));
    }

    /**
     * 상품 목록 (HTMX용)
     */
    public function productList(Request $request): View
    {
        $categoryCode = $request->input('category');
        $category = SalesProductCategory::where('code', $categoryCode)
            ->with(['products' => fn ($q) => $q->ordered()])
            ->first();

        return view('sales.products.partials.product-list', compact('category'));
    }

    /**
     * 상품 저장
     */
    public function store(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'category_id' => 'required|exists:sales_product_categories,id',
            'code' => 'required|string|max:50',
            'name' => 'required|string|max:100',
            'description' => 'nullable|string',
            'development_fee' => 'required|numeric|min:0',
            'registration_fee' => 'required|numeric|min:0',
            'subscription_fee' => 'required|numeric|min:0',
            'partner_commission_rate' => 'nullable|numeric|min:0|max:100',
            'manager_commission_rate' => 'nullable|numeric|min:0|max:100',
            'allow_flexible_pricing' => 'boolean',
            'is_required' => 'boolean',
        ]);

        // 코드 중복 체크
        $exists = SalesProduct::where('category_id', $validated['category_id'])
            ->where('code', $validated['code'])
            ->exists();

        if ($exists) {
            return response()->json([
                'success' => false,
                'message' => '이미 존재하는 상품 코드입니다.',
            ], 422);
        }

        // 순서 설정 (마지막)
        $maxOrder = SalesProduct::where('category_id', $validated['category_id'])->max('display_order') ?? 0;
        $validated['display_order'] = $maxOrder + 1;
        $validated['partner_commission_rate'] = $validated['partner_commission_rate'] ?? 20.00;
        $validated['manager_commission_rate'] = $validated['manager_commission_rate'] ?? 5.00;

        $product = SalesProduct::create($validated);

        return response()->json([
            'success' => true,
            'message' => '상품이 등록되었습니다.',
            'product' => $product,
        ]);
    }

    /**
     * 상품 수정
     */
    public function update(Request $request, int $id): JsonResponse
    {
        $product = SalesProduct::findOrFail($id);

        $validated = $request->validate([
            'name' => 'sometimes|string|max:100',
            'description' => 'nullable|string',
            'development_fee' => 'sometimes|numeric|min:0',
            'registration_fee' => 'sometimes|numeric|min:0',
            'subscription_fee' => 'sometimes|numeric|min:0',
            'partner_commission_rate' => 'nullable|numeric|min:0|max:100',
            'manager_commission_rate' => 'nullable|numeric|min:0|max:100',
            'allow_flexible_pricing' => 'boolean',
            'is_required' => 'boolean',
            'is_active' => 'boolean',
        ]);

        $product->update($validated);

        return response()->json([
            'success' => true,
            'message' => '상품이 수정되었습니다.',
            'product' => $product->fresh(),
        ]);
    }

    /**
     * 상품 삭제 (soft delete)
     */
    public function destroy(int $id): JsonResponse
    {
        $product = SalesProduct::findOrFail($id);
        $product->delete();

        return response()->json([
            'success' => true,
            'message' => '상품이 삭제되었습니다.',
        ]);
    }

    /**
     * 활성화 토글
     */
    public function toggleActive(int $id): JsonResponse
    {
        $product = SalesProduct::findOrFail($id);
        $product->update(['is_active' => ! $product->is_active]);

        return response()->json([
            'success' => true,
            'message' => $product->is_active ? '상품이 활성화되었습니다.' : '상품이 비활성화되었습니다.',
            'is_active' => $product->is_active,
        ]);
    }

    /**
     * 순서 변경
     */
    public function reorder(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'orders' => 'required|array',
            'orders.*.id' => 'required|exists:sales_products,id',
            'orders.*.order' => 'required|integer|min:0',
        ]);

        foreach ($validated['orders'] as $item) {
            SalesProduct::where('id', $item['id'])->update(['display_order' => $item['order']]);
        }

        return response()->json([
            'success' => true,
            'message' => '순서가 변경되었습니다.',
        ]);
    }

    // ==================== 카테고리 관리 ====================

    /**
     * 카테고리 목록
     */
    public function categories(): JsonResponse
    {
        $categories = SalesProductCategory::ordered()->get();

        return response()->json([
            'success' => true,
            'data' => $categories,
        ]);
    }

    /**
     * 카테고리 생성
     */
    public function storeCategory(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'code' => 'required|string|max:50|unique:sales_product_categories,code',
            'name' => 'required|string|max:100',
            'description' => 'nullable|string',
            'base_storage' => 'nullable|string|max:20',
        ]);

        $maxOrder = SalesProductCategory::max('display_order') ?? 0;
        $validated['display_order'] = $maxOrder + 1;

        $category = SalesProductCategory::create($validated);

        return response()->json([
            'success' => true,
            'message' => '카테고리가 생성되었습니다.',
            'category' => $category,
        ]);
    }

    /**
     * 카테고리 수정
     */
    public function updateCategory(Request $request, int $id): JsonResponse
    {
        $category = SalesProductCategory::findOrFail($id);

        $validated = $request->validate([
            'name' => 'sometimes|string|max:100',
            'description' => 'nullable|string',
            'base_storage' => 'nullable|string|max:20',
            'is_active' => 'boolean',
        ]);

        $category->update($validated);

        return response()->json([
            'success' => true,
            'message' => '카테고리가 수정되었습니다.',
            'category' => $category->fresh(),
        ]);
    }

    /**
     * 카테고리 삭제
     */
    public function deleteCategory(int $id): JsonResponse
    {
        $category = SalesProductCategory::findOrFail($id);

        // 상품이 있으면 삭제 불가
        if ($category->products()->exists()) {
            return response()->json([
                'success' => false,
                'message' => '상품이 있는 카테고리는 삭제할 수 없습니다.',
            ], 422);
        }

        $category->delete();

        return response()->json([
            'success' => true,
            'message' => '카테고리가 삭제되었습니다.',
        ]);
    }

    // ==================== API (영업 시나리오용) ====================

    /**
     * 상품 목록 API (카테고리 포함)
     */
    public function getProductsApi(): JsonResponse
    {
        $categories = SalesProductCategory::active()
            ->ordered()
            ->with(['products' => fn ($q) => $q->active()->ordered()])
            ->get();

        return response()->json([
            'success' => true,
            'data' => $categories,
        ]);
    }
}