<?php

namespace App\Http\Controllers\Api\V1;

use App\Helpers\ApiResponse;
use App\Http\Controllers\Controller;
use App\Http\Requests\V1\Stock\StoreStockAdjustmentRequest;
use App\Services\StockService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

class StockController extends Controller
{
    public function __construct(
        private readonly StockService $service
    ) {}

    /**
     * 재고 목록 조회
     */
    public function index(Request $request): JsonResponse
    {
        $params = $request->only([
            'search',
            'item_type',
            'item_category',
            'status',
            'location',
            'sort_by',
            'sort_dir',
            'per_page',
            'page',
            'start_date',
            'end_date',
        ]);

        $stocks = $this->service->index($params);

        return ApiResponse::success($stocks, __('message.fetched'));
    }

    /**
     * 재고 통계 조회
     */
    public function stats(): JsonResponse
    {
        $stats = $this->service->stats();

        return ApiResponse::success($stats, __('message.fetched'));
    }

    /**
     * 재고 상세 조회 (LOT 포함)
     */
    public function show(int $id): JsonResponse
    {
        try {
            $stock = $this->service->show($id);

            return ApiResponse::success($stock, __('message.fetched'));
        } catch (\Illuminate\Database\Eloquent\ModelNotFoundException $e) {
            return ApiResponse::error(__('error.stock.not_found'), 404);
        }
    }

    /**
     * 품목유형별 통계 조회
     */
    public function statsByItemType(): JsonResponse
    {
        $stats = $this->service->statsByItemType();

        return ApiResponse::success($stats, __('message.fetched'));
    }

    /**
     * 재고 수정 (안전재고, 최대재고, 사용상태)
     */
    public function update(int $id, Request $request): JsonResponse
    {
        try {
            $data = $request->validate([
                'safety_stock' => 'nullable|numeric|min:0',
                'max_stock' => 'nullable|numeric|min:0',
                'is_active' => 'nullable|boolean',
            ]);

            // 최대재고가 설정된 경우 안전재고 이상이어야 함
            if (isset($data['max_stock']) && $data['max_stock'] > 0
                && isset($data['safety_stock']) && $data['safety_stock'] > $data['max_stock']) {
                return ApiResponse::error('최대재고는 안전재고 이상이어야 합니다.', 422);
            }

            $stock = $this->service->updateStock($id, $data);

            return ApiResponse::success($stock, __('message.updated'));
        } catch (\Illuminate\Database\Eloquent\ModelNotFoundException $e) {
            return ApiResponse::error(__('error.stock.not_found'), 404);
        }
    }

    /**
     * 재고 조정 이력 조회
     */
    public function adjustments(int $id): JsonResponse
    {
        try {
            $adjustments = $this->service->adjustments($id);

            return ApiResponse::success($adjustments, __('message.fetched'));
        } catch (\Illuminate\Database\Eloquent\ModelNotFoundException $e) {
            return ApiResponse::error(__('error.stock.not_found'), 404);
        }
    }

    /**
     * 재고 조정 등록
     */
    public function storeAdjustment(int $id, StoreStockAdjustmentRequest $request): JsonResponse
    {
        try {
            $result = $this->service->createAdjustment($id, $request->validated());

            return ApiResponse::success($result, __('message.created'));
        } catch (\Illuminate\Database\Eloquent\ModelNotFoundException $e) {
            return ApiResponse::error(__('error.stock.not_found'), 404);
        }
    }

    /**
     * 재고 거래이력 (사용현황)
     * GET /api/v1/stocks/{id}/transactions
     */
    public function transactions(int $id): JsonResponse
    {
        $tenantId = app('tenant_id');

        $stock = DB::table('stocks')
            ->where('tenant_id', $tenantId)
            ->where('item_id', $id)
            ->first();

        if (! $stock) {
            // item_id로 직접 검색
            $stock = DB::table('stocks')
                ->where('tenant_id', $tenantId)
                ->where('id', $id)
                ->first();
        }

        $stockId = $stock?->id;
        $itemCode = $stock?->item_code;

        $transactions = DB::table('stock_transactions')
            ->where('tenant_id', $tenantId)
            ->where(function ($q) use ($stockId, $itemCode) {
                if ($stockId) {
                    $q->where('stock_id', $stockId);
                }
                if ($itemCode) {
                    $q->orWhere('item_code', $itemCode);
                }
            })
            ->orderByDesc('created_at')
            ->limit(100)
            ->get([
                'id', 'type', 'qty', 'balance_qty', 'reference_type', 'reference_id',
                'lot_no', 'reason', 'remark', 'item_code', 'item_name', 'created_by', 'created_at',
            ]);

        // 참조 정보 보강 (work_order 번호 등)
        $woIds = $transactions->where('reference_type', 'work_order_input')
            ->pluck('reference_id')->unique()->values();
        $woMap = [];
        if ($woIds->isNotEmpty()) {
            $woMap = DB::table('work_orders')
                ->whereIn('id', $woIds)
                ->pluck('work_order_no', 'id')
                ->toArray();
        }

        $data = $transactions->map(function ($tx) use ($woMap) {
            $refLabel = match ($tx->reference_type) {
                'work_order_input' => '자재투입',
                'work_order_input_cancel' => '자재투입 취소',
                'work_order_input_replace' => '자재투입 교체',
                'receiving' => '입고',
                'adjustment' => '재고조정',
                'shipment' => '출하',
                default => $tx->reference_type ?? '-',
            };
            $refNo = $woMap[$tx->reference_id] ?? null;

            return [
                'id' => $tx->id,
                'type' => $tx->type,
                'type_label' => $refLabel,
                'qty' => (float) $tx->qty,
                'balance_qty' => (float) $tx->balance_qty,
                'reference_type' => $tx->reference_type,
                'reference_id' => $tx->reference_id,
                'reference_no' => $refNo,
                'lot_no' => $tx->lot_no,
                'reason' => $tx->reason,
                'remark' => $tx->remark,
                'item_code' => $tx->item_code,
                'item_name' => $tx->item_name,
                'created_at' => $tx->created_at,
            ];
        });

        return ApiResponse::success([
            'item_code' => $stock?->item_code,
            'item_name' => $stock?->item_name,
            'current_qty' => (float) ($stock?->stock_qty ?? 0),
            'available_qty' => (float) ($stock?->available_qty ?? 0),
            'transactions' => $data,
        ]);
    }
}