<?php

namespace App\Services;

use App\Models\Production\WorkOrder;
use App\Models\Production\WorkOrderBendingDetail;
use Illuminate\Support\Facades\DB;
use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

class WorkOrderService extends Service
{
    /**
     * 목록 조회 (검색/필터링/페이징)
     */
    public function index(array $params)
    {
        $tenantId = $this->tenantId();

        $page = (int) ($params['page'] ?? 1);
        $size = (int) ($params['size'] ?? 20);
        $q = trim((string) ($params['q'] ?? ''));
        $status = $params['status'] ?? null;
        $processType = $params['process_type'] ?? null;
        $assigneeId = $params['assignee_id'] ?? null;
        $teamId = $params['team_id'] ?? null;
        $scheduledFrom = $params['scheduled_from'] ?? null;
        $scheduledTo = $params['scheduled_to'] ?? null;

        $query = WorkOrder::query()
            ->where('tenant_id', $tenantId)
            ->with(['assignee:id,name', 'team:id,name', 'salesOrder:id,order_no']);

        // 검색어
        if ($q !== '') {
            $query->where(function ($qq) use ($q) {
                $qq->where('work_order_no', 'like', "%{$q}%")
                    ->orWhere('project_name', 'like', "%{$q}%");
            });
        }

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

        // 공정유형 필터
        if ($processType !== null) {
            $query->where('process_type', $processType);
        }

        // 담당자 필터
        if ($assigneeId !== null) {
            $query->where('assignee_id', $assigneeId);
        }

        // 팀 필터
        if ($teamId !== null) {
            $query->where('team_id', $teamId);
        }

        // 예정일 범위
        if ($scheduledFrom !== null) {
            $query->where('scheduled_date', '>=', $scheduledFrom);
        }
        if ($scheduledTo !== null) {
            $query->where('scheduled_date', '<=', $scheduledTo);
        }

        $query->orderByDesc('created_at');

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

    /**
     * 통계 조회
     */
    public function stats(): array
    {
        $tenantId = $this->tenantId();

        $counts = WorkOrder::where('tenant_id', $tenantId)
            ->select('status', DB::raw('count(*) as count'))
            ->groupBy('status')
            ->pluck('count', 'status')
            ->toArray();

        return [
            'total' => array_sum($counts),
            'unassigned' => $counts[WorkOrder::STATUS_UNASSIGNED] ?? 0,
            'pending' => $counts[WorkOrder::STATUS_PENDING] ?? 0,
            'waiting' => $counts[WorkOrder::STATUS_WAITING] ?? 0,
            'in_progress' => $counts[WorkOrder::STATUS_IN_PROGRESS] ?? 0,
            'completed' => $counts[WorkOrder::STATUS_COMPLETED] ?? 0,
            'shipped' => $counts[WorkOrder::STATUS_SHIPPED] ?? 0,
        ];
    }

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

        $workOrder = WorkOrder::where('tenant_id', $tenantId)
            ->with([
                'assignee:id,name',
                'team:id,name',
                'salesOrder:id,order_no,project_name',
                'items',
                'bendingDetail',
                'issues' => fn ($q) => $q->orderByDesc('created_at'),
            ])
            ->find($id);

        if (! $workOrder) {
            throw new NotFoundHttpException(__('error.not_found'));
        }

        return $workOrder;
    }

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

        return DB::transaction(function () use ($data, $tenantId, $userId) {
            // 작업지시번호 자동 생성
            $data['work_order_no'] = $this->generateWorkOrderNo($tenantId);
            $data['tenant_id'] = $tenantId;
            $data['created_by'] = $userId;
            $data['updated_by'] = $userId;

            // 담당자가 있으면 상태를 pending으로
            if (! empty($data['assignee_id'])) {
                $data['status'] = $data['status'] ?? WorkOrder::STATUS_PENDING;
            }

            $items = $data['items'] ?? [];
            $bendingDetail = $data['bending_detail'] ?? null;
            unset($data['items'], $data['bending_detail']);

            $workOrder = WorkOrder::create($data);

            // 품목 저장
            foreach ($items as $index => $item) {
                $item['sort_order'] = $index;
                $workOrder->items()->create($item);
            }

            // 벤딩 상세 저장 (벤딩 공정인 경우)
            if ($data['process_type'] === WorkOrder::PROCESS_BENDING && $bendingDetail) {
                $workOrder->bendingDetail()->create($bendingDetail);
            }

            return $workOrder->load(['assignee:id,name', 'team:id,name', 'items', 'bendingDetail']);
        });
    }

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

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

        return DB::transaction(function () use ($workOrder, $data, $userId) {
            $data['updated_by'] = $userId;

            $items = $data['items'] ?? null;
            $bendingDetail = $data['bending_detail'] ?? null;
            unset($data['items'], $data['bending_detail'], $data['work_order_no']); // 번호 변경 불가

            $workOrder->update($data);

            // 품목 교체 (있는 경우)
            if ($items !== null) {
                $workOrder->items()->delete();
                foreach ($items as $index => $item) {
                    $item['sort_order'] = $index;
                    $workOrder->items()->create($item);
                }
            }

            // 벤딩 상세 업데이트
            if ($bendingDetail !== null && $workOrder->process_type === WorkOrder::PROCESS_BENDING) {
                $workOrder->bendingDetail()->updateOrCreate(
                    ['work_order_id' => $workOrder->id],
                    $bendingDetail
                );
            }

            return $workOrder->load(['assignee:id,name', 'team:id,name', 'items', 'bendingDetail']);
        });
    }

    /**
     * 삭제
     */
    public function destroy(int $id)
    {
        $tenantId = $this->tenantId();

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

        // 진행 중이거나 완료된 작업은 삭제 불가
        if (in_array($workOrder->status, [
            WorkOrder::STATUS_IN_PROGRESS,
            WorkOrder::STATUS_COMPLETED,
            WorkOrder::STATUS_SHIPPED,
        ])) {
            throw new BadRequestHttpException(__('error.work_order.cannot_delete_in_progress'));
        }

        $workOrder->delete();

        return 'success';
    }

    /**
     * 상태 변경
     */
    public function updateStatus(int $id, string $status)
    {
        $tenantId = $this->tenantId();
        $userId = $this->apiUserId();

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

        // 상태 유효성 검증
        if (! in_array($status, WorkOrder::STATUSES)) {
            throw new BadRequestHttpException(__('error.invalid_status'));
        }

        $workOrder->status = $status;
        $workOrder->updated_by = $userId;

        // 상태에 따른 타임스탬프 업데이트
        switch ($status) {
            case WorkOrder::STATUS_IN_PROGRESS:
                $workOrder->started_at = $workOrder->started_at ?? now();
                break;
            case WorkOrder::STATUS_COMPLETED:
                $workOrder->completed_at = now();
                break;
            case WorkOrder::STATUS_SHIPPED:
                $workOrder->shipped_at = now();
                break;
        }

        $workOrder->save();

        return $workOrder->load(['assignee:id,name', 'team:id,name']);
    }

    /**
     * 담당자 배정
     */
    public function assign(int $id, array $data)
    {
        $tenantId = $this->tenantId();
        $userId = $this->apiUserId();

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

        $workOrder->assignee_id = $data['assignee_id'];
        $workOrder->team_id = $data['team_id'] ?? $workOrder->team_id;
        $workOrder->updated_by = $userId;

        // 미배정이었으면 대기로 변경
        if ($workOrder->status === WorkOrder::STATUS_UNASSIGNED) {
            $workOrder->status = WorkOrder::STATUS_PENDING;
        }

        $workOrder->save();

        return $workOrder->load(['assignee:id,name', 'team:id,name']);
    }

    /**
     * 벤딩 항목 토글
     */
    public function toggleBendingField(int $id, string $field)
    {
        $tenantId = $this->tenantId();

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

        if ($workOrder->process_type !== WorkOrder::PROCESS_BENDING) {
            throw new BadRequestHttpException(__('error.work_order.not_bending_process'));
        }

        $detail = $workOrder->bendingDetail;
        if (! $detail) {
            $detail = $workOrder->bendingDetail()->create([]);
        }

        if (! in_array($field, WorkOrderBendingDetail::PROCESS_FIELDS)) {
            throw new BadRequestHttpException(__('error.invalid_field'));
        }

        $detail->toggleField($field);

        return $detail;
    }

    /**
     * 이슈 추가
     */
    public function addIssue(int $workOrderId, array $data)
    {
        $tenantId = $this->tenantId();
        $userId = $this->apiUserId();

        $workOrder = WorkOrder::where('tenant_id', $tenantId)->find($workOrderId);
        if (! $workOrder) {
            throw new NotFoundHttpException(__('error.not_found'));
        }

        $data['reported_by'] = $userId;

        return $workOrder->issues()->create($data);
    }

    /**
     * 이슈 해결
     */
    public function resolveIssue(int $workOrderId, int $issueId)
    {
        $tenantId = $this->tenantId();
        $userId = $this->apiUserId();

        $workOrder = WorkOrder::where('tenant_id', $tenantId)->find($workOrderId);
        if (! $workOrder) {
            throw new NotFoundHttpException(__('error.not_found'));
        }

        $issue = $workOrder->issues()->find($issueId);
        if (! $issue) {
            throw new NotFoundHttpException(__('error.not_found'));
        }

        $issue->resolve($userId);

        return $issue;
    }

    /**
     * 작업지시번호 자동 생성
     */
    private function generateWorkOrderNo(int $tenantId): string
    {
        $prefix = 'WO';
        $date = now()->format('Ymd');

        // 오늘 날짜 기준 마지막 번호 조회
        $lastNo = WorkOrder::withoutGlobalScopes()
            ->where('tenant_id', $tenantId)
            ->where('work_order_no', 'like', "{$prefix}{$date}%")
            ->orderByDesc('work_order_no')
            ->value('work_order_no');

        if ($lastNo) {
            $seq = (int) substr($lastNo, -4) + 1;
        } else {
            $seq = 1;
        }

        return sprintf('%s%s%04d', $prefix, $date, $seq);
    }
}