<?php

namespace App\Services;

use App\Models\Tenants\Plan;
use Illuminate\Contracts\Pagination\LengthAwarePaginator;
use Illuminate\Database\Eloquent\Collection;

class PlanService extends Service
{
    // =========================================================================
    // 요금제 목록/상세
    // =========================================================================

    /**
     * 요금제 목록 (관리자용)
     */
    public function index(array $params): LengthAwarePaginator
    {
        $query = Plan::query();

        // 활성 상태 필터
        if (isset($params['is_active'])) {
            $query->where('is_active', (bool) $params['is_active']);
        }

        // 결제 주기 필터
        if (! empty($params['billing_cycle'])) {
            $query->ofCycle($params['billing_cycle']);
        }

        // 검색 (이름, 코드, 설명)
        if (! empty($params['search'])) {
            $search = $params['search'];
            $query->where(function ($q) use ($search) {
                $q->where('name', 'like', "%{$search}%")
                    ->orWhere('code', 'like', "%{$search}%")
                    ->orWhere('description', 'like', "%{$search}%");
            });
        }

        // 정렬
        $sortBy = $params['sort_by'] ?? 'price';
        $sortDir = $params['sort_dir'] ?? 'asc';
        $query->orderBy($sortBy, $sortDir);

        $perPage = $params['per_page'] ?? 20;

        return $query->paginate($perPage);
    }

    /**
     * 활성 요금제 목록 (공개용)
     */
    public function active(): Collection
    {
        return Plan::active()
            ->orderBy('price', 'asc')
            ->get();
    }

    /**
     * 요금제 상세
     */
    public function show(int $id): Plan
    {
        return Plan::query()
            ->withCount(['subscriptions as active_subscriptions_count' => function ($q) {
                $q->where('status', 'active');
            }])
            ->findOrFail($id);
    }

    // =========================================================================
    // 요금제 생성/수정/삭제
    // =========================================================================

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

        return Plan::create([
            'name' => $data['name'],
            'code' => $data['code'],
            'description' => $data['description'] ?? null,
            'price' => $data['price'],
            'billing_cycle' => $data['billing_cycle'] ?? Plan::BILLING_MONTHLY,
            'features' => $data['features'] ?? null,
            'is_active' => $data['is_active'] ?? true,
            'created_by' => $userId,
            'updated_by' => $userId,
        ]);
    }

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

        $plan = Plan::findOrFail($id);

        $plan->fill([
            'name' => $data['name'] ?? $plan->name,
            'code' => $data['code'] ?? $plan->code,
            'description' => $data['description'] ?? $plan->description,
            'price' => $data['price'] ?? $plan->price,
            'billing_cycle' => $data['billing_cycle'] ?? $plan->billing_cycle,
            'features' => $data['features'] ?? $plan->features,
            'is_active' => $data['is_active'] ?? $plan->is_active,
            'updated_by' => $userId,
        ]);

        $plan->save();

        return $plan->fresh();
    }

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

        $plan = Plan::findOrFail($id);

        // 활성 구독이 있으면 삭제 불가
        $activeCount = $plan->subscriptions()
            ->whereIn('status', ['active', 'pending'])
            ->count();

        if ($activeCount > 0) {
            throw new \Symfony\Component\HttpKernel\Exception\BadRequestHttpException(
                __('error.plan.has_active_subscriptions')
            );
        }

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

        return true;
    }

    /**
     * 요금제 활성/비활성 토글
     */
    public function toggle(int $id): Plan
    {
        $userId = $this->apiUserId();

        $plan = Plan::findOrFail($id);
        $plan->is_active = ! $plan->is_active;
        $plan->updated_by = $userId;
        $plan->save();

        return $plan;
    }
}