<?php

namespace App\Module\ThirdParty\Services;

use App\Module\ThirdParty\Models\ThirdPartyQuota;
use App\Module\ThirdParty\Models\ThirdPartyService;
use App\Module\ThirdParty\Enums\QUOTA_TYPE;
use Illuminate\Support\Collection;

/**
 * 第三方服务配额管理服务类
 */
class QuotaService
{
    /**
     * 创建配额
     *
     * @param array $data
     * @return ThirdPartyQuota
     * @throws \Exception
     */
    public static function create(array $data): ThirdPartyQuota
    {
        // 验证服务是否存在
        $service = ThirdPartyService::find($data['service_id']);
        if (!$service) {
            throw new \Exception("服务不存在: {$data['service_id']}");
        }

        // 验证配额类型
        if (!QUOTA_TYPE::tryFrom($data['type'])) {
            throw new \Exception("无效的配额类型: {$data['type']}");
        }

        // 检查是否已存在相同类型的配额
        $existing = ThirdPartyQuota::where('service_id', $data['service_id'])
            ->where('type', $data['type'])
            ->first();

        if ($existing) {
            throw new \Exception("服务已存在 {$data['type']} 类型的配额");
        }

        return ThirdPartyQuota::createQuota($data);
    }

    /**
     * 更新配额
     *
     * @param int $quotaId
     * @param array $data
     * @return bool
     * @throws \Exception
     */
    public static function update(int $quotaId, array $data): bool
    {
        $quota = ThirdPartyQuota::findOrFail($quotaId);

        // 如果更新配额类型，验证唯一性
        if (isset($data['type']) && $data['type'] !== $quota->type) {
            if (!QUOTA_TYPE::tryFrom($data['type'])) {
                throw new \Exception("无效的配额类型: {$data['type']}");
            }

            $existing = ThirdPartyQuota::where('service_id', $quota->service_id)
                ->where('type', $data['type'])
                ->where('id', '!=', $quotaId)
                ->first();

            if ($existing) {
                throw new \Exception("服务已存在 {$data['type']} 类型的配额");
            }
        }

        return $quota->update($data);
    }

    /**
     * 删除配额
     *
     * @param int $quotaId
     * @return bool
     */
    public static function delete(int $quotaId): bool
    {
        $quota = ThirdPartyQuota::findOrFail($quotaId);
        return $quota->delete();
    }

    /**
     * 获取配额详情
     *
     * @param int $quotaId
     * @return ThirdPartyQuota
     */
    public static function getById(int $quotaId): ThirdPartyQuota
    {
        return ThirdPartyQuota::with('service')->findOrFail($quotaId);
    }

    /**
     * 获取配额列表
     *
     * @param array $filters
     * @param array $options
     * @return Collection
     */
    public static function getList(array $filters = [], array $options = []): Collection
    {
        $query = ThirdPartyQuota::with('service');

        // 应用过滤条件
        if (isset($filters['service_id'])) {
            $query->where('service_id', $filters['service_id']);
        }

        if (isset($filters['type'])) {
            $query->where('type', $filters['type']);
        }

        if (isset($filters['is_active'])) {
            $query->where('is_active', $filters['is_active']);
        }

        if (isset($filters['is_exceeded'])) {
            $query->where('is_exceeded', $filters['is_exceeded']);
        }

        if (isset($filters['near_threshold'])) {
            if ($filters['near_threshold']) {
                $query->nearThreshold();
            }
        }

        // 应用排序
        $sortBy = $options['sort_by'] ?? 'created_at';
        $sortOrder = $options['sort_order'] ?? 'desc';
        $query->orderBy($sortBy, $sortOrder);

        return $query->get();
    }

    /**
     * 检查配额是否可用
     *
     * @param int $serviceId
     * @param int $amount
     * @return bool
     */
    public static function canUse(int $serviceId, int $amount = 1): bool
    {
        $quotas = ThirdPartyQuota::where('service_id', $serviceId)
            ->where('is_active', true)
            ->get();

        foreach ($quotas as $quota) {
            if (!$quota->canUse($amount)) {
                return false;
            }
        }

        return true;
    }

    /**
     * 使用配额
     *
     * @param int $serviceId
     * @param int $amount
     * @return bool
     */
    public static function use(int $serviceId, int $amount = 1): bool
    {
        $quotas = ThirdPartyQuota::where('service_id', $serviceId)
            ->where('is_active', true)
            ->get();

        foreach ($quotas as $quota) {
            $quota->incrementUsage($amount);
        }

        return true;
    }

    /**
     * 重置配额
     *
     * @param int $quotaId
     * @return bool
     */
    public static function reset(int $quotaId): bool
    {
        $quota = ThirdPartyQuota::findOrFail($quotaId);
        return $quota->resetQuota();
    }

    /**
     * 批量重置配额
     *
     * @param array $quotaIds
     * @return array
     */
    public static function batchReset(array $quotaIds): array
    {
        $results = [
            'success' => [],
            'failed' => [],
        ];

        foreach ($quotaIds as $quotaId) {
            try {
                static::reset($quotaId);
                $results['success'][] = $quotaId;
            } catch (\Exception $e) {
                $results['failed'][] = [
                    'id' => $quotaId,
                    'error' => $e->getMessage(),
                ];
            }
        }

        return $results;
    }

    /**
     * 获取需要重置的配额
     *
     * @return Collection
     */
    public static function getQuotasNeedingReset(): Collection
    {
        return ThirdPartyQuota::where('is_active', true)
            ->get()
            ->filter(function ($quota) {
                return $quota->needsReset();
            });
    }

    /**
     * 自动重置配额
     *
     * @return int 重置数量
     */
    public static function autoReset(): int
    {
        $quotas = static::getQuotasNeedingReset();
        $resetCount = 0;

        foreach ($quotas as $quota) {
            try {
                $quota->resetQuota();
                $resetCount++;
            } catch (\Exception $e) {
                \Log::warning("自动重置配额失败: {$quota->id}, 错误: {$e->getMessage()}");
            }
        }

        return $resetCount;
    }

    /**
     * 获取超限的配额
     *
     * @return Collection
     */
    public static function getExceededQuotas(): Collection
    {
        return ThirdPartyQuota::with('service')
            ->where('is_active', true)
            ->where('is_exceeded', true)
            ->get();
    }

    /**
     * 获取接近阈值的配额
     *
     * @return Collection
     */
    public static function getNearThresholdQuotas(): Collection
    {
        return ThirdPartyQuota::with('service')
            ->where('is_active', true)
            ->nearThreshold()
            ->get();
    }

    /**
     * 获取配额统计信息
     *
     * @param int|null $serviceId
     * @return array
     */
    public static function getStats(?int $serviceId = null): array
    {
        $query = ThirdPartyQuota::query();

        if ($serviceId) {
            $query->where('service_id', $serviceId);
        }

        $total = $query->count();
        $active = $query->where('is_active', true)->count();
        $exceeded = $query->where('is_exceeded', true)->count();
        $nearThreshold = $query->nearThreshold()->count();

        // 按类型统计
        $typeStats = $query->selectRaw('type, COUNT(*) as count')
            ->groupBy('type')
            ->pluck('count', 'type')
            ->toArray();

        // 使用率统计
        $usageStats = $query->where('is_active', true)
            ->get()
            ->map(function ($quota) {
                return [
                    'service_name' => $quota->service->name,
                    'type' => $quota->type,
                    'usage_percentage' => $quota->getUsagePercentage(),
                    'status' => $quota->getStatus(),
                ];
            })
            ->toArray();

        return [
            'total' => $total,
            'active' => $active,
            'exceeded' => $exceeded,
            'near_threshold' => $nearThreshold,
            'by_type' => $typeStats,
            'usage_stats' => $usageStats,
            'health_rate' => $total > 0 ? round((($active - $exceeded) / $total) * 100, 2) : 0,
        ];
    }

    /**
     * 创建默认配额
     *
     * @param int $serviceId
     * @return array
     */
    public static function createDefaultQuotas(int $serviceId): array
    {
        $service = ThirdPartyService::findOrFail($serviceId);
        $defaultLimits = config('thirdparty.quota.default_limits', []);
        $created = [];

        foreach ($defaultLimits as $type => $limit) {
            try {
                $quota = static::create([
                    'service_id' => $serviceId,
                    'type' => $type,
                    'limit_value' => $limit,
                    'is_active' => true,
                ]);
                $created[] = $quota;
            } catch (\Exception $e) {
                // 如果配额已存在，跳过
                if (!str_contains($e->getMessage(), '已存在')) {
                    throw $e;
                }
            }
        }

        return $created;
    }

    /**
     * 导出配额配置
     *
     * @param array $quotaIds
     * @return array
     */
    public static function export(array $quotaIds = []): array
    {
        $query = ThirdPartyQuota::with('service');
        
        if (!empty($quotaIds)) {
            $query->whereIn('id', $quotaIds);
        }

        $quotas = $query->get();
        $exported = [];

        foreach ($quotas as $quota) {
            $exported[] = [
                'id' => $quota->id,
                'service_name' => $quota->service->name,
                'service_code' => $quota->service->code,
                'type' => $quota->type,
                'type_label' => $quota->getTypeLabel(),
                'limit_value' => $quota->limit_value,
                'used_value' => $quota->used_value,
                'usage_percentage' => $quota->getUsagePercentage(),
                'is_active' => $quota->is_active,
                'alert_threshold' => $quota->alert_threshold,
                'is_exceeded' => $quota->is_exceeded,
                'status' => $quota->getStatusLabel(),
                'created_at' => $quota->created_at->toDateTimeString(),
            ];
        }

        return $exported;
    }
}