<?php

namespace App\Module\Farm\Logics;

use App\Module\Farm\Dtos\DisasterInfoDto;
use App\Module\Farm\Enums\DISASTER_TYPE;
use App\Module\Farm\Enums\GROWTH_STAGE;
use App\Module\Farm\Enums\LAND_STATUS;
use App\Module\Farm\Events\DisasterGeneratedEvent;
use App\Module\Farm\Models\FarmCrop;
use App\Module\Farm\Models\FarmGodBuff;
use App\Module\Farm\Models\FarmLand;
use App\Module\Farm\Models\FarmCropLog;
use App\Module\Farm\Services\DisasterService;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;

/**
 * 灾害管理逻辑
 */
class DisasterLogic
{

    /**
     * 获取作物的灾害信息
     *
     * @param int $cropId
     * @return Collection
     */
    public function getCropDisasters(int $cropId): Collection
    {
        try {
            $crop = FarmCrop::find($cropId);

            if (!$crop || empty($crop->disasters)) {
                return collect();
            }

            $disasters = collect($crop->disasters);

            return $disasters->map(function ($disaster) {
                return DisasterInfoDto::fromArray($disaster);
            });
        } catch (\Exception $e) {
            Log::error('获取作物灾害信息失败', [
                'crop_id' => $cropId,
                'error'   => $e->getMessage(),
                'trace'   => $e->getTraceAsString()
            ]);

            return collect();
        }
    }

    /**
     * 获取作物的活跃灾害
     *
     * @param int $cropId
     * @return Collection
     */
    public function getActiveDisasters(int $cropId): Collection
    {
        try {
            $crop = FarmCrop::find($cropId);

            if (!$crop || empty($crop->disasters)) {
                return collect();
            }

            $disasters = collect($crop->disasters)->filter(function ($disaster) {
                return ($disaster['status'] ?? '') === 'active';
            });

            return $disasters->map(function ($disaster) {
                return DisasterInfoDto::fromArray($disaster);
            });
        } catch (\Exception $e) {
            Log::error('获取作物活跃灾害失败', [
                'crop_id' => $cropId,
                'error'   => $e->getMessage(),
                'trace'   => $e->getTraceAsString()
            ]);

            return collect();
        }
    }

    /**
     * 生成灾害
     *
     * @param int $cropId
     * @return DisasterInfoDto|null
     */
    public function generateDisaster(int $cropId): ?DisasterInfoDto
    {
        try {
            $crop = FarmCrop::find($cropId);

            if (!$crop) {
                throw new \Exception('作物不存在');
            }

            /**
             * @var FarmLand $land
             */
            $land = $crop->land;

            if (!$land) {
                throw new \Exception('土地不存在');
            }

            // 只在发芽期、生长期和果实期生成灾害
            if (!in_array($crop->growth_stage, [ GROWTH_STAGE::SPROUT, GROWTH_STAGE::GROWTH, GROWTH_STAGE::FRUIT ])) {
                return null;
            }

            // 注意：根据文档，作物灾害和土地无关，不需要检查土地状态

            $userId = $crop->user_id;
            $seed   = $crop->seed;

            // 获取种子的灾害抵抗属性
            $disasterResistance = $seed->disaster_resistance ?? [];

            // 获取土地的灾害抵抗属性（数据库存储百分比，需要除以100转换为小数）
            $landDisasterResistance = ($land->landType->disaster_resistance ?? 0) / 100;

            // 检查用户是否有有效的神灵加持
            $activeBuffs = FarmGodBuff::where('user_id', $userId)
                ->where('expire_time', '>', now())
                ->pluck('buff_type')
                ->toArray();

            // 尝试生成灾害（支持多种灾害）
            $disasterInfos = $this->tryGenerateDisasterForCrop($crop, $disasterResistance, $landDisasterResistance, $activeBuffs);

            if (!empty($disasterInfos)) {
                $disasterDtos = $this->applyDisastersToCrop($crop, $disasterInfos);

                Log::info('灾害生成成功', [
                    'user_id'       => $userId,
                    'crop_id'       => $crop->id,
                    'land_id'       => $land->id,
                    'disaster_count' => count($disasterInfos),
                    'disaster_types' => array_column($disasterInfos, 'type')
                ]);

                return $disasterDtos[0] ?? null; // 返回第一个灾害信息保持兼容性
            }

            return null;
        } catch (\Exception $e) {
            \UCore\Helper\Logger::exception('灾害生成失败', $e, [
                'crop_id' => $cropId,
            ]);

            return null;
        }
    }

    /**
     * 尝试为作物生成灾害（支持多种灾害同时发生）
     *
     * @param FarmCrop $crop
     * @param mixed $disasterResistance
     * @param float $landDisasterResistance
     * @param array $activeBuffs
     * @return array 生成的灾害信息数组
     */
    private function tryGenerateDisasterForCrop(FarmCrop $crop, $disasterResistance, float $landDisasterResistance, array $activeBuffs): array
    {
        // 灾害类型及其基础概率
        $disasterTypes = DisasterService::getRate();
        $generatedDisasters = [];

        // 对每种灾害类型都进行判定
        foreach ($disasterTypes as $disasterType => $baseProb) {
            // 计算最终概率，考虑种子抵抗、土地抵抗和神灵加持
            $seedResistance = 0;
            if ($disasterResistance) {
                if (is_object($disasterResistance) && method_exists($disasterResistance, 'getResistance')) {
                    // 如果是 DisasterResistanceCast 对象（数据库存储百分比，需要除以100转换为小数）
                    $seedResistance = $disasterResistance->getResistance($disasterType) / 100;
                } elseif (is_array($disasterResistance)) {
                    // 如果是数组格式（数据库存储百分比，需要除以100转换为小数）
                    $seedResistance = ($disasterResistance[DisasterService::getDisasterKey($disasterType)] ?? 0) / 100;
                }
            }

            $finalProb = $baseProb - $seedResistance - $landDisasterResistance;

            // 如果有对应的神灵加持，则不生成该类型的灾害
            $buffType = DISASTER_TYPE::getPreventBuffType($disasterType);
            $hasGodBuff = $buffType && in_array($buffType, $activeBuffs);
            if ($hasGodBuff) {
                $finalProb = 0;
            }

            // 确保概率在有效范围内
            $finalProb = max(0, min(1, $finalProb));

            // 生成随机数
            $randomNumber = mt_rand(1, 100);
            $threshold = $finalProb * 100;

            // 详细的debug日志
            Log::debug('灾害生成详细信息', [
                'crop_id' => $crop->id,
                'user_id' => $crop->user_id,
                'growth_stage' => $crop->growth_stage->valueInt(),
                'disaster_type' => $disasterType,
                'disaster_type_name' => DISASTER_TYPE::getName($disasterType),
                'base_probability' => $baseProb,
                'seed_resistance' => $seedResistance,
                'land_resistance' => $landDisasterResistance,
                'active_buffs' => $activeBuffs,
                'god_buff_type' => $buffType,
                'has_god_buff' => $hasGodBuff,
                'final_probability' => $finalProb,
                'threshold' => $threshold,
                'random_number' => $randomNumber,
                'will_generate' => $randomNumber <= $threshold,
                'disaster_resistance_type' => is_object($disasterResistance) ? get_class($disasterResistance) : gettype($disasterResistance),
                'disaster_resistance_raw' => is_object($disasterResistance) ? 'object' : $disasterResistance
            ]);

            // 随机决定是否生成该类型灾害
            if ($randomNumber <= $threshold) {
                $disasterInfo = [
                    'type' => $disasterType,
                    'generated_ts' => now()->toDateTimeString(),
                    'status' => 'active'
                ];

                $generatedDisasters[] = $disasterInfo;

                Log::debug('灾害生成成功', [
                    'crop_id' => $crop->id,
                    'disaster_type' => $disasterType,
                    'disaster_type_name' => DISASTER_TYPE::getName($disasterType),
                    'final_probability' => $finalProb
                ]);
            } else {
                Log::info('灾害未生成', [
                    'crop_id' => $crop->id,
                    'disaster_type' => $disasterType,
                    'disaster_type_name' => DISASTER_TYPE::getName($disasterType),
                    'reason' => '随机数超过阈值',
                    'random_number' => $randomNumber,
                    'threshold' => $threshold,
                    'final_probability' => $finalProb
                ]);
            }
        }

        return $generatedDisasters;
    }

    /**
     * 将多个灾害应用到作物上
     *
     * @param FarmCrop $crop
     * @param array $disasterInfos
     * @return array
     */
    private function applyDisastersToCrop(FarmCrop $crop, array $disasterInfos): array
    {
        if (empty($disasterInfos)) {
            return [];
        }

        // 更新作物灾害信息
        $disasters = $crop->disasters ?? [];
        $disasters = array_merge($disasters, $disasterInfos);
        $crop->disasters = $disasters;

        // TODO: 根据文档，作物灾害和土地无关，此处更新土地状态可能需要重新评估
        // 更新土地状态为灾害
        $land = $crop->land;
        $oldLandStatus = $land->status;
        $land->status = LAND_STATUS::DISASTER->value;

        // 保存更改
        $crop->save();
        $land->save();

        // 如果土地状态发生了变化，触发土地状态变更事件
        if ($oldLandStatus !== $land->status) {
            event(new \App\Module\Farm\Events\LandStatusChangedEvent($crop->user_id, $land->id, $oldLandStatus, $land->status));
        }

        // 触发灾害生成事件
        $disasterDtos = [];
        foreach ($disasterInfos as $disasterInfo) {
            event(new DisasterGeneratedEvent($crop->user_id, $crop, $disasterInfo['type'], $disasterInfo));
            $disasterDtos[] = DisasterInfoDto::fromArray($disasterInfo);

            // 记录灾害产生事件
            FarmCropLog::logDisasterOccurred($crop->user_id, $crop->land_id, $crop->id, $crop->seed_id, [
                'disaster_type' => $disasterInfo['type'],
                'disaster_info' => $disasterInfo,
                'growth_stage' => $crop->growth_stage->value,
                'land_type' => $land->land_type ?? 1,
                'old_land_status' => $oldLandStatus,
                'new_land_status' => $land->status,
                'generated_at' => $disasterInfo['generated_ts']
            ]);
        }

        return $disasterDtos;
    }

    /**
     * 批量获取需要检查灾害的作物并处理
     *
     * @param int|null $checkIntervalMinutes 检查间隔（分钟）
     * @return array 生成结果统计
     */
    public function generateDisasterBatchs(?int $checkIntervalMinutes = null): array
    {
        if ($checkIntervalMinutes === null) {
            $checkIntervalMinutes = DisasterService::getCheckInterval();
        }

        $checkTime = now()->subMinutes($checkIntervalMinutes);

        // 获取需要检查灾害的作物：
        // 1. 必须在发芽期、生长期或果实期
        // 2. 当前阶段可以产生灾害 (can_disaster = 1)
        // 3. 满足时间检查条件（首次检查或超过检查间隔）
        $crops = FarmCrop::whereIn('growth_stage', [GROWTH_STAGE::SPROUT, GROWTH_STAGE::GROWTH, GROWTH_STAGE::FRUIT])
            ->where('can_disaster', true)
            ->where(function ($query) use ($checkTime) {
                $query->whereNull('last_disaster_check_time')
                      ->orWhere('last_disaster_check_time', '<', $checkTime);
            })
            ->with(['land.landType', 'seed', 'user.buffs' => function ($query) {
                $query->where('expire_time', '>', now());
            }])
            ->get();

        $totalCount = $crops->count();
        $generatedCount = 0;
        $skippedCount = 0;

        foreach ($crops as $crop) {
            $result = $this->generateDisasters($crop);

            if ($result === 'generated') {
                $generatedCount++;
            } elseif ($result === 'skipped') {
                $skippedCount++;
            }
        }

        return [
            'total' => $totalCount,
            'generated' => $generatedCount,
            'skipped' => $skippedCount
        ];
    }

    /**
     * 为单个作物生成灾害
     *
     * @param FarmCrop $crop
     * @return string 处理结果：'generated', 'skipped', 'failed'
     */
    public function generateDisasters(FarmCrop $crop): string
    {
        try {
            // 1. 先进行基础检查和计算（不在事务中，减少锁时间）

            // 检查用户是否存在
            if (!$crop->user) {
                Log::warning('作物关联的用户不存在，跳过灾害生成', [
                    'crop_id' => $crop->id,
                    'user_id' => $crop->user_id
                ]);
                return 'skipped';
            }

            // 注意：根据文档，作物灾害和土地无关，不需要检查土地状态

            // 获取相关数据并计算灾害
            $disasterResistance = $crop->seed->disaster_resistance ?? null;
            $landDisasterResistance = ($crop->land->landType->disaster_resistance ?? 0) / 100;
            $activeBuffs = $crop->user->buffs->pluck('buff_type')->toArray();

            // 尝试生成灾害（支持多种灾害）
            $disasterInfos = $this->tryGenerateDisasterForCrop($crop, $disasterResistance, $landDisasterResistance, $activeBuffs);

            // 2. 开启事务进行有锁更新
            return DB::transaction(function () use ($crop, $disasterInfos) {
                // 使用行锁重新获取作物，确保数据一致性
                $lockedCrop = FarmCrop::where('id', $crop->id)
                    ->lockForUpdate()
                    ->first();

                // 如果作物不存在或已被软删除，跳过处理
                if (!$lockedCrop || $lockedCrop->trashed()) {
                    Log::info('作物已被删除，跳过灾害生成', [
                        'crop_id' => $crop->id,
                        'user_id' => $crop->user_id
                    ]);
                    return 'skipped';
                }

                // 更新检查时间
                $lockedCrop->last_disaster_check_time = now();

                // 如果有灾害需要生成，应用到作物
                if (!empty($disasterInfos)) {
                    // 应用灾害到作物
                    $this->applyDisastersToCrop($lockedCrop, $disasterInfos);

                    // 生成灾害后，设置当前阶段不能再产生灾害
                    $lockedCrop->can_disaster = false;
                    $lockedCrop->save();

                    Log::info('单个作物灾害生成成功', [
                        'crop_id' => $lockedCrop->id,
                        'user_id' => $lockedCrop->user_id,
                        'disaster_count' => count($disasterInfos),
                        'disaster_types' => array_column($disasterInfos, 'type')
                    ]);

                    return 'generated';
                } else {
                    // 没有生成灾害，但需要保存检查时间
                    $lockedCrop->save();
                    return 'checked';
                }
            });

        } catch (\Exception $e) {
            Log::error('单个作物灾害生成失败', [
                'crop_id' => $crop->id,
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString()
            ]);

            return 'failed';
        }
    }

    /**
     * 批量检查并生成灾害（兼容性方法）
     *
     * @param int|null $checkIntervalMinutes 检查间隔（分钟）
     * @return array 生成结果统计
     */
    public function batchGenerateDisasters(?int $checkIntervalMinutes = null): array
    {
        return $this->generateDisasterBatchs($checkIntervalMinutes);
    }

}