<?php

namespace App\Module\Mex\Logic;

use App\Module\Mex\Models\MexAdminOperation;
use App\Module\Mex\Models\MexWarehouse;
use App\Module\Mex\Models\MexTransaction;
use App\Module\Mex\Models\MexPriceConfig;
use App\Module\Mex\Enums\AdminOperationType;
use App\Module\Mex\Enums\TransactionType;
use App\Module\GameItems\Services\ItemService;
use App\Module\Game\Enums\REWARD_SOURCE_TYPE;
use Illuminate\Support\Facades\DB;

/**
 * 农贸市场管理员操作逻辑
 * 
 * 处理管理员操作相关的核心业务逻辑
 */
class MexAdminLogic
{
    /**
     * 仓库账户ID
     */
    private const WAREHOUSE_USER_ID = 15;
    
    /**
     * 调控账户ID
     */
    private const CONTROL_USER_ID = 16;

    /**
     * 物品注入（增加市场供应）
     * 
     * @param int $adminUserId 管理员用户ID
     * @param int $itemId 商品ID
     * @param int $quantity 数量
     * @param string $price 价格
     * @param string|null $remark 备注
     * @return array 操作结果
     */
    public static function injectItem(int $adminUserId, int $itemId, int $quantity, string $price, ?string $remark = null): array
    {
        if ($quantity <= 0) {
            return ['success' => false, 'message' => '注入数量必须大于0'];
        }

        if (bccomp($price, '0', 5) <= 0) {
            return ['success' => false, 'message' => '注入价格必须大于0'];
        }

        $totalAmount = bcmul($price, $quantity, 5);

        try {
            return DB::transaction(function () use ($adminUserId, $itemId, $quantity, $price, $totalAmount, $remark) {
                // 获取操作前的仓库数量
                $warehouse = MexWarehouse::firstOrCreate(
                    ['item_id' => $itemId],
                    [
                        'quantity' => 0,
                        'total_buy_amount' => '0.00000',
                        'total_sell_amount' => '0.00000',
                        'total_buy_quantity' => 0,
                        'total_sell_quantity' => 0,
                    ]
                );

                $beforeQuantity = $warehouse->quantity;

                // 1. 给仓库账户添加真实物品（确保用户可以买到）
                $addItemResult = ItemService::addItem(self::WAREHOUSE_USER_ID, $itemId, $quantity, [
                    'reason' => 'mex_admin_inject',
                    'source_type' => REWARD_SOURCE_TYPE::ADMIN_GRANT->value,
                    'source_id' => $adminUserId,
                    'remark' => "管理员注入物品到农贸市场，管理员ID：{$adminUserId}"
                ]);

                if (!$addItemResult['success']) {
                    throw new \Exception('给仓库账户添加物品失败：' . ($addItemResult['message'] ?? '未知错误'));
                }

                // 2. 更新仓库库存统计（注入操作相当于系统买入）
                $warehouse->quantity += $quantity;
                $warehouse->total_buy_quantity += $quantity;
                $warehouse->total_buy_amount = bcadd($warehouse->total_buy_amount, $totalAmount, 5);
                $warehouse->last_transaction_at = now();
                $warehouse->save();

                $afterQuantity = $warehouse->quantity;

                // 创建成交记录
                $transaction = MexTransaction::create([
                    'buy_order_id' => null,
                    'sell_order_id' => null,
                    'buyer_id' => self::WAREHOUSE_USER_ID, // 仓库账户作为买方
                    'seller_id' => self::CONTROL_USER_ID, // 调控账户作为卖方
                    'item_id' => $itemId,
                    'quantity' => $quantity,
                    'price' => $price,
                    'total_amount' => $totalAmount,
                    'transaction_type' => TransactionType::ADMIN_INJECT,
                    'is_admin_operation' => true,
                    'admin_user_id' => $adminUserId,
                ]);

                // 创建管理员操作记录
                $operation = MexAdminOperation::create([
                    'admin_user_id' => $adminUserId,
                    'operation_type' => AdminOperationType::INJECT,
                    'item_id' => $itemId,
                    'quantity' => $quantity,
                    'price' => $price,
                    'total_amount' => $totalAmount,
                    'before_warehouse_quantity' => $beforeQuantity,
                    'after_warehouse_quantity' => $afterQuantity,
                    'transaction_id' => $transaction->id,
                    'remark' => $remark,
                ]);

                return [
                    'success' => true,
                    'message' => '物品注入成功',
                    'operation_id' => $operation->id,
                    'transaction_id' => $transaction->id,
                    'before_quantity' => $beforeQuantity,
                    'after_quantity' => $afterQuantity,
                    'injected_quantity' => $quantity,
                ];
            });
        } catch (\Exception $e) {
            return ['success' => false, 'message' => '物品注入失败：' . $e->getMessage()];
        }
    }

    /**
     * 物品回收（减少市场库存）
     * 
     * @param int $adminUserId 管理员用户ID
     * @param int $itemId 商品ID
     * @param int $quantity 数量
     * @param string $price 价格
     * @param string|null $remark 备注
     * @return array 操作结果
     */
    public static function recycleItem(int $adminUserId, int $itemId, int $quantity, string $price, ?string $remark = null): array
    {
        if ($quantity <= 0) {
            return ['success' => false, 'message' => '回收数量必须大于0'];
        }

        if (bccomp($price, '0', 5) <= 0) {
            return ['success' => false, 'message' => '回收价格必须大于0'];
        }

        $totalAmount = bcmul($price, $quantity, 5);

        try {
            return DB::transaction(function () use ($adminUserId, $itemId, $quantity, $price, $totalAmount, $remark) {
                // 检查仓库库存
                $warehouse = MexWarehouse::where('item_id', $itemId)->first();
                
                if (!$warehouse || $warehouse->quantity < $quantity) {
                    throw new \Exception('仓库库存不足，无法回收');
                }

                $beforeQuantity = $warehouse->quantity;

                // 1. 从仓库账户扣除真实物品
                $consumeItemResult = ItemService::consumeItem(self::WAREHOUSE_USER_ID, $itemId, null, $quantity, [
                    'reason' => 'mex_admin_recycle',
                    'source_id' => $adminUserId,
                    'remark' => "管理员从农贸市场回收物品，管理员ID：{$adminUserId}"
                ]);

                if (!$consumeItemResult['success']) {
                    throw new \Exception('从仓库账户扣除物品失败：' . ($consumeItemResult['message'] ?? '未知错误'));
                }

                // 2. 更新仓库库存统计（回收操作相当于系统卖出）
                $warehouse->quantity -= $quantity;
                $warehouse->total_sell_quantity += $quantity;
                $warehouse->total_sell_amount = bcadd($warehouse->total_sell_amount, $totalAmount, 5);
                $warehouse->last_transaction_at = now();
                $warehouse->save();

                $afterQuantity = $warehouse->quantity;

                // 创建成交记录
                $transaction = MexTransaction::create([
                    'buy_order_id' => null,
                    'sell_order_id' => null,
                    'buyer_id' => self::CONTROL_USER_ID, // 调控账户作为买方
                    'seller_id' => self::WAREHOUSE_USER_ID, // 仓库账户作为卖方
                    'item_id' => $itemId,
                    'quantity' => $quantity,
                    'price' => $price,
                    'total_amount' => $totalAmount,
                    'transaction_type' => TransactionType::ADMIN_RECYCLE,
                    'is_admin_operation' => true,
                    'admin_user_id' => $adminUserId,
                ]);

                // 创建管理员操作记录
                $operation = MexAdminOperation::create([
                    'admin_user_id' => $adminUserId,
                    'operation_type' => AdminOperationType::RECYCLE,
                    'item_id' => $itemId,
                    'quantity' => $quantity,
                    'price' => $price,
                    'total_amount' => $totalAmount,
                    'before_warehouse_quantity' => $beforeQuantity,
                    'after_warehouse_quantity' => $afterQuantity,
                    'transaction_id' => $transaction->id,
                    'remark' => $remark,
                ]);

                return [
                    'success' => true,
                    'message' => '物品回收成功',
                    'operation_id' => $operation->id,
                    'transaction_id' => $transaction->id,
                    'before_quantity' => $beforeQuantity,
                    'after_quantity' => $afterQuantity,
                    'recycled_quantity' => $quantity,
                ];
            });
        } catch (\Exception $e) {
            return ['success' => false, 'message' => '物品回收失败：' . $e->getMessage()];
        }
    }

    /**
     * 获取管理员操作记录
     * 
     * @param int $page 页码
     * @param int $pageSize 每页数量
     * @param int|null $adminUserId 管理员用户ID筛选
     * @param AdminOperationType|null $operationType 操作类型筛选
     * @return array 操作记录列表
     */
    public static function getAdminOperations(int $page = 1, int $pageSize = 20, ?int $adminUserId = null, ?AdminOperationType $operationType = null): array
    {
        $query = MexAdminOperation::query()->orderBy('created_at', 'desc');

        if ($adminUserId) {
            $query->where('admin_user_id', $adminUserId);
        }

        if ($operationType) {
            $query->where('operation_type', $operationType);
        }

        $operations = $query->paginate($pageSize, ['*'], 'page', $page);

        $result = [];
        foreach ($operations->items() as $operation) {
            $result[] = [
                'id' => $operation->id,
                'admin_user_id' => $operation->admin_user_id,
                'operation_type' => $operation->operation_type->value,
                'operation_type_desc' => $operation->operation_type->getDescription(),
                'item_id' => $operation->item_id,
                'quantity' => $operation->quantity,
                'price' => $operation->price,
                'total_amount' => $operation->total_amount,
                'before_warehouse_quantity' => $operation->before_warehouse_quantity,
                'after_warehouse_quantity' => $operation->after_warehouse_quantity,
                'quantity_change' => $operation->after_warehouse_quantity - $operation->before_warehouse_quantity,
                'transaction_id' => $operation->transaction_id,
                'remark' => $operation->remark,
                'created_at' => $operation->created_at,
            ];
        }

        return [
            'operations' => $result,
            'total' => $operations->total(),
            'page' => $page,
            'page_size' => $pageSize,
        ];
    }

    /**
     * 获取管理员操作统计
     * 
     * @param int $days 统计天数
     * @return array 统计信息
     */
    public static function getAdminOperationStats(int $days = 7): array
    {
        $startDate = now()->subDays($days)->startOfDay();
        
        $stats = MexAdminOperation::where('created_at', '>=', $startDate)
            ->selectRaw('
                COUNT(*) as total_operations,
                COUNT(CASE WHEN operation_type = ? THEN 1 END) as inject_count,
                COUNT(CASE WHEN operation_type = ? THEN 1 END) as recycle_count,
                SUM(CASE WHEN operation_type = ? THEN quantity ELSE 0 END) as inject_quantity,
                SUM(CASE WHEN operation_type = ? THEN quantity ELSE 0 END) as recycle_quantity,
                SUM(CASE WHEN operation_type = ? THEN total_amount ELSE 0 END) as inject_amount,
                SUM(CASE WHEN operation_type = ? THEN total_amount ELSE 0 END) as recycle_amount,
                COUNT(DISTINCT admin_user_id) as active_admins,
                COUNT(DISTINCT item_id) as affected_items
            ', [
                AdminOperationType::INJECT->value,
                AdminOperationType::RECYCLE->value,
                AdminOperationType::INJECT->value,
                AdminOperationType::RECYCLE->value,
                AdminOperationType::INJECT->value,
                AdminOperationType::RECYCLE->value,
            ])
            ->first();

        return [
            'days' => $days,
            'total_operations' => $stats->total_operations ?? 0,
            'inject_count' => $stats->inject_count ?? 0,
            'recycle_count' => $stats->recycle_count ?? 0,
            'inject_quantity' => $stats->inject_quantity ?? 0,
            'recycle_quantity' => $stats->recycle_quantity ?? 0,
            'inject_amount' => $stats->inject_amount ?? '0.00000',
            'recycle_amount' => $stats->recycle_amount ?? '0.00000',
            'net_quantity' => ($stats->inject_quantity ?? 0) - ($stats->recycle_quantity ?? 0),
            'net_amount' => bcsub($stats->inject_amount ?? '0', $stats->recycle_amount ?? '0', 5),
            'active_admins' => $stats->active_admins ?? 0,
            'affected_items' => $stats->affected_items ?? 0,
            'start_date' => $startDate,
            'end_date' => now(),
        ];
    }

    /**
     * 初始化库存
     * 为所有已启用定价的商品创建库存记录（库存为0）
     *
     * @param int $adminUserId 管理员用户ID
     * @return array 初始化结果
     */
    public static function initializeWarehouse(int $adminUserId): array
    {
        try {
            return DB::transaction(function () use ($adminUserId) {
                // 1. 检查是否已有库存记录
                $existingWarehouseCount = MexWarehouse::count();
                if ($existingWarehouseCount > 0) {
                    return [
                        'success' => false,
                        'message' => '库存表不为空，无法初始化。当前已有 ' . $existingWarehouseCount . ' 条库存记录。'
                    ];
                }

                // 2. 获取所有已启用的定价配置
                $priceConfigs = MexPriceConfig::where('is_enabled', true)->get();
                if ($priceConfigs->isEmpty()) {
                    return [
                        'success' => false,
                        'message' => '没有找到已启用的定价配置，无法初始化库存。'
                    ];
                }

                $initializedItems = [];
                $now = now();

                // 3. 为每个已定价的商品创建库存记录
                foreach ($priceConfigs as $priceConfig) {
                    $warehouse = MexWarehouse::create([
                        'item_id' => $priceConfig->item_id,
                        'quantity' => 0,
                        'total_buy_amount' => '0.00000',
                        'total_sell_amount' => '0.00000',
                        'total_buy_quantity' => 0,
                        'total_sell_quantity' => 0,
                        'last_transaction_at' => $now,
                    ]);

                    $initializedItems[] = [
                        'item_id' => $priceConfig->item_id,
                        'min_price' => $priceConfig->min_price,
                        'max_price' => $priceConfig->max_price,
                        'warehouse_id' => $warehouse->id,
                    ];
                }

                // 4. 创建管理员操作记录
                $operation = MexAdminOperation::create([
                    'admin_user_id' => $adminUserId,
                    'operation_type' => AdminOperationType::INJECT, // 使用注入类型记录初始化操作
                    'item_id' => 0, // 特殊标记：0表示批量初始化
                    'quantity' => count($initializedItems),
                    'price' => '0.00000',
                    'total_amount' => '0.00000',
                    'before_warehouse_quantity' => 0,
                    'after_warehouse_quantity' => 0,
                    'transaction_id' => null,
                    'remark' => "初始化农贸市场库存，为 " . count($initializedItems) . " 个商品创建库存记录",
                ]);

                return [
                    'success' => true,
                    'message' => '库存初始化成功',
                    'operation_id' => $operation->id,
                    'initialized_count' => count($initializedItems),
                    'initialized_items' => $initializedItems,
                ];
            });
        } catch (\Exception $e) {
            return ['success' => false, 'message' => '库存初始化失败：' . $e->getMessage()];
        }
    }
}