<?php
// application/common/library/GiftTableManager.php

namespace app\common\library;

use think\Db;
use think\Exception;
use think\Log;

class GiftTableManager
{
    /**
     * 根据时间戳获取分表名
     * @param int $timestamp 时间戳
     * @return string 表名
     */
    public static function getTableName($timestamp = null)
    {
        $timestamp = $timestamp ?: time();
        $month = date('Ym', $timestamp);
        return 'fa_vs_give_gift_' . $month;
    }

    /**
     * 创建月份分表（纯PHP实现，不使用存储过程）
     * @param string $yearMonth 年月格式：202401
     * @return bool
     * @throws Exception
     */
    public static function createMonthTable($yearMonth)
    {
        if (!preg_match('/^\d{6}$/', $yearMonth)) {
            throw new Exception('年月格式错误');
        }

        $tableName = 'fa_vs_give_gift_' . $yearMonth;

        // 检查表是否已存在
        try {
            $checkSql = "SHOW TABLES LIKE '{$tableName}'";
            $exists = Db::query($checkSql);
            if ($exists) {
                return true;
            }
        } catch (\Exception $e) {
            // 表不存在，继续创建
        }

        // 创建分表SQL
        $sql = "
        CREATE TABLE IF NOT EXISTS `{$tableName}` (
          `id` bigint NOT NULL COMMENT '雪花ID',
          `user_id` int NOT NULL DEFAULT '0' COMMENT '用户id  送礼物的人',
          `gift_id` int NOT NULL DEFAULT '0' COMMENT '礼物id',
          `gift_type` tinyint(1) NOT NULL DEFAULT '1' COMMENT '礼物类型，1-正常礼物，2-盲盒开出来的，3-签约金币',
          `number` int unsigned NOT NULL DEFAULT '0' COMMENT '礼物数量',
          `gift_user` int NOT NULL DEFAULT '0' COMMENT '收礼物的人',
          `from_id` int NOT NULL DEFAULT '0' COMMENT '来源ID，（房间ID）',
          `pit_number` int NOT NULL DEFAULT '0' COMMENT '麦位编号（废弃）',
          `total_price` decimal(16,2) NOT NULL COMMENT '礼物总价值',
          `type` int NOT NULL DEFAULT '1' COMMENT '1金币购买 2送背包礼物',
          `from` int NOT NULL DEFAULT '1' COMMENT '1私聊送礼物 2语聊房送礼 3视频直播房送礼（暂时不用） 4动态打赏 6私密房间送礼',
          `remarks` varchar(255) NULL COMMENT '备注',
          `createtime` bigint NOT NULL COMMENT '创建时间（秒时间戳）',
          `updatetime` bigint DEFAULT NULL COMMENT '更新时间（秒时间戳）',
          PRIMARY KEY (`id`),
          KEY `idx_createtime` (`createtime`) USING BTREE,
          KEY `idx_user_id` (`user_id`) USING BTREE,
          KEY `idx_gift_user` (`gift_user`) USING BTREE,
          KEY `idx_from_id` (`from_id`) USING BTREE,
          KEY `idx_room_user_time` (`from_id`, `user_id`, `createtime`) USING BTREE,
          KEY `idx_room_receiver_time` (`from_id`, `gift_user`, `createtime`) USING BTREE,
          KEY `idx_user_time` (`user_id`, `createtime`) USING BTREE,
          KEY `idx_receiver_time` (`gift_user`, `createtime`) USING BTREE,
          KEY `idx_combined_search` (`from_id`, `user_id`, `gift_user`, `createtime`) USING BTREE
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='用户送礼表_{$yearMonth}'
        ";

        try {
            Db::execute($sql);

            // 计算时间范围
            $startTime = strtotime($yearMonth . '01 00:00:00');
            $endTime = strtotime(date('Y-m-01', strtotime('+1 month', $startTime)));

            // 记录分表信息
            $tableInfo = Db::name('vs_give_gift_tables')
                ->where('table_name', $tableName)
                ->find();

            if (!$tableInfo) {
                Db::name('vs_give_gift_tables')->insert([
                    'table_name'  => $tableName,
                    'start_time'  => $startTime,
                    'end_time'    => $endTime,
                    'create_time' => time()
                ]);
            }

            Log::info("创建分表成功: {$tableName}");
            return true;
        } catch (\Exception $e) {
            Log::error("创建分表失败 {$tableName}: " . $e->getMessage());
            throw new Exception('创建分表失败：' . $e->getMessage());
        }
    }

    /**
     * 批量创建分表
     * @param int $months 创建未来几个月
     * @return array 创建结果
     */
    public static function batchCreateTables($months = 12)
    {
        $results = [];

        for ($i = 0; $i < $months; $i++) {
            $yearMonth = date('Ym', strtotime("+{$i} month"));

            try {
                $result = self::createMonthTable($yearMonth);
                $results[$yearMonth] = [
                    'success' => $result,
                    'message' => $result ? '创建成功' : '创建失败'
                ];
            } catch (\Exception $e) {
                $results[$yearMonth] = [
                    'success' => false,
                    'message' => $e->getMessage()
                ];
            }
        }

        return $results;
    }

    /**
     * 获取所有分表
     * @return array
     */
    public static function getAllTables()
    {
        try {
            return Db::name('vs_give_gift_tables')
                ->order('start_time', 'asc')
                ->select();
        } catch (\Exception $e) {
            Log::error("获取分表列表失败: " . $e->getMessage());
            return [];
        }
    }

    /**
     * 根据时间范围获取需要查询的表
     * @param int $startTime 开始时间戳
     * @param int $endTime 结束时间戳
     * @return array 表名数组
     */
    public static function getTablesByTimeRange($startTime = null, $endTime = null)
    {
        try {
            $query = Db::name('vs_give_gift_tables');

            if ($startTime !== null) {
                $query->where('end_time', '>=', $startTime);
            }

            if ($endTime !== null) {
                $query->where('start_time', '<=', $endTime);
            }

            $tables = $query->order('start_time', 'asc')
                ->column('table_name');

            return $tables ?: [];
        } catch (\Exception $e) {
            Log::error("获取时间范围分表失败: " . $e->getMessage());
            return [];
        }
    }

    /**
     * 初始化分表系统
     * @param string $startMonth 起始年月 202401
     * @param int $months 创建几个月
     * @return array
     */
    public static function initTables($startMonth = null, $months = 24)
    {
        if (!$startMonth) {
            $startMonth = date('Ym');
        }

        $results = [];
        $startDate = new \DateTime($startMonth . '01');

        for ($i = 0; $i < $months; $i++) {
            $currentDate = clone $startDate;
            $currentDate->modify("+{$i} month");
            $yearMonth = $currentDate->format('Ym');

            try {
                $result = self::createMonthTable($yearMonth);
                $results[$yearMonth] = $result;
            } catch (\Exception $e) {
                $results[$yearMonth] = false;
            }
        }

        return $results;
    }

    /**
     * 检查并创建当前月份的表
     * @return bool
     */
    public static function checkAndCreateCurrentMonthTable()
    {
        $currentMonth = date('Ym');
        return self::createMonthTable($currentMonth);
    }
}