<?php
// +----------------------------------------------------------------------
// | Niucloud-admin 企业快速开发的多应用管理平台
// +----------------------------------------------------------------------
// | 官方网址：https://www.niucloud.com
// +----------------------------------------------------------------------
// | niucloud团队 版权所有 开源版本可自由商用
// +----------------------------------------------------------------------
// | Author: Niucloud Team
// +----------------------------------------------------------------------

namespace app\service\admin\salary;

use app\model\salary\Salary;
use core\base\BaseAdminService;

/**
 * 工资统计分析服务类
 * Class StatisticsService
 * @package app\service\admin\salary
 */
class StatisticsService extends BaseAdminService
{
    /**
     * 获取工资统计摘要
     * @param array $where
     * @return array
     */
    public function getSummary(array $where)
    {
        $query = Salary::alias('s')
            ->leftJoin('school_campus_person_role cpr', 's.staff_id = cpr.person_id')
            ->leftJoin('school_campus c', 'cpr.campus_id = c.id');
            
        // 筛选条件
        if (!empty($where['campus_id'])) {
            $query->where('cpr.campus_id', $where['campus_id']);
        }
        if (!empty($where['salary_month'])) {
            $query->where('s.salary_month', 'like', $where['salary_month'] . '%');
        }
        
        // 总体统计
        $summary = $query->field([
            'COUNT(s.id) as total_employees',
            'SUM(s.net_salary) as total_amount',
            'AVG(s.net_salary) as average_salary'
        ])->find();
        
        // 各校区统计
        $campusStats = Salary::alias('s')
            ->leftJoin('school_campus_person_role cpr', 's.staff_id = cpr.person_id')
            ->leftJoin('school_campus c', 'cpr.campus_id = c.id')
            ->field([
                'IFNULL(cpr.campus_id, 0) as campus_id',
                'CASE WHEN cpr.campus_id IS NULL OR cpr.campus_id = 0 THEN "总部" ELSE c.campus_name END as campus_name',
                'COUNT(s.id) as employee_count',
                'SUM(s.net_salary) as total_amount'
            ]);
            
        // 筛选条件
        if (!empty($where['campus_id'])) {
            $campusStats->where('cpr.campus_id', $where['campus_id']);
        }
        if (!empty($where['salary_month'])) {
            $campusStats->where('s.salary_month', 'like', $where['salary_month'] . '%');
        }
            
        $campusStats = $campusStats->group('cpr.campus_id')->select();
            
        return [
            'total_employees' => $summary['total_employees'] ?? 0,
            'total_amount' => $summary['total_amount'] ?? 0,
            'average_salary' => round($summary['average_salary'] ?? 0, 2),
            'cost_rate' => 65.2, // 这里需要根据实际业务计算
            'campus_stats' => $campusStats
        ];
    }
    
    /**
     * 获取工资趋势数据
     * @param array $where
     * @return array
     */
    public function getTrend(array $where)
    {
        $query = Salary::alias('s')
            ->leftJoin('school_campus_person_role cpr', 's.staff_id = cpr.person_id');
            
        if (!empty($where['campus_id'])) {
            $query->where('cpr.campus_id', $where['campus_id']);
        }
        
        // 默认查询近12个月
        if (empty($where['start_month'])) {
            $where['start_month'] = date('Y-m', strtotime('-11 months'));
        }
        if (empty($where['end_month'])) {
            $where['end_month'] = date('Y-m');
        }
        
        $trend = $query->field([
            'DATE_FORMAT(s.salary_month, "%Y-%m") as month',
            'SUM(s.net_salary) as total_amount',
            'COUNT(s.id) as employee_count'
        ])
        ->where('s.salary_month', 'between', [
            $where['start_month'] . '-01',
            $where['end_month'] . '-31'
        ])
        ->group('DATE_FORMAT(s.salary_month, "%Y-%m")')
        ->order('month')
        ->select();
        
        return $trend;
    }
}