<?php

namespace App\Service;

use Carbon\Carbon;
use Illuminate\Support\Facades\DB;

class RdGenerateService extends Service
{
    public function generate(array $data)
    {
        if (empty($data['month'])) {
            return [false, '请选择生成研发人员工时单年月'];
        }

        try {
            DB::transaction(function () use ($data) {
                $this->doGenerate($data['month']);
            });
        } catch (\Throwable $e) {
            return [false, $e->getMessage()];
        }

        return [true, ''];
    }

    protected function doGenerate(string $month)
    {
        $monthStart = Carbon::createFromFormat('Y-m', $month)->startOfMonth()->timestamp;
        $monthEnd   = Carbon::createFromFormat('Y-m', $month)->endOfMonth()->timestamp;

        // 日历
        $calendar = DB::table('calendar')
            ->where('time', $monthStart)
            ->first();

        if (!$calendar) {
            throw new \Exception('当月日历未配置');
        }

        // 工作日
        $workDays = DB::table('calendar_details')
            ->where('calendar_id', $calendar->id)
            ->where('is_work', 1)
            ->orderBy('time')
            ->pluck('time')
            ->toArray();

        if (empty($workDays)) {
            throw new \Exception('当月无工作日');
        }

        // 启用项目
        $items = DB::table('item')
            ->where('is_use', 1)
            ->where('start_time', '<=', $monthEnd)
            ->where('end_time', '>=', $monthStart)
            ->get();

        // 删除当月所有项目的老数据
        $itemIds = $items->pluck('id')->toArray();
        if (!empty($itemIds)) {
            $rds = DB::table('rd')
                ->whereIn('item_id', $itemIds)
                ->whereBetween('order_time', [$monthStart, $monthEnd])
                ->pluck('id')
                ->toArray();

            if (!empty($rds)) {
                DB::table('rd_details')->whereIn('rd_id', $rds)->delete();
                DB::table('rd')->whereIn('id', $rds)->delete();
            }
        }

        // 获取所有员工id
        $employeeIds = DB::table('item_details')
            ->whereIn('item_id', $itemIds)
            ->where('type', 1)
            ->pluck('data_id')
            ->unique()
            ->toArray();

        // 按员工生成当月工时单
        foreach ($employeeIds as $employeeId) {
            $this->generateEmployeeMonth($employeeId, $items, $workDays, $calendar);
        }
    }

    /**
     * 按员工生成当月工时单，严格保证总工时匹配
     */
    protected function generateEmployeeMonth(int $employeeId, $items, array $workDays, $calendar)
    {
        $employeeMonth = DB::table('employee_details')
            ->where('employee_id', $employeeId)
            ->where('time', $calendar->time)
            ->first();

        if (!$employeeMonth || $employeeMonth->total_hours_2 <= 0) {
            return;
        }

        $totalMinutes = (int)round($employeeMonth->total_hours_2 * 60); // 员工总分钟数
        $dayMaxMinutes = 510; // 每天最大分钟数 (含午休)

        // 员工参与的项目
        $employeeItems = [];
        foreach ($items as $item) {
            $exists = DB::table('item_details')
                ->where('item_id', $item->id)
                ->where('type', 1)
                ->where('data_id', $employeeId)
                ->exists();
            if ($exists) {
                $employeeItems[] = $item;
            }
        }

        if (empty($employeeItems)) return;

        // 生成所有槽位：项目 × 工作日（有效周期内）
        $slots = [];
        foreach ($employeeItems as $item) {
            foreach ($workDays as $day) {
                if ($day >= $item->start_time && $day <= $item->end_time) {
                    $slots[] = [
                        'item_id' => $item->id,
                        'day' => $day
                    ];
                }
            }
        }

        if (empty($slots)) return;

        // 均分总分钟数
        $numSlots = count($slots);
        $baseMinutes = floor($totalMinutes / $numSlots);
        $remainder = $totalMinutes - $baseMinutes * $numSlots;

        foreach ($slots as $i => $slot) {
            $minutes = $baseMinutes;
            if ($i === $numSlots - 1) {
                // 最后 slot 补齐余数
                $minutes += $remainder;
            }

            // 确保单日不超过最大分钟数
            $minutes = min($minutes, $dayMaxMinutes - 30); // 扣掉午休

            $this->createRd($slot['item_id'], $slot['day'], $minutes, $employeeId);
        }
    }

    /**
     * 创建单条研发工时单
     */
    protected function createRd(int $itemId, int $dayTime, int $minutes, int $employeeId)
    {
        $dayStart = Carbon::createFromTimestamp($dayTime)->setTime(8, 0);
        $lunchStart = Carbon::createFromTimestamp($dayTime)->setTime(11, 30);
        $lunchEnd   = Carbon::createFromTimestamp($dayTime)->setTime(12, 0);
        $dayEnd = Carbon::createFromTimestamp($dayTime)->setTime(16, 30);

        // 上午可用分钟
        $morningMinutes = $lunchStart->diffInMinutes($dayStart);
        // 下午可用分钟
        $afternoonMinutes = $dayEnd->diffInMinutes($lunchEnd);

        // 确保总工时不会超过全天可用分钟
        $minutes = min($minutes, $morningMinutes + $afternoonMinutes);

        // 决定工时分配到上午和下午
        if ($minutes <= $morningMinutes) {
            $start = $dayStart->copy()->addMinutes(mt_rand(0, $morningMinutes - $minutes));
            $end = $start->copy()->addMinutes($minutes);
        } elseif ($minutes <= $afternoonMinutes) {
            $start = $lunchEnd->copy()->addMinutes(mt_rand(0, $afternoonMinutes - $minutes));
            $end = $start->copy()->addMinutes($minutes);
        } else {
            // 分两段：上午尽量满，剩余在下午
            $start = $dayStart->copy();
            $end = $lunchEnd->copy()->addMinutes($minutes - $morningMinutes);
        }

        // 调整到整5分钟
        $start->minute = ceil($start->minute / 5) * 5;
        $end->minute = ceil($end->minute / 5) * 5;

        // crt_time 16:30 ~ 17:00
        $crtTime = Carbon::createFromTimestamp($dayTime)
            ->setTime(16, 30)
            ->addSeconds(mt_rand(0, 30*60))
            ->timestamp;

        $dayPrefix = date('Ymd', $dayTime);
        $orderNumber = 'RD' . $dayPrefix . mt_rand(1000, 9999) . substr(uniqid(), -3);

        $rdId = DB::table('rd')->insertGetId([
            'crt_time' => $crtTime,
            'order_time' => $dayTime,
            'item_id' => $itemId,
            'start_time_hour' => $start->hour,
            'start_time_min' => $start->minute,
            'end_time_hour' => $end->hour,
            'end_time_min' => $end->minute,
            'total_hours' => $minutes,
            'order_number' => $orderNumber,
            'type' => 1
        ]);

        DB::table('rd_details')->insert([
            'rd_id' => $rdId,
            'data_id' => $employeeId,
            'type' => 1,
            'crt_time' => $crtTime,
            'upd_time' => $crtTime,
        ]);
    }

}