<?php

namespace App\Console\Commands\Dealer;

use App\Enums\DealerManagerSubsidyStatus;
use App\Models\Dealer;
use App\Models\DealerManagerSalesLog;
use App\Models\DealerManagerSubsidy;
use Illuminate\Console\Command;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\DB;

class ManagerSubsidySettleCommand extends Command
{
    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'dealer:manager-subsidy-settle';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = '结算上个月的管理者津贴';

    /**
     * Execute the console command.
     *
     * @return int
     */
    public function handle()
    {
        $tz = now();

        $startAt = $tz->copy()->subMonthNoOverflow()->startOfMonth();
        $endAt = $startAt->copy()->endOfMonth();

        $head = '【'.$startAt->format('Y/m/d').'-'.$endAt->format('Y/m/d').'】';

        $this->info("{$head}------------[开始]管理者津贴结算------------".PHP_EOL);

        $this->info("{$head}管理者津贴初始化...");
        $this->initializeManagerSubsidies($startAt, $endAt, 500);
        $this->info("{$head}管理者津贴初始化完成".PHP_EOL);

        $this->info("{$head}管理者津贴结算...");
        $this->settleManagerSubsidies($startAt, $endAt);
        $this->info("{$head}管理者津贴结算完成".PHP_EOL);

        $this->info("{$head}Done! 总耗时: ".$this->formatDuration($tz->diffInMilliseconds(now(), false)));
        $this->info("{$head}------------[结束]管理者津贴结算------------".PHP_EOL);

        return 0;
    }

    /**
     * 初始化管理者津贴
     *
     * @param \Illuminate\Support\Carbon $startAt
     * @param \Illuminate\Support\Carbon $endAt
     * @param int $count
     * @return void
     */
    protected function initializeManagerSubsidies(Carbon $startAt, Carbon $endAt, $count = 200): void
    {
        $feeRate = app_settings('dealer.fee_rate');

        $lastId = $this->getLastDealerId($startAt, $endAt);

        do {
            $dealers = Dealer::where('is_manager', true)
                            ->forPageAfterId($count, $lastId, 'id')
                            ->get();

            $dealersCount = $dealers->count();

            if ($dealersCount == 0) {
                break;
            }

            $managerSubsidies = [];
            $tz = now()->toDateTimeString();

            foreach ($dealers as $dealer) {
                $managerSubsidies[] = [
                    'user_id' => $dealer->user_id,
                    'total_amount' => 0,
                    'real_amount' => 0,
                    'fee' => 0,
                    'fee_rate' => $feeRate,
                    'start_at' => $startAt,
                    'end_at' => $endAt,
                    'lvl' => $dealer->lvl,
                    'is_manager' => $dealer->is_manager,
                    'status' => DealerManagerSubsidyStatus::Pending,
                    'is_settle' => false,
                    'created_at' => $tz,
                    'updated_at' => $tz,
                ];

                $lastId = $dealer->id;
            }

            DealerManagerSubsidy::insert($managerSubsidies);

            unset($dealers, $managerSubsidies);
        } while ($dealersCount == $count);
    }

    /**
     * 结算管理者津贴
     *
     * @param \Illuminate\Support\Carbon $startAt
     * @param \Illuminate\Support\Carbon $endAt
     * @return void
     */
    protected function settleManagerSubsidies(Carbon $startAt, Carbon $endAt)
    {
        DealerManagerSubsidy::where('start_at', $startAt)->where('end_at', $endAt)->where('is_settle', false)->chunkById(500, function ($subsidies) {
            foreach ($subsidies as $subsidy) {
                $this->settleManagerSubsidy($subsidy);
            }
        });
    }

    /**
     * 结算管理者津贴
     *
     * @param \App\Models\DealerManagerSubsidy
     * @return void
     */
    protected function settleManagerSubsidy(DealerManagerSubsidy $subsidy)
    {
        [$totalAmount, $remark] = $this->calculateTotalAmount($subsidy);

        $fee = bcmul($totalAmount, bcdiv($subsidy->fee_rate, '100', 5), 2);

        $subsidy->forceFill([
            'total_amount' => $totalAmount,
            'real_amount' => bcsub($totalAmount, $fee, 2),
            'fee' => $fee,
            'remark' => $remark,
            'is_settle' => true,
        ])->save();
    }

    /**
     * 计算补贴总金额
     *
     * @param \App\Models\Dealer
     * @return array
     */
    protected function calculateTotalAmount(DealerManagerSubsidy $subsidy): array
    {
        $salesLogs = DealerManagerSalesLog::with(['product'])
                            ->select(['product_id', DB::raw('sum(sales_volume) as sales_volume')])
                            ->where('user_id', $subsidy->user_id)
                            ->whereBetween('order_completed_at', [$subsidy->start_at, $subsidy->end_at])
                            ->groupBy('product_id')
                            ->get();

        // 补贴总额
        $totalAmount = 0;
        // 备注信息
        $remark = '';

        foreach ($salesLogs as $salesLog) {
            $amount = bcmul($salesLog->sales_volume, $salesLog->product->manager_subsidy, 2);
            $totalAmount = bcadd($totalAmount, $amount, 2);

            if ($remark !== '') {
                $remark .= "\n";
            }

            $remark .= "【{$salesLog->product->name}】销量: {$salesLog->sales_volume}, 补贴金额: {$amount}";
        }

        return [$totalAmount, $remark];
    }

    /**
     * 获取给定时间端内的最后一个经销商补贴所属经销商的ID
     *
     * @param \Illuminate\Support\Carbon $startAt
     * @param \Illuminate\Support\Carbon $endAt
     * @return int|null
     */
    protected function getLastDealerId(Carbon $startAt, Carbon $endAt): ?int
    {
        $lastManagerSubsidy = DealerManagerSubsidy::where('start_at', $startAt)
                                            ->where('end_at', $endAt)
                                            ->latest('id')
                                            ->first();

        return $lastManagerSubsidy?->dealer?->id;
    }

    /**
     * 格式化时间
     *
     * @param float $milliseconds
     * @return string
     */
    protected function formatDuration($milliseconds): string
    {
        if ($milliseconds < 0.01) {
            return round($milliseconds * 1000) . 'μs';
        } elseif ($milliseconds >= 1000) {
            return round($milliseconds / 1000, 2) . 's';
        }

        return $milliseconds . 'ms';
    }
}