<?php

namespace App\Services\Agent;

use App\Models\Agent\Agent;
use App\Models\Agent\AgentEquityOrder;
use App\Models\Agent\AgentSetting;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;

/**
 * 入股：代理在独立后台选择购买比例，金额 = 比例 × 每 1% 价格。
 * 余额足够立即扣款开通；不够则生成待付款订单，USDT 充值到账后自动扣款开通，无需审核。
 * 分红每月由总后台根据报表人工发放。
 */
class AgentEquityService
{
    public function __construct(private AgentWalletService $wallets)
    {
    }

    public function overview(Agent $agent): array
    {
        $setting = AgentSetting::current();
        $pending = AgentEquityOrder::query()->where('agent_id', $agent->id)->where('status', AgentEquityOrder::STATUS_PENDING)->first();
        $held = bcadd((string) $agent->equity_percent, '0', 4);
        $remaining = bcsub((string) $setting->equity_max_percent, $held, 4);
        return [
            'enabled' => (int) $setting->equity_enabled,
            'price_per_percent' => (string) $setting->equity_price_per_percent,
            'min_percent' => (string) $setting->equity_min_percent,
            'max_percent' => (string) $setting->equity_max_percent,
            'equity_percent' => $held,
            'remaining_percent' => bccomp($remaining, '0', 4) > 0 ? $remaining : '0.0000',
            'balance' => (string) $agent->balance,
            'pending_order' => $pending,
        ];
    }

    public function order(Agent $agent, string $percent): AgentEquityOrder
    {
        $order = DB::transaction(function () use ($agent, $percent) {
            $agent = Agent::query()->lockForUpdate()->findOrFail($agent->id);
            if (!$agent->isEquity()) throw new \RuntimeException('只有入股代理可以购买股份');
            $setting = AgentSetting::current();
            if (!(int) $setting->equity_enabled || bccomp((string) $setting->equity_price_per_percent, '0', 4) <= 0) {
                throw new \RuntimeException('入股暂未开放');
            }
            if (bccomp($percent, (string) $setting->equity_min_percent, 4) < 0 || bccomp($percent, (string) $setting->equity_max_percent, 4) > 0) {
                throw new \InvalidArgumentException("购买比例须在 {$setting->equity_min_percent}% 至 {$setting->equity_max_percent}% 之间");
            }
            if (AgentEquityOrder::query()->where('agent_id', $agent->id)->where('status', AgentEquityOrder::STATUS_PENDING)->exists()) {
                throw new \RuntimeException('已有待付款的入股订单，请先充值或取消');
            }
            if (bccomp(bcadd((string) $agent->equity_percent, $percent, 4), (string) $setting->equity_max_percent, 4) > 0) {
                throw new \RuntimeException("累计持股不能超过 {$setting->equity_max_percent}%");
            }
            return AgentEquityOrder::query()->create([
                'order_no' => 'AE' . now()->format('YmdHis') . strtoupper(Str::random(6)),
                'agent_id' => $agent->id, 'percent' => bcadd($percent, '0', 4),
                'price_per_percent' => (string) $setting->equity_price_per_percent,
                'amount' => bcmul($percent, (string) $setting->equity_price_per_percent, 4),
                'status' => AgentEquityOrder::STATUS_PENDING,
            ]);
        });
        $this->fulfillPending((int) $agent->id);
        return $order->fresh();
    }

    public function cancel(Agent $agent, int $orderId): AgentEquityOrder
    {
        return $this->cancelOrder(fn ($query) => $query->where('agent_id', $agent->id), $orderId, null, '');
    }

    /** 总后台取消待付款订单（如代理长期不充值），需填写原因。 */
    public function adminCancel(int $orderId, int $adminId, string $remark): AgentEquityOrder
    {
        $remark = trim($remark);
        if ($remark === '') throw new \InvalidArgumentException('请填写取消原因');
        return $this->cancelOrder(fn ($query) => $query, $orderId, $adminId, $remark);
    }

    private function cancelOrder(callable $scope, int $orderId, ?int $adminId, string $remark): AgentEquityOrder
    {
        return DB::transaction(function () use ($scope, $orderId, $adminId, $remark) {
            $order = $scope(AgentEquityOrder::query())->lockForUpdate()->findOrFail($orderId);
            if ($order->status !== AgentEquityOrder::STATUS_PENDING) throw new \RuntimeException('只有待付款订单可以取消');
            $order->status = AgentEquityOrder::STATUS_CANCELLED;
            $order->cancelled_by = $adminId;
            $order->cancel_remark = $remark;
            $order->save();
            return $order;
        });
    }

    /**
     * 总后台：全部代理的入股购买记录。summary 按当前筛选条件汇总：
     * 已开通的比例和金额、待付款笔数和金额。
     */
    public function paginate(array $params): array
    {
        $page = max(1, (int) ($params['page'] ?? 1));
        $limit = min(100, max(1, (int) ($params['limit'] ?? 20)));
        $query = AgentEquityOrder::query();
        if (!empty($params['agent_id'])) $query->where('agent_id', (int) $params['agent_id']);
        if (!empty($params['username'])) {
            $query->whereIn('agent_id', Agent::query()->where('username', 'like', '%' . $params['username'] . '%')->select('id'));
        }
        if (!empty($params['order_no'])) $query->where('order_no', $params['order_no']);
        if (!empty($params['status'])) $query->where('status', $params['status']);
        $dateColumn = ($params['date_type'] ?? '') === 'completed_at' ? 'completed_at' : 'created_at';
        if (!empty($params['start_date'])) $query->where($dateColumn, '>=', $params['start_date'] . ' 00:00:00');
        if (!empty($params['end_date'])) $query->where($dateColumn, '<=', $params['end_date'] . ' 23:59:59');

        $sums = (clone $query)->selectRaw(
            'COALESCE(SUM(CASE WHEN status = ? THEN percent ELSE 0 END), 0) AS completed_percent, '
            . 'COALESCE(SUM(CASE WHEN status = ? THEN amount ELSE 0 END), 0) AS completed_amount, '
            . 'COALESCE(SUM(CASE WHEN status = ? THEN 1 ELSE 0 END), 0) AS pending_count, '
            . 'COALESCE(SUM(CASE WHEN status = ? THEN amount ELSE 0 END), 0) AS pending_amount',
            [AgentEquityOrder::STATUS_COMPLETED, AgentEquityOrder::STATUS_COMPLETED, AgentEquityOrder::STATUS_PENDING, AgentEquityOrder::STATUS_PENDING]
        )->first();
        $total = (clone $query)->count();
        $list = $query->with('agent:id,username,real_name,type,equity_percent,balance')->orderByDesc('id')->forPage($page, $limit)->get();
        $summary = [
            'completed_percent' => bcadd((string) $sums->completed_percent, '0', 4),
            'completed_amount' => bcadd((string) $sums->completed_amount, '0', 4),
            'pending_count' => (int) $sums->pending_count,
            'pending_amount' => bcadd((string) $sums->pending_amount, '0', 4),
            // 全平台入股代理当前持股合计（不受筛选影响）
            'total_equity_percent' => bcadd((string) Agent::query()->where('type', Agent::TYPE_EQUITY)->sum('equity_percent'), '0', 4),
        ];
        return compact('total', 'page', 'limit', 'list', 'summary');
    }

    /** 余额足够时完成待付款订单（下单后、充值到账后调用）。 */
    public function fulfillPending(int $agentId): int
    {
        return DB::transaction(function () use ($agentId) {
            $agent = Agent::query()->lockForUpdate()->findOrFail($agentId);
            if (!$agent->isEquity()) return 0;
            $done = 0;
            $orders = AgentEquityOrder::query()->where('agent_id', $agentId)->where('status', AgentEquityOrder::STATUS_PENDING)
                ->orderBy('id')->lockForUpdate()->get();
            foreach ($orders as $order) {
                if (bccomp((string) $agent->balance, (string) $order->amount, 4) < 0) break;
                $this->wallets->adjust($agentId, (string) $order->amount, 'equity_purchase', '购买股份 ' . $order->percent . '%',
                    'equity-order:' . $order->id, 'agent', $agentId, 'agent_equity_order', (int) $order->id);
                $agent = Agent::query()->lockForUpdate()->findOrFail($agentId);
                $agent->equity_percent = bcadd((string) $agent->equity_percent, (string) $order->percent, 4);
                $agent->save();
                $order->status = AgentEquityOrder::STATUS_COMPLETED;
                $order->completed_at = now();
                $order->save();
                ++$done;
            }
            return $done;
        });
    }
}