<?php

namespace App\Services\AgentSettlement;

use App\Models\AgentNode;
use App\Services\Agent\AgentCreditAllocatedSyncService;
use App\Support\AgentSettlementPeriodWindow;
use App\Support\AgentSettlementProductionGuard;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\ValidationException;

final class AgentSettlementPeriodCloseService
{
    public function __construct(
        private readonly AgentPeriodAggregator $aggregator,
        private readonly SettlementBillGenerator $billGenerator,
        private readonly PeriodCloseRebateService $periodCloseRebate,
        private readonly UnsettledTicketPeriodWarning $unsettledWarning,
        private readonly PlatformRoundingAdjuster $platformRounding,
        private readonly AgentCreditAllocatedSyncService $allocatedSync,
    ) {}

    /**
     * @return array<string, mixed>
     */
    public function closePeriod(int $periodId): array
    {
        AgentSettlementProductionGuard::assertProductionCloseAllowed();

        $period = DB::table('settlement_periods')->where('id', $periodId)->first();
        if ($period === null) {
            throw ValidationException::withMessages([
                'period' => ['period_not_found'],
            ]);
        }

        if ((string) $period->status === 'closed' || (string) $period->status === 'completed') {
            throw ValidationException::withMessages([
                'period' => ['period_already_closed'],
            ]);
        }

        $adminSiteId = (int) $period->admin_site_id;
        [$periodStart, $periodEnd] = AgentSettlementPeriodWindow::boundStrings(
            (string) $period->period_start,
            (string) $period->period_end,
        );

        try {
            $aggregate = $this->aggregator->aggregate($adminSiteId, $periodStart, $periodEnd);
        } catch (\InvalidArgumentException $e) {
            if (str_starts_with($e->getMessage(), 'share_snapshot_missing')) {
                throw ValidationException::withMessages([
                    'period' => ['share_snapshot_missing'],
                ]);
            }

            throw $e;
        }

        $billIds = $this->billGenerator->generate($periodId, $adminSiteId, $aggregate);

        $roundingDiff = $this->platformRounding->apply($periodId, $aggregate);

        $rebateStats = $this->periodCloseRebate->dispatchAndAllocate($periodId, $periodStart, $periodEnd);

        $unsettled = $this->unsettledWarning->countForSite($adminSiteId, $periodStart, $periodEnd);

        DB::table('settlement_periods')->where('id', $periodId)->update([
            'status' => 'closed',
            'updated_at' => now(),
        ]);

        $siteCode = (string) DB::table('admin_sites')->where('id', $adminSiteId)->value('code');

        DB::table('share_ledger')
            ->whereIn('id', function ($query) use ($siteCode, $periodStart, $periodEnd): void {
                $query->select('sl.id')
                    ->from('share_ledger as sl')
                    ->join('players as p', 'p.id', '=', 'sl.player_id')
                    ->where('p.site_code', $siteCode)
                    ->whereNull('sl.settlement_period_id')
                    ->whereBetween('sl.settled_at', [$periodStart, $periodEnd]);
            })
            ->update(['settlement_period_id' => $periodId]);

        $this->reconcileAllocatedCreditForSite($adminSiteId);

        return [
            'period_id' => $periodId,
            'bill_ids' => $billIds,
            'player_count' => count($aggregate['players']),
            'agent_edges' => $aggregate['agent_edges'],
            'rebate_dispatched' => $rebateStats['dispatched'],
            'rebate_allocations' => $rebateStats['allocations'],
            'unsettled_ticket_count' => $unsettled['count'],
            'unsettled_ticket_sample' => $unsettled['ticket_item_ids'],
            'platform_rounding_adjustment' => $roundingDiff,
        ];
    }

    /** 关账后按真理源重算各代理「已下发额度」，避免与直属玩家/下级代理授信脱节。 */
    private function reconcileAllocatedCreditForSite(int $adminSiteId): void
    {
        $nodes = AgentNode::query()->where('admin_site_id', $adminSiteId)->get();
        foreach ($nodes as $node) {
            $this->allocatedSync->syncForAgent($node);
        }
    }
}