<?php

namespace App\Services\Ticket;

use App\Models\RiskPool;
use App\Lottery\ErrorCode;
use App\Models\TicketItem;
use App\Models\RiskPoolLockLog;
use App\Exceptions\TicketOperationException;

final class RiskPoolService
{
    public function __construct(
        private readonly PlayCatalogResolver $catalogResolver,
    ) {}

    /**
     * @param  list<array{number_4d:string, amount:int}>  $locks
     * @return list<array{number_4d:string, amount:int, warning:bool}>
     */
    public function preview(int $drawId, array $locks): array
    {
        $rows = [];
        foreach ($locks as $lock) {
            $pool = $this->firstOrMakePool($drawId, $lock['number_4d']);
            $remaining = (int) $pool->remaining_amount;
            if ($remaining < (int) $lock['amount']) {
                throw new TicketOperationException('risk_sold_out', ErrorCode::RiskPoolSoldOut->value);
            }

            $usage = (int) $pool->total_cap_amount > 0
                ? ((int) $pool->locked_amount + (int) $lock['amount']) / (int) $pool->total_cap_amount
                : 1;

            $rows[] = [
                'number_4d' => $lock['number_4d'],
                'amount' => (int) $lock['amount'],
                'warning' => $usage >= 0.8,
            ];
        }

        return $rows;
    }

    /**
     * @param  list<array{number_4d:string, amount:int}>  $locks
     */
    public function acquire(int $drawId, ?TicketItem $ticketItem, array $locks): int
    {
        $total = 0;
        foreach ($locks as $lock) {
            $pool = RiskPool::query()
                ->where('draw_id', $drawId)
                ->where('normalized_number', $lock['number_4d'])
                ->lockForUpdate()
                ->first();

            if ($pool === null) {
                $pool = $this->createPool($drawId, $lock['number_4d']);
                $pool = RiskPool::query()
                    ->where('draw_id', $drawId)
                    ->where('normalized_number', $lock['number_4d'])
                    ->lockForUpdate()
                    ->firstOrFail();
            }

            $amount = (int) $lock['amount'];
            if ((int) $pool->remaining_amount < $amount) {
                throw new TicketOperationException('risk_sold_out', ErrorCode::RiskPoolSoldOut->value);
            }

            $pool->forceFill([
                'locked_amount' => (int) $pool->locked_amount + $amount,
                'remaining_amount' => (int) $pool->remaining_amount - $amount,
                'sold_out_status' => ((int) $pool->remaining_amount - $amount) <= 0 ? 1 : 0,
                'version' => (int) $pool->version + 1,
            ])->save();

            RiskPoolLockLog::query()->create([
                'draw_id' => $drawId,
                'normalized_number' => $lock['number_4d'],
                'ticket_item_id' => $ticketItem?->id,
                'action_type' => 'lock',
                'amount' => $amount,
                'source_reason' => 'ticket_place',
                'created_at' => now(),
            ]);

            $total += $amount;
        }

        return $total;
    }

    /**
     * @param  list<array{number_4d:string, amount:int}>  $locks
     */
    public function release(int $drawId, ?TicketItem $ticketItem, array $locks): void
    {
        foreach ($locks as $lock) {
            $pool = RiskPool::query()
                ->where('draw_id', $drawId)
                ->where('normalized_number', $lock['number_4d'])
                ->lockForUpdate()
                ->first();

            if ($pool === null) {
                continue;
            }

            $amount = min((int) $lock['amount'], (int) $pool->locked_amount);
            $pool->forceFill([
                'locked_amount' => (int) $pool->locked_amount - $amount,
                'remaining_amount' => (int) $pool->remaining_amount + $amount,
                'sold_out_status' => 0,
                'version' => (int) $pool->version + 1,
            ])->save();

            RiskPoolLockLog::query()->create([
                'draw_id' => $drawId,
                'normalized_number' => $lock['number_4d'],
                'ticket_item_id' => $ticketItem?->id,
                'action_type' => 'release',
                'amount' => $amount,
                'source_reason' => 'ticket_rollback',
                'created_at' => now(),
            ]);
        }
    }

    private function firstOrMakePool(int $drawId, string $number4d): RiskPool
    {
        return RiskPool::query()->firstOrCreate(
            ['draw_id' => $drawId, 'normalized_number' => $number4d],
            [
                'total_cap_amount' => $this->catalogResolver->resolveCapAmount($drawId, $number4d),
                'locked_amount' => 0,
                'remaining_amount' => $this->catalogResolver->resolveCapAmount($drawId, $number4d),
                'sold_out_status' => 0,
                'version' => 0,
            ],
        );
    }

    private function createPool(int $drawId, string $number4d): RiskPool
    {
        $cap = $this->catalogResolver->resolveCapAmount($drawId, $number4d);

        return RiskPool::query()->create([
            'draw_id' => $drawId,
            'normalized_number' => $number4d,
            'total_cap_amount' => $cap,
            'locked_amount' => 0,
            'remaining_amount' => $cap,
            'sold_out_status' => 0,
            'version' => 0,
        ]);
    }
}