<?php

namespace App\Services\Settlement\Matchers;

use App\Models\TicketItem;
use App\Models\TicketCombination;
use Illuminate\Support\Collection;
use App\Services\Settlement\OddsSnapshotReader;
use App\Services\Settlement\PublishedDrawResultBoard;
use App\Services\Settlement\Contracts\SettlementPlayMatcher;

/** pos_3a / pos_3b / pos_3c：后三位命中对应档。头奖命中时 `matched_prize_tier` 为 first（Jackpot 口径）。 */
final class Pos3TierSettlementMatcher implements SettlementPlayMatcher
{
    /** @var array<string, string> */
    private const PLAY_TO_TIER = [
        'pos_3a' => 'first',
        'pos_3b' => 'second',
        'pos_3c' => 'third',
    ];

    public function __construct(
        private readonly OddsSnapshotReader $odds,
    ) {}

    public function match(TicketItem $item, PublishedDrawResultBoard $board, Collection $combinations): array
    {
        $tier = self::PLAY_TO_TIER[$item->play_code] ?? 'first';
        $suffix = $board->suffix3ForTier($tier, 0);
        if ($suffix === '') {
            return ['win_amount' => 0, 'matched_prize_tier' => null, 'match_detail' => ['reason' => 'no_suffix']];
        }

        $snapshot = is_array($item->odds_snapshot_json) ? $item->odds_snapshot_json : null;
        $oddsVal = $this->odds->oddsValueForScope($snapshot, $tier);
        $lines = [];
        $total = 0;

        foreach ($combinations as $c) {
            /** @var TicketCombination $c */
            $n = (string) $c->number_4d;
            if (strlen($n) < 3 || substr($n, -3) !== $suffix) {
                continue;
            }
            $bet = (int) $c->bet_amount;
            $payout = (int) floor($bet * ($oddsVal / 10_000));
            $total += $payout;
            $lines[] = ['number_4d' => $n, 'suffix3' => $suffix, 'payout' => $payout];
        }

        return [
            'win_amount' => $total,
            'matched_prize_tier' => $total > 0 ? $tier : null,
            'match_detail' => ['lines' => $lines],
        ];
    }
}