<?php

namespace App\Services\Config;

use App\Lottery\ConfigVersionStatus;
use App\Models\Currency;
use App\Models\OddsItem;
use App\Models\OddsVersion;
use App\Models\PlayConfigItem;
use App\Models\PlayConfigVersion;
use App\Models\PlayType;
use App\Models\RiskCapItem;
use App\Models\RiskCapVersion;
use Illuminate\Support\Collection;

/**
 * 玩家端：当前生效的玩法目录 + 三套版本快照（只读）。
 */
final class EffectivePlayCatalogService
{
    /**
     * @return array<string, mixed>
     */
    public function build(?string $currencyCode = null): array
    {
        $currency = $this->resolveBettableCurrency($currencyCode);

        $playVersion = PlayConfigVersion::query()
            ->where('status', ConfigVersionStatus::Active->value)
            ->firstOrFail();

        $oddsVersion = OddsVersion::query()
            ->where('status', ConfigVersionStatus::Active->value)
            ->firstOrFail();

        $riskVersion = RiskCapVersion::query()
            ->where('status', ConfigVersionStatus::Active->value)
            ->firstOrFail();

        $playTypes = PlayType::query()->orderBy('sort_order')->orderBy('play_code')->get();

        /** @var Collection<string, PlayConfigItem> $configByCode */
        $configByCode = PlayConfigItem::query()
            ->where('version_id', $playVersion->id)
            ->get()
            ->keyBy('play_code');

        $oddsRows = OddsItem::query()
            ->where('version_id', $oddsVersion->id)
            ->where('currency_code', $currency->code)
            ->get();

        /** @var Collection<string, Collection<int, OddsItem>> */
        $oddsByPlay = $oddsRows->groupBy('play_code');

        $riskItems = RiskCapItem::query()
            ->where('version_id', $riskVersion->id)
            ->orderBy('normalized_number')
            ->get();

        $plays = $playTypes->map(function (PlayType $pt) use ($configByCode, $oddsByPlay): array {
            $c = $configByCode->get($pt->play_code);
            $items = $oddsByPlay->get($pt->play_code, collect());
            $o = $this->pickPrimaryOddsItem($items);

            return [
                'play_code' => $pt->play_code,
                'category' => $pt->category,
                'dimension' => $pt->dimension,
                'bet_mode' => $pt->bet_mode,
                'display_name_zh' => $pt->display_name_zh,
                'display_name_en' => $pt->display_name_en,
                'display_name_ne' => $pt->display_name_ne,
                'sort_order' => (int) $pt->sort_order,
                'supports_multi_number' => (bool) $pt->supports_multi_number,
                'master_enabled' => (bool) $pt->is_enabled,
                'config' => $c === null ? null : $this->serializePlayConfigItem($c),
                'odds' => $o === null ? null : $this->serializeOddsItem($o),
            ];
        })->values()->all();

        return [
            'currency_code' => $currency->code,
            'effective_versions' => [
                'play_config' => $this->serializeVersionHead($playVersion),
                'odds' => $this->serializeVersionHead($oddsVersion),
                'risk_cap' => $this->serializeVersionHead($riskVersion),
            ],
            'plays' => $plays,
            'risk_cap_items' => $riskItems->map(fn (RiskCapItem $r) => $this->serializeRiskItem($r))->all(),
        ];
    }

    /**
     * 大厅列表展示单档赔率：优先头奖档 {@see first}，兼容历史 {@see default}。
     *
     * @param  Collection<int, OddsItem>  $items
     */
    private function pickPrimaryOddsItem(Collection $items): ?OddsItem
    {
        if ($items->isEmpty()) {
            return null;
        }

        foreach (['first', 'default', 'second', 'third', 'starter', 'consolation'] as $scope) {
            $hit = $items->firstWhere('prize_scope', $scope);
            if ($hit !== null) {
                return $hit;
            }
        }

        return $items->first();
    }

    private function resolveBettableCurrency(?string $currencyCode): Currency
    {
        if ($currencyCode !== null && $currencyCode !== '') {
            $row = Currency::query()->where('code', strtoupper($currencyCode))->first();
            if ($row === null || ! $row->is_enabled || ! $row->is_bettable) {
                throw new \InvalidArgumentException('currency');
            }

            return $row;
        }

        return Currency::query()
            ->where('is_enabled', true)
            ->where('is_bettable', true)
            ->orderBy('code')
            ->firstOrFail();
    }

    /** @return array<string, mixed> */
    private function serializeVersionHead(PlayConfigVersion|OddsVersion|RiskCapVersion $v): array
    {
        return [
            'id' => (int) $v->getKey(),
            'version_no' => (int) $v->version_no,
            'effective_at' => $v->effective_at?->toIso8601String(),
        ];
    }

    /** @return array<string, mixed> */
    private function serializePlayConfigItem(PlayConfigItem $r): array
    {
        return [
            'is_enabled' => (bool) $r->is_enabled,
            'min_bet_amount' => (int) $r->min_bet_amount,
            'max_bet_amount' => (int) $r->max_bet_amount,
            'display_order' => (int) $r->display_order,
            'rule_text_zh' => $r->rule_text_zh,
            'rule_text_en' => $r->rule_text_en,
            'rule_text_ne' => $r->rule_text_ne,
            'extra_config_json' => $r->extra_config_json,
        ];
    }

    /** @return array<string, mixed> */
    private function serializeOddsItem(OddsItem $r): array
    {
        return [
            'prize_scope' => $r->prize_scope,
            'odds_value' => (int) $r->odds_value,
            'rebate_rate' => (string) $r->rebate_rate,
            'commission_rate' => (string) $r->commission_rate,
            'currency_code' => $r->currency_code,
            'extra_config_json' => $r->extra_config_json,
            /** 赔率乘数小数位 = odds_value / 10000 */
            'odds_multiplier' => round($r->odds_value / 10000, 4),
        ];
    }

    /** @return array<string, mixed> */
    private function serializeRiskItem(RiskCapItem $r): array
    {
        return [
            'draw_id' => $r->draw_id,
            'normalized_number' => $r->normalized_number,
            'cap_amount' => (int) $r->cap_amount,
            'cap_type' => $r->cap_type,
        ];
    }
}