<?php

namespace App\Http\Controllers\Api\V1\Admin\Risk;

use App\Http\Controllers\Controller;
use App\Models\Draw;
use App\Models\RiskPool;
use App\Support\ApiResponse;
use Illuminate\Contracts\Pagination\LengthAwarePaginator;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

/**
 * GET /api/v1/admin/draws/{draw}/risk-pools — 按期号分页查询赔付池事实（售罄筛选、排序）。
 *
 * 对齐产品文档：后台查看售罄与风险占用、热门号码监控（按占用排序）。
 */
final class AdminRiskPoolIndexController extends Controller
{
    public function __invoke(Request $request, Draw $draw): JsonResponse
    {
        $perPage = min(max((int) $request->integer('per_page', 25), 1), 100);
        $soldOutOnly = $request->boolean('sold_out_only');
        $sort = trim((string) $request->query('sort', 'usage_desc'));

        $q = RiskPool::query()->where('draw_id', $draw->id);

        if ($soldOutOnly) {
            $q->where('sold_out_status', 1);
        }

        match ($sort) {
            'locked_desc' => $q->orderByDesc('locked_amount')->orderBy('normalized_number'),
            'remaining_asc' => $q->orderBy('remaining_amount')->orderBy('normalized_number'),
            'number_asc' => $q->orderBy('normalized_number'),
            default => $q->orderByRaw('(locked_amount * 1.0 / NULLIF(total_cap_amount, 0)) DESC')
                ->orderByDesc('locked_amount')
                ->orderBy('normalized_number'),
        };

        /** @var LengthAwarePaginator $paginator */
        $paginator = $q->paginate($perPage);

        return ApiResponse::success([
            'draw_id' => (int) $draw->id,
            'draw_no' => $draw->draw_no,
            'items' => collect($paginator->items())->map(fn (RiskPool $row) => $this->row($row))->all(),
            'meta' => [
                'current_page' => $paginator->currentPage(),
                'per_page' => $paginator->perPage(),
                'total' => $paginator->total(),
                'last_page' => $paginator->lastPage(),
            ],
        ]);
    }

    /** @return array<string, mixed> */
    private function row(RiskPool $pool): array
    {
        $cap = (int) $pool->total_cap_amount;
        $locked = (int) $pool->locked_amount;

        return [
            'normalized_number' => $pool->normalized_number,
            'total_cap_amount' => $cap,
            'locked_amount' => $locked,
            'remaining_amount' => (int) $pool->remaining_amount,
            'sold_out_status' => (int) $pool->sold_out_status,
            'is_sold_out' => (int) $pool->sold_out_status === 1,
            'usage_ratio' => $cap > 0 ? round($locked / $cap, 6) : null,
            'version' => (int) $pool->version,
        ];
    }
}