<?php

declare(strict_types=1);

namespace app\miniapi\service;

use app\miniapi\http\Fields;
use app\miniapi\http\Pagination;
use app\miniapi\exception\ApiException;
use plugin\saiadmin\app\model\water\WaterPackage;
use plugin\saiadmin\app\model\water\WaterSku;

final class Catalog
{
    public function query()
    {
        return WaterPackage::query()->with('sku')->where('status', 1)->whereIn('sku_id', WaterSku::query()->where('status', 1)->select('id'));
    }

    public function present($package): array
    {
        $sku = $package->sku;

        return [
            'id' => (int) $package->id,
            'name' => $package->name,
            'sku_id' => (int) $package->sku_id,
            'sku_name' => $sku?->name,
            'liters' => $sku ? (float) $sku->liters : null,
            'buckets' => (int) $package->buckets,
            'price_cents' => (int) $package->price_cents,
            'unit_price_cents' => (int) round($package->price_cents / max(1, $package->buckets)),
            'category' => null,
            'valid_months' => null,
            'includes_device' => null,
        ];
    }

    public function listing(array $input): array
    {
        $page = new Pagination($input);
        $query = $this->query();
        $keyword = Fields::text($input, 'keyword', 120, false);
        Fields::choice($input, 'category', ['all'], 'all');
        if ($keyword !== '') {
            $query->where('name', 'like', '%' . $keyword . '%');
        }
        $total = (clone $query)->count();

        return $page->result($query->orderByDesc('id')->offset($page->offset())->limit($page->pageSize)->get()->map($this->present(...))->all(), $total)
            + [
                'categories' => [[
                    'value' => 'all',
                    'label' => '全部',
                ]],
                'capabilities' => ['category_filter' => false],
            ];
    }

    public function detail(int $id): array
    {
        $package = $this->query()->find($id);
        if (!$package) {
            throw new ApiException(40401, '套餐不存在或已下架', 404);
        }

        return $this->present($package);
    }

    /** Lock the complete set before SKU rows, so creating a checkout has one coherent snapshot. */
    public function lockedDetails(array $ids): array
    {
        $packages = WaterPackage::query()->whereIn('id', $ids)->orderBy('id')->lockForUpdate()->get();
        $skus = WaterSku::query()->whereIn('id', $packages->pluck('sku_id')->unique()->all())
            ->orderBy('id')->lockForUpdate()->get()->keyBy('id');
        $result = [];
        foreach ($packages as $package) {
            $sku = $skus->get($package->sku_id);
            if ((int) $package->status !== 1 || !$sku || (int) $sku->status !== 1) {
                throw new ApiException(40401, '套餐不存在或已下架', 404);
            }
            $package->setRelation('sku', $sku);
            $result[(int) $package->id] = $this->present($package);
        }
        if (count($result) !== count($ids)) {
            throw new ApiException(40401, '套餐不存在或已下架', 404);
        }

        return $result;
    }
}