<?php

namespace App\Service\wx;

use App\BaseApp\BaseWxService;
use App\Models\business\ListItemModel;
use App\Models\business\ListModel;
use App\Models\business\PackageItemModel;
use App\Models\business\PackageModel;
use App\Service\business\PackageQuoteService;
use App\Service\business\PriceService;
use App\Service\business\SerialNoService;
use App\Service\common\MediaUrlService;
use Illuminate\Support\Facades\DB;

/**
 * 小程序套餐：热门/列表/详情免登录，一件加入清单要登录
 *
 * 应用没开套餐时列表直接空，避免关了开关首页还露出卡片。
 */
class WxPackageService extends BaseWxService
{
    protected bool $needLogin = false;

    private MediaUrlService $media;

    private PackageQuoteService $quote;

    private PriceService $price;

    public function __construct()
    {
        parent::__construct();
        $this->media = MediaUrlService::getInstance();
        $this->quote = PackageQuoteService::getInstance();
        $this->price = PriceService::getInstance();
    }

    /**
     * 首页热门
     */
    public function hot(): array
    {
        if (!$this->featureEnabled()) {
            return [];
        }
        $rows = PackageModel::where('deleted_at', 0)
            ->where('status', 0)
            ->where('is_hot', 1)
            ->orderBy('sort')
            ->orderBy('id', 'desc')
            ->get();
        return $this->mapCards($rows->toArray());
    }

    /**
     * 套餐 tab 列表；keyword / name 按名称、副标题模糊查
     */
    public function list(): array
    {
        if (!$this->featureEnabled()) {
            return [];
        }
        $page = max(1, (int) request()->get('page', 1));
        $pageSize = max(1, (int) request()->get('pageSize', 20));
        $keyword = trim((string) request()->get('keyword', request()->get('name', '')));
        $query = PackageModel::where('deleted_at', 0)->where('status', 0)->orderBy('sort')->orderBy('id', 'desc');
        if ($keyword !== '') {
            $query->where(function ($inner) use ($keyword) {
                $inner->where('name', 'like', '%' . $keyword . '%')
                    ->orWhere('subtitle', 'like', '%' . $keyword . '%');
            });
        }
        $total = (clone $query)->count();
        $rows = $query->forPage($page, $pageSize)->get()->toArray();
        return [
            'items' => $this->mapCards($rows),
            'total' => $total,
            'page' => $page,
            'pageSize' => $pageSize,
            'has_more' => ($page * $pageSize) < $total,
        ];
    }

    /**
     * 套餐详情（含搭配与价格）
     *
     * 带 p_user_id 时与商品详情同一套：代理商分享进来的普通用户继承倍率。
     */
    public function detail(int $id, int $shareUserId = 0): array
    {
        if ($shareUserId > 0) {
            $this->inheritAgentPrice($shareUserId);
        }
        if (!$this->featureEnabled()) {
            $this->utils->errorThrow('套餐功能未启用');
        }
        $info = PackageModel::with([
            'items' => fn ($query) => $query->where('deleted_at', 0)->orderBy('sort')->orderBy('id'),
            'items.catalogue',
            'items.priceSheet',
        ])->where('id', $id)->where('deleted_at', 0)->where('status', 0)->first();
        if (empty($info)) {
            $this->utils->errorThrow('套餐不存在或已下架');
        }
        $info = $info->toArray();
        $show = $this->canSeePrice();
        $multiplier = $this->priceMultiplier();
        $info['cover'] = $this->media->toPublic($info['cover'] ?? '');
        $info['item_count'] = count($info['items'] ?? []);
        foreach ($info['items'] as &$item) {
            $item['title'] = $item['catalogue']['title'] ?? '';
            $item['cover'] = $this->media->toPublic($item['catalogue']['cover'] ?? '');
            $item['specification'] = $item['price_sheet']['specification'] ?? '';
            $item['dimension'] = $item['price_sheet']['dimension'] ?? '';
            $unit = $this->quote->applyMultiplier((int) ($item['unit_price'] ?? 0), $multiplier);
            $item['unit_price'] = $unit;
            $item['unit_price_text'] = $show ? $this->price->centsToYuan($unit) : PriceService::MASK;
            $item['product'] = $item['catalogue'] ?? null;
        }
        unset($item);
        return $this->withWxAmounts($info, $show, $multiplier);
    }

    /**
     * 一件加入清单：记下套餐价/原价和每行快照，供以后补差价
     */
    public function toList(array $params): array
    {
        // 写操作必须登录，构造时 needLogin=false 是为了列表免鉴权
        if ($this->userId <= 0) {
            $this->utils->errorThrow('请先登录');
        }
        if (!$this->featureEnabled()) {
            $this->utils->errorThrow('套餐功能未启用');
        }
        $packageId = (int) ($params['package_id'] ?? 0);
        $detail = $this->detail($packageId);
        $items = $detail['items'] ?? [];
        if (empty($items)) {
            $this->utils->errorThrow('套餐还没有搭配商品');
        }

        $listId = (int) ($params['list_id'] ?? 0);
        $list = null;
        if ($listId > 0) {
            $list = ListModel::where('id', $listId)
                ->where('user_id', $this->userId)
                ->where('deleted_at', 0)
                ->first();
            if (empty($list)) {
                $this->utils->errorThrow('清单不存在');
            }
            $bound = (int) ($list['package_id'] ?? 0);
            if ($bound > 0 && $bound !== $packageId) {
                $this->utils->errorThrow('该清单已绑定其他套餐，请新建清单');
            }
        }

        // detail() 已经乘过用户倍率，这里直接快照，不能再乘一次
        $packageAmount = (int) ($detail['package_amount'] ?? 0);
        $originalAmount = (int) ($detail['original_amount'] ?? 0);

        $newListId = 0;
        DB::connection('business')->transaction(function () use (
            &$newListId, $list, $packageId, $packageAmount, $originalAmount, $items, $detail
        ) {
            $now = time();
            if (empty($list)) {
                $newListId = ListModel::insertGetId([
                    'list_no' => SerialNoService::getInstance()->generate(SerialNoService::PREFIX_LIST, 'list', 'list_no'),
                    'user_id' => $this->userId,
                    'name' => (string) ($detail['name'] ?? '套餐'),
                    'remark' => '',
                    'package_id' => $packageId,
                    'package_amount' => $packageAmount,
                    'original_amount' => $originalAmount,
                    'created_at' => $now,
                ]);
            } else {
                $newListId = (int) $list['id'];
                $update = ['updated_at' => $now];
                if ((int) ($list['package_id'] ?? 0) === 0) {
                    $update['package_id'] = $packageId;
                    $update['package_amount'] = $packageAmount;
                    $update['original_amount'] = $originalAmount;
                }
                ListModel::where('id', $newListId)->update($update);
            }

            foreach ($items as $item) {
                $catalogueId = (int) ($item['catalogue_id'] ?? 0);
                $sheetId = (int) ($item['price_sheet_id'] ?? 0);
                $qty = max(1, (int) ($item['quantity'] ?? 1));
                $unit = (int) ($item['unit_price'] ?? 0);
                $exists = ListItemModel::where('list_id', $newListId)
                    ->where('catalogue_id', $catalogueId)
                    ->where('price_sheet_id', $sheetId)
                    ->where('deleted_at', 0)
                    ->first();
                if (!empty($exists)) {
                    ListItemModel::where('id', $exists['id'])->update([
                        'quantity' => (int) $exists['quantity'] + $qty,
                        'unit_price' => $unit,
                        'package_item_id' => (int) ($item['id'] ?? 0),
                        'updated_at' => $now,
                    ]);
                    continue;
                }
                ListItemModel::insert([
                    'list_id' => $newListId,
                    'catalogue_id' => $catalogueId,
                    'price_sheet_id' => $sheetId,
                    'material_key' => (string) ($item['material_key'] ?? 'routine'),
                    'quantity' => $qty,
                    'unit_price' => $unit,
                    'package_item_id' => (int) ($item['id'] ?? 0),
                    'snapshot_unit_price' => $unit,
                    'snapshot_quantity' => $qty,
                    'remark' => (string) ($item['remark'] ?? ''),
                    'created_at' => $now,
                ]);
            }
        });

        return ['list_id' => $newListId];
    }

    /**
     * 当前品牌是否打开套餐
     */
    public function featureEnabled(): bool
    {
        return WxAppService::getInstance()->packageEnabled();
    }

    /**
     * 卡片列表：封面、件数、有价权才带价格
     */
    private function mapCards(array $rows): array
    {
        $ids = array_column($rows, 'id');
        $counts = PackageItemModel::whereIn('package_id', $ids)
            ->where('deleted_at', 0)
            ->selectRaw('package_id, count(*) as total')
            ->groupBy('package_id')
            ->get()
            ->keyBy('package_id');
        $show = $this->canSeePrice();
        $multiplier = $this->priceMultiplier();
        foreach ($rows as &$row) {
            $row['cover'] = $this->media->toPublic($row['cover'] ?? '');
            $row['item_count'] = (int) ($counts[$row['id']]['total'] ?? 0);
            $row = $this->withWxAmounts($row, $show, $multiplier);
            unset($row['remark']);
        }
        unset($row);
        return $rows;
    }

    /**
     * 把基准价乘倍率，并按价权决定是否打码
     */
    private function withWxAmounts(array $row, bool $show, mixed $multiplier): array
    {
        $original = $this->quote->applyMultiplier((int) ($row['original_amount'] ?? 0), $multiplier);
        $package = $this->quote->applyMultiplier((int) ($row['package_amount'] ?? 0), $multiplier);
        $row['original_amount'] = $original;
        $row['package_amount'] = $package;
        $row['discount_amount'] = max(0, $original - $package);
        $row['is_show_price'] = $show;
        return $this->quote->withText($row, $show);
    }
}