<?php

/**
 * 文件功能：商店业务逻辑服务层
 * 处理商品购买、周卡激活/覆盖、改名卡使用等全部核心业务
 */

namespace App\Services;

use App\Models\ShopItem;
use App\Models\User;
use App\Models\UsernameBlacklist;
use App\Models\UserPurchase;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\DB;

class ShopService
{
    /**
     * 购买商品入口：扣金币、按类型分发处理
     *
     * @return array{ok:bool, message:string, play_effect?:string}
     */
    public function buyItem(User $user, ShopItem $item): array
    {
        // 校验金币是否足够
        if ($user->jjb < $item->price) {
            return ['ok' => false, 'message' => "金币不足，购买 [{$item->name}] 需要 {$item->price} 金币，当前仅有 {$user->jjb} 金币。"];
        }

        return match ($item->type) {
            'instant' => $this->buyInstant($user, $item),
            'duration' => $this->buyWeekCard($user, $item),
            'one_time' => $this->buyRenameCard($user, $item),
            'ring' => $this->buyRing($user, $item),
            'auto_fishing' => $this->buyAutoFishingCard($user, $item),
            default => ['ok' => false, 'message' => '未知商品类型'],
        };
    }

    /**
     * 购买单次特效卡：立即扣金币，记录已用，返回需要播放的特效 key
     *
     * @return array{ok:bool, message:string, play_effect?:string}
     */
    public function buyInstant(User $user, ShopItem $item): array
    {
        DB::transaction(function () use ($user, $item) {
            // 扣除金币
            $user->decrement('jjb', $item->price);
            // 写入已使用记录（用于统计）
            UserPurchase::create([
                'user_id' => $user->id,
                'shop_item_id' => $item->id,
                'status' => 'used',
                'price_paid' => $item->price,
                'used_at' => Carbon::now(),
            ]);
        });

        return [
            'ok' => true,
            'message' => "购买成功！{$item->icon} {$item->name} 正在为您播放...",
            'play_effect' => $item->effectKey(), // 返回特效 key 让前端立即播放
        ];
    }

    /**
     * 购买周卡：取消旧周卡（金币不退），激活新周卡，有效期7天
     *
     * @return array{ok:bool, message:string}
     */
    public function buyWeekCard(User $user, ShopItem $item): array
    {
        DB::transaction(function () use ($user, $item) {
            // 将所有已激活的周卡标记为 cancelled（金币不退）
            UserPurchase::where('user_id', $user->id)
                ->where('status', 'active')
                ->whereHas('shopItem', fn ($q) => $q->where('type', 'duration'))
                ->update(['status' => 'cancelled']);

            // 扣除金币
            $user->decrement('jjb', $item->price);

            // 写入新的激活记录
            UserPurchase::create([
                'user_id' => $user->id,
                'shop_item_id' => $item->id,
                'status' => 'active',
                'price_paid' => $item->price,
                'expires_at' => Carbon::now()->addDays($item->duration_days ?? 7),
            ]);
        });

        return ['ok' => true, 'message' => "购买成功！{$item->icon} {$item->name} 已激活，下次登录自动生效（连续7天）。"];
    }

    /**
     * 购买改名卡：扣金币、写 active 记录备用
     *
     * @return array{ok:bool, message:string}
     */
    public function buyRenameCard(User $user, ShopItem $item): array
    {
        // 检查是否已有未使用的改名卡
        $existing = UserPurchase::where('user_id', $user->id)
            ->where('status', 'active')
            ->whereHas('shopItem', fn ($q) => $q->where('slug', 'rename_card'))
            ->exists();

        if ($existing) {
            return ['ok' => false, 'message' => '您已有一张未使用的改名卡，使用后再购买。'];
        }

        DB::transaction(function () use ($user, $item) {
            $user->decrement('jjb', $item->price);
            UserPurchase::create([
                'user_id' => $user->id,
                'shop_item_id' => $item->id,
                'status' => 'active',
                'price_paid' => $item->price,
            ]);
        });

        return ['ok' => true, 'message' => '改名卡购买成功！请在商店中使用改名卡修改昵称。'];
    }

    /**
     * 使用改名卡：校验新名、加黑名单、更新用户名
     *
     * @param  string  $newName  新昵称
     * @return array{ok:bool, message:string}
     */
    public function useRenameCard(User $user, string $newName): array
    {
        $newName = trim($newName);

        // 格式校验：1-10字符，中英文数字下划线
        if (! preg_match('/^[\x{4e00}-\x{9fa5}a-zA-Z0-9_]{1,10}$/u', $newName)) {
            return ['ok' => false, 'message' => '新昵称格式不合法（1-10字，中英文/数字/下划线）。'];
        }

        // 不能与自己现有名相同
        if ($newName === $user->username) {
            return ['ok' => false, 'message' => '新昵称与当前昵称相同，请重新输入。'];
        }

        // 不能与其他用户重名
        if (User::where('username', $newName)->exists()) {
            return ['ok' => false, 'message' => '该昵称已被他人注册，请换一个。'];
        }

        // 不能在黑名单保留期内
        if (UsernameBlacklist::isReserved($newName)) {
            return ['ok' => false, 'message' => '该昵称处于保护期，暂时无法使用。'];
        }

        // 查找有效的改名卡记录
        $purchase = UserPurchase::where('user_id', $user->id)
            ->where('status', 'active')
            ->whereHas('shopItem', fn ($q) => $q->where('slug', 'rename_card'))
            ->first();

        if (! $purchase) {
            return ['ok' => false, 'message' => '您没有可用的改名卡，请先购买。'];
        }

        DB::transaction(function () use ($user, $purchase, $newName) {
            $oldName = $user->username;

            // 修改用户名
            $user->username = $newName;
            $user->save();

            // 旧名入黑名单（保留30天）
            UsernameBlacklist::updateOrCreate(
                ['username' => $oldName],
                ['reserved_until' => Carbon::now()->addDays(30), 'created_at' => Carbon::now()]
            );

            // 标记改名卡为已使用
            $purchase->update(['status' => 'used', 'used_at' => Carbon::now()]);
        });

        return ['ok' => true, 'message' => "改名成功！您的新昵称为【{$newName}】，旧昵称将保留30天黑名单。注意：历史消息中的旧名不会同步修改。"];
    }

    /**
     * 获取用户当前激活的周卡特效 key（如 fireworks/rain/lightning/snow）
     * 过期的周卡会自动标记为 expired
     */
    public function getActiveWeekEffect(User $user): ?string
    {
        $purchase = UserPurchase::with('shopItem')
            ->where('user_id', $user->id)
            ->where('status', 'active')
            ->whereHas('shopItem', fn ($q) => $q->where('type', 'duration'))
            ->first();

        if (! $purchase) {
            return null;
        }

        // 检查是否过期
        if ($purchase->expires_at && $purchase->expires_at->isPast()) {
            $purchase->update(['status' => 'expired']);

            return null;
        }

        return $purchase->shopItem->effectKey();
    }

    /**
     * 购买结婚戒指：扣金币、写入背包（active 状态，等待结婚时消耗）。
     *
     * @return array{ok:bool, message:string}
     */
    public function buyRing(User $user, ShopItem $item): array
    {
        DB::transaction(function () use ($user, $item): void {
            // 扣除金币
            $user->decrement('jjb', $item->price);
            // 写入背包（active = 未使用，求婚时变为 used_pending→used 或 lost）
            UserPurchase::create([
                'user_id' => $user->id,
                'shop_item_id' => $item->id,
                'status' => 'active',
                'price_paid' => $item->price,
            ]);
        });

        return [
            'ok' => true,
            'message' => "💍 {$item->name} 购买成功！已放入背包，可用于求婚。",
        ];
    }

    /**
     * 获取用户当前激活的改名卡（是否持有未用改名卡）
     */
    public function hasRenameCard(User $user): bool
    {
        return UserPurchase::where('user_id', $user->id)
            ->where('status', 'active')
            ->whereHas('shopItem', fn ($q) => $q->where('slug', 'rename_card'))
            ->exists();
    }

    /**
     * 购买自动钓鱼卡：手刺金币，写入 active 记录，到期时间 = 现在 + duration_minutes。
     *
     * @return array{ok:bool, message:string}
     */
    public function buyAutoFishingCard(User $user, ShopItem $item): array
    {
        $minutes = (int) $item->duration_minutes;
        if ($minutes <= 0) {
            return ['ok' => false, 'message' => '该钓鱼卡配置异常，请联系管理员。'];
        }

        DB::transaction(function () use ($user, $item, $minutes): void {
            // 手刺金币
            $user->decrement('jjb', $item->price);
            // 写入背包（active，刻起计时）
            UserPurchase::create([
                'user_id' => $user->id,
                'shop_item_id' => $item->id,
                'status' => 'active',
                'price_paid' => $item->price,
                'expires_at' => Carbon::now()->addMinutes($minutes),
            ]);
        });

        $hours = round($minutes / 60, 1);

        return [
            'ok' => true,
            'message' => "🎣 {$item->name}购买成功！{$hours}小时内鬼鱼自动收篼，尽情摆烂！",
        ];
    }

    /**
     * 获取用户当前有效的自动钓鱼卡剩余分钟数（没有则返回 0）
     */
    public function getActiveAutoFishingMinutesLeft(User $user): int
    {
        $purchase = UserPurchase::where('user_id', $user->id)
            ->where('status', 'active')
            ->whereNotNull('expires_at')
            ->whereHas('shopItem', fn ($q) => $q->where('type', 'auto_fishing'))
            ->where('expires_at', '>', Carbon::now())
            ->orderByDesc('expires_at') // 取最晚过期的
            ->first();

        if (! $purchase) {
            return 0;
        }

        return (int) Carbon::now()->diffInMinutes($purchase->expires_at, false);
    }
}