<?php

/**
 * 文件功能：后台 VIP 会员等级管理控制器
 * 提供会员等级的 CRUD（增删改查）功能
 * 后台可自由创建、修改、删除会员等级
 *
 * @author   ChatRoom Laravel
 *
 * @version  1.0.0
 */

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\VipLevel;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\View\View;

class VipController extends Controller
{
    /**
     * 会员等级管理列表页
     */
    public function index(): View
    {
        $levels = VipLevel::orderBy('sort_order')->get();

        return view('admin.vip.index', compact('levels'));
    }

    /**
     * 新增会员等级
     */
    public function store(Request $request): RedirectResponse
    {
        $data = $request->validate([
            'name' => 'required|string|max:50',
            'icon' => 'required|string|max:20',
            'color' => 'required|string|max:10',
            'exp_multiplier' => 'required|numeric|min:1|max:99',
            'jjb_multiplier' => 'required|numeric|min:1|max:99',
            'sort_order' => 'required|integer|min:0',
            'price' => 'required|integer|min:0',
            'duration_days' => 'required|integer|min:0',
            'join_templates' => 'nullable|string',
            'leave_templates' => 'nullable|string',
        ]);

        // 将文本框的多行模板转为 JSON 数组
        $data['join_templates'] = $this->textToJson($data['join_templates'] ?? '');
        $data['leave_templates'] = $this->textToJson($data['leave_templates'] ?? '');

        VipLevel::create($data);

        return redirect()->route('admin.vip.index')->with('success', '会员等级创建成功！');
    }

    /**
     * 更新会员等级
     *
     * @param  int  $id  等级ID
     */
    public function update(Request $request, int $id): RedirectResponse
    {
        $level = VipLevel::findOrFail($id);

        $data = $request->validate([
            'name' => 'required|string|max:50',
            'icon' => 'required|string|max:20',
            'color' => 'required|string|max:10',
            'exp_multiplier' => 'required|numeric|min:1|max:99',
            'jjb_multiplier' => 'required|numeric|min:1|max:99',
            'sort_order' => 'required|integer|min:0',
            'price' => 'required|integer|min:0',
            'duration_days' => 'required|integer|min:0',
            'join_templates' => 'nullable|string',
            'leave_templates' => 'nullable|string',
        ]);

        $data['join_templates'] = $this->textToJson($data['join_templates'] ?? '');
        $data['leave_templates'] = $this->textToJson($data['leave_templates'] ?? '');

        $level->update($data);

        return redirect()->route('admin.vip.index')->with('success', '会员等级更新成功！');
    }

    /**
     * 删除会员等级（关联用户的 vip_level_id 会自动置 null）
     *
     * @param  int  $id  等级ID
     */
    public function destroy(int $id): RedirectResponse
    {
        $level = VipLevel::findOrFail($id);
        $level->delete();

        return redirect()->route('admin.vip.index')->with('success', '会员等级已删除！');
    }

    /**
     * 将多行文本转为 JSON 数组字符串
     * 每行一个模板，空行忽略
     *
     * @param  string  $text  多行文本
     * @return string|null JSON 字符串
     */
    private function textToJson(string $text): ?string
    {
        $lines = array_filter(
            array_map('trim', explode("\n", $text)),
            fn ($line) => $line !== ''
        );

        if (empty($lines)) {
            return null;
        }

        return json_encode(array_values($lines), JSON_UNESCAPED_UNICODE);
    }
}