<?php

namespace App\Http\Requests;

use App\Models\StudyAsk;
use App\Models\Study;
use Illuminate\Foundation\Http\FormRequest;

class StudyAskRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     */
    public function authorize(): bool
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     */
    public function rules(): array
    {
        return [
            'study_id' => 'required|exists:studies,id',
            'title' => 'required|string|max:500',
            'type' => 'required|in:1,2',
            'answer' => 'required|array|min:2',
            'answer.*.content' => 'required|string|max:200',
            'answer.*.result' => 'required|in:0,1',
        ];
    }

    /**
     * Get custom messages for validator errors.
     */
    public function messages(): array
    {
        return [
            'study_id.required' => __('validation.required', ['attribute' => __('study_ask.study_id')]),
            'study_id.exists' => __('validation.exists', ['attribute' => __('study_ask.study_id')]),
            'title.required' => __('validation.required', ['attribute' => __('study_ask.title')]),
            'title.max' => __('validation.max.string', ['attribute' => __('study_ask.title'), 'max' => 500]),
            'type.required' => __('validation.required', ['attribute' => __('study_ask.type')]),
            'type.in' => __('validation.in', ['attribute' => __('study_ask.type')]),
            'answer.required' => __('validation.required', ['attribute' => __('study_ask.answer')]),
            'answer.array' => __('validation.array', ['attribute' => __('study_ask.answer')]),
            'answer.min' => __('validation.min.array', ['attribute' => __('study_ask.answer'), 'min' => 2]),
            'answer.*.content.required' => __('validation.required', ['attribute' => __('study_ask.answer_content')]),
            'answer.*.content.max' => __('validation.max.string', ['attribute' => __('study_ask.answer_content'), 'max' => 200]),
            'answer.*.result.required' => __('validation.required', ['attribute' => __('study_ask.answer_result')]),
            'answer.*.result.in' => __('validation.in', ['attribute' => __('study_ask.answer_result')]),
        ];
    }

    /**
     * Configure the validator instance.
     */
    public function withValidator($validator): void
    {
        $validator->after(function ($validator) {
            // 检查学习内容是否存在
            if ($this->has('study_id')) {
                $study = Study::find($this->input('study_id'));
                if (!$study) {
                    $validator->errors()->add('study_id', __('study.not_found'));
                }
            }

            // 检查答案选项
            if ($this->has('answer')) {
                $answers = $this->input('answer');
                $correctCount = 0;

                foreach ($answers as $index => $answer) {
                    if (isset($answer['result']) && $answer['result'] == 1) {
                        $correctCount++;
                    }
                }

                // 检查是否有正确答案
                if ($correctCount == 0) {
                    $validator->errors()->add('answer', __('study_ask.no_correct_answer'));
                }

                // 检查单选题是否只有一个正确答案
                if ($this->input('type') == StudyAsk::TYPE_SINGLE && $correctCount > 1) {
                    $validator->errors()->add('answer', __('study_ask.single_choice_multiple_correct'));
                }

                // 检查多选题是否至少有一个正确答案
                if ($this->input('type') == StudyAsk::TYPE_MULTIPLE && $correctCount < 1) {
                    $validator->errors()->add('answer', __('study_ask.multiple_choice_no_correct'));
                }
            }
        });
    }
}