<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class AITaskRequest 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.
     *
     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array<mixed>|string>
     */
    public function rules(): array
    {
        $allowedTasks = [
            'data_analysis',
            'report_generation',
            'prediction',
            'recommendation',
            'document_summary',
        ];

        return [
            'task' => 'required|string|in:' . implode(',', $allowedTasks),
            'parameters' => 'required|array',
            'parameters.type' => 'nullable|string|max:50',
            'parameters.period' => 'nullable|string|max:50',
            'parameters.report_type' => 'nullable|string|max:50',
            'parameters.start_date' => 'nullable|date',
            'parameters.end_date' => 'nullable|date',
            'parameters.target' => 'nullable|string|max:50',
            'parameters.periods' => 'nullable|integer|min:1|max:12',
            'parameters.area' => 'nullable|string|max:50',
            'parameters.content' => 'nullable|string|max:10000',
            'parameters.max_length' => 'nullable|integer|min:50|max:1000',
        ];
    }

    /**
     * Get custom messages for validator errors.
     */
    public function messages(): array
    {
        return [
            'task.required' => '任务类型不能为空',
            'task.in' => '不支持的任务类型',
            'parameters.required' => '任务参数不能为空',
            'parameters.array' => '任务参数必须是数组格式',
            'parameters.type.max' => '分析类型最多50个字符',
            'parameters.period.max' => '分析周期最多50个字符',
            'parameters.report_type.max' => '报告类型最多50个字符',
            'parameters.start_date.date' => '开始日期格式不正确',
            'parameters.end_date.date' => '结束日期格式不正确',
            'parameters.target.max' => '预测目标最多50个字符',
            'parameters.periods.min' => '预测期数至少1期',
            'parameters.periods.max' => '预测期数最多12期',
            'parameters.area.max' => '建议领域最多50个字符',
            'parameters.content.max' => '文档内容最多10000个字符',
            'parameters.max_length.min' => '摘要长度至少50个字符',
            'parameters.max_length.max' => '摘要长度最多1000个字符',
        ];
    }

    /**
     * Prepare the data for validation.
     */
    protected function prepareForValidation()
    {
        // 确保parameters是数组
        if ($this->has('parameters') && !is_array($this->parameters)) {
            $this->merge([
                'parameters' => [],
            ]);
        }
    }

    /**
     * Get validated data with defaults.
     */
    public function validatedData(): array
    {
        $validated = parent::validated();
        
        // 设置默认值
        if (!isset($validated['parameters'])) {
            $validated['parameters'] = [];
        }
        
        // 根据任务类型设置默认参数
        switch ($validated['task']) {
            case 'data_analysis':
                if (!isset($validated['parameters']['type'])) {
                    $validated['parameters']['type'] = 'sales';
                }
                if (!isset($validated['parameters']['period'])) {
                    $validated['parameters']['period'] = 'month';
                }
                break;
                
            case 'report_generation':
                if (!isset($validated['parameters']['report_type'])) {
                    $validated['parameters']['report_type'] = 'sales';
                }
                break;
                
            case 'prediction':
                if (!isset($validated['parameters']['target'])) {
                    $validated['parameters']['target'] = 'sales';
                }
                if (!isset($validated['parameters']['periods'])) {
                    $validated['parameters']['periods'] = 3;
                }
                break;
                
            case 'recommendation':
                if (!isset($validated['parameters']['area'])) {
                    $validated['parameters']['area'] = 'inventory';
                }
                break;
                
            case 'document_summary':
                if (!isset($validated['parameters']['max_length'])) {
                    $validated['parameters']['max_length'] = 200;
                }
                break;
        }
        
        return $validated;
    }
}