<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;
use Shared\Models\Products\BomConditionRule;

class BomConditionRuleRequest 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 [
            'model_id' => 'required|integer|exists:models,id',
            'name' => 'required|string|max:100',
            'condition_expression' => 'required|string|max:1000',
            'action' => 'required|string|in:' . implode(',', BomConditionRule::ACTIONS),
            'target_items' => 'required|array|min:1',
            'target_items.*.product_id' => 'nullable|integer|exists:products,id',
            'target_items.*.material_id' => 'nullable|integer|exists:materials,id',
            'target_items.*.quantity' => 'nullable|numeric|min:0',
            'target_items.*.waste_rate' => 'nullable|numeric|min:0|max:100',
            'target_items.*.unit' => 'nullable|string|max:20',
            'target_items.*.memo' => 'nullable|string|max:200',
            'priority' => 'nullable|integer|min:1',
            'description' => 'nullable|string|max:500',
            'is_active' => 'boolean',
        ];
    }

    /**
     * Get custom messages for validator errors.
     */
    public function messages(): array
    {
        return [
            'condition_expression.required' => __('error.condition_expression_required'),
            'target_items.required' => __('error.target_items_required'),
            'target_items.min' => __('error.target_items_required'),
            'target_items.*.quantity.min' => __('error.quantity_must_be_positive'),
            'target_items.*.waste_rate.max' => __('error.waste_rate_too_high'),
        ];
    }

    /**
     * Configure the validator instance.
     */
    public function withValidator($validator): void
    {
        $validator->after(function ($validator) {
            $this->validateRuleNameUnique($validator);
            $this->validateConditionExpression($validator);
            $this->validateTargetItems($validator);
        });
    }

    /**
     * 규칙명 중복 검증
     */
    private function validateRuleNameUnique($validator): void
    {
        if (!$this->input('model_id') || !$this->input('name')) {
            return;
        }

        $query = BomConditionRule::where('model_id', $this->input('model_id'))
            ->where('name', $this->input('name'));

        // 수정 시 자기 자신 제외
        if ($this->route('id')) {
            $query->where('id', '!=', $this->route('id'));
        }

        if ($query->exists()) {
            $validator->errors()->add('name', __('error.rule_name_duplicate'));
        }
    }

    /**
     * 조건식 검증
     */
    private function validateConditionExpression($validator): void
    {
        if (!$this->input('condition_expression')) {
            return;
        }

        $tempRule = new BomConditionRule([
            'condition_expression' => $this->input('condition_expression'),
            'model_id' => $this->input('model_id'),
        ]);

        $conditionErrors = $tempRule->validateConditionExpression();

        if (!empty($conditionErrors)) {
            foreach ($conditionErrors as $error) {
                $validator->errors()->add('condition_expression', $error);
            }
        }
    }

    /**
     * 대상 아이템 검증
     */
    private function validateTargetItems($validator): void
    {
        $targetItems = $this->input('target_items', []);
        $action = $this->input('action');

        foreach ($targetItems as $index => $item) {
            // 제품 또는 자재 참조 필수
            if (empty($item['product_id']) && empty($item['material_id'])) {
                $validator->errors()->add(
                    "target_items.{$index}",
                    __('error.target_item_missing_reference')
                );
            }

            // 제품과 자재 동시 참조 불가
            if (!empty($item['product_id']) && !empty($item['material_id'])) {
                $validator->errors()->add(
                    "target_items.{$index}",
                    __('error.target_item_multiple_reference')
                );
            }

            // REPLACE 액션의 경우 replace_from 필수
            if ($action === BomConditionRule::ACTION_REPLACE && empty($item['replace_from'])) {
                $validator->errors()->add(
                    "target_items.{$index}.replace_from",
                    __('error.replace_from_required')
                );
            }

            // replace_from 검증
            if (!empty($item['replace_from'])) {
                if (empty($item['replace_from']['product_id']) && empty($item['replace_from']['material_id'])) {
                    $validator->errors()->add(
                        "target_items.{$index}.replace_from",
                        __('error.replace_from_missing_reference')
                    );
                }
            }
        }
    }

    /**
     * Prepare the data for validation.
     */
    protected function prepareForValidation(): void
    {
        // JSON 문자열인 경우 배열로 변환
        if ($this->has('target_items') && is_string($this->input('target_items'))) {
            $this->merge([
                'target_items' => json_decode($this->input('target_items'), true) ?? []
            ]);
        }
    }
}