<?php

namespace App\Forms;

use App\Exceptions\FormValidationException;
use RuntimeException;

/**
 * CommonForm
 * - 모든 Form의 공통 베이스
 * - 핵심 개선점:
 *   1) FK/숫자 필드 미입력('')을 NULL로 정규화 ('' -> null)
 *   2) 전역 null -> '' 변환 제거 (FK/숫자/날짜 타입 깨짐 방지)
 *   3) validate()에서 dynamicRules 누적 버그 수정 (마지막 규칙만 남는 문제 해결)
 *   4) "필드 존재 보장"으로 임의 '' 삽입 제거 (미입력 필드가 FK/숫자 규칙을 깨는 문제 방지)
 *   5) role.* 같은 배열 원소 규칙을 위해 부모 배열 보정 로직 유지/강화
 *
 * ✅ 추가:
 *   - validate() 실패 시 RuntimeException(implode) 대신
 *     FormValidationException(errors 배열)을 throw하여
 *     Controller에서 AJAX(422 JSON errors) 응답이 가능하게 함
 */
abstract class CommonForm
{
  private array $_attributes = [];
  private array $_formFields = [];
  private array $_formRules = [];
  private array $_formFilters = [];
  private array $_indexFilters = [];
  private array $_batchjobFilters = [];
  private array $_formOptions = [];
  private array $_actionButtons = ['view' => ICONS['SEARCH'], 'delete' => ICONS['DELETE']];
  private array $_batchjobButtons = ['batchjob' => '일괄처리', 'batchjob_delete' => '일괄삭제'];
  protected $validation = null;

  protected function __construct()
  {
    $this->validation = service('validation');
  }

  public function action_init_process(string $action, array &$formDatas = []): void
  {
    $actionButtons = ['view' => ICONS['SEARCH'], 'delete' => ICONS['DELETE']];
    $batchjobButtons = [];
    $this->setActionButtons($actionButtons);
    $this->setBatchjobButtons($batchjobButtons);
  }

  final public function setAttributes(array $attributes): void
  {
    $this->_attributes = $attributes;
  }

  final public function getAttribute(string $key): string
  {
    if (!array_key_exists($key, $this->_attributes)) {
      throw new RuntimeException(static::class . '->' . __FUNCTION__ . "에서 오류발생: {$key}에 해당하는 속성이 정의되지 않았습니다.");
    }
    return $this->_attributes[$key];
  }

  final public function setFormFields(array $fields): void
  {
    foreach ($fields as $field) {
      $this->_formFields[$field] = $this->getFormFieldLabel($field);
    }
  }

  // $fields 매치된것만 반환, []->전체
  final public function getFormFields(array $fields = []): array
  {
    if (empty($fields)) {
      return $this->_formFields;
    }
    return array_intersect_key($this->_formFields, array_flip($fields));
  }

  public function setFormRules(string $action, array $fields, $formRules = []): void
  {
    foreach ($fields as $field) {
      $formRules = $this->getFormRule($action, $field, $formRules);
    }
    $this->_formRules = $formRules;
  }

  final public function getFormRules(array $fields = []): array
  {
    if (empty($fields)) {
      return $this->_formRules;
    }
    return array_intersect_key($this->_formRules, array_flip($fields));
  }

  final public function setFormOptions(string $action, array $fields, array $formDatas = [], $formOptions = []): void
  {
    foreach ($fields as $field) {
      $formOptions[$field] = $formOptions[$field] ?? $this->getFormOption($action, $field, $formDatas);
    }
    $this->_formOptions = $formOptions;
  }

  // $fields 매치된것만 반환, []->전체
  final public function getFormOptions(array $fields = []): array
  {
    if (empty($fields)) {
      return $this->_formOptions;
    }
    return array_intersect_key($this->_formOptions, array_flip($fields));
  }

  final public function setFormFilters(array $fields): void
  {
    $this->_formFilters = $fields;
  }

  final public function getFormFilters(): array
  {
    return $this->_formFilters;
  }

  final public function setIndexFilters(array $fields): void
  {
    $this->_indexFilters = $fields;
  }

  final public function getIndexFilters(): array
  {
    return $this->_indexFilters;
  }

  final public function setBatchjobFilters(array $fields): void
  {
    $this->_batchjobFilters = $fields;
  }

  final public function getBatchjobFilters(): array
  {
    return $this->_batchjobFilters;
  }

  final public function setActionButtons(array $buttons): array
  {
    return $this->_actionButtons = $buttons;
  }

  final public function getActionButtons(): array
  {
    return $this->_actionButtons;
  }

  final public function setBatchjobButtons(array $buttons): array
  {
    return $this->_batchjobButtons = $buttons;
  }

  final public function getBatchjobButtons(): array
  {
    return $this->_batchjobButtons;
  }

  /* ---------------------------------------------------------------------
   * Validation
   * --------------------------------------------------------------------- */

  /**
   * 데이터를 검증하고 유효하지 않을 경우 예외를 발생시킵니다.
   * ✅ 변경점:
   *   - 실패 시 FormValidationException(errors 배열)을 throw
   *     (AJAX에서 422로 내려보내기 위함)
   */
  final public function validate(string $action, array &$formDatas): void
  {
    try {
      // 1) 전체 룰/필드
      $allFormFields = $this->getFormFields();
      $allFormRules = $this->getFormRules();

      if (empty($allFormRules)) {
        throw new RuntimeException(static::class . '->' . __FUNCTION__ . "에서 오류발생: 지정된 Form RULE이 없습니다.");
      }

      // 2) 검증 대상 필드 결정
      // - create 계열: 전체 룰
      // - modify 계열: 전달받은 formDatas 키에 해당하는 룰만
      $targetFields = [];

      if (in_array($action, ['modify', 'modify_form'], true)) {
        // 전달받은 필드만 검증
        $targetFields = array_keys($formDatas);

        // 검증 대상에서 제외할 내부/제어용 키(프로젝트에 맞게 추가/삭제)
        $exclude = ['_method', 'csrf_test_name', 'submit', 'token'];
        $targetFields = array_values(array_diff($targetFields, $exclude));

        // role.* 같은 규칙이 있을 수 있으니 "부모 배열" 보정
        // - formRules에 role.*가 존재하고
        // - formDatas에 role(배열)이 있다면
        //   label/ruleset 구성 안정성을 위해 parent도 targetFields에 포함
        foreach ($allFormRules as $ruleField => $_ruleStr) {
          $ruleField = (string) $ruleField;
          if (str_contains($ruleField, '.*')) {
            $parent = str_replace('.*', '', $ruleField);
            if (array_key_exists($parent, $formDatas) && !in_array($parent, $targetFields, true)) {
              $targetFields[] = $parent;
            }
          }
        }

        // 실제 정의된 룰이 있는 필드만 남김
        $targetFields = array_values(array_intersect($targetFields, array_keys($allFormRules)));
      } else {
        // create/create_form/alternative_create_form 등은 전체 룰 검증
        $targetFields = array_keys($allFormRules);
      }

      // 3) 대상 필드의 rules/fields만 취득
      $formFields = $this->getFormFields($targetFields);
      $formRules = $this->getFormRules($targetFields);

      if (empty($formRules)) {
        throw new RuntimeException(static::class . '->' . __FUNCTION__ . "에서 오류발생: 검증할 대상 RULE이 없습니다.");
      }

      // 4) dynamic ruleset 생성
      $dynamicRules = [];
      foreach ($formRules as $field => $rule) {
        [$fieldName, $ruleStr] = $this->getValidationRule((string) $field, (string) $rule);

        if (isset($formFields[$fieldName])) {
          $label = $formFields[$fieldName];
        } elseif (str_contains($fieldName, '.*')) {
          $parentField = str_replace('.*', '', $fieldName);
          $label = ($formFields[$parentField] ?? $fieldName) . ' 항목';
        } else {
          $label = $fieldName;
        }

        $dynamicRules[$fieldName] = [
          'label' => $label,
          'rules' => $ruleStr,
        ];
      }

      // 5) run
      $this->validation->setRules($dynamicRules);
      if (!$this->validation->run($formDatas)) {
        throw new FormValidationException($this->validation->getErrors());
      }

    } catch (FormValidationException $e) {
      throw $e;
    } catch (\TypeError $e) {
      throw new RuntimeException('검증 도중 타입 오류 발생: ' . $e->getMessage());
    } catch (\Throwable $e) {
      throw new RuntimeException('유효성 검사 중 시스템 오류 발생: ' . $e->getMessage());
    }
  }


  /* ---------------------------------------------------------------------
   * Overridable hooks
   * --------------------------------------------------------------------- */

  protected function getValidationRule(string $field, string $rule): array
  {
    return [$field, $rule];
  }

  public function getFormFieldLabel(string $field, ?string $label = null): string
  {
    switch ($field) {
      default:
        $label = $label ?? lang("{$this->getAttribute('class_path')}.label.{$field}");
        break;
    }
    return $label;
  }

  public function getFormRule(string $action, string $field, array $formRules): array
  {
    switch ($field) {
      case $this->getAttribute('pk_field'):
        if (!$this->getAttribute('useAutoIncrement')) {
          $formRules[$field] = sprintf(
            "required|regex_match[/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/]%s",
            in_array($action, ["create"]) ? "|is_unique[{$this->getAttribute('table')}.{$field}]" : ""
          );
        } else {
          $formRules[$field] = "required|numeric";
        }
        break;

      case $this->getAttribute('title_field'):
        $formRules[$field] = sprintf(
          "required|trim|string%s",
          in_array($action, ["create", "create_form"]) ? "|is_unique[{$this->getAttribute('table')}.{$field}]" : ""
        );
        break;

      case "code":
        $formRules[$field] = sprintf(
          "required|regex_match[/^[a-zA-Z0-9가-힣\-\_]+$/]|min_length[4]%s",
          in_array($action, ["create"]) ? "|is_unique[{$this->getAttribute('table')}.{$field}]" : ""
        );
        break;

      case "user_uid":
        $formRules[$field] = "required|numeric";
        break;

      case "status":
        $formRules[$field] = "required|trim|string";
        break;

      case 'picture':
        $formRules[$field] = "is_image[{$field}]|mime_in[{$field},image/jpg,image/jpeg,image/gif,image/png,image/webp]|max_size[{$field},300]|max_dims[{$field},2048,768]";
        break;

      case "updated_at":
      case "created_at":
      case "deleted_at":
        $formRules[$field] = "permit_empty|trim|valid_date";
        break;

      default:
        $formRules[$field] = "permit_empty|trim|string";
        break;
    }

    return $formRules;
  }

  /* ---------------------------------------------------------------------
   * Options
   * --------------------------------------------------------------------- */

  protected function getFormOption_process($service, string $action, string $field, array $formDatas = []): array
  {
    $entities = [];

    switch ($field) {
      default:
        if (in_array($action, ['create_form', 'modify_form', 'alternative_create_form'])) {
          if (array_key_exists($field, $formDatas)) {
            $where = sprintf("status = '%s' OR %s='%s'", STATUS['AVAILABLE'], $this->getAttribute('pk_field'), $formDatas[$field]);
          } else {
            $where = sprintf("status = '%s'", STATUS['AVAILABLE']);
          }
          $entities = $service->getEntities([$where => null]);
        } else {
          $entities = $service->getEntities();
        }
        break;
    }

    return $entities;
  }

  public function getFormOption(string $action, string $field, array $formDatas = [], array $options = ['options' => [], 'atttributes' => []]): array
  {
    $tempOptions = ['' => lang("{$this->getAttribute('class_path')}.label.{$field}") . " 선택"];

    switch ($field) {
      case 'user_uid':
        foreach ($this->getFormOption_process(service('userservice'), $action, $field, $formDatas) as $entity) {
          $tempOptions[$entity->getPK()] = $entity->getTitle();
        }
        $options['options'] = $tempOptions;
        break;

      case 'clientinfo_uid':
        foreach ($this->getFormOption_process(service('customer_clientservice'), $action, $field, $formDatas) as $entity) {
          $tempOptions[$entity->getPK()] = $entity->getCustomTitle();
        }
        $options['options'] = $tempOptions;
        break;

      default:
        $optionDatas = lang($this->getAttribute('class_path') . "." . strtoupper($field));
        if (!is_array($optionDatas)) {
          throw new RuntimeException(static::class . '->' . __FUNCTION__ . "에서 오류발생:{$field}가 배열값이 아닙니다.");
        }
        foreach ($optionDatas as $key => $label) {
          $tempOptions[$key] = $label;
        }
        $options['options'] = $tempOptions;
        break;
    }

    return $options;
  }
}