<?php

namespace App\Controllers;

use RuntimeException;
use App\Entities\CommonEntity;
use CodeIgniter\HTTP\RedirectResponse;
use CodeIgniter\HTTP\ResponseInterface;
use App\Exceptions\FormValidationException;

/**
 * AbstractCRUDController
 * 단일 레코드 생성(C), 조회(R), 수정(U), 삭제(D) 로직을 담당합니다. (SRP: Single Record Management)
 */
abstract class AbstractCRUDController extends AbstractWebController
{
  // --- 생성 (Create) ---
  protected function create_form_process(array $formDatas = []): array
  {
    //초기 기본 Default값 지정
    $formDatas = $this->request->getVar();
    return $formDatas;
  }

  protected function create_form_result_process(string $action): string|RedirectResponse
  {
    return $this->action_render_process($action, $this->getViewDatas(), $this->request->getVar('ActionTemplate'));
  }

  public function create_form(): string|RedirectResponse
  {
    try {
      $action = __FUNCTION__;
      $formDatas = $this->create_form_process();
      $this->action_init_process($action, $formDatas);
      $this->addViewDatas('formDatas', $formDatas);
      return $this->create_form_result_process($action);
    } catch (\Throwable $e) {
      return $this->action_redirect_process('error', static::class . '->' . __FUNCTION__ . "에서 {$this->getTitle()} 생성폼 오류:" . $e->getMessage());
    }
  }

  protected function create_process(array $formDatas): CommonEntity
  {
    // POST 데이터를 DTO 객체로 변환
    $dto = $this->service->createDTO($formDatas);

    //DTO 타입 체크 로직을 일반화
    $dtoClass = $this->service->getDTOClass();
    if (!$dto instanceof $dtoClass) {
      throw new RuntimeException(static::class . '->' . __FUNCTION__ . "에서 오류발생: " . get_class($dto) . "는 사용할 수 없습니다. ({$dtoClass} 필요)");
    }

    // 💡 여기서 service->create() 내부에서 CommonForm::validate()가 실행되고
    // 실패 시 FormValidationException이 throw 된다고 가정(권장)
    return $this->service->create($dto->toArray());
  }

  protected function create_result_process(CommonEntity $entity, ?string $redirect_url = null): string|RedirectResponse
  {
    return $this->action_redirect_process(
      'info',
      "{$this->getTitle()}에서 {$entity->getTitle()} 생성이 완료되었습니다.",
      $redirect_url ?? '/' . implode('/', [...$this->getActionPaths(), 'view']) . '/' . $entity->getPK()
    );
  }

  final public function create(): string|RedirectResponse|ResponseInterface
  {
    try {
      $action = __FUNCTION__;
      $this->action_init_process($action);

      $entity = $this->create_process($this->request->getPost());

      // 💡 동적으로 가져온 Entity 클래스 이름으로 instanceof 검사
      $entityClass = $this->service->getEntityClass();
      if (!$entity instanceof $entityClass) {
        throw new RuntimeException(static::class . '->' . __FUNCTION__ . "에서 오류발생:Return Type은 {$entityClass}만 가능");
      }

      // ✅ AJAX 요청이면 JSON 성공 응답
      if ($this->request->isAJAX()) {
        return $this->response->setJSON([
          'ok' => true,
          'message' => "{$this->getTitle()}에서 {$entity->getTitle()} 생성이 완료되었습니다.",
          'id' => $entity->getPK(),
        ]);
      }

      return $this->create_result_process($entity);

    } catch (FormValidationException $e) {

      // ✅ AJAX 요청이면 422 + 필드별 오류
      if ($this->request->isAJAX()) {
        return $this->response
          ->setStatusCode(422)
          ->setJSON([
            'ok' => false,
            'errors' => $e->errors,
          ]);
      }

      // 기존 redirect 방식 유지
      return $this->action_redirect_process(
        'error',
        static::class . '->' . __FUNCTION__ . "에서 {$this->getTitle()} 생성 오류:\n" . implode("\n", $e->errors)
      );

    } catch (\Throwable $e) {
      log_message('error', 'EXCEPTION_CLASS=' . get_class($e));
      // ✅ AJAX면 500 JSON
      if ($this->request->isAJAX()) {
        return $this->response
          ->setStatusCode(500)
          ->setJSON([
            'ok' => false,
            'message' => static::class . '->' . __FUNCTION__ . "에서 오류:" . $e->getMessage(),
          ]);
      }

      return $this->action_redirect_process('error', static::class . '->' . __FUNCTION__ . "에서 {$this->getTitle()} 생성 오류:" . $e->getMessage());
    }
  }

  // --- 수정 (Modify) ---
  protected function modify_form_process($uid): CommonEntity
  {
    return $this->service->getEntity($uid);
  }

  protected function modify_form_result_process(string $action): string|RedirectResponse
  {
    return $this->action_render_process($action, $this->getViewDatas(), $this->request->getVar('ActionTemplate'));
  }

  final public function modify_form($uid): string|RedirectResponse
  {
    try {
      if (!$uid) {
        throw new RuntimeException(static::class . '->' . __FUNCTION__ . "에서 {$this->getTitle()}에 번호가 정의 되지 않았습니다.");
      }
      $entity = $this->modify_form_process($uid);
      $this->addViewDatas('entity', $entity);
      $action = __FUNCTION__;
      $this->action_init_process($action, $entity->toArray());
      return $this->modify_form_result_process($action);
    } catch (\Throwable $e) {
      return $this->action_redirect_process('error', static::class . '->' . __FUNCTION__ . "에서 {$this->getTitle()} 수정폼 오류:" . $e->getMessage());
    }
  }

  protected function modify_process($uid, array $formDatas): CommonEntity
  {
    $formDatas[$this->service->getPKField()] = $uid;
    $dto = $this->service->createDTO($formDatas);
    //DTO 타입 체크 로직을 일반화
    $dtoClass = $this->service->getDTOClass();
    if (!$dto instanceof $dtoClass) {
      throw new RuntimeException(static::class . '->' . __FUNCTION__ . "에서 오류발생: " . get_class($dto) . "는 사용할 수 없습니다. ({$dtoClass} 필요)");
    }
    return $this->service->modify($uid, $dto->toArray());
  }

  final public function modify($uid): string|RedirectResponse|ResponseInterface
  {
    try {
      if (!$uid) {
        throw new RuntimeException(static::class . '->' . __FUNCTION__ . "에서 {$this->getTitle()}에 번호가 정의 되지 않았습니다.");
      }

      $action = __FUNCTION__;
      $this->action_init_process($action);

      $entity = $this->modify_process($uid, $this->request->getPost());

      // 💡 동적으로 가져온 Entity 클래스 이름으로 instanceof 검사
      $entityClass = $this->service->getEntityClass();
      if (!$entity instanceof $entityClass) {
        throw new RuntimeException(static::class . '->' . __FUNCTION__ . "에서 오류발생:Return Type은 {$entityClass}만 가능");
      }

      $this->addViewDatas('entity', $entity);

      // ✅ AJAX 요청이면 JSON 성공 응답
      if ($this->request->isAJAX()) {
        return $this->response->setJSON([
          'ok' => true,
          'message' => "{$this->getTitle()}에서 {$entity->getTitle()} 수정이 완료되었습니다.",
          'id' => $entity->getPK(),
        ]);
      }

      return $this->modify_result_process($entity);

    } catch (FormValidationException $e) {

      // ✅ AJAX 요청이면 422 + 필드별 오류
      if ($this->request->isAJAX()) {
        return $this->response
          ->setStatusCode(422)
          ->setJSON([
            'ok' => false,
            'errors' => $e->errors,
          ]);
      }

      // 기존 redirect 방식 유지
      return $this->action_redirect_process(
        'error',
        static::class . '->' . __FUNCTION__ . "에서 {$this->getTitle()} 수정 오류:\n" . implode("\n", $e->errors)
      );

    } catch (\Throwable $e) {
      log_message('error', 'EXCEPTION_CLASS=' . get_class($e));
      // ✅ AJAX면 500 JSON
      if ($this->request->isAJAX()) {
        return $this->response
          ->setStatusCode(500)
          ->setJSON([
            'ok' => false,
            'message' => static::class . '->' . __FUNCTION__ . "에서 오류:" . $e->getMessage(),
          ]);
      }

      return $this->action_redirect_process(
        'error',
        static::class . '->' . __FUNCTION__ . "에서 {$this->getTitle()} 수정 오류:" . $e->getMessage()
      );
    }
  }


  protected function modify_result_process(CommonEntity $entity, ?string $redirect_url = null): string|RedirectResponse
  {
    return $this->action_redirect_process(
      'info',
      "{$this->getTitle()}에서 {$entity->getTitle()} 수정이 완료되었습니다.",
      $redirect_url ?? '/' . implode('/', [...$this->getActionPaths(), 'view']) . '/' . $entity->getPK()
    );
  }

  // --- 삭제 (Delete) ---
  protected function delete_process($uid): CommonEntity
  {
    return $this->service->delete($uid);
  }

  protected function delete_result_process($entity, ?string $redirect_url = null): string|RedirectResponse
  {
    return $this->action_redirect_process('info', "{$this->getTitle()}에서 {$entity->getTitle()} 삭제가 완료되었습니다.", $redirect_url);
  }

  final public function delete($uid): RedirectResponse
  {
    try {
      if (!$uid) {
        throw new RuntimeException(static::class . '->' . __FUNCTION__ . "에서 {$this->getTitle()}에 번호가 정의 되지 않았습니다.");
      }
      $entity = $this->service->getEntity($uid);
      $entity = $this->delete_process($uid);
      return $this->delete_result_process($entity);
    } catch (\Throwable $e) {
      return $this->action_redirect_process('error', static::class . '->' . __FUNCTION__ . "에서 {$this->getTitle()} 삭제 오류:" . $e->getMessage());
    }
  }

  // --- 상세보기 (View) ---
  protected function view_process($uid): CommonEntity
  {
    return $this->service->getEntity($uid);
  }

  protected function view_result_process(string $action): string
  {
    return $this->action_render_process($action, $this->getViewDatas(), $this->request->getVar('ActionTemplate'));
  }

  final public function view($uid): string|RedirectResponse
  {
    try {
      if (!$uid) {
        throw new RuntimeException(static::class . '->' . __FUNCTION__ . "에서 {$this->getTitle()}에 번호가 정의 되지 않았습니다.");
      }
      $entity = $this->view_process($uid);
      $action = __FUNCTION__;
      $this->action_init_process($action, $entity->toArray());
      $this->addViewDatas('entity', $entity);
      return $this->view_result_process($action);
    } catch (\Throwable $e) {
      return $this->action_redirect_process('error', static::class . '->' . __FUNCTION__ . "에서 {$this->getTitle()} 상세보기 오류:" . $e->getMessage());
    }
  }
}