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<?php declare(strict_types = 1);

namespace MailPoet\Automation\Engine\Data;

if (!defined('ABSPATH')) exit;

use MailPoet\Automation\Engine\Exceptions;
use MailPoet\Automation\Engine\Exceptions\InvalidStateException;
use MailPoet\Automation\Engine\Integration\Payload;
use MailPoet\Automation\Engine\Integration\Subject;
use Throwable;

class StepRunArgs {
  /** @var Automation */
  private $automation;

/** @var AutomationRun */
  private $automationRun;

/** @var Step */
  private $step;

/** @var array<string, SubjectEntry<Subject<Payload>>[]> */
  private $subjectEntries = [];

/** @var array<class-string, string> */
  private $subjectKeyClassMap = [];

/** @var array<string, Field> */
  private $fields = [];

/** @var array<string, string> */
  private $fieldToSubjectMap = [];

/** @var int */
  private $runNumber;

/** @param SubjectEntry<Subject<Payload>>[] $subjectsEntries */
  public function __construct(
    Automation $automation,
    AutomationRun $automationRun,
    Step $step,
    array $subjectsEntries,
    int $runNumber
  ) {
    $this->automation = $automation;
    $this->step = $step;
    $this->automationRun = $automationRun;
    $this->runNumber = $runNumber;

foreach ($subjectsEntries as $entry) {
      $subject = $entry->getSubject();
      $key = $subject->getKey();
      $this->subjectEntries[$key] = array_merge($this->subjectEntries[$key] ?? [], [$entry]);
      $this->subjectKeyClassMap[get_class($subject)] = $key;

foreach ($subject->getFields() as $field) {
        $this->fields[$field->getKey()] = $field;
        $this->fieldToSubjectMap[$field->getKey()] = $key;
      }
    }
  }

public function getAutomation(): Automation {
    return $this->automation;
  }

public function getAutomationRun(): AutomationRun {
    return $this->automationRun;
  }

public function getStep(): Step {
    return $this->step;
  }

/** @return array<string, SubjectEntry<Subject<Payload>>[]> */
  public function getSubjectEntries(): array {
    return $this->subjectEntries;
  }

/** @return SubjectEntry<Subject<Payload>> */
  public function getSingleSubjectEntry(string $key): SubjectEntry {
    $subjects = $this->subjectEntries[$key] ?? [];
    if (count($subjects) === 0) {
      throw Exceptions::subjectDataNotFound($key, $this->automationRun->getId());
    }
    if (count($subjects) > 1) {
      throw Exceptions::multipleSubjectsFound($key, $this->automationRun->getId());
    }
    return $subjects[0];
  }

/**
   * @template P of Payload
   * @template S of Subject<P>
   * @param class-string<S> $class
   * @return SubjectEntry<S<P>>
   */
  public function getSingleSubjectEntryByClass(string $class): SubjectEntry {
    $key = $this->subjectKeyClassMap[$class] ?? null;
    if (!$key) {
      throw Exceptions::subjectClassNotFound($class);
    }

/** @var SubjectEntry<S<P>> $entry -- for PHPStan */
    $entry = $this->getSingleSubjectEntry($key);
    return $entry;
  }

/**
   * @template P of Payload
   * @param class-string<P> $class
   * @return P
   */
  public function getSinglePayloadByClass(string $class): Payload {
    $payloads = [];
    foreach ($this->subjectEntries as $entries) {
      foreach ($entries as $entry) {
        $payload = $entry->getPayload();
        if (get_class($payload) === $class) {
          $payloads[] = $payload;
        }
      }
    }

if (count($payloads) === 0) {
      throw Exceptions::payloadNotFound($class, $this->automationRun->getId());
    }
    if (count($payloads) > 1) {
      throw Exceptions::multiplePayloadsFound($class, $this->automationRun->getId());
    }

// ensure PHPStan we're indeed returning an instance of $class
    $payload = $payloads[0];
    if (!$payload instanceof $class) {
      throw InvalidStateException::create();
    }
    return $payload;
  }

/** @return mixed */
  public function getFieldValue(string $key, array $params = []) {
    $field = $this->fields[$key] ?? null;
    $subjectKey = $this->fieldToSubjectMap[$key] ?? null;
    if (!$field || !$subjectKey) {
      throw Exceptions::fieldNotFound($key);
    }

$entry = $this->getSingleSubjectEntry($subjectKey);
    try {
      $value = $field->getValue($entry->getPayload(), $params);
    } catch (Throwable $e) {
      throw Exceptions::fieldLoadFailed($field->getKey(), $field->getArgs());
    }
    return $value;
  }

public function getRunNumber(): int {
    return $this->runNumber;
  }

public function isFirstRun(): bool {
    return $this->runNumber === 1;
  }
}