import {
  CustomField,
  CustomFieldFromYAML,
  CustomFieldInput,
} from '@atlassian/forge-graphql-types';
import {
  hasValue,
  isCustomFieldValueEqual,
} from '../../../helpers/isCustomFieldValueEqual';
import {
  buildCustomFieldToUpdateFormat,
  isCustomFieldYamlSelectField,
  mappedCustomFieldsToYamlFormat,
} from './buildCustomFields';

/**
 * Determines whether a custom field needs an update based on the YAML configuration and the current component state.
 *
 * @param yamlCustomField - The custom field configuration from YAML
 * @param componentCustomFields - The custom fields of the current component
 * @returns boolean - True if the custom field needs an update, false otherwise
 */
export function doesCustomFieldNeedUpdate(
  yamlCustomField: CustomFieldFromYAML,
  componentCustomFields: CustomField[],
): boolean {
  const componentCustomField = componentCustomFields.find(
    (currComponentCustomField) =>
      currComponentCustomField.definition.name === yamlCustomField.name,
  );

  // If field not found in component, no update needed
  if (!componentCustomField) {
    return false;
  }

  const yamlCustomFieldType = yamlCustomField.type.toLowerCase();
  const componentCustomFieldToYAML =
    mappedCustomFieldsToYamlFormat(componentCustomField);
  const isCustomFieldMatch =
    componentCustomField.definition.name === yamlCustomField.name &&
    componentCustomFieldToYAML.type === yamlCustomFieldType;
  if (!isCustomFieldMatch) {
    return false;
  }
  const isValueNotEqual = !isCustomFieldValueEqual(
    componentCustomFieldToYAML.value,
    yamlCustomField.value,
  );

  // For single and multi select fields, check if mismatch exists for value(optionId) first, then for display value.
  if (isCustomFieldYamlSelectField(yamlCustomFieldType)) {
    // Update if the optionId is not equal and short circuit display value check.
    if (hasValue(yamlCustomField.value)) {
      return isValueNotEqual;
    }

    // Fallback to display value check if optionId is not present.
    return !isCustomFieldValueEqual(
      componentCustomFieldToYAML.displayValue,
      yamlCustomField.displayValue,
    );
  }

  return isValueNotEqual;
}

/**
 * Filters and builds custom fields that need to be updated.
 *
 * @param customFields - The custom fields from YAML configuration
 * @param currentComponentCustomFields - The custom fields of the current component
 * @returns CustomFieldInput[] - Array of custom fields that need to be updated
 */
export function getCustomFieldsForUpdate(
  customFields: CustomFieldFromYAML[],
  currentComponentCustomFields: CustomField[],
): CustomFieldInput[] {
  if (!customFields) {
    return [];
  }

  const updatedCustomFields = customFields.filter((yamlCustomField) =>
    doesCustomFieldNeedUpdate(yamlCustomField, currentComponentCustomFields),
  );

  return buildCustomFieldToUpdateFormat(
    updatedCustomFields,
    currentComponentCustomFields,
  );
}