<?php

/**
 * @copyright © Melograno Venture Studio. All rights reserved.
 * @licence   See LICENCE.md for license details.
 */

namespace IvyForms\Repository\Field;

use IvyForms\Common\Exceptions\InvalidArgumentException;
use IvyForms\Common\Exceptions\QueryExecutionException;
use IvyForms\Entity\Field\Field;
use IvyForms\Factory\Field\FieldFactory;
use IvyForms\Repository\AbstractRepository;
use IvyForms\Services\Translations\BackendStrings;

/**
 * Class FieldRepository
 *
 * @package IvyForms\Repository\Field
 */
class FieldRepository extends AbstractRepository implements FieldRepositoryInterface
{
    public const FACTORY = FieldFactory::class;

    /**
     * Add field to the database
     *
     * @param Field $entity
     *
     * @return int
     *
     * @throws QueryExecutionException
     */
    public function add($entity): int
    {

        $data = $entity->toArray();

        $result = $this->wpdb->insert(
            $this->table,
            [
                'fieldIndex'   => $data['fieldIndex'],
                'formId'       => $data['formId'],
                'type'         => $data['type'],
                'label'        => $data['label'],
                'required'     => (int)$data['required'],
                'defaultValue' => $data['defaultValue'],
                'placeholder'  => $data['placeholder'],
                'position'     => $data['position'],
                'rowIndex'     => $data['rowIndex'] ?? 0,
                'columnIndex'  => $data['columnIndex'] ?? 0,
                'width'        => $data['width'] ?? 100,
                'parentId'     => $data['parentId'] ?? null,
                'pageId'       => $data['pageId'] ?? null,
                'settings'     => $this->encodeFieldSettings($data, $entity, false),
                'dateCreated'  => current_time('mysql')
            ],
            ['%d', '%d', '%s', '%s', '%d', '%s', '%s',  '%d', '%d', '%d', '%d', '%d', '%s', '%s', '%s']
        );

        if ($result === false) {
            throw new QueryExecutionException(
                BackendStrings::getExceptionStrings()['unable_to_add_data'] . __CLASS__
            );
        }

        return $this->wpdb->insert_id;
    }

    /**
     * Update field in the database
     *
     * @param int      $id
     * @param Field $entity
     *
     * @return bool
     *
     * @throws QueryExecutionException
     */
    public function update(int $id, $entity): bool
    {
        if ($id < 1) {
            throw new InvalidArgumentException('Field id must be a positive integer.');
        }

        $data = $entity->toArray();

        $result = $this->wpdb->update(
            $this->table,
            [
                'fieldIndex'   => $data['fieldIndex'],
                'formId'       => $data['formId'],
                'type'         => $data['type'],
                'label'        => $data['label'],
                'required'     => (int)$data['required'],
                'defaultValue' => $data['defaultValue'],
                'placeholder'  => $data['placeholder'],
                'position'     => $data['position'],
                'rowIndex'     => $data['rowIndex'] ?? 0,
                'columnIndex'  => $data['columnIndex'] ?? 0,
                'width'        => $data['width'] ?? 100,
                'parentId'     => $data['parentId'] ?? null,
                'pageId'       => $data['pageId'] ?? null,
                'settings'     => $this->encodeFieldSettings($data, $entity, true),
            ],
            ['id' => $id],
            ['%d', '%d', '%s', '%s', '%d', '%s', '%s', '%d', '%d', '%d', '%d', '%d', '%s', '%s'],
            ['%d']
        );

        if ($result === false) {
            throw new QueryExecutionException(BackendStrings::getAllFormsStrings()['unable_to_save_data'] . __CLASS__);
        }

        return $result;
    }

    /**
     * @param mixed[] $data
     */
    private function encodeFieldSettings(array $data, Field $entity, bool $forUpdate): string
    {
        $settings = $this->buildFieldSettingsPayload($data, $forUpdate);

        /**
         * Allows modification of the settings data before saving to database.
         *
         * @param mixed[] $settings The current settings array.
         * @param mixed[] $data The full field data array.
         * @param Field $entity The Field entity instance.
         * @return mixed[] The modified settings array.
         */
        $settings = apply_filters('ivyforms/repository/field/settings', $settings, $data, $entity);

        $encoded = wp_json_encode($settings);
        if ($encoded === false) {
            throw new QueryExecutionException(
                'Failed to encode field settings: ' . json_last_error_msg()
            );
        }

        return $encoded;
    }

    /**
     * @param mixed[] $data
     *
     * @return mixed[]
     */
    private function buildFieldSettingsPayload(array $data, bool $forUpdate): array
    {
        return array_merge(
            $this->buildCoreFieldSettings($data, $forUpdate),
            $this->buildFileUploadFieldSettings($data)
        );
    }

    /**
     * @param mixed[] $data
     *
     * @return mixed[]
     */
    private function buildCoreFieldSettings(array $data, bool $forUpdate): array
    {
        return [
            ...$this->buildBaseFieldSettings($data),
            'limitRange' => $this->resolveLimitRangeFlag($data, $forUpdate),
            'visible' => $this->resolveVisibleFlag($data, $forUpdate),
            ...$this->buildExtendedFieldSettings($data),
        ];
    }

    /**
     * @param mixed[] $data
     *
     * @return mixed[]
     */
    private function buildBaseFieldSettings(array $data): array
    {
        return [
            'hideLabel' => (int) $data['hideLabel'],
            'readOnly' => (int) $data['readOnly'],
            'description' => $data['description'],
            'requiredMessage' => $data['requiredMessage'],
            'cssClasses' => $data['cssClasses'],
            'limitMaxLength' => (int) $data['limitMaxLength'],
            'maxLength' => $data['maxLength'],
            'labelPosition' => $data['labelPosition'],
            'noDuplicates' => (int) $data['noDuplicates'],
            'shuffleOptions' => (int) $data['shuffleOptions'],
            'showValues' => (int) $data['showValues'],
            'enableSearch' => (int) $data['enableSearch'],
            'rows' => (int) $data['rows'],
        ];
    }

    /**
     * @param mixed[] $data
     *
     * @return mixed[]
     */
    private function buildExtendedFieldSettings(array $data): array
    {
        return [
            'confirmFieldEnabled' => (int) ($data['confirmFieldEnabled'] ?? 0),
            'confirmFieldLabel' => $data['confirmFieldLabel'] ?? '',
            'confirmFieldPlaceholder' => $data['confirmFieldPlaceholder'] ?? '',
            'confirmFieldHideLabel' => (int) ($data['confirmFieldHideLabel'] ?? 0),
            'phoneFormat' => $data['phoneFormat'],
            'phoneAutoDetect' => $data['phoneAutoDetect'],
            'minValue' => isset($data['minValue']) ? (float) $data['minValue'] : null,
            'maxValue' => isset($data['maxValue']) ? (float) $data['maxValue'] : null,
            'step' => (float) $data['step'],
            'showGrid' => (int) ($data['showGrid'] ?? 0),
            'numberFormat' => $data['numberFormat'] ?? '',
            'inputPrefix' => $data['inputPrefix'] ?? '',
            'inputSuffix' => $data['inputSuffix'] ?? '',
            'timeFieldType' => $data['timeFieldType'] ?? '',
            'timeFormat' => $data['timeFormat'] ?? '',
            'dateFieldType' => $data['dateFieldType'] ?? '',
            'dateFormat' => $data['dateFormat'] ?? '',
            'minDateValue' => $data['minDateValue'] ?? '',
            'maxDateValue' => $data['maxDateValue'] ?? '',
            'showRatingText' => (int) ($data['showRatingText'] ?? 0),
            'ratingIcon' => $data['ratingIcon'] ?? 'star',
            'htmlContent' => $data['htmlContent'] ?? '',
            'agreementText' => $data['agreementText'] ?? '',
            'limitDateRange' => (int) $data['limitDateRange'],
            'minTimeValue' => $data['minTimeValue'] ?? '',
            'maxTimeValue' => $data['maxTimeValue'] ?? '',
            'limitTimeRange' => (int) $data['limitTimeRange'],
            'nameFieldType' => $data['nameFieldType'] ?? '',
            'subFieldIndex' => isset($data['subFieldIndex']) ? (int) $data['subFieldIndex'] : null,
        ];
    }

    /**
     * @param mixed[] $data
     */
    private function resolveLimitRangeFlag(array $data, bool $forUpdate): int
    {
        if (!$forUpdate) {
            return (int) $data['limitRange'];
        }

        return filter_var($data['limitRange'], FILTER_VALIDATE_BOOLEAN) ? 1 : 0;
    }

    /**
     * @param mixed[] $data
     */
    private function resolveVisibleFlag(array $data, bool $forUpdate): int
    {
        if (!$forUpdate) {
            return (int) $data['visible'];
        }

        return array_key_exists('visible', $data) ? (int) $data['visible'] : 1;
    }

    /**
     * @param mixed[] $data
     *
     * @return mixed[]
     */
    private function buildFileUploadFieldSettings(array $data): array
    {
        return [
            'maxFileSizeMb' => isset($data['maxFileSizeMb']) ? (int) $data['maxFileSizeMb'] : 0,
            'saveUploadsTo' => (string) ($data['saveUploadsTo'] ?? 'ivyforms'),
            'allowedFileExtensions' => isset($data['allowedFileExtensions'])
                && is_array($data['allowedFileExtensions'])
                ? array_values($data['allowedFileExtensions'])
                : [],
        ];
    }

    /**
     * Get fields by form ID
     *
     * @param int $id
     *
     * @return mixed[]
     * @throws QueryExecutionException
     */
    public function getFieldsById(int $id): array
    {
        $rows =  $this->wpdb->get_results(
            $this->wpdb->prepare(
                $this->selectQuery() . " WHERE $this->table.formId = %d ORDER BY $this->table.position ASC",
                $id
            ),
            ARRAY_A
        );
        if ($rows === false) {
            throw new QueryExecutionException(
                BackendStrings::getExceptionStrings()['unable_find_by_id'] . __CLASS__
            );
        }
        $result = [];
        foreach ($rows as $row) {
            if (array_key_exists('parentId', $row)) {
                $row['parentId'] = $row['parentId'] !== null ? (int)$row['parentId'] : null;
            }
            $result[] = call_user_func([static::FACTORY, 'create'], $row);
        }
        return $result;
    }

    /**
     * Get multiple fields by their IDs in a single query.
     *
     * @param int[] $fieldIds
     * @return array<int, object> Indexed by field ID
     * @throws QueryExecutionException
     */
    public function getFieldsByIds(array $fieldIds): array
    {
        if (empty($fieldIds)) {
            return [];
        }

        $fieldIds = array_map('intval', $fieldIds);
        $placeholders = implode(',', array_fill(0, count($fieldIds), '%d'));
        $rows = $this->wpdb->get_results(
            $this->wpdb->prepare(
                $this->selectQuery() . " WHERE $this->table.id IN ($placeholders) ORDER BY $this->table.position ASC",
                ...$fieldIds
            ),
            ARRAY_A
        );

        if ($rows === false) {
            throw new QueryExecutionException(
                BackendStrings::getExceptionStrings()['unable_find_by_id'] . __CLASS__
            );
        }

        $result = [];
        foreach ($rows as $row) {
            if (array_key_exists('parentId', $row)) {
                $row['parentId'] = $row['parentId'] !== null ? (int)$row['parentId'] : null;
            }
            $field = call_user_func([static::FACTORY, 'create'], $row);
            $result[$field->getId()] = $field;
        }

        return $result;
    }

    /**
     * Delete multiple fields by their IDs in bulk, and their field options.
     *
     * @param array<int> $ids
     * @return int Number of deleted fields
     * @throws QueryExecutionException
     */
    public function deleteMany(array $ids): int
    {
        if (empty($ids)) {
            return 0;
        }
        $placeholders = implode(',', array_fill(0, count($ids), '%d'));
        $deleteFieldsQuery = "DELETE FROM {$this->table} WHERE id IN ($placeholders)";
        $result = $this->wpdb->query($this->wpdb->prepare($deleteFieldsQuery, ...$ids));
        if ($result === false) {
            throw new QueryExecutionException(
                sprintf(
                    BackendStrings::getExceptionStrings()['failed_delete_by_ids'],
                    implode(', ', $ids),
                    $this->table
                )
            );
        }
        return $result;
    }

    /**
     * Delete multiple fields by foreign key values (formId), and their field options.
     *
     * @param array<int> $formIds
     * @param string $foreignColumn
     * @return int Number of deleted fields
     * @throws QueryExecutionException
     */
    public function deleteManyByForeignKeyValues(array $formIds, string $foreignColumn = 'formId'): int
    {
        if (empty($formIds)) {
            return 0;
        }
        $formIds = array_map('intval', $formIds);
        $placeholders = implode(',', array_fill(0, count($formIds), '%d'));
        $deleteFieldsQuery = "DELETE FROM {$this->table} WHERE {$foreignColumn} IN ($placeholders)";
        $result = $this->wpdb->query($this->wpdb->prepare($deleteFieldsQuery, ...$formIds));
        if ($result === false) {
            throw new QueryExecutionException(
                BackendStrings::getExceptionStrings()['failed_delete_by_foreign_keys']
            );
        }
        return $result;
    }

    /**
     * Delete fields by a single foreign key value (formId), and their field options.
     *
     * @param int $formId
     * @param string $foreignColumn
     * @return int Number of deleted fields
     * @throws QueryExecutionException
     */
    public function deleteOneByForeignKeyValue(int $formId, string $foreignColumn = 'formId'): int
    {
        $deleteFieldsQuery = "DELETE FROM {$this->table} WHERE {$foreignColumn} = %d";
        $result = $this->wpdb->query($this->wpdb->prepare($deleteFieldsQuery, $formId));
        if ($result === false) {
            throw new QueryExecutionException(
                BackendStrings::getExceptionStrings()['failed_delete_by_foreign_key']
            );
        }
        return $result;
    }
}