<?php
require_once ('Database.php');
require_once ('FacilityData.php');

class FacilityDataSet
{
    protected $_dbHandle, $_dbInstance;

    public function __construct()
    {
        $this->_dbInstance = Database::getInstance();
        $this->_dbHandle = $this->_dbInstance->getDbConnection();
    }

    /**
     * @param $data
     * @return bool
     */
    public function addFacility($data): bool
    {
        $sqlQuery = "
            INSERT INTO ecoFacilities 
                (title, 
                 category, 
                 description, 
                 houseNumber, 
                 streetName, 
                 county, 
                 town, 
                 postcode, 
                 lng, 
                 lat, 
                 contributor)
            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
        ;";
        $stmt = $this->_dbHandle->prepare($sqlQuery);
        // Ensures only one value is returned per column name
        $stmt->setFetchMode(\PDO::FETCH_ASSOC);

        // Initialize index for binding
        $bindIndex = 1;

        // Bind other filters
        for ($i = 1; $i <= 8; $i++) { // Assuming 8 other filters
            $value = !empty($data[$i]) ? "%" . $data[$i] . "%" : "%";
            $stmt->bindValue($bindIndex++, $value, \PDO::PARAM_STR);
        }
        return !($stmt->rowCount());
    }

    public function deleteFacility($id): bool
    {
        $sqlQuery = "DELETE FROM ecoFacilities WHERE id = ?";
        $stmt = $this->_dbHandle->prepare($sqlQuery);
        $stmt->setFetchMode(\PDO::FETCH_ASSOC);
        $stmt->bindValue(1, $id, \PDO::PARAM_INT);
        $stmt->execute();
        return !($stmt->rowCount() == 0);
    }


    public function fetchAll($filterArray, $sortArray): array
    {
        // Define columns for filtering and sorting
        $filterColumns = [
            0 => 'ecoFacilityStatus.statusComment',
            1 => 'ecoFacilities.title',
            2 => 'ecoCategories.name',
            3 => 'ecoFacilities.description',
            4 => 'ecoFacilities.streetName',
            5 => 'ecoFacilities.county',
            6 => 'ecoFacilities.town',
            7 => 'ecoFacilities.postcode',
            8 => 'ecoUser.username'
        ];

        $sortColumns = [
            0 => 'ecoFacilityStatus.statusComment',
            1 => 'ecoFacilities.title',
            2 => 'ecoCategories.name',
            3 => 'ecoFacilities.description',
            4 => 'ecoFacilities.streetName',
            5 => 'ecoFacilities.county',
            6 => 'ecoFacilities.town',
            7 => 'ecoFacilities.postcode',
            8 => 'ecoUser.username'
        ];

        // Validate and select the filter column
        $selectedFilterColumn = $filterColumns[$filterArray['category']] ?? 'ecoFacilities.title';
        // Validate and select the sort column
        $selectedSortColumn = $sortColumns[$sortArray['sort']] ?? 'ecoFacilities.title';
        // Validate sort direction
        $direction = strtolower($sortArray['dir']) === 'desc' ? 'DESC' : 'ASC';
        // Base query for filtering and sorting
        $baseQuery = "
        FROM ecoFacilities
        LEFT JOIN ecoCategories ON ecoCategories.id = ecoFacilities.category
        LEFT JOIN ecoUser ON ecoUser.id = ecoFacilities.contributor
        LEFT JOIN ecoFacilityStatus ON ecoFacilityStatus.facilityid = ecoFacilities.id
        WHERE {$selectedFilterColumn} LIKE :term
    ";


        // Query to count total results
        $countQuery = "SELECT COUNT(DISTINCT ecoFacilities.id) AS total {$baseQuery}";

        // Query to fetch filtered and sorted results
        $dataQuery = "
        SELECT DISTINCT ecoFacilities.id, 
                        ecoFacilities.title, 
                        GROUP_CONCAT(ecoFacilityStatus.statusComment, ', ') AS status, 
                        ecoCategories.name AS category, 
                        ecoFacilities.description, 
                        ecoFacilities.houseNumber, 
                        ecoFacilities.streetName, 
                        ecoFacilities.county, 
                        ecoFacilities.town, 
                        ecoFacilities.postcode, 
                        ecoFacilities.lng, 
                        ecoFacilities.lat, 
                        ecoUser.username AS contributor
        {$baseQuery}
        GROUP BY ecoFacilities.id, ecoFacilities.title, ecoCategories.name, 
                 ecoFacilities.description, ecoFacilities.streetName,
                 ecoFacilities.county, ecoFacilities.town, ecoFacilities.postcode, 
                 ecoUser.username
        ORDER BY {$selectedSortColumn} {$direction};
    ";
        $filterArray['term'] = '%' . $filterArray['term'] . '%' ?? '%';
        var_dump($filterArray);
        // Prepare and execute the count query
        $countStmt = $this->_dbHandle->prepare($countQuery);
        $countStmt->bindValue(':term', $filterArray['term'], PDO::PARAM_STR);
        $countStmt->execute();
        $totalResults = (int)$countStmt->fetchColumn();

        // Prepare and execute the data query
        $dataStmt = $this->_dbHandle->prepare($dataQuery);
        $dataStmt->bindValue(':term', $filterArray['term'], PDO::PARAM_STR);
        $dataStmt->execute();

        // Fetch results into FacilityData objects
        $dataSet = [];
        while ($row = $dataStmt->fetch()) {
            $dataSet[] = new FacilityData($row);
        }

        return [
            'dataset' => $dataSet,
            'count' => $totalResults
        ];
    }

    /**
     * @param $sqlQuery
     * @param $filterArray
     * @return false|PDOStatement
     * Function for fetchAll() to de-dupe code. Performs binding on PDO statements to facilitate
     * filtering of facilities. Returns a bound PDO statement.
     */
//    private function populateFields($sqlQuery, $filterArray, $sortBy, $direction)
//    {
//        $stmt = $this->_dbHandle->prepare($sqlQuery);
//        $stmt->setFetchMode(\PDO::FETCH_ASSOC);
//
//        // Initialize index for binding
//        $bindIndex = 1;
//
//        // Bind statusComment filter, required due to comments not being so.
//        $statusComment = !empty($filterArray[0]) ? "%" . $filterArray[0] . "%" : null;
//        $stmt->bindValue($bindIndex++, $statusComment ?? "%", \PDO::PARAM_STR); // First ?
//        $stmt->bindValue($bindIndex++, $statusComment, $statusComment === null ? \PDO::PARAM_NULL : \PDO::PARAM_STR); // Second ?
//
//        // Bind other filters
//        for ($i = 1; $i <= 8; $i++) { // Assuming 8 other filters
//            $value = !empty($filterArray[$i]) ? "%" . $filterArray[$i] . "%" : "%";
//            $stmt->bindValue($bindIndex++, $value, \PDO::PARAM_STR);
//        }
//        return $stmt;
//    }

    // So i worked on trying to get this to work for 30 minutes and it turns out you
    // can never bind column name values to placeholders, and must use column orders
    // as integers..... what
//        if(isset($sortBy) && isset($direction)) {
//            $stmt->bindValue(':sortBy', $sortBy, \PDO::PARAM_STR);
//            $stmt->bindValue(':direction', $direction, \PDO::PARAM_STR);
//        }
    private function populateFields($sqlQuery, $filterArray)
    {
        $stmt = $this->_dbHandle->prepare($sqlQuery);
        $stmt->setFetchMode(\PDO::FETCH_ASSOC);

        $bindIndex = 1;

        // Bind statusComment (two placeholders required)
        $statusComment = $filterArray[0] ?? '%';
        $stmt->bindValue($bindIndex++, $statusComment, \PDO::PARAM_STR);
        $stmt->bindValue($bindIndex++, $statusComment, \PDO::PARAM_STR);

        // Bind other filters
        for ($i = 1; $i < count($filterArray); $i++) {
            $value = $filterArray[$i] ?? '%';
            print_r($i . ":" . $value . "||\n");
            $stmt->bindValue($bindIndex++, $value, \PDO::PARAM_STR);
        }

        // Debugging
        //$stmt->debugDumpParams();
        return $stmt;
    }

}