<?php

// ====================
// Import Voter History
// ====================

class Import_VoterHistory {

    // Variables

    private $log = "";
    private $settings = "";
    private $connection = "";

    // ==================
    // Class Constructor.
    // ==================

    public function __construct() {

        // Open the Log

        $this->log = fopen("../scripts/import_voter_history.log", "w+");

        if ($this->log === false) {

            error_log("VoterVue : Unable to open log file");
            exit();
        }

        $this->log(str_repeat("*", 50));

        // Get Settings

        $this->settings = new SimpleXMLElement((file_exists("../xml/settings.xml") ? file_get_contents("../xml/settings.xml") : "<settings/>"));

        if ($this->settings->count() === 0) {

            error_log("VoterVue : Unable to initialize settings");
            exit();
        }

        // Open Database Connections

        $this->connection = $this->connect();
    }

    // ==============================================
    // Return a VoterVue Database Database Connection
    // ==============================================

    public function connect() {

        try {

            $host = (string) $this->settings->DatabaseServer;
            $database = (string) $this->settings->DatabaseName;
            $user = (string) $this->settings->DatabaseUser;
            $password = (string) $this->settings->DatabasePassword;

            $connection = new PDO("mysql:host={$host};dbname={$database};charset=utf8", $user, $password);

            $connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
            $connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        } catch (PDOException | Exception $e) {

            trigger_error($e->getMessage());
        }

        return $connection;
    }

    // =============================
    // Log a message to the Log File
    // =============================

    private function log($message = "") {

        fwrite($this->log, date("Y-m-d H:i A") . " : " . "{$message} \n");
    }

    // ===================
    // Process Parcel Data
    // ===================

    public function process() {

        $this->log("Starting Voter History Import Process");

        $this->importVoterHistory();

        $this->log("Voter History Import Process Completed");
    }

    // ====================
    // Import Voter History
    // ====================

    private function importVoterHistory() {

        $this->log("Processing Voter History Records");

        $path = '/data/ositssrc/projects/votervue_raw_data/20251210_Voter_History_20251210';
        $files = glob("{$path}/*.txt");
        sort($files);

        $SQL = "INSERT IGNORE INTO voterhistory
            (
                voterhistory_county_code,
                voterhistory_voter_id,
                voterhistory_election_date,
                voterhistory_election_type,
                voterhistory_history_code
            )
            VALUES ( ?, ?, ?, ?, ? )";

        $statement = $this->connection->prepare($SQL);

        $counter = 0;
        $batchCounter = 0;
        $batchSize = 50000;

        foreach ($files as $file) {

            $this->log("Importing history file: {$file}");

            $fh = fopen($file, 'r');

            if ($fh === false) {
                $this->log("Unable to open {$file}");
                continue;
            }

            $lineNum = 0;

            try {

                // Start transaction for this file
                $this->connection->beginTransaction();

                while (($line = fgets($fh)) !== false) {
                    $lineNum++;

                    $line = rtrim($line, "\r\n");
                    if ($line === '') {
                        continue;
                    }

                    $cols = explode("\t", $line);

                    if (count($cols) < 5) {
                        $this->log("Skipped malformed line {$lineNum} in {$file} (cols=" . count($cols) . ")");
                        continue;
                    }

                    [$county_code, $voter_id, $election_date, $election_type, $history_code] = $cols;

                    $statement->execute([
                        $this->normalize($county_code),
                        $this->normalize($voter_id),
                        $this->parseDate($election_date),
                        $this->normalize($election_type),
                        $this->normalize($history_code)
                    ]);

                    $counter++;
                    $batchCounter++;

                    // Commit every batchSize rows
                    if ($batchCounter >= $batchSize) {
                        $this->connection->commit();
                        $this->connection->beginTransaction();
                        $batchCounter = 0;

                        $this->log("Processed {$counter} history records...");
                    }
                }

                // Final commit for this file
                $this->connection->commit();
                $batchCounter = 0;
            } catch (Throwable $e) {

                // Roll back any open transaction for this file
                if ($this->connection->inTransaction()) {
                    $this->connection->rollBack();
                }

                $this->log("Insert failed {$file}:{$lineNum} - " . $e->getMessage());
            }

            fclose($fh);
        }

        $this->log("Completed voter history import. Total records processed: {$counter}");
    }

    // =================================
    // Return a $this->normalized String
    // =================================

    private function normalize(?string $value): ?string {

        $value = trim((string) $value);

        return ($value === '' || $value === '*') ? null : $value;
    }

    // ====================
    // Return a Parsed Date
    // ====================

    private function parseDate(?string $value): ?string {

        $value = $this->normalize($value);
        if ($value === null) {
            return null;
        }

        $dt = DateTime::createFromFormat('m/d/Y', $value);

        return $dt ? $dt->format('Y-m-d') : null;
    }
}

?>