<?php
define("NO_KEEP_STATISTIC", true);
define("NOT_CHECK_PERMISSIONS", false);

require($_SERVER["DOCUMENT_ROOT"] . "/bitrix/modules/main/include/prolog_before.php");

global $USER, $APPLICATION, $CACHE_MANAGER;

$IBLOCK_ID = 123;
$SESSION_KEY = "PS_DELETE_IBLOCK_" . $IBLOCK_ID;

if (!$USER || !$USER->IsAdmin()) {
    http_response_code(403);
    die("Доступ запрещен");
}

if (!CModule::IncludeModule("iblock")) {
    die("Модуль iblock не подключен");
}

@set_time_limit(0);
ignore_user_abort(true);

function psDeleteJson($data)
{
    global $APPLICATION;

    if (method_exists($APPLICATION, "RestartBuffer")) {
        $APPLICATION->RestartBuffer();
    }

    header("Content-Type: application/json; charset=UTF-8");
    echo json_encode($data, JSON_UNESCAPED_UNICODE);

    require($_SERVER["DOCUMENT_ROOT"] . "/bitrix/modules/main/include/epilog_after.php");
    exit;
}

function psGetElementsCount($iblockId)
{
    return (int)CIBlockElement::GetList(
        [],
        [
            "IBLOCK_ID" => $iblockId,
            "CHECK_PERMISSIONS" => "N",
        ],
        []
    );
}

function psGetBatchIds($iblockId, $limit, $excludeIds = [])
{
    $filter = [
        "IBLOCK_ID" => $iblockId,
        "CHECK_PERMISSIONS" => "N",
    ];

    if (!empty($excludeIds)) {
        $filter["!ID"] = array_values($excludeIds);
    }

    $ids = [];

    $res = CIBlockElement::GetList(
        ["ID" => "ASC"],
        $filter,
        false,
        ["nTopCount" => $limit],
        ["ID"]
    );

    while ($row = $res->Fetch()) {
        $ids[] = (int)$row["ID"];
    }

    return $ids;
}

if (
    isset($_REQUEST["ajax"])
    && $_REQUEST["ajax"] === "Y"
) {
    if (!check_bitrix_sessid()) {
        psDeleteJson([
            "success" => false,
            "message" => "Ошибка сессии. Обновите страницу и попробуйте снова.",
        ]);
    }

    $action = isset($_REQUEST["action"]) ? (string)$_REQUEST["action"] : "";

    if ($action === "init") {
        $total = psGetElementsCount($IBLOCK_ID);

        $_SESSION[$SESSION_KEY] = [
            "total" => $total,
            "processed" => 0,
            "deleted" => 0,
            "failed" => [],
            "started_at" => time(),
        ];

        psDeleteJson([
            "success" => true,
            "total" => $total,
            "processed" => 0,
            "deleted" => 0,
            "failed" => 0,
            "percent" => $total > 0 ? 0 : 100,
            "done" => $total <= 0,
            "message" => $total > 0
                ? "Найдено элементов: " . $total
                : "В инфоблоке нет элементов для удаления",
        ]);
    }

    if ($action === "delete") {
        if (empty($_SESSION[$SESSION_KEY])) {
            psDeleteJson([
                "success" => false,
                "message" => "Сессия удаления не найдена. Запустите удаление заново.",
            ]);
        }

        $step = isset($_REQUEST["step"]) ? (int)$_REQUEST["step"] : 50;

        if ($step < 1) {
            $step = 1;
        }

        if ($step > 1000) {
            $step = 1000;
        }

        $session = &$_SESSION[$SESSION_KEY];

        $total = (int)$session["total"];
        $failedIds = !empty($session["failed"]) ? array_keys($session["failed"]) : [];

        $ids = psGetBatchIds($IBLOCK_ID, $step, $failedIds);

        if (empty($ids)) {
            if (is_object($CACHE_MANAGER)) {
                $CACHE_MANAGER->ClearByTag("iblock_id_" . $IBLOCK_ID);
            }

            psDeleteJson([
                "success" => true,
                "total" => $total,
                "processed" => (int)$session["processed"],
                "deleted" => (int)$session["deleted"],
                "failed" => count($session["failed"]),
                "percent" => 100,
                "done" => true,
                "message" => "Удаление завершено",
            ]);
        }

        $deletedInStep = 0;
        $failedInStep = 0;
        $errors = [];

        foreach ($ids as $elementId) {
            $deleteResult = CIBlockElement::Delete($elementId);

            $session["processed"]++;

            if ($deleteResult) {
                $session["deleted"]++;
                $deletedInStep++;
            } else {
                $failedInStep++;

                $errorText = "Неизвестная ошибка";

                if (is_object($GLOBALS["APPLICATION"])) {
                    $exception = $GLOBALS["APPLICATION"]->GetException();
                    if ($exception) {
                        $errorText = $exception->GetString();
                    }
                }

                $session["failed"][$elementId] = $errorText;

                $errors[] = [
                    "id" => $elementId,
                    "error" => $errorText,
                ];
            }
        }

        $processed = (int)$session["processed"];
        $deleted = (int)$session["deleted"];
        $failed = count($session["failed"]);

        $percent = $total > 0 ? round(($processed / $total) * 100, 2) : 100;

        if ($percent > 100) {
            $percent = 100;
        }

        $done = $processed >= $total || count($ids) < $step;

        if ($done && is_object($CACHE_MANAGER)) {
            $CACHE_MANAGER->ClearByTag("iblock_id_" . $IBLOCK_ID);
        }

        psDeleteJson([
            "success" => true,
            "total" => $total,
            "processed" => $processed,
            "deleted" => $deleted,
            "failed" => $failed,
            "deleted_in_step" => $deletedInStep,
            "failed_in_step" => $failedInStep,
            "percent" => $percent,
            "done" => $done,
            "errors" => $errors,
            "message" => $done ? "Удаление завершено" : "Удаление продолжается",
        ]);
    }

    psDeleteJson([
        "success" => false,
        "message" => "Неизвестное действие",
    ]);
}

?>
<!DOCTYPE html>
<html lang="ru">
<head>
    <meta charset="UTF-8">
    <title>Массовое удаление элементов инфоблока <?=htmlspecialcharsbx($IBLOCK_ID)?></title>

    <style>
        body {
            margin: 0;
            padding: 40px;
            font-family: Arial, sans-serif;
            background: #f4f6f8;
            color: #222;
        }

        .delete-page {
            max-width: 900px;
            margin: 0 auto;
            background: #fff;
            border-radius: 16px;
            padding: 32px;
            box-shadow: 0 10px 35px rgba(0, 0, 0, 0.08);
        }

        .delete-page h1 {
            margin: 0 0 12px;
            font-size: 28px;
            line-height: 1.25;
        }

        .delete-warning {
            margin: 20px 0;
            padding: 16px 18px;
            border-radius: 12px;
            background: #fff3cd;
            border: 1px solid #ffe08a;
            color: #7a5200;
            line-height: 1.5;
        }

        .delete-settings {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: flex-end;
            margin: 24px 0;
        }

        .delete-field {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .delete-field label {
            font-size: 14px;
            color: #555;
        }

        .delete-field input {
            width: 160px;
            height: 44px;
            border: 1px solid #d8dde6;
            border-radius: 10px;
            padding: 0 12px;
            font-size: 16px;
        }

        .delete-btn {
            height: 44px;
            border: none;
            border-radius: 10px;
            padding: 0 20px;
            font-size: 15px;
            cursor: pointer;
            transition: 0.2s;
        }

        .delete-btn--start {
            background: #d93025;
            color: #fff;
        }

        .delete-btn--start:hover {
            background: #b9271f;
        }

        .delete-btn--stop {
            background: #e9edf3;
            color: #222;
        }

        .delete-btn:disabled {
            opacity: 0.55;
            cursor: not-allowed;
        }

        .delete-progress {
            margin-top: 28px;
        }

        .delete-progress__bar {
            width: 100%;
            height: 24px;
            background: #e9edf3;
            border-radius: 999px;
            overflow: hidden;
        }

        .delete-progress__fill {
            width: 0;
            height: 100%;
            background: linear-gradient(90deg, #d93025, #ff7a59);
            border-radius: 999px;
            transition: width 0.25s ease;
        }

        .delete-progress__info {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 12px;
            margin-top: 18px;
        }

        .delete-stat {
            padding: 14px;
            border-radius: 12px;
            background: #f6f8fb;
        }

        .delete-stat__label {
            font-size: 13px;
            color: #677082;
            margin-bottom: 6px;
        }

        .delete-stat__value {
            font-size: 22px;
            font-weight: 700;
        }

        .delete-log {
            margin-top: 24px;
            height: 220px;
            overflow: auto;
            background: #111827;
            color: #e5e7eb;
            border-radius: 12px;
            padding: 16px;
            font-family: Consolas, monospace;
            font-size: 13px;
            line-height: 1.45;
        }

        .delete-log div {
            margin-bottom: 4px;
        }

        @media (max-width: 700px) {
            body {
                padding: 16px;
            }

            .delete-page {
                padding: 20px;
            }

            .delete-progress__info {
                grid-template-columns: 1fr 1fr;
            }
        }
    </style>
</head>
<body>

<div class="delete-page">
    <h1>Массовое удаление элементов инфоблока <?=$IBLOCK_ID?></h1>

    <div class="delete-warning">
        Внимание: скрипт удаляет элементы инфоблока физически. Перед запуском сделайте резервную копию базы данных.
        После завершения работы удалите этот файл с сайта.
    </div>

    <div class="delete-settings">
        <div class="delete-field">
            <label for="deleteStep">Шаг удаления за один запрос</label>
            <input type="number" id="deleteStep" value="50" min="1" max="1000">
        </div>

        <button type="button" class="delete-btn delete-btn--start" id="startDelete">
            Начать удаление
        </button>

        <button type="button" class="delete-btn delete-btn--stop" id="stopDelete" disabled>
            Остановить
        </button>
    </div>

    <div class="delete-progress">
        <div class="delete-progress__bar">
            <div class="delete-progress__fill" id="progressFill"></div>
        </div>

        <div class="delete-progress__info">
            <div class="delete-stat">
                <div class="delete-stat__label">Всего</div>
                <div class="delete-stat__value" id="totalCount">0</div>
            </div>

            <div class="delete-stat">
                <div class="delete-stat__label">Обработано</div>
                <div class="delete-stat__value" id="processedCount">0</div>
            </div>

            <div class="delete-stat">
                <div class="delete-stat__label">Удалено</div>
                <div class="delete-stat__value" id="deletedCount">0</div>
            </div>

            <div class="delete-stat">
                <div class="delete-stat__label">Ошибок</div>
                <div class="delete-stat__value" id="failedCount">0</div>
            </div>
        </div>
    </div>

    <div class="delete-log" id="deleteLog"></div>
</div>

<script>
    const ajaxUrl = window.location.pathname;
    const sessid = '<?=CUtil::JSEscape(bitrix_sessid())?>';

    const startBtn = document.getElementById('startDelete');
    const stopBtn = document.getElementById('stopDelete');
    const stepInput = document.getElementById('deleteStep');

    const progressFill = document.getElementById('progressFill');
    const totalCount = document.getElementById('totalCount');
    const processedCount = document.getElementById('processedCount');
    const deletedCount = document.getElementById('deletedCount');
    const failedCount = document.getElementById('failedCount');
    const deleteLog = document.getElementById('deleteLog');

    let stopped = false;

    function logMessage(text) {
        const item = document.createElement('div');
        item.textContent = '[' + new Date().toLocaleTimeString() + '] ' + text;
        deleteLog.appendChild(item);
        deleteLog.scrollTop = deleteLog.scrollHeight;
    }

    function updateProgress(data) {
        totalCount.textContent = data.total || 0;
        processedCount.textContent = data.processed || 0;
        deletedCount.textContent = data.deleted || 0;
        failedCount.textContent = data.failed || 0;

        const percent = data.percent || 0;
        progressFill.style.width = percent + '%';
    }

    function sendRequest(params) {
        params.ajax = 'Y';
        params.sessid = sessid;

        return fetch(ajaxUrl, {
            method: 'POST',
            credentials: 'same-origin',
            headers: {
                'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'
            },
            body: new URLSearchParams(params)
        }).then(response => response.json());
    }

    function runDeleteStep() {
        if (stopped) {
            startBtn.disabled = false;
            stopBtn.disabled = true;
            stepInput.disabled = false;
            logMessage('Удаление остановлено пользователем');
            return;
        }

        let step = parseInt(stepInput.value, 10);

        if (!step || step < 1) {
            step = 1;
        }

        if (step > 1000) {
            step = 1000;
        }

        sendRequest({
            action: 'delete',
            step: step
        }).then(data => {
            if (!data.success) {
                logMessage(data.message || 'Ошибка удаления');
                startBtn.disabled = false;
                stopBtn.disabled = true;
                stepInput.disabled = false;
                return;
            }

            updateProgress(data);

            logMessage(
                'Шаг выполнен. Удалено за шаг: ' +
                (data.deleted_in_step || 0) +
                ', ошибок за шаг: ' +
                (data.failed_in_step || 0) +
                ', прогресс: ' +
                (data.percent || 0) +
                '%'
            );

            if (data.errors && data.errors.length) {
                data.errors.forEach(errorItem => {
                    logMessage('Ошибка элемента ID ' + errorItem.id + ': ' + errorItem.error);
                });
            }

            if (data.done) {
                startBtn.disabled = false;
                stopBtn.disabled = true;
                stepInput.disabled = false;
                logMessage(data.message || 'Удаление завершено');
                return;
            }

            setTimeout(runDeleteStep, 250);
        }).catch(error => {
            logMessage('Ошибка запроса: ' + error.message);
            startBtn.disabled = false;
            stopBtn.disabled = true;
            stepInput.disabled = false;
        });
    }

    startBtn.addEventListener('click', function () {
        const confirmText = 'Вы точно хотите удалить все элементы инфоблока <?=CUtil::JSEscape($IBLOCK_ID)?>? Действие необратимо.';

        if (!confirm(confirmText)) {
            return;
        }

        stopped = false;

        startBtn.disabled = true;
        stopBtn.disabled = false;
        stepInput.disabled = true;

        deleteLog.innerHTML = '';
        updateProgress({
            total: 0,
            processed: 0,
            deleted: 0,
            failed: 0,
            percent: 0
        });

        logMessage('Инициализация удаления');

        sendRequest({
            action: 'init'
        }).then(data => {
            if (!data.success) {
                logMessage(data.message || 'Ошибка инициализации');
                startBtn.disabled = false;
                stopBtn.disabled = true;
                stepInput.disabled = false;
                return;
            }

            updateProgress(data);
            logMessage(data.message);

            if (data.done) {
                startBtn.disabled = false;
                stopBtn.disabled = true;
                stepInput.disabled = false;
                return;
            }

            runDeleteStep();
        }).catch(error => {
            logMessage('Ошибка запроса: ' + error.message);
            startBtn.disabled = false;
            stopBtn.disabled = true;
            stepInput.disabled = false;
        });
    });

    stopBtn.addEventListener('click', function () {
        stopped = true;
        stopBtn.disabled = true;
    });
</script>

</body>
</html>