<?php

declare(strict_types=1);

require_once __DIR__ . '/../dbinfo.php';

if (!function_exists('lasuca_normalise_panel_key')) {
    /**
     * Normalises a dashboard panel key for consistent storage.
     */
    function lasuca_normalise_panel_key(string $key): string
    {
        return trim($key);
    }
}

if (!function_exists('lasuca_get_section_layout_connection')) {
    /**
     * Opens a MySQL connection configured for the section layouts table.
     */
    function lasuca_get_section_layout_connection(): mysqli|false
    {
        $connection = mysqli_connect($GLOBALS['DB_SERVER'], $GLOBALS['DB_USER'], $GLOBALS['DB_PASS']);
        if (!$connection) {
            error_log('lasuca_get_section_layout_connection: cannot connect to MySQL server: ' . mysqli_connect_error());
            return false;
        }

        if (!mysqli_select_db($connection, $GLOBALS['DB_NAME'])) {
            error_log('lasuca_get_section_layout_connection: cannot select database: ' . mysqli_error($connection));
            mysqli_close($connection);
            return false;
        }

        if (!mysqli_set_charset($connection, 'utf8mb4')) {
            error_log('lasuca_get_section_layout_connection: cannot set charset: ' . mysqli_error($connection));
            mysqli_close($connection);
            return false;
        }

        return $connection;
    }
}

if (!function_exists('lasuca_get_section_order')) {
    /**
     * Retrieves the saved section order for a member/panel combination.
     *
     * @return string[]
     */
    function lasuca_get_section_order(mysqli $connection, string $sectionKey, string $memberId): array
    {
        $normalisedKey = lasuca_normalise_panel_key($sectionKey);
        $safeMemberId = trim($memberId);

        $sql = 'SELECT section_order FROM section_layouts WHERE panel_key = ? AND member_id = ? LIMIT 1';
        $statement = mysqli_prepare($connection, $sql);
        if (!$statement) {
            error_log('lasuca_get_section_order: failed to prepare statement: ' . mysqli_error($connection));
            return [];
        }

        mysqli_stmt_bind_param($statement, 'ss', $normalisedKey, $safeMemberId);

        if (!mysqli_stmt_execute($statement)) {
            error_log('lasuca_get_section_order: failed to execute statement: ' . mysqli_stmt_error($statement));
            mysqli_stmt_close($statement);
            return [];
        }

        $result = mysqli_stmt_get_result($statement);
        mysqli_stmt_close($statement);

        if (!$result instanceof mysqli_result) {
            return [];
        }

        $row = mysqli_fetch_assoc($result);
        mysqli_free_result($result);

        if (!$row) {
            return [];
        }

        $decoded = json_decode((string) $row['section_order'], true);
        if (!is_array($decoded)) {
            return [];
        }

        return array_values(array_filter($decoded, static fn($value): bool => is_string($value) && $value !== ''));
    }
}

if (!function_exists('lasuca_save_section_order')) {
    /**
     * Persists a member's preferred section ordering.
     */
    function lasuca_save_section_order(mysqli $connection, string $sectionKey, string $memberId, array $sectionOrder): bool
    {
        $normalisedKey = lasuca_normalise_panel_key($sectionKey);
        $safeMemberId = trim($memberId);
        $sanitisedOrder = array_values(array_filter($sectionOrder, static fn($value): bool => is_string($value) && $value !== ''));

        $payload = json_encode($sanitisedOrder, JSON_THROW_ON_ERROR);

        $sql = 'INSERT INTO section_layouts (panel_key, member_id, section_order, updated_at)
                VALUES (?, ?, ?, NOW())
                ON DUPLICATE KEY UPDATE section_order = VALUES(section_order), updated_at = NOW()';

        $statement = mysqli_prepare($connection, $sql);
        if (!$statement) {
            error_log('lasuca_save_section_order: failed to prepare statement: ' . mysqli_error($connection));
            return false;
        }

        mysqli_stmt_bind_param($statement, 'sss', $normalisedKey, $safeMemberId, $payload);

        if (!mysqli_stmt_execute($statement)) {
            error_log('lasuca_save_section_order: failed to execute statement: ' . mysqli_stmt_error($statement));
            mysqli_stmt_close($statement);
            return false;
        }

        $affected = mysqli_stmt_affected_rows($statement);
        mysqli_stmt_close($statement);

        return $affected > 0;
    }
}

if (!function_exists('lasuca_reset_section_order')) {
    /**
     * Removes any persisted ordering for the user/panel.
     */
    function lasuca_reset_section_order(mysqli $connection, string $sectionKey, string $memberId): bool
    {
        $normalisedKey = lasuca_normalise_panel_key($sectionKey);
        $safeMemberId = trim($memberId);

        $sql = 'DELETE FROM section_layouts WHERE panel_key = ? AND member_id = ?';
        $statement = mysqli_prepare($connection, $sql);
        if (!$statement) {
            error_log('lasuca_reset_section_order: failed to prepare statement: ' . mysqli_error($connection));
            return false;
        }

        mysqli_stmt_bind_param($statement, 'ss', $normalisedKey, $safeMemberId);

        if (!mysqli_stmt_execute($statement)) {
            error_log('lasuca_reset_section_order: failed to execute statement: ' . mysqli_stmt_error($statement));
            mysqli_stmt_close($statement);
            return false;
        }

        $affected = mysqli_stmt_affected_rows($statement);
        mysqli_stmt_close($statement);

        return $affected > 0;
    }
}

if (!function_exists('lasuca_section_layout_health_check')) {
    /**
     * Performs a lightweight connectivity check for diagnostics.
     */
    function lasuca_section_layout_health_check(): bool
    {
        $connection = lasuca_get_section_layout_connection();
        if (!$connection) {
            return false;
        }

        $result = mysqli_query($connection, 'SELECT 1');
        if ($result instanceof mysqli_result) {
            mysqli_free_result($result);
            mysqli_close($connection);
            return true;
        }

        mysqli_close($connection);
        return false;
    }
}