import { LitElement, type PropertyValues } from 'lit';
import type { Attachment } from '../../types/index.js';
/**
 * @tag loquix-attachment-panel
 * @summary Container for managing file attachments with file picker and attachment chips.
 * Drag-and-drop is handled by the parent `loquix-chat-composer` via `loquix-drop-zone`.
 *
 * @csspart panel - The panel container
 * @csspart chips - The chips grid
 * @csspart trigger - The upload trigger button
 *
 * @slot trigger - Custom upload trigger button
 * @slot trigger-icon - Custom icon for the default trigger button
 *
 * @method openFilePicker - Opens the native file picker programmatically
 * @method addFiles - Programmatically add files (e.g. from paste or external drop)
 *
 * @fires loquix-attachment-add - Fired when files are added. Detail: { attachments }
 * @fires loquix-attachment-remove - Re-dispatched from child attachment-chip
 */
export declare class LoquixAttachmentPanel extends LitElement {
    static styles: import("lit").CSSResult[];
    private _localize;
    /** Array of current attachments. */
    attachments: Attachment[];
    /** Accepted file types (MIME or extension). */
    acceptedTypes: string;
    /** Maximum number of files allowed. */
    maxFiles: number;
    /** Maximum file size in bytes (default: 10 MB). */
    maxSize: number;
    /** Allow multiple file selection. */
    multiple: boolean;
    /** Whether the panel is disabled. */
    disabled: boolean;
    /** Hide the default trigger button. Use when providing an external upload button. */
    noTrigger: boolean;
    /** Label text for the default trigger button. */
    triggerLabel?: string;
    private _fileInput?;
    /** Map of attachment id → blob URL for image previews. */
    private _previewUrls;
    private _uploadSvg;
    private get _isMaxReached();
    private _isImageFile;
    /**
     * Returns a blob URL preview for image attachments that have a File object.
     * Lazily creates and caches the URL to avoid re-creating on each render.
     */
    private _getPreviewUrl;
    /** Revoke blob URLs for attachments no longer in the list. */
    private _cleanupPreviewUrls;
    protected updated(changed: PropertyValues): void;
    disconnectedCallback(): void;
    private _handleTriggerClick;
    /**
     * Programmatically opens the native file picker dialog.
     * Respects `disabled` and `maxFiles` constraints.
     */
    openFilePicker(): void;
    /**
     * Programmatically add files (e.g. from paste or external drop).
     * Respects `disabled`, `acceptedTypes`, `maxSize`, and `maxFiles` constraints.
     */
    addFiles(files: File[]): void;
    private _handleFileSelect;
    /**
     * Centralized validation for files from both the file-input and drag-and-drop.
     * Filters by acceptedTypes (MIME type and extension), maxSize, multiple flag,
     * and maxFiles remaining capacity. Returns the validated subset of files.
     */
    private _processFiles;
    /** Run validation then dispatch the attachment-add event. */
    private _emitValidFiles;
    private _handleChipRemove;
    protected render(): import("lit").TemplateResult<1>;
}
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