/**
 * PDF read pipeline (CC FileReadTool parity).
 *
 * CC ground truth (original source code):
 * - Whole-PDF path (`FileReadTool.ts:987-1016` + `utils/pdf.ts:88-103`): the file bytes are base64'd and
 *   sent as a native `{type:"document",source:{type:"base64",media_type:"application/pdf",data}}` content
 *   block — the model reads the text layer directly (no local text extraction).
 * - Page-range path (`utils/pdf.ts:179-230`): CC does NOT split the PDF itself — it shells out to
 *   poppler's `pdftoppm -jpeg -r 100 -f F -l L` and returns the rendered pages as IMAGE blocks.
 * - Page counting (`utils/pdf.ts:119-135`): poppler's `pdfinfo`, parsing `/^Pages:\s+(\d+)/m`; `null`
 *   (tool absent/failed) fails OPEN. We add a zero-dependency byte-scan fallback for uncompressed PDFs.
 * - Limits (`constants/apiLimits.ts:46-84`): 20MB whole-send target, 100MB extraction ceiling, 20 pages
 *   per request, >10 pages ⇒ the `pages` parameter is REQUIRED.
 *
 * sema follows the same shape with the ExecutionEnv seam (works against remote envs too) and honest
 * degradation when poppler is absent — never a fake success.
 */
import type { ExecutionEnv } from "../../internal/harness-types.js";
/** Max pages a single `pages` request may span (CC `PDF_MAX_PAGES_PER_READ`). */
export declare const PDF_MAX_PAGES_PER_READ = 20;
/** Above this page count a whole-PDF read is refused and `pages` is required (CC `PDF_AT_MENTION_INLINE_THRESHOLD`). */
export declare const PDF_INLINE_PAGE_THRESHOLD = 10;
/** Max raw size the page-extraction (pdftoppm) path accepts (CC `PDF_MAX_EXTRACT_SIZE`). The whole-send target
 *  (`PDF_TARGET_RAW_SIZE`) and the `%PDF-` signature test (`pdfMagicMatches`) are the document admission's own
 *  (core/image-admission.ts). */
export declare const PDF_MAX_EXTRACT_SIZE: number;
/** A parsed 1-indexed inclusive page range. `last === Infinity` for an open range ("10-"). */
export interface PdfPageRange {
    first: number;
    last: number;
}
/** Parse the CC `pages` formats — "3", "1-5", "10-" (open range). `undefined` = invalid. */
export declare function parsePdfPageRange(pages: string): PdfPageRange | undefined;
/**
 * Zero-dependency page-count estimate: count `/Type /Page` leaf objects in the raw bytes. Exact for
 * classically-serialized PDFs (incl. linearized — objects stay uncompressed); returns `undefined` when
 * nothing matches (page tree inside compressed object streams — modern writers), NEVER a guess.
 */
export declare function countPdfPagesFromBytes(bytes: Uint8Array): number | undefined;
/** Max chars of a failed poppler call's stderr/stdout kept in the reported error. */
export declare const PDF_EXEC_ERROR_PREVIEW_CHARS = 400;
/** Bound a poppler exec failure's captured stream to {@link PDF_EXEC_ERROR_PREVIEW_CHARS}, marking the cut
 *  (a bare slice reads identical to a short capture that just happened to end there — the model has no way
 *  to tell "that's everything" from "that's all we kept"). Exactly-at-the-cap text is unmarked. */
export declare function previewExecStream(s: string): string;
/**
 * Total page count via poppler `pdfinfo` (CC parity), falling back to {@link countPdfPagesFromBytes}
 * when the tool is absent/fails and the bytes were already read. `undefined` = unknown (fail-open,
 * matching CC's `getPDFPageCount → null`).
 */
export declare function getPdfPageCount(env: ExecutionEnv, absPath: string, bytes: Uint8Array | undefined, signal?: AbortSignal): Promise<number | undefined>;
/** How many leading pages the vision fallback (level 2) renders for a whole-PDF read on a model without
 *  document input — conservative per-request budget; the note directs the model to `pages` for more. */
export declare const PDF_FALLBACK_RENDER_PAGES = 5;
/**
 * PDF capability profile of the SERVING model, consumed by the Read tool's degradation chain (v2):
 * - `document` — the brain path can forward a native `{type:"document"}` block (today: anthropic-messages
 *   WITH vision — anthropic.ts drops document blocks for no-vision models — or an explicit `input`
 *   declaration containing "document" for a future capability bit).
 * - `vision` — `Model.input` contains "image" (absent metadata fails open = today's behavior).
 * Structural parameter (no deep Model import): `prepare-task` passes the task's resolved Model.
 */
export interface PdfModelCapabilities {
    document: boolean;
    vision: boolean;
}
/** Derive {@link PdfModelCapabilities} from a Model-shaped object. `undefined` model = fully capable
 *  (fail-open: no metadata ⇒ preserve the native document-block behavior, brain-level placeholder guards). */
export declare function pdfModelCapabilitiesOf(model?: {
    api?: string;
    input?: readonly string[];
}): PdfModelCapabilities;
/** Timeout for the poppler extraction commands (pdftotext / pdftoppm), in seconds. */
export declare const PDF_EXEC_TIMEOUT_SEC = 120;
/** What cut a run short: the wall-clock budget (always a number), or the env's silence window (a number only when the env states it — otherwise the budget did not elapse and no number is honest). */
export type PdfCut = {
    readonly kind: "budget";
    readonly sec: number;
} | {
    readonly kind: "silence";
    readonly sec?: number;
};
/** A cut in words: the clause that says it (`timed out after 120s` / `was cut after producing no output for 30s` / `was cut for producing no output`) and the noun a later clause calls it. */
export declare function pdfCutWords(cut: PdfCut): {
    clause: string;
    noun: string;
};
export type PdfTextResult = {
    ok: true;
    text: string;
    /** Set when pdftotext was cut by a time bound but had already written partial text: the extraction is
     *  INCOMPLETE (covers only the leading part of the requested range) and the caller must say so. */
    cut?: PdfCut;
} | {
    ok: false;
    toolMissing: boolean;
    timedOut?: boolean;
    error: string;
};
/**
 * Extract the PDF text layer via poppler `pdftotext -layout` (degradation-chain level 1: models without
 * native document input get the text instead of a placeholder). Optional 1-indexed inclusive page range
 * (`-f`/`-l`). Output goes through a temp FILE (not exec stdout — env exec seams may cap/mangle stdout),
 * read back over the env seam so it works against remote envs too. `toolMissing` distinguishes
 * "install poppler" from a real extraction failure.
 */
export declare function extractPdfTextLayer(env: ExecutionEnv, absPath: string, range?: {
    first: number;
    last: number;
}, signal?: AbortSignal): Promise<PdfTextResult>;
export type PdfExtractResult = {
    ok: true;
    pages: Array<{
        pageNumber: number;
        jpeg: Uint8Array;
    }>;
    /** Set when pdftoppm was cut by a time bound but had already rendered complete leading pages: `pages`
     *  covers only a PREFIX of the requested range and the caller must label the delivery as partial. */
    cut?: PdfCut;
} | {
    ok: false;
    toolMissing: boolean;
    timedOut?: boolean;
    error: string;
};
/**
 * Render pages [first..last] to JPEGs via poppler `pdftoppm` (CC `extractPDFPages` parity: `-jpeg -r 100`,
 * 120s timeout). Runs through the ExecutionEnv seam (temp dir + exec + readBinaryFile), so it works
 * wherever the env does. `toolMissing` distinguishes "install poppler" from a real extraction failure.
 */
export declare function extractPdfPagesAsImages(env: ExecutionEnv, absPath: string, first: number, last: number, signal?: AbortSignal): Promise<PdfExtractResult>;