// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef PDF_PDFIUM_PDFIUM_INK_READER_H_
#define PDF_PDFIUM_PDFIUM_INK_READER_H_

#include <optional>
#include <vector>

#include "base/containers/span.h"
#include "pdf/buildflags.h"
#include "third_party/ink/src/ink/geometry/mesh.h"
#include "third_party/ink/src/ink/geometry/partitioned_mesh.h"
#include "third_party/ink/src/ink/geometry/point.h"
#include "third_party/pdfium/public/fpdfview.h"

static_assert(BUILDFLAG(ENABLE_PDF_INK2), "ENABLE_PDF_INK2 not set to true");

namespace chrome_pdf {

struct ReadV2InkPathResult {
  FPDF_PAGEOBJECT page_object;
  ink::PartitionedMesh shape;
};

// Returns whether the given `page` contains a "V2" path created by Ink.
// Returns false if `page` is null.
bool PageContainsV2InkPath(FPDF_PAGE page);

// For the given `page`, iterate through all page objects and import "V2" paths
// created by Ink as ink::PartitionedMeshs. For each shape, also return its
// associated page object. The shapes do not have outlines and are only suitable
// for use with ink::Intersects().
//
// If a path does not match the characteristics of a "V2" path, or if the path
// cannot be properly tessellated, then it is ignored.
//
// If `page` is null, then the return value is an empty vector.
std::vector<ReadV2InkPathResult> ReadV2InkPathsFromPageAsModeledShapes(
    FPDF_PAGE page);

// Exposes internal CreateInkMeshFromPolyline() for testing.
std::optional<ink::Mesh> CreateInkMeshFromPolylineForTesting(
    base::span<const ink::Point> polyline);

}  // namespace chrome_pdf

#endif  // PDF_PDFIUM_PDFIUM_INK_READER_H_