// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "components/spellcheck/browser/spell_check_host_impl.h"

#include "build/build_config.h"
#include "components/spellcheck/common/spelling_marker.h"
#include "components/spellcheck/spellcheck_buildflags.h"
#include "content/public/browser/browser_thread.h"

#if BUILDFLAG(USE_BROWSER_SPELLCHECKER) && !BUILDFLAG(ENABLE_SPELLING_SERVICE)
namespace {

bool AreSpellingMarkersValid(
    const std::vector<spellcheck::SpellingMarker>& spelling_markers,
    size_t text_length) {
  for (const spellcheck::SpellingMarker& marker : spelling_markers) {
    if (marker.start >= text_length || marker.end > text_length) {
      return false;
    }
  }
  return true;
}

}  // namespace
#endif  //  BUILDFLAG(USE_BROWSER_SPELLCHECKER) &&
        //  !BUILDFLAG(ENABLE_SPELLING_SERVICE)

SpellCheckHostImpl::SpellCheckHostImpl() = default;
SpellCheckHostImpl::~SpellCheckHostImpl() = default;

void SpellCheckHostImpl::NotifyChecked(const std::u16string& word,
                                       bool misspelled) {
  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);

  // This API requires Chrome-only features.
  return;
}

#if BUILDFLAG(USE_RENDERER_SPELLCHECKER)
void SpellCheckHostImpl::CallSpellingService(
    const std::u16string& text,
    CallSpellingServiceCallback callback) {
  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);

  if (text.empty()) {
    mojo::ReportBadMessage("Requested spelling service with empty text");
    return;
  }

  // This API requires Chrome-only features.
  std::move(callback).Run(false, std::vector<SpellCheckResult>());
}
#endif  // BUILDFLAG(USE_RENDERER_SPELLCHECKER)

#if BUILDFLAG(USE_BROWSER_SPELLCHECKER) && !BUILDFLAG(ENABLE_SPELLING_SERVICE)
void SpellCheckHostImpl::RequestTextCheck(
    const std::u16string& text,
    const std::vector<spellcheck::SpellingMarker>& spelling_markers,
    RequestTextCheckCallback callback) {
  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);

  if (text.empty()) {
    mojo::ReportBadMessage("Requested text check with empty text");
    return;
  }

  if (!AreSpellingMarkersValid(spelling_markers, text.length())) {
    mojo::ReportBadMessage(
        "Requested text check with out-of-bound spelling markers");
    return;
  }

  session_bridge_.RequestTextCheck(text, spelling_markers, std::move(callback));
}

#if BUILDFLAG(IS_WIN)
void SpellCheckHostImpl::InitializeDictionaries(
    InitializeDictionariesCallback callback) {
  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
  NOTREACHED();
}
#endif  // BUILDFLAG(IS_WIN)
#endif  //  BUILDFLAG(USE_BROWSER_SPELLCHECKER) &&
        //  !BUILDFLAG(ENABLE_SPELLING_SERVICE)

#if BUILDFLAG(IS_ANDROID)
void SpellCheckHostImpl::DisconnectSessionBridge() {
  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
  session_bridge_.DisconnectSession();
}
#endif