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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "CacheLog.h"
#include "AppCacheStorage.h"
#include "CacheStorageService.h"

#include "OldWrappers.h"

#include "nsICacheEntryDoomCallback.h"

#include "nsCacheService.h"
#include "nsIApplicationCache.h"
#include "nsIApplicationCacheService.h"
#include "nsIURI.h"
#include "nsNetCID.h"
#include "nsServiceManagerUtils.h"
#include "nsThreadUtils.h"

namespace mozilla {
namespace net {

NS_IMPL_ISUPPORTS_INHERITED0(AppCacheStorage, CacheStorage)

AppCacheStorage::AppCacheStorage(nsILoadContextInfo* aInfo,
                                 nsIApplicationCache* aAppCache)
: CacheStorage(aInfo, true /* disk */, false /* lookup app cache */, false /* skip size check */, false /* pin */)
, mAppCache(aAppCache)
{
  MOZ_COUNT_CTOR(AppCacheStorage);
}

AppCacheStorage::~AppCacheStorage()
{
  ProxyReleaseMainThread(mAppCache);
  MOZ_COUNT_DTOR(AppCacheStorage);
}

NS_IMETHODIMP AppCacheStorage::AsyncOpenURI(nsIURI *aURI,
                                            const nsACString & aIdExtension,
                                            uint32_t aFlags,
                                            nsICacheEntryOpenCallback *aCallback)
{
  if (!CacheStorageService::Self())
    return NS_ERROR_NOT_INITIALIZED;

  NS_ENSURE_ARG(aURI);
  NS_ENSURE_ARG(aCallback);

  nsresult rv;

  nsCOMPtr<nsIApplicationCache> appCache = mAppCache;

  if (!appCache) {
    rv = ChooseApplicationCache(aURI, getter_AddRefs(appCache));
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (!appCache) {
    LOG(("AppCacheStorage::AsyncOpenURI entry not found in any appcache, giving up"));
    aCallback->OnCacheEntryAvailable(nullptr, false, nullptr, NS_ERROR_CACHE_KEY_NOT_FOUND);
    return NS_OK;
  }

  nsCOMPtr<nsIURI> noRefURI;
  rv = aURI->CloneIgnoringRef(getter_AddRefs(noRefURI));
  NS_ENSURE_SUCCESS(rv, rv);

  nsAutoCString cacheKey;
  rv = noRefURI->GetAsciiSpec(cacheKey);
  NS_ENSURE_SUCCESS(rv, rv);

  // This is the only way how to recognize appcache data by the anonymous
  // flag.  There is no way to switch to e.g. a different session, because
  // there is just a single session for an appcache version (identified
  // by the client id).
  if (LoadInfo()->IsAnonymous()) {
    cacheKey = NS_LITERAL_CSTRING("anon&") + cacheKey;
  }

  nsAutoCString scheme;
  rv = noRefURI->GetScheme(scheme);
  NS_ENSURE_SUCCESS(rv, rv);

  RefPtr<_OldCacheLoad> appCacheLoad =
    new _OldCacheLoad(scheme, cacheKey, aCallback, appCache,
                      LoadInfo(), WriteToDisk(), aFlags);
  rv = appCacheLoad->Start();
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}

NS_IMETHODIMP AppCacheStorage::OpenTruncate(nsIURI *aURI, const nsACString & aIdExtension,
                                            nsICacheEntry **aCacheEntry)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP AppCacheStorage::Exists(nsIURI *aURI, const nsACString & aIdExtension,
                                      bool *aResult)
{
  *aResult = false;
  return NS_ERROR_NOT_AVAILABLE;
}

NS_IMETHODIMP AppCacheStorage::AsyncDoomURI(nsIURI *aURI, const nsACString & aIdExtension,
                                            nsICacheEntryDoomCallback* aCallback)
{
  if (!CacheStorageService::Self())
    return NS_ERROR_NOT_INITIALIZED;

  if (!mAppCache) {
    return NS_ERROR_NOT_AVAILABLE;
  }

  RefPtr<_OldStorage> old = new _OldStorage(
    LoadInfo(), WriteToDisk(), LookupAppCache(), true, mAppCache);
  return old->AsyncDoomURI(aURI, aIdExtension, aCallback);
}

NS_IMETHODIMP AppCacheStorage::AsyncEvictStorage(nsICacheEntryDoomCallback* aCallback)
{
  if (!CacheStorageService::Self())
    return NS_ERROR_NOT_INITIALIZED;

  nsresult rv;

  if (!mAppCache) {
    // Discard everything under this storage context
    nsCOMPtr<nsIApplicationCacheService> appCacheService =
      do_GetService(NS_APPLICATIONCACHESERVICE_CONTRACTID, &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = appCacheService->Evict(LoadInfo());
    NS_ENSURE_SUCCESS(rv, rv);
  } else {
    // Discard the group
    RefPtr<_OldStorage> old = new _OldStorage(
      LoadInfo(), WriteToDisk(), LookupAppCache(), true, mAppCache);
    rv = old->AsyncEvictStorage(aCallback);
    NS_ENSURE_SUCCESS(rv, rv);

    return NS_OK;
  }

  if (aCallback)
    aCallback->OnCacheEntryDoomed(NS_OK);

  return NS_OK;
}

NS_IMETHODIMP AppCacheStorage::AsyncVisitStorage(nsICacheStorageVisitor* aVisitor,
                                                 bool aVisitEntries)
{
  if (!CacheStorageService::Self())
    return NS_ERROR_NOT_INITIALIZED;

  LOG(("AppCacheStorage::AsyncVisitStorage [this=%p, cb=%p]", this, aVisitor));

  nsresult rv;

  nsCOMPtr<nsICacheService> serv =
    do_GetService(NS_CACHESERVICE_CONTRACTID, &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  RefPtr<_OldVisitCallbackWrapper> cb = new _OldVisitCallbackWrapper(
    "offline", aVisitor, aVisitEntries, LoadInfo());
  rv = nsCacheService::GlobalInstance()->VisitEntriesInternal(cb);
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}

} // namespace net
} // namespace mozilla