/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "msgCore.h"
#include "nsImapUtils.h"
#include "nsCOMPtr.h"
#include "prsystem.h"
#include "prprf.h"
#include "nsNetCID.h"

#include "nsMsgUtils.h"
#include "nsImapFlagAndUidState.h"
#include "nsImapNamespace.h"
#include "nsIImapFlagAndUidState.h"

nsresult nsImapURI2FullName(const char* rootURI, const char* hostName,
                            const char* uriStr, char** name) {
  nsAutoCString uri(uriStr);
  nsAutoCString fullName;
  if (uri.Find(rootURI) != 0) return NS_ERROR_FAILURE;
  fullName = Substring(uri, strlen(rootURI));
  uri = fullName;
  int32_t hostStart = uri.Find(hostName);
  if (hostStart <= 0) return NS_ERROR_FAILURE;
  fullName = Substring(uri, hostStart);
  uri = fullName;
  int32_t hostEnd = uri.FindChar('/');
  if (hostEnd <= 0) return NS_ERROR_FAILURE;
  fullName = Substring(uri, hostEnd + 1);
  if (fullName.IsEmpty()) return NS_ERROR_FAILURE;
  *name = ToNewCString(fullName);
  return NS_OK;
}

/* parses ImapMessageURI */
nsresult nsParseImapMessageURI(const nsACString& uri, nsCString& folderURI,
                               uint32_t* key, char** part) {
  if (!key) return NS_ERROR_NULL_POINTER;

  const nsPromiseFlatCString& uriStr = PromiseFlatCString(uri);
  int32_t folderEnd = -1;
  // imap-message uri's can have imap:// url strings tacked on the end,
  // e.g., when opening/saving attachments. We don't want to look for '#'
  // in that part of the uri, if the attachment name contains '#',
  // so check for that here.
  if (StringBeginsWith(uriStr, "imap-message"_ns))
    folderEnd = uriStr.Find("imap://");

  int32_t keySeparator = uriStr.RFindChar('#', folderEnd);
  if (keySeparator != -1) {
    int32_t keyEndSeparator = MsgFindCharInSet(uriStr, "/?&", keySeparator);
    nsAutoString folderPath;
    folderURI = StringHead(uriStr, keySeparator);
    folderURI.Cut(4, 8);  // cut out the _message part of imap-message:
    // folder uri's don't have fully escaped usernames.
    int32_t atPos = folderURI.FindChar('@');
    if (atPos != -1) {
      nsCString unescapedName, escapedName;
      int32_t userNamePos = folderURI.Find("//") + 2;
      uint32_t origUserNameLen = atPos - userNamePos;
      if (NS_SUCCEEDED(MsgUnescapeString(
              Substring(folderURI, userNamePos, origUserNameLen), 0,
              unescapedName))) {
        // Re-escape the username, matching the way we do it in uris, not the
        // way necko escapes urls. See nsMsgIncomingServer::GetServerURI.
        MsgEscapeString(unescapedName, nsINetUtil::ESCAPE_XALPHAS, escapedName);
        folderURI.Replace(userNamePos, origUserNameLen, escapedName);
      }
    }
    nsAutoCString keyStr;
    if (keyEndSeparator != -1)
      keyStr = Substring(uriStr, keySeparator + 1,
                         keyEndSeparator - (keySeparator + 1));
    else
      keyStr = Substring(uriStr, keySeparator + 1);

    *key = strtoul(keyStr.get(), nullptr, 10);

    if (part && keyEndSeparator != -1) {
      int32_t partPos = uriStr.Find("part=", keyEndSeparator);
      if (partPos != -1) {
        *part = ToNewCString(Substring(uriStr, keyEndSeparator));
      }
    }
  }
  return NS_OK;
}

nsresult nsBuildImapMessageURI(const char* baseURI, uint32_t key,
                               nsACString& uri) {
  uri.Append(baseURI);
  uri.Append('#');
  uri.AppendInt(key);
  return NS_OK;
}

nsresult nsCreateImapBaseMessageURI(const nsACString& baseURI,
                                    nsCString& baseMessageURI) {
  nsAutoCString tailURI(baseURI);
  // chop off imap:/
  if (tailURI.Find(kImapRootURI) == 0) tailURI.Cut(0, PL_strlen(kImapRootURI));
  baseMessageURI = kImapMessageRootURI;
  baseMessageURI += tailURI;
  return NS_OK;
}

// nsImapMailboxSpec definition
NS_IMPL_ISUPPORTS(nsImapMailboxSpec, nsIMailboxSpec)

nsImapMailboxSpec::nsImapMailboxSpec() {
  mFolder_UIDVALIDITY = 0;
  mHighestModSeq = 0;
  mNumOfMessages = 0;
  mNumOfUnseenMessages = 0;
  mNumOfRecentMessages = 0;
  mNextUID = 0;

  mBoxFlags = 0;
  mSupportedUserFlags = 0;

  mHierarchySeparator = '\0';

  mFolderSelected = false;
  mDiscoveredFromLsub = false;

  mOnlineVerified = false;
  mNamespaceForFolder = nullptr;
}

nsImapMailboxSpec::~nsImapMailboxSpec() {}

NS_IMPL_GETSET(nsImapMailboxSpec, Folder_UIDVALIDITY, int32_t,
               mFolder_UIDVALIDITY)
NS_IMPL_GETSET(nsImapMailboxSpec, HighestModSeq, uint64_t, mHighestModSeq)
NS_IMPL_GETSET(nsImapMailboxSpec, NumMessages, int32_t, mNumOfMessages)
NS_IMPL_GETSET(nsImapMailboxSpec, NumUnseenMessages, int32_t,
               mNumOfUnseenMessages)
NS_IMPL_GETSET(nsImapMailboxSpec, NumRecentMessages, int32_t,
               mNumOfRecentMessages)
NS_IMPL_GETSET(nsImapMailboxSpec, NextUID, int32_t, mNextUID)
NS_IMPL_GETSET(nsImapMailboxSpec, HierarchyDelimiter, char, mHierarchySeparator)
NS_IMPL_GETSET(nsImapMailboxSpec, FolderSelected, bool, mFolderSelected)
NS_IMPL_GETSET(nsImapMailboxSpec, DiscoveredFromLsub, bool, mDiscoveredFromLsub)
NS_IMPL_GETSET(nsImapMailboxSpec, OnlineVerified, bool, mOnlineVerified)
NS_IMPL_GETSET(nsImapMailboxSpec, SupportedUserFlags, uint32_t,
               mSupportedUserFlags)
NS_IMPL_GETSET(nsImapMailboxSpec, Box_flags, uint32_t, mBoxFlags)
NS_IMPL_GETSET(nsImapMailboxSpec, NamespaceForFolder, nsImapNamespace*,
               mNamespaceForFolder)

NS_IMETHODIMP nsImapMailboxSpec::GetAllocatedPathName(
    nsACString& aAllocatedPathName) {
  aAllocatedPathName = mAllocatedPathName;
  return NS_OK;
}

NS_IMETHODIMP nsImapMailboxSpec::SetAllocatedPathName(
    const nsACString& aAllocatedPathName) {
  mAllocatedPathName = aAllocatedPathName;
  return NS_OK;
}

NS_IMETHODIMP nsImapMailboxSpec::GetUnicharPathName(
    nsAString& aUnicharPathName) {
  aUnicharPathName = mUnicharPathName;
  return NS_OK;
}

NS_IMETHODIMP nsImapMailboxSpec::SetUnicharPathName(
    const nsAString& aUnicharPathName) {
  mUnicharPathName = aUnicharPathName;
  return NS_OK;
}

NS_IMETHODIMP nsImapMailboxSpec::GetHostName(nsACString& aHostName) {
  aHostName = mHostName;
  return NS_OK;
}

NS_IMETHODIMP nsImapMailboxSpec::SetHostName(const nsACString& aHostName) {
  mHostName = aHostName;
  return NS_OK;
}

NS_IMETHODIMP nsImapMailboxSpec::GetFlagState(
    nsIImapFlagAndUidState** aFlagState) {
  NS_ENSURE_ARG_POINTER(aFlagState);
  NS_IF_ADDREF(*aFlagState = mFlagState);
  return NS_OK;
}

NS_IMETHODIMP nsImapMailboxSpec::SetFlagState(
    nsIImapFlagAndUidState* aFlagState) {
  NS_ENSURE_ARG_POINTER(aFlagState);
  mFlagState = aFlagState;
  return NS_OK;
}

nsImapMailboxSpec& nsImapMailboxSpec::operator=(
    const nsImapMailboxSpec& aCopy) {
  mFolder_UIDVALIDITY = aCopy.mFolder_UIDVALIDITY;
  mHighestModSeq = aCopy.mHighestModSeq;
  mNumOfMessages = aCopy.mNumOfMessages;
  mNumOfUnseenMessages = aCopy.mNumOfUnseenMessages;
  mNumOfRecentMessages = aCopy.mNumOfRecentMessages;

  mBoxFlags = aCopy.mBoxFlags;
  mSupportedUserFlags = aCopy.mSupportedUserFlags;

  mAllocatedPathName.Assign(aCopy.mAllocatedPathName);
  mUnicharPathName.Assign(aCopy.mUnicharPathName);
  mHostName.Assign(aCopy.mHostName);

  mFlagState = aCopy.mFlagState;
  mNamespaceForFolder = aCopy.mNamespaceForFolder;

  mFolderSelected = aCopy.mFolderSelected;
  mDiscoveredFromLsub = aCopy.mDiscoveredFromLsub;

  mOnlineVerified = aCopy.mOnlineVerified;

  return *this;
}

// use the flagState to determine if the gaps in the msgUids correspond to gaps
// in the mailbox, in which case we can still use ranges. If flagState is null,
// we won't do this.
void AllocateImapUidString(const uint32_t* msgUids, uint32_t& msgCount,
                           nsImapFlagAndUidState* flagState,
                           nsCString& returnString) {
  uint32_t startSequence = (msgCount > 0) ? msgUids[0] : 0xFFFFFFFF;
  uint32_t curSequenceEnd = startSequence;
  uint32_t total = msgCount;
  int32_t curFlagStateIndex = -1;

  // a partial fetch flag state doesn't help us, so don't use it.
  if (flagState && flagState->GetPartialUIDFetch()) flagState = nullptr;

  for (uint32_t keyIndex = 0; keyIndex < total; keyIndex++) {
    uint32_t curKey = msgUids[keyIndex];
    uint32_t nextKey =
        (keyIndex + 1 < total) ? msgUids[keyIndex + 1] : 0xFFFFFFFF;
    bool lastKey = (nextKey == 0xFFFFFFFF);

    if (lastKey) curSequenceEnd = curKey;

    if (!lastKey) {
      if (nextKey == curSequenceEnd + 1) {
        curSequenceEnd = nextKey;
        curFlagStateIndex++;
        continue;
      }
      if (flagState) {
        if (curFlagStateIndex == -1) {
          bool foundIt;
          flagState->GetMessageFlagsFromUID(curSequenceEnd, &foundIt,
                                            &curFlagStateIndex);
          if (!foundIt) {
            NS_WARNING("flag state missing key");
            // The start of this sequence is missing from flag state, so move
            // on to the next key.
            curFlagStateIndex = -1;
            curSequenceEnd = startSequence = nextKey;
            continue;
          }
        }
        curFlagStateIndex++;
        uint32_t nextUidInFlagState;
        nsresult rv =
            flagState->GetUidOfMessage(curFlagStateIndex, &nextUidInFlagState);
        if (NS_SUCCEEDED(rv) && nextUidInFlagState == nextKey) {
          curSequenceEnd = nextKey;
          continue;
        }
      }
    }
    if (curSequenceEnd > startSequence) {
      returnString.AppendInt((int64_t)startSequence);
      returnString += ':';
      returnString.AppendInt((int64_t)curSequenceEnd);
      startSequence = nextKey;
      curSequenceEnd = startSequence;
      curFlagStateIndex = -1;
    } else {
      startSequence = nextKey;
      curSequenceEnd = startSequence;
      returnString.AppendInt((int64_t)msgUids[keyIndex]);
      curFlagStateIndex = -1;
    }
    // check if we've generated too long a string - if there's no flag state,
    // it means we just need to go ahead and generate a too long string
    // because the calling code won't handle breaking up the strings.
    if (flagState && returnString.Length() > 950) {
      msgCount = keyIndex;
      break;
    }
    // If we are not the last item then we need to add the comma
    // but it's important we do it here, after the length check
    if (!lastKey) returnString += ',';
  }
}

void ParseUidString(const char* uidString, nsTArray<nsMsgKey>& keys) {
  // This is in the form <id>,<id>, or <id1>:<id2>
  if (!uidString) return;

  char curChar = *uidString;
  bool isRange = false;
  uint32_t curToken;
  uint32_t saveStartToken = 0;

  for (const char* curCharPtr = uidString; curChar && *curCharPtr;) {
    const char* currentKeyToken = curCharPtr;
    curChar = *curCharPtr;
    while (curChar != ':' && curChar != ',' && curChar != '\0')
      curChar = *curCharPtr++;

    // we don't need to null terminate currentKeyToken because strtoul
    // stops at non-numeric chars.
    curToken = strtoul(currentKeyToken, nullptr, 10);
    if (isRange) {
      while (saveStartToken < curToken) keys.AppendElement(saveStartToken++);
    }
    keys.AppendElement(curToken);
    isRange = (curChar == ':');
    if (isRange) saveStartToken = curToken + 1;
  }
}

void AppendUid(nsCString& msgIds, uint32_t uid) {
  char buf[20];
  PR_snprintf(buf, sizeof(buf), "%u", uid);
  msgIds.Append(buf);
}