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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim:set sw=4 sts=4 et cin: */
/* 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/. */


/*

  The converts a filesystem directory into an "HTTP index" stream per
  Lou Montulli's original spec:

  http://www.mozilla.org/projects/netlib/dirindexformat.html

 */

#include "nsEscape.h"
#include "nsDirectoryIndexStream.h"
#include "mozilla/Logging.h"
#include "prtime.h"
#include "nsISimpleEnumerator.h"
#ifdef THREADSAFE_I18N
#include "nsCollationCID.h"
#include "nsICollation.h"
#endif
#include "nsIFile.h"
#include "nsURLHelper.h"
#include "nsNativeCharsetUtils.h"

// NOTE: This runs on the _file transport_ thread.
// The problem is that now that we're actually doing something with the data,
// we want to do stuff like i18n sorting. However, none of the collation stuff
// is threadsafe.
// So THIS CODE IS ASCII ONLY!!!!!!!! This is no worse than the current
// behaviour, though. See bug 99382.
// When this is fixed, #define THREADSAFE_I18N to get this code working

//#define THREADSAFE_I18N

using namespace mozilla;
static LazyLogModule gLog("nsDirectoryIndexStream");

nsDirectoryIndexStream::nsDirectoryIndexStream()
    : mOffset(0), mStatus(NS_OK), mPos(0)
{
    MOZ_LOG(gLog, LogLevel::Debug,
           ("nsDirectoryIndexStream[%p]: created", this));
}

static int compare(nsIFile* aElement1, nsIFile* aElement2, void* aData)
{
    if (!NS_IsNativeUTF8()) {
        // don't check for errors, because we can't report them anyway
        nsAutoString name1, name2;
        aElement1->GetLeafName(name1);
        aElement2->GetLeafName(name2);

        // Note - we should do the collation to do sorting. Why don't we?
        // Because that is _slow_. Using TestProtocols to list file:///dev/
        // goes from 3 seconds to 22. (This may be why nsXULSortService is
        // so slow as well).
        // Does this have bad effects? Probably, but since nsXULTree appears
        // to use the raw RDF literal value as the sort key (which ammounts to an
        // strcmp), it won't be any worse, I think.
        // This could be made faster, by creating the keys once,
        // but CompareString could still be smarter - see bug 99383 - bbaetz
        // NB - 99393 has been WONTFIXed. So if the I18N code is ever made
        // threadsafe so that this matters, we'd have to pass through a
        // struct { nsIFile*, uint8_t* } with the pre-calculated key.
        return Compare(name1, name2);
    }

    nsAutoCString name1, name2;
    aElement1->GetNativeLeafName(name1);
    aElement2->GetNativeLeafName(name2);

    return Compare(name1, name2);
}

nsresult
nsDirectoryIndexStream::Init(nsIFile* aDir)
{
    nsresult rv;
    bool isDir;
    rv = aDir->IsDirectory(&isDir);
    if (NS_FAILED(rv)) return rv;
    NS_PRECONDITION(isDir, "not a directory");
    if (!isDir)
        return NS_ERROR_ILLEGAL_VALUE;

    if (MOZ_LOG_TEST(gLog, LogLevel::Debug)) {
        nsAutoCString path;
        aDir->GetNativePath(path);
        MOZ_LOG(gLog, LogLevel::Debug,
               ("nsDirectoryIndexStream[%p]: initialized on %s",
                this, path.get()));
    }

    // Sigh. We have to allocate on the heap because there are no
    // assignment operators defined.
    nsCOMPtr<nsISimpleEnumerator> iter;
    rv = aDir->GetDirectoryEntries(getter_AddRefs(iter));
    if (NS_FAILED(rv)) return rv;

    // Now lets sort, because clients expect it that way
    // XXX - should we do so here, or when the first item is requested?
    // XXX - use insertion sort instead?

    bool more;
    nsCOMPtr<nsISupports> elem;
    while (NS_SUCCEEDED(iter->HasMoreElements(&more)) && more) {
        rv = iter->GetNext(getter_AddRefs(elem));
        if (NS_SUCCEEDED(rv)) {
            nsCOMPtr<nsIFile> file = do_QueryInterface(elem);
            if (file)
                mArray.AppendObject(file); // addrefs
        }
    }

#ifdef THREADSAFE_I18N
    nsCOMPtr<nsICollationFactory> cf = do_CreateInstance(NS_COLLATIONFACTORY_CONTRACTID,
                                                         &rv);
    if (NS_FAILED(rv)) return rv;

    nsCOMPtr<nsICollation> coll;
    rv = cf->CreateCollation(getter_AddRefs(coll));
    if (NS_FAILED(rv)) return rv;

    mArray.Sort(compare, coll);
#else
    mArray.Sort(compare, nullptr);
#endif

    mBuf.AppendLiteral("300: ");
    nsAutoCString url;
    rv = net_GetURLSpecFromFile(aDir, url);
    if (NS_FAILED(rv)) return rv;
    mBuf.Append(url);
    mBuf.Append('\n');

    mBuf.AppendLiteral("200: filename content-length last-modified file-type\n");

    return NS_OK;
}

nsDirectoryIndexStream::~nsDirectoryIndexStream()
{
    MOZ_LOG(gLog, LogLevel::Debug,
           ("nsDirectoryIndexStream[%p]: destroyed", this));
}

nsresult
nsDirectoryIndexStream::Create(nsIFile* aDir, nsIInputStream** aResult)
{
    RefPtr<nsDirectoryIndexStream> result = new nsDirectoryIndexStream();
    if (! result)
        return NS_ERROR_OUT_OF_MEMORY;

    nsresult rv = result->Init(aDir);
    if (NS_FAILED(rv)) {
        return rv;
    }

    result.forget(aResult);
    return NS_OK;
}

NS_IMPL_ISUPPORTS(nsDirectoryIndexStream, nsIInputStream)

// The below routines are proxied to the UI thread!
NS_IMETHODIMP
nsDirectoryIndexStream::Close()
{
    mStatus = NS_BASE_STREAM_CLOSED;
    return NS_OK;
}

NS_IMETHODIMP
nsDirectoryIndexStream::Available(uint64_t* aLength)
{
    if (NS_FAILED(mStatus))
        return mStatus;

    // If there's data in our buffer, use that
    if (mOffset < (int32_t)mBuf.Length()) {
        *aLength = mBuf.Length() - mOffset;
        return NS_OK;
    }

    // Returning one byte is not ideal, but good enough
    *aLength = (mPos < mArray.Count()) ? 1 : 0;
    return NS_OK;
}

NS_IMETHODIMP
nsDirectoryIndexStream::Read(char* aBuf, uint32_t aCount, uint32_t* aReadCount)
{
    if (mStatus == NS_BASE_STREAM_CLOSED) {
        *aReadCount = 0;
        return NS_OK;
    }
    if (NS_FAILED(mStatus))
        return mStatus;

    uint32_t nread = 0;

    // If anything is enqueued (or left-over) in mBuf, then feed it to
    // the reader first.
    while (mOffset < (int32_t)mBuf.Length() && aCount != 0) {
        *(aBuf++) = char(mBuf.CharAt(mOffset++));
        --aCount;
        ++nread;
    }

    // Room left?
    if (aCount > 0) {
        mOffset = 0;
        mBuf.Truncate();

        // Okay, now we'll suck stuff off of our iterator into the mBuf...
        while (uint32_t(mBuf.Length()) < aCount) {
            bool more = mPos < mArray.Count();
            if (!more) break;

            // don't addref, for speed - an addref happened when it
            // was placed in the array, so it's not going to go stale
            nsIFile* current = mArray.ObjectAt(mPos);
            ++mPos;

            if (MOZ_LOG_TEST(gLog, LogLevel::Debug)) {
                nsAutoCString path;
                current->GetNativePath(path);
                MOZ_LOG(gLog, LogLevel::Debug,
                       ("nsDirectoryIndexStream[%p]: iterated %s",
                        this, path.get()));
            }

            // rjc: don't return hidden files/directories!
            // bbaetz: why not?
            nsresult rv;
#ifndef XP_UNIX
            bool hidden = false;
            current->IsHidden(&hidden);
            if (hidden) {
                MOZ_LOG(gLog, LogLevel::Debug,
                       ("nsDirectoryIndexStream[%p]: skipping hidden file/directory",
                        this));
                continue;
            }
#endif

            int64_t fileSize = 0;
            current->GetFileSize( &fileSize );

            PRTime fileInfoModifyTime = 0;
            current->GetLastModifiedTime( &fileInfoModifyTime );
            fileInfoModifyTime *= PR_USEC_PER_MSEC;

            mBuf.AppendLiteral("201: ");

            // The "filename" field
            if (!NS_IsNativeUTF8()) {
                nsAutoString leafname;
                rv = current->GetLeafName(leafname);
                if (NS_FAILED(rv)) return rv;

                nsAutoCString escaped;
                if (!leafname.IsEmpty() &&
                    NS_Escape(NS_ConvertUTF16toUTF8(leafname), escaped, url_Path)) {
                    mBuf.Append(escaped);
                    mBuf.Append(' ');
                }
            } else {
                nsAutoCString leafname;
                rv = current->GetNativeLeafName(leafname);
                if (NS_FAILED(rv)) return rv;

                nsAutoCString escaped;
                if (!leafname.IsEmpty() &&
                    NS_Escape(leafname, escaped, url_Path)) {
                    mBuf.Append(escaped);
                    mBuf.Append(' ');
                }
            }

            // The "content-length" field
            mBuf.AppendInt(fileSize, 10);
            mBuf.Append(' ');

            // The "last-modified" field
            PRExplodedTime tm;
            PR_ExplodeTime(fileInfoModifyTime, PR_GMTParameters, &tm);
            {
                char buf[64];
                PR_FormatTimeUSEnglish(buf, sizeof(buf), "%a,%%20%d%%20%b%%20%Y%%20%H:%M:%S%%20GMT ", &tm);
                mBuf.Append(buf);
            }

            // The "file-type" field
            bool isFile = true;
            current->IsFile(&isFile);
            if (isFile) {
                mBuf.AppendLiteral("FILE ");
            }
            else {
                bool isDir;
                rv = current->IsDirectory(&isDir);
                if (NS_FAILED(rv)) return rv; 
                if (isDir) {
                    mBuf.AppendLiteral("DIRECTORY ");
                }
                else {
                    bool isLink;
                    rv = current->IsSymlink(&isLink);
                    if (NS_FAILED(rv)) return rv; 
                    if (isLink) {
                        mBuf.AppendLiteral("SYMBOLIC-LINK ");
                    }
                }
            }

            mBuf.Append('\n');
        }

        // ...and once we've either run out of directory entries, or
        // filled up the buffer, then we'll push it to the reader.
        while (mOffset < (int32_t)mBuf.Length() && aCount != 0) {
            *(aBuf++) = char(mBuf.CharAt(mOffset++));
            --aCount;
            ++nread;
        }
    }

    *aReadCount = nread;
    return NS_OK;
}

NS_IMETHODIMP
nsDirectoryIndexStream::ReadSegments(nsWriteSegmentFun writer, void * closure, uint32_t count, uint32_t *_retval)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsDirectoryIndexStream::IsNonBlocking(bool *aNonBlocking)
{
    *aNonBlocking = false;
    return NS_OK;
}