/* bedGraphToBigWig - Convert a bedGraph program to bigWig.. */

/* Copyright (C) 2013 The Regents of the University of California 
 * See README in this or parent directory for licensing information. */
#include "common.h"
#include "obscure.h"
#include "memalloc.h"
#include "linefile.h"
#include "localmem.h"
#include "hash.h"
#include "options.h"
#include "sqlNum.h"
#include "dystring.h"
#include "cirTree.h"
#include "sig.h"
#include "zlibFace.h"
#include "bPlusTree.h"
#include "bbiFile.h"
#include "bwgInternal.h"
#include "bigWig.h"


static int blockSize = 256;
static int itemsPerSlot = 1024;
static boolean doCompress = FALSE;
static int maxGigs = 100;   // Maximum number of gigs to allocate in one block.  
			    // Undocumented on purpose.


void usage()
/* Explain usage and exit. */
{
errAbort(
  "bedGraphToBigWig v %d - Convert a bedGraph file to bigWig format.\n"
  "usage:\n"
  "   bedGraphToBigWig in.bedGraph chrom.sizes out.bw\n"
  "where in.bedGraph is a four column file in the format:\n"
  "      <chrom> <start> <end> <value>\n"
  "and chrom.sizes is a two-column file/URL: <chromosome name> <size in bases>\n"
  "and out.bw is the output indexed big wig file.\n"
  "If the assembly <db> is hosted by UCSC, chrom.sizes can be a URL like\n"
  "  http://hgdownload.soe.ucsc.edu/goldenPath/<db>/bigZips/<db>.chrom.sizes\n"
  "or you may use the script fetchChromSizes to download the chrom.sizes file.\n"
  "If not hosted by UCSC, a chrom.sizes file can be generated by running\n"
  "twoBitInfo on the assembly .2bit file.\n"
  "The input bedGraph file must be sorted, use the unix sort command:\n"
  "  sort -k1,1 -k2,2n unsorted.bedGraph > sorted.bedGraph\n"
  "options:\n"
  "   -blockSize=N - Number of items to bundle in r-tree.  Default %d\n"
  "   -itemsPerSlot=N - Number of data points bundled at lowest level. Default %d\n"
  "   -unc - If set, do not use compression."
  , bbiCurrentVersion, blockSize, itemsPerSlot
  );
}

static struct optionSpec options[] = {
   {"blockSize", OPTION_INT},
   {"itemsPerSlot", OPTION_INT},
   {"unc", OPTION_BOOLEAN},
   {"maxGigs", OPTION_INT},
   {NULL, 0},
};

struct sectionItem
/* An item in a section of a bedGraph. */
    {
    bits32 start, end;			/* Position in chromosome, half open. */
    float val;				/* Single precision value. */
    };

void writeSections(struct bbiChromUsage *usageList, struct lineFile *lf, 
	int itemsPerSlot, struct bbiBoundsArray *bounds, int sectionCount, FILE *f,
	int resTryCount, int resScales[], int resSizes[], 
	boolean doCompress, bits32 *retMaxSectionSize)
/* Read through lf, chunking it into sections that get written to f.  Save info
 * about sections in bounds. */
{
int maxSectionSize = 0;
struct bbiChromUsage *usage = usageList;
int itemIx = 0, sectionIx = 0;
bits32 reserved32 = 0;
UBYTE reserved8 = 0;
struct sectionItem items[itemsPerSlot];
struct sectionItem *lastB = NULL;
bits32 resEnds[resTryCount];
int resTry;
for (resTry = 0; resTry < resTryCount; ++resTry)
    resEnds[resTry] = 0;
struct dyString *stream = dyStringNew(0);

/* remove initial browser and track lines */
lineFileRemoveInitialCustomTrackLines(lf);

for (;;)
    {
    /* Get next line of input if any. */
    char *row[5];
    int rowSize = lineFileChopNext(lf, row, ArraySize(row));

    /* Figure out whether need to output section. */
    boolean sameChrom = FALSE;
    if (rowSize > 0)
	sameChrom = sameString(row[0], usage->name);
    if (itemIx >= itemsPerSlot || rowSize == 0 || !sameChrom)
        {
	/* Figure out section position. */
	bits32 chromId = usage->id;
	bits32 sectionStart = items[0].start;
	bits32 sectionEnd = items[itemIx-1].end;

	/* Save section info for indexing. */
	assert(sectionIx < sectionCount);
	struct bbiBoundsArray *section = &bounds[sectionIx++];
	section->offset = ftell(f);
	section->range.chromIx = chromId;
	section->range.start = sectionStart;
	section->range.end = sectionEnd;

	/* Output section header to stream. */
	dyStringClear(stream);
	UBYTE type = bwgTypeBedGraph;
	bits16 itemCount = itemIx;
	dyStringWriteOne(stream, chromId);			// chromId
	dyStringWriteOne(stream, sectionStart);		// start
	dyStringWriteOne(stream, sectionEnd);	// end
	dyStringWriteOne(stream, reserved32);		// itemStep
	dyStringWriteOne(stream, reserved32);		// itemSpan
	dyStringWriteOne(stream, type);			// type
	dyStringWriteOne(stream, reserved8);			// reserved
	dyStringWriteOne(stream, itemCount);			// itemCount

	/* Output each item in section to stream. */
	int i;
	for (i=0; i<itemIx; ++i)
	    {
	    struct sectionItem *item = &items[i];
	    dyStringWriteOne(stream, item->start);
	    dyStringWriteOne(stream, item->end);
	    dyStringWriteOne(stream, item->val);
	    }

	/* Save stream to file, compressing if need be. */
	if (stream->stringSize > maxSectionSize)
	    maxSectionSize = stream->stringSize;
	if (doCompress)
	    {
	    size_t maxCompSize = zCompBufSize(stream->stringSize);
	    char compBuf[maxCompSize];
	    int compSize = zCompress(stream->string, stream->stringSize, compBuf, maxCompSize);
	    mustWrite(f, compBuf, compSize);
	    }
	else
	    mustWrite(f, stream->string, stream->stringSize);


	/* If at end of input we are done. */
	if (rowSize == 0)
	    break;

	/* Set up for next section. */
	itemIx = 0;

	if (!sameChrom)
	    {
	    usage = usage->next;
	    assert(usage != NULL);
            if (!sameString(row[0], usage->name))
                errAbort("Error - read %s, expecting %s on line %d in file %s\n", 
                    row[0], usage->name, lf->lineIx, lf->fileName);
	    assert(sameString(row[0], usage->name));
	    lastB = NULL;
	    for (resTry = 0; resTry < resTryCount; ++resTry)
		resEnds[resTry] = 0;
	    }
	}

    /* Parse out input. */
    lineFileExpectWords(lf, 4, rowSize);
    bits32 start = lineFileNeedNum(lf, row, 1);
    bits32 end = lineFileNeedNum(lf, row, 2);
    float val = lineFileNeedDouble(lf, row, 3);

    /* Verify that inputs meets our assumption - that it is a sorted bedGraph file. */
    if (start > end)
        errAbort("Error - start (%u) after end (%u) line %d of %s", start, end, lf->lineIx, lf->fileName);
    if (lastB != NULL)
        {
	if (lastB->start > start)
	    errAbort("Error - bedGraph not sorted on start line %d of %s", lf->lineIx, lf->fileName);
	if (lastB->end > start)
	    errAbort("Error - overlapping regions in bedGraph line %d of %s", lf->lineIx, lf->fileName);
	}


    /* Do zoom counting. */
    for (resTry = 0; resTry < resTryCount; ++resTry)
        {
	bits32 resEnd = resEnds[resTry];
	if (start >= resEnd)
	    {
	    resSizes[resTry] += 1;
	    resEnds[resTry] = resEnd = start + resScales[resTry];
	    }
	while (end > resEnd)
	    {
	    resSizes[resTry] += 1;
	    resEnds[resTry] = resEnd = resEnd + resScales[resTry];
	    }
	}

    /* Save values in output array. */
    struct sectionItem *b = &items[itemIx];
    b->start = start;
    b->end = end;
    b->val = val;
    lastB = b;
    itemIx += 1;
    }
assert(sectionIx == sectionCount);

*retMaxSectionSize = maxSectionSize;
}

static struct bbiSummary *bedGraphWriteReducedOnceReturnReducedTwice(struct bbiChromUsage *usageList, 
	int fieldCount, struct lineFile *lf, bits32 initialReduction, bits32 initialReductionCount, 
	int zoomIncrement, int blockSize, int itemsPerSlot, boolean doCompress,
	struct lm *lm, FILE *f, bits64 *retDataStart, bits64 *retIndexStart,
	struct bbiSummaryElement *totalSum)
/* Write out data reduced by factor of initialReduction.  Also calculate and keep in memory
 * next reduction level.  This is more work than some ways, but it keeps us from having to
 * keep the first reduction entirely in memory. */
{
struct bbiSummary *twiceReducedList = NULL;
bits32 doubleReductionSize = initialReduction * zoomIncrement;
struct bbiChromUsage *usage = usageList;
struct bbiSummary oneSummary, *sum = NULL;
struct bbiBoundsArray *boundsArray, *boundsPt, *boundsEnd;
boundsPt = AllocArray(boundsArray, initialReductionCount);
boundsEnd = boundsPt + initialReductionCount;

*retDataStart = ftell(f);
writeOne(f, initialReductionCount);
boolean firstRow = TRUE;

struct bbiSumOutStream *stream = bbiSumOutStreamOpen(itemsPerSlot, f, doCompress);

/* remove initial browser and track lines */
lineFileRemoveInitialCustomTrackLines(lf);

for (;;)
    {
    /* Get next line of input if any. */
    char *row[5];
    int rowSize = lineFileChopNext(lf, row, ArraySize(row));

    /* Output last section and break if at end of file. */
    if (rowSize == 0 && sum != NULL)
	{
	bbiOutputOneSummaryFurtherReduce(sum, &twiceReducedList, doubleReductionSize, 
		&boundsPt, boundsEnd, lm, stream);
	break;
	}

    /* Parse out row. */
    char *chrom = row[0];
    bits32 start = sqlUnsigned(row[1]);
    bits32 end = sqlUnsigned(row[2]);
    float val = sqlFloat(row[3]);

    /* Update total summary stuff. */
    bits32 size = end-start;
    if (firstRow)
	{
        totalSum->validCount = size;
	totalSum->minVal = totalSum->maxVal = val;
	totalSum->sumData = val*size;
	totalSum->sumSquares = val*val*size;
	firstRow = FALSE;
	}
    else
        {
	totalSum->validCount += size;
	if (val < totalSum->minVal) totalSum->minVal = val;
	if (val > totalSum->maxVal) totalSum->maxVal = val;
	totalSum->sumData += val*size;
	totalSum->sumSquares += val*val*size;
	}

    /* If new chromosome output existing block. */
    if (differentString(chrom, usage->name))
        {
	usage = usage->next;
	bbiOutputOneSummaryFurtherReduce(sum, &twiceReducedList, doubleReductionSize,
		&boundsPt, boundsEnd, lm, stream);
	sum = NULL;
	}

    /* If start past existing block then output it. */
    else if (sum != NULL && sum->end <= start)
	{
	bbiOutputOneSummaryFurtherReduce(sum, &twiceReducedList, doubleReductionSize, 
		&boundsPt, boundsEnd, lm, stream);
	sum = NULL;
	}

    /* If don't have a summary we're working on now, make one. */
    if (sum == NULL)
        {
	oneSummary.chromId = usage->id;
	oneSummary.start = start;
	oneSummary.end = start + initialReduction;
	if (oneSummary.end > usage->size) oneSummary.end = usage->size;
	oneSummary.minVal = oneSummary.maxVal = val;
	oneSummary.sumData = oneSummary.sumSquares = 0.0;
	oneSummary.validCount = 0;
	sum = &oneSummary;
	}
    
    /* Deal with case where might have to split an item between multiple summaries.  This
     * loop handles all but the final affected summary in that case. */
    while (end > sum->end)
        {
	verbose(3, "Splitting start %d, end %d, sum->start %d, sum->end %d\n", start, end, sum->start, sum->end);
	/* Fold in bits that overlap with existing summary and output. */
	bits32 overlap = rangeIntersection(start, end, sum->start, sum->end);
	sum->validCount += overlap;
	if (sum->minVal > val) sum->minVal = val;
	if (sum->maxVal < val) sum->maxVal = val;
	sum->sumData += val * overlap;
	sum->sumSquares += val*val * overlap;
	bbiOutputOneSummaryFurtherReduce(sum, &twiceReducedList, doubleReductionSize, 
		&boundsPt, boundsEnd, lm, stream);
	size -= overlap;

	/* Move summary to next part. */
	sum->start = start = sum->end;
	sum->end = start + initialReduction;
	if (sum->end > usage->size) sum->end = usage->size;
	sum->minVal = sum->maxVal = val;
	sum->sumData = sum->sumSquares = 0.0;
	sum->validCount = 0;
	}

    /* Add to summary. */
    sum->validCount += size;
    if (sum->minVal > val) sum->minVal = val;
    if (sum->maxVal < val) sum->maxVal = val;
    sum->sumData += val * size;
    sum->sumSquares += val*val * size;
    }
bbiSumOutStreamClose(&stream);

/* Write out 1st zoom index. */
int indexOffset = *retIndexStart = ftell(f);
assert(boundsPt == boundsEnd);
cirTreeFileBulkIndexToOpenFile(boundsArray, sizeof(boundsArray[0]), initialReductionCount,
    blockSize, itemsPerSlot, NULL, bbiBoundsArrayFetchKey, bbiBoundsArrayFetchOffset, 
    indexOffset, f);

freez(&boundsArray);
slReverse(&twiceReducedList);
return twiceReducedList;
}

void bedGraphToBigWig(char *inName, char *chromSizes, char *outName)
/* bedGraphToBigWig - Convert a bedGraph program to bigWig.. */
{
verboseTimeInit();
struct lineFile *lf = lineFileOpen(inName, TRUE);
struct hash *chromSizesHash = bbiChromSizesFromFile(chromSizes);
verbose(2, "%d chroms in %s\n", chromSizesHash->elCount, chromSizes);
int minDiff = 0, i;
double aveSize = 0;
bits64 bedCount = 0;
bits32 uncompressBufSize = 0;
struct bbiChromUsage *usageList = bbiChromUsageFromBedFile(lf, chromSizesHash, NULL, 
    &minDiff, &aveSize, &bedCount, FALSE);
verboseTime(2, "pass1");
verbose(2, "%d chroms in %s, minDiff=%d, aveSize=%g, bedCount=%lld\n", 
    slCount(usageList), inName, minDiff, aveSize, bedCount);

/* Write out dummy header, zoom offsets. */
FILE *f = mustOpen(outName, "wb");
bbiWriteDummyHeader(f);
bbiWriteDummyZooms(f);

/* Write out dummy total summary. */
struct bbiSummaryElement totalSum;
ZeroVar(&totalSum);
bits64 totalSummaryOffset = ftell(f);
bbiSummaryElementWrite(f, &totalSum);

/* Write out chromosome/size database. */
bits64 chromTreeOffset = ftell(f);
bbiWriteChromInfo(usageList, blockSize, f);

/* Set up to keep track of possible initial reduction levels. */
int resScales[bbiMaxZoomLevels], resSizes[bbiMaxZoomLevels];
int resTryCount = bbiCalcResScalesAndSizes(aveSize, resScales, resSizes);

/* Write out primary full resolution data in sections, collect stats to use for reductions. */
bits64 dataOffset = ftell(f);
bits64 sectionCount = bbiCountSectionsNeeded(usageList, itemsPerSlot);
writeOne(f, sectionCount);
struct bbiBoundsArray *boundsArray;
AllocArray(boundsArray, sectionCount);
lineFileRewind(lf);
bits32 maxSectionSize = 0;
writeSections(usageList, lf, itemsPerSlot, boundsArray, sectionCount, f,
	resTryCount, resScales, resSizes, doCompress, &maxSectionSize);
verboseTime(2, "pass2");

/* Write out primary data index. */
bits64 indexOffset = ftell(f);
cirTreeFileBulkIndexToOpenFile(boundsArray, sizeof(boundsArray[0]), sectionCount,
    blockSize, 1, NULL, bbiBoundsArrayFetchKey, bbiBoundsArrayFetchOffset, 
    indexOffset, f);
verboseTime(2, "index write");

/* Declare arrays and vars that track the zoom levels we actually output. */
bits32 zoomAmounts[bbiMaxZoomLevels];
bits64 zoomDataOffsets[bbiMaxZoomLevels];
bits64 zoomIndexOffsets[bbiMaxZoomLevels];

/* Call monster zoom maker library function that bedToBigBed also uses. */
int zoomLevels = bbiWriteZoomLevels(lf, f, blockSize, itemsPerSlot,
    bedGraphWriteReducedOnceReturnReducedTwice, 4,
    doCompress, indexOffset - dataOffset, 
    usageList, resTryCount, resScales, resSizes, 
    zoomAmounts, zoomDataOffsets, zoomIndexOffsets, &totalSum);


/* Figure out buffer size needed for uncompression if need be. */
if (doCompress)
    {
    int maxZoomUncompSize = itemsPerSlot * sizeof(struct bbiSummaryOnDisk);
    uncompressBufSize = max(maxSectionSize, maxZoomUncompSize);
    }

/* Go back and rewrite header. */
rewind(f);
bits32 sig = bigWigSig;
bits16 version = bbiCurrentVersion;
bits16 summaryCount = zoomLevels;
bits16 reserved16 = 0;
bits32 reserved32 = 0;
bits64 reserved64 = 0;

/* Write fixed header */
writeOne(f, sig);
writeOne(f, version);
writeOne(f, summaryCount);
writeOne(f, chromTreeOffset);
writeOne(f, dataOffset);
writeOne(f, indexOffset);
writeOne(f, reserved16);	// fieldCount
writeOne(f, reserved16);	// definedFieldCount
writeOne(f, reserved64);	// autoSqlOffset
writeOne(f, totalSummaryOffset);
writeOne(f, uncompressBufSize);
writeOne(f, reserved64);	// nameIndexOffset
assert(ftell(f) == 64);

/* Write summary headers with data. */
verbose(2, "Writing %d levels of zoom\n", zoomLevels);
for (i=0; i<zoomLevels; ++i)
    {
    verbose(3, "zoomAmounts[%d] = %d\n", i, (int)zoomAmounts[i]);
    writeOne(f, zoomAmounts[i]);
    writeOne(f, reserved32);
    writeOne(f, zoomDataOffsets[i]);
    writeOne(f, zoomIndexOffsets[i]);
    }
/* Write rest of summary headers with no data. */
for (i=zoomLevels; i<bbiMaxZoomLevels; ++i)
    {
    writeOne(f, reserved32);
    writeOne(f, reserved32);
    writeOne(f, reserved64);
    writeOne(f, reserved64);
    }

/* Write total summary. */
fseek(f, totalSummaryOffset, SEEK_SET);
bbiSummaryElementWrite(f, &totalSum);

/* Write end signature. */
fseek(f, 0L, SEEK_END);
writeOne(f, sig);

lineFileClose(&lf);
carefulClose(&f);
}

int main(int argc, char *argv[])
/* Process command line. */
{
optionInit(&argc, argv, options);
maxGigs = optionInt("maxGigs", maxGigs);
setMaxAlloc(maxGigs*1000000000L);  
blockSize = optionInt("blockSize", blockSize);
itemsPerSlot = optionInt("itemsPerSlot", itemsPerSlot);
doCompress = !optionExists("unc");
if (argc != 4)
    usage();
bedGraphToBigWig(argv[1], argv[2], argv[3]);
if (verboseLevel() > 1)
    printVmPeak();
return 0;
}
