#! /usr/bin/env python
#
# Copyright INRA-URGI 2009-2012
# 
# This software is governed by the CeCILL license under French law and
# abiding by the rules of distribution of free software. You can use,
# modify and/ or redistribute the software under the terms of the CeCILL
# license as circulated by CEA, CNRS and INRIA at the following URL
# "http://www.cecill.info".
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import os
from optparse import OptionParser
from commons.core.parsing.ParserChooser import ParserChooser
from commons.core.parsing.FastaParser import FastaParser
from SMART.Java.Python.structure.Transcript import Transcript
from commons.core.writer.Gff3Writer import Gff3Writer
from SMART.Java.Python.misc.RPlotter import RPlotter
from SMART.Java.Python.misc.MultipleRPlotter import MultipleRPlotter
from SMART.Java.Python.misc.UnlimitedProgress import UnlimitedProgress
from SMART.Java.Python.misc.Progress import Progress

TWOSTRANDS = {True: [1, -1], False: [0]}
STRANDTOSTR = {1: "(+)", -1: "(-)", 0: ""}

class GetDistribution(object):

	def __init__(self, verbosity):
		self.verbosity     = verbosity
		self.sizes         = None
		self.twoStrands    = False
		self.start         = 1
		self.names         = ["nbElements"]
		self.average       = False
		self.nbValues      = {}
		self.height        = 300
		self.width         = 600
		self.colors        = None
		self.gffFileName   = None
		self.csvFileName   = None
		self.yMin          = None
		self.yMax          = None
		self.chromosome    = None
		self.merge         = False
		self.nbTranscripts = None

	def setInputFile(self, fileName, format):
		chooser = ParserChooser(self.verbosity)
		chooser.findFormat(format)
		self.parser = chooser.getParser(fileName)

	def setReferenceFile(self, fileName):
		if fileName == None:
			return
		fastaParser = FastaParser(fileName, self.verbosity)
		self.chromosomes = fastaParser.getRegions()
		self.sizes       = dict([region, fastaParser.getSizeOfRegion(region)] for region in self.chromosomes)
		self.maxSize     = max(self.sizes.values())

	def setRegion(self, chromosome, start, end):
		if chromosome == None:
			return
		self.maxSize     = options.end
		self.sizes       = {chromosome: end}
		self.chromosomes = [chromosome]
		self.chromosome  = chromosome
		self.start       = start
		self.end         = end

	def setOutputFile(self, fileName):
		self.outputFileName = fileName

	def setNbBins(self, nbBins):
		self.nbBins = nbBins

	def set2Strands(self, twoStrands):
		self.twoStrands = twoStrands

	def setNames(self, names):
		self.names = names

	def setAverage(self, average):
		self.average = average

	def setNormalization(self, normalization):
		self.normalization = normalization
	
	def setImageSize(self, height, width):
		self.height = height
		self.width  = width

	def setYLimits(self, yMin, yMax):
		self.yMin = yMin
		self.yMax = yMax

	def setColors(self, colors):
		self.colors = colors

	def writeGff(self, fileName):
		self.gffFileName = fileName

	def writeCsv(self, fileName):
		self.csvFileName = fileName

	def mergePlots(self, merge):
		self.merge = merge

	def _estimateSizes(self):
		progress = UnlimitedProgress(10000, "Reading input for chromosome size estimate", self.verbosity)
		self.sizes = {}
		for self.nbTranscripts, transcript in enumerate(self.parser.getIterator()):
			chromosome = transcript.getChromosome()
			start      = transcript.getStart()
			self.sizes[chromosome] = max(start, self.sizes.get(chromosome, 0))
			progress.inc()
		progress.done()

	def _computeSliceSize(self):
		if self.nbBins == 0:
			return
		tmp1           = int(max(self.sizes.values()) / float(self.nbBins))
		tmp2           = 10 ** (len("%d" % (tmp1))-2)
		self.sliceSize = max(1, int((tmp1 / tmp2) * tmp2))
		if self.verbosity > 0:
			print "choosing bin size of %d" % (self.sliceSize)

	def _initBins(self):
		self.bins = {}
		for chromosome in self.sizes:
			self.bins[chromosome] = {}
			for name in self.names:
				self.bins[chromosome][name] = {}
				for strand in TWOSTRANDS[self.twoStrands]:
					if self.nbBins == 0:
						self.bins[chromosome][name][strand] = {}
					else:
						self.bins[chromosome][name][strand] = dict([(i * self.sliceSize + 1, 0.0) for i in range(self.start / self.sliceSize, self.sizes[chromosome] / self.sliceSize + 1)])

	def _populateBins(self):
		if self.nbTranscripts == None:
			progress = UnlimitedProgress(10000, "Counting data", self.verbosity)
		else:
			progress = Progress(self.nbTranscripts, "Counting data", self.verbosity)
		for transcript in self.parser.getIterator():
			if transcript.__class__.__name__ == "Mapping":
				transcript = transcript.getTranscript()
			progress.inc()
			chromosome = transcript.getChromosome()
			start      = transcript.getStart()
			if self.chromosome and (chromosome != self.chromosome or start < self.start or start > self.end):
				continue
			strand = transcript.getDirection() if self.twoStrands else 0
			if self.nbBins != 0:
				bin = (start / self.sliceSize) * self.sliceSize + 1
			else:
				bin = start
			for name in self.names:
				value = float(transcript.tags.get(name, 1))
				self.bins[chromosome][name][strand][bin] = self.bins[chromosome][name][strand].get(bin, 0) + value
				self.nbValues[name] = self.nbValues.get(name, 0) + value
		progress.done()

	def _normalize(self):
		average = float(sum(self.nbValues)) / len(self.nbValues.keys())
		factors = dict([name, float(average) / self.nbValues[name]] for name in self.nbValues)
		for chromosome in self.bins:
			for name in self.bins[chromosome]:
				for strand in self.bins[chromosome][name]:
					for bin in self.bins[chromosome][name][strand]:
						self.bins[chromosome][name][strand][bin] *= factors[name]

	def _computeAverage(self):
		for chromosome in self.bins:
			for name in self.bins[chromosome]:
				for strand in self.bins[chromosome][name]:
					for bin in self.bins[chromosome][name][strand]:
						self.bins[chromosome][name][strand][bin] = float(self.bins[chromosome][name][strand][bin]) / self.sliceSize

	def _getPlotter(self, chromosome):
		plot = RPlotter("%s_%s.png" % (os.path.splitext(self.outputFileName)[0], chromosome), self.verbosity)
		plot.setImageSize(self.width, self.height)
		if self.sizes[chromosome] <= 1000:
			unit  = "nt."
			ratio = 1.0
		elif self.sizes[chromosome] <= 1000000:
			unit  = "kb"
			ratio = 1000.0
		else:
			unit  = "Mb"
			ratio = 1000000.0
		if self.yMin != None:
			plot.setMinimumY(self.yMin)
		if self.yMax != None:
			plot.setMaximumY(self.yMax)
		plot.setXLabel("Position on %s (in %s)" % (chromosome.replace("_", " "), unit))
		plot.setLegend(True)
		for i, name in enumerate(self.bins[chromosome]):
			for strand in self.bins[chromosome][name]:
				fullName = "%s %s" % (name.replace("_", " ")[:6], STRANDTOSTR[strand])
				factor = 1 if strand == 0 else strand
				correctedLine = dict([(key / ratio, value * factor) for key, value in self.bins[chromosome][name][strand].iteritems()])
				plot.addLine(correctedLine, fullName, self.colors[i] if self.colors else None)
		return plot

	def _plot(self):
		if self.merge:
			multiplePlot = MultipleRPlotter(self.outputFileName, self.verbosity)
			multiplePlot.setImageSize(self.width, self.height * len(self.bins.keys()))
		progress = Progress(len(self.bins.keys()), "Plotting", options.verbosity)
		for chromosome in sorted(self.bins.keys()):
			plot = self._getPlotter(chromosome)
			if self.merge:
				multiplePlot.addPlot(plot)
			else:
				plot.plot()
			progress.inc()
		if self.merge:
			multiplePlot.plot()
		progress.done()

	def _writeCsv(self):
		if self.verbosity > 1:
			print "Writing CSV file..."
		csvHandle = open(self.csvFileName, "w")
		csvHandle.write("chromosome;tag;strand")
		if self.nbBins != 0:
			xValues = range(self.start / self.sliceSize, max(self.sizes.values()) / self.sliceSize + 1)
			for value in xValues:
				csvHandle.write(";%d-%d" % (value * self.sliceSize + 1, (value+1) * self.sliceSize))
			csvHandle.write("\n")
		else:
			xValues = []
			for chromosome in self.bins:
				for name in self.bins[chromosome]:
					for strand in self.bins[chromosome][name]:
						for bin in self.bins[chromosome][name][strand]:
							xValues.extend(self.bins[chromosome][name][strand].keys())
			xValues = sorted(list(set(xValues)))
			for value in xValues:
				csvHandle.write(";%d" % (value))
			csvHandle.write("\n")
		for chromosome in self.bins:
			csvHandle.write("%s" % (chromosome))
			for name in self.bins[chromosome]:
				csvHandle.write(";%s" % (name))
				for strand in self.bins[chromosome][name]:
					csvHandle.write(";%s" % (STRANDTOSTR[strand]))
					for bin in xValues:
						csvHandle.write(";%.2f" % (self.bins[chromosome][name][strand].get(bin, 0)))
					csvHandle.write("\n")
				csvHandle.write(";")
			csvHandle.write(";")
		csvHandle.close()
		if self.verbosity > 1:
			print "...done"
		
	def _writeGff(self):
		if self.verbosity > 1:
			print "Writing GFF file..."
		writer = Gff3Writer(self.gffFileName, self.verbosity)
		cpt    = 1
		for chromosome in self.bins:
			for name in self.bins[chromosome]:
				for strand in self.bins[chromosome][name]:
					for bin in self.bins[chromosome][name][strand]:
						transcript = Transcript()
						transcript.setChromosome(chromosome)
						transcript.setStart(bin)
						if self.nbBins > 0:
							transcript.setEnd(bin + self.sliceSize)
						else:
							transcript.setEnd(start)
						transcript.setDirection(1 if strand == 0 else strand)
						transcript.setTagValue("ID", "region%d" % (cpt))
						cpt += 1
		writer.write()
		if self.verbosity > 1:
			print "...done"

	def run(self):
		if self.sizes == None:
			self._estimateSizes()
		self._computeSliceSize()
		self._initBins()
		self._populateBins()
		if self.normalization:
			self._normalize()
		if self.average:
			self._computeAverage()
		self._plot()
		if self.csvFileName != None:
			self._writeCsv()
		if self.gffFileName != None:
			self._writeGff()


if __name__ == "__main__":

	description = "Get Distribution v1.0.2: Get the distribution of the genomic coordinates on a genome. [Category: Visualization]"

	parser = OptionParser(description = description)
	parser.add_option("-i", "--input",       dest="inputFileName",     action="store",                            type="string", help="input file [compulsory] [format: file in transcript format given by -f]")
	parser.add_option("-f", "--format",      dest="format",            action="store",                            type="string", help="format of the input file [compulsory] [format: transcript file format]")
	parser.add_option("-o", "--output",      dest="outputFileName",    action="store",                            type="string", help="output file [compulsory] [format: output file in GFF3 format]")
	parser.add_option("-r", "--reference",   dest="referenceFileName", action="store",      default=None,         type="string", help="file containing the genome [format: file in FASTA format]")
	parser.add_option("-b", "--nbBins",      dest="nbBins",            action="store",      default=1000,         type="int",    help="number of bins [default: 1000] [format: int]")
	parser.add_option("-2", "--bothStrands", dest="bothStrands",       action="store_true", default=False,                       help="plot one curve per strand [format: bool] [default: false]")
	parser.add_option("-c", "--chromosome",  dest="chromosome",        action="store",      default=None,         type="string", help="plot only a chromosome [format: string]")
	parser.add_option("-s", "--start",       dest="start",             action="store",      default=None,         type="int",    help="start from a given region [format: int]")
	parser.add_option("-e", "--end",         dest="end",               action="store",      default=None,         type="int",    help="end from a given region [format: int]")
	parser.add_option("-y", "--yMin",        dest="yMin",              action="store",      default=None,         type="int",    help="minimum value on the y-axis to plot [format: int]")
	parser.add_option("-Y", "--yMax",        dest="yMax",              action="store",      default=None,         type="int",    help="maximum value on the y-axis to plot [format: int]")
	parser.add_option("-x", "--csv",         dest="csv",               action="store",      default=None,                        help="write a .csv file [format: output file in CSV format] [default: None]")
	parser.add_option("-g", "--gff",         dest="gff",               action="store",      default=None,                        help="also write GFF3 file [format: output file in GFF format] [default: None]")
	parser.add_option("-H", "--height",      dest="height",            action="store",      default=300,          type="int",    help="height of the graphics [format: int] [default: 300]")
	parser.add_option("-W", "--width",       dest="width",             action="store",      default=600,          type="int",    help="width of the graphics [format: int] [default: 1000]")
	parser.add_option("-a", "--average",     dest="average",           action="store_true", default=False,                       help="plot average (instead of sum) [default: false] [format: boolean]")
	parser.add_option("-n", "--names",       dest="names",             action="store",      default="nbElements", type="string", help="name for the tags (separated by commas and no space) [default: None] [format: string]")
	parser.add_option("-l", "--color",       dest="colors",            action="store",      default=None,         type="string", help="color of the lines (separated by commas and no space) [format: string]")
	parser.add_option("-z", "--normalize",   dest="normalize",         action="store_true", default=False,                       help="normalize data (when panels are different) [format: bool] [default: false]")
	parser.add_option("-m", "--merge",       dest="mergePlots",        action="store_true", default=False,                       help="merge all plots in one figure [format: bool] [default: false]")
	parser.add_option("-v", "--verbosity",   dest="verbosity",         action="store",      default=1,            type="int",    help="trace level [default: 1] [format: int]")
	(options, args) = parser.parse_args()

	gt = GetDistribution(options.verbosity)
	gt.setInputFile(options.inputFileName, options.format)
	gt.setOutputFile(options.outputFileName)
	gt.setReferenceFile(options.referenceFileName)
	gt.setNbBins(int(options.nbBins))
	gt.set2Strands(options.bothStrands)
	gt.setRegion(options.chromosome, options.start, options.end)
	gt.setNormalization(options.normalize)
	gt.setAverage(options.average)
	gt.setYLimits(options.yMin, options.yMax)
	gt.writeCsv(options.csv)
	gt.writeGff(options.gff)
	gt.setImageSize(options.height, options.width)
	gt.setNames(options.names.split(","))
	gt.setColors(None if options.colors == None else options.colors.split(","))
	gt.setNormalization(options.normalize)
	gt.mergePlots(options.mergePlots)
	gt.run()