import os
import subprocess
from subprocess import CalledProcessError, check_call
from mapdamage.version import __version__
import mapdamage
import logging
import time


def construct_path(name,folder="Rscripts"):
    """Construct a path to the mapdamage package data given the name"""
    return(os.path.join(mapdamage.__path__[0], folder, name))

def plot(opt):
  """
  Calls the R script to make the plots, takes in the arguments
  from parameter processing
  """
  # comp<-args[1]
  # pdfout<-args[2]
  # around<-as.numeric(args[3])
  # misincorp<-args[4]
  # lg<-as.numeric(args[5])
  # ymax<-as.numeric(args[6])
  # folder<-args[7]
  # title<-args[8]
  # version<-args[9]

  fmut = opt.folder+"/"+"misincorporation.txt"
  fcomp = opt.folder+"/"+"dnacomp.txt"
  title = opt.folder+"/"+"Fragmisincorporation_plot.pdf"

  script = construct_path("mapDamage.R")
  call = ["Rscript", script, fcomp, title, opt.refplot, fmut, opt.readplot, \
      opt.ymax, opt.folder, opt.title, __version__]
  code = subprocess.call(list(map(str, call)))

  if code == 0:
    if not opt.quiet:
      print(("pdf %s generated" % title))
    return 0
  else:
    print("Error: plotting with R failed")
    return 1



def opt_plots(opt):
  """ optional plots for length distribution
  and cumulative C>T mutations, per strand """

  fmut = opt.folder+"/"+"misincorporation.txt"
  flength = opt.folder+"/"+"lgdistribution.txt"
  output = opt.folder+"/"+"Length_plot.pdf"

  script = construct_path("lengths.R")
  call = ["Rscript", script, flength, output, fmut, opt.length, \
      opt.title, __version__, bool_to_int(opt.quiet)]
  code = subprocess.call(list(map(str, call)))
  if code == 0:
    return 0
  else:
    print("Error: plotting with R failed")
    return 1


def check_R_one_lib(name):
    """Checks if a necessary R library is here."""
    with open(os.devnull, "w") as devnull:
        rpa = construct_path("stats/checkLibraries.R")
        return subprocess.call(["Rscript", rpa, "--args", name],
                               stdout = devnull,
                               stderr = devnull)


def check_R_lib():
    """
    Checks if the necessary R libraries are here, signal
    otherwise
    """
    libs = ["inline", "ggplot2", "gam", "Rcpp", "RcppGSL"]
    missing_lib = []
    for lib in libs:
        # Check the libraries
        if check_R_one_lib(lib):
            #found a missing library
            missing_lib.append(lib)
    if len(missing_lib) > 1:
        # Grammar Nazi has arrived
        last_ele = missing_lib.pop()
        print(("Missing the following R libraries '" + "', '".join(missing_lib) \
            + "' and '" + last_ele + "'"))
        return 1
    elif len(missing_lib) == 1:
        print(("Missing the following R library "+missing_lib[0]))
        return 1
    else :
        # No missing libraries
        return 0


def run_stats(opt):
    """
    Runs the Bayesian estimation program, using the options opt
    """
    arg = ["Rscript",                            \
         construct_path("stats/runGeneral.R"), \
         "--args",                               \
         opt.rand,                               \
         opt.burn,                               \
         opt.adjust,                             \
         opt.iter,                               \
         bool_to_int(opt.forward),               \
         bool_to_int(opt.reverse),               \
         bool_to_int(not opt.var_disp),              \
         bool_to_int(not opt.diff_hangs),            \
         0,                                      \
         bool_to_int(opt.fix_nicks),             \
         bool_to_int(not opt.single_stranded),       \
         opt.seq_length,                         \
         opt.folder+"/",                         \
         construct_path("stats/"),             \
         opt.folder+"/Stats_out",                \
         int(opt.verbose),                       \
         int(opt.quiet),                         \
         int(opt.jukes_cantor),                       \
         opt.folder+"/acgt_ratio.csv",            \
         int(opt.use_raw_nick_freq),                   \
         int(opt.theme_bw)                   \
         ]
    arg = [str(i) for i in arg]

    logger = logging.getLogger(__name__)
    logger.info("Performing Bayesian estimates")
    logger.debug("Call: %s" % (" ".join(arg),))
    start_time = time.time()

    try:
        check_call(arg)
    except CalledProcessError as e:
        logger.error("The Bayesian statistics program failed to finish")
        raise e

    logger.debug("Bayesian estimates completed in %f seconds" % (time.time() - start_time,))
    return 0


def bool_to_int(boolean):
    """ return 0 for False and 1 for True """
    result = 1 if boolean else 0
    return result