import argparse
import os
import subprocess
from getSegmentsCoordinates import seg_coord

def dir_path(path):
    if os.path.isdir(path):
        return path
    else:
        raise argparse.ArgumentTypeError(f"readable_dir:{path} is not a valid path")
        
def arg():
    parser = argparse.ArgumentParser(prog='GrAnnoT',description='Annotation transfer between genome and pangenome graph.')

    # input options
        
    # input files
    parser.add_argument('graph', metavar='graph.gfa', type=argparse.FileType('r'), help='pangenome graph file in GFA format containing the genome that the annotation refers to and the target genome.s')
    parser.add_argument('gff', metavar='annotation.gff', type=argparse.FileType('r') ,help='annotation file in GFF format containing the annotations to be transfered')

    # optionnal input file
    parser.add_argument('-coord', '--segment_coordinates_path', metavar="path/to/files", type=dir_path, default=".", help="path to the files given by the preprocessing of the graph; if not given the program will do the preprocessing; recommended if the program will run several times")

    # genome names
    parser.add_argument('source_genome', metavar="source_genome", type=str, help="name of the annotated genome's path in the GFA (field ? in the W line), that the annotation file refers to")
    parser.add_argument('-t', '--target', metavar="target_genome", nargs='*', type=str, default=[], help="name of the target genomes' paths in the GFA (field ? in the W line) for the annotation; if the option is not used the programm will transfer the annotation on all the genomes")



    # graph annotation options
    parser.add_argument('-gff','--graph_gff',help="output the annotation of the graph in GFF format",action='store_true')
    parser.add_argument('-gaf','--graph_gaf',help="output the annotation of the graph in GAF format",action='store_true')

    # genome annotation options
    parser.add_argument('-ann','--annotation',help="output the annotation transfer in GFF format",action='store_true')
    parser.add_argument('-var','--variation',help="output the detail of the variations for the transfered features",action='store_true')
    parser.add_argument('-aln','--alignment',help="output the alignment of the transfered features",action='store_true')

    # annotation transfer options
    parser.add_argument('-id', '--identity', metavar="N", type=int, help="minimum identity percentage required for the feature to be transfered")
    parser.add_argument('-cov', '--coverage', metavar="N", type=int, help="minimum coverage percentage required for the feature to be transfered")
    parser.add_argument('-diff', '--max_difference', metavar="N", type=int, help="maximum difference accepted for the feature to be transfered (transfer rejected if the feature size on the target genome is N times bigger or smaller than on the source genome)")



    # version
    parser.add_argument('--version', action='version', version='%(prog)s 0.1')

    return parser.parse_args()

def read_args(args):
    path_list=args.target[:]
    path_list.append(args.source_genome)
    if args.segment_coordinates_path==".":
        print("run getSegCoord.py")
        seg_coord("RiceGraph_cactus.gfa",path_list)
        args.segment_coordinates_path="seg_coord/"
    #else:
    #    path_segcoord=args.segment_coordinates_path
    print("run intersect") # intersect between gff and several bed
    command="for f in "+args.segment_coordinates_path+"*"+args.source_genome+"*; do bedtools intersect -wo -a $f -b "+args.gff.name+" >> "+args.segment_coordinates_path+"intersect;done"
    subprocess.run(command,shell=True,timeout=None)