from Graph_gff import Segments, Features, write_line
from Functions import *


### functions to generate a genome's gff from the graph's gff


# functions to get the gff with one line per feature
# outputs the feature once in a gff, from the first to the last segment present on the new genome (if the size is ok) :
def generate_target_gff(first_seg,last_seg,feature_id,max_diff):

    if (first_seg!=''): # feature present on the target genome
        size_on_new_genome=get_feature_stop_on_target_genome(last_seg,feature_id)-get_feature_start_on_target_genome(first_seg,feature_id)+1
        size_diff=abs(size_on_new_genome-Features[feature_id].size)
        if right_size(size_on_new_genome,max_diff,feature_id): 
            line_gff=create_line_target_gff(first_seg,last_seg,feature_id,size_diff)
            write_line(line_gff,output_target_gff,False)
            return size_diff
        else:
            return "bad_size"
    else :
        return "absent"



# writes the gff of target genome using the gff of the graph
def transfer_on_target(segments_file, out_target_gff, out_var,out_aln,target_genome,target_genome_paths,args):

    print(f'generation of {target_genome} output')
    stats=False
    list_feature_to_transfer= Features.keys()
    segments_list={}

    for feat in list_feature_to_transfer:
        add_target_genome_path(feat,target_genome_paths)

    if args.annotation:
        print(f'    generation of {target_genome} gff')
        file_out=open(out_target_gff,'w')
        global output_target_gff
        output_target_gff=[0,"",file_out]
        bad_size_features=0
        absent_features=0
        diff_size_transfered_features=[0,0] # [count,sum], to get the average

        for feat in list_feature_to_transfer:
            # for each feature, get list of the segments where it is and the first and last segment of the feature on the new genome
            feature_target_path=Features[feat].segments_list_target
            [first_seg,last_seg]=get_first_last_seg(feature_target_path)

            transfer_stat=generate_target_gff(first_seg,last_seg,feat,args.max_difference) # insertions not considered !!!
            if transfer_stat=="bad_size":
                bad_size_features+=1
            elif transfer_stat=="absent":
                absent_features+=1
            else:
                diff_size_transfered_features[0]+=1
                diff_size_transfered_features[1]+=transfer_stat

        write_line("",output_target_gff,True)
        file_out.close()

    if args.variation | args.alignment : # append dict of segments for which we may need the sequence
        for feat in list_feature_to_transfer:
            list_seg=Features[feat].segments_list_source
            feature_target_path=Features[feat].segments_list_target
            for segment in list_seg:
                segments_list[segment[1:]]=''
            for segment in feature_target_path:
                segments_list[segment[1:]]=''

    if args.variation:
        print(f'    generation of {target_genome} genes variation details')
        seg_seq=get_segments_sequence(segments_file,segments_list)
        file_out_var = open(out_var, 'w')
        global output_variations
        output_variations=[0,"",file_out_var]

        for feat in list_feature_to_transfer:
            # for each feature, get list of the segments where it is and the first and last segment of the feature on the new genome
            list_seg=Features[feat].segments_list_source
            feature_target_path=Features[feat].segments_list_target
            [first_seg,last_seg]=get_first_last_seg(feature_target_path)

            print_variations(first_seg,last_seg,feat,seg_seq)

        write_line("",output_variations,True)
        file_out_var.close()

    if args.alignment:
        print(f'    generation of {args.source_genome} genes alignment with {target_genome} genes')
        if not args.variation:
            seg_seq=get_segments_sequence(segments_file,segments_list)
        file_aln=open(out_aln,'w')
        global output_target_aln
        output_target_aln=[0,"",file_aln]
        write_line("Sequence alignment generated from feature path comparison in pangenome graph. Made with GrAnnoT v1.\n\n",output_target_aln,False)

        for feat in list_feature_to_transfer:  
            list_seg=Features[feat].segments_list_source
            feature_target_path=Features[feat].segments_list_target
            [first_seg,last_seg]=get_first_last_seg(feature_target_path)

            print_alignment(first_seg,feat,seg_seq)

        write_line("",output_target_aln,True)
        file_aln.close()


    if stats:
        # create objects for stats on how many segments are absent in target genome, their average length, etc
        feature_missing_segments=[[],[],[],[],[],[],[]] # [feature_missing_first,feature_missing_middle,feature_missing_last,feature_missing_all,feature_missing_total,feature_total,feature_ok]
        # the fist segment of the feature is missing - feature_missing_first
        # the last segment of the feature is missing - feature_missing_last
        # at least one middle segment of the feature is missing - feature_missing_middle
        # the entire feature is missing - feature_missing_all
        # at least one segment is missing first, last, or middle) - feature_missing_total
        # no segment is missing, the feature is complete - feature_ok  
        # total number of features, with missing segments or not - feature_total

        # for each feature, get list of the segments where it is and the first and last segment of the feature on the new genome
        list_seg=Features[feat].segments_list_source
        feature_target_path=Features[feat].segments_list_target
        [first_seg,last_seg]=get_first_last_seg(feature_target_path)

        for feat in list_feature_to_transfer:
            stats_feature_missing_segment(feature_missing_segments,first_seg,last_seg,list_seg,feat)

        if args.annotation:
            print(len(Features)-(bad_size_features+absent_features),"out of",len(Features),"features are transfered.")
            print(bad_size_features,"out of",len(Features), "features are not transfered because they are too big or too small compared to the original genome.")
            print(absent_features,"out of",len(Features),"features are not transfered because they are absent in the new genome.")
            print("average length difference of the transfered genes : ",diff_size_transfered_features[1]/diff_size_transfered_features[0])
        stats_features(feature_missing_segments)


def get_first_last_seg(seg_list):
    if len(seg_list)!=0:
        first_seg=seg_list[0]
        last_seg=seg_list[-1]
    else:
        first_seg=''
        last_seg=''
    return [first_seg,last_seg]

# fct to get the alignment between the features on the source genome and the features on the target genome 
def print_alignment(first_seg,feat,seg_seq):
    if first_seg!='': # if the feature is not completly absent
        feature=Features[feat]
        feature_path_target_genome=feature.segments_list_target
        feature_path_source_genome=feature.segments_list_source
        [feature_path_source_genome,feature_path_target_genome,inversion]=detect_feature_inversion(feature_path_source_genome,feature_path_target_genome)

        line_aln=create_line_aln(feature_path_source_genome,feature_path_target_genome,seg_seq,feat)
        write_line(line_aln,output_target_aln,False)


# functions to get the detail of the variations in the features

def print_variations(first_seg,last_seg,feat,seg_seq):

    if first_seg!='': # if the feature is not completly absent        # add the else, output absent features
        [variation,feature_path_source_genome,feature_path_target_genome]=create_var(feat,first_seg,last_seg) # removes the strands in the segment lists
        feature=Features[feat]
        feat_start=feature.start
        # loop to go through both paths with i and j
        [i,j,var_count]=[0,0,0]

        # detect and print variations ignoring the strands
        while (i<len(feature_path_source_genome)) & (j<len(feature_path_target_genome)):
            if feature_path_source_genome[i] != feature_path_target_genome[j]: # if there is a difference between the two paths

                if feature_path_target_genome[j] not in feature_path_source_genome: # if the segment in target genome is absent in source genome
                    if feature_path_source_genome[i] not in feature_path_target_genome: # if the segment in source genome is absent is target genome

                        # if both segments are absent in the other genome, its a substitution
                        variation.last_seg_in_target=feature_path_target_genome[j]
                        if (variation.type=='insertion') | (variation.type=='deletion'): # print the current variation before treating the substitution
                            print_current_var(variation,feat_start,feature_path_target_genome,feat)
                            reset_var(variation)
                            var_count+=1
                        if variation.type=='substitution':
                            continue_var(variation,seg_seq,feature_path_source_genome,feature_path_target_genome,i,j,0)
                        else: # initiate substitution
                            init_new_var(variation,"substitution",feature_path_source_genome,feature_path_target_genome,i,j,seg_seq,feature)
                        i+=1;j+=1

                    else: # target genome segment not in source_genome, but source_genome segment in target genome : insertion or continue substitution
                        if variation.type=='deletion': # print the current variation before treating the insertion
                            print_current_var(variation,feat_start,feature_path_target_genome,feat)
                            reset_var(variation)
                            var_count+=1
                        variation.last_seg_in_target=feature_path_target_genome[j]
                        if variation.type=='insertion':
                            continue_var(variation,seg_seq,feature_path_source_genome,feature_path_target_genome,i,j,0)
                        elif variation.type=="substitution":
                            while feature_path_target_genome[j]!=feature_path_source_genome[i]:
                                continue_var(variation,seg_seq,feature_path_source_genome,feature_path_target_genome,i,j,2)
                                j+=1
                            print_current_var(variation,feat_start,feature_path_target_genome,feat)
                            reset_var(variation)
                            var_count+=1
                            j-=1
                        else: # intiate insertion
                            init_new_var(variation,"insertion",feature_path_source_genome,feature_path_target_genome,i,j,seg_seq,feature)
                        j+=1

                elif feature_path_source_genome[i] not in feature_path_target_genome: # source_genome segment not in target genome, but target genome segment in source_genome : deletion or continue substitution
                    if variation.type=='insertion': # print the current variation before treating the deletion
                        print_current_var(variation,feat_start,feature_path_target_genome,feat)
                        reset_var(variation)
                        var_count+=1
                    if variation.type=='deletion':
                        continue_var(variation,seg_seq,feature_path_source_genome,feature_path_target_genome,i,j,0)
                    elif variation.type=="substitution":
                        while feature_path_target_genome[j]!=feature_path_source_genome[i]:
                            continue_var(variation,seg_seq,feature_path_source_genome,feature_path_target_genome,i,j,1)
                            i+=1
                        print_current_var(variation,feat_start,feature_path_target_genome,feat)
                        reset_var(variation)
                        var_count+=1
                        i-=1
                    else: # intiate deletion
                        init_new_var(variation,"deletion",feature_path_source_genome,feature_path_target_genome,i,j,seg_seq,feature)
                    i+=1

                else : # if both segments are present in the other genome but not at the same position. weird case never found yet
                    # can be a substitution. check later if its not an inversion
                    variation.last_seg_in_target=feature_path_target_genome[j]
                    if (variation.type=='insertion') | (variation.type=='deletion'): # print the current variation before treating the substitution
                        print_current_var(variation,feat_start,feature_path_target_genome,feat)
                        reset_var(variation)
                        var_count+=1
                    if variation.type=='substitution':
                        continue_var(variation,seg_seq,feature_path_source_genome,feature_path_target_genome,i,j,0)
                    else: # initiate substitution
                        init_new_var(variation,"substitution",feature_path_source_genome,feature_path_target_genome,i,j,seg_seq,feature)
                    i+=1;j+=1

            else: # segment present in both, no variation. print the running indel if there is one
                if variation.type!='': # print the current variation if there is one
                    print_current_var(variation,feat_start,feature_path_target_genome,feat)
                    var_count+=1
                    reset_var(variation)
                variation.last_seg_in_target=feature_path_target_genome[j]
                i+=1;j+=1

        if (variation.type!=''): # if there was a current variation when we reached the end, print it
            print_current_var(variation,feat_start,feature_path_target_genome,feat)
            var_count+=1
            reset_var(variation)

        if i<=len(feature_path_source_genome)-1: # if we didn't reach the length of the segment list for the first genome, the end is missing for the second genome
            print_last_deletion(variation,feature_path_source_genome,i,feat_start,feature,seg_seq)
            var_count+=1
            reset_var(variation)

        if var_count==0: # if no variation was encountered
            print_novar(variation)


def print_current_var(variation,feat_start,feature_path_target_genome,feat):
    warning=''
    if variation.type=='insertion':
        [pos_old,pos_new]=get_old_new_pos_insertion(variation,feat_start,feature_path_target_genome,feat)
        line=f'{variation.feature_id}\t{variation.feature_type}\t{variation.chr}\t{variation.start_new}\t{variation.stop_new}\t{variation.size_new}\t{variation.inversion}\t{variation.size_diff}\tinsertion\t-\t{variation.alt}\t{len(variation.alt)}\t{pos_old}\t{pos_new}{warning}\n'
        write_line(line,output_variations,False)
    elif variation.type=='deletion':
        [pos_old,pos_new]=get_old_new_pos_deletion(variation,feat_start,feature_path_target_genome,feat)
        line=f'{variation.feature_id}\t{variation.feature_type}\t{variation.chr}\t{variation.start_new}\t{variation.stop_new}\t{variation.size_new}\t{variation.inversion}\t{variation.size_diff}\tdeletion\t{variation.ref}\t-\t{len(variation.ref)}\t{pos_old}\t{pos_new}{warning}\n'
        write_line(line,output_variations,False)
    elif variation.type=='substitution':
        warning=detect_small_inversion(variation)
        [pos_old,pos_new]=get_old_new_pos_substitution(feat_start,variation,feature_path_target_genome,feat)

        size_subs=f'{len(variation.ref)}/{len(variation.alt)}'
        line=f'{variation.feature_id}\t{variation.feature_type}\t{variation.chr}\t{variation.start_new}\t{variation.stop_new}\t{variation.size_new}\t{variation.inversion}\t{variation.size_diff}\tsubstitution\t{variation.ref}\t{variation.alt}\t{size_subs}\t{pos_old}\t{pos_new}{warning}\n'
        
        # print the substitutions of different size as deletion+insertion.
        #if len(variation.ref) == len(variation.alt): # if the substituion is between two segment of the same size, print it
        #    size_subs=len(variation.ref)
        #    line=f'{variation.feature_id}\t{variation.feature_type}\t{variation.chr}\t{variation.start_new}\t{variation.stop_new}\t{variation.size_new}\t{variation.inversion}\t{variation.size_diff}\tsubstitution\t{variation.ref}\t{variation.alt}\t{size_subs}\t{pos_old}\t{pos_new}{warning}\n'
        #else :
        #    # if the segments of the substitution have a different size, print deletion then insertion at the same position.
        #    line=f'{variation.feature_id}\t{variation.feature_type}\t{variation.chr}\t{variation.start_new}\t{variation.stop_new}\t{variation.size_new}\t{variation.inversion}\t{variation.size_diff}\tdeletion\t{variation.ref}\t-\t{len(variation.ref)}\t{pos_old}\t{pos_new}{warning}\n'
        #    line+=f'{variation.feature_id}\t{variation.feature_type}\t{variation.chr}\t{variation.start_new}\t{variation.stop_new}\t{variation.size_new}\t{variation.inversion}\t{variation.size_diff}\tinsertion\t-\t{variation.alt}\t{len(variation.alt)}\t{pos_old}\t{pos_new}{warning}\n'
        write_line(line,output_variations,False)

def detect_small_inversion(variation):
    [list_ref_common,list_alt_common]=[list(),list()]
    list_ref_unstrand=[segment_stranded[1:] for segment_stranded in variation.seg_ref]
    list_alt_unstrand=[segment_stranded[1:] for segment_stranded in variation.seg_alt]
    for seg in variation.seg_ref:
        if seg[1:] in list_alt_unstrand:
            list_ref_common.append(seg)
    for seg in variation.seg_alt:
        if seg[1:] in list_ref_unstrand:
            list_alt_common.append(seg)
    if (len(list_ref_common)>len(list_ref_unstrand)*0.5) & (len(list_alt_common)>len(list_alt_unstrand)*0.5):
        return f'\t# Suspected inversion within this substitution.'
    else:
        return ''



def print_last_deletion(variation,feature_path_source_genome,i,feat_start,feature,seg_seq):
    seg_del=search_segment(feature_path_source_genome[i])
    pos_old=int(Segments[seg_del].start)-int(feat_start)+1

    del_sequence=get_sequence_list_seg(feature_path_source_genome,i,feature,seg_seq)
    length=len(del_sequence)
    pos_new=str(int(variation.size_new)+1) # the deletion is at the end of the feature on the new genome

    line=f'{variation.feature_id}\t{variation.feature_type}\t{variation.chr}\t{variation.start_new}\t{variation.stop_new}\t{variation.size_new}\t{variation.inversion}\t{variation.size_diff}\tdeletion\t{del_sequence}\t-\t{length}\t{pos_old}\t{pos_new}\n'
    write_line(line,output_variations,False)

def print_novar(variation):
    line=f'{variation.feature_id}\t{variation.feature_type}\t{variation.chr}\t{variation.start_new}\t{variation.stop_new}\t{variation.size_new}\t{variation.inversion}\t{variation.size_diff}\tno_var\t-\t-\t-\t-\t-\n'
    write_line(line,output_variations,False)


# not used. 

def get_list_segments_missing(list_seg,segments_on_target_genome):
    segments_missing=[]
    for segment in list_seg:
            if segment not in segments_on_target_genome:
                segments_missing.append(Segments[segment])
    return segments_missing

# takes a feature and a feature type, returns a list of child features that have the wanted type.
def get_child_list(feature,child_type):
    if type=="":
        return feature.childs
    list_childs=[]
    for child in feature.childs:
        if Features[child].type==child_type:
            list_childs.append(child)
    return list_childs