#!/usr/bin/python3

import os, sys, xml.dom.minidom, re, os.path

def findAllFzp(dirList=["bins","contrib","core","obsolete"]):
    result=[]
    for d in dirList:
        for root, dirs, files in os.walk(d):
            for file in files:
                if file.endswith(".fzp"):
                    result.append(os.path.join(root, file))
    result.sort()
    return result

class Author:
    def __init__(self,name="", year=""):
        self.name=name.strip()
        self.year=year.strip()
        
    def __str__(self):
        template="{year} {name}"
        return template.format(**self.__dict__)

    def __eq__(self, other):
        return self.name==other.name and self.year==other.year

    def __lt__(self, other):
        return self.name < other.name or self.year < other.year

yearpattern=re.compile(r".*(\d\d\d\d).*")
def fzp2authorDict(paths):
    result={}
    i=0
    for p in paths:
        try:
            msg="file not parsed"
            doc=xml.dom.minidom.parse(open(p, "rt", encoding="utf-8"))
            msg="date not parsed"
            date=doc.getElementsByTagName("date")[0]
            msg="author's name not parsed"
            name=doc.getElementsByTagName("author")[0]
            msg="year not parsed"
            year=yearpattern.match(date.firstChild.nodeValue).group(1)
            sys.stdout.write("{}\r".format(i))
            i+=1
            author=Author(name.firstChild.nodeValue, year)
            # add paths into the dictionary. In order to be able
            # to make space separated path lists, the space characters
            # are replaced by the '?' wildcards.
            if str(author) in result:
                result[str(author)].append(p.replace(" ","?"))
            else:
                result[str(author)]=[p.replace(" ","?")]
        except Exception as e:
            sys.stderr.write("{}\n".format(e))
            sys.stderr.write("Error, malformed XML file: {} ({})\n".format(p, msg))
    sys.stdout.write("\n")
    return result

def authorDict2copyright(d):
    result=""
    authors=sorted(d.keys())
    for a in authors:
        result+="""

Files: {}
Copyright: {}
License: CC-BY-SA-3.0
""".format(" ".join(d[a]), a)
    return result

if __name__=="__main__":
    fzps=findAllFzp()
    dictAuthor=fzp2authorDict(fzps)
    copyrightFile=os.path.abspath(os.path.join(os.path.dirname(__file__),
                                               "copyright"))
    with open(copyrightFile, "wt", encoding="utf-8") as outfile, \
         open(copyrightFile+".in", "rt", encoding="utf-8") as infile:
        lines=infile.readlines()
        for l in lines:
            if "#end authors of parts" not in l:
                outfile.write(l)
            else:
                outfile.write(authorDict2copyright(dictAuthor))
                outfile.write("Comment: "+l)
    print("wrote", copyrightFile)