from __future__ import print_function

import P4
import argparse
import re

class BufferedIterator:
    def __init__(self, it):
        self.it = iter(it)
        self.buf = []

    def __iter__(self): return self

    def __next__(self):
        if self.buf:
            return self.buf.pop()
        return next(self.it)

    def push(self, item):
        self.buf.append(item)

class Configurable:
    def __init__(self, name, default, description, undocumented = False):
        self.name = name
        self.default = default
        self.description = description
        self.undocumented = undocumented

    def __str__(self):
        return "{}: {}\t\t{}\t\t{}".format("undoc" if self.undocumented else "  doc",self.name, self.default, self.description)


class Configurables:
    def __init__(self, p4):
        self.server_configurables = []
        self.client_configurables = []

        # self.current_configurables = self.server_configurables

        self.p4 = p4
        with self.p4.connect():
            documented = self.p4.run_help('configurables')
            undoc = self.p4.run_help('undoc')


        print("".join(documented[0]))
        print("".join(undoc))

        self.parse_help_output(documented[0], False)
        self.parse_help_output(undoc[0], True)

        print("Server:\n")
        for c in self.server_configurables:
            print(c)
        print("\n\nClient:\n")
        for c in self.client_configurables:
            print(c)

    def parse_help_output(self, documented, undocumented=False):
        header = re.compile("\tName\s+Default\s+Use")
        underline = re.compile("\t----\s+-------\s+---")

        lines = [x for x in documented.split('\n') if x] # strip out empty lines

        line_iter = BufferedIterator(lines)
        line = next(line_iter)

        self.current_configurables = self.server_configurables

        try:
            while (line):
                if header.match(line):
                    line = next(line_iter)
                    if underline.match(line):
                        self.process_help(line_iter, undocumented)
                line = next(line_iter)
        except StopIteration:
            pass

    def process_help(self, line_iter, undocumented=False):
        pattern = re.compile("\t([^\s]+)\s+([^\s+]+)\s+(.+)")
        terminators = [ '   Perforce client configurables',
                        '    P4CHARSET',
                        '    Perforce client configuration (unsupported)' ]

        try:
            line = next(line_iter)
            while line:
                match = pattern.match(line)
                if match:
                    conf = Configurable(match.group(1), match.group(2), match.group(3), undocumented)
                    self.current_configurables.append(conf)

                    # let's see if there is more description to be had
                    # if it is the final end bit, exception will get us out of here

                    line = next(line_iter)
                    while line:
                        match = pattern.match(line)
                        if match:   # seems like this is the next one configurable, push back
                            line_iter.push(line)
                            break
                        elif line in terminators:
                            # we found the next section, return and try again
                            self.current_configurables = self.client_configurables
                            return
                        else:
                            line = line.strip()
                            conf.description += "\n"
                            conf.description += line

                            line = next(line_iter)

                    line = next(line_iter)
                else: # check if it is the end of this help section
                    if line in terminators:
                        self.current_configurables = self.client_configurables
                        return
        except StopIteration:
            pass



if __name__ == '__main__':
    parser = argparse.ArgumentParser(
        description="P4Configure",
        epilog="Copyright (C) 2018 Sven Erik Knop, Perforce Software Ltd"
    )

    parser.add_argument("-p", "--port", help="P4PORT")
    parser.add_argument("-u", "--user", help="P4USER")
    parser.add_argument("-P", "--password", help="P4PASSWD")

    args = parser.parse_args()

    p4 = P4.P4()
    if args.port:
        p4.port = args.port
    if args.user:
        p4.user = args.user
    if args.password:
        p4.password = args.password

    configurables = Configurables(p4)