# gameutil.py

# This is a home for nice helper functions that were useful, but also cluttered
# the GameBase class.

import re as _re

coordRegex = _re.compile(r'(?:(-?[a-zA-Z]+) ?(-?[0-9]+))|(?:(-?[0-9]+),? (-?[0-9]+))|(?:\(([0-9]+), ([0-9]+)\))')

def letterToNumber(letter):
    if letter.isdecimal():
        return int(letter)
    ret = 0
    sign = 1
    start = 0
    for i in range(len(letter)):
        if letter[i] == '-':
            sign = -sign
            start -= 1
        elif letter[i].isalpha():
            if letter[i].isupper():
                ret += (ord(letter[i]) - ord('A')) * (26**(i+start))
            else:
                ret += (ord(letter[i]) - ord('a')) * (26**(i+start))
        else:
            return ret * sign
    return ret * sign
    
def numberToLetter(number):
    if isinstance(number, str):
        return number
    ret = ''
    sign = ''
    if number == 0:
        return 'A'
    elif number < 0:
        sign = '-'
        number = -number
    while number > 0:
        ret += chr(ord('A') + number % 26)
        number = int(number / 26)
    return sign + ret
        
def parseCoords(level, args, usePlayerCoords = True, player = None):
    """Takes an argument list, and figures out what it's talking about.
Returns (thing, x, y). "Thing" can be None."""
    if level == None:
        raise ValueError('Coordinates cannot be parsed because there is no map.')
    x = -1
    y = -1
    
    # first, try by name for objects in the map
    name = ' '.join(args)
    thing = level.getThingByName(name)
    if thing != None:
        if usePlayerCoords:
            return thing, thing.playerx, thing.playery
        else:
            return thing, thing.x, thing.y
    
    # Second, try by name for objects in the inventory
    if player != None:
        if name in player.thingNames:
            return player.getThingByName(name), -1, -1
    
    # Third, try by location
    coordStr = args[0]
    if len(args) > 1:
        coordStr += ' ' + args[1]
    match = coordRegex.match(coordStr)
    if match != None: # if coordinates were given
        groups = match.groups()
        ind = 0
        for i in range(len(groups)):
            if groups[i] == None or groups[i] == match.group():
                continue
            else:
                ind = i
                break
        x = letterToNumber(groups[ind])
        y = letterToNumber(groups[ind+1])
        thing = level.getThingAtCoords(x, y)
        if thing != None and usePlayerCoords:
            return thing, thing.playerx, thing.playery
        else:
            return thing, x, y
    else: # if a name was given
        return None, -1, -1

def startDialog(thing, outstream, dialog):
    if 'dialogs' in thing.customValues: 
        if isinstance(thing.customValues['dialogs'], list):
            if 'dialogPtr' in thing.customValues and isinstance(thing.customValues['dialogPtr'], int):
                dialog(thing.customValues['dialogs'][thing.customValues['dialogPtr']], thing)
            else:
                dialog(thing.customValues['dialogs'][0], thing)
        elif isinstance(thing.customValues['dialogs'], str):
            dialog(thing.customValues['dialogs'], thing)
        else:
            raise GameError("Character '{}' has dialog of an unexpected type.".format(thing.name))
    else:
        print("{} has nothing to say to you.".format(thing.name), file = outstream)