# see settingsDefinition.py
import os
import os.path

class ValidationException(Exception):
    pass

def validateWorldPath(path):
    try:
        if not os.path.exists(path):
            raise ValidationException("%r does not exist" % path)
        if not os.path.isdir(path):
            raise ValidationException("%r is not a directory" % path)
    except ValidationException, e:
        # TODO assume this is the name of a world and try
        # to find it
        raise e
    full_path = os.path.abspath(path)
    return full_path

def validateRenderMode(mode):
    # TODO get list of valid rendermodes
    #raise NotImplementedError("validateRenderMode")
    return mode

def validateNorthDirection(direction):
    # normalize to integers
    intdir = 0 #default
    if type(direction) == int:
        intdir = direction
    else:
        if direction == "upper-left": intdir = 0
        if direction == "upper-right": intdir = 1
        if direction == "lower-right": intdir = 2
        if direction == "lower-left": intdir = 3
    if intdir < 0 or intdir > 3:
        raise ValidationException("%r is not a valid north direction" % direction)
    return intdir

def validateRenderRange(r):
    raise NotImplementedError("render range")

def validateStochastic(s):
    val = float(s)
    if val < 0 or val > 1:
        raise ValidationException("%r is not a valid stochastic value.  Should be between 0.0 and 1.0" % s)
    return val

def validateImgFormat(fmt):
    if fmt not in ("png", "jpg", "jpeg"):
        raise ValidationException("%r is not a valid image format" % fmt)
    if fmt == "jpeg": fmt = "jpg"
    return fmt

def validateImgQuality(qual):
    intqual = int(qual)
    if (intqual < 0 or intqual > 100):
        raise ValidationException("%r is not a valid image quality" % intqual)
    return intqual

def validateBGColor(color):
    """BG color must be an HTML color, with an option leading # (hash symbol)
    returns an (r,b,g) 3-tuple  
    """
    if type(color) == str:
        if color[0] != "#":
            color = "#" + color
        if len(color) != 7:
            raise ValidationException("%r is not a valid color.  Expected HTML color syntax (i.e. #RRGGBB)" % color)
        try:
            r = int(color[1:3], 16)
            g = int(color[3:5], 16)
            b = int(color[5:7], 16)
            return (r,g,b,0)
        except ValueError:
            raise ValidationException("%r is not a valid color.  Expected HTML color syntax (i.e. #RRGGBB)" % color)
    elif type(color) == tuple:
        if len(color) != 4:
            raise ValidationException("%r is not a valid color.  Expected a 4-tuple" % (color,))
        return color


def validateOptImg(opt):
    return bool(opt)

def validateTexturePath(path):
    # Expand user dir in directories strings
    path = os.path.expanduser(path)
    # TODO assert this path exists?