"""Python Client Library for Health Graph API (http://developer.runkeeper.com/healthgraph). 

The API is used for accessing RunKeeper (http://runkeeper.com) for retrieving, 
updating, deleting and uploading Fitness Activity and Health Measurements Information.

This module contains the classes and methods for parsing Health Graph API data.

"""

import re
from datetime import date, datetime
import healthgraph.settings
import healthgraph.exceptions

__author__ = "Ali Onur Uyar"
__copyright__ = "Copyright 2012, Ali Onur Uyar"
__credits__ = []
__license__ = "GPL"
__version__ = "0.3.0"
__email__ = "aouyar at gmail.com"
__status__ = "Development"

    
def parse_bool(val):
    if val is None:
        return None
    elif isinstance(val, bool):
        return val
    elif val.lower() == 'true':
        return True
    elif val.lower() == 'false':
        return False
    else:
        raise exceptions.ParseValueError("Error parsing bool value.")

def parse_date(val):
    if val is None:
        return None
    else:
        mobj = re.match('\w+,\s*(\d+)\s+(\w+)\s+(\d+)', val)
        if mobj is not None:
            return date(int(mobj.group(3)), 
                        settings.MONTH2NUM[mobj.group(2)],
                        int(mobj.group(1)))
        else:
            exceptions.ParseValueError("Error parsing date value.")
            
def parse_datetime(val):
    if val is None:
        return None
    else:
        mobj = re.match('\w+,\s*(\d+)\s+(\w+)\s+(\d+)\s+(\d+):(\d+):(\d+)', val)
        if mobj is not None:
            return datetime(int(mobj.group(3)), 
                            settings.MONTH2NUM[mobj.group(2)],
                            int(mobj.group(1)),
                            int(mobj.group(4)),
                            int(mobj.group(5)),
                            int(mobj.group(6)),)
        else:
            exceptions.ParseValueError("Error parsing date-time value.")
        
def parse_distance(val):
    if val is None:
        return None
    try:
        return float(val)
    except:
        raise exceptions.ParseValueError("Error parsing distance value.")
    
def parse_distance_km(val):
    if val is None:
        return None
    try:
        return float(val) * 1000
    except:
        raise exceptions.ParseValueError("Error parsing distance value.")
    
def parse_resource_dict(prop_defs, data):
    prop_dict = dict([(k, None) for k in prop_defs])
    for k,v in data.items():
        if prop_defs.has_key(k):
            action = prop_defs[k]
            if action is None or v is None:
                prop_dict[k] = v
            elif callable(action):
                prop_dict[k] = action(v)
        else:
            pass
    return prop_dict

def parse_date_param(val):
    if isinstance(val, (date, datetime)):
        return val.strftime('%y-%m-%d')
    else:
        return val