# 
# 20,000 Light Years Into Space
# This game is licensed under GPL v2, and copyright (C) Jack Whitham 2006-07.
# 


import pygame , time
from pygame.locals import *

import stats

__messages = []
__day = 0
__change = False

MSG_MAX = 5
MSG_MARGIN = 5
MSG_EXPIRY_TIME = 20

def Has_New_Mail():
    global __messages, __change

    # Limit number of on-screen messages
    while ( len(__messages) > MSG_MAX ):
        __messages.pop(0)
        __change = True

    # Expire old messages
    cur_time = time.time()
    while (( len(__messages) != 0 )
    and ( __messages[ 0 ][ 0 ] <= cur_time )):
        __messages.pop(0)
        __change = True

    x = __change
    __change = False
    return x

def Draw_Mail(output):
    # Show current messages
    y = output.get_rect().height - MSG_MARGIN

    for (tm, surf) in reversed(__messages):
        y -= surf.get_rect().height

        r = surf.get_rect()
        r.topleft = (MSG_MARGIN, y)
        output.blit(surf, r.topleft)


def Set_Day(day):
    global __day
    __day = int(day)

def New_Mail(text, colour=(128,128,128)):
    global __messages, __day, __change
    text = ( "Day %u: " % __day ) + text
    __messages.append((time.time() + MSG_EXPIRY_TIME, 
            stats.Get_Font(20).render(text, True, colour)))
    __change = True

def Initialise():
    global __messages
    __messages = []
    __change = True