from json import loads
from datetime import datetime
from re import compile

# scale down coordinates to dx=1 per day to prevent SVG coordinate overflows
scale = 1/60/60/24

def get_date(dtime):
    return datetime.fromtimestamp(dtime).strftime('%Y-%m-%d %H:%M')

def make_line(event):
    evstart = event['period'][0]
    evstop = event['period'][1]
    return '<line{type} x1="{start}" x2="{stop}" y1="{height}" y2="{height}"><title>{text} ({start_date} — {stop_date})</title></line>'.format(
        type = '' if event['status'] == 'online' else ' class="error"',
        start = scale*evstart,
        stop = scale*evstop,
        start_date = get_date(evstart),
        stop_date = get_date(evstop),
        height = len(event['players']) if 'players' in event else 0,
        text = ('no one' if len(event['players']) == 0 else ', '.join(event['players'])) if event['status'] == 'online' else event['status']
    )

def get_lines(start,stop):
    lines = []
    find_start = compile(r'x1="([0-9.]+)"')
    find_stop = compile(r'x2="([0-9.]+)"')
    with open('events.log', 'r') as fin:
        for l in fin:
            evstart = float(find_start.search(l).group(1))
            evstop = float(find_stop.search(l).group(1))

            if evstop > start and evstart < stop:
                lines.append(l)
    with open('current-state.json', 'r') as fin:
        lines.append(make_line(loads(fin.read())))

    return lines

def make_html(name,period):
    stop = scale*datetime.now().timestamp()
    start = stop-period
    lines = get_lines(start, stop)
    display_scale = 24*60/10 # 1 pixel per 10 minutes
    with open('template.html', 'r') as fin:
        with open(name+'.html', 'w') as fout:
            fout.write(fin.read().format(
                width = display_scale*period,
                start = start,
                period = period,
                day_start = scale*datetime.fromtimestamp(start/scale).replace(hour=0,minute=0,second=0,microsecond=0).timestamp(),
                day_stop = stop,
                events = ''.join(lines)
            ))

def make_htmls():
    make_html('day', 1)
    make_html('month', 31)
    make_html('4months', 120)

make_htmls()