#!./env/bin/python

import yaml, textwrap
from prettytable import PrettyTable
from datetime import datetime, timedelta

with open("infos2.yaml", "r") as f:
    _i=yaml.safe_load(f)

#### Parsing
def parse_date(s):
    return datetime.strptime(s, "%d/%m/%Y")
def parse_time(s):
    return datetime.strptime(s, "%H:%M")
#### Dates
def getmonday(d):
    return d - timedelta(days=d.weekday())
def getnextmonday(d):
    return getmonday(d)+timedelta(days=7)
def getnextdayn(d,n):
    return (d+timedelta(days=n))
def getweek(d):
    return d.isocalendar().week
def getdayname(d):
    return d.strftime("%A").lower()
#### Formatting
def gettime(d):
    return d.strftime("%H:%M")
def matchrepeat(d,e):
    _r=events[e]["repeat"]
    if _r["every"] <= 0:
        return False
    delta=timedelta(days=_r["every"])
    current=events[e]["date"]
    while current.date() <= sem["end"].date():
        if _r["until"] is not None and _r["until"].date()<current.date():
            break
        if current.date() == d.date():
            return True
        current+=delta
        continue
    return False
def formatevents(d):
    output=""
    for e in events:
        _e=events[e]
        if (not _e["hidden"]) and (_e["date"].date() == d.date() or matchrepeat(d, e)):
            if _e["start"] is not None:
                output+=gettime(_e["start"])+"-"+gettime(_e["end"])+"\n"
            if _e["room"] is not None:
                output+="Room: "+_e["room"]+"\n"
            output+=_e["name"]
    return output
def formatday(d):
    return d.strftime("%b %d")

#### Load semester
sem={
    "start": parse_date(_i["semester"]["start"]),
    "end": parse_date(_i["semester"]["end"]),
    "slots": {}
}
for e in _i["semester"]["slots"]:
    _e=_i["semester"]["slots"][e]
    sem["slots"][e]={}
    for dayname in ["monday","tuesday","wednesday","thursday","friday"]:
        sem["slots"][e][dayname]={
            "start": None,
            "end": None,
            "room": None
        }
        if dayname in _e.keys():
            if "start" in _e[dayname].keys():
                sem["slots"][e][dayname]["start"]=parse_time(_e[dayname]["start"])
                sem["slots"][e][dayname]["end"]=parse_time(_e[dayname]["end"])
            if "room" in _e[dayname].keys():
                sem["slots"][e][dayname]["room"]=_e[dayname]["room"]

#### Load events
events={}
for e in _i["events"]:
    _e=_i["events"][e]
    events[e]={
        "type": _e["type"],
        "name": _e["name"],
        "date": parse_date(_e["date"]),
        "repeat": {
            "every": 0,
            "until": None
        }
    }
    events[e]["hidden"]=_e["hidden"] if "hidden" in _e.keys() else False
    events[e]["who"]=_e["who"] if "who" in _e.keys() else None
    events[e]["start"]=parse_time(_e["start"]) if "start" in _e.keys() else None
    events[e]["end"]=parse_time(_e["end"]) if "end" in _e.keys() else None
    events[e]["room"]=_e["room"] if "room" in _e.keys() else None
    if "repeat" in _e.keys():
        events[e]["repeat"]["every"]=_e["repeat"]["every"]
        events[e]["repeat"]["until"]=parse_date(_e["repeat"]["until"]) if "until" in _e["repeat"].keys() else None
    if _e["type"] in sem["slots"].keys():
        dayname=getdayname(events[e]["date"])
        if events[e]["start"] is None:
            events[e]["start"] = sem["slots"][_e["type"]][dayname]["start"]
        if events[e]["end"] is None:
            events[e]["end"] = sem["slots"][_e["type"]][dayname]["end"]
        if events[e]["room"] is None:
            events[e]["room"] = sem["slots"][_e["type"]][dayname]["room"]

#### Gen semester calendar
d=getmonday(sem["start"])
w=getweek(d)
while d<=sem["end"]:
    t = PrettyTable()
    t.field_names = ["Week "+str(w), "Monday", "Tuesday", "Wednesday", "Thursday", "Friday"]
    t.align[t.field_names[0]]="l"
    t.add_row(["",
               formatday(getnextdayn(d, 0)),
               formatday(getnextdayn(d, 1)),
               formatday(getnextdayn(d, 2)),
               formatday(getnextdayn(d, 3)),
               formatday(getnextdayn(d, 4))],divider=True)
    t.add_row(["",
               formatevents(getnextdayn(d, 0)),
               formatevents(getnextdayn(d, 1)),
               formatevents(getnextdayn(d, 2)),
               formatevents(getnextdayn(d, 3)),
               formatevents(getnextdayn(d, 4))])
    print(t)
    d=getnextmonday(d)
    w+=1
    if d<sem["end"]:
        print("")

#### Gen slots tables
for s in sem["slots"]:
    t = PrettyTable()
    t.field_names = ["Day", "Time", "Room"]
    t.align["Day"]="l"
    for dayname in ["monday","tuesday","wednesday","thursday", "friday"]:
        p=sem["slots"][s][dayname]
        timeStr=gettime(p["start"])+"-"+gettime(p["end"]) if p["start"] is not None else ""
        room=p["room"] if p["room"] is not None else ""
        if timeStr != "" or room != "":
            t.add_row([dayname.capitalize(),timeStr,room])
    print(s+":")
    print(t)