#!/usr/bin/env python3
import uuid
from datetime import datetime, timezone
from calendar import month_abbr

start_year = 2025

def get_event_date(date_str):
    parts = date_str.split()
    if len(parts) != 2:
        return None
    month_str, day_str = parts
    month = list(month_abbr).index(month_str)
    day = int(day_str)
    # If the month is September (9) or later, use start_year; otherwise, the next year.
    year = start_year if month >= 9 else start_year + 1
    return datetime(year, month, day).date()

events = []
with open('reading_plan.md', 'r') as f:
    # Read only the lines that begin with a pipe symbol ("|")
    lines = [line for line in f if line.strip().startswith("|")]
    if len(lines) < 3:
        raise Exception("Not enough rows in markdown table")
    # Skip header and separator lines
    data_lines = lines[2:]
    for line in data_lines:
        cols = [c.strip() for c in line.strip().strip("|").split("|")]
        if len(cols) < 4:
            continue
        date_val = get_event_date(cols[0])
        if not date_val:
            continue
        summary = f"Day {cols[1]} Reading"
        description = f"Old Testament: {cols[2]}\\nNew Testament: {cols[3]}"
        events.append((date_val, summary, description))

with open('reading_plan.ics', 'w') as f:
    f.write("BEGIN:VCALENDAR\n")
    f.write("VERSION:2.0\n")
    f.write("PRODID:-//OSB in one Year//EN\n")
    for date_val, summary, description in events:
        f.write("BEGIN:VEVENT\n")
        uid = str(uuid.uuid4())
        # Use timezone-aware UTC time for DTSTAMP
        dtstamp = datetime.now(timezone.utc).strftime("%Y%m%dT%H%M%SZ")
        dtstart = date_val.strftime("%Y%m%d")
        f.write("UID:" + uid + "\n")
        f.write("DTSTAMP:" + dtstamp + "\n")
        f.write("DTSTART;VALUE=DATE:" + dtstart + "\n")
        f.write("SUMMARY:" + summary + "\n")
        f.write("DESCRIPTION:" + description + "\n")
        f.write("END:VEVENT\n")
    f.write("END:VCALENDAR\n")