#!/usr/bin/env python3
"""Smol “three good things” notepad."""

import datetime
import re

import smolcgi as scgi
scgi.require_client_cert()


def get_month_dir(year, month):
    return scgi.get_user_dir() / f"{str(year).zfill(4)}-{str(month).zfill(2)}"


def get_day_file(year, month, day):
    filename = str(day).zfill(2) + ".gmi"
    return get_month_dir(year, month) / filename


def reply_home():
    scgi.header(20, "text/gemini")
    print("# Trikiff! 🌄🥰🌃\n")

    print("## Actions\n")
    scgi.link("/new/today", "Add kiffs of today")
    scgi.link("/new/yesterday", "Add kiffs of yesterday")
    scgi.link("/new", "Add kiffs for another day")
    print()

    print("## This month\n")
    today = datetime.date.today()
    month_dir = get_month_dir(today.year, today.month)
    if month_dir.is_dir():
        print_month(month_dir)
    else:
        print("No kiffs yet!")

    print("## Past months\n")
    scgi.link("/browse", "Browse archives")


def reply_new(date: datetime.date):
    if (kiffs := scgi.query_string_dec):
        kiffs = filter(lambda s: s, kiffs.split(";"))
        kiffs = map(lambda s: "* " + s.strip(), kiffs)
        content = "\n".join(kiffs) + "\n"
        day_file = get_day_file(date.year, date.month, date.day)
        if not (parent_dir := day_file.parent).exists():
            parent_dir.mkdir(parents=True)
        with open(get_day_file(date.year, date.month, date.day), "at") as f:
            f.write(content)
        scgi.redirect_temp(f"{scgi.script_name}")
    else:
        scgi.require_input("Input one or more kiffs (separated with ';')")


def reply_prompt_day():
    if (query := scgi.query_string_dec):
        try:
            if (match := re.match(r"^\d{1,2}$", query)):
                date = datetime.date.today().replace(day=int(match.group(0)))
            elif (match := re.match(r"^\d{4}-\d{2}-\d{2}$", query)):
                date = datetime.date.fromisoformat(match.group(0))
            else:
                scgi.bad_request("Invalid day or date format")
        except ValueError:
            scgi.bad_request("Invalid day or date format")
        scgi.redirect_temp(f"{scgi.script_name}/new/{date.isoformat()}")
    else:
        scgi.require_input(
            "Which day? You can input only the day for the current month, "
            "or a complete date using the YYYY-MM-DD format."
        )


def reply_browse(directory=None):
    if directory:
        path = scgi.get_user_dir() / directory
        if not path.is_dir():
            scgi.not_found()
        scgi.header(20, "text/gemini")
        print(f"# Kiffs for {directory}\n")
        print_month(path)
    else:
        scgi.header(20, "text/gemini")
        print("# Trikiff archives 📜\n")
        for path in sorted(scgi.get_user_dir().iterdir(), reverse=True):
            if not path.is_dir():
                continue
            scgi.link(f"/browse/{path.name}", path.name)


def print_month(month_dir):
    for day_filename in sorted(month_dir.iterdir(), reverse=True):
        day = day_filename.name[:-4]
        print(f"### {day}")
        with open(day_filename, "rt") as f:
            print(f.read())


if scgi.path_info == "/new/today":
    reply_new(datetime.date.today())
elif scgi.path_info == "/new/yesterday":
    reply_new(datetime.date.today() - datetime.timedelta(days=1))
elif scgi.path_info == "/new":
    reply_prompt_day()
elif (match := re.match(r"^/new/(\d{4}-\d{2}-\d{2})$", scgi.path_info)):
    try:
        reply_new(datetime.date.fromisoformat(match.group(1)))
    except ValueError:
        scgi.not_found()
elif scgi.path_info == "/browse":
    reply_browse()
elif (match := re.match(r"^/browse/(\d{4}-\d{2})$", scgi.path_info)):
    reply_browse(directory=match.group(1))
else:
    reply_home()