#!/usr/bin/env python3

import os
import re
import subprocess
import sys
from datetime import datetime
import parsedatetime

TAGS = ['t', 'due']

class todo_item:
    tag = []
    full_tag = ""
    date = None
    text = ""
    fancy_text = ""

    def __init__(self, text):
        self.text = text
        try:
            self.full_tag = re.findall("[^ ]+:\\d{4}-\\d{2}-\\d{2}", text)[0].strip()
            self.tag = self.full_tag.split(":")
            self.date = datetime.strptime(self.tag[1], "%Y-%m-%d")
        except IndexError:
            pass

    def __repr__(self):
        if self.text:
            return self.text
        else:
            return ''

    def fancy_print(self, relative=False):
        if self.date < datetime.today():
            #if the date has already passed, wrap with bold/unbold escapes
            fancy_text = self.text.replace(
                self.full_tag, '\033[1m' + self.full_tag + '\033[22m')
        else:
            fancy_text = self.text

        if relative:
            difference = (self.date - datetime.now()).days + 1
            fancy_text = fancy_text.replace(
                self.full_tag, "{}:{} days".format(self.tag[0], difference))

        return fancy_text

def add(tag, date_input, desc):
    print(tag, date_input, desc)
    cal = parsedatetime.Calendar()
    time_struct, parse_status = cal.parse(date_input)
    date = datetime(*time_struct[:6]).strftime("%Y-%m-%d")
    subprocess.call(["todo.sh", "add", desc, tag + ":" + date])

def due(search_term="", relative=False):
    tagList = "\|".join(TAGS)
    command = ["todo.sh", "list", tagList, search_term]
    lines = subprocess.check_output(command).decode(encoding='UTF-8').split('\n')
    items =  [item for item in [todo_item(line) for line in lines] if item.date is not None]
    items.sort(key= lambda x: x.date)

    for i in items:
        print(i.fancy_print(relative))

if __name__ == '__main__':
    if sys.argv[1] == "usage":
        print("    due [-r] [TERM...]\n"
              "      Shows all items with a t: or due: tag that match TERM. '-r' makes dates relative\n"
              "    due add [due date] [tag] [description]\n"
              "      Adds a task with a dated tag")

        exit(0)

    if len(sys.argv) >= 3:
        if sys.argv[2] == "-r":
            relative = True
            del sys.argv[2]
        elif sys.argv[2] == "add":
            add(sys.argv[3], sys.argv[4], " ".join(sys.argv[5:]))
            exit(0)
        else:
            relative = False
        search_term = " ".join(sys.argv[2:])
        due(search_term, relative)
    else:
        due()