#!/usr/bin/env python3

#TODO: make sure things dont explode no matter what terminal size
# x prevent linebreaks in a single story
# x only load as many stories as fit
# -> refresh on resize

import requests
from bs4 import BeautifulSoup as Soup
import curses
import webbrowser

import api

spinner_states = ['-', '\\', '|', '/']


def footer(stdscr, content):
    stdscr.addstr(curses.LINES-1, 0, content, curses.A_REVERSE)


def main(stdscr):
    stdscr.clear()

    _, width = stdscr.getmaxyx();
    num_stories = curses.LINES - 3 # headline, detail, footer

    topstories = api.get_topstories()
    stories = []
    for idx, i in enumerate(topstories[:num_stories]):
        stdscr.clear()
        footer(stdscr, f'[{spinner_states[idx%4]}] Loading stories...')
        stdscr.refresh()
        stories.append(api.get_story(i))

    # Display list of stories in terminal window with arrow key navigation
    current_pos = 0
    while True:
        stdscr.clear()
        stdscr.addstr('Hacker News Top Stories:\n')
        for i, story in enumerate(stories):
            prefix = '>>> ' if i == current_pos else '   '
            # calculate length of line
            text = f'{prefix} ()\n'
            chars_available = width - len(text)
            max_title_len = min((chars_available//3)*2, len(story.title))
            max_url_len = chars_available - max_title_len

            title = story.title[:max_title_len-1] + "…" if len(story.title) > max_title_len else story.title
            link = story.link.replace('https://', '').replace('http://', '')
            link = link[:max_url_len-1] + "…" if len(link) > max_url_len else link

            text = '{}{} ({})\n'.format(prefix, title, link.replace('https://', '').replace('http://', ''))
            stdscr.addstr(text)
            if i == current_pos:
                detail = f'    by {story.author} | {story.comments} comments | {story.votes} points\n'
                stdscr.addstr(detail)
        footer(stdscr, f'Loaded {num_stories} stories.')

        stdscr.refresh()
        c = stdscr.getch()
        if c == ord('q'):  # Quit
            break
        elif c == curses.KEY_UP:
            current_pos -= 1
            if current_pos < 0:
                current_pos = len(stories)-1
        elif c == curses.KEY_DOWN:
            current_pos += 1
            if current_pos >= len(stories):
                current_pos = 0
        elif c == ord('c'):
            webbrowser.open(f'https://news.ycombinator.com/item?id={stories[current_pos].id}')
        elif c == curses.KEY_ENTER or c == 10:
            webbrowser.open(stories[current_pos].link)

curses.wrapper(main)