#!/usr/bin/env python3

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

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

from dataclasses import dataclass

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

@dataclass
class Story:
    id: int
    title: str
    link: str
    author: str
    votes: int
    comments: int

def main(stdscr):
    stdscr.clear()

    height, width = stdscr.getmaxyx()
    num_stories = curses.LINES - 2 # headline and detail
    # Query Hacker News API for top stories and their titles/links
    url = 'https://hacker-news.firebaseio.com/v0/topstories.json'
    r = requests.get(url)
    if not r.ok:
        raise Exception('Error fetching data from Hacker News API')
    ids = r.json()[:10]
    stories = []
    for idx, i in enumerate(ids):
        stdscr.clear()
        stdscr.addstr(f'{num_stories}\n')
        stdscr.addstr(f'[{spinner_states[idx%4]}] Getting stories...')
        stdscr.refresh()
        story_url = f'https://hacker-news.firebaseio.com/v0/item/{i}.json'
        s = requests.get(story_url).json()
        stories.append(Story(s['id'],
                             s['title'], 
                             s['url'] if 'url' in s else 'No URL',
                             s['by'], s['score'],
                             len(s['kids']) if 'kids' in s else 0))

    # 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 '   '
            #text = f'{prefix}{story.title} ({story.link})\n'
            # calculate length of line
            text = f'{prefix} ()\n'
            chars_available = width - len(text)
            max_title_len = (chars_available//3)*2
            max_url_len = chars_available//3

            text = f'{prefix}{(story.title[:max_title_len-1] + "…") if len(story.title) > max_title_len else story.title} ({story.link[:max_url_len-1] + "…" if len(story.link) > max_url_len else story.link})\n'

            stdscr.addstr(text)
            if i == current_pos:
                detail = f'    by {story.author} | {story.comments} comments | {story.votes} points\n'
                stdscr.addstr(detail)

        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:
            #title, link = stories[current_pos]
            #print(f'\nOpening link: {link}\n')
            webbrowser.open(stories[current_pos].link)

curses.wrapper(main)