import json
from glob import glob
from time import time_ns
import datetime
import os
from pwd import getpwuid
import sys
from subprocess import run
import tempfile
from math import floor
from re import compile

home = os.path.expanduser("~/.bink")
our_path = "/town/our/data/.bink"
filters = []
filters_path = os.path.expanduser("~/.binkfilters")
max_body_length = 64_000
helptext = """see https://git.tilde.town/nebula/bink for details
--help or -h: show this message
--pipe or -p: use stdin as post content. ex `echo "hello!" | town bink --pipe`
--dump or -d: print all posts in a json object"""

try:
    os.mkdir(home)
except FileExistsError:
    pass

try:
    os.mkdir(our_path)
except FileExistsError:
    pass
except FileNotFoundError:
    our_path = None

try:
    with open(filters_path, "r") as f:
        filters = json.load(f)
except FileNotFoundError:
    with open(filters_path, "w") as f:
        json.dump(filters, f)

try:
    editor = os.environ["EDITOR"]
except KeyError:
    editor = "nano"

def create_post(body):
    with open(f"{home}/{time_ns()}", "w", encoding="UTF-8") as f:
        f.write(body)

def file_object(path, our=False):
    split = path.split("/")
    # example input: /home/nebula/.bink/999
    # output: (999, "nebula", "/home/nebula/.bink/999")
    return (int(split[-1]), split[2] if not our else "our", path)

def glob_posts(path):
    return [
        file_object(post_path) for post_path in glob(path)
        if os.path.isfile(post_path) and not os.path.islink(post_path)
    ]

def generate_feed(before=None, count=200):
    posts = glob_posts("/home/**/.bink/*")
    if our_path:
        posts += glob_posts(f"{our_path}/*")
    for post in posts.copy():
        if post[1] in filters:
            posts.remove(post)
    if before:
        posts = [post for post in posts if post[0] < before]
    posts.sort(key=lambda x: x[0], reverse=True)
    blogs = []
    for time, user, path in posts[:count]:
        # try:
        with open(path, "r", encoding="UTF-8") as f:
            body = f.read()
        # except
        obj = {
            "user": user,
            "time": time,
            "body": body[:max_body_length],
        }
        blogs.append(obj)
    return blogs

if len(sys.argv) > 1:
    if sys.argv[1] in ("--help", "-h"):
        print(helptext)
        exit(0)
    elif sys.argv[1] in ("--dump", "-d"):
        with open("/dev/stdout", "w") as f:
            json.dump(generate_feed(), f)
        exit(0)
    elif sys.argv[1] in ("--pipe", "-p"):
        try:
            with open("/dev/stdin", "r", encoding="UTF-8") as f:
                body = f.read().strip()
            if body:
                create_post(body)
            exit(0)
        except KeyboardInterrupt:
            exit(0)
    else:
        create_post(" ".join(sys.argv[1:]))
        exit(0)

import urwid

current_user = getpwuid(os.getuid()).pw_name
name_re = compile(f"(?<!\w)[@~]?{current_user}")
footer = "[c]reate [r]efresh [q]uit | scrolling: arrows, j/k, space, page up/down, ctrl-d/ctrl-u"
attrmap = [
    ("bold", "default,bold", "default"),
    ("reverse", "standout", "default"),
    ("highlight", "light magenta", "default")
]

class App():
    def __init__(self):
        self.walker = urwid.SimpleFocusListWalker([
            self.post_to_widget(post) for post in generate_feed()
        ])
        self.loop = urwid.MainLoop(
            urwid.Frame(
                ActionBox(self.walker),
                footer=urwid.Text(("reverse", footer))
            ),
            palette=attrmap,
            handle_mouse=False
        )

    def update(self, before=None, clear=True):
        if clear:
            self.walker.clear()
        for post in generate_feed(before=before):
            self.walker.append(self.post_to_widget(post))

    def post_to_widget(self, post):
        body = post["body"]
        post_user = post["user"]
        time_seconds = post["time"] / 1_000_000_000
        stamp = datetime.datetime.fromtimestamp(time_seconds)
        if current_user != post_user and name_re.search(body):
            widget_body = []
            index = 0
            for match in name_re.finditer(body):
                start, end = match.span()
                before = body[index:start]
                highlight = body[start:end]
                widget_body.append(before)
                widget_body.append(("highlight", highlight))
                index = end
            widget_body.append(body[index:])
            body = widget_body
        pile = urwid.Pile([
            urwid.Text([("bold", f"~{post_user}"), " @ ", stamp.strftime("%H:%M (%A, %B %d, %Y)")]),
            urwid.Text(body),
            urwid.Divider()
        ])
        return pile

    def write_with_editor(self):
        self.loop.stop()
        tmp = tempfile.NamedTemporaryFile()
        run([editor, tmp.name])
        with open(tmp.name, "r") as f:
            body = f.read().strip()
        if body:
            create_post(body)
        self.update()
        self.loop.start()

class ActionBox(urwid.ListBox):
    def keypress(self, size, key):
        keyl = key.lower()
        if keyl == "c":
            app.write_with_editor()
        elif keyl == "r":
            app.update()
        elif keyl in ("q", "x"):
            raise urwid.ExitMainLoop
        elif keyl == " ":
            super().keypress(size, "page down")
        elif keyl in ("j", "n", "ctrl n"):
            super().keypress(size, "down")
        elif keyl in ("k", "p", "ctrl p"):
            super().keypress(size, "up")
        elif key == "g":
            super().keypress(size, "home")
        elif key == "G":
            super().keypress(size, "end")
        elif key == "ctrl d":
            for i in range(1, floor(size[1] / 2)):
                super().keypress(size, "down")
        elif key == "ctrl u":
            for i in range(1, floor(size[1] / 2)):
                super().keypress(size, "up")
        super().keypress(size, key)
            
app = App()
try:
    app.loop.run()
except (KeyboardInterrupt, urwid.ExitMainLoop):
    app.loop.stop()
    exit(0)