from flask_nav.renderers import Renderer, SimpleRenderer
from dominate import tags
import asteval
import operator as op
import textwrap
import math
import sys
import random
import string
from functools import wraps
from urllib.request import urlopen
from io import BytesIO
import subprocess as SP
import shlex
import json
import os

from PIL import Image
from PIL import ImageFont
from PIL import ImageDraw


def handle_config(cfg=None):
    if cfg is None:
        if os.path.isfile("config.json"):
            with open("config.json") as fh:
                return json.load(fh)
    with open("config.json", "w") as fh:
        cfg = json.dump(cfg, fh, indent=4)
    return


def with_application_context(app):
    def inner(func):
        @wraps(func)
        def wrapper(*args, **kwargs):
            with app.app_context():
                return func(*args, **kwargs)

        return wrapper

    return inner


def getsize(text, font_size):
    font = ImageFont.truetype("arial.ttf", font_size)
    return font.getsize_multiline(text)


def does_text_fit(text, width, height, font_size):
    w, h = getsize(text, font_size)
    return w < width and h < height


def make_placeholder_image(text, width, height, poster=None, wrap=0):
    width = int(width)
    height = int(height)
    wrap = int(wrap)
    font_size = 1
    bounds = (0, 1)
    if wrap:
        text = textwrap.fill(text, wrap)
    while True:
        if not does_text_fit(text, width, height, bounds[1]):
            break
        bounds = (bounds[1], bounds[1] * 2)
    prev_bounds = None
    while True:
        if does_text_fit(text, width, height, bounds[1]):
            bounds = (int(round(sum(bounds) / 2, 0)), bounds[1])
        else:
            bounds = (bounds[0], int(round(sum(bounds) / 2, 0)))
        if prev_bounds == bounds:
            break
        prev_bounds = bounds
    font_size = bounds[0]
    io = BytesIO()
    im = Image.new("RGBA", (width, height), "#222")
    draw = ImageDraw.Draw(im)
    font = ImageFont.truetype("arial.ttf", font_size)
    w, h = getsize(text, font_size)
    if poster:
        try:
            with urlopen(poster) as fh:
                poster = Image.open(fh)
        except Exception as e:
            poster = None
        else:
            poster_size = poster.size
            factor = width / poster_size[0]
            new_size = (
                math.ceil(poster_size[0] * factor),
                math.ceil(poster_size[1] * factor),
            )
            poster = poster.resize(new_size)
            mid = -int((poster.size[1] - height) / 2)
            im.paste(poster, (0, mid))
    draw.text(((width - w) / 2, (height - h) / 2), text, fill="#eee", font=font)
    im.save(io, "PNG")
    io.seek(0)
    return io


def make_tree(files, child_key="children"):
    tree = {}
    for file in files:
        root = tree
        parts = file["name"].split("/")
        for item in parts:
            if item not in root:
                root[item] = {}
            prev_root = root
            root = root[item]
        prev_root[item] = {"__info__": file}
    return tree


class BootsrapRenderer(Renderer):
    def visit_Navbar(self, node):
        sub = []
        for item in node.items:
            sub.append(self.visit(item))
        ret = tags.ul(sub, cls="navbar-nav mr-auto")
        return ret

    def visit_View(self, node):
        classes = ["nav-link"]
        if node.active:
            classes.append("active")
        return tags.li(
            tags.a(node.text, href=node.get_url(), cls=" ".join(classes)),
            cls="nav-item",
        )

    def visit_Subgroup(self, node):
        url = "#"
        classes = []
        child_active = False
        if node.title == "":
            active = False
            for item in node.items:
                if item.active:
                    classes.append("active")
                    break
            node, *children = node.items
            for c in children:
                if c.active:
                    child_active = True
                    break
            node.items = children
            node.title = node.text
            url = node.get_url()
        dropdown = tags.ul(
            [
                tags.li(
                    tags.a(
                        item.text,
                        href=item.get_url(),
                        cls="nav-link active" if item.active else "nav-link",
                        style="",
                    ),
                    cls="nav-item",
                )
                for item in node.items
            ],
            cls="dropdown-menu ",
        )
        link = tags.a(
            node.title,
            href=url,
            cls="nav-link active" if node.active else "nav-link",
            style="",
        )
        toggle = tags.a(
            [],
            cls="dropdown-toggle nav-link active"
            if child_active
            else "dropdown-toggle nav-link",
            data_toggle="dropdown",
            href="#",
            style="padding-left: 0px; padding-top: 10px",
        )
        # almost the same as visit_Navbar, but written a bit more concise
        return [link, tags.li([toggle, dropdown], cls="dropdown nav-item")]


def eval_expr(expr, ctx=None):
    aeval = asteval.Interpreter(minimal=True, use_numpy=False, symtable=ctx)
    return aeval(expr)


def sort_by(values, expr):
    return sorted(value, key=lambda v: eval_expr(expr, v))

def genpw(num=20):
    return "".join(random.choice(string.ascii_lowercase+string.ascii_uppercase+string.digits) for _ in range(num))