import os
from mimetypes import guess_type
from random import shuffle

from flask import Response, abort, json, jsonify, request
from flask_login import current_user, login_user

from floatapp import app
from floatapp.jsonp import jsonp
from floatapp.login import (admin_required, admin_user, is_authenticated,
                            login_required, photo_user, query_is_admin_user,
                            query_is_photo_user)
from process import send_process
from TreeWalker import TreeWalker

cwd = os.path.dirname(os.path.abspath(__file__))


@app.route("/scan")
@admin_required
def scan_photos():
    global cwd
    response = send_process([
            "stdbuf",
            "-oL",
            os.path.abspath(os.path.join(cwd, "../venv/bin/python")),
            os.path.abspath(os.path.join(cwd, "../main.py")),
            os.path.abspath(app.config["ALBUM_PATH"]),
            os.path.abspath(app.config["CACHE_PATH"])
        ],
        os.path.join(cwd, "scanner.pid"))
    response.headers.add("X-Accel-Buffering", "no")
    response.cache_control.no_cache = True
    return response


@app.route("/auth")
def login():
    success = False
    if current_user.is_authenticated:
        success = True
    elif (query_is_photo_user(request.form) or
            query_is_photo_user(request.args)):
        success = login_user(photo_user, remember=True)
    elif (query_is_admin_user(request.form) or
            query_is_admin_user(request.args)):
        success = login_user(admin_user, remember=True)
    if not success:
        abort(403)
    return ""


def cache_base(path):
    path = path.replace(
        '/', '-').replace(
        ' ', '_').replace(
        '(', '').replace(
        '&', '').replace(
        ',', '').replace(
        ')', '').replace(
        '#', '').replace(
        '[', '').replace(
        ']', '').replace(
        '"', '').replace(
        "'", '').replace(
        '_-_', '-').lower()

    while path.find("--") != -1:
        path = path.replace("--", "-")

    while path.find("__") != -1:
        path = path.replace("__", "_")

    if len(path) == 0:
        path = "root"

    return path


auth_list = []


def read_auth_list():
    global auth_list, cwd
    f = open(os.path.join(cwd, "auth.txt"), "r")
    paths = []
    for path in f:
        path = path.strip()
        paths.append(path)
        paths.append(cache_base(path))
    f.close()
    auth_list = paths


# TODO: Make this run via inotify
read_auth_list()


def check_permissions(path):
    if not is_authenticated():
        for auth_path in auth_list:
            if path.startswith(auth_path):
                abort(403)


@app.route("/albums/<path:path>")
def albums(path):
    check_permissions(path)
    return accel_redirect(
        app.config["ALBUM_ACCEL"], app.config["ALBUM_PATH"], path)


@app.route("/cache/<path:path>")
def cache(path):
    check_permissions(path)
    return accel_redirect(
        app.config["CACHE_ACCEL"], app.config["CACHE_PATH"], path)


def accel_redirect(internal, real, relative_name):
    real_path = os.path.join(real, relative_name)
    internal_path = os.path.join(internal, relative_name)
    if not os.path.isfile(real_path):
        abort(404)
    mimetype = None
    types = guess_type(real_path)
    if len(types) != 0:
        mimetype = types[0]
    response = Response(mimetype=mimetype)
    response.headers.add("X-Accel-Redirect", internal_path)
    response.cache_control.public = True
    if mimetype == "application/json":
        response.cache_control.max_age = 3600
    else:
        response.cache_control.max_age = 29030400
    return response


@app.route("/photos")
@jsonp
def photos():
    f = open(os.path.join(app.config["CACHE_PATH"], "all_photos.json"), "r")
    photos = json.load(f)
    f.close()
    if not is_authenticated():
        def allowed(photo):
            for auth_path in auth_list:
                if photo.startswith(auth_path):
                    return False
            return True
        photos = [photo for photo in photos if allowed(photo)]
    count = int(request.args.get("count", len(photos)))
    random = request.args.get("random") == "true"
    if random:
        shuffle(photos)
    else:
        photos.reverse()
    response = jsonify(photos=photos[0:count])
    response.cache_control.no_cache = True
    return response