#! /usr/bin/python3
from functools import partial
from collections import defaultdict
from os import environ

from flask import abort, Flask, render_template, flash, request, send_from_directory, jsonify, g
from werkzeug.local import Local, LocalProxy, LocalManager
from flask_appconfig import AppConfig
from flask_login import LoginManager, login_required, login_user
from flask_wtf.csrf import CSRFProtect
from flask_caching import Cache

from urllib.parse import quote, unquote
from json import dumps, loads
from admin import Admin
#from werkzeug.contrib.cache import simpleCache

from posts import Posts
from projects import getProjects

login_manager = LoginManager()

#memcache = simpleCache(['127.0.0.1:11211'])
cache = Cache(config={'CACHE_TYPE': 'simple'})

page_titles = {
                "about" : "About Me",
                "projects" : "Software",
                "links" : "Links",
                "browse" : "Wesley Kerfoot"
                }

def cacheit(key, thunk):
    """
    Explicit simple caching
    """
    cached = cache.get(quote(key))
    if cached is None:
        print("cache miss for %s" % key)
        result = thunk()
        cache.set(quote(key), result)
        return result
    print("cache hit for %s" % key)
    return cached

def get_posts():
    posts = getattr(g, "posts", None)
    if posts is None:
        posts = g._posts = Posts(environ.get("COUCHDB_USER"),
                                 environ.get("COUCHDB_PASSWORD"),
                                 environ.get("COUCHDB_NAME"))
    return posts

def get_initial():
    initial_post = getattr(g, "initial_post", None)
    if initial_post is None:
        initial_post = g._initial_post = posts.getinitial()
    return initial_post

def NeverWhere(configfile=None):
    app = Flask(__name__)
    app.config["TEMPLATES_AUTO_RELOAD"] = True
    app.config["SECRET_KEY"] = environ.get("SECRET_KEY")
    app.config["COUCHDB_SERVER"] = "http://127.0.0.1:5984"
    app.config["COUCHDB_DATABASE"] = "blog"
    #def favicon():
        #return send_from_directory("/srv/http/goal/favicon.ico",
                                   #'favicon.ico', mimetype='image/vnd.microsoft.icon')

    @app.route("/blog/styles/<path:path>")
    def send_styles(path):
        return send_from_directory("/styles", path)

    @app.route("/blog/scripts/<path:path>")
    def send_scripts(path):
        return send_from_directory("/scripts", path)

    # Set template variables to be injected
    @app.context_processor
    def inject_variables():
        postcontent = defaultdict(str)
        postcontent["title"] = initial_post["title"]
        return {
                "quote" : quote,
                "dumps" : dumps,
                "results" : dumps([]),
                "postid" : initial_post["_id"],
                "postcontent" : postcontent,
                "links" : dumps([]),
                "projects" : dumps([]),
                "category_filter" : dumps(False),
                "categories" : cacheit("categories", lambda : dumps(posts.categories())),
                "titles" : page_titles
        }

    @login_manager.user_loader
    def load_user(user_id):
        return Admin

    @app.route("/blog/admin_login", methods=("GET", "POST"))
    def admin_login():
        password = request.args.get("password")
        success = False
        if password == environ.get("ADMIN_PASSWORD"):
            print("logged in successfully")
            success = True
            login_user(Admin())
        else:
            print("did not log in successfully")
        return render_template("login.html", success=success)

    # page routes
    @cache.cached(timeout=50)
    @app.route("/blog/posts/", methods=("GET",))
    def renderInitial():
        post = dict(initial_post)
        return render_template("index.html",
                               postid=initial_post["_id"],
                               page="posts",
                               postcontent=post)

    @cache.cached(timeout=50)
    @app.route("/blog/projects/", methods=("GET",))
    def showProjects():
        return render_template("index.html", page="projects")

    @cache.cached(timeout=50)
    @app.route("/blog/links/", methods=("GET",))
    def showLinks():
        return render_template("index.html",
                               links=dumps(
                                        list(
                                            posts.links(json=False))),
                                            page="links"
                                        )

    @cache.cached(timeout=50)
    @app.route("/blog/about/", methods=("GET",))
    def showAbout():
        return render_template("index.html", page="about")

    @cache.cached(timeout=50)
    @app.route("/blog/", methods=("GET", "POST"))
    def index():
        return browse_root()

    # get the next post
    @cache.cached(timeout=50)
    @app.route("/blog/posts/<_id>", methods=("GET",))
    def renderPost(_id):
        post_content = dict(loads(
                            cacheit(_id,
                                    lambda: dumps(posts.getpost(_id, json=False)))
                            ))


        return render_template("index.html",
                               page="posts",
                               postcontent=post_content)


    @app.route("/blog/browse/")
    def browse_root():
        results = posts.browse(4, json=False)
        return render_template("index.html",
                                page="browse",
                                results=dumps(results))

    @app.route("/blog/browse/<category>/")
    def browse_categories_(category):
        """
        Get the first page of categories
        """
        results = posts.browse(4, categories=[category], json=False)
        return render_template("index.html",
                                page="browse",
                                category_filter=dumps([category]),
                                results=dumps(results))

    @cache.cached(timeout=50)
    @app.route("/blog/switchpost/<pid>")
    def getpostid(pid):
        return posts.iterpost(startkey=pid)

    # get the post previous to this one
    @cache.cached(timeout=50)
    @app.route("/blog/prevpost/<pid>")
    def prevpost(pid):
        return posts.iterpost(endkey=pid)

    # get the contents of any post
    # rendered in JSON
    @cache.cached(timeout=50)
    @app.route("/blog/getpost/<_id>/")
    def getpost(_id):
        return posts.getpost(_id)

    # XXX should use unpublished
    @cache.cached(timeout=50)
    @app.route("/blog/getrawpost/<_id>")
    def getrawpost(_id):
        return posts.getpost(_id, convert=False, unpublished=True)

    # get the first post of a given category
    @cache.cached(timeout=50)
    @app.route("/blog/getpost/<category>")
    def bycategory(category):
        return posts.getbycategory(category)

    # XXX get the id of every post
    # Needs to be fixed
    @app.route("/blog/allposts")
    def allposts():
        return posts.allposts()

    # remove a post
    @app.route("/blog/deletepost/<_id>")
    @login_required
    def delete(_id):
        return posts.delete(_id)

    # editor routes

    @app.route("/blog/editor/", methods=("GET", "POST"))
    @login_required
    def editor():
        """
        View the post editor, requires auth
        """
        return render_template("write.html")

    @app.route("/blog/insert/<category>", methods=("POST",))
    @login_required
    def insert(category):
        """
        Insert a post, requires auth
        """

        author = request.form.get("author", "no author")
        title = request.form.get("title", "no title")
        content = request.form.get("content", "no content")
        draft = loads(request.form.get("draft", "false"))
        tags = [t for t in request.form.get("tags", "programming").split(",") if t]
        postid = request.form.get("_id", False)

        post = {
                "author" : author,
                "title" : title,
                "content" : content,
                "categories" : tags,
                "_id" : postid,
                "draft" : draft
                }

        cache.clear()
        return posts.savepost(**post)

    @app.route("/blog/glinks/", methods=("GET",))
    def links():
        """
        Get links
        """
        return posts.links()

    @app.route("/blog/ghprojects", methods=("GET",))
    def projects():
        return jsonify(loads(cacheit("projects", getProjects)))

    @app.route("/blog/getbrowse/<limit>")
    def getbrowsefirst(limit):
        return posts.browse(limit)

    @app.route("/blog/getbrowselim/<limit>/<startkey>")
    def getbrowse(limit, startkey):
        return posts.browse(limit, startkey=startkey)

    # forwards pagination
    @app.route("/blog/getbrowse/<category>/<limit>/<startkey>")
    def getbycategory(category, limit, startkey):
        return posts.browse(limit, startkey=startkey, categories=[category])

    @app.route("/blog/getbrowse/<category>/<limit>/")
    def getbycategoryinitial(category, limit):
        return posts.browse(limit, categories=[category])

    # backwards pagination
    @app.route("/blog/prevbrowse/<limit>/<endkey>/")
    def prevbrowse(limit, endkey):
        return posts.browse(limit, endkey=endkey)

    @app.route("/blog/prevbrowse/<category>/<limit>/<endkey>/")
    def prevbycategory(category, limit, endkey):
        return posts.browse(limit, endkey=endkey, categories=[category])

    return app

if __name__ == "__main__":

    app = NeverWhere()

    @app.teardown_appcontext
    def teardown_couchdb(exception):
        posts = getattr(g, 'posts', None)
        if posts is not None:
            del posts.db

    csrf = CSRFProtect()

    csrf.init_app(app)

    cache.init_app(app)

    posts = LocalProxy(get_posts)

    initial_post = LocalProxy(get_initial)

    login_manager.init_app(app)

    app.run(host="0.0.0.0", port=6969, debug=True)