import sqlite3
from sqlite3 import Error
import os
import functools
import operator
from Render import Article


class Cache:
    def __init__(self, api):
        self.conn = None
        self.api = api
        create_categories = """create table if not exists categories (
                                   id text primary key,
                                   name text not null,
                                   unread_count integer,
                                   timestamp integer,
                                   date text
                               )
                            """
        create_feeds = """create table if not exists feeds (
                              id text primary key,
                              name text not null,
                              unread_count integer,
                              timestamp integer,
                              date text,
                              category_id text,
                              foreign key (category_id) references categories (id)
                          )
                       """
        create_articles = """create table if not exists articles (
                              id text primary key,
                              title text not null,
                              timestamp integer,
                              date text,
                              content text,
                              url text,
                              is_read boolean,
                              origin text,
                              category_id text,
                              foreign key (category_id) references categories (id),
                              foreign key (origin) references feeds (id)
                          )
                       """
        create_links = """create table if not exists links (
                              id text,
                              url text not null,
                              foreign key (id) references articles (id)
                          )
                       """
        try:
            self.conn = sqlite3.connect(os.path.expanduser("~") + '/.config/inomnibus/cache.db')
            self.conn.cursor().execute(create_categories)
            self.conn.cursor().execute(create_feeds)
            self.conn.cursor().execute(create_articles)
            self.conn.cursor().execute(create_links)

        except Error as e:
            print(e)

    def getArticle(self, id):
        cur = self.conn.cursor()
        cur.execute("""select title,content,url from articles where id = ?""", (id,))
        return cur.fetchone()

    def getArticleLinks(self, id):
        cur = self.conn.cursor()
        cur.execute("""select url from links where id = ?""", (id,))
        links = functools.reduce(operator.iconcat, cur.fetchall(), [])
        return links

    def getArticlesFromFeed(self, feed_id):
        cur = self.conn.cursor()
        cur.execute("""select * from articles where origin = ?""", (feed_id,))
        return cur.fetchall()

    def getArticlesFromCategory(self, category_id):
        cur = self.conn.cursor()
        cur.execute("""select * from articles where category_id = ?""", (category_id,))
        return cur.fetchall()

    def getCategories(self):
        cur = self.conn.cursor()
        cur.execute("""select * from categories where unread_count != 0 order by timestamp desc""")
        return cur.fetchall()

    def getFeeds(self, category_id):
        cur = self.conn.cursor()
        cur.execute("""select * from feeds where category_id = ? and unread_count != 0 order by timestamp desc""", (category_id,))
        return cur.fetchall()

    def refresh(self):
        self.api.refresh()
        for item in self.api.unreadCounts.keys():
            if item[0:13] != "user/-/label/":
                continue
            data = self.api.unreadCounts[item]
            cur = self.conn.cursor()
            cur.execute("""insert into categories(id,name,unread_count,timestamp,date) values(:id,:name,:count,:ts,:d)
                        on conflict(id) do update set unread_count = :count, timestamp = :ts, date = :d;
                        """,
                        {"id": item, "name": item[13:], "count": data[0], "ts": data[1], "d": data[2]})
        self.conn.commit()
        for item in self.api.feeds:
            data = self.api.unreadCounts[item["id"]]
            cur.execute("""insert into feeds(id,name,unread_count,timestamp,date,category_id) values(:id,:name,:count,:ts,:d,:c_id)
                        on conflict(id) do update set unread_count = :count, timestamp = :ts, date = :d,category_id = :c_id;
                        """,
                        {"id": item["id"], "name": item["title"], "count": data[0], "ts": data[1], "d": data[2],
                            "c_id": item["categories"][0]["id"]})
        self.conn.commit()
        cur.execute("""select id, name, unread_count from categories""")
        for row in cur.fetchall():
            yield "Fetching category " + row[1]
            articles = self.api.articlesFromCategory(row[0], str(row[2]))
            for article in articles:
                articleObj = Article(article)
                cur.execute("""insert into articles(id,title,timestamp,date,content,url,is_read,origin,category_id)
                            values(:id,:t,:ts,:d,:c,:u,:r,:o,:c_id) on conflict(id) do update
                            set id = :id, title = :t, timestamp = :ts, date = :d, content = :c, url = :u, is_read = :r, category_id = :c_id,
                            origin = :o;
                            """,
                            {"id": articleObj.id, "t": articleObj.title, "ts": articleObj.timestamp, "d": articleObj.date,
                             "c": articleObj.text, "u": articleObj.url, "r": articleObj.is_read, "o": articleObj.origin, "c_id": row[0]})
                for link in articleObj.links:
                    cur.execute("""insert into links(id,url) values(?,?)""", (articleObj.id, link))

            self.conn.commit()