use std::path::PathBuf;
use chrono::FixedOffset;
use rusqlite::{ Connection, Result};
use super::files::*;
use super::net::*;
use chrono::Utc; //Maybe use a different time?
use chrono::DateTime;

/*
Cache is the in-memory database
Any changes/updates are written to file database
*/

struct Item {
    title: String,
    content: Option<String>,
}

const DB_LOCATION: &str = "rsscar.db";

fn get_db_path() -> PathBuf {
    get_data_directory().join(DB_LOCATION)
}

fn get_db() -> Connection{
    Connection::open(get_db_path()).unwrap()
}
const FEEDS_TABLE_CREATE: &str = "CREATE TABLE IF NOT EXISTS 'feeds' (
	'feedID'	INTEGER NOT NULL,
	'title'	TEXT NOT NULL,
	'description'	TEXT,
	'icon'	BLOB,
    'url' text not null unique on conflict replace,
	'subscribed' INTEGER NOT NULL default 0,
	'last_updated'	TEXT ,
	PRIMARY KEY('feedID')
    );";

const FEEDS_INDEX_CREATE: &str = "CREATE INDEX IF NOT EXISTS  'subscribed_feeds_idx' ON 'feeds' (
	'feedID'	ASC
    ) WHERE 'subscribed' = 1;";

/*  */
const ITEMS_TABLE_CREATE: &str = "CREATE TABLE IF NOT EXISTS 'items' (
	'itemID'	INTEGER NOT NULL,
	'title'	TEXT NOT NULL,
	'icon'	BLOB,
    'url' text not null unique on conflict replace,
	'description'	TEXT,
	'content'	TEXT,
	'read'	INTEGER DEFAULT 0,
	PRIMARY KEY('itemID')
);";
const ITEMS_INDEX_CREATE: &str = "CREATE INDEX IF NOT EXISTS 'items_idx' on 'items'('itemID' ASC);";

const DB_RESET: &str = "
    drop table feeds;
    drop table items;
";

pub fn reset(){
    println!("⚠️WARNING⚠️\nResetting Database");
    let conn = get_db();
    match conn.execute_batch(DB_RESET) {
        Ok(_) => {println!("Database successfully wiped.")}
        Err(e) => {panic!("Error erasing database.\nError: {0}",e)} 
    }
    conn.close().unwrap();
    initialize();

}


pub fn initialize() {
    let path = get_db_path();
    println!("Database at {} initialized", path.as_os_str().display());
    let conn = get_db();
    conn.execute(FEEDS_TABLE_CREATE, []).unwrap();
    conn.execute(FEEDS_INDEX_CREATE, []).unwrap();
    conn.execute(ITEMS_TABLE_CREATE, []).unwrap();
    conn.execute(ITEMS_INDEX_CREATE, []).unwrap();
    conn.close().unwrap();
    println!("Database Initialized.")
}


pub fn add_feed(url: &str) {
    let conn = Connection::open(get_db_path()).unwrap();
    let feed = load_rss(url).unwrap();
    let new_feed = feed.clone();
    let time = Utc::now().to_rfc2822();
    conn.execute(
        "insert into feeds(title,url,description,last_updated) values(?1,?2,?3,?4)",
        [feed.title, url.to_owned(), feed.description, time],
    )
    .unwrap();
    conn.close().unwrap();
    //need to get the feed_id from the DB and then make sure items are mapped to feed
    store_items(new_feed);
}

pub fn store_items(feed: rss::Channel) {
    let conn = Connection::open(get_db_path()).unwrap();
    feed.items.iter().for_each(|i: &rss::Item| {
        conn.execute(
            "insert into items(url,title,description,content) values(?1,?2,?3,?4)",
            [
                i.link.clone(),
                i.title.clone(),
                i.description.clone(),
                i.content.clone(),
            ],
        )
        .unwrap();
    });
    conn.close().unwrap();
}

pub fn return_item() -> String {
    let conn = Connection::open(get_db_path()).unwrap();
    let item = conn
        .query_row(
            "select title,content from items where rowid=?1",
            [],
            |row| {
                Ok(Item {
                    title: row.get(0).unwrap(),
                    content: row.get(1).unwrap(),
                })
            },
        )
        .unwrap();
    match item.content {
        Some(content) => content,
        None => panic!(),
    }
}

pub struct FeedItem {
    pub item_id: usize,
    pub title: String,
    pub url: String,
    pub icon: Option<String>,
    pub description: Option<String>,
    pub content: Option<String>
    //date missing! needed for ordering!!!

}

pub fn get_feed_items(id: usize) -> Vec<FeedItem>{
    let conn = get_db();
    let mut stmt = conn.prepare("select itemID,title,url,icon,description,content from items").unwrap();
    let items:Result<Vec<FeedItem>> = stmt.query_map([], |row| {
        Ok(FeedItem{
            item_id: row.get(0).unwrap(),
            title: row.get(1).unwrap(),
            url: row.get(2).unwrap(),
            icon: row.get(3).unwrap(),
            description: row.get(4).unwrap(),
            content: row.get(5).unwrap()
        })
    }).unwrap().collect();
    match items {
        Ok(i) => {i},
        Err(_) => {panic!("No items for this feed\nFeedID:{}",id)}
    }
}

pub struct Feed {
    pub feed_id: usize,
    pub title: String,
    pub description: Option<String>,
    pub icon: Option<String>,
    pub url: String,
    pub subscribed: bool,
    pub last_updated: Option<DateTime<Utc>>,
}

fn time_string_conversion(str: String) -> Option<DateTime<Utc>>{
    match DateTime::parse_from_rfc2822(&str) {
        Ok(dt) => {Some(dt.to_utc())},
        Err(_) => {None}
        }
}

pub fn get_feeds() -> Vec<Feed> {
    let conn = get_db();
    let mut stmt = conn.prepare("select feedID,title,description,icon,url,subscribed,last_updated from feeds order by last_updated desc").unwrap();
    let rows: Result<Vec<Feed>> = stmt
        .query_map([], |row| {
            Ok(Feed {
                feed_id: row.get(0).unwrap(),
                title: row.get(1).unwrap(),
                description: row.get(2).unwrap(),
                icon: row.get(3).unwrap(),
                url: row.get(4).unwrap(),
                subscribed: row.get::<_,bool>(5).unwrap(),
                last_updated:time_string_conversion(row.get(6).unwrap()),
            })
        }).unwrap().collect();
    match rows {
        Ok(r) => {
            r
        }
        Err(e) => {panic!("No idea what causes this")}
    }
}
struct ReturnedFeedURLs {
    url: String,
}
pub fn update_feeds() {
    //get feeds
    let conn = Connection::open(get_db_path()).unwrap();
    let mut stmt = conn.prepare("select url from feeds").unwrap();
    let rows = stmt
        .query_map([], |row| {
            Ok(ReturnedFeedURLs {
                url: row.get(0).unwrap(),
            })
        })
        .unwrap();
    let mut urls: Vec<String> = Vec::new();
    for feed in rows {
        let url = feed.unwrap().url.clone();
        urls.push(url);
    }
    stmt.finalize().unwrap();
    conn.close().unwrap();

    for u in urls {
        store_items(load_rss(&u).unwrap());
    }

    //for each feed
    // insert items into database

    //close out
}