use crate::lang::{CardStatistics, DeckSettings};
use rusqlite::{Connection, params};
use std::time::Instant;

pub fn load_stats_of_deck(set: &DeckSettings, connection: &Connection) -> Vec<CardStatistics> {
    let mut stmt = connection
        .prepare("SELECT id, word_id, score, last_opened FROM card_stats WHERE set_id = ?1")
        .unwrap();
    let iter = stmt
        .query_map((set.id,), |row| {
            Ok(CardStatistics {
                id: row.get(0)?,
                word_id: row.get(1)?,
                set_id: set.id,
                score: row.get(2)?,
                last_open: row.get(3)?,
            })
        })
        .unwrap();

    let mut buffer = vec![];
    for word in iter {
        buffer.push(word.unwrap());
    }

    buffer
}

pub fn add_stat_list(stats: &mut [CardStatistics], connection: &mut Connection) {
    let time = Instant::now();
    let tx = connection.transaction().unwrap();
    let count = stats.len();

    {
        let mut stmt = tx
            .prepare(
                "INSERT INTO card_stats (word_id, set_id, score, last_opened) VALUES (?1, ?2, ?3, ?4)",
            )
            .unwrap();

        for stat in stats.iter() {
            stmt.execute(params![
                stat.word_id,
                stat.set_id,
                stat.score,
                stat.last_open.timestamp()
            ])
            .unwrap();
        }
    }

    let last_index: u32 = tx.last_insert_rowid() as u32;
    tx.commit().unwrap();

    let start_index = last_index - (count as u32) + 1;

    for (index, id) in (start_index..=last_index).enumerate() {
        stats[index].id = id.into();
    }

    println!("Added {} cards for {:?}", stats.len(), time.elapsed());
}

pub fn update_stat_score(stat: &CardStatistics, connection: &Connection) {
    let time = Instant::now();

    connection
        .execute(
            "UPDATE card_stats SET score = ?1, last_opened = ?2 WHERE id = ?3",
            (&stat.score, &stat.last_open.timestamp(), &stat.id),
        )
        .unwrap();
    println!("Updated stat: {}", time.elapsed().as_millis());
}

pub fn delete_stat(stat: &CardStatistics, connection: &Connection) {
    if !stat.id.is_valid() {
        return;
    }
    connection
        .execute("DELETE FROM card_stats WHERE id = ?1", (&stat.id,))
        .unwrap();
}