use crate::data::entities::CardState;
use crate::data::repositories::{DataRepository, DataRepositoryInner, Query};
use crate::data::Id;
use crate::data_provider::{SqliteDbLayer, TableAccessQuerySet};
use chrono::NaiveDate;
use fsrs::MemoryState;
use rusqlite::{Error, Params, Row};
use std::sync::Arc;

pub type CardStateRepository = DataRepository<CardState, CardStateDbLayer>;
pub type CardStateRepositoryInner = DataRepositoryInner<CardState, CardStateDbLayer>;
pub type CardStateDbLayer = SqliteDbLayer<CardState, CardStatesQuerySet>;
#[derive(Clone)]
pub struct CardStatesQuerySet;
impl TableAccessQuerySet<CardState> for CardStatesQuerySet {
    fn load() -> &'static str {
        "SELECT id, word_id, deck_id, score, last_opened, fsrs_opened, fsrs_memory, fsrs_open_day FROM states"
    }

    fn save() -> &'static str {
        "UPDATE states SET score = ?1, last_opened = ?2, fsrs_opened = ?3, fsrs_memory = ?4, fsrs_open_day = ?5 WHERE id = ?6"
    }

    fn add() -> &'static str {
        "INSERT INTO states (word_id, deck_id, score, last_opened, fsrs_opened, fsrs_memory, fsrs_open_day) VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7)"
    }

    fn name() -> &'static str {
        "states"
    }

    fn from_sql(row: &Row) -> Result<CardState, Error> {
        Ok(CardState {
            id: row.get(0)?,
            word_id: row.get(1)?,
            deck_id: row.get(2)?,
            score: row.get(3)?,
            fsrs_opened: NaiveDate::from_epoch_days(row.get::<usize, i32>(5)?)
                .expect("Incorrect date encoding"),
            fsrs_memory: get_memory(row.get(6)?),
            last_open: row.get(4)?,
            fsrs_open_day: NaiveDate::from_epoch_days(row.get::<usize, i32>(7)?)
                .expect("Incorrect date encoding"),
        })
    }

    fn insert_params(entity: &CardState) -> impl Params {
        (
            entity.word_id,
            entity.deck_id,
            entity.score,
            entity.last_open.timestamp(),
            entity.fsrs_opened.to_epoch_days(),
            memory_to_i64(&entity.fsrs_memory),
            entity.fsrs_open_day.to_epoch_days(),
        )
    }

    fn update_params(entity: &CardState) -> impl Params {
        (
            entity.score,
            entity.last_open.timestamp(),
            entity.fsrs_opened.to_epoch_days(),
            memory_to_i64(&entity.fsrs_memory),
            entity.fsrs_open_day.to_epoch_days(),
            entity.id,
        )
    }
}

fn get_memory(value: i64) -> Option<MemoryState> {
    if value == 0 {
        return None;
    }
    Some(MemoryState {
        stability: f32::from_bits(value as u32),
        difficulty: f32::from_bits((value >> 32) as u32),
    })
}

fn memory_to_i64(value: &Option<MemoryState>) -> i64 {
    let Some(value) = &value else {
        return 0;
    };

    value.stability.to_bits() as i64 | ((value.difficulty.to_bits() as i64) << 32)
}

impl CardStateRepositoryInner {
    pub fn deck_states(
        &self,
        deck_id: Id,
    ) -> Query<CardState, CardStateRepositoryInner, CardStateDbLayer> {
        self.query(Arc::new(move |state| state.deck_id == deck_id))
    }
}