//! # Forez Presence helper
//!
//! @author Pierre Hubert

use crate::constants::database_tables_names::FOREZ_PRESENCE_TABLE;
use crate::data::error::Res;
use crate::data::group_id::GroupID;
use crate::data::presence::Presence;
use crate::data::user::UserID;
use crate::helpers::database;

/// Get the list of presence contained in the database
pub fn get_list(group_id: &GroupID) -> Res<Vec<Presence>> {
    database::QueryInfo::new(FOREZ_PRESENCE_TABLE)
        .cond_group_id("group_id", group_id)
        .exec(db_to_presence)
}

/// Get the list of presences of a specific user
pub fn get_user_presences(group_id: &GroupID, user_id: &UserID) -> Res<Vec<Presence>> {
    database::QueryInfo::new(FOREZ_PRESENCE_TABLE)
        .cond_user_id("user_id", user_id)
        .cond_group_id("group_id", group_id)
        .exec(db_to_presence)
}

/// Update the presences of a user
pub fn update(group_id: &GroupID, user_id: &UserID, list: Vec<Presence>) -> Res {
    let previous_presences = get_user_presences(group_id, user_id)?;
    for presence in &list {
        if !previous_presences.contains(presence) {
            database::InsertQuery::new(FOREZ_PRESENCE_TABLE)
                .add_user_id("user_id", user_id)
                .add_group_id("group_id", group_id)
                .add_u32("year", presence.year)
                .add_u16("month", presence.month)
                .add_u16("day", presence.day)
                .insert()?;
        }
    }

    for prev in &previous_presences {
        if !list.contains(prev) {
            database::DeleteQuery::new(FOREZ_PRESENCE_TABLE)
                .cond_u64("id", prev.id)
                .exec()?;
        }
    }

    Ok(())
}

/// Turn a database entry into a presence entry
fn db_to_presence(row: &database::RowResult) -> Res<Presence> {
    Ok(Presence {
        id: row.get_u64("id")?,
        user_id: row.get_user_id("user_id")?,
        year: row.get_u32("year")?,
        month: row.get_u16("month")?,
        day: row.get_u16("day")?,
    })
}