//! # Likes helper
//!
//! Module dedicated to likes management

use crate::data::error::ResultBoxError;
use crate::helpers::database::QueryInfo;
use crate::constants::database_tables_names::LIKES_TABLE;
use crate::data::user::UserID;

pub enum LikeType {
    USER,
    POST,
    COMMENT,
    GROUP
}

impl LikeType {

    /// Get matching database type
    pub fn to_db_type(&self) -> String {
        match self {
            LikeType::USER => "page".to_string(),
            LikeType::POST => "texte".to_string(),
            LikeType::COMMENT => "commentaire".to_string(),
            LikeType::GROUP => "group".to_string(),
        }
    }
}

/// Count the number of likes over an element
pub fn count(id: u64, kind: LikeType) -> ResultBoxError<usize> {
    QueryInfo::new(LIKES_TABLE)
        .cond_u64("ID_type", id)
        .cond("type", kind.to_db_type().as_ref())
        .exec_count()
}

/// Check if a user likes an element or not
pub fn is_liking(user_id: &UserID, id: u64, kind: LikeType) -> ResultBoxError<bool> {
    if !user_id.is_valid() {
        return Ok(false);
    }

    Ok(QueryInfo::new(LIKES_TABLE)
        .cond_u64("ID_type", id)
        .cond_user_id("ID_personne", user_id)
        .cond("type", kind.to_db_type().as_ref())
        .exec_count()? > 0)
}