use crate::{
    DbErr, EntityTrait, Linked, QueryFilter, QueryResult, Related, Select, SelectModel,
    SelectorRaw, Statement,
};
pub use sea_query::Value;
use std::fmt::Debug;

pub trait ModelTrait: Clone + Send + Debug {
    type Entity: EntityTrait;

    fn get(&self, c: <Self::Entity as EntityTrait>::Column) -> Value;

    fn set(&mut self, c: <Self::Entity as EntityTrait>::Column, v: Value);

    fn find_related<R>(&self, _: R) -> Select<R>
    where
        R: EntityTrait,
        Self::Entity: Related<R>,
    {
        <Self::Entity as Related<R>>::find_related().belongs_to(self)
    }

    fn find_linked<L>(&self, l: L) -> Select<L::ToEntity>
    where
        L: Linked<FromEntity = Self::Entity>,
    {
        let tbl_alias = &format!("r{}", l.link().len() - 1);
        l.find_linked().belongs_to_tbl_alias(self, tbl_alias)
    }
}

pub trait FromQueryResult: Sized {
    fn from_query_result(res: &QueryResult, pre: &str) -> Result<Self, DbErr>;

    fn from_query_result_optional(res: &QueryResult, pre: &str) -> Result<Option<Self>, DbErr> {
        Ok(Self::from_query_result(res, pre).ok())
    }

    /// ```
    /// # #[cfg(feature = "mock")]
    /// # use sea_orm::{error::*, tests_cfg::*, MockDatabase, Transaction, DbBackend};
    /// #
    /// # let db = MockDatabase::new(DbBackend::Postgres)
    /// #     .append_query_results(vec![vec![
    /// #         maplit::btreemap! {
    /// #             "name" => Into::<Value>::into("Chocolate Forest"),
    /// #             "num_of_cakes" => Into::<Value>::into(2),
    /// #         },
    /// #     ]])
    /// #     .into_connection();
    /// #
    /// use sea_orm::{query::*, FromQueryResult};
    ///
    /// #[derive(Debug, PartialEq, FromQueryResult)]
    /// struct SelectResult {
    ///     name: String,
    ///     num_of_cakes: i32,
    /// }
    ///
    /// # let _: Result<(), DbErr> = smol::block_on(async {
    /// #
    /// let res: Vec<SelectResult> = SelectResult::find_by_statement(Statement::from_sql_and_values(
    ///     DbBackend::Postgres,
    ///     r#"SELECT "name", COUNT(*) AS "num_of_cakes" FROM "cake" GROUP BY("name")"#,
    ///     vec![],
    /// ))
    /// .all(&db)
    /// .await?;
    ///
    /// assert_eq!(
    ///     res,
    ///     vec![SelectResult {
    ///         name: "Chocolate Forest".to_owned(),
    ///         num_of_cakes: 2,
    ///     },]
    /// );
    /// #
    /// # Ok(())
    /// # });
    /// # assert_eq!(
    /// #     db.into_transaction_log(),
    /// #     vec![Transaction::from_sql_and_values(
    /// #         DbBackend::Postgres,
    /// #         r#"SELECT "name", COUNT(*) AS "num_of_cakes" FROM "cake" GROUP BY("name")"#,
    /// #         vec![]
    /// #     ),]
    /// # );
    /// ```
    fn find_by_statement(stmt: Statement) -> SelectorRaw<SelectModel<Self>> {
        SelectorRaw::<SelectModel<Self>>::from_statement(stmt)
    }
}