use sqlx::{postgres::PgQueryAs, Executor, Postgres};
use sqlx_test::{new, test_type};
use std::fmt::Debug;

// Transparent types are rust-side wrappers over DB types
#[derive(PartialEq, Debug, sqlx::Type)]
#[sqlx(transparent)]
struct Transparent(i32);

// "Weak" enums map to an integer type indicated by #[repr]
#[derive(PartialEq, Copy, Clone, Debug, sqlx::Type)]
#[repr(i32)]
enum Weak {
    One = 0,
    Two = 2,
    Three = 4,
}

// "Strong" enums can map to TEXT (25) or a custom enum type
#[derive(PartialEq, Debug, sqlx::Type)]
#[sqlx(rename = "text")]
#[sqlx(rename_all = "lowercase")]
enum Strong {
    One,
    Two,

    #[sqlx(rename = "four")]
    Three,
}

// Records must map to a custom type
// Note that all types are types in Postgres
#[derive(PartialEq, Debug, sqlx::Type)]
#[sqlx(rename = "inventory_item")]
struct InventoryItem {
    name: String,
    supplier_id: Option<i32>,
    price: Option<i64>,
}

test_type!(transparent(
    Postgres,
    Transparent,
    "0" == Transparent(0),
    "23523" == Transparent(23523)
));

test_type!(weak_enum(
    Postgres,
    Weak,
    "0::int4" == Weak::One,
    "2::int4" == Weak::Two,
    "4::int4" == Weak::Three
));

test_type!(strong_enum(
    Postgres,
    Strong,
    "'one'::text" == Strong::One,
    "'two'::text" == Strong::Two,
    "'four'::text" == Strong::Three
));

#[cfg_attr(feature = "runtime-async-std", async_std::test)]
#[cfg_attr(feature = "runtime-tokio", tokio::test)]
async fn test_record_type() -> anyhow::Result<()> {
    let mut conn = new::<Postgres>().await?;

    conn.execute(
        r#"
DO $$ BEGIN

CREATE TYPE inventory_item AS (
    name            text,
    supplier_id     int,
    price           bigint
);

EXCEPTION
    WHEN duplicate_object THEN null;
END $$;
    "#,
    )
    .await?;

    let value = InventoryItem {
        name: "fuzzy dice".to_owned(),
        supplier_id: Some(42),
        price: Some(199),
    };

    let rec: (bool, InventoryItem) = sqlx::query_as(
        "
        SELECT $1 = ROW('fuzzy dice', 42, 199)::inventory_item, $1
        ",
    )
    .bind(&value)
    .fetch_one(&mut conn)
    .await?;

    assert!(rec.0);
    assert_eq!(rec.1, value);

    Ok(())
}

#[cfg(feature = "macros")]
#[cfg_attr(feature = "runtime-async-std", async_std::test)]
#[cfg_attr(feature = "runtime-tokio", tokio::test)]
async fn test_from_row() -> anyhow::Result<()> {
    // Needed for PgQueryAs
    use sqlx::prelude::*;

    let mut conn = new::<Postgres>().await?;

    #[derive(sqlx::FromRow)]
    struct Account {
        id: i32,
        name: String,
    }

    let account: Account = sqlx::query_as(
        "SELECT * from (VALUES (1, 'Herp Derpinson')) accounts(id, name) where id = $1",
    )
    .bind(1_i32)
    .fetch_one(&mut conn)
    .await?;

    assert_eq!(account.id, 1);
    assert_eq!(account.name, "Herp Derpinson");

    // A _single_ lifetime may be used but only when using the lowest-level API currently (Query::fetch)

    #[derive(sqlx::FromRow)]
    struct RefAccount<'a> {
        id: i32,
        name: &'a str,
    }

    let mut cursor = sqlx::query(
        "SELECT * from (VALUES (1, 'Herp Derpinson')) accounts(id, name) where id = $1",
    )
    .bind(1_i32)
    .fetch(&mut conn);

    let account = RefAccount::from_row(&cursor.next().await?.unwrap())?;

    assert_eq!(account.id, 1);
    assert_eq!(account.name, "Herp Derpinson");

    Ok(())
}

#[cfg(feature = "macros")]
#[cfg_attr(feature = "runtime-async-std", async_std::test)]
#[cfg_attr(feature = "runtime-tokio", tokio::test)]
async fn test_from_row_with_keyword() -> anyhow::Result<()> {
    use sqlx::prelude::*;

    #[derive(Debug, sqlx::FromRow)]
    struct AccountKeyword {
        r#type: i32,
        r#static: String,
        r#let: Option<String>,
        r#struct: Option<String>,
        name: Option<String>,
    }

    let mut conn = new::<Postgres>().await?;

    let account: AccountKeyword = sqlx::query_as(
        r#"SELECT * from (VALUES (1, 'foo', 'bar', null, null)) accounts(type, static, let, struct, name)"#
    )
    .fetch_one(&mut conn)
    .await?;
    println!("{:?}", account);

    assert_eq!(1, account.r#type);
    assert_eq!("foo", account.r#static);
    assert_eq!(None, account.r#struct);
    assert_eq!(Some("bar".to_owned()), account.r#let);
    assert_eq!(None, account.name);

    Ok(())
}

#[cfg(feature = "macros")]
#[cfg_attr(feature = "runtime-async-std", async_std::test)]
#[cfg_attr(feature = "runtime-tokio", tokio::test)]
async fn test_from_row_with_rename() -> anyhow::Result<()> {
    use sqlx::prelude::*;

    #[derive(Debug, sqlx::FromRow)]
    struct AccountKeyword {
        #[sqlx(rename = "type")]
        own_type: i32,

        #[sqlx(rename = "static")]
        my_static: String,

        #[sqlx(rename = "let")]
        custom_let: Option<String>,

        #[sqlx(rename = "struct")]
        def_struct: Option<String>,

        name: Option<String>,
    }

    let mut conn = new::<Postgres>().await?;

    let account: AccountKeyword = sqlx::query_as(
        r#"SELECT * from (VALUES (1, 'foo', 'bar', null, null)) accounts(type, static, let, struct, name)"#
    )
    .fetch_one(&mut conn)
    .await?;
    println!("{:?}", account);

    assert_eq!(1, account.own_type);
    assert_eq!("foo", account.my_static);
    assert_eq!(None, account.def_struct);
    assert_eq!(Some("bar".to_owned()), account.custom_let);
    assert_eq!(None, account.name);

    Ok(())
}