use std::io::{Read, Write};
use std::thread;
use std::time::Duration;
use tokio_postgres::error::SqlState;
use tokio_postgres::types::Type;
use tokio_postgres::NoTls;

use super::*;
use crate::binary_copy::{BinaryCopyInWriter, BinaryCopyOutIter};
use fallible_iterator::FallibleIterator;

#[test]
fn prepare() {
    let mut client = Client::connect("host=localhost port=5433 user=postgres", NoTls).unwrap();

    let stmt = client.prepare("SELECT 1::INT, $1::TEXT").unwrap();
    assert_eq!(stmt.params(), &[Type::TEXT]);
    assert_eq!(stmt.columns().len(), 2);
    assert_eq!(stmt.columns()[0].type_(), &Type::INT4);
    assert_eq!(stmt.columns()[1].type_(), &Type::TEXT);
}

#[test]
fn query_prepared() {
    let mut client = Client::connect("host=localhost port=5433 user=postgres", NoTls).unwrap();

    let stmt = client.prepare("SELECT $1::TEXT").unwrap();
    let rows = client.query(&stmt, &[&"hello"]).unwrap();
    assert_eq!(rows.len(), 1);
    assert_eq!(rows[0].get::<_, &str>(0), "hello");
}

#[test]
fn query_unprepared() {
    let mut client = Client::connect("host=localhost port=5433 user=postgres", NoTls).unwrap();

    let rows = client.query("SELECT $1::TEXT", &[&"hello"]).unwrap();
    assert_eq!(rows.len(), 1);
    assert_eq!(rows[0].get::<_, &str>(0), "hello");
}

#[test]
fn transaction_commit() {
    let mut client = Client::connect("host=localhost port=5433 user=postgres", NoTls).unwrap();

    client
        .simple_query("CREATE TEMPORARY TABLE foo (id SERIAL PRIMARY KEY)")
        .unwrap();

    let mut transaction = client.transaction().unwrap();

    transaction
        .execute("INSERT INTO foo DEFAULT VALUES", &[])
        .unwrap();

    transaction.commit().unwrap();

    let rows = client.query("SELECT * FROM foo", &[]).unwrap();
    assert_eq!(rows.len(), 1);
    assert_eq!(rows[0].get::<_, i32>(0), 1);
}

#[test]
fn transaction_rollback() {
    let mut client = Client::connect("host=localhost port=5433 user=postgres", NoTls).unwrap();

    client
        .simple_query("CREATE TEMPORARY TABLE foo (id SERIAL PRIMARY KEY)")
        .unwrap();

    let mut transaction = client.transaction().unwrap();

    transaction
        .execute("INSERT INTO foo DEFAULT VALUES", &[])
        .unwrap();

    transaction.rollback().unwrap();

    let rows = client.query("SELECT * FROM foo", &[]).unwrap();
    assert_eq!(rows.len(), 0);
}

#[test]
fn transaction_drop() {
    let mut client = Client::connect("host=localhost port=5433 user=postgres", NoTls).unwrap();

    client
        .simple_query("CREATE TEMPORARY TABLE foo (id SERIAL PRIMARY KEY)")
        .unwrap();

    let mut transaction = client.transaction().unwrap();

    transaction
        .execute("INSERT INTO foo DEFAULT VALUES", &[])
        .unwrap();

    drop(transaction);

    let rows = client.query("SELECT * FROM foo", &[]).unwrap();
    assert_eq!(rows.len(), 0);
}

#[test]
fn nested_transactions() {
    let mut client = Client::connect("host=localhost port=5433 user=postgres", NoTls).unwrap();

    client
        .batch_execute("CREATE TEMPORARY TABLE foo (id INT PRIMARY KEY)")
        .unwrap();

    let mut transaction = client.transaction().unwrap();

    transaction
        .execute("INSERT INTO foo (id) VALUES (1)", &[])
        .unwrap();

    let mut transaction2 = transaction.transaction().unwrap();

    transaction2
        .execute("INSERT INTO foo (id) VALUES (2)", &[])
        .unwrap();

    transaction2.rollback().unwrap();

    let rows = transaction
        .query("SELECT id FROM foo ORDER BY id", &[])
        .unwrap();
    assert_eq!(rows.len(), 1);
    assert_eq!(rows[0].get::<_, i32>(0), 1);

    let mut transaction3 = transaction.transaction().unwrap();

    transaction3
        .execute("INSERT INTO foo (id) VALUES(3)", &[])
        .unwrap();

    let mut transaction4 = transaction3.transaction().unwrap();

    transaction4
        .execute("INSERT INTO foo (id) VALUES(4)", &[])
        .unwrap();

    transaction4.commit().unwrap();
    transaction3.commit().unwrap();
    transaction.commit().unwrap();

    let rows = client.query("SELECT id FROM foo ORDER BY id", &[]).unwrap();
    assert_eq!(rows.len(), 3);
    assert_eq!(rows[0].get::<_, i32>(0), 1);
    assert_eq!(rows[1].get::<_, i32>(0), 3);
    assert_eq!(rows[2].get::<_, i32>(0), 4);
}

#[test]
fn copy_in() {
    let mut client = Client::connect("host=localhost port=5433 user=postgres", NoTls).unwrap();

    client
        .simple_query("CREATE TEMPORARY TABLE foo (id INT, name TEXT)")
        .unwrap();

    let mut writer = client.copy_in("COPY foo FROM stdin").unwrap();
    writer.write_all(b"1\tsteven\n2\ttimothy").unwrap();
    writer.finish().unwrap();

    let rows = client
        .query("SELECT id, name FROM foo ORDER BY id", &[])
        .unwrap();

    assert_eq!(rows.len(), 2);
    assert_eq!(rows[0].get::<_, i32>(0), 1);
    assert_eq!(rows[0].get::<_, &str>(1), "steven");
    assert_eq!(rows[1].get::<_, i32>(0), 2);
    assert_eq!(rows[1].get::<_, &str>(1), "timothy");
}

#[test]
fn copy_in_abort() {
    let mut client = Client::connect("host=localhost port=5433 user=postgres", NoTls).unwrap();

    client
        .simple_query("CREATE TEMPORARY TABLE foo (id INT, name TEXT)")
        .unwrap();

    let mut writer = client.copy_in("COPY foo FROM stdin").unwrap();
    writer.write_all(b"1\tsteven\n2\ttimothy").unwrap();
    drop(writer);

    let rows = client
        .query("SELECT id, name FROM foo ORDER BY id", &[])
        .unwrap();

    assert_eq!(rows.len(), 0);
}

#[test]
fn binary_copy_in() {
    let mut client = Client::connect("host=localhost port=5433 user=postgres", NoTls).unwrap();

    client
        .simple_query("CREATE TEMPORARY TABLE foo (id INT, name TEXT)")
        .unwrap();

    let writer = client.copy_in("COPY foo FROM stdin BINARY").unwrap();
    let mut writer = BinaryCopyInWriter::new(writer, &[Type::INT4, Type::TEXT]);
    writer.write(&[&1i32, &"steven"]).unwrap();
    writer.write(&[&2i32, &"timothy"]).unwrap();
    writer.finish().unwrap();

    let rows = client
        .query("SELECT id, name FROM foo ORDER BY id", &[])
        .unwrap();

    assert_eq!(rows.len(), 2);
    assert_eq!(rows[0].get::<_, i32>(0), 1);
    assert_eq!(rows[0].get::<_, &str>(1), "steven");
    assert_eq!(rows[1].get::<_, i32>(0), 2);
    assert_eq!(rows[1].get::<_, &str>(1), "timothy");
}

#[test]
fn copy_out() {
    let mut client = Client::connect("host=localhost port=5433 user=postgres", NoTls).unwrap();

    client
        .simple_query(
            "CREATE TEMPORARY TABLE foo (id INT, name TEXT);
             INSERT INTO foo (id, name) VALUES (1, 'steven'), (2, 'timothy');",
        )
        .unwrap();

    let mut reader = client.copy_out("COPY foo (id, name) TO STDOUT").unwrap();
    let mut s = String::new();
    reader.read_to_string(&mut s).unwrap();
    drop(reader);

    assert_eq!(s, "1\tsteven\n2\ttimothy\n");

    client.simple_query("SELECT 1").unwrap();
}

#[test]
fn binary_copy_out() {
    let mut client = Client::connect("host=localhost port=5433 user=postgres", NoTls).unwrap();

    client
        .simple_query(
            "CREATE TEMPORARY TABLE foo (id INT, name TEXT);
             INSERT INTO foo (id, name) VALUES (1, 'steven'), (2, 'timothy');",
        )
        .unwrap();

    let reader = client
        .copy_out("COPY foo (id, name) TO STDOUT BINARY")
        .unwrap();
    let rows = BinaryCopyOutIter::new(reader, &[Type::INT4, Type::TEXT])
        .collect::<Vec<_>>()
        .unwrap();
    assert_eq!(rows.len(), 2);
    assert_eq!(rows[0].get::<i32>(0), 1);
    assert_eq!(rows[0].get::<&str>(1), "steven");
    assert_eq!(rows[1].get::<i32>(0), 2);
    assert_eq!(rows[1].get::<&str>(1), "timothy");

    client.simple_query("SELECT 1").unwrap();
}

#[test]
fn portal() {
    let mut client = Client::connect("host=localhost port=5433 user=postgres", NoTls).unwrap();

    client
        .simple_query(
            "CREATE TEMPORARY TABLE foo (id INT);
             INSERT INTO foo (id) VALUES (1), (2), (3);",
        )
        .unwrap();

    let mut transaction = client.transaction().unwrap();

    let portal = transaction
        .bind("SELECT * FROM foo ORDER BY id", &[])
        .unwrap();

    let rows = transaction.query_portal(&portal, 2).unwrap();
    assert_eq!(rows.len(), 2);
    assert_eq!(rows[0].get::<_, i32>(0), 1);
    assert_eq!(rows[1].get::<_, i32>(0), 2);

    let rows = transaction.query_portal(&portal, 2).unwrap();
    assert_eq!(rows.len(), 1);
    assert_eq!(rows[0].get::<_, i32>(0), 3);
}

#[test]
fn cancel_query() {
    let mut client = Client::connect("host=localhost port=5433 user=postgres", NoTls).unwrap();

    let cancel_token = client.cancel_token();
    let cancel_thread = thread::spawn(move || {
        thread::sleep(Duration::from_millis(100));
        cancel_token.cancel_query(NoTls).unwrap();
    });

    match client.batch_execute("SELECT pg_sleep(100)") {
        Err(e) if e.code() == Some(&SqlState::QUERY_CANCELED) => {}
        t => panic!("unexpected return: {:?}", t),
    }

    cancel_thread.join().unwrap();
}