use std::collections::HashMap;
use std::f32;
use std::f64;
use std::fmt;

use postgres::{Connection, SslMode, Slice, Error};
use postgres::types::{ToSql, FromSql};

#[cfg(feature = "uuid")]
mod uuid;
#[cfg(feature = "time")]
mod time;
#[cfg(feature = "rustc-serialize")]
mod rustc_serialize;
#[cfg(feature = "serde")]
mod serde;

fn test_type<T: PartialEq+FromSql+ToSql, S: fmt::Display>(sql_type: &str, checks: &[(T, S)]) {
    let conn = or_panic!(Connection::connect("postgres://postgres@localhost", &SslMode::None));
    for &(ref val, ref repr) in checks.iter() {
        let stmt = or_panic!(conn.prepare(&*format!("SELECT {}::{}", *repr, sql_type)));
        let result = or_panic!(stmt.query(&[])).iter().next().unwrap().get(0);
        assert!(val == &result);

        let stmt = or_panic!(conn.prepare(&*format!("SELECT $1::{}", sql_type)));
        let result = or_panic!(stmt.query(&[val])).iter().next().unwrap().get(0);
        assert!(val == &result);
    }
}

#[test]
fn test_bool_params() {
    test_type("BOOL", &[(Some(true), "'t'"), (Some(false), "'f'"),
                       (None, "NULL")]);
}

#[test]
fn test_i8_params() {
    test_type("\"char\"", &[(Some('a' as i8), "'a'"), (None, "NULL")]);
}

#[test]
fn test_name_params() {
    test_type("NAME", &[(Some("hello world".to_string()), "'hello world'"),
                       (Some("イロハニホヘト チリヌルヲ".to_string()), "'イロハニホヘト チリヌルヲ'"),
                       (None, "NULL")]);
}

#[test]
fn test_i16_params() {
    test_type("SMALLINT", &[(Some(15001i16), "15001"),
                           (Some(-15001i16), "-15001"), (None, "NULL")]);
}

#[test]
fn test_i32_params() {
    test_type("INT", &[(Some(2147483548i32), "2147483548"),
                      (Some(-2147483548i32), "-2147483548"), (None, "NULL")]);
}

#[test]
fn test_oid_params() {
    test_type("OID", &[(Some(2147483548u32), "2147483548"),
                       (Some(4000000000), "4000000000"), (None, "NULL")]);
}

#[test]
fn test_i64_params() {
    test_type("BIGINT", &[(Some(9223372036854775708i64), "9223372036854775708"),
                         (Some(-9223372036854775708i64), "-9223372036854775708"),
                         (None, "NULL")]);
}

#[test]
fn test_f32_params() {
    test_type("REAL", &[(Some(f32::INFINITY), "'infinity'"),
                       (Some(f32::NEG_INFINITY), "'-infinity'"),
                       (Some(1000.55), "1000.55"), (None, "NULL")]);
}

#[test]
fn test_f64_params() {
    test_type("DOUBLE PRECISION", &[(Some(f64::INFINITY), "'infinity'"),
                                   (Some(f64::NEG_INFINITY), "'-infinity'"),
                                   (Some(10000.55), "10000.55"),
                                   (None, "NULL")]);
}

#[test]
fn test_varchar_params() {
    test_type("VARCHAR", &[(Some("hello world".to_string()), "'hello world'"),
                          (Some("イロハニホヘト チリヌルヲ".to_string()), "'イロハニホヘト チリヌルヲ'"),
                          (None, "NULL")]);
}

#[test]
fn test_text_params() {
    test_type("TEXT", &[(Some("hello world".to_string()), "'hello world'"),
                       (Some("イロハニホヘト チリヌルヲ".to_string()), "'イロハニホヘト チリヌルヲ'"),
                       (None, "NULL")]);
}

#[test]
fn test_bpchar_params() {
    let conn = or_panic!(Connection::connect("postgres://postgres@localhost", &SslMode::None));
    or_panic!(conn.execute("CREATE TEMPORARY TABLE foo (
                            id SERIAL PRIMARY KEY,
                            b CHAR(5)
                           )", &[]));
    or_panic!(conn.execute("INSERT INTO foo (b) VALUES ($1), ($2), ($3)",
                           &[&Some("12345"), &Some("123"), &None::<&'static str>]));
    let stmt = or_panic!(conn.prepare("SELECT b FROM foo ORDER BY id"));
    let res = or_panic!(stmt.query(&[]));

    assert_eq!(vec!(Some("12345".to_string()), Some("123  ".to_string()), None),
               res.iter().map(|row| row.get(0)).collect::<Vec<_>>());
}

#[test]
fn test_citext_params() {
    let conn = or_panic!(Connection::connect("postgres://postgres@localhost", &SslMode::None));
    or_panic!(conn.execute("CREATE TEMPORARY TABLE foo (
                            id SERIAL PRIMARY KEY,
                            b CITEXT
                           )", &[]));
    or_panic!(conn.execute("INSERT INTO foo (b) VALUES ($1), ($2), ($3)",
                           &[&Some("foobar"), &Some("FooBar"), &None::<&'static str>]));
    let stmt = or_panic!(conn.prepare("SELECT id FROM foo WHERE b = 'FOOBAR' ORDER BY id"));
    let res = or_panic!(stmt.query(&[]));

    assert_eq!(vec!(Some(1i32), Some(2i32)), res.iter().map(|row| row.get(0)).collect::<Vec<_>>());
}

#[test]
fn test_bytea_params() {
    test_type("BYTEA", &[(Some(vec!(0u8, 1, 2, 3, 254, 255)), "'\\x00010203feff'"),
                        (None, "NULL")]);
}

#[test]
fn test_hstore_params() {
    macro_rules! make_map {
        ($($k:expr => $v:expr),+) => ({
            let mut map = HashMap::new();
            $(map.insert($k, $v);)+
            map
        })
    }
    test_type("hstore",
              &[(Some(make_map!("a".to_string() => Some("1".to_string()))), "'a=>1'"),
               (Some(make_map!("hello".to_string() => Some("world!".to_string()),
                               "hola".to_string() => Some("mundo!".to_string()),
                               "what".to_string() => None)),
                "'hello=>world!,hola=>mundo!,what=>NULL'"),
                (None, "NULL")]);
}

fn test_nan_param<T: PartialEq+ToSql+FromSql>(sql_type: &str) {
    let conn = or_panic!(Connection::connect("postgres://postgres@localhost", &SslMode::None));
    let stmt = or_panic!(conn.prepare(&*format!("SELECT 'NaN'::{}", sql_type)));
    let result = or_panic!(stmt.query(&[]));
    let val: T = result.iter().next().unwrap().get(0);
    assert!(val != val);
}

#[test]
fn test_f32_nan_param() {
    test_nan_param::<f32>("REAL");
}

#[test]
fn test_f64_nan_param() {
    test_nan_param::<f64>("DOUBLE PRECISION");
}

#[test]
fn test_pg_database_datname() {
    let conn = or_panic!(Connection::connect("postgres://postgres@localhost", &SslMode::None));
    let stmt = or_panic!(conn.prepare("SELECT datname FROM pg_database"));
    let result = or_panic!(stmt.query(&[]));

    let next = result.iter().next().unwrap();
    or_panic!(next.get_opt::<usize, String>(0));
    or_panic!(next.get_opt::<&str, String>("datname"));
}

#[test]
fn test_slice() {
    let conn = Connection::connect("postgres://postgres@localhost", &SslMode::None).unwrap();
    conn.batch_execute("CREATE TEMPORARY TABLE foo (id SERIAL PRIMARY KEY, f VARCHAR);
                        INSERT INTO foo (f) VALUES ('a'), ('b'), ('c'), ('d');").unwrap();

    let stmt = conn.prepare("SELECT f FROM foo WHERE id = ANY($1)").unwrap();
    let result = stmt.query(&[&Slice(&[1i32, 3, 4])]).unwrap();
    assert_eq!(vec!["a".to_string(), "c".to_string(), "d".to_string()],
               result.iter().map(|r| r.get::<_, String>(0)).collect::<Vec<_>>());
}

#[test]
fn test_slice_wrong_type() {
    let conn = Connection::connect("postgres://postgres@localhost", &SslMode::None).unwrap();
    conn.batch_execute("CREATE TEMPORARY TABLE foo (id SERIAL PRIMARY KEY)").unwrap();

    let stmt = conn.prepare("SELECT * FROM foo WHERE id = ANY($1)").unwrap();
    match stmt.query(&[&Slice(&["hi"])]) {
        Ok(_) => panic!("Unexpected success"),
        Err(Error::WrongType(..)) => {}
        Err(e) => panic!("Unexpected error {:?}", e),
    }
}

#[test]
fn test_slice_range() {
    let conn = Connection::connect("postgres://postgres@localhost", &SslMode::None).unwrap();

    let stmt = conn.prepare("SELECT $1::INT8RANGE").unwrap();
    match stmt.query(&[&Slice(&[1i64])]) {
        Ok(_) => panic!("Unexpected success"),
        Err(Error::WrongType(..)) => {}
        Err(e) => panic!("Unexpected error {:?}", e),
    }
}