// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
use rusty_v8 as v8;

use serde::Deserialize;

use serde_v8::utils::{js_exec, v8_do};

#[derive(Debug, Deserialize, PartialEq)]
struct MathOp {
  pub a: u64,
  pub b: u64,
  pub operator: Option<String>,
}

fn dedo(
  code: &str,
  f: impl FnOnce(&mut v8::HandleScope, v8::Local<v8::Value>),
) {
  v8_do(|| {
    let isolate = &mut v8::Isolate::new(v8::CreateParams::default());
    let handle_scope = &mut v8::HandleScope::new(isolate);
    let context = v8::Context::new(handle_scope);
    let scope = &mut v8::ContextScope::new(handle_scope, context);
    let v = js_exec(scope, code);

    f(scope, v);
  })
}

macro_rules! detest {
  ($fn_name:ident, $t:ty, $src:expr, $rust:expr) => {
    #[test]
    fn $fn_name() {
      dedo($src, |scope, v| {
        let rt = serde_v8::from_v8(scope, v);
        assert!(rt.is_ok(), format!("from_v8(\"{}\"): {:?}", $src, rt.err()));
        let t: $t = rt.unwrap();
        assert_eq!(t, $rust);
      });
    }
  };
}

detest!(de_option_some, Option<bool>, "true", Some(true));
detest!(de_option_null, Option<bool>, "null", None);
detest!(de_option_undefined, Option<bool>, "undefined", None);
detest!(de_unit_null, (), "null", ());
detest!(de_unit_undefined, (), "undefined", ());
detest!(de_bool, bool, "true", true);
detest!(de_u64, u64, "32", 32);
detest!(de_string, String, "'Hello'", "Hello".to_owned());
detest!(de_vec_u64, Vec<u64>, "[1,2,3,4,5]", vec![1, 2, 3, 4, 5]);
detest!(
  de_vec_str,
  Vec<String>,
  "['hello', 'world']",
  vec!["hello".to_owned(), "world".to_owned()]
);
detest!(
  de_tuple,
  (u64, bool, ()),
  "[123, true, null]",
  (123, true, ())
);
detest!(
  de_mathop,
  MathOp,
  "({a: 1, b: 3, c: 'ignored'})",
  MathOp {
    a: 1,
    b: 3,
    operator: None
  }
);

#[test]
fn de_f64() {
  dedo("12345.0", |scope, v| {
    let x: f64 = serde_v8::from_v8(scope, v).unwrap();
    assert!((x - 12345.0).abs() < f64::EPSILON);
  });
}

#[test]
fn de_map() {
  use std::collections::HashMap;

  dedo("({a: 1, b: 2, c: 3})", |scope, v| {
    let map: HashMap<String, u64> = serde_v8::from_v8(scope, v).unwrap();
    assert_eq!(map.get("a").cloned(), Some(1));
    assert_eq!(map.get("b").cloned(), Some(2));
    assert_eq!(map.get("c").cloned(), Some(3));
    assert_eq!(map.get("nada"), None);
  })
}

////
// JSON tests: serde_json::Value compatibility
////

detest!(
  de_json_null,
  serde_json::Value,
  "null",
  serde_json::Value::Null
);
detest!(
  de_json_bool,
  serde_json::Value,
  "true",
  serde_json::Value::Bool(true)
);
detest!(
  de_json_int,
  serde_json::Value,
  "123",
  serde_json::Value::Number(serde_json::Number::from_f64(123.0).unwrap())
);
detest!(
  de_json_float,
  serde_json::Value,
  "123.45",
  serde_json::Value::Number(serde_json::Number::from_f64(123.45).unwrap())
);
detest!(
  de_json_string,
  serde_json::Value,
  "'Hello'",
  serde_json::Value::String("Hello".to_string())
);
detest!(
  de_json_vec_string,
  serde_json::Value,
  "['Hello', 'World']",
  serde_json::Value::Array(vec![
    serde_json::Value::String("Hello".to_string()),
    serde_json::Value::String("World".to_string())
  ])
);
detest!(
  de_json_tuple,
  serde_json::Value,
  "[true, 'World', 123.45, null]",
  serde_json::Value::Array(vec![
    serde_json::Value::Bool(true),
    serde_json::Value::String("World".to_string()),
    serde_json::Value::Number(serde_json::Number::from_f64(123.45).unwrap()),
    serde_json::Value::Null,
  ])
);
detest!(
  de_json_object,
  serde_json::Value,
  "({a: 1, b: 'hello', c: true})",
  serde_json::Value::Object(
    vec![
      (
        "a".to_string(),
        serde_json::Value::Number(serde_json::Number::from_f64(1.0).unwrap()),
      ),
      (
        "b".to_string(),
        serde_json::Value::String("hello".to_string()),
      ),
      ("c".to_string(), serde_json::Value::Bool(true),),
    ]
    .drain(..)
    .collect()
  )
);