// Copyright 2020-2021 IOTA Stiftung
// SPDX-License-Identifier: Apache-2.0

// #![cfg(feature = "derive")]

// use identity_diff::Diff;
// use serde::Deserialize;
// use serde::Serialize;

// #[derive(Diff, Debug, Clone, PartialEq, Default)]
// pub struct Test {
//     a: u32,
// }

// #[derive(Diff, Debug, Clone, PartialEq, Default)]
// pub struct SomeGeneric<T: Copy>(T);

// #[derive(Diff, Debug, Clone, PartialEq, Default)]
// pub struct TestTuple(String);

// #[derive(Diff, Debug, Clone, PartialEq, Default)]
// pub struct TestMixture(Test);

// #[derive(Diff, Debug, Clone, PartialEq, Default)]
// pub struct TestNest {
//     a: Test,
// }

// #[derive(Diff, Debug, Clone, PartialEq, Default)]
// pub struct BigTuple(usize, Vec<usize>, bool, String);

// #[derive(Diff, Debug, Clone, PartialEq, Default)]
// pub struct BigStruct {
//     a: Vec<usize>,
//     b: bool,
//     c: String,
//     d: usize,
// }

// #[derive(Diff, Debug, Clone, PartialEq, Default)]
// struct TestUnit;

// #[derive(Diff, Debug, Clone, PartialEq)]
// struct TestIgnore {
//     a: usize,
//     #[diff(should_ignore)]
//     b: usize,
// }

// #[derive(Diff, Debug, Clone, PartialEq, Default, Deserialize, Serialize)]
// struct JsonStruct {
//     a: usize,
//     b: String,
//     #[diff(should_ignore)]
//     c: Option<i32>,
//     d: Vec<u32>,
// }

// #[derive(Diff, Debug, Clone, PartialEq, Default, Deserialize, Serialize)]
// struct TestOpt {
//     a: Option<u32>,
//     b: OptTest,
// }

// #[derive(Diff, Debug, Clone, PartialEq, Default, Deserialize, Serialize)]
// struct OptTest(Option<u32>);

// #[derive(Diff, Debug, Clone, PartialEq, Default, Deserialize, Serialize)]
// #[diff(from_into)]
// struct FromInto {
//     #[serde(rename = "test", default, skip_serializing_if = "Option::is_none")]
//     a: Option<String>,
//     #[serde(rename = "type")]
//     b: Vec<String>,
// }

// #[test]
// fn test_traditional_struct() {
//     let t = Test { a: 10 };
//     let t2 = Test { a: 10 };

//     let diff = t.diff(&t2).unwrap();

//     let res = t.merge(diff).unwrap();

//     let expected = Test { a: 10 };

//     assert_eq!(expected, res);

//     let t3 = Test { a: 2 };

//     let diff = t.diff(&t3).unwrap();

//     let res = t.merge(diff).unwrap();

//     let expected = Test { a: 2 };

//     assert_eq!(expected, res);
// }

// #[test]
// fn test_tuple_struct() {
//     let t = TestTuple(String::from("Some String"));
//     let t2 = TestTuple(String::from("Some String"));

//     let diff = t.diff(&t2).unwrap();

//     let res = t.merge(diff).unwrap();

//     let expected = TestTuple(String::from("Some String"));

//     assert_eq!(expected, res);

//     let t3 = TestTuple(String::from("Some new String"));

//     let diff = t.diff(&t3).unwrap();

//     let res = t.merge(diff).unwrap();

//     let expected = TestTuple(String::from("Some new String"));

//     assert_eq!(expected, res);
// }

// #[test]
// fn test_unit_struct() {
//     let t = TestUnit;

//     let t2 = TestUnit;

//     let diff = t.diff(&t2).unwrap();

//     let res = t.merge(diff).unwrap();

//     let expected = TestUnit;

//     assert_eq!(expected, res);
// }

// #[test]
// fn test_generic_struct() {
//     let t = SomeGeneric::<usize>(10);

//     let t2 = SomeGeneric::<usize>(20);

//     let diff = t.diff(&t2).unwrap();

//     let res = t.merge(diff).unwrap();

//     let expected = SomeGeneric::<usize>(20);

//     assert_eq!(expected, res)
// }

// #[test]
// fn test_embed() {
//     let t = TestMixture(Test { a: 10 });

//     let t2 = TestMixture(Test { a: 20 });

//     let diff = t.diff(&t2).unwrap();

//     let res = t.merge(diff).unwrap();

//     let expected = TestMixture(Test { a: 20 });

//     assert_eq!(expected, res);

//     let t = TestNest { a: Test { a: 10 } };

//     let t2 = TestNest { a: Test { a: 20 } };

//     let diff = t.diff(&t2).unwrap();

//     let res = t.merge(diff).unwrap();

//     let expected = TestNest { a: Test { a: 20 } };

//     assert_eq!(expected, res);
// }

// #[test]
// fn test_big_struct() {
//     let t = BigStruct {
//         a: vec![1, 2, 3],
//         b: true,
//         c: String::from("Some String"),
//         d: 10,
//     };
//     let t2 = BigStruct {
//         a: vec![1, 2, 3],
//         b: true,
//         c: String::from("Some String"),
//         d: 10,
//     };

//     let diff = t.diff(&t2).unwrap();

//     let res = t.merge(diff).unwrap();

//     let expected = BigStruct {
//         a: vec![1, 2, 3],
//         b: true,
//         c: String::from("Some String"),
//         d: 10,
//     };

//     assert_eq!(expected, res);

//     let t3 = BigStruct {
//         a: vec![5, 6, 7],
//         b: false,
//         c: String::from("Some New String"),
//         d: 15,
//     };

//     let diff = t.diff(&t3).unwrap();

//     let res = t.merge(diff).unwrap();

//     let expected = BigStruct {
//         a: vec![5, 6, 7],
//         b: false,
//         c: String::from("Some New String"),
//         d: 15,
//     };

//     assert_eq!(expected, res);
// }

// #[test]
// fn test_big_tuple() {
//     let t = BigTuple(10, vec![1, 2, 3], true, String::from("Some String"));
//     let t2 = BigTuple(10, vec![1, 2, 3], true, String::from("Some String"));

//     let diff = t.diff(&t2).unwrap();

//     let res = t.merge(diff).unwrap();

//     let expected = BigTuple(10, vec![1, 2, 3], true, String::from("Some String"));

//     assert_eq!(expected, res);

//     let t3 = BigTuple(15, vec![5, 6, 7], false, String::from("Some New String"));

//     let diff = t.diff(&t3).unwrap();

//     let res = t.merge(diff).unwrap();

//     let expected = BigTuple(15, vec![5, 6, 7], false, String::from("Some New String"));

//     assert_eq!(expected, res);
// }

// #[test]
// fn test_ignore_struct() {
//     let t = TestIgnore { a: 10, b: 10 };
//     let t2 = TestIgnore { a: 100, b: 2039123 };

//     let diff = t.diff(&t2).unwrap();

//     let res = t.merge(diff).unwrap();

//     let expected = TestIgnore { b: 10, ..t2 };

//     assert_eq!(expected, res);
// }

// #[test]
// fn test_json_diff() {
//     let t = JsonStruct {
//         a: 10,
//         b: String::from("test"),
//         c: Some(30),
//         d: vec![20, 30, 1],
//     };

//     let t2 = JsonStruct {
//         a: 30,
//         b: String::from("tester"),
//         c: Some(50),
//         d: vec![20, 100],
//     };

//     let diff = t.diff(&t2).unwrap();

//     let json = serde_json::to_string(&diff).unwrap();

//     let diff: DiffJsonStruct = serde_json::from_str(&json).unwrap();

//     let res = t.merge(diff).unwrap();

//     let expected = JsonStruct { c: Some(30), ..t2 };

//     assert_eq!(expected, res);
// }

// #[test]
// fn test_option() {
//     let test_opt_1 = TestOpt::default();
//     let test_opt_2 = TestOpt::default();
//     let diff = test_opt_1.diff(&test_opt_2).unwrap();

//     let json = serde_json::to_string(&diff).unwrap();

//     let expected = "{}";
//     assert_eq!(expected, json);
//     let test_opt_3 = TestOpt {
//         a: None,
//         b: OptTest(Some(10)),
//     };

//     let diff = test_opt_1.diff(&test_opt_3).unwrap();

//     let json = serde_json::to_string(&diff).unwrap();

//     let expected = "{\"b\":10}";
//     assert_eq!(expected, json);

//     let diff = test_opt_3.into_diff().unwrap();

//     let json = serde_json::to_string(&diff).unwrap();

//     assert_eq!(expected, json);
// }

// #[test]
// fn test_from_into() {
//     let t = FromInto {
//         a: Some(String::from("test")),
//         b: vec![String::from("another test")],
//     };

//     let t2 = FromInto {
//         a: None,
//         b: vec![String::from("another test"), String::from("test")],
//     };

//     let diff = t.diff(&t2).unwrap();

//     let json = serde_json::to_string(&diff).unwrap();

//     let expected = r#"{"type":["test"]}"#;

//     assert_eq!(expected, json);

//     let diff: DiffFromInto = serde_json::from_str(&json).unwrap();

//     let merge = t.merge(diff).unwrap();

//     let expected = FromInto {
//         a: Some(String::from("test")),
//         b: vec![String::from("another test"), String::from("test")],
//     };

//     assert_eq!(expected, merge);
// }