// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use googletest::prelude::*;
use indoc::indoc;

#[test]
fn elements_are_matches_vector() -> Result<()> {
    let value = vec![1, 2, 3];
    verify_that!(value, elements_are![eq(&1), eq(&2), eq(&3)])
}

#[test]
fn elements_are_matches_slice() -> Result<()> {
    let value = vec![1, 2, 3];
    let slice = value.as_slice();
    verify_that!(slice, elements_are![eq(&1), eq(&2), eq(&3)])
}

#[test]
fn elements_are_matches_array() -> Result<()> {
    verify_that!([1, 2, 3], elements_are![eq(1), eq(2), eq(3)])
}

#[test]
fn elements_are_supports_trailing_comma() -> Result<()> {
    let value = vec![1, 2, 3];
    verify_that!(value, elements_are![eq(&1), eq(&2), eq(&3),])
}

#[test]
fn elements_are_returns_no_match_when_expected_and_actual_sizes_differ() -> Result<()> {
    let value = vec![1, 2];
    verify_that!(value, not(elements_are![eq(&1), eq(&2), eq(&3)]))
}

#[test]
fn elements_are_admits_matchers_without_static_lifetime() -> Result<()> {
    #[derive(Debug, PartialEq)]
    struct AStruct(i32);
    let expected_value = AStruct(123);
    verify_that!(vec![AStruct(123)], elements_are![eq(&expected_value)])
}

#[test]
fn elements_are_matches_iterator_returning_by_value() -> Result<()> {
    #[derive(Debug, Copy, Clone)]
    struct Countdown(i32);
    impl Iterator for Countdown {
        type Item = i32;

        fn next(&mut self) -> Option<Self::Item> {
            match self.0 {
                0 => None,
                x => {
                    self.0 -= 1;
                    Some(x)
                }
            }
        }
    }
    verify_that!(Countdown(3), elements_are![eq(3), eq(2), eq(1)])
}

#[test]
fn elements_are_produces_correct_failure_message() -> Result<()> {
    let result = verify_that!(vec![1, 4, 3], elements_are![eq(&1), eq(&2), eq(&3)]);
    verify_that!(
        result,
        err(displays_as(contains_substring(indoc!(
            "
                Value of: vec![1, 4, 3]
                Expected: has elements:
                  0. is equal to 1
                  1. is equal to 2
                  2. is equal to 3
                Actual: [1, 4, 3],
                  where element #1 is 4, which isn't equal to 2"
        ))))
    )
}

#[test]
fn elements_are_produces_correct_failure_message_nested() -> Result<()> {
    let result = verify_that!(
        vec![vec![0, 1], vec![1, 2]],
        elements_are![elements_are![eq(&1), eq(&2)], elements_are![eq(&2), eq(&3)]]
    );
    verify_that!(
        result,
        err(displays_as(contains_substring(indoc!(
            "
                Expected: has elements:
                  0. has elements:
                       0. is equal to 1
                       1. is equal to 2
                  1. has elements:
                       0. is equal to 2
                       1. is equal to 3
                Actual: [[0, 1], [1, 2]],
                  where:
                    * element #0 is [0, 1], where:
                        * element #0 is 0, which isn't equal to 1
                        * element #1 is 1, which isn't equal to 2
                    * element #1 is [1, 2], where:
                        * element #0 is 1, which isn't equal to 2
                        * element #1 is 2, which isn't equal to 3"
        ))))
    )
}

#[test]
fn elements_are_explain_match_wrong_size() -> Result<()> {
    let matcher = elements_are![eq(&1)];
    verify_that!(matcher.explain_match(&vec![1, 2]), displays_as(eq("whose size is 2")))
}

fn create_matcher<'a>() -> impl Matcher<&'a Vec<i32>> {
    elements_are![eq(&1)]
}

#[test]
fn elements_are_works_when_matcher_is_created_in_subroutine() -> Result<()> {
    verify_that!(vec![1], create_matcher())
}

#[test]
fn elements_are_implicitly_called() -> Result<()> {
    verify_that!(vec![1, 2, 3], [eq(&1), eq(&2), eq(&3)])
}

#[test]
fn elements_are_with_auto_eq() -> Result<()> {
    verify_that!(vec![1, 2, 3], [&1, &2, lt(&43)])
}