// Copyright 2022 The Dawn & Tint Authors
//
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// 1. Redistributions of source code must retain the above copyright notice, this
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// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
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// 3. Neither the name of the copyright holder nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

package container_test

import (
	"sync"
	"testing"

	"dawn.googlesource.com/dawn/tools/src/container"
)

func TestNewMap(t *testing.T) {
	m := container.NewMap[string, int]()
	expectEq(t, "len(m)", len(m), 0)
}

func TestMapAdd(t *testing.T) {
	m := container.NewMap[string, int]()
	m.Add("c", 3)
	expectEq(t, "len(m)", len(m), 1)
	expectEq(t, `m["a"]`, m["a"], 0)
	expectEq(t, `m["b"]`, m["b"], 0)
	expectEq(t, `m["c"]`, m["c"], 3)

	m.Add("a", 1)
	expectEq(t, "len(m)", len(m), 2)
	expectEq(t, `m["a"]`, m["a"], 1)
	expectEq(t, `m["b"]`, m["b"], 0)
	expectEq(t, `m["c"]`, m["c"], 3)

	m.Add("b", 2)
	expectEq(t, "len(m)", len(m), 3)
	expectEq(t, `m["a"]`, m["a"], 1)
	expectEq(t, `m["b"]`, m["b"], 2)
	expectEq(t, `m["c"]`, m["c"], 3)
}

func TestMapRemove(t *testing.T) {
	m := container.NewMap[string, int]()
	m.Add("a", 1)
	m.Add("b", 2)
	m.Add("c", 3)

	m.Remove("c")
	expectEq(t, "len(m)", len(m), 2)
	expectEq(t, `m["a"]`, m["a"], 1)
	expectEq(t, `m["b"]`, m["b"], 2)
	expectEq(t, `m["c"]`, m["c"], 0)

	m.Remove("a")
	expectEq(t, "len(m)", len(m), 1)
	expectEq(t, `m["a"]`, m["a"], 0)
	expectEq(t, `m["b"]`, m["b"], 2)
	expectEq(t, `m["c"]`, m["c"], 0)

	m.Remove("b")
	expectEq(t, "len(m)", len(m), 0)
	expectEq(t, `m["a"]`, m["a"], 0)
	expectEq(t, `m["b"]`, m["b"], 0)
	expectEq(t, `m["c"]`, m["c"], 0)
}

func TestMapContains(t *testing.T) {
	m := container.NewMap[string, int]()
	m.Add("c", 3)
	expectEq(t, `m.Contains("a")`, m.Contains("a"), false)
	expectEq(t, `m.Contains("b")`, m.Contains("b"), false)
	expectEq(t, `m.Contains("c")`, m.Contains("c"), true)

	m.Add("a", 1)
	expectEq(t, `m.Contains("a")`, m.Contains("a"), true)
	expectEq(t, `m.Contains("b")`, m.Contains("b"), false)
	expectEq(t, `m.Contains("c")`, m.Contains("c"), true)

	m.Add("b", 2)
	expectEq(t, `m.Contains("a")`, m.Contains("a"), true)
	expectEq(t, `m.Contains("b")`, m.Contains("b"), true)
	expectEq(t, `m.Contains("c")`, m.Contains("c"), true)
}

func TestMapKeys(t *testing.T) {
	m := container.NewMap[string, int]()
	m.Add("c", 3)
	expectEq(t, `m.Keys()`, m.Keys(), []string{"c"})

	m.Add("a", 1)
	expectEq(t, `m.Keys()`, m.Keys(), []string{"a", "c"})

	m.Add("b", 2)
	expectEq(t, `m.Keys()`, m.Keys(), []string{"a", "b", "c"})
}

func TestMapValues(t *testing.T) {
	m := container.NewMap[string, int]()
	m.Add("c", 1)
	expectEq(t, `m.Values()`, m.Values(), []int{1})

	m.Add("a", 2)
	expectEq(t, `m.Values()`, m.Values(), []int{2, 1})

	m.Add("b", 3)
	expectEq(t, `m.Values()`, m.Values(), []int{2, 3, 1})
}

func TestMapGetOrCreate(t *testing.T) {
	m := container.NewMap[string, int]()

	A := m.GetOrCreate("1", func() int { return 1 })
	expectEq(t, "A", A, 1)

	B := m.GetOrCreate("2", func() int { return 2 })
	expectEq(t, "B", B, 2)

	C := m.GetOrCreate("1", func() int { t.Error("should not be called"); return 0 })
	expectEq(t, "C", C, 1)

	D := m.GetOrCreate("2", func() int { t.Error("should not be called"); return 0 })
	expectEq(t, "D", D, 2)
}

func TestMapGetOrCreateLocked(t *testing.T) {
	m := container.NewMap[string, int]()

	mtx := &sync.RWMutex{}
	wg := sync.WaitGroup{}
	wg.Add(100)
	for i := 0; i < 100; i++ {
		go func() {
			defer wg.Done()
			A := m.GetOrCreateLocked(mtx, "1", func() int { return 1 })
			expectEq(t, "A", A, 1)

			B := m.GetOrCreateLocked(mtx, "2", func() int { return 2 })
			expectEq(t, "B", B, 2)

			C := m.GetOrCreateLocked(mtx, "1", func() int { t.Error("should not be called"); return 0 })
			expectEq(t, "C", C, 1)

			D := m.GetOrCreateLocked(mtx, "2", func() int { t.Error("should not be called"); return 0 })
			expectEq(t, "D", D, 2)
		}()
	}
	wg.Wait()
}