package pmap

import "testing"

func TestPmap(t *testing.T) {
	p := New()
	const numElems = 100
	for i := range iter(numElems) {
		p = p.Set(i, i)
	}
	if p.Len() != numElems {
		t.Fatalf("Len() = %v, want %v", p.Len(), numElems)
	}
	for i := range iter(numElems) {
		v, ok := p.Get(i)
		if v != i || !ok {
			t.Errorf("Get(%d) = %v %v, want %v %v", i, v, ok, i, true)
		}
	}
}

func BenchmarkGet(b *testing.B) {
	b.Run("size=10", func(b *testing.B) { benchmarkGet(b, 10) })
	b.Run("size=100", func(b *testing.B) { benchmarkGet(b, 100) })
	b.Run("size=1000", func(b *testing.B) { benchmarkGet(b, 1000) })
	b.Run("size=10000", func(b *testing.B) { benchmarkGet(b, 10000) })
}

func BenchmarkGetAbsent(b *testing.B) {
	b.Run("size=10", func(b *testing.B) { benchmarkGetAbsent(b, 10) })
	b.Run("size=100", func(b *testing.B) { benchmarkGetAbsent(b, 100) })
	b.Run("size=1000", func(b *testing.B) { benchmarkGetAbsent(b, 1000) })
	b.Run("size=10000", func(b *testing.B) { benchmarkGetAbsent(b, 10000) })
}

func benchmarkGet(b *testing.B, numElems int) {
	p := New()
	for i := range iter(numElems) {
		p = p.Set(i, i)
	}
	if p.Len() != numElems {
		b.Fatalf("Len() = %v, want %v", p.Len(), numElems)
	}
	b.ResetTimer()
	i := 0
	for range iter(b.N) {
		v, ok := p.Get(i)
		if v != i || !ok {
			b.Errorf("Get(%d) = %v %v, want %v %v", i, v, ok, i, true)
		}
		i++
		if i >= numElems {
			i = 0
		}
	}
}

func benchmarkGetAbsent(b *testing.B, numElems int) {
	p := New()
	for i := range iter(numElems) {
		p = p.Set(-i-1, i)
	}
	if p.Len() != numElems {
		b.Fatalf("Len() = %v, want %v", p.Len(), numElems)
	}
	b.ResetTimer()
	i := 0
	for range iter(b.N) {
		v, ok := p.Get(i)
		if ok {
			b.Errorf("Get(%d) = %v %v, want %v %v", i, v, ok, 0, false)
		}
		i++
	}
}

func iter(n int) []struct{} {
	return make([]struct{}, n)
}

func BenchmarkHmapGet_baseline(b *testing.B) {
	b.Run("size=10", func(b *testing.B) { benchmarkHmapGet(b, 10) })
	b.Run("size=100", func(b *testing.B) { benchmarkHmapGet(b, 100) })
	b.Run("size=1000", func(b *testing.B) { benchmarkHmapGet(b, 1000) })
	b.Run("size=10000", func(b *testing.B) { benchmarkHmapGet(b, 10000) })
}

func benchmarkHmapGet(b *testing.B, numElems int) {
	h := make(map[int]int)
	for i := range iter(numElems) {
		h[i] = i
	}
	if len(h) != numElems {
		b.Fatalf("Len() = %v, want %v", len(h), numElems)
	}
	b.ResetTimer()
	i := 0
	for range iter(b.N) {
		v, ok := h[i]
		if v != i || !ok {
			b.Errorf("h[%d] = %v %v, want %v %v", i, v, ok, i, true)
		}
		i++
		if i >= numElems {
			i = 0
		}
	}
}