// Licensed to the LF AI & Data foundation under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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.

package vralloc

import (
	"sync"
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestGroupedAllocator(t *testing.T) {
	t.Run("test allocator", func(t *testing.T) {
		a := NewGroupedAllocatorBuilder("a", &Resource{100, 100, 100}).
			AddChild("c1", &Resource{10, 10, 10}).
			AddChild("c2", &Resource{10, 10, 10}).
			AddChild("c3", &Resource{90, 90, 90}).
			Build()

		c1 := a.GetAllocator("c1")
		c2 := a.GetAllocator("c2")
		c3 := a.GetAllocator("c3")

		// Allocate
		allocated, _ := c1.Allocate("x11", &Resource{10, 10, 10})
		assert.Equal(t, true, allocated)
		allocated, short := c1.Allocate("x12", &Resource{90, 90, 90})
		assert.Equal(t, false, allocated)
		assert.Equal(t, &Resource{90, 90, 90}, short)
		allocated, _ = c2.Allocate("x21", &Resource{10, 10, 10})
		assert.Equal(t, true, allocated)
		allocated, short = c3.Allocate("x31", &Resource{90, 90, 90})
		assert.Equal(t, false, allocated)
		assert.Equal(t, &Resource{10, 10, 10}, short)
		inspect[string](a)

		// Release
		c1.Release("x11")
		allocated, _ = c3.Allocate("x31", &Resource{90, 90, 90})
		assert.Equal(t, true, allocated)

		// Inspect
		m := a.Inspect()
		assert.Equal(t, 3, len(m))
	})

	t.Run("test 3 level", func(t *testing.T) {
		//     a
		//  c1   c2
		//     c3   c4
		// Leaf nodes: c1, c3, c4

		root := NewGroupedAllocatorBuilder("a", &Resource{100, 100, 100}).
			AddChild("c1", &Resource{100, 100, 100}).
			AddChildGroup(NewGroupedAllocatorBuilder("c2", &Resource{100, 100, 100}).AddChild("c3", &Resource{100, 100, 100}).AddChild("c4", &Resource{100, 100, 100}).Build()).
			Build()

		c1 := root.GetAllocator("c1")
		c2 := root.GetAllocator("c2").(*GroupedAllocator)
		c3 := c2.GetAllocator("c3")
		// c4 := c2.GetAllocator("c4")

		// Allocate
		allocated, _ := c1.Allocate("x11", &Resource{100, 100, 100})
		assert.Equal(t, true, allocated)
		allocated, _ = c2.Allocate("x12", &Resource{90, 90, 90})
		assert.Equal(t, false, allocated) // allocation on grouped allocator is not allowed
		allocated, _ = c3.Allocate("x21", &Resource{10, 10, 10})
		assert.Equal(t, false, allocated) // not enough resource

		wg := new(sync.WaitGroup)
		wg.Add(1)
		go func() {
			allocated, _ = c3.Allocate("x21", &Resource{10, 10, 10})
			if !allocated {
				c3.Wait()
				allocated, _ = c3.Allocate("x21", &Resource{10, 10, 10})
				assert.Equal(t, true, allocated)
			}
			wg.Done()
		}()

		c1.Release("x11")
		wg.Wait()
	})
}