// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package http2

import (
	"testing"
)

func TestPriority(t *testing.T) {
	// A -> B
	// move A's parent to B
	streams := make(map[uint32]*stream)
	a := &stream{
		parent: nil,
		weight: 16,
	}
	streams[1] = a
	b := &stream{
		parent: a,
		weight: 16,
	}
	streams[2] = b
	adjustStreamPriority(streams, 1, PriorityParam{
		Weight:    20,
		StreamDep: 2,
	})
	if a.parent != b {
		t.Errorf("Expected A's parent to be B")
	}
	if a.weight != 20 {
		t.Errorf("Expected A's weight to be 20; got %d", a.weight)
	}
	if b.parent != nil {
		t.Errorf("Expected B to have no parent")
	}
	if b.weight != 16 {
		t.Errorf("Expected B's weight to be 16; got %d", b.weight)
	}
}

func TestPriorityExclusiveZero(t *testing.T) {
	// A B and C are all children of the 0 stream.
	// Exclusive reprioritization to any of the streams
	// should bring the rest of the streams under the
	// reprioritized stream
	streams := make(map[uint32]*stream)
	a := &stream{
		parent: nil,
		weight: 16,
	}
	streams[1] = a
	b := &stream{
		parent: nil,
		weight: 16,
	}
	streams[2] = b
	c := &stream{
		parent: nil,
		weight: 16,
	}
	streams[3] = c
	adjustStreamPriority(streams, 3, PriorityParam{
		Weight:    20,
		StreamDep: 0,
		Exclusive: true,
	})
	if a.parent != c {
		t.Errorf("Expected A's parent to be C")
	}
	if a.weight != 16 {
		t.Errorf("Expected A's weight to be 16; got %d", a.weight)
	}
	if b.parent != c {
		t.Errorf("Expected B's parent to be C")
	}
	if b.weight != 16 {
		t.Errorf("Expected B's weight to be 16; got %d", b.weight)
	}
	if c.parent != nil {
		t.Errorf("Expected C to have no parent")
	}
	if c.weight != 20 {
		t.Errorf("Expected C's weight to be 20; got %d", b.weight)
	}
}

func TestPriorityOwnParent(t *testing.T) {
	streams := make(map[uint32]*stream)
	a := &stream{
		parent: nil,
		weight: 16,
	}
	streams[1] = a
	b := &stream{
		parent: a,
		weight: 16,
	}
	streams[2] = b
	adjustStreamPriority(streams, 1, PriorityParam{
		Weight:    20,
		StreamDep: 1,
	})
	if a.parent != nil {
		t.Errorf("Expected A's parent to be nil")
	}
	if a.weight != 20 {
		t.Errorf("Expected A's weight to be 20; got %d", a.weight)
	}
	if b.parent != a {
		t.Errorf("Expected B's parent to be A")
	}
	if b.weight != 16 {
		t.Errorf("Expected B's weight to be 16; got %d", b.weight)
	}

}