package grpcutils

import (
	"context"
	"testing"

	"github.com/prysmaticlabs/prysm/shared/testutil/assert"
	"github.com/prysmaticlabs/prysm/shared/testutil/require"
	logTest "github.com/sirupsen/logrus/hooks/test"
	"google.golang.org/grpc/metadata"
)

func TestAppendHeaders(t *testing.T) {
	t.Run("One header", func(t *testing.T) {
		ctx := AppendHeaders(context.Background(), []string{"first=value1"})
		md, ok := metadata.FromOutgoingContext(ctx)
		require.Equal(t, true, ok, "Failed to read context metadata")
		require.Equal(t, 1, md.Len(), "Metadata contains wrong number of values")
		assert.Equal(t, "value1", md.Get("first")[0])
	})

	t.Run("Multiple headers", func(t *testing.T) {
		ctx := AppendHeaders(context.Background(), []string{"first=value1", "second=value2"})
		md, ok := metadata.FromOutgoingContext(ctx)
		require.Equal(t, true, ok, "Failed to read context metadata")
		require.Equal(t, 2, md.Len(), "Metadata contains wrong number of values")
		assert.Equal(t, "value1", md.Get("first")[0])
		assert.Equal(t, "value2", md.Get("second")[0])
	})

	t.Run("One empty header", func(t *testing.T) {
		ctx := AppendHeaders(context.Background(), []string{"first=value1", ""})
		md, ok := metadata.FromOutgoingContext(ctx)
		require.Equal(t, true, ok, "Failed to read context metadata")
		require.Equal(t, 1, md.Len(), "Metadata contains wrong number of values")
		assert.Equal(t, "value1", md.Get("first")[0])
	})

	t.Run("Incorrect header", func(t *testing.T) {
		logHook := logTest.NewGlobal()
		ctx := AppendHeaders(context.Background(), []string{"first=value1", "second"})
		md, ok := metadata.FromOutgoingContext(ctx)
		require.Equal(t, true, ok, "Failed to read context metadata")
		require.Equal(t, 1, md.Len(), "Metadata contains wrong number of values")
		assert.Equal(t, "value1", md.Get("first")[0])
		assert.LogsContain(t, logHook, "Skipping second")
	})

	t.Run("Header value with equal sign", func(t *testing.T) {
		ctx := AppendHeaders(context.Background(), []string{"first=value=1"})
		md, ok := metadata.FromOutgoingContext(ctx)
		require.Equal(t, true, ok, "Failed to read context metadata")
		require.Equal(t, 1, md.Len(), "Metadata contains wrong number of values")
		assert.Equal(t, "value=1", md.Get("first")[0])
	})
}