package term // import "github.com/docker/docker/pkg/term"

import (
	"bytes"
	"testing"

	"gotest.tools/v3/assert"
	is "gotest.tools/v3/assert/cmp"
)

func TestEscapeProxyRead(t *testing.T) {
	t.Run("no escape keys, keys a", func(t *testing.T) {
		escapeKeys, _ := ToBytes("")
		keys, _ := ToBytes("a")
		reader := NewEscapeProxy(bytes.NewReader(keys), escapeKeys)

		buf := make([]byte, len(keys))
		nr, err := reader.Read(buf)
		assert.NilError(t, err)
		assert.Equal(t, nr, len(keys))
		assert.DeepEqual(t, keys, buf)
	})

	t.Run("no escape keys, keys a,b,c", func(t *testing.T) {
		escapeKeys, _ := ToBytes("")
		keys, _ := ToBytes("a,b,c")
		reader := NewEscapeProxy(bytes.NewReader(keys), escapeKeys)

		buf := make([]byte, len(keys))
		nr, err := reader.Read(buf)
		assert.NilError(t, err)
		assert.Equal(t, nr, len(keys))
		assert.DeepEqual(t, keys, buf)
	})

	t.Run("no escape keys, no keys", func(t *testing.T) {
		escapeKeys, _ := ToBytes("")
		keys, _ := ToBytes("")
		reader := NewEscapeProxy(bytes.NewReader(keys), escapeKeys)

		buf := make([]byte, len(keys))
		nr, err := reader.Read(buf)
		assert.Assert(t, is.ErrorContains(err, ""), "Should throw error when no keys are to read")
		assert.Equal(t, nr, 0)
		assert.Check(t, is.Len(keys, 0))
		assert.Check(t, is.Len(buf, 0))
	})

	t.Run("DEL escape key, keys a,b,c,+", func(t *testing.T) {
		escapeKeys, _ := ToBytes("DEL")
		keys, _ := ToBytes("a,b,c,+")
		reader := NewEscapeProxy(bytes.NewReader(keys), escapeKeys)

		buf := make([]byte, len(keys))
		nr, err := reader.Read(buf)
		assert.NilError(t, err)
		assert.Equal(t, nr, len(keys))
		assert.DeepEqual(t, keys, buf)
	})

	t.Run("DEL escape key, no keys", func(t *testing.T) {
		escapeKeys, _ := ToBytes("DEL")
		keys, _ := ToBytes("")
		reader := NewEscapeProxy(bytes.NewReader(keys), escapeKeys)

		buf := make([]byte, len(keys))
		nr, err := reader.Read(buf)
		assert.Assert(t, is.ErrorContains(err, ""), "Should throw error when no keys are to read")
		assert.Equal(t, nr, 0)
		assert.Check(t, is.Len(keys, 0))
		assert.Check(t, is.Len(buf, 0))
	})

	t.Run("ctrl-x,ctrl-@ escape key, keys DEL", func(t *testing.T) {
		escapeKeys, _ := ToBytes("ctrl-x,ctrl-@")
		keys, _ := ToBytes("DEL")
		reader := NewEscapeProxy(bytes.NewReader(keys), escapeKeys)

		buf := make([]byte, len(keys))
		nr, err := reader.Read(buf)
		assert.NilError(t, err)
		assert.Equal(t, nr, 1)
		assert.DeepEqual(t, keys, buf)
	})

	t.Run("ctrl-c escape key, keys ctrl-c", func(t *testing.T) {
		escapeKeys, _ := ToBytes("ctrl-c")
		keys, _ := ToBytes("ctrl-c")
		reader := NewEscapeProxy(bytes.NewReader(keys), escapeKeys)

		buf := make([]byte, len(keys))
		nr, err := reader.Read(buf)
		assert.Error(t, err, "read escape sequence")
		assert.Equal(t, nr, 0)
		assert.DeepEqual(t, keys, buf)
	})

	t.Run("ctrl-c,ctrl-z escape key, keys ctrl-c,ctrl-z", func(t *testing.T) {
		escapeKeys, _ := ToBytes("ctrl-c,ctrl-z")
		keys, _ := ToBytes("ctrl-c,ctrl-z")
		reader := NewEscapeProxy(bytes.NewReader(keys), escapeKeys)

		buf := make([]byte, 1)
		nr, err := reader.Read(buf)
		assert.NilError(t, err)
		assert.Equal(t, nr, 0)
		assert.DeepEqual(t, keys[0:1], buf)

		nr, err = reader.Read(buf)
		assert.Error(t, err, "read escape sequence")
		assert.Equal(t, nr, 0)
		assert.DeepEqual(t, keys[1:], buf)
	})

	t.Run("ctrl-c,ctrl-z escape key, keys ctrl-c,DEL,+", func(t *testing.T) {
		escapeKeys, _ := ToBytes("ctrl-c,ctrl-z")
		keys, _ := ToBytes("ctrl-c,DEL,+")
		reader := NewEscapeProxy(bytes.NewReader(keys), escapeKeys)

		buf := make([]byte, 1)
		nr, err := reader.Read(buf)
		assert.NilError(t, err)
		assert.Equal(t, nr, 0)
		assert.DeepEqual(t, keys[0:1], buf)

		buf = make([]byte, len(keys))
		nr, err = reader.Read(buf)
		assert.NilError(t, err)
		assert.Equal(t, nr, len(keys))
		assert.DeepEqual(t, keys, buf)
	})

	t.Run("ctrl-c,ctrl-z escape key, keys ctrl-c,DEL", func(t *testing.T) {
		escapeKeys, _ := ToBytes("ctrl-c,ctrl-z")
		keys, _ := ToBytes("ctrl-c,DEL")
		reader := NewEscapeProxy(bytes.NewReader(keys), escapeKeys)

		buf := make([]byte, 1)
		nr, err := reader.Read(buf)
		assert.NilError(t, err)
		assert.Equal(t, nr, 0)
		assert.DeepEqual(t, keys[0:1], buf)

		buf = make([]byte, len(keys))
		nr, err = reader.Read(buf)
		assert.NilError(t, err)
		assert.Equal(t, nr, len(keys))
		assert.DeepEqual(t, keys, buf)
	})

}