/*
Copyright 2017 The Kubernetes Authors.

Licensed 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 explain

import (
	"bytes"
	"testing"

	"k8s.io/apimachinery/pkg/util/diff"
)

func TestFormatterWrite(t *testing.T) {
	buf := bytes.Buffer{}
	f := Formatter{
		Writer: &buf,
	}

	f.Write("Lorem ipsum dolor sit amet, consectetur adipiscing elit.")
	// Indent creates a new Formatter
	f.Indent(5).Write("Morbi at turpis faucibus, gravida dolor ut, fringilla velit.")
	// So Indent(2) doesn't indent to 7 here.
	f.Indent(2).Write("Etiam maximus urna at tellus faucibus mattis.")

	want := `Lorem ipsum dolor sit amet, consectetur adipiscing elit.
     Morbi at turpis faucibus, gravida dolor ut, fringilla velit.
  Etiam maximus urna at tellus faucibus mattis.
`

	if buf.String() != want {
		t.Errorf("Got:\n%v\nWant:\n%v\n", buf.String(), want)
	}
}

func TestFormatterWrappedWrite(t *testing.T) {
	buf := bytes.Buffer{}
	f := Formatter{
		Writer: &buf,
		Wrap:   50,
	}

	f.WriteWrapped("Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi at turpis faucibus, gravida dolor ut, fringilla velit.")
	f.Indent(10).WriteWrapped("Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi at turpis faucibus, gravida dolor ut, fringilla velit.")
	// Test long words (especially urls) on their own line.
	f.Indent(20).WriteWrapped("Lorem ipsum dolor sit amet, consectetur adipiscing elit. ThisIsAVeryLongWordThatDoesn'tFitOnALineOnItsOwn. Morbi at turpis faucibus, gravida dolor ut, fringilla velit.")
	// Test content that includes newlines, bullet points, and blockquotes/code blocks
	f.Indent(4).WriteWrapped(`
This is an
introductory paragraph
that should end
up on a continuous line.

Example:
Example text on its own line

List:
1.  Item with
 wrapping text
11.  Another
 item with wrapping text
* Bullet item
 with wrapping text
- Dash item
 with wrapping text

base64(
    code goes here
    and here
)`)

	want := `Lorem ipsum dolor sit amet, consectetur adipiscing
elit. Morbi at turpis faucibus, gravida dolor ut,
fringilla velit.
          Lorem ipsum dolor sit amet, consectetur
          adipiscing elit. Morbi at turpis
          faucibus, gravida dolor ut, fringilla
          velit.
                    Lorem ipsum dolor sit amet,
                    consectetur adipiscing elit.
                    ThisIsAVeryLongWordThatDoesn'tFitOnALineOnItsOwn.
                    Morbi at turpis faucibus,
                    gravida dolor ut, fringilla
                    velit.
    This is an introductory paragraph that should
    end up on a continuous line.

    Example:
    Example text on its own line

    List:
    1. Item with wrapping text
    11. Another item with wrapping text
    * Bullet item with wrapping text
    - Dash item with wrapping text

    base64(
        code goes here
        and here
    )
`

	if buf.String() != want {
		t.Errorf("Diff:\n%s", diff.StringDiff(buf.String(), want))
	}
}

func TestDefaultWrap(t *testing.T) {
	buf := bytes.Buffer{}
	f := Formatter{
		Writer: &buf,
		// Wrap is not set
	}

	f.WriteWrapped("Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi at turpis faucibus, gravida dolor ut, fringilla velit. Etiam maximus urna at tellus faucibus mattis.")
	want := `Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi at turpis faucibus, gravida dolor ut, fringilla velit. Etiam maximus urna at tellus faucibus mattis.
`
	if buf.String() != want {
		t.Errorf("Got:\n%v\nWant:\n%v\n", buf.String(), want)
	}
}
