package docs

import (
	"bytes"
	"io"
	"strings"
	"testing"

	"github.com/spf13/cobra"
	"github.com/stretchr/testify/assert"
)

func TestCommandWithNilRoot(t *testing.T) {
	cmd := Command(nil)
	assert.NotNil(t, cmd)
	cmd.SetArgs([]string{"-o", "foo"})
	err := cmd.Execute()
	assert.Error(t, err)
}

func TestCommandWithoutArgs(t *testing.T) {
	cmd := Command(&cobra.Command{})
	assert.NotNil(t, cmd)
	err := cmd.Execute()
	assert.Error(t, err)
}

func TestCommandWithInvalidArg(t *testing.T) {
	cmd := Command(&cobra.Command{})
	assert.NotNil(t, cmd)
	b := bytes.NewBufferString("")
	cmd.SetErr(b)
	cmd.SetArgs([]string{"foo"})
	err := cmd.Execute()
	assert.Error(t, err)
	out, err := io.ReadAll(b)
	assert.NoError(t, err)
	expected := `Error: unknown command "foo" for "docs"`
	assert.Equal(t, strings.TrimSpace(expected), strings.TrimSpace(string(out)))
}

func TestCommandWithInvalidFlag(t *testing.T) {
	cmd := Command(&cobra.Command{})
	assert.NotNil(t, cmd)
	b := bytes.NewBufferString("")
	cmd.SetErr(b)
	cmd.SetArgs([]string{"--xxx"})
	err := cmd.Execute()
	assert.Error(t, err)
	out, err := io.ReadAll(b)
	assert.NoError(t, err)
	expected := `Error: unknown flag: --xxx`
	assert.Equal(t, strings.TrimSpace(expected), strings.TrimSpace(string(out)))
}

func TestCommandHelp(t *testing.T) {
	cmd := Command(&cobra.Command{})
	assert.NotNil(t, cmd)
	b := bytes.NewBufferString("")
	cmd.SetOut(b)
	cmd.SetArgs([]string{"--help"})
	err := cmd.Execute()
	assert.NoError(t, err)
	out, err := io.ReadAll(b)
	assert.NoError(t, err)
	assert.True(t, strings.HasPrefix(string(out), cmd.Long))
}