// 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.
//
// Author: wsfuyibing <682805@qq.com>
// Date: 2024-07-19

package src

import (
	"fmt"
	"io"
	"os"
)

var singletonOutput *Output

// Output
// is a component used to send message to terminal.
type Output struct{}

// NewOutput
// creates a new Output instance.
func NewOutput() *Output {
	return singletonOutput
}

// Info
// send info message to terminal.
func (o *Output) Info(format string, args ...any) {
	o.send(os.Stdout, format, args...)
}

// Error
// send error message to terminal.
func (o *Output) Error(format string, args ...any) {
	o.send(os.Stderr, format, args...)
}

// Fatal
// send fatal message to terminal.
func (o *Output) Fatal(format string, args ...any) {
	o.send(os.Stderr, format, args...)
}

// Render
// send list of message with info to terminal.
func (o *Output) Render(list []string) {
	for _, s := range list {
		o.Info(s)
	}
}

// +---------------------------------------------------------------------------+
// | Access methods                                                            |
// +---------------------------------------------------------------------------+

func (o *Output) init() *Output {
	return o
}

func (o *Output) send(device io.Writer, format string, args ...any) {
	_, _ = fmt.Fprintf(device, fmt.Sprintf(format, args...)+"\n")
}