package bash

import (
	"fmt"
	"io"
	"strings"
)

// Encoder implements parser.Encoder
type Encoder struct {
	writer io.Writer
	prefix []byte
	indent []byte
}

// Encode is the main function of the parser.Encoder interface
func (e *Encoder) Encode(v interface{}) error {

	// check 'v'
	vcast, ok := v.(*File)
	if !ok {
		return ErrInvalidReceiver
	}

	// empty config
	if len(vcast.Lines) < 1 {
		return nil
	}

	for _, line := range vcast.Lines {

		// line representation
		repr := ""

		// ASSIGNMENT
		if line.Type == ASSIGNMENT {
			repr = fmt.Sprintf("%s%s=%s;", line.Components[0], line.Components[1], line.Components[2])

			// optional comment
			if len(line.Components[3]) > 0 {
				repr += fmt.Sprintf(" #%s", line.Components[3])
			}

			// ANY
		} else {
			repr = strings.Join(line.Components, "")
		}

		repr += "\n"

		_, err := e.writer.Write([]byte(repr))
		if err != nil {
			return err
		}

	}

	return nil
}