package prompt

import (
    "io"

    "github.com/rs/zerolog/log"
    "github.com/chzyer/readline"
)

type Prompt struct {
    rl *readline.Instance 
}

func NewPrompt() *Prompt {
    rl, err := readline.NewEx(&readline.Config{
		Prompt:          "\033[31m»\033[0m ",
		HistoryFile:     "/tmp/readline.tmp",
		InterruptPrompt: "^C",
		EOFPrompt:       "exit",

		HistorySearchFold:   true,
	})

	if err != nil {
		panic(err)
	}

    return &Prompt{
        rl: rl,
    }
}

func (p *Prompt) StartInteractive() error {
    for {
		line, err := p.rl.Readline()
        if err == readline.ErrInterrupt {
            if len(line) == 0 {
                break
            } else {
                continue
            }
        } else if err == io.EOF {
            break
        }

        switch {
        case line == "exit":
            return nil
        default:
            log.Info().Msgf("Line: %s", line)
        }
    }

    return nil
}

func (p *Prompt) CleanAndRefreshForLogging() {
    p.rl.Clean()
    
    // xxx: Lazy hack to make sure this runs _after_ the log is written. 
    go p.rl.Refresh()
}