package ui

import (
	"fmt"
)

// Message reports progress with messages of different verbosity.
type Message struct {
	term Terminal
	v    uint
}

// NewMessage returns a message progress reporter with underlying terminal
// term.
func NewMessage(term Terminal, verbosity uint) *Message {
	return &Message{
		term: term,
		v:    verbosity,
	}
}

// E reports an error. This message is always printed to stderr.
func (m *Message) E(msg string, args ...interface{}) {
	m.term.Error(fmt.Sprintf(msg, args...))
}

// S prints a message, this is should only be used for very important messages
// that are not errors. The message is even printed if --quiet is specified.
func (m *Message) S(msg string, args ...interface{}) {
	m.term.Print(fmt.Sprintf(msg, args...))
}

// PT prints a message if verbosity >= 1  (neither --quiet nor --verbose is specified)
// and stdout points to a terminal.
// This is used for informational messages.
func (m *Message) PT(msg string, args ...interface{}) {
	if m.term.OutputIsTerminal() && m.v >= 1 {
		m.term.Print(fmt.Sprintf(msg, args...))
	}
}

// P prints a message if verbosity >= 1 (neither --quiet nor --verbose is specified).
// This is used for normal messages which are not errors.
func (m *Message) P(msg string, args ...interface{}) {
	if m.v >= 1 {
		m.term.Print(fmt.Sprintf(msg, args...))
	}
}

// V prints a message if verbosity >= 2 (equivalent to --verbose), this is used for
// verbose messages.
func (m *Message) V(msg string, args ...interface{}) {
	if m.v >= 2 {
		m.term.Print(fmt.Sprintf(msg, args...))
	}
}

// VV prints a message if verbosity >= 3 (equivalent to --verbose=2), this is used for
// debug messages.
func (m *Message) VV(msg string, args ...interface{}) {
	if m.v >= 3 {
		m.term.Print(fmt.Sprintf(msg, args...))
	}
}