package tui

import (
	"bytes"
	"fmt"
)

// Clear clears the screen.
func Clear() {
	_, h := termSize()
	buf := make([]byte, 2*h)
	for i := range buf {
		buf[i] = '\n'
	}
	mustWrite(buf)
}

// Line prints a line across the screen followed by a newline.
func PrintLine() {
	w, _ := termSize()

	runes := make([]rune, w)
	for i := range runes {
		runes[i] = '━'
	}

	runes[0] = '┅'
	runes[len(runes)-2] = '┅'
	runes[len(runes)-1] = '\n'

	buf := []byte(string(runes))
	mustWrite(buf)
}

// Prints a box around text followed by a newline.
func PrintBoxed(s string, args ...interface{}) {
	if len(args) > 0 {
		s = fmt.Sprintf(s, args...)
	}

	w, _ := termSize()

	lines, textWidth := wrapText(s, w-4)

	if w < textWidth+4 {
		w = textWidth + 4
	}

	buf := &bytes.Buffer{}

	// Top of box.
	buf.Write([]byte("╭"))
	for i := 0; i < w-2; i++ {
		buf.Write([]byte("─"))
	}
	buf.Write([]byte("╮\n"))

	// Lines.
	for _, line := range lines {
		buf.Write([]byte("│ "))
		buf.Write([]byte(line))
		for i := len([]rune(line)); i < w-4; i++ {
			buf.Write([]byte(" "))
		}
		buf.Write([]byte(" │\n"))
	}

	// Bottom of box.
	buf.Write([]byte("╰"))
	for i := 0; i < w-2; i++ {
		buf.Write([]byte("─"))
	}
	buf.Write([]byte("╯\n"))

	mustWrite(buf.Bytes())
}

// Print a string to the terminal followed by a newline. No wrapping.
func PrintString(s string, args ...interface{}) {
	if len(args) > 0 {
		s = fmt.Sprintf(s, args...)
	}
	mustWrite([]byte(s + "\n"))
}

// Format and wrap text, print to screen with given prefix on each wrapped
// line.
func PrintTextWithPrefix(prefix, s string, args ...interface{}) {
	if len(args) > 0 {
		s = fmt.Sprintf(s, args...)
	}
	indent := len([]rune(prefix))
	//sIndent := strings.Repeat(" ", indent)
	w, _ := termSize()
	lines, _ := wrapText(s, w-1-indent)
	for _, line := range lines {
		PrintString(prefix + line)
	}
}

func PrintText(s string, args ...interface{}) {
	PrintTextWithPrefix("", s, args...)
}