/*
 * ========================
 * =====    ===============
 * ======  ================
 * ======  ================
 * ======  ====   ====   ==
 * ======  ===     ==  =  =
 * ======  ===  =  ==     =
 * =  ===  ===  =  ==  ====
 * =  ===  ===  =  ==  =  =
 * ==     =====   ====   ==
 * ========================
 *
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 2023 Joe
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the organization nor the
 *    names of its contributors may be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY JOE ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL JOE BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * hardflip: src/c_hardflip.go
 * Mon, 18 Dec 2023 17:59:45 +0100
 * Joe
 *
 * interfacing with the user
 */

package main

import (
	"os"
	"github.com/gdamore/tcell/v2"
	"golang.org/x/term"
)

func i_draw_text(s tcell.Screen,
		x1, y1, x2, y2 int,
		style tcell.Style, text string) {
	row := y1
	col := x1
	for _, r := range []rune(text) {
		s.SetContent(col, row, r, nil, style)
		col++
		if col >= x2 {
			row++
			col = x1
		}
		if row > y2 {
			break
		}
	}
}

func i_draw_box(s tcell.Screen,
		x1, y1, x2, y2 int,
		title string, content string) {
	style := tcell.StyleDefault.Background(tcell.ColorReset).Foreground(tcell.ColorReset)

	if y2 < y1 {
		y1, y2 = y2, y1
	}
	if x2 < x1 {
		x1, x2 = x2, x1
	}
	// Draw borders
	for col := x1; col <= x2; col++ {
		s.SetContent(col, y1, tcell.RuneHLine, nil, style)
		s.SetContent(col, y2, tcell.RuneHLine, nil, style)
	}
	for row := y1 + 1; row < y2; row++ {
		s.SetContent(x1, row, tcell.RuneVLine, nil, style)
		s.SetContent(x2, row, tcell.RuneVLine, nil, style)
	}

	// Only draw corners if necessary
	if y1 != y2 && x1 != x2 {
		s.SetContent(x1, y1, tcell.RuneULCorner, nil, style)
		s.SetContent(x2, y1, tcell.RuneURCorner, nil, style)
		s.SetContent(x1, y2, tcell.RuneLLCorner, nil, style)
		s.SetContent(x2, y2, tcell.RuneLRCorner, nil, style)
	}

	i_draw_text(s, x1 + 1, y1, x2 - 1, y2 - 1, style, title)
	i_draw_text(s, x1 + 1, y1 + 1, x2 - 1, y2 - 1, style, content)
}

func i_bottom_text(s tcell.Screen, term_w, term_h int, style tcell.Style) {
	i_draw_text(s, 0, term_h - 1, term_w - 1, term_h, style, "(q) Quit")
}

func i_hosts_panel(s tcell.Screen, term_w, term_h int, lhost *HostList) {
	i_draw_box(s, 0, 0,
		term_w / 3, term_h - 2,
		" hosts ", "")
}

func i_info_panel(s tcell.Screen, term_w, term_h int) {
	i_draw_box(s, (term_w / 3) + 1, 0,
		term_w - 1, term_h - 2,
		" infos ", "")
}

func i_ui(lhost *HostList) {
	screen, err := tcell.NewScreen()
	if err != nil {
		c_die("view", err)
	}
	if err := screen.Init(); err != nil {
		c_die("view", err)
	}
	def_style := tcell.StyleDefault.
		Background(tcell.ColorReset).
		Foreground(tcell.ColorReset)
	screen.SetStyle(def_style)
	quit := func() {
		screen.Fini()
		os.Exit(0)
	}
	for {
		term_w, term_h, _ := term.GetSize(0)
		screen.Clear()
		i_bottom_text(screen, term_w, term_h, def_style)
		i_hosts_panel(screen, term_w, term_h, lhost)
		i_info_panel(screen, term_w, term_h)
		screen.Show()
		ev := screen.PollEvent()
		switch ev := ev.(type) {
		case *tcell.EventResize:
			screen.Sync()
		case *tcell.EventKey:
			if ev.Key() == tcell.KeyEscape || ev.Key() == tcell.KeyCtrlC || ev.Rune() == 'q' || ev.Rune() == 'Q' {
				quit()
			}
		}
	}
}