package main

import (
	`embed`
	"strings"
	`text/template`

	"github.com/go-playground/validator/v10"
)

var (
	args     = new(Args)
	validate = validator.New(validator.WithRequiredStructEnabled())
)

const (
	/*
		fixedPad is a fixed "surrounding" pad always present (as minimum), even for values max len on columns.
		*Must* be positive even, as <fixed left pad> and <fixed right pad> == fixedPad/2.
	*/
	fixedPad int = 2
	/*
		padChars is what fills the pads in table cells.
		At the *LEAST*, a cell will be "<fixedPad/2 * padChars><str><fixedPad/2 * padChars>"
	*/
	padChars string = " "
)

var (
	//go:embed "_tpl"
	tplDir embed.FS
	tblTpl *template.Template = template.Must(template.New("").Funcs(
		template.FuncMap{
			"legacy4": tplClass4Iter,
			"addrs":   tplAddrIter,
			"mask4":   tplMaskIter4,
		},
	).ParseFS(tplDir, "_tpl/*.tpl"))
)

var (
	// Primarily output formatting stuff in this block.
	sectSepCnt = 48
	sectSep1   = strings.Repeat("=", sectSepCnt)
	sectSep2   = strings.Repeat("-", sectSepCnt)
	sectSep3   = strings.Repeat(".", sectSepCnt)
	// tblFmts contains a lookup of map[<is plain>]*tableFormatter.
	tblFmts map[bool]*tableFormatter = map[bool]*tableFormatter{
		// Plaintext/ASCII-only
		true: &tableFormatter{
			TopLeftHdr:      "*", // Or _
			TopFillHdr:      "*", // ""
			TopColSepHdr:    "*", // ""
			TopRightHdr:     "*", // ""
			ColSepHdr:       "|",
			BottomLeftHdr:   "*", // Or +
			BottomFillHdr:   "*", // Or -
			BottomColSepHdr: "*", // Or +
			BottomRightHdr:  "*", // ""
			Left:            "|",
			Fill:            "-",
			LineColSep:      "|",
			LineLeft:        "|",
			LineRight:       "|",
			ColSep:          "|",
			Right:           "|",
			LastLeft:        "+",
			LastFill:        "-",
			LastSep:         "-",
			LastRight:       "+",
			SuppressLineSep: true,
			NoUpperTitle:    false,
			NoBoldTitle:     true,
		},
		// Unicode/UTF-8
		// https://en.wikipedia.org/wiki/Box-drawing_characters
		false: &tableFormatter{
			TopLeftHdr:      "┏",
			TopFillHdr:      "━",
			TopColSepHdr:    "┳",
			TopRightHdr:     "┓",
			ColSepHdr:       "┃",
			BottomLeftHdr:   "┣",
			BottomFillHdr:   "━",
			BottomColSepHdr: "╇",
			BottomRightHdr:  "┫",
			Left:            "┃",
			Fill:            "─",
			LineColSep:      "┼",
			LineLeft:        "┠",
			LineRight:       "┨",
			ColSep:          "│",
			Right:           "┃",
			LastLeft:        "┗",
			LastFill:        "━",
			LastSep:         "┷",
			LastRight:       "┛",
			SuppressLineSep: false,
			NoUpperTitle:    true,
			NoBoldTitle:     false,
		},
	}
)