package table

import (
	"strings"
)

type render struct {
	tab       *Table
	lineLen   int
	separator string
}

func newRender(tab *Table) render {
	r := render{
		tab:     tab,
		lineLen: len(tab.lengths) + 1,
	}

	var separator strings.Builder

	for _, len := range tab.lengths {
		separator.WriteString("+")
		separator.WriteString(strings.Repeat("-", len+2))
		r.lineLen += len + 3
	}

	r.separator = tab.sprintf("%s+", separator.String()) + "\n"
	return r
}

func (r render) String() string {
	var sb strings.Builder

	sb.WriteString(r.separator)
	sb.WriteString(r.rowString(r.tab.headers, r.tab.sheaderf))

	sb.WriteString(r.separator)
	for _, row := range r.tab.rows {
		sb.WriteString(r.rowString(row, r.tab.sprintf))
	}
	sb.WriteString(r.separator)

	return sb.String()
}

func (r render) rowString(row []string, stextf formatFunc) string {
	var (
		sb     strings.Builder
		sbasef = r.tab.sprintf
	)

	for i, col := range row {
		sb.WriteString(sbasef("| "))
		sb.WriteString(stextf("%s", col))
		sb.WriteString(sbasef(" "))
		for j := len(col); j < r.tab.lengths[i]; j++ {
			sb.WriteString(sbasef(" "))
		}
	}
	sb.WriteString(sbasef("|"))

	return sb.String() + "\n"
}