package web

import (
	"html/template"
	"strconv"
	"time"
)

func (s *Server) templateFuncs() template.FuncMap {
	return template.FuncMap{
		"asset":      s.asset,
		"num":        num,
		"dateLong":   dateLong,
		"dateShort":  dateShort,
		"weekday":    weekday,
		"add":        func(a, b int) int { return a + b },
		"pluralDays": pluralDays,
		"tileTitle":  tileTitle,
	}
}

// num renders an optional number for a form field: blank stays blank, so an
// unlogged day does not come back pre-filled with a zero.
func num(p *int) string {
	if p == nil {
		return ""
	}
	return strconv.Itoa(*p)
}

// dateLong renders "Thursday 31 July" for the day being logged.
func dateLong(t time.Time) string {
	return t.Format("Monday 2 January")
}

// dateShort renders "31 Jul" for the tiles.
func dateShort(t time.Time) string {
	return t.Format("2 Jan")
}

func weekday(t time.Time) string {
	return t.Format("Mon")
}

func pluralDays(n int) string {
	if n == 1 {
		return "1 day"
	}
	return strconv.Itoa(n) + " days"
}

// tileTitle is the hover and screen-reader text for a square on the card.
func tileTitle(v dayView) string {
	label := "Day " + strconv.Itoa(v.Number) + ", " + dateShort(v.Time) + " — "
	switch {
	case v.IsFuture:
		return label + "still ahead"
	case v.Marks.Complete():
		return label + "all five"
	case v.Score == 0:
		return label + "nothing logged"
	default:
		return label + strconv.Itoa(v.Score) + " of 5"
	}
}