Calendar: components 421-440

countdown.go

@@ -0,0 +1,103 @@
+package mujica
+
+import (
+	"fmt"
+	"log/slog"
+	"time"
+
+	"github.com/egoist/mygo/ui"
+
+	"mujicaui/theme"
+)
+
+// CountdownFormat chooses how the time left reads.
+type CountdownFormat int
+
+const (
+	// CountdownClock reads 01:02:03, with days as "2d" first.
+	CountdownClock CountdownFormat = iota
+	// CountdownWords reads "1 h 2 min 3 s".
+	CountdownWords
+)
+
+// CountdownOptions configure a Countdown.
+type CountdownOptions struct {
+	Format CountdownFormat
+	// Now fixes the clock and stops updates.
+	Now   time.Time
+	Label string
+}
+
+// CountdownResult is the countdown and its finish.
+type CountdownResult struct {
+	Element  *ui.Element
+	finished bool
+}
+
+// Finished reports reaching zero, once per deadline.
+func (r CountdownResult) Finished() bool { return r.finished }
+
+// Countdown shows the time left, ticking each second while shown.
+func Countdown(c *ui.Context, deadline time.Time, opts CountdownOptions) CountdownResult {
+	if opts.Format < CountdownClock || opts.Format > CountdownWords {
+		panic(fmt.Sprintf("mujica: Countdown Format %d out of range", opts.Format))
+	}
+	k := Tokens(c)
+	now := opts.Now
+	live := now.IsZero()
+	if live {
+		now = c.Now()
+	}
+	left := max(deadline.Sub(now), 0)
+	shown := left.Truncate(time.Second)
+	if left%time.Second != 0 {
+		shown += time.Second
+	}
+	label := opts.Label
+	if label == "" {
+		label = msg(c, "countdown.label")
+	}
+	text := CountdownText(c, shown, opts.Format)
+	e := ui.Text(c, text).Font(theme.MonoFont).FontSize(FontSize(c, theme.H2Size)).TextColor(k.Text).FontFeatures("tnum").
+		Label(label + ", " + CountdownText(c, shown, CountdownWords))
+	r := CountdownResult{Element: e}
+	fired := ui.Local(e, "countdown-fired", func() time.Time { return time.Time{} })
+	switch {
+	case left == 0 && !fired.Equal(deadline):
+		*fired, r.finished = deadline, true
+		slog.Debug("mujica: countdown finished", "deadline", deadline)
+		c.Announce(fmt.Sprintf(msg(c, "countdown.done"), label))
+	case left > 0 && live:
+		c.After(left % time.Second)
+		if left%time.Second == 0 {
+			c.After(time.Second)
+		}
+	}
+	if left == 0 {
+		e.TextColor(k.AccentText)
+	}
+	return r
+}
+
+// CountdownText formats a non-negative duration in whole seconds.
+func CountdownText(c *ui.Context, d time.Duration, f CountdownFormat) string {
+	s := int(d / time.Second)
+	days, h, m, sec := s/86400, s%86400/3600, s%3600/60, s%60
+	if f == CountdownClock {
+		t := fmt.Sprintf("%02d:%02d:%02d", h, m, sec)
+		if days > 0 {
+			t = fmt.Sprintf(msg(c, "countdown.days_clock"), days) + " " + t
+		}
+		return t
+	}
+	out := ""
+	for i, v := range []int{days, h, m, sec} {
+		if v > 0 || i == 3 && out == "" {
+			if out != "" {
+				out += " "
+			}
+			out += fmt.Sprintf(msg(c, []string{"countdown.d", "countdown.h", "countdown.m", "countdown.s"}[i]), v)
+		}
+	}
+	return out
+}