package notifications

import (
	"strings"
	"testing"
)

func TestBucketFor(t *testing.T) {
	cases := []struct {
		lead int
		want string
	}{
		{-1, "today"}, {0, "today"}, {1, "tomorrow"}, {2, "days"}, {7, "days"},
	}
	for _, c := range cases {
		if got := bucketFor(c.lead); got != c.want {
			t.Errorf("bucketFor(%d) = %q, want %q", c.lead, got, c.want)
		}
	}
}

func TestRender_GermanParentsToday(t *testing.T) {
	subject, body := Render("fortbildung", "parents", 0, "de", Vars{
		Title: "SCHILF", DatePretty: "10.10.2026", ClassName: "5a",
	})
	if !strings.Contains(subject, "Heute") || !strings.Contains(subject, "SCHILF") {
		t.Errorf("expected today + title in subject, got %q", subject)
	}
	if !strings.Contains(body, "Liebe Eltern") {
		t.Errorf("expected greeting in body, got %q", body)
	}
	if !strings.Contains(body, "(5a)") {
		t.Errorf("expected class suffix, got %q", body)
	}
}

func TestRender_TurkishStudentTomorrow(t *testing.T) {
	subject, _ := Render("schulfeier", "students", 1, "tr", Vars{
		Title: "Yaz şenliği", DatePretty: "12.06.2026",
	})
	if !strings.Contains(subject, "Yarın") || !strings.Contains(subject, "Yaz şenliği") {
		t.Errorf("expected Turkish 'tomorrow' subject, got %q", subject)
	}
}

func TestRender_FallbackLanguage(t *testing.T) {
	// 'xx' isn't supported → falls back to de.
	subject, _ := Render("klassenfahrt", "parents", 7, "xx", Vars{
		Title: "Wattenmeer", DatePretty: "15.05.2026", ClassName: "6b",
	})
	if !strings.Contains(subject, "In 7 Tagen") {
		t.Errorf("expected German fallback, got %q", subject)
	}
}

func TestRender_FallbackEventType(t *testing.T) {
	// 'unknown_type' falls back to 'andere'.
	subject, _ := Render("unknown_type", "parents", 0, "de", Vars{
		Title: "Sondertermin",
	})
	if !strings.Contains(subject, "Heute") || !strings.Contains(subject, "Sondertermin") {
		t.Errorf("expected today subject after fallback, got %q", subject)
	}
}

func TestSubstitute_DropsClassSuffixWhenEmpty(t *testing.T) {
	out := substitute("X{{class_suffix}}Y", 0, Vars{ClassName: ""})
	if out != "XY" {
		t.Errorf("expected XY (no suffix), got %q", out)
	}
	out = substitute("X{{class_suffix}}Y", 0, Vars{ClassName: "5a"})
	if out != "X (5a)Y" {
		t.Errorf("expected ' (5a)' suffix, got %q", out)
	}
}