package main

import (
	"os"
	"strings"
	"path/filepath"
	"testing"
	"time"
)

func TestFitnessWeights(t *testing.T) {
	withBerlin(t)
	dir := t.TempDir()
	prev := calendarsDir
	calendarsDir = dir
	t.Cleanup(func() { calendarsDir = prev })

	if err := os.WriteFile(filepath.Join(dir, ".page-settings"),
		[]byte("type = calendars\nweight = Gewicht\n"), 0644); err != nil {
		t.Fatal(err)
	}
	writeCal(t, dir, "Gewicht",
		`UID:1
		SUMMARY:96 kg
		DTSTART;VALUE=DATE:20261001`,
		`UID:2
		SUMMARY:95,6kg
		DTSTART;VALUE=DATE:20261003`,
		`UID:3
		SUMMARY:not a weight
		DTSTART;VALUE=DATE:20261004`,
		`UID:4
		SUMMARY:90 kg
		DTSTART;VALUE=DATE:20261010`,
	)

	today := time.Date(2026, 10, 5, 0, 0, 0, 0, time.UTC)
	got := fitnessWeights(today)
	want := []weightPoint{
		{date: time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC), value: 96},
		{date: time.Date(2026, 10, 3, 0, 0, 0, 0, time.UTC), value: 95.6},
	}
	if len(got) != len(want) {
		t.Fatalf("got %+v, want %+v", got, want)
	}
	for i := range want {
		if !got[i].date.Equal(want[i].date) || got[i].value != want[i].value {
			t.Fatalf("point %d: got %+v, want %+v", i, got[i], want[i])
		}
	}
}

func TestTimeXTicks(t *testing.T) {
	d := func(y int, m time.Month, day int) time.Time { return time.Date(y, m, day, 0, 0, 0, 0, time.UTC) }
	for _, c := range []struct {
		from, to time.Time
		want     string
	}{
		{d(2022, 11, 28), d(2026, 9, 21), "2023 2024 2025 2026"},
		{d(2025, 9, 27), d(2026, 9, 27), "Oct 2025|Jan 2026|Apr|Jul"},
		{d(2026, 6, 27), d(2026, 9, 27), "Jul 2026|Aug|Sep"},
		{d(2026, 8, 27), d(2026, 9, 27), "31 Aug|7 Sep|14 Sep|21 Sep"},
	} {
		var got []string
		for _, tk := range timeXTicks(chartScale{x0: c.from, x1: c.to}) {
			got = append(got, tk.Label)
		}
		sep := " "
		if strings.Contains(c.want, "|") {
			sep = "|"
		}
		if g := strings.Join(got, sep); g != c.want {
			t.Errorf("%s..%s: got %q, want %q", c.from.Format("2006-01-02"), c.to.Format("2006-01-02"), g, c.want)
		}
	}
}