package readings

import (
	"testing"

	"github.com/lukaszkasprzak/lectio/internal/config"
	"github.com/lukaszkasprzak/lectio/internal/i18n"
)

// The day header must carry the rank, not just name and colour: the app's
// calendar rows and the CLI's day line both display it.
func TestDayInfoCarriesRank(t *testing.T) {
	cases := []struct {
		date, lect, wantRank string
	}{
		// 2026-08-01 is the memorial of St Alphonsus Liguori in the OF.
		{"2026-08-01", "new", "memorial"},
		// 2026-12-25 is a solemnity.
		{"2026-12-25", "new", "solemnity"},
	}
	for _, c := range cases {
		cfg := config.Config{UILanguage: "en", Lectionary: c.lect, All: true}
		_, info, err := Load(cfg, Options{Date: c.date, All: true})
		if err != nil {
			t.Fatalf("%s: load: %v", c.date, err)
		}
		if info.Rank != c.wantRank {
			t.Errorf("%s: rank = %q, want %q", c.date, info.Rank, c.wantRank)
		}
	}
}

// PartIDs must list exactly the IDs the engine can emit, in display order.
// The app derives its "show readings" checkboxes from this; when it hardcoded
// them instead, seven of the nine 1962 IDs were wrong and the epistle's
// checkbox did nothing.
func TestPartIDs(t *testing.T) {
	wantNew := []string{"pierwsze_czytanie", "psalm", "drugie_czytanie", "aklamacja", "ewangelia"}
	wantOld := []string{"epistola", "evangelium"}
	if got := PartIDs("new"); !equalSlice(got, wantNew) {
		t.Errorf("PartIDs(new) = %v, want %v", got, wantNew)
	}
	if got := PartIDs("traditional"); !equalSlice(got, wantOld) {
		t.Errorf("PartIDs(traditional) = %v, want %v", got, wantOld)
	}
	if got := PartIDs("nonsense"); len(got) != 0 {
		t.Errorf("PartIDs(nonsense) = %v, want empty", got)
	}
}

// Every ID PartIDs lists must have a label in every shipped language,
// otherwise a checkbox would render a raw ID like "epistola".
func TestEveryPartIDHasLabels(t *testing.T) {
	for _, lect := range []string{"new", "traditional"} {
		for _, id := range PartIDs(lect) {
			for _, lang := range []string{"en", "pl"} {
				if i18n.Get(lang).PartLabel[id] == "" {
					t.Errorf("%s/%s: no label for %q", lect, lang, id)
				}
			}
		}
	}
}

func equalSlice(a, b []string) bool {
	if len(a) != len(b) {
		return false
	}
	for i := range a {
		if a[i] != b[i] {
			return false
		}
	}
	return true
}