package calendar_test

// Reproduction tests for three named EF precedence defects (colitur's
// differential/oracle audit against lectio's ~66-line EF precedence
// approximation, internal/calendar/precedence_ef.go). Each test fails before
// its fix and passes after -- see the report for the exact pre-fix failure
// message. These exercise the REAL tridentine sanctoral data
// (caldata.Tridentine()) through the public Compute entry point, since the
// bugs are about how real fixed-date feasts interact with the temporal
// calendar, not about precedenceEF's arithmetic in isolation (that is
// covered separately, package-internal, in precedence_ef_test.go).

import (
	"testing"
	"time"

	"github.com/lukaszkasprzak/lectio/internal/caldata"
	"github.com/lukaszkasprzak/lectio/internal/calendar"
)

func efCompute(date string) calendar.LiturgicalDay {
	sel := calendar.DefaultSelection()
	sel.Form = "old"
	d, _ := time.Parse("2006-01-02", date)
	return calendar.Compute(d.UTC(), sel, []calendar.Layer{caldata.Tridentine()})
}

// TestJosephYieldsToSundayOfLent: RG 91 entry 6 (Sundays of Lent, I class)
// vs entry 11 (I-class feasts of the universal Church not above) -- the
// Sunday holds; St Joseph (19 March) transfers to the next free day (RG 95,
// RG 96), landing on the 20th. Before the fix (defect 4: Sunday ranks), Lent
// Sundays were wrongly II class, so Joseph (I class) won outright every time
// this collision occurred.
func TestJosephYieldsToSundayOfLent(t *testing.T) {
	for _, year := range []string{"2006", "2017", "2023", "2028", "2034", "2045"} {
		sunday := efCompute(year + "-03-19")
		if sunday.Observed.Slug == "joseph-spouse-of-the-bl-virgin-mary" {
			t.Errorf("%s-03-19 observed = %q want the Lent Sunday (RG 91 entry 6 beats entry 11)", year, sunday.Observed.Slug)
		}
		next := efCompute(year + "-03-20")
		if next.Observed.Slug != "joseph-spouse-of-the-bl-virgin-mary" {
			t.Errorf("%s-03-20 observed = %q want joseph-spouse-of-the-bl-virgin-mary (transferred one day, RG 96)", year, next.Observed.Slug)
		}
	}
}