package caldata

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

func TestBaseSanctoraleOverride(t *testing.T) {
	dir := t.TempDir()
	os.WriteFile(filepath.Join(dir, "of.ini"), []byte(
		"[layer]\nid = test-override\ntype = universal\n\n"+
			"[test-saint]\ndate = 06-15\nrank = feast\nname.en = Test Saint\n"), 0o644)
	SetSanctoraleDir(dir)
	t.Cleanup(func() { SetSanctoraleDir("") })

	// External file present and valid -> it REPLACES the embedded OF calendar.
	l := Base("new")
	if l.ID != "test-override" {
		t.Fatalf("external of.ini not used: layer id = %q", l.ID)
	}
	if _, ok := l.Cels["test-saint"]; !ok || len(l.Cels) != 1 {
		t.Fatalf("external calendar not loaded verbatim: %d cels", len(l.Cels))
	}

	// EF form has no external file here -> embedded Tridentine still used.
	if ef := Base("old"); ef.ID == "test-override" {
		t.Fatal("EF wrongly took the OF override")
	}
}

func TestBaseFallsBackToEmbedded(t *testing.T) {
	// No dir set -> embedded default.
	SetSanctoraleDir("")
	if l := Base("new"); l.ID != "universal" || len(l.Cels) < 100 {
		t.Fatalf("no-override should give the embedded calendar, got id=%q n=%d", l.ID, len(l.Cels))
	}

	// A malformed external file must not break computation -> embedded fallback.
	dir := t.TempDir()
	os.WriteFile(filepath.Join(dir, "of.ini"), []byte("[unclosed section\n"), 0o644)
	SetSanctoraleDir(dir)
	t.Cleanup(func() { SetSanctoraleDir("") })
	if l := Base("new"); l.ID != "universal" || len(l.Cels) < 100 {
		t.Fatalf("malformed override should fall back to embedded, got id=%q n=%d", l.ID, len(l.Cels))
	}
}