package eventcatalog

import (
	"testing"
	"time"
)

func TestResolveBlackFridayUsesRecurrenceRule(t *testing.T) {
	t.Parallel()

	got, err := ResolveRecurrence(RecurrenceBlackFriday, 2026, time.UTC)
	if err != nil {
		t.Fatal(err)
	}
	if want := "2026-11-27"; got.Format(time.DateOnly) != want {
		t.Fatalf("Black Friday = %s, want %s", got.Format(time.DateOnly), want)
	}
}

func TestValidateEventsDistinguishesCelebrationAndMourning(t *testing.T) {
	t.Parallel()

	events := []Event{
		{ID: "nowruz-1405", OccasionKey: "nowruz", TitleFA: "نوروز", StartDate: "2026-03-21", EndDate: "2026-03-24", Type: TypeCultural, Tone: ToneCelebratory, CommercialPosture: PosturePromote, SourceURI: "https://calendar.ut.ac.ir/", SourceVersion: "1405", InclusionRationale: "تقویم رسمی", GeographicScope: "IR", RelevanceBPS: 10000, ConfidenceBPS: 10000},
		{ID: "ashura-1405", OccasionKey: "ashura", TitleFA: "عاشورای حسینی", StartDate: "2026-06-25", EndDate: "2026-06-25", Type: TypeReligious, Tone: ToneMourning, CommercialPosture: PostureNoPromotion, SourceURI: "https://calendar.ut.ac.ir/", SourceVersion: "1405", InclusionRationale: "تقویم رسمی", GeographicScope: "IR", RelevanceBPS: 10000, ConfidenceBPS: 10000},
	}
	if err := ValidateEvents(events); err != nil {
		t.Fatal(err)
	}
}

func TestValidateEventsRejectsPromotionalMourningEvent(t *testing.T) {
	t.Parallel()

	event := Event{ID: "mourning", OccasionKey: "mourning", TitleFA: "یادبود", StartDate: "2026-01-01", EndDate: "2026-01-01", Type: TypeCultural, Tone: ToneMourning, CommercialPosture: PosturePromote, SourceURI: "https://example.test", SourceVersion: "v1", InclusionRationale: "reviewed", GeographicScope: "IR", RelevanceBPS: 10000, ConfidenceBPS: 10000}
	if err := ValidateEvents([]Event{event}); err == nil {
		t.Fatal("expected mourning promotion validation error")
	}
}

func TestValidateEventsRejectsYearSpecificOccasionKey(t *testing.T) {
	t.Parallel()

	event := validCatalogEvent("black-friday-2026", "2026-11-27", 1405)
	event.OccasionKey = "black-friday-2026"
	event.Recurrence = RecurrenceBlackFriday
	if err := ValidateEvents([]Event{event}); err == nil {
		t.Fatal("expected year-specific occasion key validation error")
	}
}

func TestValidateEventsRejectsNonCanonicalOccasionKey(t *testing.T) {
	t.Parallel()

	event := validCatalogEvent("black-friday-2026", "2026-11-27", 1405)
	event.OccasionKey = "Black_Friday_2026a"
	if err := ValidateEvents([]Event{event}); err == nil {
		t.Fatal("expected non-canonical occasion key validation error")
	}
}

func TestValidateEventsRejectsDuplicateOccasionVariantInJalaliYear(t *testing.T) {
	t.Parallel()

	first := validCatalogEvent("yalda-first-1405", "2026-12-12", 1405)
	first.OccasionKey = "yalda"
	first.Variant = "CAMPAIGN_WINDOW"
	second := validCatalogEvent("yalda-second-1405", "2026-12-18", 1405)
	second.OccasionKey = first.OccasionKey
	second.Variant = first.Variant
	if err := ValidateEvents([]Event{first, second}); err == nil {
		t.Fatal("expected duplicate occasion variant validation error")
	}
}

func TestValidateDeclaredCoverageUsesActualJalaliYear(t *testing.T) {
	t.Parallel()

	event := validCatalogEvent("eid-al-fitr-1406", "2027-03-10", 1406)
	event.OccasionKey = "eid-al-fitr"
	event.Variant = "OPERATIONAL_WINDOW"
	if err := ValidateDeclaredCoverage([]Event{event}, 1406, 1406); err == nil {
		t.Fatal("expected Gregorian date in Jalali 1405 to be rejected as 1406")
	}
}

func TestValidateDeclaredCoverageAllowsPreparationWindowEndingBeforeOccasionYear(t *testing.T) {
	t.Parallel()

	event := validCatalogEvent("nowruz-demand-window-1405", "2026-02-20", 1405)
	event.OccasionKey = "nowruz"
	event.Variant = "CAMPAIGN_WINDOW"
	event.EndDate = "2026-03-20"
	if err := ValidateDeclaredCoverage([]Event{event}, 1405, 1405); err != nil {
		t.Fatal(err)
	}
}

func validCatalogEvent(id, date string, jalaliYear int) Event {
	return Event{
		ID: id, OccasionKey: "black-friday", Variant: "PRIMARY", JalaliYear: jalaliYear,
		TitleFA: "رویداد", StartDate: date, EndDate: date, Type: TypeCommercial,
		Tone: ToneNeutral, CommercialPosture: PostureCaution, SourceURI: "https://example.test/event",
		SourceVersion: "reviewed", InclusionRationale: "reviewed", GeographicScope: "IR",
		RelevanceBPS: 8000, ConfidenceBPS: 8000,
	}
}