package eventcatalog

import (
	"encoding/json"
	"os"
	"strings"
	"testing"
	"time"
)

func TestImpactfulBusinessCatalogIsValidAndIndustryPersonalized(t *testing.T) {
	data, err := os.ReadFile("../../catalogs/impactful-business-events-1405-v2.json")
	if err != nil {
		t.Fatal(err)
	}
	var input Import
	if err := json.Unmarshal(data, &input); err != nil {
		t.Fatal(err)
	}
	if err := ValidateImport(input, 1405); err != nil {
		t.Fatal(err)
	}
	hasEducation, hasRetail := false, false
	months := make(map[time.Month]bool)
	for _, event := range input.Events {
		if event.OfficialHoliday && event.RelevanceBPS < 7000 {
			t.Fatalf("official holiday %s lacks evidenced business impact", event.ID)
		}
		for _, category := range event.MerchantCategories {
			hasEducation = hasEducation || category == "مراکز آموزشی مجازی"
			hasRetail = hasRetail || category == "کیف و کفش فروشی"
		}
		start, err := time.Parse(time.DateOnly, event.StartDate)
		if err != nil {
			t.Fatal(err)
		}
		months[start.Month()] = true
	}
	if !hasEducation || !hasRetail {
		t.Fatal("catalog must include both education- and retail-specific windows")
	}
	if len(input.Events) < 12 || len(months) < 9 {
		t.Fatalf("catalog must provide year-round candidate coverage; got %d events across %d months", len(input.Events), len(months))
	}
}

func TestImpactfulBusinessCatalogLinksExactHistoricalOccurrences(t *testing.T) {
	data, err := os.ReadFile("../../catalogs/impactful-business-events-1405-v2.json")
	if err != nil {
		t.Fatal(err)
	}
	var input Import
	if err := json.Unmarshal(data, &input); err != nil {
		t.Fatal(err)
	}

	required := []struct {
		occasionKey string
		variant     string
	}{
		{"education-enrollment", "CAMPAIGN_WINDOW"},
		{"black-friday", "PRIMARY"},
		{"cyber-monday", "PRIMARY"},
		{"yalda", "CAMPAIGN_WINDOW"},
		{"nowruz", "CAMPAIGN_WINDOW"},
		{"nowruz", "OPERATIONAL_WINDOW"},
	}
	for _, identity := range required {
		years := make(map[int]bool)
		for _, event := range input.Events {
			if event.OccasionKey == identity.occasionKey && event.Variant == identity.variant {
				years[event.JalaliYear] = true
			}
		}
		for year := 1402; year <= 1405; year++ {
			if !years[year] {
				t.Errorf("%s/%s lacks occurrence for %d", identity.occasionKey, identity.variant, year)
			}
		}
	}
}

func TestImpactfulBusinessCatalogDoesNotMislabelGregorian2027AsJalali1406(t *testing.T) {
	data, err := os.ReadFile("../../catalogs/impactful-business-events-1405-v2.json")
	if err != nil {
		t.Fatal(err)
	}
	var input Import
	if err := json.Unmarshal(data, &input); err != nil {
		t.Fatal(err)
	}
	for _, event := range input.Events {
		if (event.OccasionKey == "ramadan" || event.OccasionKey == "eid-al-fitr") && event.JalaliYear == 1406 {
			t.Errorf("%s is before Nowruz 1406 and must not be labeled as Jalali 1406", event.ID)
		}
	}
}

func TestImpactfulBusinessCatalogAttributesCustomWindowsToInternalPolicy(t *testing.T) {
	data, err := os.ReadFile("../../catalogs/impactful-business-events-1405-v2.json")
	if err != nil {
		t.Fatal(err)
	}
	var input Import
	if err := json.Unmarshal(data, &input); err != nil {
		t.Fatal(err)
	}
	customWindows := map[string]bool{
		"education-enrollment": true,
		"yalda":                true,
		"nowruz":               true,
		"ramadan":              true,
	}
	for _, event := range input.Events {
		if event.Variant == "CAMPAIGN_WINDOW" && customWindows[event.OccasionKey] && !strings.HasPrefix(event.SourceURI, "urn:zarinpal:event-window-policy:") {
			t.Errorf("%s custom window must cite the internal derivation policy, got %q", event.ID, event.SourceURI)
		}
	}
}