package shopify

import (
	"encoding/json"
	"errors"
	"fmt"
	"testing"
	"time"

	"github.com/google/uuid"
)

func TestNormalizeShopDomainNameOnly(t *testing.T) {
	got, err := NormalizeShopDomain("My-Store")
	if err != nil {
		t.Fatal(err)
	}
	if got != "my-store.myshopify.com" {
		t.Fatalf("got %q", got)
	}
}

func TestNormalizeShopDomainFullHost(t *testing.T) {
	got, err := NormalizeShopDomain("https://demo-shop.myshopify.com/admin")
	if err != nil {
		t.Fatal(err)
	}
	if got != "demo-shop.myshopify.com" {
		t.Fatalf("got %q", got)
	}
}

func TestNormalizeShopDomainRejectsCustomDomain(t *testing.T) {
	_, err := NormalizeShopDomain("https://shop.example.com")
	if err == nil {
		t.Fatal("expected error")
	}
}

func TestNormalizeShopDomainRejectsIP(t *testing.T) {
	_, err := NormalizeShopDomain("192.168.1.10")
	if !errors.Is(err, ErrBlockedShopDomain) && !errors.Is(err, ErrInvalidShopDomain) {
		t.Fatalf("expected blocked/invalid, got %v", err)
	}
}

func TestNormalizeShopDomainRejectsLocalhost(t *testing.T) {
	_, err := NormalizeShopDomain("localhost")
	if !errors.Is(err, ErrBlockedShopDomain) {
		t.Fatalf("expected blocked, got %v", err)
	}
}

func TestGuardAdminURL(t *testing.T) {
	if err := GuardAdminURL("https://demo.myshopify.com/admin/api/2024-10/shop.json", "demo.myshopify.com"); err != nil {
		t.Fatal(err)
	}
	if err := GuardAdminURL("http://demo.myshopify.com/admin/api/2024-10/shop.json", "demo.myshopify.com"); err == nil {
		t.Fatal("expected http blocked")
	}
	if err := GuardAdminURL("https://evil.example.com/admin/api/2024-10/shop.json", "demo.myshopify.com"); err == nil {
		t.Fatal("expected host mismatch blocked")
	}
}

func TestEncryptDecryptRoundTrip(t *testing.T) {
	t.Setenv("APP_ENV", "development")
	key := DeriveKey("test-passphrase", "fallback")
	enc, err := EncryptSecret(key, "shpat_test_token")
	if err != nil {
		t.Fatal(err)
	}
	if enc == "shpat_test_token" {
		t.Fatal("expected ciphertext")
	}
	plain, err := DecryptSecret(key, enc)
	if err != nil {
		t.Fatal(err)
	}
	if plain != "shpat_test_token" {
		t.Fatalf("got %q", plain)
	}
}

func TestParseSyncOptionsClampsLimits(t *testing.T) {
	raw := []byte(`{"sync_limit":99999,"batch_size":500,"orders_sync_limit":99999,"schedule_interval_hours":999}`)
	opt := parseSyncOptions(raw)
	if opt.SyncLimit != defaultSyncLimit {
		t.Fatalf("sync_limit=%d", opt.SyncLimit)
	}
	if opt.BatchSize != defaultBatchSize {
		t.Fatalf("batch_size=%d", opt.BatchSize)
	}
	if opt.OrdersSyncLimit != 0 {
		t.Fatalf("orders_sync_limit=%d", opt.OrdersSyncLimit)
	}
	if opt.ScheduleIntervalHours != 0 {
		t.Fatalf("schedule_interval_hours=%d", opt.ScheduleIntervalHours)
	}
}

func TestParseSyncOptionsPrunesProductIDs(t *testing.T) {
	ids := make(map[string]int64, maxProductIDMap+50)
	for i := 0; i < maxProductIDMap+50; i++ {
		ids[fmt.Sprintf("sku-%d", i)] = int64(i + 1)
	}
	raw, err := json.Marshal(map[string]any{"product_ids": ids})
	if err != nil {
		t.Fatal(err)
	}
	opt := parseSyncOptions(raw)
	if len(opt.ProductIDs) != maxProductIDMap {
		t.Fatalf("product_ids len=%d want %d", len(opt.ProductIDs), maxProductIDMap)
	}
}

func TestParseSyncOptionsScheduleAndFilterParams(t *testing.T) {
	raw := []byte(`{"schedule_interval_hours":24,"match_strategy":"barcode","product_ids":{"SKU-1":11}}`)
	opt := parseSyncOptions(raw)
	if opt.ScheduleIntervalHours != 24 {
		t.Fatalf("schedule_interval_hours=%d want 24", opt.ScheduleIntervalHours)
	}
	if opt.MatchStrategy != "barcode" {
		t.Fatalf("match_strategy=%q", opt.MatchStrategy)
	}
	if opt.ProductIDs["SKU-1"] != 11 {
		t.Fatalf("product_ids=%v", opt.ProductIDs)
	}

	maxRaw := []byte(fmt.Sprintf(`{"schedule_interval_hours":%d}`, maxScheduleIntervalH))
	if got := parseSyncOptions(maxRaw).ScheduleIntervalHours; got != maxScheduleIntervalH {
		t.Fatalf("max schedule kept=%d want %d", got, maxScheduleIntervalH)
	}
	neg := parseSyncOptions([]byte(`{"schedule_interval_hours":-3,"match_strategy":""}`))
	if neg.ScheduleIntervalHours != 0 {
		t.Fatalf("negative schedule=%d", neg.ScheduleIntervalHours)
	}
	if neg.MatchStrategy != "sku" {
		t.Fatalf("empty match_strategy default=%q", neg.MatchStrategy)
	}
}

func TestResolveScheduleIntervalAndDue(t *testing.T) {
	if got := resolveScheduleInterval(0, 0); got != 6*time.Hour {
		t.Fatalf("default interval=%s", got)
	}
	if got := resolveScheduleInterval(12, time.Hour); got != 12*time.Hour {
		t.Fatalf("custom interval=%s", got)
	}
	now := time.Date(2026, 8, 9, 12, 0, 0, 0, time.UTC)
	if !isDueForSchedule(nil, now, time.Hour) {
		t.Fatal("nil last should be due")
	}
	recent := now.Add(-30 * time.Minute)
	if isDueForSchedule(&recent, now, time.Hour) {
		t.Fatal("recent sync should not be due")
	}
	stale := now.Add(-2 * time.Hour)
	if !isDueForSchedule(&stale, now, time.Hour) {
		t.Fatal("stale sync should be due")
	}
}

func TestUpdateScheduleRejectsInvalidInterval(t *testing.T) {
	t.Parallel()
	s := &Service{} // Pool nil — validation must fail before any DB I/O
	cid := uuid.MustParse("11111111-1111-1111-1111-111111111111")
	_, err := s.UpdateSchedule(t.Context(), cid, -1, false)
	if !errors.Is(err, ErrInvalidScheduleInterval) {
		t.Fatalf("negative hours: err=%v", err)
	}
	_, err = s.UpdateSchedule(t.Context(), cid, maxScheduleIntervalH+1, false)
	if !errors.Is(err, ErrInvalidScheduleInterval) {
		t.Fatalf("over-max hours: err=%v", err)
	}
	msg, ok := ClientError(ErrInvalidScheduleInterval)
	if !ok || msg == "" {
		t.Fatalf("ClientError mapping missing for ErrInvalidScheduleInterval")
	}
}

func TestShouldEnqueueScheduledPaused(t *testing.T) {
	now := time.Date(2026, 8, 9, 12, 0, 0, 0, time.UTC)
	if shouldEnqueueScheduled(true, 6, nil, now, 6*time.Hour) {
		t.Fatal("paused schedule must not enqueue")
	}
	if !shouldEnqueueScheduled(false, 6, nil, now, 6*time.Hour) {
		t.Fatal("unpaused with nil last should enqueue")
	}
	recent := now.Add(-30 * time.Minute)
	if shouldEnqueueScheduled(false, 6, &recent, now, 6*time.Hour) {
		t.Fatal("recent sync within interval must not enqueue")
	}
	opt := parseSyncOptions([]byte(`{"schedule_interval_hours":12,"schedule_paused":true}`))
	if !opt.SchedulePaused || opt.ScheduleIntervalHours != 12 {
		t.Fatalf("parse paused=%v hours=%d", opt.SchedulePaused, opt.ScheduleIntervalHours)
	}
}

func TestNormalizeOrderListFilter(t *testing.T) {
	got := normalizeOrderListFilter(OrderListFilter{Limit: 0, Offset: -5})
	if got.Limit != 50 || got.Offset != 0 {
		t.Fatalf("defaults got limit=%d offset=%d", got.Limit, got.Offset)
	}
	got = normalizeOrderListFilter(OrderListFilter{Limit: 500, Offset: 10})
	if got.Limit != 50 || got.Offset != 10 {
		t.Fatalf("over-max clamp got limit=%d offset=%d", got.Limit, got.Offset)
	}
	got = normalizeOrderListFilter(OrderListFilter{Limit: 25, Offset: 3, Status: "paid", Email: "a@b.c"})
	if got.Limit != 25 || got.Offset != 3 || got.Status != "paid" || got.Email != "a@b.c" {
		t.Fatalf("preserve got %+v", got)
	}
}

func TestPruneStringInt64Map(t *testing.T) {
	m := map[string]int64{"a": 1, "b": 2, "c": 3}
	pruneStringInt64Map(m, 2)
	if len(m) != 2 {
		t.Fatalf("len=%d want 2", len(m))
	}
	pruneStringInt64Map(m, 10)
	if len(m) != 2 {
		t.Fatalf("no-op prune changed len=%d", len(m))
	}
}

func TestNormalizeAPIVersion(t *testing.T) {
	if got := normalizeAPIVersion("2024-10"); got != "2024-10" {
		t.Fatalf("got %q", got)
	}
	if got := normalizeAPIVersion("../evil"); got != defaultAPIVersion {
		t.Fatalf("expected default, got %q", got)
	}
	if got := normalizeAPIVersion(""); got != defaultAPIVersion {
		t.Fatalf("expected default, got %q", got)
	}
}

func TestShopifySKUSearchQuery(t *testing.T) {
	got := shopifySKUSearchQuery(`ABC" OR sku:evil`)
	want := `sku:"ABC\" OR sku:evil"`
	if got != want {
		t.Fatalf("got %q want %q", got, want)
	}
}

func TestDryRunClient(t *testing.T) {
	c := NewClient("demo.myshopify.com", "dry-run", "2024-10", nil)
	if !c.DryRun {
		t.Fatal("expected dry-run")
	}
	shop, err := c.TestConnection(t.Context())
	if err != nil {
		t.Fatal(err)
	}
	if shop == nil || shop.Name == "" {
		t.Fatal("expected shop info")
	}
	p, err := c.CreateProduct(t.Context(), ProductPayload{Title: "Test"})
	if err != nil {
		t.Fatal(err)
	}
	if p.ID <= 0 {
		t.Fatalf("expected dry product id, got %d", p.ID)
	}
	orders, next, err := c.ListOrdersPage(t.Context(), "", 10)
	if err != nil {
		t.Fatal(err)
	}
	if len(orders) != 1 || next != "" {
		t.Fatalf("unexpected orders=%d next=%q", len(orders), next)
	}
}