//go:build test

package square

import (
	"context"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

// TestGetCardsOnFileHTTP_MultiPage_Combined verifies cursor-based pagination of
// the saved-cards list: multiple pages are fetched and combined into one
// result, with the cursor threaded through to each subsequent request. This
// mirrors the ListRefunds two-page test — a regression dropping the cursor loop
// would silently return only the first 25-card page for a user with more.
func TestGetCardsOnFileHTTP_MultiPage_Combined(t *testing.T) {
	var paths []string
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		paths = append(paths, r.URL.RawQuery)
		w.Header().Set("Content-Type", "application/json")
		if strings.Contains(r.URL.RawQuery, "cursor=page2") {
			_, _ = w.Write([]byte(`{"cards":[{"id":"ccof_3","card_brand":"VISA","last_4":"9999","exp_month":12,"exp_year":2030,"fingerprint":"fp3","reference_id":"user_1","enabled":true,"version":1,"created_at":"2026-07-31T00:00:00Z"}],"cursor":""}`))
			return
		}
		_, _ = w.Write([]byte(`{"cards":[{"id":"ccof_1","card_brand":"VISA","last_4":"4242","exp_month":12,"exp_year":2030,"fingerprint":"fp1","reference_id":"user_1","enabled":true,"version":1,"created_at":"2026-07-31T00:00:00Z"},{"id":"ccof_2","card_brand":"MASTERCARD","last_4":"1111","exp_month":6,"exp_year":2029,"fingerprint":"fp2","reference_id":"user_1","enabled":true,"version":1,"created_at":"2026-07-31T00:00:00Z"}],"cursor":"page2"}`))
	}))
	defer srv.Close()

	hc := &httpClient{baseURL: srv.URL, token: "t", http: srv.Client()}
	cards, err := getCardsOnFileHTTPWithClient(context.Background(), "user_1", hc)
	if err != nil {
		t.Fatalf("getCardsOnFileHTTP failed: %v", err)
	}
	if len(paths) != 2 {
		t.Fatalf("expected 2 pages fetched, got %d: %v", len(paths), paths)
	}
	if !strings.Contains(paths[0], "reference_id=user_1") {
		t.Errorf("expected reference_id filter on the first request, got %q", paths[0])
	}
	if !strings.Contains(paths[1], "cursor=page2") {
		t.Errorf("expected the cursor threaded into the second request, got %q", paths[1])
	}
	if len(cards) != 3 {
		t.Fatalf("expected 3 cards combined across pages, got %d: %+v", len(cards), cards)
	}
	// Page 1's cards must come first, page 2's appended after.
	if cards[0].CardID != "ccof_1" || cards[2].CardID != "ccof_3" {
		t.Errorf("unexpected combined card order: %+v", cards)
	}
}

// TestGetCardsOnFileHTTP_NoCards_EmptySlice verifies the empty case returns a
// non-nil empty slice (callers range over the result without a nil guard).
func TestGetCardsOnFileHTTP_NoCards_EmptySlice(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"cards":[],"cursor":""}`))
	}))
	defer srv.Close()

	hc := &httpClient{baseURL: srv.URL, token: "t", http: srv.Client()}
	cards, err := getCardsOnFileHTTPWithClient(context.Background(), "user_none", hc)
	if err != nil {
		t.Fatalf("getCardsOnFileHTTP failed: %v", err)
	}
	if cards == nil {
		t.Fatal("expected a non-nil empty slice for a user with no cards")
	}
	if len(cards) != 0 {
		t.Errorf("expected 0 cards, got %d", len(cards))
	}
}