package gcp

import (
	"errors"
	"fmt"
	"testing"

	"google.golang.org/api/googleapi"

	"gitea.home.hrajfrisbee.cz/kacerr/egress-proxies-operator/internal/provider"
)

func gerr(code int, reasons ...string) error {
	e := &googleapi.Error{Code: code, Message: "boom"}
	for _, r := range reasons {
		e.Errors = append(e.Errors, googleapi.ErrorItem{Reason: r})
	}
	return e
}

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

	tests := []struct {
		name string
		err  error
		want error
	}{
		{name: "404 is NotFound", err: gerr(404), want: provider.ErrNotFound},
		{name: "429 is Quota", err: gerr(429), want: provider.ErrQuotaExceeded},
		{name: "403 quotaExceeded is Quota", err: gerr(403, "quotaExceeded"), want: provider.ErrQuotaExceeded},
		{name: "403 rateLimitExceeded is Quota", err: gerr(403, "rateLimitExceeded"), want: provider.ErrQuotaExceeded},
		{name: "403 plain is Permanent", err: gerr(403, "forbidden"), want: provider.ErrPermanent},
		{name: "400 is Permanent", err: gerr(400), want: provider.ErrPermanent},
		{name: "401 is Permanent", err: gerr(401), want: provider.ErrPermanent},
		{name: "408 is Transient", err: gerr(408), want: provider.ErrTransient},
		{name: "500 is Transient", err: gerr(500), want: provider.ErrTransient},
		{name: "503 is Transient", err: gerr(503), want: provider.ErrTransient},
		{name: "409 is Transient (alreadyExists is handled before classify)", err: gerr(409), want: provider.ErrTransient},
		{name: "plain network error is Transient", err: errors.New("connection reset"), want: provider.ErrTransient},
		{name: "wrapped googleapi error still classifies", err: fmt.Errorf("calling api: %w", gerr(404)), want: provider.ErrNotFound},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			if got := classify(tc.err); got != tc.want {
				t.Errorf("classify() = %v, want %v", got, tc.want)
			}
		})
	}
}

// The wrapped error must satisfy both halves of the taxonomy contract:
// errors.Is against the sentinel AND errors.As back to the SDK error.
func TestWrapErr_isAndAsBothWork(t *testing.T) {
	t.Parallel()
	p := &Provider{name: "gcp-eu"}
	wrapped := p.wrapErr("get", "zones/z/instances/i", gerr(404))

	if !errors.Is(wrapped, provider.ErrNotFound) {
		t.Error("errors.Is(wrapped, ErrNotFound) = false")
	}
	var ge *googleapi.Error
	if !errors.As(wrapped, &ge) || ge.Code != 404 {
		t.Error("errors.As back to *googleapi.Error failed")
	}
	if provider.Class(wrapped) != provider.ErrNotFound {
		t.Errorf("Class() = %v, want ErrNotFound", provider.Class(wrapped))
	}
}