package server

import (
	"errors"
	"fmt"
	"testing"
	"time"

	"golang.org/x/crypto/acme"
)

func TestCooldown(t *testing.T) {
	now := time.Now()
	c := newCooldown()
	c.now = func() time.Time { return now }

	for i := 0; i < 4; i++ {
		if d := c.failure(); d != 0 {
			t.Fatalf("failure %d paused for %v, want no pause", i+1, d)
		}
	}
	if d := c.failure(); d != time.Minute {
		t.Fatalf("fifth failure pause = %v, want 1m", d)
	}
	if d := c.remaining(); d != time.Minute {
		t.Fatalf("remaining = %v, want 1m", d)
	}
	if d := c.failure(); d != 2*time.Minute {
		t.Fatalf("sixth failure pause = %v, want 2m", d)
	}
	for i := 0; i < 20; i++ {
		c.failure()
	}
	if d := c.failure(); d != time.Hour {
		t.Fatalf("pause cap = %v, want 1h", d)
	}

	now = now.Add(2 * time.Hour)
	if d := c.remaining(); d != 0 {
		t.Fatalf("remaining after expiry = %v", d)
	}
	c.success()
	if c.failures != 0 {
		t.Fatalf("success left failures = %d", c.failures)
	}
}

func TestCAFailureClassification(t *testing.T) {
	cases := []struct {
		err  error
		want bool
	}{
		{errors.New("dns: create _acme-challenge: nope"), false},
		{errors.New("acme: authorization for x is invalid"), false},
		{errors.New("acme: authorize order: context deadline exceeded"), true},
		{fmt.Errorf("acme: authorize order: %w", &acme.Error{StatusCode: 503}), true},
		{fmt.Errorf("acme: authorize order: %w", &acme.Error{StatusCode: 429}), true},
	}
	for _, c := range cases {
		if got := caFailure(c.err); got != c.want {
			t.Errorf("caFailure(%v) = %v, want %v", c.err, got, c.want)
		}
	}
}