package hsic

import (
	"net/netip"
	"net/url"
	"os"
	"path"
	"time"

	"github.com/juanfont/headscale"
	"github.com/rs/zerolog"
	"tailscale.com/tailcfg"
	"tailscale.com/types/dnstype"
)

const (
	defaultEphemeralNodeInactivityTimeout = time.Second * 30
	defaultNodeUpdateCheckInterval        = time.Second * 10
)

func DefaultConfig() headscale.Config {
	derpMap, _ := url.Parse("https://controlplane.tailscale.com/derpmap/default")

	config := headscale.Config{
		Log: headscale.LogConfig{
			Level: zerolog.TraceLevel,
		},
		ACL:                            headscale.GetACLConfig(),
		DBtype:                         "sqlite3",
		EphemeralNodeInactivityTimeout: defaultEphemeralNodeInactivityTimeout,
		NodeUpdateCheckInterval:        defaultNodeUpdateCheckInterval,
		IPPrefixes: []netip.Prefix{
			netip.MustParsePrefix("fd7a:115c:a1e0::/48"),
			netip.MustParsePrefix("100.64.0.0/10"),
		},
		DNSConfig: &tailcfg.DNSConfig{
			Proxied: true,
			Nameservers: []netip.Addr{
				netip.MustParseAddr("127.0.0.11"),
				netip.MustParseAddr("1.1.1.1"),
			},
			Resolvers: []*dnstype.Resolver{
				{
					Addr: "127.0.0.11",
				},
				{
					Addr: "1.1.1.1",
				},
			},
		},
		BaseDomain: "headscale.net",

		DBpath: "/tmp/integration_test_db.sqlite3",

		PrivateKeyPath:      "/tmp/integration_private.key",
		NoisePrivateKeyPath: "/tmp/noise_integration_private.key",
		Addr:                "0.0.0.0:8080",
		MetricsAddr:         "127.0.0.1:9090",
		ServerURL:           "http://headscale:8080",

		DERP: headscale.DERPConfig{
			URLs: []url.URL{
				*derpMap,
			},
			AutoUpdate:      false,
			UpdateFrequency: 1 * time.Minute,
		},
	}

	return config
}

// TODO: Reuse the actual configuration object above.
func DefaultConfigYAML() string {
	yaml := `
log:
  level: trace
acl_policy_path: ""
db_type: sqlite3
db_path: /tmp/integration_test_db.sqlite3
ephemeral_node_inactivity_timeout: 30m
node_update_check_interval: 10s
ip_prefixes:
  - fd7a:115c:a1e0::/48
  - 100.64.0.0/10
dns_config:
  base_domain: headscale.net
  magic_dns: true
  domains: []
  nameservers:
    - 127.0.0.11
    - 1.1.1.1
private_key_path: /tmp/private.key
noise:
  private_key_path: /tmp/noise_private.key
listen_addr: 0.0.0.0:8080
metrics_listen_addr: 127.0.0.1:9090
server_url: http://headscale:8080

derp:
  urls:
    - https://controlplane.tailscale.com/derpmap/default
  auto_update_enabled: false
  update_frequency: 1m
`

	return yaml
}

func TempConfigPath(name string, config string) (string, error) {
	tempDir, err := os.CreateTemp("", name)
	if err != nil {
		return "", err
	}

	err = os.WriteFile(path.Join(tempDir.Name(), "config.yaml"), []byte(config), 0644)
	if err != nil {
		return "", err
	}

	return tempDir.Name(), nil
}