package config

import (
	"os"
	"path/filepath"
	"reflect"
	"strings"
	"testing"
)

func loadYAML(t *testing.T, data string) (*Config, error) {
	t.Helper()
	dir := t.TempDir()
	t.Setenv("XDG_CONFIG_HOME", dir)
	t.Setenv("HOME", t.TempDir())
	if err := os.WriteFile(filepath.Join(dir, "netssh.yaml"), []byte(data), 0o600); err != nil {
		t.Fatal(err)
	}
	return Load()
}

func TestSSHOptionsLayering(t *testing.T) {
	cfg, err := loadYAML(t, `
netboxes:
  - name: prod
    url: https://prod.example.com
    ssh:
      proxy_jump: jh-prod.example.com
      host_key_checking: strict
  - name: staging
    url: https://staging.example.com
    ssh:
      host_key_checking: off
ssh:
  proxy_jump: jh.example.com
  extra_args: ["-4"]
  options:
    ServerAliveInterval: 60
    ServerAliveCountMax: 5
  rules:
    - match: {tag: dmz}
      proxy_jump: jh-dmz.example.com
      options: {ServerAliveInterval: 10}
    - match: {instance: prod, name: "db*"}
      proxy_jump: none
completion:
  max_results: 200
`)
	if err != nil {
		t.Fatal(err)
	}
	if cfg.Completion.MaxResults != 200 {
		t.Fatalf("max_results: %d", cfg.Completion.MaxResults)
	}
	for _, tc := range []struct {
		host              SSHHost
		jump, keys, alive string
	}{
		{SSHHost{Name: "web"}, "jh.example.com", "", "60"},
		{SSHHost{Instance: "prod", Name: "web"}, "jh-prod.example.com", "strict", "60"},
		{SSHHost{Instance: "staging", Name: "web", Tags: []string{"DMZ"}}, "jh-dmz.example.com", "off", "10"},
		{SSHHost{Instance: "prod", Name: "db01", Tags: []string{"dmz"}}, "none", "strict", "10"},
	} {
		got := cfg.SSHOptionsFor(tc.host)
		if got.ProxyJump != tc.jump || got.HostKeyChecking != tc.keys || got.Options["serveraliveinterval"] != tc.alive || got.Options["serveralivecountmax"] != "5" {
			t.Errorf("%+v: got %+v", tc.host, got)
		}
		if !reflect.DeepEqual(got.ExtraArgs, []string{"-4"}) {
			t.Errorf("extra args: %v", got.ExtraArgs)
		}
	}
}

func TestSSHOptionsValidation(t *testing.T) {
	for _, data := range []string{
		"ssh:\n  host_key_checking: maybe\n",
		"ssh:\n  target: dns\n",
		"ssh:\n  address_family: ipx\n",
		"ssh:\n  proxy_jump: \"-oProxyCommand=x\"\n",
		"ssh:\n  options:\n    \"bad key\": 1\n",
		"ssh:\n  rules:\n    - proxy_jump: jh\n",
		"netboxes:\n  - name: a\n    url: https://a.example\n    ssh:\n      target: nope\n",
	} {
		if _, err := loadYAML(t, data); err == nil {
			t.Errorf("accepted invalid config:\n%s", data)
		} else if !strings.Contains(err.Error(), "ssh") {
			t.Errorf("unclear error %v", err)
		}
	}
}

func TestForwardsLayering(t *testing.T) {
	cfg, err := loadYAML(t, `
netboxes:
  - name: prod
    url: https://prod.example
    token: t
    ssh:
      forwards:
        db: {local: "5432:localhost:5432"}
ssh:
  forwards:
    web: {local: "8080:localhost:80"}
    socks: {dynamic: "1080"}
  rules:
    - match: {tag: dmz}
      forwards:
        web: {local: "8443:localhost:443"}
`)
	if err != nil {
		t.Fatal(err)
	}
	got := cfg.SSHOptionsFor(SSHHost{Instance: "prod", Name: "web01", Tags: []string{"dmz"}}).Forwards
	want := map[string]Forward{"web": {Local: "8443:localhost:443"}, "socks": {Dynamic: "1080"}, "db": {Local: "5432:localhost:5432"}}
	if !reflect.DeepEqual(got, want) {
		t.Fatalf("got %+v", got)
	}
	if got := cfg.SSHOptionsFor(SSHHost{Instance: "other", Name: "web01"}).Forwards; len(got) != 2 || got["web"].Local != "8080:localhost:80" {
		t.Fatalf("other instance: %+v", got)
	}
	if f := (Forward{Remote: "9000:localhost:9000"}); f.String() != "-R 9000:localhost:9000" {
		t.Fatal(f.String())
	}
}

func TestForwardsValidation(t *testing.T) {
	for _, forwards := range []string{
		`web: {local: "8080:a:80", dynamic: "1080"}`,
		`web: {local: "-oProxyCommand=x"}`,
		`web: {local: "8080 a:80"}`,
		`"bad name": {local: "8080:a:80"}`,
	} {
		if _, err := loadYAML(t, "ssh:\n  forwards:\n    "+forwards+"\n"); err == nil || !strings.Contains(err.Error(), "forwards") {
			t.Errorf("%s: got %v", forwards, err)
		}
	}
}

func TestStaticHosts(t *testing.T) {
	cfg, err := loadYAML(t, `
resolver:
  hostname_domain: example.com
ssh:
  proxy_jump: jh
  rules:
    - match: {kind: static, tag: home}
      host_key_checking: off
hosts:
  - name: Router
    address: 192.168.1.1
    user: admin
    port: 2222
    tags: [home]
    ssh:
      proxy_jump: none
`)
	if err != nil {
		t.Fatal(err)
	}
	if !cfg.HasHosts() || cfg.HasNetBox() || cfg.Resolver.HostnameDomain != "example.com" {
		t.Fatalf("got %+v", cfg)
	}
	host := cfg.StaticHost("router")
	if host == nil || host.Address != "192.168.1.1" || host.User != "admin" || host.Port != 2222 {
		t.Fatalf("host: %+v", host)
	}
	opts := cfg.SSHOptionsFor(SSHHost{Name: "Router", Kind: StaticKind, Tags: []string{"home"}})
	if opts.ProxyJump != "none" || opts.HostKeyChecking != "off" {
		t.Fatalf("static host options: %+v", opts)
	}
	// A NetBox host of the same name does not get the static host's options.
	if got := cfg.SSHOptionsFor(SSHHost{Name: "Router", Kind: "device"}); got.ProxyJump != "jh" {
		t.Fatalf("netbox host: %+v", got)
	}
}

func TestStaticHostsValidation(t *testing.T) {
	for _, hosts := range []string{
		"- {name: a, address: 10.0.0.1}\n  - {name: A, address: 10.0.0.2}",
		"- {name: 'bad name', address: 10.0.0.1}",
		"- {name: prod/a, address: 10.0.0.1}",
		"- {name: a}",
		"- {name: a, address: '-oProxyCommand=x'}",
		"- {name: a, address: 10.0.0.1, port: 70000}",
		"- {name: a, address: 10.0.0.1, user: 'a b'}",
		"- {name: a, address: 10.0.0.1, ssh: {target: nope}}",
	} {
		if _, err := loadYAML(t, "hosts:\n  "+hosts+"\n"); err == nil || !strings.Contains(err.Error(), "hosts[") {
			t.Errorf("%s: got %v", hosts, err)
		}
	}
}