package main

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"git.zb-server.de/Sebi/ssh-netbox-wrapper/internal/config"
)

// prepareConfig writes data as the only config, with empty cache and home.
func prepareConfig(t *testing.T, data string) string {
	t.Helper()
	dir := t.TempDir()
	t.Setenv("HOME", t.TempDir())
	t.Setenv("XDG_CONFIG_HOME", dir)
	t.Setenv("XDG_CACHE_HOME", t.TempDir())
	t.Setenv("NETSSH_NETBOX_URL", "")
	t.Setenv("NETSSH_NETBOX_TOKEN", "")
	t.Setenv("NETSSH_CACHE_PATH", filepath.Join(t.TempDir(), "hosts.json"))
	t.Setenv("NETSSH_SHELL_ALIAS", "")
	path := filepath.Join(dir, "netssh.yaml")
	if err := os.WriteFile(path, []byte(data), 0o600); err != nil {
		t.Fatal(err)
	}
	return path
}

const staticOnlyConfig = `ssh:
  default_user: ops
  rules:
    - match: {kind: static, tag: home}
      host_key_checking: accept-new
shortcuts:
  domains: [.lan]
hosts:
  - name: router.lan
    address: 192.168.1.1
    user: admin
    port: 2222
    tags: [home]
  - name: nas
    address: nas.example.org
    ssh:
      proxy_jump: jh.example.com
`

// Static hosts work without any NetBox and with their own user, port, tags, and options.
func TestStaticHostsWithoutNetBox(t *testing.T) {
	prepareConfig(t, staticOnlyConfig)
	for _, tc := range []struct {
		args []string
		want string
	}{
		{[]string{"--dry-run", "router.lan"}, "ssh -p 2222 -l admin -o StrictHostKeyChecking=accept-new 192.168.1.1"},
		{[]string{"--dry-run", "router"}, "ssh -p 2222 -l admin -o StrictHostKeyChecking=accept-new 192.168.1.1"}, // shortcut
		{[]string{"--dry-run", "-l", "root", "nas", "uptime"}, "ssh -l root -J jh.example.com nas.example.org uptime"},
		{[]string{"sftp", "--dry-run", "router:/etc"}, "sftp -P 2222 -o User=admin -o StrictHostKeyChecking=accept-new 192.168.1.1:/etc"},
		{[]string{"scp", "--dry-run", "a.txt", "nas:/tmp/"}, "scp -o User=ops -J jh.example.com a.txt nas.example.org:/tmp/"},
	} {
		out, err := runNetssh(t, tc.args...)
		if err != nil || out != tc.want {
			t.Errorf("%v:\n got  %s (%v)\n want %s", tc.args, out, err, tc.want)
		}
	}
	if out, err := runNetssh(t, "--dry-run", "unknown"); err == nil || !strings.Contains(out, "no NetBox is configured") {
		t.Errorf("unknown host: %s (%v)", out, err)
	}
	if out, _ := runNetssh(t, "__complete", "rou"); !strings.HasPrefix(out, "router.lan\n") {
		t.Errorf("completion: %q", out)
	}
	if out, _ := runNetssh(t, "alias", "--shell", "bash"); !strings.Contains(out, "alias router='netssh router.lan'") || !strings.Contains(out, "alias nas='netssh nas'") {
		t.Errorf("aliases: %s", out)
	}
}

func TestHostsCommand(t *testing.T) {
	path := prepareConfig(t, "hosts:\n  - {name: nas, address: nas.example.org, ssh: {proxy_jump: jh}}\n")
	steps := []struct {
		args    []string
		wantErr string
	}{
		{[]string{"hosts", "add", "router", "192.168.1.1", "--user", "admin", "--port", "2222", "--tag", "home", "--tag", "lab"}, ""},
		{[]string{"hosts", "add", "router", "10.0.0.1"}, "already exists"},
		{[]string{"hosts", "add", "nas", "10.0.0.5", "--replace"}, ""},
		{[]string{"hosts", "add", "bad name", "10.0.0.1"}, "must start with"},
		{[]string{"hosts", "remove", "missing"}, "no static host"},
	}
	for _, step := range steps {
		out, err := runNetssh(t, step.args...)
		if step.wantErr == "" && err != nil || step.wantErr != "" && !strings.Contains(out, step.wantErr) {
			t.Fatalf("%v: %s (%v)", step.args, out, err)
		}
	}
	cfg, err := config.Load()
	if err != nil {
		t.Fatal(err)
	}
	router, nas := cfg.StaticHost("router"), cfg.StaticHost("nas")
	if router == nil || router.User != "admin" || router.Port != 2222 || strings.Join(router.Tags, ",") != "home,lab" {
		t.Fatalf("router: %+v", router)
	}
	if nas == nil || nas.Address != "10.0.0.5" || nas.SSH.ProxyJump != "jh" {
		t.Fatalf("--replace must keep SSH options: %+v", nas)
	}
	out, err := runNetssh(t, "hosts", "list")
	if err != nil || !strings.Contains(out, "router  192.168.1.1  admin  2222  home,lab") {
		t.Fatalf("list:\n%s (%v)", out, err)
	}
	if out, err := runNetssh(t, "hosts", "rm", "router"); err != nil {
		t.Fatalf("remove: %s (%v)", out, err)
	}
	data, _ := os.ReadFile(path)
	if strings.Contains(string(data), "router") || strings.Contains(string(data), "netbox:") {
		t.Fatalf("config after remove:\n%s", data)
	}
}

// The hostname strategy passes the NetBox name (plus domain) instead of an IP.
func TestHostnameStrategyConnects(t *testing.T) {
	srv := connectionTestServer(t, []connectionTestHost{{ID: 1, Name: "web01"}, multiHost("db01", "10.0.0.7")}, nil)
	prepareConfig(t, fmt.Sprintf("netbox:\n  url: %q\n  token: t\nresolver:\n  strategies: [primary_ip, hostname]\n  hostname_domain: example.com\n", srv.URL))
	for host, want := range map[string]string{"web01": "ssh web01.example.com", "db01": "ssh 10.0.0.7"} {
		if out, err := runNetssh(t, "--dry-run", host); err != nil || out != want {
			t.Errorf("%s: got %s (%v), want %s", host, out, err, want)
		}
	}
}