package main

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

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

// TestNetsshHelper runs main() with the arguments in NETSSH_TEST_ARGS.
func TestNetsshHelper(t *testing.T) {
	if args := os.Getenv("NETSSH_TEST_ARGS"); args != "" {
		os.Args = append([]string{"netssh"}, strings.Split(args, "\x1f")...)
		main()
		os.Exit(0)
	}
}

// prepareTransferTest writes a config whose only host is cached; NetBox is
// unreachable, so every result must come from cache, shortcuts, and options.
func prepareTransferTest(t *testing.T) {
	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", "")
	data := `netbox:
  url: http://127.0.0.1:1
  token: t
ssh:
  default_user: ops
  default_port: 2222
  extra_args: ["-A"]
  forwards:
    web: {local: "8080:localhost:80"}
  rules:
    - match: {tag: dmz}
      proxy_jump: jh.example.com
      forwards:
        socks: {dynamic: "1080"}
shortcuts:
  domains: [.hoster.de]
  rewrites:
    - pattern: '^([a-z]+)[0-9]+-'
      replace: '$1'
`
	if err := os.WriteFile(filepath.Join(dir, "netssh.yaml"), []byte(data), 0o600); err != nil {
		t.Fatal(err)
	}
	cfg, err := config.Load()
	if err != nil {
		t.Fatal(err)
	}
	c := cache.New(cfg.CachePath(), 3600)
	c.Upsert(cache.Entry{Name: "fsn1-bx1.hoster.de", IP: "10.0.0.9", Kind: "device", Tags: []string{"dmz"}})
	if err := c.Save(); err != nil {
		t.Fatal(err)
	}
}

func runNetssh(t *testing.T, args ...string) (string, error) {
	t.Helper()
	cmd := exec.Command(os.Args[0], "-test.run=^TestNetsshHelper$")
	cmd.Env = append(os.Environ(), "NETSSH_TEST_ARGS="+strings.Join(args, "\x1f"))
	out, err := cmd.CombinedOutput()
	return strings.TrimSpace(string(out)), err
}

func TestTransferAndTunnelCommands(t *testing.T) {
	prepareTransferTest(t)
	for _, tc := range []struct {
		args []string
		want string
	}{
		// sftp: -P and -o User, rule jump host, path kept, no ssh-only extra_args.
		{[]string{"sftp", "--dry-run", "fsnbx1:/var/log"}, "sftp -P 2222 -o User=ops -J jh.example.com 10.0.0.9:/var/log"},
		{[]string{"sftp", "--dry-run", "-P", "22", "root@fsnbx1"}, "sftp -P 22 -J jh.example.com root@10.0.0.9"},
		{[]string{"scp", "--dry-run", "-r", "a.txt", "fsn1-bx1.hoster.de:/tmp/"}, "scp -P 2222 -o User=ops -r -J jh.example.com a.txt 10.0.0.9:/tmp/"},
		{[]string{"scp", "--dry-run", "--no-jump", "fsnbx1:/etc/hosts", "."}, "scp -P 2222 -o User=ops -o ProxyJump=none 10.0.0.9:/etc/hosts ."},
		// Forwards come from the global options and the matching rule.
		{[]string{"tunnel", "--dry-run", "fsnbx1", "web", "socks", "5432:db:5432"}, "ssh -A -p 2222 -l ops -J jh.example.com -L 8080:localhost:80 -D 1080 -L 5432:db:5432 -o ExitOnForwardFailure=yes -N 10.0.0.9"},
		{[]string{"--dry-run", "--forward", "web", "fsnbx1"}, "ssh -A -p 2222 -l ops -J jh.example.com -L 8080:localhost:80 10.0.0.9"},
	} {
		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)
		}
	}
	for _, tc := range []struct {
		args []string
		want string
	}{
		{[]string{"tunnel", "--dry-run", "fsnbx1"}, "forwards for fsn1-bx1.hoster.de: socks, web"},
		{[]string{"tunnel", "--dry-run", "fsnbx1", "db"}, `unknown forward "db"; available: socks, web`},
		{[]string{"sftp", "--forward", "web", "fsnbx1"}, "only available for ssh"},
		{[]string{"scp", "fsnbx1:a", "other:b"}, "not supported"},
	} {
		out, err := runNetssh(t, tc.args...)
		if err == nil || !strings.Contains(out, tc.want) {
			t.Errorf("%v: got %s (%v), want error containing %q", tc.args, out, err, tc.want)
		}
	}
}

func TestTransferCompletion(t *testing.T) {
	prepareTransferTest(t)
	for _, tc := range []struct {
		args []string
		want string
	}{
		{[]string{"__complete", "sftp", "fsnb"}, "fsnbx1\n"},
		{[]string{"__complete", "scp", "a.txt", "fsnb"}, "fsnbx1:\n"},
		{[]string{"__complete", "tunnel", "fsnbx1", ""}, "socks\nweb\n"},
		{[]string{"__complete", "tunnel", "fsnbx1", "web", ""}, "socks\n"},
		{[]string{"__complete", "--forward", ""}, "socks\nweb\n"},
	} {
		out, err := runNetssh(t, tc.args...)
		if err != nil || !strings.HasPrefix(out+"\n", tc.want) {
			t.Errorf("%v: got %q (%v), want prefix %q", tc.args, out, err, tc.want)
		}
	}
}