package client

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

func TestNormalizeAPI(t *testing.T) {
	cases := map[string]string{
		"tunnel.tzgyn.dev":          "https://tunnel.tzgyn.dev",
		"https://tunnel.tzgyn.dev/": "https://tunnel.tzgyn.dev",
		"http://127.0.0.1:8080":     "http://127.0.0.1:8080",
	}
	for input, want := range cases {
		got, err := NormalizeAPI(input)
		if err != nil || got != want {
			t.Errorf("NormalizeAPI(%q) = %q, %v; want %q", input, got, err, want)
		}
	}
	if _, err := NormalizeAPI("ftp://example.com"); err == nil {
		t.Error("ftp should be rejected")
	}
}

func TestNormalizeTarget(t *testing.T) {
	cases := map[string]string{
		"3000":           "127.0.0.1:3000",
		":3000":          "127.0.0.1:3000",
		"127.0.0.1:4096": "127.0.0.1:4096",
		"localhost:8080": "localhost:8080",
		"[::1]:3000":     "[::1]:3000",
	}
	for input, want := range cases {
		got, err := NormalizeTarget(input)
		if err != nil || got != want {
			t.Errorf("NormalizeTarget(%q) = %q, %v; want %q", input, got, err, want)
		}
	}
	for _, bad := range []string{"", "http://x", "localhost", "127.0.0.1:0", "127.0.0.1:99999"} {
		if _, err := NormalizeTarget(bad); err == nil {
			t.Errorf("NormalizeTarget(%q) should fail", bad)
		}
	}
}

func TestConfigRoundTrip(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.json")
	cfg := &Config{API: "https://tunnel.example", Routes: map[string]Route{}}
	if err := cfg.AddRoute("api", "4096", ""); err != nil {
		t.Fatal(err)
	}
	if err := cfg.Save(path); err != nil {
		t.Fatal(err)
	}
	info, err := os.Stat(path)
	if err != nil {
		t.Fatal(err)
	}
	if info.Mode().Perm() != 0o600 {
		t.Errorf("mode = %o, want 600", info.Mode().Perm())
	}
	loaded, err := Load(path)
	if err != nil {
		t.Fatal(err)
	}
	if loaded.API != cfg.API || loaded.Routes["api"].Target != "127.0.0.1:4096" {
		t.Errorf("round trip: %+v", loaded)
	}
}

func TestEnsureIdentityReusesCSR(t *testing.T) {
	paths := ConfigPaths(filepath.Join(t.TempDir(), "config.json"))
	key1, csr1, err := EnsureIdentity(paths, "abc.tunnel.example")
	if err != nil {
		t.Fatal(err)
	}
	key2, csr2, err := EnsureIdentity(paths, "abc.tunnel.example")
	if err != nil {
		t.Fatal(err)
	}
	if string(key1) != string(key2) || string(csr1) != string(csr2) {
		t.Error("identity was regenerated on the second call")
	}
	if !csrMatches(csr1, "abc.tunnel.example") {
		t.Error("CSR does not match the hostname")
	}
}

func TestRouteForSNI(t *testing.T) {
	host := "abc.tunnel.example"
	cases := map[string]string{
		host:                       "@",
		"api." + host:              "api",
		"API." + host:              "api",
		"api." + host + ".":        "api",
		"a.b." + host:              "",
		"other.example":            "",
		"api.abc.tunnel.example.x": "",
	}
	for sni, want := range cases {
		if got := routeForSNI(host, sni); got != want {
			t.Errorf("routeForSNI(%q) = %q, want %q", sni, got, want)
		}
	}
}

func TestReadOfficialRoutes(t *testing.T) {
	path := filepath.Join(t.TempDir(), "coolify.toml")
	body := `[routes]
api = "127.0.0.1:4096"
web = { target = "localhost:3000", proxy_protocol = "v2" }
`
	if err := os.WriteFile(path, []byte(body), 0o600); err != nil {
		t.Fatal(err)
	}
	routes, err := readOfficialRoutes(path)
	if err != nil {
		t.Fatal(err)
	}
	if routes["api"].Target != "127.0.0.1:4096" {
		t.Errorf("api = %+v", routes["api"])
	}
	if routes["web"].Target != "localhost:3000" || routes["web"].ProxyProtocol != "v2" {
		t.Errorf("web = %+v", routes["web"])
	}
}

func TestImportOfficialProfile(t *testing.T) {
	root := t.TempDir()
	dataHome := filepath.Join(root, "data")
	configHome := filepath.Join(root, "config")
	t.Setenv("XDG_DATA_HOME", dataHome)
	t.Setenv("XDG_CONFIG_HOME", configHome)

	sourceDir := filepath.Join(dataHome, "opentunnel", "coolify")
	if err := os.MkdirAll(sourceDir, 0o700); err != nil {
		t.Fatal(err)
	}
	officialPaths := ConfigPaths(filepath.Join(root, "official", "config.json"))
	keyPEM, _, err := EnsureIdentity(officialPaths, "abc.tunnel.example")
	if err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(sourceDir, "tunnel.json"), []byte(`{"id":"abc","hostname":"abc.tunnel.example","certificateExpiry":"2027-01-01T00:00:00Z"}`), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(sourceDir, "token"), []byte("tok\n"), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(sourceDir, "private-key.pem"), keyPEM, 0o600); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(sourceDir, "certificate.pem"), []byte("dummy"), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(sourceDir, "chain.pem"), []byte("dummy"), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := os.MkdirAll(filepath.Join(configHome, "opentunnel"), 0o700); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(configHome, "opentunnel", "coolify.toml"), []byte("[routes]\napi = \"127.0.0.1:4096\"\n"), 0o600); err != nil {
		t.Fatal(err)
	}

	target := filepath.Join(root, "client", "config.json")
	result, err := Import(ImportOptions{Profile: "coolify", API: "https://tunnel.example", ConfigPath: target})
	if err != nil {
		t.Fatal(err)
	}
	if result.TunnelID != "abc" || result.Hostname != "abc.tunnel.example" {
		t.Errorf("result = %+v", result)
	}
	cfg, err := Load(target)
	if err != nil {
		t.Fatal(err)
	}
	if cfg.Token != "tok" || cfg.API != "https://tunnel.example" || cfg.Routes["api"].Target != "127.0.0.1:4096" {
		t.Errorf("config = %+v", cfg)
	}
	if _, err := os.Stat(ConfigPaths(target).Key); err != nil {
		t.Errorf("key not copied: %v", err)
	}
}

func TestProxyHeaders(t *testing.T) {
	if got := string(proxyV1("203.0.113.9:51234")); got != "PROXY TCP4 203.0.113.9 0.0.0.0 51234 443\r\n" {
		t.Errorf("v1 = %q", got)
	}
	if got := string(proxyV1("nonsense")); got != "PROXY UNKNOWN\r\n" {
		t.Errorf("v1 unknown = %q", got)
	}
	v2 := proxyV2("203.0.113.9:51234", "api.example")
	sig := "\r\n\r\n\x00\r\nQUIT\n"
	if !strings.HasPrefix(string(v2), sig) {
		t.Fatalf("v2 signature missing")
	}
	if v2[12] != 0x21 || v2[13] != 0x11 {
		t.Errorf("v2 version/family = %x %x", v2[12], v2[13])
	}
	if !strings.HasSuffix(string(v2), "api.example") {
		t.Errorf("v2 TLV missing")
	}
	unknown := proxyV2("nonsense", "")
	if unknown[12] != 0x20 {
		t.Errorf("v2 local command = %x", unknown[12])
	}
}