package cli

import (
	"bytes"
	"context"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"
)

func run(ctx context.Context, args ...string) (code int, stdout, stderr string) {
	var out, errb bytes.Buffer
	code = Run(ctx, args, &out, &errb)
	return code, out.String(), errb.String()
}

func TestRun_Usage(t *testing.T) {
	code, _, stderr := run(context.Background())
	if code != 2 || !strings.Contains(stderr, "sultan server") {
		t.Errorf("ohne Befehl: code=%d stderr=%q", code, stderr)
	}
	code, stdout, _ := run(context.Background(), "help")
	if code != 0 || !strings.Contains(stdout, "sultan server") || !strings.Contains(stdout, "sultan agent") {
		t.Errorf("help: code=%d stdout=%q", code, stdout)
	}
	code, _, stderr = run(context.Background(), "zaubern")
	if code != 2 || !strings.Contains(stderr, "zaubern") {
		t.Errorf("unbekannter Befehl: code=%d stderr=%q", code, stderr)
	}
}

func TestRun_Version(t *testing.T) {
	code, stdout, _ := run(context.Background(), "version")
	lines := strings.Split(strings.TrimSpace(stdout), "\n")
	if code != 0 || lines[0] != "sultan "+Version {
		t.Errorf("version: code=%d stdout=%q", code, stdout)
	}
	// Die aktive Zeitzone sichtbar machen (Distroless-Images ohne tzdata fallen still auf UTC).
	if len(lines) < 2 || lines[1] != "Zeitzone: "+time.Local.String() {
		t.Errorf("Zeitzone fehlt: %q", stdout)
	}
}

func TestServerFlags(t *testing.T) {
	cfg, err := parseServerFlags(nil, &bytes.Buffer{}, noEnv)
	if err != nil {
		t.Fatal(err)
	}
	if cfg.DataDir != "./suldata" || cfg.AgentAddr != ":8443" || cfg.ProviderAddr != "127.0.0.1:8080" ||
		cfg.LanderAddr != "127.0.0.1:8081" || cfg.InterceptorURL != "" || cfg.RefreshInterval != time.Minute {
		t.Errorf("Defaults: %+v", cfg)
	}

	cfg, err = parseServerFlags([]string{
		"--data-dir=/srv/sul", "--agent-addr", ":9443", "--provider-addr=:8080",
		"--interceptor-url=http://lander:8081", "--refresh=30s", "--lander-addr=none",
		"--hoster-name=Beispiel-Hosting", "--hoster-url=https://hoster.example", "--pro-url=https://hoster.example/pro",
		"--public-url=https://ingress.example:8443", "--public-url=https://100.64.0.1:8443",
		"--lease-duration=1h",
		"--notify-slack=https://hooks.example/a", "--notify-slack=https://hooks.example/b",
		"--notify-ntfy=https://ntfy.example/sultan", "--notify-ntfy-token=tk_x", "--offline-alert-after=10m",
	}, &bytes.Buffer{}, noEnv)
	if err != nil {
		t.Fatal(err)
	}
	if cfg.DataDir != "/srv/sul" || cfg.AgentAddr != ":9443" || cfg.ProviderAddr != ":8080" ||
		cfg.InterceptorURL != "http://lander:8081" || cfg.RefreshInterval != 30*time.Second || cfg.LanderAddr != "none" ||
		cfg.HosterName != "Beispiel-Hosting" || cfg.HosterURL != "https://hoster.example" || cfg.ProURL != "https://hoster.example/pro" ||
		strings.Join(cfg.PublicURLs, ",") != "https://ingress.example:8443,https://100.64.0.1:8443" || cfg.LeaseDuration != time.Hour ||
		strings.Join(cfg.SlackWebhooks, ",") != "https://hooks.example/a,https://hooks.example/b" ||
		strings.Join(cfg.NtfyURLs, ",") != "https://ntfy.example/sultan" || cfg.NtfyToken != "tk_x" ||
		cfg.OfflineAlertAfter != 10*time.Minute {
		t.Errorf("Overrides: %+v", cfg)
	}

	if _, err := parseServerFlags([]string{"--gibts-nicht"}, &bytes.Buffer{}, noEnv); err == nil {
		t.Error("unbekanntes Flag akzeptiert")
	}
	if _, err := parseServerFlags([]string{"überzählig"}, &bytes.Buffer{}, noEnv); err == nil {
		t.Error("überzähliges Argument akzeptiert")
	}
}

func TestRun_ServerHelpAndBadFlags(t *testing.T) {
	code, stdout, stderr := run(context.Background(), "server", "--help")
	if code != 0 || !strings.Contains(stdout+stderr, "data-dir") {
		t.Errorf("server --help: code=%d out=%q err=%q", code, stdout, stderr)
	}
	code, _, _ = run(context.Background(), "server", "--bogus")
	if code != 2 {
		t.Errorf("server --bogus: code=%d", code)
	}
}

// Startet den echten Server über die CLI und beendet ihn per Kontext
// (wie SIGTERM in main).
func TestRun_ServerStartsAndStops(t *testing.T) {
	dir := filepath.Join(t.TempDir(), "suldata")
	ctx, cancel := context.WithCancel(context.Background())
	type result struct {
		code   int
		stderr string
	}
	done := make(chan result, 1)
	go func() {
		code, _, stderr := run(ctx, "server", "--data-dir="+dir, "--agent-addr=127.0.0.1:0", "--provider-addr=127.0.0.1:0", "--lander-addr=127.0.0.1:0")
		done <- result{code, stderr}
	}()

	deadline := time.Now().Add(5 * time.Second)
	for {
		if _, err := os.Stat(filepath.Join(dir, "server.crt")); err == nil {
			break
		}
		if time.Now().After(deadline) {
			t.Fatal("Server hat das Datenverzeichnis nicht angelegt")
		}
		time.Sleep(10 * time.Millisecond)
	}
	time.Sleep(100 * time.Millisecond)
	cancel()

	select {
	case r := <-done:
		if r.code != 0 {
			t.Errorf("Exit-Code %d, stderr:\n%s", r.code, r.stderr)
		}
		if !strings.Contains(r.stderr, "Fingerprint") {
			t.Errorf("Start-Log ohne Fingerprint:\n%s", r.stderr)
		}
	case <-time.After(10 * time.Second):
		t.Fatal("Server endet nicht")
	}
}

func TestRun_ServerStartError(t *testing.T) {
	file := filepath.Join(t.TempDir(), "datei")
	os.WriteFile(file, nil, 0o600)
	code, _, stderr := run(context.Background(), "server", "--data-dir="+filepath.Join(file, "sub"))
	if code != 1 || stderr == "" {
		t.Errorf("unbrauchbares Datenverzeichnis: code=%d stderr=%q", code, stderr)
	}
}

func TestRun_DumpLanding(t *testing.T) {
	dir := filepath.Join(t.TempDir(), "landing")
	code, stdout, stderr := run(context.Background(), "dump-landing", "--out="+dir)
	if code != 0 {
		t.Fatalf("code=%d stderr=%s", code, stderr)
	}
	if !strings.Contains(stdout, "maintenance.html") {
		t.Errorf("Ausgabe ohne Dateiliste: %q", stdout)
	}
	if _, err := os.Stat(filepath.Join(dir, "README.txt")); err != nil {
		t.Error("README.txt fehlt")
	}
	if code, _, stderr := run(context.Background(), "dump-landing", "--out="+dir); code != 1 || !strings.Contains(stderr, "--force") {
		t.Errorf("ohne --force: code=%d stderr=%q", code, stderr)
	}
	if code, _, _ := run(context.Background(), "dump-landing", "--out="+dir, "--force"); code != 0 {
		t.Errorf("mit --force: code=%d", code)
	}
	if code, _, _ := run(context.Background(), "dump-landing", "überzählig"); code != 2 {
		t.Errorf("überzähliges Argument: code=%d", code)
	}
}

func TestDumpLandingDefaultDir(t *testing.T) {
	out, err := parseDumpFlags(nil, &bytes.Buffer{})
	if err != nil || out.dir != "./suldata/landing" || out.force {
		t.Errorf("Defaults: %+v %v", out, err)
	}
}

func envMap(m map[string]string) func(string) string { return func(k string) string { return m[k] } }

// Jedes Flag ist auch als SULTAN_<FLAG> setzbar; Flags gewinnen, Listen
// sind kommagetrennt und werden durch ein Flag ersetzt, nicht ergänzt.
func TestServerFlags_Environment(t *testing.T) {
	env := envMap(map[string]string{
		"SULTAN_DATA_DIR":          "/srv/sul",
		"SULTAN_PUBLIC_URL":        "https://a.example:8443, https://100.64.0.1:8443",
		"SULTAN_NOTIFY_NTFY_TOKEN": "tk_geheim",
		"SULTAN_REFRESH":           "30s",
		"SULTAN_ENROLL_LIMIT":      "5",
	})
	cfg, err := parseServerFlags(nil, &bytes.Buffer{}, env)
	if err != nil {
		t.Fatal(err)
	}
	if cfg.DataDir != "/srv/sul" || strings.Join(cfg.PublicURLs, ",") != "https://a.example:8443,https://100.64.0.1:8443" ||
		cfg.NtfyToken != "tk_geheim" || cfg.RefreshInterval != 30*time.Second || cfg.EnrollLimit != 5 {
		t.Errorf("aus Umgebung: %+v", cfg)
	}

	cfg, err = parseServerFlags([]string{"--public-url=https://c.example:8443", "--data-dir=/anders"}, &bytes.Buffer{}, env)
	if err != nil {
		t.Fatal(err)
	}
	if strings.Join(cfg.PublicURLs, ",") != "https://c.example:8443" || cfg.DataDir != "/anders" {
		t.Errorf("Flags müssen gewinnen (Listen ersetzen): %v %q", cfg.PublicURLs, cfg.DataDir)
	}

	if _, err := parseServerFlags(nil, &bytes.Buffer{}, envMap(map[string]string{"SULTAN_REFRESH": "bald"})); err == nil ||
		!strings.Contains(err.Error(), "SULTAN_REFRESH") {
		t.Errorf("fehlerhafte Variable nicht benannt: %v", err)
	}
	var help bytes.Buffer
	parseServerFlags([]string{"--help"}, &help, noEnv)
	if !strings.Contains(help.String(), "SULTAN_PUBLIC_URL") || !strings.Contains(help.String(), "SULTAN_NOTIFY_NTFY_TOKEN") {
		t.Errorf("Hilfe ohne Variablennamen:\n%s", help.String())
	}
}

func TestServerFlags_EnrollLimit(t *testing.T) {
	cfg, _ := parseServerFlags(nil, &bytes.Buffer{}, noEnv)
	if cfg.EnrollLimit != 10 {
		t.Errorf("Default %d", cfg.EnrollLimit)
	}
	cfg, _ = parseServerFlags([]string{"--enroll-limit=-1"}, &bytes.Buffer{}, noEnv) // -1 = unbegrenzt
	if cfg.EnrollLimit != -1 {
		t.Errorf("--enroll-limit=-1: %d", cfg.EnrollLimit)
	}
}

// Leere Werte (z. B. --public-url=${SULTAN_PUBLIC_URL} mit leerer Variable in
// Compose) dürfen den Server nicht am Start hindern.
func TestServerFlags_EmptyPublicURLIgnored(t *testing.T) {
	cfg, err := parseServerFlags([]string{"--public-url=", "--public-url= ", "--notify-slack="}, &bytes.Buffer{}, noEnv)
	if err != nil {
		t.Fatal(err)
	}
	if len(cfg.PublicURLs) != 0 || len(cfg.SlackWebhooks) != 0 {
		t.Errorf("leere Werte übernommen: %q %q", cfg.PublicURLs, cfg.SlackWebhooks)
	}
}

// Accountant-Anbindung (Spec 5.3): Einladung und Adresse, auch per Umgebung.
func TestServerFlags_Accountant(t *testing.T) {
	cfg, err := parseServerFlags([]string{"--accountant=https://acc.example:8444", "--accountant-token=sltn_enroll_x.y"},
		&bytes.Buffer{}, noEnv)
	if err != nil {
		t.Fatal(err)
	}
	if cfg.AccountantURL != "https://acc.example:8444" || cfg.AccountantToken != "sltn_enroll_x.y" {
		t.Errorf("Flags: %+v", cfg)
	}
	env := envMap(map[string]string{"SULTAN_ACCOUNTANT_TOKEN": "sltn_enroll_env", "SULTAN_ACCOUNTANT": "https://env:8444"})
	cfg, err = parseServerFlags(nil, &bytes.Buffer{}, env)
	if err != nil {
		t.Fatal(err)
	}
	if cfg.AccountantURL != "https://env:8444" || cfg.AccountantToken != "sltn_enroll_env" {
		t.Errorf("Umgebung: %+v", cfg)
	}
}