package tunnel

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

func testConfig() Config {
	return Config{
		Enabled:       true,
		TunnelID:      "abc-123",
		PublicDomain:  "pub.payne.io",
		GatewayDomain: "payne.io",
		CredentialsDir: "/tmp/creds",
	}
}

func TestGenerateConfig_Basic(t *testing.T) {
	m := NewManager(t.TempDir())

	services := []PublicService{
		{Name: "my-api"},
		{Name: "dashboard"},
	}

	out := m.GenerateConfig(testConfig(), services)

	if out == "" {
		t.Fatal("expected non-empty config")
	}

	// Check tunnel ID
	if !strings.Contains(out, "tunnel: abc-123") {
		t.Errorf("expected tunnel ID, got:\n%s", out)
	}

	// Check credentials file
	if !strings.Contains(out, "credentials-file: /tmp/creds/abc-123.json") {
		t.Errorf("expected credentials file, got:\n%s", out)
	}

	// Check public hostnames
	if !strings.Contains(out, "hostname: my-api.pub.payne.io") {
		t.Errorf("expected my-api public hostname, got:\n%s", out)
	}
	if !strings.Contains(out, "hostname: dashboard.pub.payne.io") {
		t.Errorf("expected dashboard public hostname, got:\n%s", out)
	}

	// Check Host/SNI rewriting to internal domain
	if !strings.Contains(out, "originServerName: my-api.payne.io") {
		t.Errorf("expected internal SNI for my-api, got:\n%s", out)
	}
	if !strings.Contains(out, "httpHostHeader: dashboard.payne.io") {
		t.Errorf("expected internal Host header for dashboard, got:\n%s", out)
	}

	// Check catch-all
	if !strings.Contains(out, "service: http_status:404") {
		t.Errorf("expected catch-all 404, got:\n%s", out)
	}

	// Check gateway origin
	if !strings.Contains(out, "service: https://localhost:443") {
		t.Errorf("expected gateway origin, got:\n%s", out)
	}
}

func TestGenerateConfig_SubdomainOverride(t *testing.T) {
	m := NewManager(t.TempDir())

	services := []PublicService{
		{Name: "internal-name", Subdomain: "public-name"},
	}

	out := m.GenerateConfig(testConfig(), services)

	if !strings.Contains(out, "hostname: public-name.pub.payne.io") {
		t.Errorf("expected subdomain override, got:\n%s", out)
	}
}

func TestGenerateConfig_Disabled(t *testing.T) {
	m := NewManager(t.TempDir())

	cfg := testConfig()
	cfg.Enabled = false

	out := m.GenerateConfig(cfg, []PublicService{{Name: "my-api"}})
	if out != "" {
		t.Errorf("expected empty config when disabled, got:\n%s", out)
	}
}

func TestGenerateConfig_NoServices(t *testing.T) {
	m := NewManager(t.TempDir())
	out := m.GenerateConfig(testConfig(), nil)
	if out != "" {
		t.Errorf("expected empty config with no services, got:\n%s", out)
	}
}

func TestGenerateConfig_MissingTunnelID(t *testing.T) {
	m := NewManager(t.TempDir())
	cfg := testConfig()
	cfg.TunnelID = ""

	out := m.GenerateConfig(cfg, []PublicService{{Name: "my-api"}})
	if out != "" {
		t.Errorf("expected empty config with missing tunnel ID, got:\n%s", out)
	}
}

func TestWriteConfig(t *testing.T) {
	tmpDir := t.TempDir()
	m := NewManager(tmpDir)

	services := []PublicService{{Name: "my-api"}}
	if err := m.WriteConfig(testConfig(), services); err != nil {
		t.Fatalf("WriteConfig failed: %v", err)
	}

	// Verify file was written
	configPath := filepath.Join(tmpDir, "tunnel", "config.yml")
	data, err := os.ReadFile(configPath)
	if err != nil {
		t.Fatalf("Failed to read config: %v", err)
	}

	if !strings.Contains(string(data), "my-api.pub.payne.io") {
		t.Errorf("expected my-api hostname in written config, got:\n%s", string(data))
	}
}

func TestWriteConfig_RemovesWhenDisabled(t *testing.T) {
	tmpDir := t.TempDir()
	m := NewManager(tmpDir)

	// Write config first
	if err := m.WriteConfig(testConfig(), []PublicService{{Name: "my-api"}}); err != nil {
		t.Fatalf("WriteConfig failed: %v", err)
	}

	// Now disable and write again — should remove the file
	cfg := testConfig()
	cfg.Enabled = false
	if err := m.WriteConfig(cfg, []PublicService{{Name: "my-api"}}); err != nil {
		t.Fatalf("WriteConfig (disable) failed: %v", err)
	}

	configPath := filepath.Join(tmpDir, "tunnel", "config.yml")
	if _, err := os.Stat(configPath); !os.IsNotExist(err) {
		t.Error("expected config file to be removed when disabled")
	}
}