package config

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

func setCurrentDispatcherRuntimeEnvironment(t *testing.T) string {
	t.Helper()
	database := setDispatcherEnvironment(t)
	root := t.TempDir()
	for name, value := range map[string]string{
		"DISPATCHER_GRPC_LISTEN":          "127.0.0.1:0",
		"DISPATCHER_AGENT_ENDPOINTS_FILE": filepath.Join(root, "agent-endpoints.json"),
		"DISPATCHER_OSS_CONFIG_FILE":      filepath.Join(root, "oss.json"),
		"MTLS_CA_FILE":                    filepath.Join(root, "ca.pem"),
		"MTLS_CERT_FILE":                  filepath.Join(root, "dispatcher.pem"),
		"MTLS_KEY_FILE":                   filepath.Join(root, "dispatcher.key"),
		"MTLS_PEER_CERT_FINGERPRINTS":     strings.Repeat("a", 64),
	} {
		t.Setenv(name, value)
	}
	return database
}

func TestLoadSIPOnlyDispatcherRequiresNoRecordingOrCallListener(t *testing.T) {
	setCurrentDispatcherRuntimeEnvironment(t)
	t.Setenv("DISPATCHER_GRPC_LISTEN", "")
	t.Setenv("DISPATCHER_OSS_CONFIG_FILE", "")
	t.Setenv("MTLS_PEER_CERT_FINGERPRINTS", "")
	settings, err := LoadDispatcherRuntimeEnvironment("sip-only")
	if err != nil || settings.AgentEndpointsFile == "" || settings.OSSConfigFile != "" || settings.Listen != "" {
		t.Fatalf("SIP-only process inherited Mock business listeners: %+v %v", settings, err)
	}
}

func TestLoadDispatcherRuntimeEnvironmentRequiresExplicitMockDeployment(t *testing.T) {
	database := setCurrentDispatcherRuntimeEnvironment(t)
	settings, err := LoadDispatcherRuntimeEnvironment("mock")
	if err != nil {
		t.Fatal(err)
	}
	if settings.DispatcherID != dispatcherFixtureID || settings.SQLitePath != database || settings.Listen != "127.0.0.1:0" ||
		settings.AgentEndpointsFile == "" || settings.OSSConfigFile == "" || len(settings.PeerFingerprints) != 1 {
		t.Fatal("Dispatcher deployment values were lost or replaced by a default")
	}
	if _, err := os.Stat(database); !os.IsNotExist(err) {
		t.Fatalf("preflight opened the business database: %v", err)
	}
	for _, name := range []string{
		"DISPATCHER_GRPC_LISTEN", "DISPATCHER_AGENT_ENDPOINTS_FILE", "DISPATCHER_OSS_CONFIG_FILE",
		"MTLS_CA_FILE", "MTLS_CERT_FILE", "MTLS_KEY_FILE", "MTLS_PEER_CERT_FINGERPRINTS",
	} {
		t.Run(name, func(t *testing.T) {
			setCurrentDispatcherRuntimeEnvironment(t)
			t.Setenv(name, "")
			if _, err := LoadDispatcherRuntimeEnvironment("mock"); err == nil || !strings.Contains(err.Error(), name) {
				t.Fatalf("missing Dispatcher setting silently inherited an old default: %v", err)
			}
		})
	}
}

func TestLoadDispatcherRuntimeEnvironmentRejectsExternalOrUnsupportedModeWithoutIO(t *testing.T) {
	for _, mode := range []string{"real", "mixed", ""} {
		t.Run(mode, func(t *testing.T) {
			database := setCurrentDispatcherRuntimeEnvironment(t)
			if _, err := LoadDispatcherRuntimeEnvironment(mode); err == nil || !strings.Contains(err.Error(), "Mock") {
				t.Fatalf("unapproved mode was admitted: %v", err)
			}
			if _, err := os.Stat(database); !os.IsNotExist(err) {
				t.Fatalf("mode rejection opened SQLite: %v", err)
			}
		})
	}
	setCurrentDispatcherRuntimeEnvironment(t)
	const external = "0.0.0.0:19443"
	t.Setenv("DISPATCHER_GRPC_LISTEN", external)
	if _, err := LoadDispatcherRuntimeEnvironment("mock"); err == nil || !strings.Contains(err.Error(), "DISPATCHER_GRPC_LISTEN") || strings.Contains(err.Error(), external) {
		t.Fatalf("external Mock listener was admitted or echoed: %v", err)
	}
	setCurrentDispatcherRuntimeEnvironment(t)
	const invalid = "not-a-fingerprint"
	t.Setenv("MTLS_PEER_CERT_FINGERPRINTS", invalid)
	if _, err := LoadDispatcherRuntimeEnvironment("mock"); err == nil || !strings.Contains(err.Error(), "MTLS_PEER_CERT_FINGERPRINTS") || strings.Contains(err.Error(), invalid) {
		t.Fatalf("unapproved peer fingerprint was accepted or echoed: %v", err)
	}
}