package e2e

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

func TestConfigPropagation(t *testing.T) {
	binaryPath := EnsureBinary(t)

	tmpConfigDir := t.TempDir()
	tmpRuntimeDir := t.TempDir()
	profile := "config-test-vpn"

	// Write a valid dummy profile for config-test-vpn so it doesn't fail the profile-existence check
	confContent := `[Interface]
PrivateKey = YXNkZmFzZGZhc2RmYXNkZmFzZGZhc2RmYXNkZmFzZGY=
Address = 10.0.0.2/24

[Peer]
PublicKey = YXNkZmFzZGZhc2RmYXNkZmFzZGZhc2RmYXNkZmFzZGY=
Endpoint = 127.0.0.1:51820
AllowedIPs = 10.0.0.0/24
`
	profilesDir := filepath.Join(tmpConfigDir, "wg-wrap", "profiles")
	_ = os.MkdirAll(profilesDir, 0755)
	_ = os.WriteFile(filepath.Join(profilesDir, profile+".conf"), []byte(confContent), 0644)

	// Test 1: Non-isolated configuration
	cmd := exec.Command(binaryPath, "show-config", "--profile", profile)
	cmd.Env = append(os.Environ(),
		fmt.Sprintf("XDG_RUNTIME_DIR=%s", tmpRuntimeDir),
		fmt.Sprintf("XDG_CONFIG_HOME=%s", tmpConfigDir),
	)
	out, err := cmd.CombinedOutput()
	if err != nil {
		t.Fatalf("show-config failed: %v\nOutput: %s", err, string(out))
	}

	output := string(out)
	expectedBase := tmpRuntimeDir
	expectedPids := fmt.Sprintf("%s/profiles/%s/pids", tmpRuntimeDir, profile)

	if !strings.Contains(output, fmt.Sprintf("Runtime Base:  %s", expectedBase)) {
		t.Errorf("Expected Runtime Base %s in output: %s", expectedBase, output)
	}
	if !strings.Contains(output, fmt.Sprintf("PIDs Path:     %s", expectedPids)) {
		t.Errorf("Expected PIDs Path %s in output: %s", expectedPids, output)
	}

	// Test 2: Configuration after bootstrap (Isolated)
	cmdIsolated := exec.Command(binaryPath, "run", "--profile", profile, "--", "sh", "-c", "echo $XDG_RUNTIME_DIR")
	cmdIsolated.Env = append(os.Environ(),
		fmt.Sprintf("XDG_RUNTIME_DIR=%s", tmpRuntimeDir),
		fmt.Sprintf("XDG_CONFIG_HOME=%s", tmpConfigDir),
	)
	outIso, err := cmdIsolated.CombinedOutput()
	if err != nil {
		t.Fatalf("Isolated command failed: %v\nOutput: %s", err, string(outIso))
	}

	if !strings.Contains(string(outIso), expectedBase) {
		t.Errorf("Expected isolated process to see XDG_RUNTIME_DIR=%s, got: %s", expectedBase, string(outIso))
	}
}