package output

import (
	"bytes"
	"encoding/json"
	"os"
	"testing"

	"ja4sentinel/api"
)

func TestStdoutWriter(t *testing.T) {
	// Capture stdout by replacing it temporarily
	oldStdout := os.Stdout
	r, w, _ := os.Pipe()
	os.Stdout = w

	writer := NewStdoutWriter()
	rec := api.LogRecord{
		SrcIP:   "192.168.1.1",
		SrcPort: 12345,
		DstIP:   "10.0.0.1",
		DstPort: 443,
		JA4:     "t12s0102ab_1234567890ab",
	}

	err := writer.Write(rec)
	if err != nil {
		t.Errorf("Write() error = %v", err)
	}

	w.Close()
	os.Stdout = oldStdout

	var buf bytes.Buffer
	buf.ReadFrom(r)
	output := buf.String()

	if output == "" {
		t.Error("Write() produced no output")
	}

	// Verify it's valid JSON
	var result api.LogRecord
	if err := json.Unmarshal([]byte(output), &result); err != nil {
		t.Errorf("Output is not valid JSON: %v", err)
	}
}

func TestFileWriter(t *testing.T) {
	// Create a temporary file
	tmpFile := "/tmp/ja4sentinel_test.log"
	defer os.Remove(tmpFile)

	writer, err := NewFileWriter(tmpFile)
	if err != nil {
		t.Fatalf("NewFileWriter() error = %v", err)
	}
	defer writer.Close()

	rec := api.LogRecord{
		SrcIP:   "192.168.1.1",
		SrcPort: 12345,
		DstIP:   "10.0.0.1",
		DstPort: 443,
		JA4:     "t12s0102ab_1234567890ab",
	}

	err = writer.Write(rec)
	if err != nil {
		t.Errorf("Write() error = %v", err)
	}

	// Read the file and verify
	data, err := os.ReadFile(tmpFile)
	if err != nil {
		t.Fatalf("Failed to read file: %v", err)
	}

	if len(data) == 0 {
		t.Error("Write() produced no output")
	}

	// Verify it's valid JSON
	var result api.LogRecord
	if err := json.Unmarshal(data, &result); err != nil {
		t.Errorf("Output is not valid JSON: %v", err)
	}
}

func TestMultiWriter(t *testing.T) {
	multiWriter := NewMultiWriter()

	// Create a temporary file writer
	tmpFile := "/tmp/ja4sentinel_multi_test.log"
	defer os.Remove(tmpFile)

	fileWriter, err := NewFileWriter(tmpFile)
	if err != nil {
		t.Fatalf("NewFileWriter() error = %v", err)
	}
	defer fileWriter.Close()

	multiWriter.Add(fileWriter)
	multiWriter.Add(NewStdoutWriter())

	rec := api.LogRecord{
		SrcIP:   "192.168.1.1",
		SrcPort: 12345,
		DstIP:   "10.0.0.1",
		DstPort: 443,
		JA4:     "t12s0102ab_1234567890ab",
	}

	err = multiWriter.Write(rec)
	if err != nil {
		t.Errorf("Write() error = %v", err)
	}

	// Verify file output
	data, err := os.ReadFile(tmpFile)
	if err != nil {
		t.Fatalf("Failed to read file: %v", err)
	}

	if len(data) == 0 {
		t.Error("MultiWriter.Write() produced no file output")
	}
}

func TestBuilderNewFromConfig(t *testing.T) {
	builder := NewBuilder()

	tests := []struct {
		name    string
		cfg     api.AppConfig
		wantErr bool
	}{
		{
			name: "stdout output",
			cfg: api.AppConfig{
				Outputs: []api.OutputConfig{
					{Type: "stdout", Enabled: true},
				},
			},
			wantErr: false,
		},
		{
			name: "file output",
			cfg: api.AppConfig{
				Outputs: []api.OutputConfig{
					{
						Type:    "file",
						Enabled: true,
						Params:  map[string]string{"path": "/tmp/ja4sentinel_builder_test.log"},
					},
				},
			},
			wantErr: false,
		},
		{
			name: "file output without path",
			cfg: api.AppConfig{
				Outputs: []api.OutputConfig{
					{Type: "file", Enabled: true},
				},
			},
			wantErr: true,
		},
		{
			name: "unix socket output",
			cfg: api.AppConfig{
				Outputs: []api.OutputConfig{
					{
						Type:    "unix_socket",
						Enabled: true,
						Params:  map[string]string{"socket_path": "/tmp/ja4sentinel_test.sock"},
					},
				},
			},
			wantErr: false,
		},
		{
			name: "unknown output type",
			cfg: api.AppConfig{
				Outputs: []api.OutputConfig{
					{Type: "unknown", Enabled: true},
				},
			},
			wantErr: true,
		},
		{
			name:    "no outputs (should default to stdout)",
			cfg:     api.AppConfig{},
			wantErr: false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			writer, err := builder.NewFromConfig(tt.cfg)
			if (err != nil) != tt.wantErr {
				t.Errorf("NewFromConfig() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if !tt.wantErr && writer == nil {
				t.Error("NewFromConfig() returned nil writer")
			}
		})
	}
}

func TestUnixSocketWriter(t *testing.T) {
	// Test creation without socket (should not fail)
	socketPath := "/tmp/ja4sentinel_nonexistent.sock"
	writer, err := NewUnixSocketWriter(socketPath)
	if err != nil {
		t.Fatalf("NewUnixSocketWriter() error = %v", err)
	}

	// Write should fail since socket doesn't exist
	rec := api.LogRecord{
		SrcIP:   "192.168.1.1",
		SrcPort: 12345,
		DstIP:   "10.0.0.1",
		DstPort: 443,
	}

	err = writer.Write(rec)
	if err == nil {
		t.Error("Write() should fail for non-existent socket")
	}

	writer.Close()
}