package device

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

func TestLoadKeyboards(t *testing.T) {
	tmpDir := t.TempDir()
	tmpFile := filepath.Join(tmpDir, "keyboards.json")

	testData := `[
		{"name": "Test Keyboard 1", "vendorId": 22222, "productId": 1, "protocol": "via"},
		{"name": "Test Keyboard 2", "vendorId": 33333, "productId": 2, "protocol": "viapro"}
	]`

	if err := os.WriteFile(tmpFile, []byte(testData), 0644); err != nil {
		t.Fatalf("failed to write test file: %v", err)
	}

	origFind := findKeyboardsJSON
	findKeyboardsJSON = func() (string, error) {
		return tmpFile, nil
	}
	defer func() { findKeyboardsJSON = origFind }()

	keyboards, err := LoadKeyboards()
	if err != nil {
		t.Fatalf("LoadKeyboards() returned error: %v", err)
	}

	if len(keyboards) != 2 {
		t.Errorf("LoadKeyboards() returned %d keyboards, want 2", len(keyboards))
	}

	if keyboards[0].Name != "Test Keyboard 1" {
		t.Errorf("First keyboard name = %q, want %q", keyboards[0].Name, "Test Keyboard 1")
	}

	if keyboards[0].VendorID != 22222 {
		t.Errorf("First keyboard VID = %d, want %d", keyboards[0].VendorID, 22222)
	}

	if keyboards[1].ProductID != 2 {
		t.Errorf("Second keyboard PID = %d, want %d", keyboards[1].ProductID, 2)
	}
}

func TestLoadKeyboardsInvalid(t *testing.T) {
	tmpDir := t.TempDir()
	tmpFile := filepath.Join(tmpDir, "keyboards.json")

	invalidData := `[this is not valid json`

	if err := os.WriteFile(tmpFile, []byte(invalidData), 0644); err != nil {
		t.Fatalf("failed to write test file: %v", err)
	}

	origFind := findKeyboardsJSON
	findKeyboardsJSON = func() (string, error) {
		return tmpFile, nil
	}
	defer func() { findKeyboardsJSON = origFind }()

	_, err := LoadKeyboards()
	if err == nil {
		t.Error("LoadKeyboards() expected error for invalid JSON, got nil")
	}
}

func TestLoadKeyboardsEmptyFile(t *testing.T) {
	tmpDir := t.TempDir()
	tmpFile := filepath.Join(tmpDir, "keyboards.json")

	if err := os.WriteFile(tmpFile, []byte("[]"), 0644); err != nil {
		t.Fatalf("failed to write test file: %v", err)
	}

	origFind := findKeyboardsJSON
	findKeyboardsJSON = func() (string, error) {
		return tmpFile, nil
	}
	defer func() { findKeyboardsJSON = origFind }()

	keyboards, err := LoadKeyboards()
	if err != nil {
		t.Fatalf("LoadKeyboards() returned error: %v", err)
	}

	if len(keyboards) != 0 {
		t.Errorf("LoadKeyboards() returned %d keyboards, want 0", len(keyboards))
	}
}