package errors_test

import (
	stderrors "errors"
	"strings"
	"testing"

	apperrors "git.tukangketik.id/swanadiva/hostkeeper/internal/errors"
)

func TestAppError(t *testing.T) {
	cause := stderrors.New("underlying issue")
	appErr := apperrors.NewAppError(
		apperrors.ErrAuthFailed,
		"Authentication failed",
		cause,
		[]string{"Check credentials", "Verify key permissions"},
	)

	if appErr.Code != apperrors.ErrAuthFailed {
		t.Errorf("Expected code '%s', got '%s'", apperrors.ErrAuthFailed, appErr.Code)
	}

	if len(appErr.Hints) != 2 {
		t.Errorf("Expected 2 hints, got %d", len(appErr.Hints))
	}

	// Test error message is non-empty
	if appErr.Error() == "" {
		t.Error("Expected non-empty error message")
	}

	// Test Unwrap
	if !stderrors.Is(appErr, cause) {
		t.Error("Expected errors.Is to match the cause via Unwrap")
	}
}

func TestConnectionError(t *testing.T) {
	connErr := apperrors.NewConnectionError(
		"auth",
		"Authentication failed",
		"ssh: handshake failed",
		[]string{"Check credentials", "Verify key permissions"},
	)

	if connErr.Type != "auth" {
		t.Errorf("Expected type 'auth', got '%s'", connErr.Type)
	}

	if len(connErr.Hints) != 2 {
		t.Errorf("Expected 2 hints, got %d", len(connErr.Hints))
	}

	if connErr.Error() == "" {
		t.Error("Expected non-empty error message")
	}
}

func TestHandleSSHError(t *testing.T) {
	tests := []struct {
		name         string
		inputErr     error
		expectedType string
	}{
		{
			name:         "connection refused",
			inputErr:     stderrors.New("dial tcp: connection refused"),
			expectedType: "network",
		},
		{
			name:         "authentication failed",
			inputErr:     stderrors.New("ssh: handshake failed: ssh: unable to authenticate"),
			expectedType: "auth",
		},
		{
			name:         "timeout",
			inputErr:     stderrors.New("dial tcp: connection timed out"),
			expectedType: "timeout",
		},
		{
			name:         "no such host",
			inputErr:     stderrors.New("dial tcp: lookup: no such host"),
			expectedType: "config",
		},
		{
			name:         "permission denied",
			inputErr:     stderrors.New("ssh: permission denied"),
			expectedType: "auth",
		},
		{
			name:         "unknown error",
			inputErr:     stderrors.New("something went wrong"),
			expectedType: "unknown",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			connErr := apperrors.HandleSSHError(tt.inputErr)
			if connErr == nil {
				t.Fatal("Expected non-nil ConnectionError")
			}
			if connErr.Type != tt.expectedType {
				t.Errorf("Expected type '%s', got '%s'", tt.expectedType, connErr.Type)
			}
			if len(connErr.Hints) == 0 {
				t.Error("Expected at least one hint")
			}
		})
	}
}

func TestHandleSSHErrorNil(t *testing.T) {
	result := apperrors.HandleSSHError(nil)
	if result != nil {
		t.Error("Expected nil for nil input")
	}
}

func TestFormatConnectionError(t *testing.T) {
	connErr := apperrors.NewConnectionError(
		"auth",
		"Authentication failed",
		"ssh: handshake failed",
		[]string{"Check credentials", "Verify key permissions"},
	)

	output := apperrors.FormatConnectionError(connErr)

	if output == "" {
		t.Error("Expected non-empty formatted output")
	}

	if !strings.Contains(output, "Authentication failed") {
		t.Error("Expected output to contain error message")
	}

	if !strings.Contains(output, "Possible solutions") {
		t.Error("Expected output to contain hints section")
	}
}