package ast

import (
	"golox/token"
	"testing"
)

func TestPrinter(t *testing.T) {
	tests := []struct {
		name     string
		expr     Expr
		expected string
	}{
		{
			name: "Binary expression",
			expr: &BinaryExpr{
				Left:     &LiteralExpr{Value: 1},
				Operator: token.Token{Type: token.PLUS, Lexeme: "+"},
				Right:    &LiteralExpr{Value: 2},
			},
			expected: "(+ 1 2)",
		},
		{
			name: "Grouping expression",
			expr: &GroupingExpr{
				Expression: &LiteralExpr{Value: 1},
			},
			expected: "(group 1)",
		},
		{
			name:     "Literal expression",
			expr:     &LiteralExpr{Value: 123},
			expected: "123",
		},
		{
			name: "Unary expression",
			expr: &UnaryExpr{
				Operator: token.Token{Type: token.MINUS, Lexeme: "-"},
				Right:    &LiteralExpr{Value: 123},
			},
			expected: "(- 123)",
		},
		{
			name:     "Nil literal expression",
			expr:     &LiteralExpr{Value: nil},
			expected: "nil",
		},
		{
			name:     "Error expression",
			expr:     &ErrorExpr{Value: "error"},
			expected: "error",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			printer := NewPrinter()
			result := printer.Print(tt.expr)
			if result != tt.expected {
				t.Errorf("expected %v, got %v", tt.expected, result)
			}
		})
	}
}