#include "duckdb/parser/expression/columnref_expression.hpp"

#include "duckdb/common/exception.hpp"
#include "duckdb/common/serializer.hpp"
#include "duckdb/common/types/hash.hpp"

namespace duckdb {

//! Specify both the column and table name
ColumnRefExpression::ColumnRefExpression(string column_name, string table_name)
    : ParsedExpression(ExpressionType::COLUMN_REF, ExpressionClass::COLUMN_REF), column_name(move(column_name)),
      table_name(move(table_name)) {
}

ColumnRefExpression::ColumnRefExpression(string column_name) : ColumnRefExpression(move(column_name), string()) {
}

string ColumnRefExpression::GetName() const {
	return !alias.empty() ? alias : column_name;
}

string ColumnRefExpression::ToString() const {
	if (table_name.empty()) {
		return column_name;
	} else {
		return table_name + "." + column_name;
	}
}

bool ColumnRefExpression::Equals(const ColumnRefExpression *a, const ColumnRefExpression *b) {
	return a->column_name == b->column_name && a->table_name == b->table_name;
}

hash_t ColumnRefExpression::Hash() const {
	hash_t result = ParsedExpression::Hash();
	result = CombineHash(result, duckdb::Hash<const char *>(column_name.c_str()));
	return result;
}

unique_ptr<ParsedExpression> ColumnRefExpression::Copy() const {
	auto copy = make_unique<ColumnRefExpression>(column_name, table_name);
	copy->CopyProperties(*this);
	return move(copy);
}

void ColumnRefExpression::Serialize(Serializer &serializer) {
	ParsedExpression::Serialize(serializer);
	serializer.WriteString(table_name);
	serializer.WriteString(column_name);
}

unique_ptr<ParsedExpression> ColumnRefExpression::Deserialize(ExpressionType type, Deserializer &source) {
	auto table_name = source.Read<string>();
	auto column_name = source.Read<string>();
	auto expression = make_unique<ColumnRefExpression>(column_name, table_name);
	return move(expression);
}

} // namespace duckdb