condition_builder.h

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// BSD 3-Clause License
// Copyright (c) 2025, 🍀☀🌕🌥 🌊
// See the LICENSE file in the project root for full license information.
 
#pragma once
 
#include "../database_types.h"
#include "value_formatter.h"
#include <string>
#include <vector>
#include <memory>
 
namespace database::query {
 
enum class logical_op {
    AND,
    OR
};
 
struct condition {
    std::string field;           
    std::string op;              
    core::database_value value;        
    std::string raw;             
 
    bool is_raw() const { return !raw.empty(); }
};
 
class condition_builder {
public:
    condition_builder();
 
    condition_builder& add(const condition& cond, logical_op op = logical_op::AND);
 
    condition_builder& add(const std::string& field, const std::string& operator_,
                          const core::database_value& value, logical_op op = logical_op::AND);
 
    condition_builder& add_raw(const std::string& raw, logical_op op = logical_op::AND);
 
    condition_builder& begin_group();
 
    condition_builder& end_group();
 
    std::string build(const value_formatter& formatter) const;
 
    bool empty() const;
 
    void clear();
 
private:
    struct condition_node {
        condition cond;
        logical_op op;
        int group_level;
        bool is_group_start;
        bool is_group_end;
    };
 
    std::vector<condition_node> nodes_;
    int current_group_level_;
 
    std::string format_condition(const condition& cond, const value_formatter& formatter) const;
    std::string logical_op_to_string(logical_op op) const;
};
 
} // namespace database::query