// SPDX-License-Identifier: MIT
// SPDX-FileCopyrightText: 2026 Martino Ferrari

#pragma once

#include <string>
#include <utility>
#include <vector>

namespace udpscope {

/// A source's settings: an ordered string key/value map. It is the stored form (top-level
/// `source_opt_<key>` entries of a session), the `--source-opt k=v` form, and what a config form
/// reads and writes. Order is insertion order, so a stored session stays diff-friendly.
class SourceConfig {
 public:
  using Items = std::vector<std::pair<std::string, std::string>>;

  SourceConfig() = default;
  explicit SourceConfig(Items items) : items_(std::move(items)) {}

  /// Replaces the value in place if the key exists, else appends.
  void set(const std::string& key, const std::string& value);
  bool has(const std::string& key) const;
  std::string get(const std::string& key, const std::string& def = {}) const;
  long get_int(const std::string& key, long def) const;
  double get_double(const std::string& key, double def) const;
  /// 1/true/yes/on and 0/false/no/off (case-insensitive); anything else gives `def`.
  bool get_bool(const std::string& key, bool def) const;

  /// Parses `k=v`; false (and no change) if there is no `=` or the key is not `valid_key`.
  bool parse_assignment(const std::string& kv);

  const Items& items() const noexcept { return items_; }
  bool empty() const noexcept { return items_.empty(); }

  /// `[A-Za-z0-9_]+` -- the characters that survive as a TOML bare key suffix.
  static bool valid_key(const std::string& key);

 private:
  Items items_;
};

}  // namespace udpscope