#ifndef ORDERED_ENV_HPP
#define ORDERED_ENV_HPP

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

namespace dropshell {

// Type alias for insertion-ordered environment variables
using ordered_env_vars = std::vector<std::pair<std::string, std::string>>;

// Helper functions for working with ordered_env_vars like a map

// Find a variable by key (returns iterator)
inline auto find_var(ordered_env_vars& vars, const std::string& key) {
    return std::find_if(vars.begin(), vars.end(),
        [&](const auto& p) { return p.first == key; });
}

inline auto find_var(const ordered_env_vars& vars, const std::string& key) {
    return std::find_if(vars.begin(), vars.end(),
        [&](const auto& p) { return p.first == key; });
}

// Get a variable value (returns empty string if not found)
inline std::string get_var(const ordered_env_vars& vars, const std::string& key) {
    auto it = find_var(vars, key);
    return (it != vars.end()) ? it->second : "";
}

// Set a variable (updates if exists, appends if new)
inline void set_var(ordered_env_vars& vars, const std::string& key, const std::string& value) {
    auto it = find_var(vars, key);
    if (it != vars.end()) {
        it->second = value;
    } else {
        vars.emplace_back(key, value);
    }
}

// Check if a variable exists
inline bool has_var(const ordered_env_vars& vars, const std::string& key) {
    return find_var(vars, key) != vars.end();
}

// Merge variables from another ordered_env_vars (appends new, skips existing)
inline void merge_vars(ordered_env_vars& dest, const ordered_env_vars& src) {
    for (const auto& [key, value] : src) {
        if (!has_var(dest, key)) {
            dest.emplace_back(key, value);
        }
    }
}

// Clear all variables
inline void clear_vars(ordered_env_vars& vars) {
    vars.clear();
}

} // namespace dropshell

#endif