#include "file_read_tool.hpp"

#include <fstream>

#include <sstream>

#include <filesystem>

#include <fmt/core.h>

namespace fs = std::filesystem;

namespace claw::tools {

std::string FileReadTool::get_name() const {

return "FileReadTool";

}

std::string FileReadTool::get_description() const {

return

"Reads the contents of a file at the specified path and returns "

"it as a string. Use this to inspect source code, configuration "

"files, logs, or any text file on the user's system.";

}

nlohmann::json FileReadTool::get_input_schema() const {

return {

{"type", "object"},

{"properties", {

{"path", {

{"type", "string"},

{"description", "Absolute or relative path to the file to read."}

}}

}},

{"required", nlohmann::json::array({"path"})}

};

}

std::string FileReadTool::execute(const nlohmann::json& input) {

if (!input.contains("path") || !input["path"].is_string()) {

return "[FileReadTool Error] Input must contain a 'path' string.";

}

std::string path = input["path"].get<std::string>();

if (!fs::exists(path)) {

return fmt::format("[FileReadTool Error] File not found: {}", path);

}

if (!fs::is_regular_file(path)) {

return fmt::format("[FileReadTool Error] Not a regular file: {}", path);

}

// Check file size — refuse to read files larger than 512 KB

auto file_size = fs::file_size(path);

if (file_size > 512 * 1024) {

return fmt::format(

"[FileReadTool Error] File is too large ({} bytes, max 524288). "

"Consider reading specific lines with BashTool instead.", file_size

);

}

std::ifstream file(path);

if (!file.is_open()) {

return fmt::format("[FileReadTool Error] Cannot open file: {}", path);

}

std::ostringstream ss;

ss << file.rdbuf();

return ss.str();

}

} // namespace claw::tools