#include "ConfigParser.h"

#include <fstream>
#include <iostream>
#include <algorithm>
#include <cctype>

using namespace std;

/** 清理字符串前后空格 */
void trim(std::string &s) {
	auto wsfront = std::find_if_not(s.begin(), s.end(), [](int c) {
		return std::isspace(c);
	});
	auto wsback = std::find_if_not(s.rbegin(), s.rend(), [](int c) {
		return std::isspace(c);
	}).base();
	s = (wsback <= wsfront) ? std::string() : std::string(wsfront, wsback);
}

CPStatus configFromIni(const std::string &path, std::unordered_map<std::string, std::string> &config) {
	CPStatus result = CPSUCCESS;
	//打开文件
	ifstream file(path);
	if (!file.is_open()) {
		result = CPFILE;
		return result;
	}
	// 一次性读取整个文件（减少I/O操作）
	file.seekg(0, std::ios::end);
	size_t size = file.tellg();
	file.seekg(0, std::ios::beg);
	string m_buffer;
	m_buffer.resize(size);
	file.read(&m_buffer[0], static_cast<long long>(size));
	//处理全部数据
	config.clear();
	std::string line;
	line.reserve(256);  // 预分配行缓存
	for (auto it = m_buffer.cbegin(); it != m_buffer.cend();) {
		// 快速跳过空白行
		while (it != m_buffer.cend() && (*it == '\r' || *it == '\n')) { ++it; }
		if (it == m_buffer.cend()) break;
		
		// 获取行内容
		line.clear();
		while (it != m_buffer.cend() && *it != '\r' && *it != '\n' && *it != '\0') {
			line += *it++;
		}
		//处理行内容
		// 跳过空行和注释
		if (line.empty() || line[0] == ';' || line[0] == '#') {
			++it;
			continue;
		}
		
		// 分割键值对
		size_t eq_pos = line.find('=');
		if (eq_pos != std::string::npos) {
			std::string key = line.substr(0, eq_pos);
			std::string value = line.substr(eq_pos + 1);
			trim(key);
			trim(value);
			if (!key.empty()) {
				config[key] = value; // 移动语义自动优化
			}
		}
	}
	return result;
}