#include "breeze/Text.hpp"

#include <cctype>

#include <algorithm>

namespace breeze::text
{

	std::string trim(std::string_view s)
	{
		std::size_t b = 0;
		std::size_t e = s.size();
		while (b < e && std::isspace(static_cast<unsigned char>(s[b])))
			++b;
		while (e > b && std::isspace(static_cast<unsigned char>(s[e - 1])))
			--e;
		return std::string(s.substr(b, e - b));
	}

	std::vector<std::string> split(std::string_view s, char delimiter)
	{
		std::vector<std::string> out;
		std::size_t start = 0;
		while (true)
		{
			std::size_t pos = s.find(delimiter, start);
			if (pos == std::string_view::npos)
			{
				out.emplace_back(s.substr(start));
				return out;
			}
			out.emplace_back(s.substr(start, pos - start));
			start = pos + 1;
		}
	}

	std::vector<std::string> splitLines(std::string_view s)
	{
		std::vector<std::string> lines = split(s, '\n');
		for (std::string& line : lines)
		{
			if (!line.empty() && line.back() == '\r')
				line.pop_back();
		}
		if (!lines.empty() && lines.back().empty())
			lines.pop_back();
		return lines;
	}

	std::string join(const std::vector<std::string>& parts, std::string_view separator)
	{
		std::string out;
		for (std::size_t i = 0; i < parts.size(); ++i)
		{
			if (i != 0)
				out += separator;
			out += parts[i];
		}
		return out;
	}

	std::string lower(std::string_view s)
	{
		std::string out(s);
		std::transform(out.begin(), out.end(), out.begin(),
					   [](unsigned char c) { return static_cast<char>(std::tolower(c)); });
		return out;
	}

	bool startsWith(std::string_view s, std::string_view prefix)
	{
		return s.size() >= prefix.size() && s.substr(0, prefix.size()) == prefix;
	}

	bool endsWith(std::string_view s, std::string_view suffix)
	{
		return s.size() >= suffix.size() && s.substr(s.size() - suffix.size()) == suffix;
	}

	std::string replaceAll(std::string s, std::string_view from, std::string_view to)
	{
		if (from.empty())
			return s;
		std::size_t pos = 0;
		while ((pos = s.find(from, pos)) != std::string::npos)
		{
			s.replace(pos, from.size(), to);
			pos += to.size();
		}
		return s;
	}

	std::string snakeCase(std::string_view s)
	{
		std::string out;
		for (std::size_t i = 0; i < s.size(); ++i)
		{
			unsigned char c = static_cast<unsigned char>(s[i]);
			if (c == '-' || c == ' ' || c == '.')
				c = '_';
			if (std::isupper(c))
			{
				bool prevLowerOrDigit =
					i > 0 && (std::islower(static_cast<unsigned char>(s[i - 1])) ||
							  std::isdigit(static_cast<unsigned char>(s[i - 1])));
				bool acronymEnds = i > 0 && std::isupper(static_cast<unsigned char>(s[i - 1])) &&
								   i + 1 < s.size() &&
								   std::islower(static_cast<unsigned char>(s[i + 1]));
				if ((prevLowerOrDigit || acronymEnds) && !out.empty() && out.back() != '_')
					out += '_';
				out += static_cast<char>(std::tolower(c));
			}
			else
			{
				if (c == '_' && (out.empty() || out.back() == '_'))
					continue;
				out += static_cast<char>(c);
			}
		}
		while (!out.empty() && out.back() == '_')
			out.pop_back();
		return out;
	}

	std::string normalized(std::string_view s)
	{
		std::string out;
		for (char c : s)
		{
			unsigned char u = static_cast<unsigned char>(c);
			if (std::isalnum(u))
				out += static_cast<char>(std::tolower(u));
		}
		return out;
	}

	bool isName(std::string_view s, bool allowDash)
	{
		if (s.empty() || !std::isalpha(static_cast<unsigned char>(s[0])))
			return false;
		return std::all_of(s.begin(), s.end(),
						   [allowDash](char c)
						   {
							   unsigned char u = static_cast<unsigned char>(c);
							   return std::isalnum(u) || c == '_' || (allowDash && c == '-');
						   });
	}

	bool isTargetId(std::string_view s)
	{
		if (s.empty() || !(std::isalpha(static_cast<unsigned char>(s[0])) || s[0] == '_'))
			return false;
		return std::all_of(s.begin(), s.end(),
						   [](char c)
						   {
							   unsigned char u = static_cast<unsigned char>(c);
							   return std::isalnum(u) || c == '_' || c == '.' || c == '+' ||
									  c == '-' || c == ':';
						   });
	}

	std::string orNone(std::string_view s)
	{
		return s.empty() ? std::string("<none>") : std::string(s);
	}

}