#include "shellUtils.h"

#include <iostream>
#include <string>
#include <map>
#include <cstdlib>
#include <filesystem>

namespace sh
{
    Command getCommand(std::string_view input)
    {
        if (commandMap.contains(input.
            substr(0, input.find(' '))))
        {
            return commandMap.at(input.substr(0, input.find(' ')));
        }
        else
        {
            return Command::unknown;
        }
    }

    std::optional<std::filesystem::path> isExec(const std::string& input)
    {

        const std::string_view pathEnv {std::getenv("PATH")};
#if WIN32
        constexpr char delimiter {';'};
#else
        constexpr char delimiter {':'};
#endif
        size_t startCharIndex{};
        size_t nextDelimIndex{pathEnv.find(delimiter)};
        while (nextDelimIndex != std::string::npos)
        {
            std::filesystem::path currentPath {pathEnv.substr(startCharIndex, nextDelimIndex - startCharIndex)};
            std::filesystem::path fullPath;
            fullPath = currentPath / input;
            namespace fs = std::filesystem;

            if (!fs::exists(fullPath))
            {
                startCharIndex = nextDelimIndex + 1;
                nextDelimIndex = pathEnv.find(delimiter, startCharIndex);
                continue;
            }

            if ((fs::status(fullPath).permissions() & fs::perms::owner_exec) != fs::perms::owner_exec)
            {
                startCharIndex = nextDelimIndex + 1;
                nextDelimIndex = pathEnv.find(delimiter, startCharIndex);
                continue;
            }

            return fullPath;
        }
        return std::nullopt;
    }

    void printType(const std::string& input)
    {
        if (commandMap.contains(input))
        {
            std::cout << input;
            std::cout << " is a shell builtin\n";
            return;
        }

        if (const auto fullPath {isExec(input)})
        {
            std::cout << input;
            std::cout << " is " << fullPath.value() << "\n";
            return;
        }

        std::cout << input;
        std::cout << ": not found\n";
    }
}