//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
//SPDX-License-Identifier: GPL-3.0-or-later

#include "helpers.h"

#include "iostream"
#include <functional>

#include "config.h"

static bool installed = false;
static std::filesystem::path sPath;

bool isSpace(char ch){
    return std::isspace(static_cast<unsigned char>(ch));
}

void setAbsoluteSharedPath () {
    installed = true;
    sPath = FULL_DATA_DIR "/" PROJECT_NAME;             // should be something like /usr/share/pica or /local/usr/share/pica
}

void initPaths(const char* programPath) {
    std::filesystem::path pp(programPath);
    if (pp.filename() == programPath)
        return setAbsoluteSharedPath();

    std::filesystem::path cp;
    try {
        cp = std::filesystem::canonical(pp);
    } catch (const std::filesystem::filesystem_error& e) {
        setAbsoluteSharedPath();
        return;
    }

    if (cp.parent_path() == FULL_BIN_DIR)
        return setAbsoluteSharedPath();

    //std::cout << cp << std::endl;
    std::filesystem::path parent = cp.parent_path();
    if (endsWith(parent.string(), BIN_DIR)) {       //this is the case when the program is installed somewhere but not system root
        std::filesystem::path bin(BIN_DIR);         //so it will read from something like ../share/pica/ relative to the binary
        for (const auto& hop : bin) {
            UNUSED(hop);                            //I do this just to make as many ups as many members are in bin
            parent = parent.parent_path();
        }
        sPath = parent / DATA_DIR / PROJECT_NAME;
    } else {
        sPath = parent / DATA_DIR;                  //this should read something like ./share relative to the binary
    }
}

const std::filesystem::path& sharedPath() {
    return sPath;
}

bool endsWith(const std::string& string, const std::string& query) {
    std::string::size_type sl = string.length();
    std::string::size_type ql = query.length();
    if (sl >= ql) {
        unsigned int result = string.compare(sl - ql, ql, query);
        return result == 0;
    } else {
        return false;
    }
}

void ltrim(std::string& string) {
    string.erase(
        string.begin(),
        std::find_if(
            string.begin(),
            string.end(),
            std::not_fn(isSpace)
        )
    );
}

void rtrim(std::string& string) {
    string.erase(
        std::find_if(
            string.rbegin(),
            string.rend(),
            std::not_fn(isSpace)
        ).base(),
        string.end()
    );
}

void trim(std::string& string) {
    ltrim(string);
    rtrim(string);
}

std::string extract(std::string& string, std::string::size_type begin, std::string::size_type end) {
    std::string result = string.substr(begin, end);
    if (end == std::string::npos)
        string.erase(begin, end);
    else
        string.erase(begin, result.length() + 1);

    return result;
}