#pragma once

#include "ProjectBrowserModel.h"

#include "Support/StringEncoding.h"

#include <algorithm>
#include <cctype>
#include <string_view>
#include <system_error>

namespace XCEngine::UI::Editor::App::ProjectBrowserModelSupport {

inline constexpr std::string_view kAssetsRootId = "Assets";

inline std::string ToLowerCopy(std::string value) {
    std::transform(
        value.begin(),
        value.end(),
        value.begin(),
        [](unsigned char character) {
            return static_cast<char>(std::tolower(character));
        });
    return value;
}

inline std::string PathToUtf8String(const std::filesystem::path& path) {
    return Support::WideToUtf8(path.native());
}

inline std::string NormalizePathSeparators(std::string value) {
    std::replace(value.begin(), value.end(), '\\', '/');
    return value;
}

inline std::string BuildRelativeItemId(
    const std::filesystem::path& path,
    const std::filesystem::path& assetsRoot) {
    const std::filesystem::path relative =
        std::filesystem::relative(path, assetsRoot.parent_path());
    const std::string normalized =
        NormalizePathSeparators(PathToUtf8String(relative.lexically_normal()));
    return normalized.empty() ? std::string(kAssetsRootId) : normalized;
}

inline std::string BuildAssetDisplayName(const std::filesystem::path& path, bool directory) {
    if (directory) {
        return PathToUtf8String(path.filename());
    }

    const std::string filename = PathToUtf8String(path.filename());
    const std::size_t extensionOffset = filename.find_last_of('.');
    if (extensionOffset == std::string::npos || extensionOffset == 0u) {
        return filename;
    }

    return filename.substr(0u, extensionOffset);
}

inline bool IsMetaFile(const std::filesystem::path& path) {
    return ToLowerCopy(path.extension().string()) == ".meta";
}

inline bool HasChildDirectories(const std::filesystem::path& folderPath) {
    std::error_code errorCode = {};
    const std::filesystem::directory_iterator end = {};
    for (std::filesystem::directory_iterator iterator(folderPath, errorCode);
         !errorCode && iterator != end;
         iterator.increment(errorCode)) {
        if (iterator->is_directory(errorCode)) {
            return true;
        }
    }

    return false;
}

inline std::vector<std::filesystem::path> CollectSortedChildDirectories(
    const std::filesystem::path& folderPath) {
    std::vector<std::filesystem::path> paths = {};
    std::error_code errorCode = {};
    const std::filesystem::directory_iterator end = {};
    for (std::filesystem::directory_iterator iterator(folderPath, errorCode);
         !errorCode && iterator != end;
         iterator.increment(errorCode)) {
        if (iterator->is_directory(errorCode)) {
            paths.push_back(iterator->path());
        }
    }

    std::sort(
        paths.begin(),
        paths.end(),
        [](const std::filesystem::path& lhs, const std::filesystem::path& rhs) {
            return ToLowerCopy(PathToUtf8String(lhs.filename())) <
                ToLowerCopy(PathToUtf8String(rhs.filename()));
        });
    return paths;
}

} // namespace XCEngine::UI::Editor::App::ProjectBrowserModelSupport