// mcpp.fallback.config_migration — legacy index name migration.

//

// Older mcpp sandboxes used "mcpp-index" as the default index name.

// These helpers rename it to "mcpplibs" in config.toml and .xlings.json

// so xlings config/list output matches mcpp's default namespace.

export module mcpp.fallback.config_migration;

import std;

export namespace mcpp::fallback {

// Migrate config.toml: rename "mcpp-index" to "mcpplibs".

// Returns true if the file was modified.

bool migrate_config_toml_index_names(const std::filesystem::path& path);

// Migrate .xlings.json: rename "mcpp-index" to "mcpplibs".

// Returns true if the file was modified.

bool migrate_xlings_json_index_names(const std::filesystem::path& path);

} // namespace mcpp::fallback

namespace mcpp::fallback {

namespace {

bool replace_all(std::string& text, std::string_view from, std::string_view to) {

bool changed = false;

for (std::size_t pos = 0;

(pos = text.find(from, pos)) != std::string::npos;) {

text.replace(pos, from.size(), to);

pos += to.size();

changed = true;

}

return changed;

}

void write_file(const std::filesystem::path& p, std::string_view content) {

std::error_code ec;

std::filesystem::create_directories(p.parent_path(), ec);

std::ofstream os(p);

os << content;

}

bool write_text_if_changed(const std::filesystem::path& path,

const std::string& original,

const std::string& updated) {

if (updated == original) return false;

write_file(path, updated);

return true;

}

} // namespace

bool migrate_config_toml_index_names(const std::filesystem::path& path) {

std::ifstream is(path);

if (!is) return false;

std::stringstream ss;

ss << is.rdbuf();

auto original = ss.str();

auto updated = original;

replace_all(updated, "default = \"mcpp-index\"", "default = \"mcpplibs\"");

replace_all(updated, "[index.repos.\"mcpp-index\"]", "[index.repos.\"mcpplibs\"]");

return write_text_if_changed(path, original, updated);

}

bool migrate_xlings_json_index_names(const std::filesystem::path& path) {

std::ifstream is(path);

if (!is) return false;

std::stringstream ss;

ss << is.rdbuf();

auto original = ss.str();

auto updated = original;

replace_all(updated, "\"name\": \"mcpp-index\"", "\"name\": \"mcpplibs\"");

replace_all(updated, "\"name\":\"mcpp-index\"", "\"name\":\"mcpplibs\"");

return write_text_if_changed(path, original, updated);

}

} // namespace mcpp::fallback