#include "store/settings.hpp"

#include <array>
#include <utility>

#include <nlohmann/json.hpp>

namespace velox::daemon::store {

namespace {

// Built-in defaults, one per SettingKey (Settings.schema.json / SettingKey.schema.json).
// The schema itself carries no "default" keyword anywhere — these are what settings.get
// falls back to for a key with no stored row, chosen per ADR 0012 where it speaks (the
// connection.* buffer/segment keys) and otherwise the conservative, least-surprising
// value for that key's own description. capture.monitoredExtensions defaults to the union
// of every builtin category's extensions (0001_initial.sql's seed) rather than an
// arbitrary list of its own, so the two stay in sync without a second place to edit.
constexpr std::array<std::pair<std::string_view, std::string_view>, 43> kDefaults{{
    {"general.launchOnLogin", "false"},
    {"general.minimizeToTray", "false"},
    {"general.showDropTarget", "true"},
    {"general.confirmOnExit", "true"},
    {"general.language", "\"system\""},
    {"general.checkForUpdates", "true"},
    {"capture.enabled", "true"},
    {"capture.monitoredExtensions",
     "[\"exe\",\"msi\",\"deb\",\"rpm\",\"dmg\",\"appimage\",\"iso\",\"zip\",\"tar\",\"gz\","
     "\"xz\",\"7z\",\"mp4\",\"mkv\",\"webm\",\"avi\",\"mov\",\"flv\",\"m4v\",\"ts\",\"mp3\","
     "\"flac\",\"aac\",\"ogg\",\"opus\",\"wav\",\"m4a\",\"pdf\",\"doc\",\"docx\",\"xls\","
     "\"xlsx\",\"ppt\",\"pptx\",\"odt\",\"epub\",\"jpg\",\"jpeg\",\"png\",\"gif\",\"webp\","
     "\"svg\",\"bmp\",\"tiff\"]"},
    {"capture.monitoredMimeTypes", "[]"},
    {"capture.minSizeBytes", "0"},
    {"capture.excludedHosts", "[]"},
    {"capture.bypassModifier", "\"shift\""},
    {"capture.autoStartTypes", "[]"},
    {"saveTo.defaultDir", "\"~/Downloads\""},
    {"saveTo.tempDir", "\"\""},
    {"saveTo.allowedRoots", "[\"~/Downloads\"]"},
    {"saveTo.fileExistsPolicy", "\"ask\""},
    {"saveTo.createSubfolderPerSite", "false"},
    {"connection.preset", "\"auto\""},
    {"connection.maxSegmentsPerDownload", "8"},
    {"connection.bufferBytes", "1048576"},
    {"connection.maxTotalBufferBytes", "134217728"},
    {"connection.maxActiveSegments", "32"},
    {"connection.maxConcurrentDownloads", "5"},
    {"connection.timeoutSec", "30"},
    {"connection.maxRetries", "10"},
    {"connection.retryBackoffSec", "5"},
    {"downloads.speedLimitBps", "0"},
    {"downloads.speedLimitEnabled", "false"},
    {"downloads.virusScanCommand", "\"\""},
    {"downloads.postDownloadCommand", "\"\""},
    {"downloads.duplicatePolicy", "\"ask\""},
    {"downloads.verifyChecksums", "true"},
    {"proxy.mode", "\"system\""},
    {"proxy.host", "\"\""},
    {"proxy.port", "1"},
    {"proxy.username", "\"\""},
    {"proxy.bypassHosts", "[]"},
    {"proxy.pacUrl", "\"\""},
    {"sounds.enabled", "true"},
    {"sounds.onComplete", "\"\""},
    {"sounds.onQueueComplete", "\"\""},
    {"sounds.onError", "\"\""},
}};

}  // namespace

std::optional<std::string_view> Settings::default_for(std::string_view key) {
    for (const auto& [k, v] : kDefaults) {
        if (k == key) return v;
    }
    return std::nullopt;
}

DbResult<std::optional<std::string>> Settings::get_raw(std::string_view key) {
    auto st = db_.prepare("SELECT value FROM settings WHERE key = ?1");
    if (!st) return std::unexpected(st.error());
    if (auto r = st->bind(1, key); !r) return std::unexpected(r.error());
    auto row = st->step();
    if (!row) return std::unexpected(row.error());
    if (*row) return std::optional<std::string>{st->column_text(0)};
    if (auto d = default_for(key)) return std::optional<std::string>{std::string(*d)};
    return std::optional<std::string>{};
}

DbResult<void> Settings::set_raw(std::string_view key, std::string_view json_text) {
    auto st = db_.prepare(
        "INSERT INTO settings(key, value) VALUES(?1, ?2) "
        "ON CONFLICT(key) DO UPDATE SET value = excluded.value");
    if (!st) return std::unexpected(st.error());
    if (auto r = st->bind(1, key); !r) return std::unexpected(r.error());
    if (auto r = st->bind(2, json_text); !r) return std::unexpected(r.error());
    if (auto r = st->step(); !r) return std::unexpected(r.error());
    return {};
}

DbResult<std::map<std::string, std::string>> Settings::overrides() {
    auto st = db_.prepare("SELECT key, value FROM settings ORDER BY key");
    if (!st) return std::unexpected(st.error());
    std::map<std::string, std::string> out;
    for (;;) {
        auto row = st->step();
        if (!row) return std::unexpected(row.error());
        if (!*row) break;
        out.emplace(st->column_text(0), st->column_text(1));
    }
    return out;
}

std::int64_t Settings::get_int(std::string_view key) {
    auto raw = get_raw(key);
    if (raw && *raw) {
        auto j = nlohmann::json::parse(**raw, nullptr, false);
        if (j.is_number_integer()) return j.get<std::int64_t>();
    }
    if (auto d = default_for(key)) {
        auto j = nlohmann::json::parse(*d, nullptr, false);
        if (j.is_number_integer()) return j.get<std::int64_t>();
    }
    return 0;
}

bool Settings::get_bool(std::string_view key) {
    auto raw = get_raw(key);
    if (raw && *raw) {
        auto j = nlohmann::json::parse(**raw, nullptr, false);
        if (j.is_boolean()) return j.get<bool>();
    }
    if (auto d = default_for(key)) {
        auto j = nlohmann::json::parse(*d, nullptr, false);
        if (j.is_boolean()) return j.get<bool>();
    }
    return false;
}

std::string Settings::get_string(std::string_view key) {
    auto raw = get_raw(key);
    if (raw && *raw) {
        auto j = nlohmann::json::parse(**raw, nullptr, false);
        if (j.is_string()) return j.get<std::string>();
    }
    if (auto d = default_for(key)) {
        auto j = nlohmann::json::parse(*d, nullptr, false);
        if (j.is_string()) return j.get<std::string>();
    }
    return {};
}

std::vector<std::string> Settings::get_string_array(std::string_view key) {
    auto raw = get_raw(key);
    const std::string text = (raw && *raw) ? **raw
                             : default_for(key) ? std::string(*default_for(key))
                                                : std::string("[]");
    auto j = nlohmann::json::parse(text, nullptr, false);
    std::vector<std::string> out;
    if (j.is_array()) {
        for (const auto& e : j) {
            if (e.is_string()) out.push_back(e.get<std::string>());
        }
    }
    return out;
}

}  // namespace velox::daemon::store