Tactiliest/Tactility/Source/app/timezone/TimeZone.cpp

#include "TimeZone.h"
#include "app/AppManifest.h"
#include "app/AppContext.h"
#include "service/loader/Loader.h"
#include "lvgl.h"
#include "lvgl/Toolbar.h"
#include "Partitions.h"
#include "TactilityHeadless.h"
#include "lvgl/LvglSync.h"
#include "service/gui/Gui.h"
#include <memory>
#include <StringUtils.h>
#include <Timer.h>

namespace tt::app::timezone {

#define TAG "timezone_select"

#define RESULT_BUNDLE_CODE_INDEX "code"
#define RESULT_BUNDLE_NAME_INDEX "name"

extern const AppManifest manifest;

struct TimeZoneEntry {
    std::string name;
    std::string code;
};

struct Data {
    Mutex mutex;
    std::vector<TimeZoneEntry> entries;
    std::unique_ptr<Timer> updateTimer;
    lv_obj_t* listWidget = nullptr;
    lv_obj_t* filterTextareaWidget = nullptr;
};

static void updateList(std::shared_ptr<Data>& data);

static bool parseEntry(const std::string& input, std::string& outName, std::string& outCode) {
    std::string partial_strip = input.substr(1, input.size() - 3);
    auto first_end_quote = partial_strip.find('"');
    if (first_end_quote == std::string::npos) {
        return false;
    } else {
        outName = partial_strip.substr(0, first_end_quote);
        outCode = partial_strip.substr(first_end_quote + 3);
        return true;
    }
}

// region Result

std::string getResultName(const Bundle& bundle) {
    std::string result;
    bundle.optString(RESULT_BUNDLE_NAME_INDEX, result);
    return result;
}

std::string getResultCode(const Bundle& bundle) {
    std::string result;
    bundle.optString(RESULT_BUNDLE_CODE_INDEX, result);
    return result;
}

void setResultName(std::shared_ptr<Bundle>& bundle, const std::string& name) {
    bundle->putString(RESULT_BUNDLE_NAME_INDEX, name);
}

void setResultCode(std::shared_ptr<Bundle>& bundle, const std::string& code) {
    bundle->putString(RESULT_BUNDLE_CODE_INDEX, code);
}

// endregion

static void onUpdateTimer(std::shared_ptr<void> context) {
    auto data = std::static_pointer_cast<Data>(context);
    updateList(data);
}

static void onTextareaValueChanged(TT_UNUSED lv_event_t* e) {
    auto* app = service::loader::getCurrentApp();
    auto app_data = app->getData();
    auto data = std::static_pointer_cast<Data>(app_data);

    if (data->mutex.lock(100 / portTICK_PERIOD_MS)) {
        if (data->updateTimer->isRunning()) {
            data->updateTimer->stop();
        }

        data->updateTimer->start(500 / portTICK_PERIOD_MS);

        data->mutex.unlock();
    }
}

static void onListItemSelected(lv_event_t* e) {
    auto index = reinterpret_cast<std::size_t>(lv_event_get_user_data(e));
    TT_LOG_I(TAG, "Selected item at index %zu", index);
    auto* app = service::loader::getCurrentApp();
    auto data = std::static_pointer_cast<Data>(app->getData());

    auto& entry = data->entries[index];

    auto bundle = std::make_shared<Bundle>();
    setResultName(bundle, entry.name);
    setResultCode(bundle, entry.code);
    app->setResult(app::ResultOk, bundle);

    service::loader::stopApp();
}

static void createListItem(lv_obj_t* list, const std::string& title, size_t index) {
    lv_obj_t* btn = lv_list_add_button(list, nullptr, title.c_str());
    lv_obj_add_event_cb(btn, &onListItemSelected, LV_EVENT_SHORT_CLICKED, (void*)index);
}

static void readTimeZones(const std::shared_ptr<Data>& data, std::string filter) {
    auto path = std::string(MOUNT_POINT_SYSTEM) + "/timezones.csv";
    auto* file = fopen(path.c_str(), "rb");
    if (file == nullptr) {
        TT_LOG_E(TAG, "Failed to open %s", path.c_str());
        return;
    }
    char line[96];
    std::string name;
    std::string code;
    uint32_t count = 0;
    std::vector<TimeZoneEntry> entries;
    while (fgets(line, 96, file)) {
        if (parseEntry(line, name, code)) {
            if (tt::string::lowercase(name).find(filter) != std::string::npos) {
                count++;
                entries.push_back({
                    .name = name,
                    .code = code
                });

                // Safety guard
                if (count > 50) {
                    // TODO: Show warning that we're not displaying a complete list
                    break;
                }
            }
        } else {
            TT_LOG_E(TAG, "Parse error at line %lu", count);
        }
    }

    fclose(file);

    if (data->mutex.lock(100 / portTICK_PERIOD_MS)) {
        data->entries = std::move(entries);
        data->mutex.unlock();
    } else {
        TT_LOG_E(TAG, LOG_MESSAGE_MUTEX_LOCK_FAILED);
    }

    TT_LOG_I(TAG, "Processed %lu entries", count);
}

static void updateList(std::shared_ptr<Data>& data) {
    if (lvgl::lock(100 / portTICK_PERIOD_MS)) {
        std::string filter = tt::string::lowercase(std::string(lv_textarea_get_text(data->filterTextareaWidget)));
        readTimeZones(data, filter);
        lvgl::unlock();
    } else {
        TT_LOG_E(TAG, LOG_MESSAGE_MUTEX_LOCK_FAILED_FMT, "LVGL");
        return;
    }

    if (lvgl::lock(100 / portTICK_PERIOD_MS)) {
        if (data->mutex.lock(100 / portTICK_PERIOD_MS)) {
            lv_obj_clean(data->listWidget);

            uint32_t index = 0;
            for (auto& entry : data->entries) {
                createListItem(data->listWidget, entry.name, index);
                index++;
            }

            data->mutex.unlock();
        }

        lvgl::unlock();
    }
}

static void onShow(AppContext& app, lv_obj_t* parent) {
    auto data = std::static_pointer_cast<Data>(app.getData());

    lv_obj_set_flex_flow(parent, LV_FLEX_FLOW_COLUMN);
    lvgl::toolbar_create(parent, app);

    auto* search_wrapper = lv_obj_create(parent);
    lv_obj_set_size(search_wrapper, LV_PCT(100), LV_SIZE_CONTENT);
    lv_obj_set_flex_flow(search_wrapper, LV_FLEX_FLOW_ROW);
    lv_obj_set_flex_align(search_wrapper, LV_FLEX_ALIGN_START, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_START);
    lv_obj_set_style_pad_all(search_wrapper, 0, 0);
    lv_obj_set_style_border_width(search_wrapper, 0, 0);

    auto* icon = lv_image_create(search_wrapper);
    lv_obj_set_style_margin_left(icon, 8, 0);
    lv_obj_set_style_image_recolor_opa(icon, 255, 0);
    lv_obj_set_style_image_recolor(icon, lv_theme_get_color_primary(parent), 0);

    std::string icon_path = app.getPaths()->getSystemPathLvgl("search.png");
    lv_image_set_src(icon, icon_path.c_str());
    lv_obj_set_style_image_recolor(icon, lv_theme_get_color_primary(parent), 0);

    auto* textarea = lv_textarea_create(search_wrapper);
    lv_textarea_set_placeholder_text(textarea, "e.g. Europe/Amsterdam");
    lv_textarea_set_one_line(textarea, true);
    lv_obj_add_event_cb(textarea, onTextareaValueChanged, LV_EVENT_VALUE_CHANGED, nullptr);
    data->filterTextareaWidget = textarea;
    lv_obj_set_flex_grow(textarea, 1);
    service::gui::keyboardAddTextArea(textarea);

    auto* list = lv_list_create(parent);
    lv_obj_set_width(list, LV_PCT(100));
    lv_obj_set_flex_grow(list, 1);
    lv_obj_set_style_border_width(list, 0, 0);
    data->listWidget = list;
}

static void onStart(AppContext& app) {
    auto data = std::make_shared<Data>();
    data->updateTimer = std::make_unique<Timer>(Timer::TypeOnce, onUpdateTimer, data);
    app.setData(data);
}

extern const AppManifest manifest = {
    .id = "TimeZone",
    .name = "Select timezone",
    .type = TypeHidden,
    .onStart = onStart,
    .onShow = onShow,
};

void start() {
    service::loader::startApp(manifest.id);
}

}