/*
 * @file PhonebookModel.cpp
 * @author Robert Borzecki (robert.borzecki@mudita.com)
 * @date 10 wrz 2019
 * @brief
 * @copyright Copyright (C) 2019 mudita.com
 * @details
 */
#include "PhonebookModel.hpp"
#include "i18/i18.hpp"

#include "../widgets/PhonebookItem.hpp"
#include "service-db/api/DBServiceAPI.hpp"

PhonebookModel::PhonebookModel(app::Application *app) : DatabaseModel(app, 14)
{}

void PhonebookModel::requestRecordsCount()
{

    favouriteCount = DBServiceAPI::ContactGetCount(application, true);

    recordsCount = DBServiceAPI::ContactGetCount(application) + favouriteCount;

    // if there are favorite records request as much as possible
    uint32_t pageSize = this->pageSize;

    requestRecords(0, pageSize);
    if (static_cast<uint32_t>(recordsCount) > pageSize)
        requestRecords(pageSize, pageSize);
}

void PhonebookModel::requestRecords(const uint32_t offset, const uint32_t limit)
{

    if (offset < favouriteCount) {
        // if it's needed to request only favorite
        if (offset + limit < favouriteCount) {
            DBServiceAPI::ContactGetLimitOffset(application, offset, limit, true);
        }
        else {
            uint32_t count = favouriteCount - offset;
            DBServiceAPI::ContactGetLimitOffset(application, offset, count, true);
            DBServiceAPI::ContactGetLimitOffset(application, 0, limit - count, false);
        }
    }
    // request normal contacts
    else {
        DBServiceAPI::ContactGetLimitOffset(application, offset - favouriteCount, limit, false);
    }
}

bool PhonebookModel::updateRecords(std::unique_ptr<std::vector<ContactRecord>> records,
                                   const uint32_t offset,
                                   const uint32_t limit,
                                   uint32_t count,
                                   bool favourite)
{

    if (favourite)
        DatabaseModel::updateRecords(std::move(records), offset, limit, count);
    else
        DatabaseModel::updateRecords(std::move(records), offset + favouriteCount, limit, count);

    return true;
}

gui::ListItem *PhonebookModel::getItem(
    int index, int firstElement, int prevIndex, uint32_t count, int remaining, bool topDown)
{
    auto compareFirstChar = [&](std::shared_ptr<ContactRecord> contact, std::shared_ptr<ContactRecord> prevContact) {
        if (contact->primaryName.substr(0, 1) == prevContact->primaryName.substr(0, 1)) {
            return true;
        }
        else {
            return false;
        }
    };

    bool download = false;
    if (index > firstIndex + pageSize / 2)
        download = true;
    if (index < firstIndex - pageSize / 2)
        download = true;
    std::shared_ptr<ContactRecord> contact = getRecord(index, download);

    if (contact == nullptr)
        return nullptr;

    if (topDown) {
        // return item from favorite part of contacts
        if (static_cast<uint32_t>(index) < favouriteCount) {
            gui::PhonebookItem *item = new gui::PhonebookItem();

            if ((index == firstElement) && (index != prevIndex)) {
                item->setValue(utils::localize.get("app_phonebook_list_favourites"));
            }
            else {
                item->markFavourite(true);
                item->setContact(contact);
                item->setID(index);
            }
            return item;
        }
        else {
            gui::PhonebookItem *item = new gui::PhonebookItem();
            // on top the page or if element next after last favourite contact is requested
            if (((index == firstElement) || (static_cast<uint32_t>(index) == favouriteCount)) && (index != prevIndex)) {

                item->setValue(contact->primaryName.substr(0, 1));
            }
            else {
                std::shared_ptr<ContactRecord> prevContact = getRecord(prevIndex, false);
                if (compareFirstChar(contact, prevContact)) {
                    item->markFavourite(false);
                    item->setContact(contact);
                    item->setID(index);
                }
                else {
                    item->setValue(contact->primaryName.substr(0, 1));
                }
            }
            return item;
        }
    }
    else {
        if (static_cast<uint32_t>(index) < favouriteCount - 1) {
            gui::PhonebookItem *item = new gui::PhonebookItem();
            if (remaining == 0) {
                item->setValue(utils::localize.get("app_phonebook_list_favourites"));
            }
            else {
                item->markFavourite(true);
                item->setContact(contact);
                item->setID(index);
            }
            return item;
        }
        else {
            gui::PhonebookItem *item = new gui::PhonebookItem();

            // leaving normal contacts list and entering favourite area but character is already placed
            if ((static_cast<uint32_t>(index) == favouriteCount - 1) && (index == prevIndex)) {
                item->markFavourite(true);
                item->setContact(contact);
                item->setID(index);
            }
            // leaving normal contacts list and entering favourite area - return character
            if ((static_cast<uint32_t>(index) == favouriteCount - 1) && (index != prevIndex)) {
                item->setValue(contact->primaryName.substr(0, 1));
            }
            else {
                std::shared_ptr<ContactRecord> prevContact = getRecord(prevIndex, false);
                if (remaining == 0) {
                    // previous element has the same first character of alternative name so display first character
                    if (index == prevIndex) {
                        item->markFavourite(false);
                        item->setContact(contact);
                        item->setID(index);
                    }
                    else {
                        item->setValue(prevContact->primaryName.substr(0, 1));
                    }
                }
                else if (((index == firstElement) || (index == prevIndex) ||
                          (compareFirstChar(contact, prevContact)))) {
                    item->markFavourite(false);
                    item->setContact(contact);
                    item->setID(index);
                }
                else {
                    item->setValue(prevContact->primaryName.substr(0, 1));
                }
            }
            return item;
        }
    }
}