// SPDX-FileCopyrightText: 2021 Nheko Contributors
//
// SPDX-License-Identifier: GPL-3.0-or-later

#include "RoomSettings.h"

#include <QApplication>
#include <QFileDialog>
#include <QHBoxLayout>
#include <QImageReader>
#include <QMimeDatabase>
#include <QStandardPaths>
#include <QVBoxLayout>
#include <mtx/responses/common.hpp>
#include <mtx/responses/media.hpp>

#include "Cache.h"
#include "Config.h"
#include "Logging.h"
#include "MatrixClient.h"
#include "Utils.h"
#include "ui/TextField.h"

using namespace mtx::events;

EditModal::EditModal(const QString &roomId, QWidget *parent)
  : QWidget(parent)
  , roomId_{roomId}
{
        setAutoFillBackground(true);
        setAttribute(Qt::WA_DeleteOnClose, true);
        setWindowFlags(Qt::Tool | Qt::WindowStaysOnTopHint);
        setWindowModality(Qt::WindowModal);

        QFont largeFont;
        largeFont.setPointSizeF(largeFont.pointSizeF() * 1.4);
        setMinimumWidth(conf::window::minModalWidth);
        setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Maximum);

        auto layout = new QVBoxLayout(this);

        applyBtn_  = new QPushButton(tr("Apply"), this);
        cancelBtn_ = new QPushButton(tr("Cancel"), this);
        cancelBtn_->setDefault(true);

        auto btnLayout = new QHBoxLayout;
        btnLayout->addStretch(1);
        btnLayout->setSpacing(15);
        btnLayout->addWidget(cancelBtn_);
        btnLayout->addWidget(applyBtn_);

        nameInput_ = new TextField(this);
        nameInput_->setLabel(tr("Name").toUpper());
        topicInput_ = new TextField(this);
        topicInput_->setLabel(tr("Topic").toUpper());

        errorField_ = new QLabel(this);
        errorField_->setWordWrap(true);
        errorField_->hide();

        layout->addWidget(nameInput_);
        layout->addWidget(topicInput_);
        layout->addLayout(btnLayout, 1);

        auto labelLayout = new QHBoxLayout;
        labelLayout->setAlignment(Qt::AlignHCenter);
        labelLayout->addWidget(errorField_);
        layout->addLayout(labelLayout);

        connect(applyBtn_, &QPushButton::clicked, this, &EditModal::applyClicked);
        connect(cancelBtn_, &QPushButton::clicked, this, &EditModal::close);

        auto window = QApplication::activeWindow();

        if (window != nullptr) {
                auto center = window->frameGeometry().center();
                move(center.x() - (width() * 0.5), center.y() - (height() * 0.5));
        }
}

void
EditModal::topicEventSent(const QString &topic)
{
        errorField_->hide();
        emit topicChanged(topic);
        close();
}

void
EditModal::nameEventSent(const QString &name)
{
        errorField_->hide();
        emit nameChanged(name);
        close();
}

void
EditModal::error(const QString &msg)
{
        errorField_->setText(msg);
        errorField_->show();
}

void
EditModal::applyClicked()
{
        // Check if the values are changed from the originals.
        auto newName  = nameInput_->text().trimmed();
        auto newTopic = topicInput_->text().trimmed();

        errorField_->hide();

        if (newName == initialName_ && newTopic == initialTopic_) {
                close();
                return;
        }

        using namespace mtx::events;
        auto proxy = std::make_shared<ThreadProxy>();
        connect(proxy.get(), &ThreadProxy::topicEventSent, this, &EditModal::topicEventSent);
        connect(proxy.get(), &ThreadProxy::nameEventSent, this, &EditModal::nameEventSent);
        connect(proxy.get(), &ThreadProxy::error, this, &EditModal::error);

        if (newName != initialName_ && !newName.isEmpty()) {
                state::Name body;
                body.name = newName.toStdString();

                http::client()->send_state_event(
                  roomId_.toStdString(),
                  body,
                  [proxy, newName](const mtx::responses::EventId &, mtx::http::RequestErr err) {
                          if (err) {
                                  emit proxy->error(
                                    QString::fromStdString(err->matrix_error.error));
                                  return;
                          }

                          emit proxy->nameEventSent(newName);
                  });
        }

        if (newTopic != initialTopic_ && !newTopic.isEmpty()) {
                state::Topic body;
                body.topic = newTopic.toStdString();

                http::client()->send_state_event(
                  roomId_.toStdString(),
                  body,
                  [proxy, newTopic](const mtx::responses::EventId &, mtx::http::RequestErr err) {
                          if (err) {
                                  emit proxy->error(
                                    QString::fromStdString(err->matrix_error.error));
                                  return;
                          }

                          emit proxy->topicEventSent(newTopic);
                  });
        }
}

void
EditModal::setFields(const QString &roomName, const QString &roomTopic)
{
        initialName_  = roomName;
        initialTopic_ = roomTopic;

        nameInput_->setText(roomName);
        topicInput_->setText(roomTopic);
}

RoomSettings::RoomSettings(QString roomid, QObject *parent)
  : QObject(parent)
  , roomid_{std::move(roomid)}
{
        retrieveRoomInfo();

        // get room setting notifications
        http::client()->get_pushrules(
          "global",
          "override",
          roomid_.toStdString(),
          [this](const mtx::pushrules::PushRule &rule, mtx::http::RequestErr &err) {
                  if (err) {
                          if (err->status_code == 404)
                                  http::client()->get_pushrules(
                                    "global",
                                    "room",
                                    roomid_.toStdString(),
                                    [this](const mtx::pushrules::PushRule &rule,
                                           mtx::http::RequestErr &err) {
                                            if (err) {
                                                    notifications_ = 2; // all messages
                                                    emit notificationsChanged();
                                                    return;
                                            }

                                            if (rule.enabled) {
                                                    notifications_ = 1; // mentions only
                                                    emit notificationsChanged();
                                            }
                                    });
                          return;
                  }

                  if (rule.enabled) {
                          notifications_ = 0; // muted
                          emit notificationsChanged();
                  } else {
                          notifications_ = 2; // all messages
                          emit notificationsChanged();
                  }
          });

        // access rules
        if (info_.join_rule == state::JoinRule::Public) {
                if (info_.guest_access) {
                        accessRules_ = 0;
                } else {
                        accessRules_ = 1;
                }
        } else {
                accessRules_ = 2;
        }
        emit accessJoinRulesChanged();
}

QString
RoomSettings::roomName() const
{
        return utils::replaceEmoji(QString::fromStdString(info_.name).toHtmlEscaped());
}

QString
RoomSettings::roomTopic() const
{
        return utils::replaceEmoji(utils::linkifyMessage(
          QString::fromStdString(info_.topic).toHtmlEscaped().replace("\n", "<br>")));
}

QString
RoomSettings::roomId() const
{
        return roomid_;
}

QString
RoomSettings::roomVersion() const
{
        return QString::fromStdString(info_.version);
}

bool
RoomSettings::isLoading() const
{
        return isLoading_;
}

QString
RoomSettings::roomAvatarUrl()
{
        return QString::fromStdString(info_.avatar_url);
}

int
RoomSettings::memberCount() const
{
        return info_.member_count;
}

void
RoomSettings::retrieveRoomInfo()
{
        try {
                usesEncryption_ = cache::isRoomEncrypted(roomid_.toStdString());
                info_           = cache::singleRoomInfo(roomid_.toStdString());
        } catch (const lmdb::error &) {
                nhlog::db()->warn("failed to retrieve room info from cache: {}",
                                  roomid_.toStdString());
        }
}

int
RoomSettings::notifications()
{
        return notifications_;
}

int
RoomSettings::accessJoinRules()
{
        return accessRules_;
}

bool
RoomSettings::respondsToKeyRequests()
{
        return usesEncryption_ && utils::respondsToKeyRequests(roomid_);
}

void
RoomSettings::changeKeyRequestsPreference(bool isOn)
{
        utils::setKeyRequestsPreference(roomid_, isOn);
        emit keyRequestsChanged();
}

void
RoomSettings::enableEncryption()
{
        if (usesEncryption_)
                return;

        const auto room_id = roomid_.toStdString();
        http::client()->enable_encryption(
          room_id, [room_id, this](const mtx::responses::EventId &, mtx::http::RequestErr err) {
                  if (err) {
                          int status_code = static_cast<int>(err->status_code);
                          nhlog::net()->warn("failed to enable encryption in room ({}): {} {}",
                                             room_id,
                                             err->matrix_error.error,
                                             status_code);
                          emit displayError(
                            tr("Failed to enable encryption: %1")
                              .arg(QString::fromStdString(err->matrix_error.error)));
                          usesEncryption_ = false;
                          emit encryptionChanged();
                          return;
                  }

                  nhlog::net()->info("enabled encryption on room ({})", room_id);
          });

        usesEncryption_ = true;
        emit encryptionChanged();
}

bool
RoomSettings::canChangeJoinRules() const
{
        try {
                return cache::hasEnoughPowerLevel({EventType::RoomJoinRules},
                                                  roomid_.toStdString(),
                                                  utils::localUser().toStdString());
        } catch (const lmdb::error &e) {
                nhlog::db()->warn("lmdb error: {}", e.what());
        }

        return false;
}

bool
RoomSettings::canChangeNameAndTopic() const
{
        try {
                return cache::hasEnoughPowerLevel({EventType::RoomName, EventType::RoomTopic},
                                                  roomid_.toStdString(),
                                                  utils::localUser().toStdString());
        } catch (const lmdb::error &e) {
                nhlog::db()->warn("lmdb error: {}", e.what());
        }

        return false;
}

bool
RoomSettings::canChangeAvatar() const
{
        try {
                return cache::hasEnoughPowerLevel(
                  {EventType::RoomAvatar}, roomid_.toStdString(), utils::localUser().toStdString());
        } catch (const lmdb::error &e) {
                nhlog::db()->warn("lmdb error: {}", e.what());
        }

        return false;
}

bool
RoomSettings::isEncryptionEnabled() const
{
        return usesEncryption_;
}

void
RoomSettings::openEditModal()
{
        retrieveRoomInfo();

        auto modal = new EditModal(roomid_);
        modal->setFields(QString::fromStdString(info_.name), QString::fromStdString(info_.topic));
        modal->raise();
        modal->show();
        connect(modal, &EditModal::nameChanged, this, [this](const QString &newName) {
                info_.name = newName.toStdString();
                emit roomNameChanged();
        });

        connect(modal, &EditModal::topicChanged, this, [this](const QString &newTopic) {
                info_.topic = newTopic.toStdString();
                emit roomTopicChanged();
        });
}

void
RoomSettings::changeNotifications(int currentIndex)
{
        notifications_ = currentIndex;

        std::string room_id = roomid_.toStdString();
        if (notifications_ == 0) {
                // mute room
                // delete old rule first, then add new rule
                mtx::pushrules::PushRule rule;
                rule.actions = {mtx::pushrules::actions::dont_notify{}};
                mtx::pushrules::PushCondition condition;
                condition.kind    = "event_match";
                condition.key     = "room_id";
                condition.pattern = room_id;
                rule.conditions   = {condition};

                http::client()->put_pushrules(
                  "global", "override", room_id, rule, [room_id](mtx::http::RequestErr &err) {
                          if (err)
                                  nhlog::net()->error("failed to set pushrule for room {}: {} {}",
                                                      room_id,
                                                      static_cast<int>(err->status_code),
                                                      err->matrix_error.error);
                          http::client()->delete_pushrules(
                            "global", "room", room_id, [room_id](mtx::http::RequestErr &) {});
                  });
        } else if (notifications_ == 1) {
                // mentions only
                // delete old rule first, then add new rule
                mtx::pushrules::PushRule rule;
                rule.actions = {mtx::pushrules::actions::dont_notify{}};
                http::client()->put_pushrules(
                  "global", "room", room_id, rule, [room_id](mtx::http::RequestErr &err) {
                          if (err)
                                  nhlog::net()->error("failed to set pushrule for room {}: {} {}",
                                                      room_id,
                                                      static_cast<int>(err->status_code),
                                                      err->matrix_error.error);
                          http::client()->delete_pushrules(
                            "global", "override", room_id, [room_id](mtx::http::RequestErr &) {});
                  });
        } else {
                // all messages
                http::client()->delete_pushrules(
                  "global", "override", room_id, [room_id](mtx::http::RequestErr &) {
                          http::client()->delete_pushrules(
                            "global", "room", room_id, [room_id](mtx::http::RequestErr &) {});
                  });
        }
}

void
RoomSettings::changeAccessRules(int index)
{
        using namespace mtx::events::state;

        auto guest_access = [](int index) -> state::GuestAccess {
                state::GuestAccess event;

                if (index == 0)
                        event.guest_access = state::AccessState::CanJoin;
                else
                        event.guest_access = state::AccessState::Forbidden;

                return event;
        }(index);

        auto join_rule = [](int index) -> state::JoinRules {
                state::JoinRules event;

                switch (index) {
                case 0:
                case 1:
                        event.join_rule = state::JoinRule::Public;
                        break;
                default:
                        event.join_rule = state::JoinRule::Invite;
                }

                return event;
        }(index);

        updateAccessRules(roomid_.toStdString(), join_rule, guest_access);
}

void
RoomSettings::updateAccessRules(const std::string &room_id,
                                const mtx::events::state::JoinRules &join_rule,
                                const mtx::events::state::GuestAccess &guest_access)
{
        isLoading_ = true;
        emit loadingChanged();

        http::client()->send_state_event(
          room_id,
          join_rule,
          [this, room_id, guest_access](const mtx::responses::EventId &,
                                        mtx::http::RequestErr err) {
                  if (err) {
                          nhlog::net()->warn("failed to send m.room.join_rule: {} {}",
                                             static_cast<int>(err->status_code),
                                             err->matrix_error.error);
                          emit displayError(QString::fromStdString(err->matrix_error.error));
                          isLoading_ = false;
                          emit loadingChanged();
                          return;
                  }

                  http::client()->send_state_event(
                    room_id,
                    guest_access,
                    [this](const mtx::responses::EventId &, mtx::http::RequestErr err) {
                            if (err) {
                                    nhlog::net()->warn("failed to send m.room.guest_access: {} {}",
                                                       static_cast<int>(err->status_code),
                                                       err->matrix_error.error);
                                    emit displayError(
                                      QString::fromStdString(err->matrix_error.error));
                            }

                            isLoading_ = false;
                            emit loadingChanged();
                    });
          });
}

void
RoomSettings::stopLoading()
{
        isLoading_ = false;
        emit loadingChanged();
}

void
RoomSettings::avatarChanged()
{
        retrieveRoomInfo();
        emit avatarUrlChanged();
}

void
RoomSettings::updateAvatar()
{
        const QString picturesFolder =
          QStandardPaths::writableLocation(QStandardPaths::PicturesLocation);
        const QString fileName = QFileDialog::getOpenFileName(
          nullptr, tr("Select an avatar"), picturesFolder, tr("All Files (*)"));

        if (fileName.isEmpty())
                return;

        QMimeDatabase db;
        QMimeType mime = db.mimeTypeForFile(fileName, QMimeDatabase::MatchContent);

        const auto format = mime.name().split("/")[0];

        QFile file{fileName, this};
        if (format != "image") {
                emit displayError(tr("The selected file is not an image"));
                return;
        }

        if (!file.open(QIODevice::ReadOnly)) {
                emit displayError(tr("Error while reading file: %1").arg(file.errorString()));
                return;
        }

        isLoading_ = true;
        emit loadingChanged();

        // Events emitted from the http callbacks (different threads) will
        // be queued back into the UI thread through this proxy object.
        auto proxy = std::make_shared<ThreadProxy>();
        connect(proxy.get(), &ThreadProxy::error, this, &RoomSettings::displayError);
        connect(proxy.get(), &ThreadProxy::stopLoading, this, &RoomSettings::stopLoading);

        const auto bin        = file.peek(file.size());
        const auto payload    = std::string(bin.data(), bin.size());
        const auto dimensions = QImageReader(&file).size();

        // First we need to create a new mxc URI
        // (i.e upload media to the Matrix content repository) for the new avatar.
        http::client()->upload(
          payload,
          mime.name().toStdString(),
          QFileInfo(fileName).fileName().toStdString(),
          [proxy = std::move(proxy),
           dimensions,
           payload,
           mimetype = mime.name().toStdString(),
           size     = payload.size(),
           room_id  = roomid_.toStdString(),
           content  = std::move(bin)](const mtx::responses::ContentURI &res,
                                     mtx::http::RequestErr err) {
                  if (err) {
                          emit proxy->stopLoading();
                          emit proxy->error(
                            tr("Failed to upload image: %s")
                              .arg(QString::fromStdString(err->matrix_error.error)));
                          return;
                  }

                  using namespace mtx::events;
                  state::Avatar avatar_event;
                  avatar_event.image_info.w        = dimensions.width();
                  avatar_event.image_info.h        = dimensions.height();
                  avatar_event.image_info.mimetype = mimetype;
                  avatar_event.image_info.size     = size;
                  avatar_event.url                 = res.content_uri;

                  http::client()->send_state_event(
                    room_id,
                    avatar_event,
                    [content = std::move(content), proxy = std::move(proxy)](
                      const mtx::responses::EventId &, mtx::http::RequestErr err) {
                            if (err) {
                                    emit proxy->error(
                                      tr("Failed to upload image: %s")
                                        .arg(QString::fromStdString(err->matrix_error.error)));
                                    return;
                            }

                            emit proxy->stopLoading();
                    });
          });
}