/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.

For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
*/
#include "info/boosts/create_giveaway_box.h"

#include "api/api_premium.h"
#include "boxes/peers/edit_participants_box.h" // ParticipantsBoxController
#include "data/data_peer.h"
#include "data/data_subscription_option.h"
#include "data/data_user.h"
#include "info/boosts/giveaway/giveaway_type_row.h"
#include "info/info_controller.h"
#include "lang/lang_keys.h"
#include "payments/payments_checkout_process.h" // Payments::CheckoutProcess
#include "payments/payments_form.h" // Payments::InvoicePremiumGiftCode
#include "settings/settings_common.h"
#include "settings/settings_premium.h" // Settings::ShowPremium
#include "ui/effects/premium_graphics.h"
#include "ui/layers/generic_box.h"
#include "ui/text/text_utilities.h"
#include "ui/widgets/checkbox.h"
#include "ui/widgets/labels.h"
#include "styles/style_layers.h"
#include "styles/style_premium.h"
#include "styles/style_settings.h"

namespace {

class MembersListController : public ParticipantsBoxController {
public:
	using ParticipantsBoxController::ParticipantsBoxController;

	void rowClicked(not_null<PeerListRow*> row) override;
	std::unique_ptr<PeerListRow> createRow(
		not_null<PeerData*> participant) const override;
	base::unique_qptr<Ui::PopupMenu> rowContextMenu(
		QWidget *parent,
		not_null<PeerListRow*> row) override;

};

void MembersListController::rowClicked(not_null<PeerListRow*> row) {
	delegate()->peerListSetRowChecked(row, !row->checked());
}

std::unique_ptr<PeerListRow> MembersListController::createRow(
		not_null<PeerData*> participant) const {
	const auto user = participant->asUser();
	if (!user || user->isInaccessible() || user->isBot() || user->isSelf()) {
		return nullptr;
	}
	return std::make_unique<PeerListRow>(participant);
}

base::unique_qptr<Ui::PopupMenu> MembersListController::rowContextMenu(
		QWidget *parent,
		not_null<PeerListRow*> row) {
	return nullptr;
}

} // namespace

void CreateGiveawayBox(
		not_null<Ui::GenericBox*> box,
		not_null<Info::Controller*> controller,
		not_null<PeerData*> peer) {
	using GiveawayType = Giveaway::GiveawayTypeRow::Type;
	using GiveawayGroup = Ui::RadioenumGroup<GiveawayType>;
	struct State final {
		State(not_null<PeerData*> p) : apiOptions(p) {
		}

		Api::PremiumGiftCodeOptions apiOptions;
		rpl::lifetime lifetimeApi;

		std::vector<not_null<PeerData*>> selectedToAward;
		rpl::event_stream<> toAwardAmountChanged;

		rpl::variable<GiveawayType> typeValue;

		bool confirmButtonBusy = false;
	};
	const auto state = box->lifetime().make_state<State>(peer);
	const auto typeGroup = std::make_shared<GiveawayGroup>();

	box->setWidth(st::boxWideWidth);

	{
		const auto row = box->verticalLayout()->add(
			object_ptr<Giveaway::GiveawayTypeRow>(
				box,
				GiveawayType::Random,
				tr::lng_giveaway_create_subtitle()));
		row->addRadio(typeGroup);
		row->setClickedCallback([=] {
			state->typeValue.force_assign(GiveawayType::Random);
		});
	}
	{
		const auto row = box->verticalLayout()->add(
			object_ptr<Giveaway::GiveawayTypeRow>(
				box,
				GiveawayType::SpecificUsers,
				state->toAwardAmountChanged.events_starting_with(
					rpl::empty_value()
				) | rpl::map([=] {
					const auto &selected = state->selectedToAward;
					return selected.empty()
						? tr::lng_giveaway_award_subtitle()
						: (selected.size() == 1)
						? rpl::single(selected.front()->name())
						: tr::lng_giveaway_award_chosen(
							lt_count,
							rpl::single(selected.size()) | tr::to_count());
				}) | rpl::flatten_latest()));
		row->addRadio(typeGroup);
		row->setClickedCallback([=] {
			auto initBox = [=](not_null<PeerListBox*> peersBox) {
				peersBox->setTitle(tr::lng_giveaway_award_option());
				peersBox->addButton(tr::lng_settings_save(), [=] {
					state->selectedToAward = peersBox->collectSelectedRows();
					state->toAwardAmountChanged.fire({});
					peersBox->closeBox();
				});
				peersBox->addButton(tr::lng_cancel(), [=] {
					peersBox->closeBox();
				});
				peersBox->boxClosing(
				) | rpl::start_with_next([=] {
					state->typeValue.force_assign(
						state->selectedToAward.empty()
							? GiveawayType::Random
							: GiveawayType::SpecificUsers);
				}, peersBox->lifetime());
			};

			box->uiShow()->showBox(
				Box<PeerListBox>(
					std::make_unique<MembersListController>(
						controller,
						peer,
						ParticipantsRole::Members),
					std::move(initBox)),
				Ui::LayerOption::KeepOther);
		});
	}

	Settings::AddSkip(box->verticalLayout());
	Settings::AddDivider(box->verticalLayout());
	Settings::AddSkip(box->verticalLayout());

	const auto durationGroup = std::make_shared<Ui::RadiobuttonGroup>(0);
	{
		const auto listOptions = box->verticalLayout()->add(
			object_ptr<Ui::VerticalLayout>(box));
		const auto rebuildListOptions = [=](int amountUsers) {
			while (listOptions->count()) {
				delete listOptions->widgetAt(0);
			}
			Settings::AddSubsectionTitle(
				listOptions,
				tr::lng_giveaway_duration_title(
					lt_count,
					rpl::single(amountUsers) | tr::to_count()));
			Ui::Premium::AddGiftOptions(
				listOptions,
				durationGroup,
				state->apiOptions.options(amountUsers),
				st::giveawayGiftCodeGiftOption,
				true);

			auto terms = object_ptr<Ui::FlatLabel>(
				listOptions,
				tr::lng_premium_gift_terms(
					lt_link,
					tr::lng_premium_gift_terms_link(
					) | rpl::map([](const QString &t) {
						return Ui::Text::Link(t, 1);
					}),
					Ui::Text::WithEntities),
				st::boxDividerLabel);
			terms->setLink(1, std::make_shared<LambdaClickHandler>([=] {
				box->closeBox();
				Settings::ShowPremium(&peer->session(), QString());
			}));
			listOptions->add(object_ptr<Ui::DividerLabel>(
				listOptions,
				std::move(terms),
				st::settingsDividerLabelPadding));

			listOptions->resizeToWidth(box->width());
		};

		state->typeValue.value(
		) | rpl::start_with_next([=](GiveawayType type) {
			typeGroup->setValue(type);
			const auto rebuild = [=] {
				rebuildListOptions((type == GiveawayType::SpecificUsers)
					? state->selectedToAward.size()
					: 1);
			};
			if (!listOptions->count()) {
				state->lifetimeApi = state->apiOptions.request(
				) | rpl::start_with_error_done([=](const QString &error) {
				}, rebuild);
			} else {
				rebuild();
			}
		}, box->lifetime());
		state->lifetimeApi = state->apiOptions.request(
		) | rpl::start_with_error_done([=](const QString &error) {
		}, [=] {
			rebuildListOptions(1);
		});
	}
	{
		// TODO mini-icon.
		const auto &stButton = st::premiumGiftBox;
		box->setStyle(stButton);
		auto button = object_ptr<Ui::RoundButton>(
			box,
			state->toAwardAmountChanged.events_starting_with(
				rpl::empty_value()
			) | rpl::map([=] {
				return (typeGroup->value() == GiveawayType::SpecificUsers)
					? tr::lng_giveaway_award()
					: tr::lng_giveaway_start();
			}) | rpl::flatten_latest(),
			st::giveawayGiftCodeStartButton);
		button->setTextTransform(Ui::RoundButton::TextTransform::NoTransform);
		button->resizeToWidth(box->width()
			- stButton.buttonPadding.left()
			- stButton.buttonPadding.right());
		button->setClickedCallback([=] {
			if (state->confirmButtonBusy) {
				return;
			}
			if (typeGroup->value() == GiveawayType::SpecificUsers) {
				if (state->selectedToAward.empty()) {
					return;
				}
				auto invoice = state->apiOptions.invoice(
					state->selectedToAward.size(),
					durationGroup->value());
				invoice.purpose = Payments::InvoicePremiumGiftCodeUsers{
					ranges::views::all(
						state->selectedToAward
					) | ranges::views::transform([](
							const not_null<PeerData*> p) {
						return not_null{ p->asUser() };
					}) | ranges::to_vector,
					peer->asChannel(),
				};
				state->confirmButtonBusy = true;
				Payments::CheckoutProcess::Start(
					std::move(invoice),
					crl::guard(box, [=](auto) {
						state->confirmButtonBusy = false;
						box->window()->setFocus();
					}));
			}
		});
		box->addButton(std::move(button));
	}
	state->typeValue.force_assign(GiveawayType::Random);
}