grim/src/gui/views/wallets/wallet/request/send.rs

// Copyright 2025 The Grim Developers
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use egui::{Id, RichText};
use grin_core::core::{amount_from_hr_string, amount_to_hr_string};
use grin_core::global::get_accept_fee_base;
use grin_wallet_libwallet::SlatepackAddress;

use crate::gui::Colors;
use crate::gui::platform::PlatformCallbacks;
use crate::gui::views::{CameraContent, Modal, TextEdit, View};
use crate::wallet::Wallet;
use crate::wallet::types::WalletTask;

/// Content to create a request to send funds.
pub struct SendRequestContent {
	/// Amount to send.
	amount_edit: String,
	/// Flag to check if maximum amount is calculating.
	pub max_calculating: bool,

	/// Fee amount.
	fee_edit: String,

	/// Receiver address.
	address_edit: String,
	/// Flag to check if entered address is incorrect.
	address_error: bool,

	/// Address QR code scanner content.
	address_scan_content: Option<CameraContent>,
}

impl SendRequestContent {
	/// Create new content instance with optional receiver address.
	pub fn new(addr: Option<String>) -> Self {
		Self {
			amount_edit: "".to_string(),
			max_calculating: false,
			fee_edit: "".to_string(),
			address_edit: addr.unwrap_or("".to_string()),
			address_error: false,
			address_scan_content: None,
		}
	}

	/// Setup fee amount.
	pub fn on_fee_calculated(&mut self, fee: u64) {
		self.fee_edit = amount_to_hr_string(fee, true);
	}

	/// Setup maximum amount to send and fee.
	pub fn on_max_amount_calculated(&mut self, amount: u64, fee: u64) {
		self.max_calculating = false;
		if amount == 0 {
			self.amount_edit = "".to_string();
			self.fee_edit = "".to_string();
		} else {
			self.amount_edit = amount_to_hr_string(amount, true);
			self.fee_edit = amount_to_hr_string(fee, true);
		}
	}

	/// Draw [`Modal`] content.
	pub fn ui(
		&mut self,
		ui: &mut egui::Ui,
		wallet: &Wallet,
		modal: &Modal,
		cb: &dyn PlatformCallbacks,
	) {
		let data = wallet.get_data();
		if data.is_none() {
			Modal::close();
			return;
		}
		let data = data.unwrap();

		ui.add_space(6.0);

		// Draw QR code scanner content if requested.
		if let Some(scanner) = self.address_scan_content.as_mut() {
			let on_stop = || {
				cb.stop_camera();
				modal.enable_closing();
			};

			if let Some(result) = scanner.qr_scan_result() {
				self.address_edit = result.text();
				on_stop();
				self.address_scan_content = None;
			} else {
				ui.add_space(6.0);
				scanner.ui(ui, cb);
				ui.add_space(6.0);

				// Setup spacing between buttons.
				ui.spacing_mut().item_spacing = egui::Vec2::new(8.0, 0.0);

				// Show buttons to close modal or come back to sending input.
				ui.columns(2, |cols| {
					cols[0].vertical_centered_justified(|ui| {
						View::button(ui, t!("close"), Colors::white_or_black(false), || {
							on_stop();
							self.close();
						});
					});
					cols[1].vertical_centered_justified(|ui| {
						View::button(ui, t!("back"), Colors::white_or_black(false), || {
							on_stop();
							self.address_scan_content = None;
						});
					});
				});
				ui.add_space(6.0);
			}
			return;
		}

		ui.vertical_centered(|ui| {
			let amount = amount_to_hr_string(data.info.amount_currently_spendable, true);
			let enter_text = t!("wallets.enter_amount_send","amount" => amount);
			ui.label(RichText::new(enter_text).size(17.0).color(Colors::gray()));
		});
		ui.add_space(8.0);

		// Draw amount text edit.
		let amount_edit_id = Id::from(modal.id)
			.with("amount")
			.with(wallet.get_config().id);
		let mut amount_edit = TextEdit::new(amount_edit_id)
			.h_center()
			.numeric()
			.focus(Modal::first_draw());
		if self.max_calculating {
			amount_edit = amount_edit.disable();
		}
		let amount_edit_before = self.amount_edit.clone();

		// Draw button to calculate maximum amount to send.
		let mut calculate_max = false;
		amount_edit.custom_buttons_ui(ui, &mut self.amount_edit, cb, |ui| {
			if self.max_calculating {
				ui.add_space(12.0);
				View::loading_spinner(ui, 40.0);
				ui.add_space(12.0);
			} else {
				View::button(ui, t!("max_short"), Colors::white_or_black(false), || {
					calculate_max = true;
				});
				ui.add_space(8.0);
			}
		});
		if calculate_max {
			self.max_calculating = true;
			let max = data.info.amount_currently_spendable;
			self.amount_edit = amount_to_hr_string(max, true);
		}
		ui.add_space(8.0);

		// Check value if input was changed.
		if amount_edit_before != self.amount_edit {
			if !self.amount_edit.is_empty() {
				// Trim text, replace `,` by `.` and parse amount.
				self.amount_edit = self.amount_edit.trim().replace(",", ".");
				match amount_from_hr_string(self.amount_edit.as_str()) {
					Ok(mut amount) => {
						if !self.amount_edit.contains(".") {
							// To avoid input of several `0` before `.` and put `.` after first `0`.
							if self.amount_edit.len() != 1 && self.amount_edit.starts_with("0") {
								let amount_text = amount_to_hr_string(amount, true);
								let amount_parts = amount_text.split(".").collect::<Vec<&str>>();
								self.amount_edit = format!("0.{}", amount_parts[0]);
								amount = amount_from_hr_string(self.amount_edit.as_str())
									.unwrap_or_else(|_| amount);
								amount_edit.cursor_to_end(self.amount_edit.len(), ui);
							}
							// Reset fee amount on `0`.
							if amount == 0 {
								self.fee_edit = "".to_string();
							}
						} else {
							// Check input after `.`.
							let parts = self.amount_edit.split(".").collect::<Vec<&str>>();
							if parts.len() == 2
								&& (parts[1].len() > 9 || (amount == 0 && parts[1].len() > 8))
							{
								self.amount_edit = amount_edit_before.clone();
							}
						}
						// Do not input amount more than balance.
						if amount != 0 && self.amount_edit != amount_edit_before {
							let fee = amount_from_hr_string(self.fee_edit.as_str()).unwrap_or(0);
							let max = data.info.amount_currently_spendable;
							if amount > max || amount + fee > max {
								self.max_calculating = true;
								wallet.task(WalletTask::CalculateFee(max, 0));
							} else {
								wallet.task(WalletTask::CalculateFee(amount, 0));
							}
						}
					}
					Err(_) => {
						self.amount_edit = amount_edit_before;
					}
				}
			} else {
				self.fee_edit = "".to_string();
			}
		}

		// Show fee value.
		ui.vertical_centered(|ui| {
			let fee_label = t!(
				"wallets.fee_base_desc",
				"value" => format!(": {}", get_accept_fee_base())
			);
			ui.label(RichText::new(fee_label).size(17.0).color(Colors::gray()));
		});
		ui.add_space(6.0);
		let fee_edit_id = Id::from(modal.id).with("_fee").with(wallet.get_config().id);
		let mut fee_edit = TextEdit::new(fee_edit_id).focus(false).h_center().disable();
		let mut loading_label = format!("{}...", t!("wallets.loading"));
		fee_edit.ui(
			ui,
			if wallet.fee_calculating() {
				&mut loading_label
			} else {
				&mut self.fee_edit
			},
			cb,
		);

		ui.add_space(8.0);

		// Show address error or input description.
		ui.vertical_centered(|ui| {
			if self.address_error {
				ui.label(
					RichText::new(t!("transport.incorrect_addr_err"))
						.size(17.0)
						.color(Colors::red()),
				);
			} else {
				ui.label(
					RichText::new(t!("transport.receiver_address"))
						.size(17.0)
						.color(Colors::gray()),
				);
			}
		});
		ui.add_space(6.0);

		// Show address text edit.
		let addr_edit_before = self.address_edit.clone();
		let address_edit_id = Id::from(modal.id)
			.with("_address")
			.with(wallet.get_config().id);
		let mut address_edit = TextEdit::new(address_edit_id)
			.paste()
			.focus(false)
			.scan_qr();
		if amount_edit.enter_pressed {
			address_edit.focus_request();
		}
		address_edit.ui(ui, &mut self.address_edit, cb);
		// Check if scan button was pressed.
		if address_edit.scan_pressed {
			modal.disable_closing();
			self.address_scan_content = Some(CameraContent::default());
		}
		ui.add_space(12.0);
		// Check value if input was changed.
		if addr_edit_before != self.address_edit {
			self.address_error = false;
		}
		// Continue on Enter press.
		if address_edit.enter_pressed {
			self.on_continue(wallet);
		}

		// Setup spacing between buttons.
		ui.spacing_mut().item_spacing = egui::Vec2::new(8.0, 0.0);

		ui.columns(2, |columns| {
			columns[0].vertical_centered_justified(|ui| {
				View::button(
					ui,
					t!("modal.cancel"),
					Colors::white_or_black(false),
					|| {
						self.close();
					},
				);
			});
			columns[1].vertical_centered_justified(|ui| {
				// Button to create Slatepack message request.
				if self.max_calculating || wallet.fee_calculating() {
					ui.add_space(4.0);
					View::small_loading_spinner(ui);
				} else {
					View::button(ui, t!("continue"), Colors::white_or_black(false), || {
						self.on_continue(wallet);
					});
				}
			});
		});
		ui.add_space(6.0);
	}

	/// Callback when Continue button was pressed.
	fn on_continue(&mut self, wallet: &Wallet) {
		if self.amount_edit.is_empty() {
			return;
		}
		// Check address to send over Tor if enabled.
		let addr_str = self.address_edit.as_str();
		if let Ok(r) = SlatepackAddress::try_from(addr_str.trim()) {
			if let Ok(a) = amount_from_hr_string(self.amount_edit.as_str()) {
				wallet.task(WalletTask::Send(a, Some(r)));
				Modal::close();
			}
		} else if !addr_str.is_empty() {
			self.address_error = true;
		} else if let Ok(a) = amount_from_hr_string(self.amount_edit.as_str()) {
			wallet.task(WalletTask::Send(a, None));
			Modal::close();
		}
	}

	/// Close modal and clear data.
	fn close(&mut self) {
		self.amount_edit = "".to_string();
		self.address_edit = "".to_string();
		self.address_scan_content = None;
		Modal::close();
	}
}