// Copyright 2023 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::RichText;
use egui::os::OperatingSystem;
use lazy_static::lazy_static;
use std::fs;
use std::sync::atomic::{AtomicBool, Ordering};

use crate::gui::Colors;
use crate::gui::icons::FILE_X;
use crate::gui::platform::PlatformCallbacks;
use crate::gui::views::network::NetworkContent;
use crate::gui::views::types::{ContentContainer, ModalPosition};
use crate::gui::views::wallets::WalletsContent;
use crate::gui::views::{Modal, View};
use crate::node::Node;
use crate::{AppConfig, Settings};

lazy_static! {
	/// Global state to check if [`NetworkContent`] panel is open.
	static ref NETWORK_PANEL_OPEN: AtomicBool = AtomicBool::new(false);
}

/// Contains main ui content, handles side panel state.
pub struct Content {
	/// Side panel [`NetworkContent`] content.
	network: NetworkContent,

	/// Central panel [`WalletsContent`] content.
	wallets: WalletsContent,

	/// Check if app exit is allowed on Desktop close event.
	pub exit_allowed: bool,
	/// Flag to show exit progress at [`Modal`].
	show_exit_progress: bool,

	/// Flag to check it's first draw of content.
	first_draw: bool,
}

impl Default for Content {
	fn default() -> Self {
		// Exit from eframe only for non-mobile platforms.
		let os = OperatingSystem::from_target_os();
		let exit_allowed = os == OperatingSystem::Android || os == OperatingSystem::IOS;
		Self {
			network: NetworkContent::default(),
			wallets: WalletsContent::default(),
			exit_allowed,
			show_exit_progress: false,
			first_draw: true,
		}
	}
}

/// Identifier for integrated node warning [`Modal`] on Android.
const ANDROID_INTEGRATED_NODE_WARNING_MODAL: &'static str = "android_node_warning_modal";
/// Identifier for crash report [`Modal`].
const CRASH_REPORT_MODAL: &'static str = "crash_report_modal";

impl ContentContainer for Content {
	fn modal_ids(&self) -> Vec<&'static str> {
		vec![
			Self::EXIT_CONFIRMATION_MODAL,
			ANDROID_INTEGRATED_NODE_WARNING_MODAL,
			CRASH_REPORT_MODAL,
		]
	}

	fn modal_ui(&mut self, ui: &mut egui::Ui, modal: &Modal, cb: &dyn PlatformCallbacks) {
		match modal.id {
			Self::EXIT_CONFIRMATION_MODAL => self.exit_modal_content(ui, modal, cb),
			ANDROID_INTEGRATED_NODE_WARNING_MODAL => self.android_warning_modal_ui(ui),
			CRASH_REPORT_MODAL => self.crash_report_modal_ui(ui, cb),
			_ => {}
		}
	}

	fn container_ui(&mut self, ui: &mut egui::Ui, cb: &dyn PlatformCallbacks) {
		let dual_panel = Self::is_dual_panel_mode(ui.ctx());
		let (is_panel_open, mut panel_width) = network_panel_state_width(ui.ctx(), dual_panel);
		if self.network.showing_settings() {
			panel_width = ui.available_width();
		}

		// Show network content.
		egui::SidePanel::left("network_panel")
			.resizable(false)
			.exact_width(panel_width)
			.frame(egui::Frame {
				..Default::default()
			})
			.show_animated_inside(ui, is_panel_open, |ui| {
				self.network.ui(ui, cb);
			});

		// Show wallets content.
		egui::CentralPanel::default()
			.frame(egui::Frame {
				..Default::default()
			})
			.show_inside(ui, |ui| {
				self.wallets.ui(ui, cb);
			});

		if self.first_draw {
			// Show crash report or integrated node Android warning.
			if Settings::crash_check_path().exists() {
				Modal::new(CRASH_REPORT_MODAL)
					.closeable(false)
					.position(ModalPosition::Center)
					.title(t!("crash_report"))
					.show();
			} else if OperatingSystem::from_target_os() == OperatingSystem::Android
				&& AppConfig::android_integrated_node_warning_needed()
			{
				Modal::new(ANDROID_INTEGRATED_NODE_WARNING_MODAL)
					.title(t!("network.node"))
					.show();
			}
			self.first_draw = false;
		}
	}
}

impl Content {
	/// Default width of side panel at application UI.
	pub const SIDE_PANEL_WIDTH: f32 = 400.0;
	/// Desktop window title height.
	pub const WINDOW_TITLE_HEIGHT: f32 = 38.0;
	/// Margin of window frame at desktop.
	pub const WINDOW_FRAME_MARGIN: f32 = 6.0;

	/// Identifier for exit confirmation [`Modal`].
	pub const EXIT_CONFIRMATION_MODAL: &'static str = "exit_confirmation_modal";

	/// Called to navigate back, return `true` if action was not consumed.
	pub fn on_back(&mut self, ctx: &egui::Context, cb: &dyn PlatformCallbacks) -> bool {
		if Modal::on_back() {
			let dual_panel = Self::is_dual_panel_mode(ctx);
			if !dual_panel && Self::is_network_panel_open() {
				if self.network.on_back() {
					Self::toggle_network_panel();
					return false;
				}
			} else if self.wallets.on_back(cb) {
				Self::show_exit_modal();
				return false;
			}
		}
		true
	}

	/// Check if ui can show [`NetworkContent`] and [`WalletsContent`] at same time.
	pub fn is_dual_panel_mode(ctx: &egui::Context) -> bool {
		let (w, h) = View::window_size(ctx);
		// Screen is wide if width is greater than height or just 20% smaller.
		let is_wide_screen = w > h || w + (w * 0.2) >= h;
		// Dual panel mode is available when window is wide and its width is at least 2 times
		// greater than minimal width of the side panel plus display insets from both sides.
		let side_insets = View::get_left_inset() + View::get_right_inset();
		is_wide_screen && w >= (Self::SIDE_PANEL_WIDTH * 2.0) + side_insets
	}

	/// Toggle [`NetworkContent`] panel state.
	pub fn toggle_network_panel() {
		let is_open = NETWORK_PANEL_OPEN.load(Ordering::Relaxed);
		NETWORK_PANEL_OPEN.store(!is_open, Ordering::Relaxed);
	}

	/// Check if [`NetworkContent`] panel is open.
	pub fn is_network_panel_open() -> bool {
		NETWORK_PANEL_OPEN.load(Ordering::Relaxed)
	}

	/// Show exit confirmation [`Modal`].
	pub fn show_exit_modal() {
		Modal::new(Self::EXIT_CONFIRMATION_MODAL)
			.title(t!("confirmation"))
			.show();
	}

	/// Draw exit confirmation modal content.
	fn exit_modal_content(&mut self, ui: &mut egui::Ui, modal: &Modal, cb: &dyn PlatformCallbacks) {
		if self.show_exit_progress {
			if !Node::is_running() && !Node::data_dir_changing() {
				self.exit_allowed = true;
				cb.exit();
				Modal::close();
			}
			ui.add_space(16.0);
			ui.vertical_centered(|ui| {
				View::small_loading_spinner(ui);
				ui.add_space(12.0);
				let exit_status_text = if Node::data_dir_changing() {
					t!("moving_files")
				} else {
					t!("sync_status.shutdown")
				};
				ui.label(
					RichText::new(exit_status_text)
						.size(17.0)
						.color(Colors::text(false)),
				);
			});
			ui.add_space(10.0);
		} else {
			ui.add_space(8.0);
			ui.vertical_centered(|ui| {
				ui.label(
					RichText::new(t!("modal_exit.description"))
						.size(17.0)
						.color(Colors::text(false)),
				);
			});
			ui.add_space(10.0);

			// 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),
						|| {
							Modal::close();
						},
					);
				});
				columns[1].vertical_centered_justified(|ui| {
					View::button_ui(
						ui,
						t!("modal_exit.exit"),
						Colors::white_or_black(false),
						|_| {
							if !Node::is_running() && !Node::data_dir_changing() {
								self.exit_allowed = true;
								cb.exit();
								Modal::close();
							} else {
								Node::stop(true);
								modal.disable_closing();
								Modal::set_title(t!("modal_exit.exit"));
								self.show_exit_progress = true;
							}
						},
					);
				});
			});
			ui.add_space(6.0);
		}
	}

	/// Draw content for integrated node warning [`Modal`] on Android.
	fn android_warning_modal_ui(&mut self, ui: &mut egui::Ui) {
		ui.add_space(6.0);
		ui.vertical_centered(|ui| {
			ui.label(
				RichText::new(t!("network.android_warning"))
					.size(16.0)
					.color(Colors::text(false)),
			);
		});
		ui.add_space(8.0);
		ui.vertical_centered_justified(|ui| {
			View::button(ui, t!("continue"), Colors::white_or_black(false), || {
				AppConfig::show_android_integrated_node_warning();
				Modal::close();
			});
		});
		ui.add_space(6.0);
	}

	/// Draw content for integrated node warning [`Modal`] on Android.
	fn crash_report_modal_ui(&mut self, ui: &mut egui::Ui, cb: &dyn PlatformCallbacks) {
		ui.add_space(6.0);
		ui.vertical_centered(|ui| {
			ui.label(
				RichText::new(t!("crash_report_warning"))
					.size(16.0)
					.color(Colors::text(false)),
			);
			ui.add_space(6.0);
			// Draw button to share log file.
			let text = format!("{} {}", FILE_X, t!("share"));
			View::colored_text_button(
				ui,
				text,
				Colors::blue(),
				Colors::white_or_black(false),
				|| {
					if let Ok(data) = fs::read_to_string(Settings::log_path()) {
						let name = Settings::LOG_FILE_NAME.to_string();
						let _ = cb.share_data(name, data.as_bytes().to_vec());
					}
					Settings::delete_crash_check();
					Modal::close();
				},
			);
		});
		ui.add_space(8.0);
		View::horizontal_line(ui, Colors::item_stroke());
		ui.add_space(8.0);
		ui.vertical_centered_justified(|ui| {
			View::button(
				ui,
				t!("modal.cancel"),
				Colors::white_or_black(false),
				|| {
					Settings::delete_crash_check();
					Modal::close();
				},
			);
		});
		ui.add_space(6.0);
	}
}

/// Get [`NetworkContent`] panel state and width.
fn network_panel_state_width(ctx: &egui::Context, dual_panel: bool) -> (bool, f32) {
	let is_panel_open = dual_panel || Content::is_network_panel_open();
	let panel_width = if dual_panel {
		Content::SIDE_PANEL_WIDTH + View::get_left_inset()
	} else {
		let is_fullscreen = ctx.input(|i| i.viewport().fullscreen.unwrap_or(false));
		View::window_size(ctx).0
			- if View::is_desktop()
				&& !is_fullscreen
				&& OperatingSystem::from_target_os() != OperatingSystem::Mac
			{
				Content::WINDOW_FRAME_MARGIN * 2.0
			} else {
				0.0
			}
	};
	(is_panel_open, panel_width)
}