//! ## AuthActivity
//!
//! `auth_activity` is the module which implements the authentication activity

/*
*
*   Copyright (C) 2020-2021 Christian Visintin - christian.visintin1997@gmail.com
*
* 	This file is part of "TermSCP"
*
*   TermSCP is free software: you can redistribute it and/or modify
*   it under the terms of the GNU General Public License as published by
*   the Free Software Foundation, either version 3 of the License, or
*   (at your option) any later version.
*
*   TermSCP is distributed in the hope that it will be useful,
*   but WITHOUT ANY WARRANTY; without even the implied warranty of
*   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*   GNU General Public License for more details.
*
*   You should have received a copy of the GNU General Public License
*   along with TermSCP.  If not, see <http://www.gnu.org/licenses/>.
*
*/

// Sub modules
mod bookmarks;
mod update;
mod view;

// Dependencies
extern crate crossterm;
extern crate tui;

// locals
use super::{Activity, Context};
use crate::filetransfer::FileTransferProtocol;
use crate::system::bookmarks_client::BookmarksClient;
use crate::ui::context::FileTransferParams;
use crate::ui::layout::view::View;
use crate::utils::git;

// Includes
use crossterm::terminal::{disable_raw_mode, enable_raw_mode};

// -- components
const COMPONENT_TEXT_HEADER: &str = "TEXT_HEADER";
const COMPONENT_TEXT_NEW_VERSION: &str = "TEXT_NEW_VERSION";
const COMPONENT_TEXT_FOOTER: &str = "TEXT_FOOTER";
const COMPONENT_TEXT_HELP: &str = "TEXT_HELP";
const COMPONENT_TEXT_ERROR: &str = "TEXT_ERROR";
const COMPONENT_INPUT_ADDR: &str = "INPUT_ADDRESS";
const COMPONENT_INPUT_PORT: &str = "INPUT_PORT";
const COMPONENT_INPUT_USERNAME: &str = "INPUT_USERNAME";
const COMPONENT_INPUT_PASSWORD: &str = "INPUT_PASSWORD";
const COMPONENT_INPUT_BOOKMARK_NAME: &str = "INPUT_BOOKMARK_NAME";
const COMPONENT_RADIO_PROTOCOL: &str = "RADIO_PROTOCOL";
const COMPONENT_RADIO_QUIT: &str = "RADIO_QUIT";
const COMPONENT_RADIO_BOOKMARK_DEL_BOOKMARK: &str = "RADIO_DELETE_BOOKMARK";
const COMPONENT_RADIO_BOOKMARK_DEL_RECENT: &str = "RADIO_DELETE_RECENT";
const COMPONENT_RADIO_BOOKMARK_SAVE_PWD: &str = "RADIO_SAVE_PASSWORD";
const COMPONENT_BOOKMARKS_LIST: &str = "BOOKMARKS_LIST";
const COMPONENT_RECENTS_LIST: &str = "RECENTS_LIST";

// Store keys
const STORE_KEY_LATEST_VERSION: &str = "AUTH_LATEST_VERSION";

/// ### AuthActivity
///
/// AuthActivity is the data holder for the authentication activity
pub struct AuthActivity {
    pub submit: bool, // becomes true after user has submitted fields
    pub quit: bool,   // Becomes true if user has pressed esc
    pub setup: bool,  // Becomes true if user has requested setup
    context: Option<Context>,
    view: View,
    bookmarks_client: Option<BookmarksClient>,
    redraw: bool,                // Should ui actually be redrawned?
    bookmarks_list: Vec<String>, // List of bookmarks
    recents_list: Vec<String>,   // list of recents
}

impl Default for AuthActivity {
    fn default() -> Self {
        Self::new()
    }
}

impl AuthActivity {
    /// ### new
    ///
    /// Instantiates a new AuthActivity
    pub fn new() -> AuthActivity {
        AuthActivity {
            submit: false,
            quit: false,
            setup: false,
            context: None,
            view: View::init(),
            bookmarks_client: None,
            redraw: true, // True at startup
            bookmarks_list: Vec::new(),
            recents_list: Vec::new(),
        }
    }

    /// ### on_create
    ///
    /// If enabled in configuration, check for updates from Github
    fn check_for_updates(&mut self) {
        // Check version only if unset in the store
        let ctx: &Context = self.context.as_ref().unwrap();
        if !ctx.store.isset(STORE_KEY_LATEST_VERSION) {
            let mut new_version: Option<String> = match ctx.config_client.as_ref() {
                Some(client) => {
                    if client.get_check_for_updates() {
                        // Send request
                        match git::check_for_updates(env!("CARGO_PKG_VERSION")) {
                            Ok(version) => version,
                            Err(err) => {
                                // Report error
                                self.mount_error(
                                    format!("Could not check for new updates: {}", err).as_str(),
                                );
                                // None
                                None
                            }
                        }
                    } else {
                        None
                    }
                }
                None => None,
            };
            let ctx: &mut Context = self.context.as_mut().unwrap();
            // Set version into the store (or just a flag)
            match new_version.take() {
                Some(new_version) => ctx.store.set_string(STORE_KEY_LATEST_VERSION, new_version), // If Some, set String
                None => ctx.store.set(STORE_KEY_LATEST_VERSION), // If None, just set flag
            }
        }
    }
}

impl Activity for AuthActivity {
    /// ### on_create
    ///
    /// `on_create` is the function which must be called to initialize the activity.
    /// `on_create` must initialize all the data structures used by the activity
    /// Context is taken from activity manager and will be released only when activity is destroyed
    fn on_create(&mut self, mut context: Context) {
        // Initialize file transfer params
        context.ft_params = Some(FileTransferParams::default());
        // Set context
        self.context = Some(context);
        // Clear terminal
        self.context.as_mut().unwrap().clear_screen();
        // Put raw mode on enabled
        let _ = enable_raw_mode();
        // Init bookmarks client
        if self.bookmarks_client.is_none() {
            self.init_bookmarks_client();
        }
        // Verify error state from context
        if let Some(err) = self.context.as_mut().unwrap().get_error() {
            self.mount_error(err.as_str());
        }
        // If check for updates is enabled, check for updates
        self.check_for_updates();
        // Initialize view
        self.init();
    }

    /// ### on_draw
    ///
    /// `on_draw` is the function which draws the graphical interface.
    /// This function must be called at each tick to refresh the interface
    fn on_draw(&mut self) {
        // Context must be something
        if self.context.is_none() {
            return;
        }
        // Read one event
        if let Ok(Some(event)) = self.context.as_ref().unwrap().input_hnd.read_event() {
            // Set redraw to true
            self.redraw = true;
            // Handle event on view and update
            let msg = self.view.on(event);
            self.update(msg);
        }
        // Redraw if necessary
        if self.redraw {
            // View
            self.view();
            // Set redraw to false
            self.redraw = false;
        }
    }

    /// ### on_destroy
    ///
    /// `on_destroy` is the function which cleans up runtime variables and data before terminating the activity.
    /// This function must be called once before terminating the activity.
    /// This function finally releases the context
    fn on_destroy(&mut self) -> Option<Context> {
        // Disable raw mode
        let _ = disable_raw_mode();
        self.context.as_ref()?;
        // Clear terminal and return
        match self.context.take() {
            Some(mut ctx) => {
                ctx.clear_screen();
                Some(ctx)
            }
            None => None,
        }
    }
}