App architecture modifications.

Now GUI and the app itself is divided into two different binaries.
The app also provides system tray icon.
Whereas the GUI can be used to configure the app.

app/src/config.rs

@@ -0,0 +1,144 @@
+pub mod structs;
+use structs::WakeWordEngine;
+use structs::SpeechToTextEngine;
+use structs::RecorderType;
+use structs::AudioType;
+
+use std::fs;
+use std::env;
+use std::path::PathBuf;
+use once_cell::sync::Lazy;
+
+use platform_dirs::{AppDirs};
+use rustpotter::{RustpotterConfig, WavFmt, DetectorConfig, FiltersConfig, ScoreMode, GainNormalizationConfig, BandPassConfig};
+
+use crate::{config, APP_DIRS, APP_CONFIG_DIR, APP_LOG_DIR};
+
+#[allow(dead_code)]
+
+pub fn init_dirs() -> Result<(), String> {
+    // infer app dirs
+    if APP_DIRS.get().is_some() {
+        return Ok(());
+    }
+
+    // cache_dir, config_dir, data_dir, state_dir
+    APP_DIRS.set(AppDirs::new(Some(config::BUNDLE_IDENTIFIER), false).unwrap()).unwrap();
+
+    // setup directories
+    let mut config_dir = PathBuf::from(&APP_DIRS.get().unwrap().config_dir);
+    let mut log_dir = PathBuf::from(&APP_DIRS.get().unwrap().config_dir);
+
+    // create dirs, if required
+    if !config_dir.exists() {
+        if fs::create_dir_all(&config_dir).is_err() {
+            config_dir = env::current_dir().expect("Cannot infer the config directory");
+            fs::create_dir_all(&config_dir).expect("Cannot create config directory, access denied?");
+        }
+    }
+
+    if !log_dir.exists() {
+        if fs::create_dir_all(&log_dir).is_err() {
+            log_dir = env::current_dir().expect("Cannot infer the log directory");
+            fs::create_dir_all(&log_dir).expect("Cannot create log directory, access denied?");
+        }
+    }
+
+    // store inferred paths
+    APP_CONFIG_DIR.set(config_dir).unwrap();
+    APP_LOG_DIR.set(log_dir).unwrap();
+
+    Ok(())
+}
+
+
+/*
+    Defaults.
+ */
+pub const DEFAULT_AUDIO_TYPE: AudioType = AudioType::Kira;
+pub const DEFAULT_RECORDER_TYPE: RecorderType = RecorderType::PvRecorder;
+pub const DEFAULT_WAKE_WORD_ENGINE: WakeWordEngine = WakeWordEngine::Rustpotter;
+pub const DEFAULT_SPEECH_TO_TEXT_ENGINE: SpeechToTextEngine = SpeechToTextEngine::Vosk;
+
+pub const DEFAULT_VOICE: &str = "jarvis-og";
+
+pub const BUNDLE_IDENTIFIER: &str = "com.priler.jarvis";
+pub const DB_FILE_NAME: &str = "app.db";
+pub const LOG_FILE_NAME: &str = "log.txt";
+pub const APP_VERSION: Option<&str> = option_env!("CARGO_PKG_VERSION");
+pub const AUTHOR_NAME: Option<&str> = option_env!("CARGO_PKG_AUTHORS");
+pub const REPOSITORY_LINK: Option<&str> = option_env!("CARGO_PKG_REPOSITORY");
+pub const TG_OFFICIAL_LINK: Option<&str> = Some("https://t.me/howdyho_official");
+pub const FEEDBACK_LINK: Option<&str> = Some("https://t.me/jarvis_feedback_bot");
+
+/*
+    Tray.
+ */
+pub const TRAY_ICON: &str = "32x32.png";
+pub const TRAY_TOOLTIP: &str = "Jarvis Voice Assistant";
+
+// RUSPOTTER
+pub const RUSPOTTER_MIN_SCORE: f32 = 0.62;
+pub const RUSTPOTTER_DEFAULT_CONFIG: Lazy<RustpotterConfig> = Lazy::new(|| {
+    RustpotterConfig {
+        fmt: WavFmt::default(),
+        detector: DetectorConfig {
+            avg_threshold: 0.,
+            threshold: 0.5,
+            min_scores: 15,
+            score_mode: ScoreMode::Average,
+            comparator_band_size: 5,
+            comparator_ref: 0.22
+        },
+        filters: FiltersConfig {
+            gain_normalizer: GainNormalizationConfig {
+                enabled: true,
+                gain_ref: None,
+                min_gain: 0.7,
+                max_gain: 1.0,
+            },
+            band_pass: BandPassConfig {
+                enabled: true,
+                low_cutoff: 80.,
+                high_cutoff: 400.,
+            }
+        }
+    }
+});
+
+// PICOVOICE
+pub const COMMANDS_PATH: &str = "commands/";
+pub const KEYWORDS_PATH: &str = "picovoice/keywords/";
+pub const DEFAULT_KEYWORD: &str = "jarvis_windows.ppn";
+pub const DEFAULT_SENSITIVITY: f32 = 1.0;
+
+// VOSK
+// pub const VOSK_MODEL_PATH: &str = const_concat!(PUBLIC_PATH, "/vosk/model_small");
+pub const VOSK_FETCH_PHRASE: &str = "джарвис";
+pub const VOSK_MODEL_PATH: &str = "vosk/model_small";
+pub const VOSK_MIN_RATIO: f64 = 70.0;
+
+// ETC
+pub const CMD_RATIO_THRESHOLD: f64 = 65f64;
+pub const CMS_WAIT_DELAY: std::time::Duration = std::time::Duration::from_secs(15);
+
+pub const ASSISTANT_GREET_PHRASES: [&str; 3] = ["greet1", "greet2", "greet3"];
+pub const ASSISTANT_PHRASES_TBR: [&str; 17] = [
+    "джарвис",
+    "сэр",
+    "слушаю сэр",
+    "всегда к услугам",
+    "произнеси",
+    "ответь",
+    "покажи",
+    "скажи",
+    "давай",
+    "да сэр",
+    "к вашим услугам сэр",
+    "всегда к вашим услугам сэр",
+    "запрос выполнен сэр",
+    "выполнен сэр",
+    "есть",
+    "загружаю сэр",
+    "очень тонкое замечание сэр",
+];