Add preferences

1 files changed, 99 insertions, 0 deletions

diff --git a/src/preferences/storage.rs b/src/preferences/storage.rs
new file mode 100644
index 0000000..889b503
--- /dev/null
+++ b/src/preferences/storage.rs
@@ -0,0 +1,99 @@
+// Copyright (C) 2024 Rubén Beltrán del Río
+
+// This program 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.
+
+// This program 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 this program. If not, see https://map.tranquil.systems.
+
+use std::fs;
+use std::path::PathBuf;
+
+use crate::constants;
+
+use super::models::{UserPreferences, UserPreferencesJson};
+
+/// Returns the XDG config directory path for preferences
+pub fn config_dir() -> PathBuf {
+    dirs::config_dir()
+        .unwrap_or_else(|| PathBuf::from("."))
+        .join(constants::APP_ID)
+}
+
+/// Returns the preferences file path
+pub fn preferences_path() -> PathBuf {
+    config_dir().join("preferences.json")
+}
+
+/// Loads preferences from disk, returning defaults if not found
+pub fn load() -> UserPreferences {
+    let path = preferences_path();
+
+    if path.exists() {
+        match fs::read_to_string(&path) {
+            Ok(content) => serde_json::from_str(&content).unwrap_or_default(),
+            Err(_) => UserPreferences::default(),
+        }
+    } else {
+        UserPreferences::default()
+    }
+}
+
+/// Saves preferences to disk
+pub fn save(prefs: &UserPreferences) -> Result<(), std::io::Error> {
+    let path = preferences_path();
+
+    // Ensure config directory exists
+    if let Some(parent) = path.parent() {
+        fs::create_dir_all(parent)?;
+    }
+
+    let content = serde_json::to_string_pretty(prefs).map_err(std::io::Error::other)?;
+
+    fs::write(path, content)
+}
+
+/// Exports preferences to JSON string (for file export)
+pub fn export_json(prefs: &UserPreferences) -> Option<String> {
+    let json_prefs = prefs.to_json();
+    serde_json::to_string_pretty(&json_prefs).ok()
+}
+
+/// Imports preferences from JSON string (partial updates supported)
+/// Returns true on success, false on parse error
+pub fn import_json(prefs: &mut UserPreferences, json: &str) -> bool {
+    match serde_json::from_str::<UserPreferencesJson>(json) {
+        Ok(imported) => {
+            prefs.update_from_json(&imported);
+            true
+        }
+        Err(_) => false,
+    }
+}
+
+/// Saves preferences to a specific file path (for export dialog)
+pub fn export_to_file(prefs: &UserPreferences, path: &PathBuf) -> Result<(), std::io::Error> {
+    let content =
+        export_json(prefs).ok_or_else(|| std::io::Error::other("Serialization failed"))?;
+    fs::write(path, content)
+}
+
+/// Loads preferences from a specific file path (for import dialog)
+pub fn import_from_file(prefs: &mut UserPreferences, path: &PathBuf) -> Result<(), std::io::Error> {
+    let content = fs::read_to_string(path)?;
+    if import_json(prefs, &content) {
+        Ok(())
+    } else {
+        Err(std::io::Error::new(
+            std::io::ErrorKind::InvalidData,
+            "Invalid preferences format",
+        ))
+    }
+}