Add storage module for presets, config, session, and history persistence

Preset save/load/list/delete/import/export, config JSON persistence,
session state save/restore, and processing history log with append/clear.
All stored as JSON under ~/.config/pixstrip/.

pixstrip-core/src/lib.rs

@@ -7,6 +7,7 @@ pub mod loader;
 pub mod operations;
 pub mod pipeline;
 pub mod preset;
+pub mod storage;
 pub mod types;
 
 pub fn version() -> &'static str {

pixstrip-core/src/storage.rs

@@ -0,0 +1,287 @@
+use std::path::{Path, PathBuf};
+
+use serde::{Deserialize, Serialize};
+
+use crate::config::AppConfig;
+use crate::error::{PixstripError, Result};
+use crate::preset::Preset;
+
+fn default_config_dir() -> PathBuf {
+    dirs::config_dir()
+        .unwrap_or_else(|| PathBuf::from("~/.config"))
+        .join("pixstrip")
+}
+
+fn sanitize_filename(name: &str) -> String {
+    name.chars()
+        .map(|c| match c {
+            '/' | '\\' | '<' | '>' | ':' | '"' | '|' | '?' | '*' => '_',
+            _ => c,
+        })
+        .collect()
+}
+
+// --- Preset Store ---
+
+pub struct PresetStore {
+    presets_dir: PathBuf,
+}
+
+impl PresetStore {
+    pub fn new() -> Self {
+        Self {
+            presets_dir: default_config_dir().join("presets"),
+        }
+    }
+
+    pub fn with_base_dir(base: &Path) -> Self {
+        Self {
+            presets_dir: base.join("presets"),
+        }
+    }
+
+    fn ensure_dir(&self) -> Result<()> {
+        std::fs::create_dir_all(&self.presets_dir).map_err(PixstripError::Io)
+    }
+
+    fn preset_path(&self, name: &str) -> PathBuf {
+        let filename = format!("{}.json", sanitize_filename(name));
+        self.presets_dir.join(filename)
+    }
+
+    pub fn save(&self, preset: &Preset) -> Result<()> {
+        self.ensure_dir()?;
+        let path = self.preset_path(&preset.name);
+        let json = serde_json::to_string_pretty(preset)
+            .map_err(|e| PixstripError::Preset(e.to_string()))?;
+        std::fs::write(&path, json).map_err(PixstripError::Io)
+    }
+
+    pub fn load(&self, name: &str) -> Result<Preset> {
+        let path = self.preset_path(name);
+        if !path.exists() {
+            return Err(PixstripError::Preset(format!(
+                "Preset '{}' not found",
+                name
+            )));
+        }
+        let data = std::fs::read_to_string(&path).map_err(PixstripError::Io)?;
+        serde_json::from_str(&data).map_err(|e| PixstripError::Preset(e.to_string()))
+    }
+
+    pub fn list(&self) -> Result<Vec<Preset>> {
+        if !self.presets_dir.exists() {
+            return Ok(Vec::new());
+        }
+
+        let mut presets = Vec::new();
+        for entry in std::fs::read_dir(&self.presets_dir).map_err(PixstripError::Io)? {
+            let entry = entry.map_err(PixstripError::Io)?;
+            let path = entry.path();
+            if path.extension().and_then(|e| e.to_str()) == Some("json") {
+                let data = std::fs::read_to_string(&path).map_err(PixstripError::Io)?;
+                if let Ok(preset) = serde_json::from_str::<Preset>(&data) {
+                    presets.push(preset);
+                }
+            }
+        }
+        presets.sort_by(|a, b| a.name.cmp(&b.name));
+        Ok(presets)
+    }
+
+    pub fn delete(&self, name: &str) -> Result<()> {
+        let path = self.preset_path(name);
+        if !path.exists() {
+            return Err(PixstripError::Preset(format!(
+                "Preset '{}' not found",
+                name
+            )));
+        }
+        std::fs::remove_file(&path).map_err(PixstripError::Io)
+    }
+
+    pub fn export_to_file(&self, preset: &Preset, path: &Path) -> Result<()> {
+        let json = serde_json::to_string_pretty(preset)
+            .map_err(|e| PixstripError::Preset(e.to_string()))?;
+        std::fs::write(path, json).map_err(PixstripError::Io)
+    }
+
+    pub fn import_from_file(&self, path: &Path) -> Result<Preset> {
+        let data = std::fs::read_to_string(path).map_err(PixstripError::Io)?;
+        let mut preset: Preset =
+            serde_json::from_str(&data).map_err(|e| PixstripError::Preset(e.to_string()))?;
+        preset.is_custom = true;
+        Ok(preset)
+    }
+}
+
+impl Default for PresetStore {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+// --- Config Store ---
+
+pub struct ConfigStore {
+    config_path: PathBuf,
+}
+
+impl ConfigStore {
+    pub fn new() -> Self {
+        Self {
+            config_path: default_config_dir().join("config.json"),
+        }
+    }
+
+    pub fn with_base_dir(base: &Path) -> Self {
+        Self {
+            config_path: base.join("config.json"),
+        }
+    }
+
+    pub fn save(&self, config: &AppConfig) -> Result<()> {
+        if let Some(parent) = self.config_path.parent() {
+            std::fs::create_dir_all(parent).map_err(PixstripError::Io)?;
+        }
+        let json = serde_json::to_string_pretty(config)
+            .map_err(|e| PixstripError::Config(e.to_string()))?;
+        std::fs::write(&self.config_path, json).map_err(PixstripError::Io)
+    }
+
+    pub fn load(&self) -> Result<AppConfig> {
+        if !self.config_path.exists() {
+            return Ok(AppConfig::default());
+        }
+        let data = std::fs::read_to_string(&self.config_path).map_err(PixstripError::Io)?;
+        serde_json::from_str(&data).map_err(|e| PixstripError::Config(e.to_string()))
+    }
+}
+
+impl Default for ConfigStore {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+// --- Session Store ---
+
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+pub struct SessionState {
+    pub last_input_dir: Option<String>,
+    pub last_output_dir: Option<String>,
+    pub last_preset_name: Option<String>,
+    pub current_step: u32,
+}
+
+pub struct SessionStore {
+    session_path: PathBuf,
+}
+
+impl SessionStore {
+    pub fn new() -> Self {
+        Self {
+            session_path: default_config_dir().join("session.json"),
+        }
+    }
+
+    pub fn with_base_dir(base: &Path) -> Self {
+        Self {
+            session_path: base.join("session.json"),
+        }
+    }
+
+    pub fn save(&self, state: &SessionState) -> Result<()> {
+        if let Some(parent) = self.session_path.parent() {
+            std::fs::create_dir_all(parent).map_err(PixstripError::Io)?;
+        }
+        let json = serde_json::to_string_pretty(state)
+            .map_err(|e| PixstripError::Config(e.to_string()))?;
+        std::fs::write(&self.session_path, json).map_err(PixstripError::Io)
+    }
+
+    pub fn load(&self) -> Result<SessionState> {
+        if !self.session_path.exists() {
+            return Ok(SessionState::default());
+        }
+        let data = std::fs::read_to_string(&self.session_path).map_err(PixstripError::Io)?;
+        serde_json::from_str(&data).map_err(|e| PixstripError::Config(e.to_string()))
+    }
+}
+
+impl Default for SessionStore {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+// --- History Store ---
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct HistoryEntry {
+    pub timestamp: String,
+    pub input_dir: String,
+    pub output_dir: String,
+    pub preset_name: Option<String>,
+    pub total: usize,
+    pub succeeded: usize,
+    pub failed: usize,
+    pub total_input_bytes: u64,
+    pub total_output_bytes: u64,
+    pub elapsed_ms: u64,
+    pub output_files: Vec<String>,
+}
+
+pub struct HistoryStore {
+    history_path: PathBuf,
+}
+
+impl HistoryStore {
+    pub fn new() -> Self {
+        Self {
+            history_path: default_config_dir().join("history.json"),
+        }
+    }
+
+    pub fn with_base_dir(base: &Path) -> Self {
+        Self {
+            history_path: base.join("history.json"),
+        }
+    }
+
+    pub fn add(&self, entry: HistoryEntry) -> Result<()> {
+        let mut entries = self.list()?;
+        entries.push(entry);
+        self.write_all(&entries)
+    }
+
+    pub fn list(&self) -> Result<Vec<HistoryEntry>> {
+        if !self.history_path.exists() {
+            return Ok(Vec::new());
+        }
+        let data = std::fs::read_to_string(&self.history_path).map_err(PixstripError::Io)?;
+        if data.trim().is_empty() {
+            return Ok(Vec::new());
+        }
+        serde_json::from_str(&data).map_err(|e| PixstripError::Config(e.to_string()))
+    }
+
+    pub fn clear(&self) -> Result<()> {
+        self.write_all(&Vec::<HistoryEntry>::new())
+    }
+
+    fn write_all(&self, entries: &[HistoryEntry]) -> Result<()> {
+        if let Some(parent) = self.history_path.parent() {
+            std::fs::create_dir_all(parent).map_err(PixstripError::Io)?;
+        }
+        let json = serde_json::to_string_pretty(entries)
+            .map_err(|e| PixstripError::Config(e.to_string()))?;
+        std::fs::write(&self.history_path, json).map_err(PixstripError::Io)
+    }
+}
+
+impl Default for HistoryStore {
+    fn default() -> Self {
+        Self::new()
+    }
+}