reasonkit-web 0.1.7

//! # Settings Synchronization Module
//!
//! User settings storage and cross-device synchronization.
//!
//! ## Features
//!
//! - Hierarchical settings storage (user > project > local)
//! - Real-time sync via WebSocket
//! - Conflict resolution with timestamps
//! - Offline queue for sync

#![allow(unused_variables)] // Stub implementation

use axum::{extract::Json, http::StatusCode, response::IntoResponse};
use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use serde_json::Value;
use std::collections::HashMap;
use uuid::Uuid;

/// User settings structure
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UserSettings {
    /// User ID
    pub user_id: Uuid,
    /// Settings version (for conflict resolution)
    pub version: u64,
    /// Last sync timestamp
    pub last_sync: DateTime<Utc>,
    /// ThinkTool preferences
    pub thinktool: ThinkToolSettings,
    /// CLI preferences
    pub cli: CliSettings,
    /// Editor/IDE preferences
    pub editor: EditorSettings,
    /// Notification preferences
    pub notifications: NotificationSettings,
    /// Custom key-value settings
    pub custom: HashMap<String, Value>,
}

#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct ThinkToolSettings {
    /// Default reasoning profile
    pub default_profile: String,
    /// Preferred LLM provider
    pub preferred_provider: Option<String>,
    /// Confidence threshold for auto-validation
    pub confidence_threshold: f64,
    /// Enable detailed trace output
    pub verbose_output: bool,
    /// Custom ThinkTool configurations
    pub custom_tools: HashMap<String, Value>,
}

#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct CliSettings {
    /// Output format (json, yaml, text)
    pub output_format: String,
    /// Enable color output
    pub color_enabled: bool,
    /// Pager command
    pub pager: Option<String>,
    /// History file path
    pub history_path: Option<String>,
    /// Maximum history entries
    pub max_history: usize,
}

#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct EditorSettings {
    /// Preferred editor command
    pub editor: String,
    /// Tab width
    pub tab_width: u8,
    /// Use spaces instead of tabs
    pub use_spaces: bool,
    /// Enable auto-save
    pub auto_save: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct NotificationSettings {
    /// Enable email notifications
    pub email_enabled: bool,
    /// Enable push notifications
    pub push_enabled: bool,
    /// Notification categories
    pub categories: HashMap<String, bool>,
}

impl Default for UserSettings {
    fn default() -> Self {
        Self {
            user_id: Uuid::nil(),
            version: 1,
            last_sync: Utc::now(),
            thinktool: ThinkToolSettings {
                default_profile: "balanced".to_string(),
                preferred_provider: None,
                confidence_threshold: 0.8,
                verbose_output: false,
                custom_tools: HashMap::new(),
            },
            cli: CliSettings {
                output_format: "text".to_string(),
                color_enabled: true,
                pager: Some("less".to_string()),
                history_path: None,
                max_history: 1000,
            },
            editor: EditorSettings {
                editor: std::env::var("EDITOR").unwrap_or_else(|_| "vim".to_string()),
                tab_width: 4,
                use_spaces: true,
                auto_save: false,
            },
            notifications: NotificationSettings::default(),
            custom: HashMap::new(),
        }
    }
}

/// Settings service for database operations
pub struct SettingsService {
    // TODO: Add database connection pool
}

impl SettingsService {
    pub fn new() -> Self {
        Self {}
    }

    /// Get settings for a user
    pub async fn get_settings(&self, user_id: Uuid) -> Result<UserSettings, SettingsError> {
        // TODO: Implement database query
        Ok(UserSettings {
            user_id,
            ..Default::default()
        })
    }

    /// Update settings with conflict resolution
    pub async fn update_settings(
        &self,
        user_id: Uuid,
        settings: UserSettings,
        client_version: u64,
    ) -> Result<UserSettings, SettingsError> {
        // TODO: Implement optimistic locking
        // 1. Check if client_version matches server version
        // 2. If match, update and increment version
        // 3. If mismatch, return conflict with server state
        Err(SettingsError::NotFound)
    }

    /// Get settings diff between two versions
    pub async fn get_diff(
        &self,
        user_id: Uuid,
        from_version: u64,
    ) -> Result<SettingsDiff, SettingsError> {
        // TODO: Implement diff calculation
        Err(SettingsError::NotFound)
    }
}

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

/// Settings diff for sync
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SettingsDiff {
    pub from_version: u64,
    pub to_version: u64,
    pub changes: Vec<SettingsChange>,
}

/// A single settings change record
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SettingsChange {
    /// JSON path to the changed setting (e.g., "thinktool.default_profile")
    pub path: String,
    /// Type of change operation
    pub operation: ChangeOperation,
    /// Previous value before the change (None for new keys)
    pub old_value: Option<Value>,
    /// New value after the change (None for deletions)
    pub new_value: Option<Value>,
    /// When the change occurred
    pub timestamp: DateTime<Utc>,
}

/// Type of settings change operation
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum ChangeOperation {
    /// Set a new value (create or replace)
    Set,
    /// Delete an existing value
    Delete,
    /// Merge with existing value (for objects/maps)
    Merge,
}

/// Settings operation errors
#[derive(Debug, thiserror::Error)]
pub enum SettingsError {
    /// Settings not found for the given user
    #[error("Settings not found")]
    NotFound,
    /// Optimistic locking conflict during update
    #[error("Version conflict: server has version {server}, client sent {client}")]
    VersionConflict {
        /// Current server version
        server: u64,
        /// Version sent by client
        client: u64,
    },
    /// Settings validation failed
    #[error("Invalid settings: {0}")]
    ValidationError(String),
    /// Database operation failed
    #[error("Database error: {0}")]
    DatabaseError(String),
}

/// HTTP handlers for settings endpoints
pub mod handlers {
    use super::*;

    /// Get current user's settings
    pub async fn get_settings() -> impl IntoResponse {
        let settings = UserSettings::default();
        (StatusCode::OK, Json(settings))
    }

    /// Update settings
    pub async fn update_settings(Json(settings): Json<UserSettings>) -> impl IntoResponse {
        // TODO: Implement with auth context and database
        (StatusCode::OK, Json(settings))
    }

    /// Trigger settings sync
    pub async fn sync_settings() -> impl IntoResponse {
        (
            StatusCode::OK,
            Json(serde_json::json!({
                "success": true,
                "synced_at": Utc::now(),
                "version": 1
            })),
        )
    }
}