Mountain/Command/

TreeView.rs

//! # TreeView (Command)
//!
//! RESPONSIBILITIES:
//! - Defines Tauri command handlers for TreeView operations from Sky frontend
//! - Bridges TreeView UI requests to
//!   [`TreeViewProvider`](CommonLibrary::TreeView::TreeViewProvider)
//! - Handles tree data fetching, expansion, selection, and refresh operations
//! - Manages tree view state persistence and restoration (stubs)
//!
//! ARCHITECTURAL ROLE:
//! - Command module exposing TreeView functionality via Tauri IPC
//!   (`#[command]`)
//! - Delegates to Environment's `TreeViewProvider` via DI with `Require()`
//!   trait from `MountainEnvironment`
//! - Translates frontend requests to provider method calls with proper error
//!   mapping
//!
//! COMMAND REFERENCE (Tauri IPC):
//! - [`GetTreeViewChildren`]: Fetch child items for a tree node (by
//!   `ElementHandle`, null for root)
//! - [`GetTreeViewItem`]: Get tree item metadata (label, icon, description) by
//!   handle
//! - [`OnTreeViewExpansionChanged`]: Notify when user expands/collapses a node
//!   (stub - trait method missing)
//! - [`OnTreeViewSelectionChanged`]: Notify when user selects/deselects tree
//!   items (stub - trait method missing)
//! - [`RefreshTreeView`]: Request tree view to refresh its data, optionally
//!   specific items
//! - [`RevealTreeViewItem`]: Request to reveal/focus a specific tree item in
//!   the UI
//! - [`PersistTreeView`]: Save tree view state (scroll position, expansion)
//!   (stub)
//! - [`RestoreTreeView`]: Restore previously saved tree view state (stub)
//!
//! ERROR HANDLING:
//! - Returns `Result<Value, String>` with error strings sent to frontend
//! - Provider errors are logged with context and converted to error strings
//! - Missing trait methods return structured error indicating not implemented
//!
//! PERFORMANCE:
//! - All commands are async and non-blocking
//! - Tree data fetching should be efficient; provider may cache results
//! - Refresh can target specific items to avoid full tree rebuild
//!
//! VS CODE REFERENCE:
//! - `vs/workbench/api/browser/mainThreadTreeViews.ts` - main thread tree view
//!   API
//! - `vs/workbench/api/common/extHostTreeViews.ts` - extension host tree view
//!   API
//! - `vs/workbench/contrib/files/browser/explorerView.ts` - file explorer tree
//!   view
//! - `vs/workbench/contrib/tree/browser/treeView.ts` - generic tree view
//!   component
//!
//! TODO:
//! - Implement `OnTreeNodeExpanded` and `OnTreeSelectionChanged` in
//!   TreeViewProvider trait
//! - Add tree view state persistence to ApplicationState
//! - Implement drag and drop support for tree items
//! - Add tree item validation and disabled states
//! - Support tree item tooltips and description rendering
//! - Implement tree item icon theming (light/dark)
//! - Add tree view column support (multi-column tree views)
//! - Support tree view title and description updates
//! - Implement tree view badge (count overlay) functionality
//! - Add tree view message handling for dynamic updates
//! - Support tree item context menu contributions
//! - Implement tree item editing (inline rename)
//! - Add tree view accessibility (ARIA labels, keyboard navigation)
//!
//! MODULE CONTENTS:
//! - Tauri command functions (all `#[command] pub async fn`):
//!   - Data retrieval: `GetTreeViewChildren`, `GetTreeViewItem`
//!   - UI events: `OnTreeViewExpansionChanged`, `OnTreeViewSelectionChanged`
//!   - Management: `RefreshTreeView`, `RevealTreeViewItem`
//!   - State: `PersistTreeView`, `RestoreTreeView`

use std::sync::Arc;

use CommonLibrary::{
	Environment::Requires::Requires,
	TreeView::TreeViewProvider::TreeViewProvider as CommonTreeViewProvider,
};
use serde_json::{Value, json};
use tauri::{AppHandle, Manager, State, Wry, command};

use crate::{
	ApplicationState::ApplicationState,
	Environment::MountainEnvironment::MountainEnvironment,
	RunTime::ApplicationRunTime::ApplicationRunTime,
	dev_log,
};

/// A specific Tauri command handler for the UI to fetch the children of a tree
/// view node. This handler dispatches to the correct provider (native or
/// proxied).
#[command]
pub async fn GetTreeViewChildren(
	ApplicationHandle:AppHandle<Wry>,

	_State:State<'_, Arc<ApplicationState>>,

	ViewId:String,

	ElementHandle:Option<String>,
) -> Result<Value, String> {
	dev_log!("commands", "getting TreeView children for '{}', element: {:?}", ViewId, ElementHandle);

	let RunTime = ApplicationHandle.state::<Arc<ApplicationRunTime>>().inner().clone();

	let Environment:Arc<MountainEnvironment> = RunTime.Environment.clone();

	let TreeProvider:Arc<dyn CommonTreeViewProvider> = Environment.Require();

	match TreeProvider.GetChildren(ViewId.clone(), ElementHandle).await {
		Ok(Children) => Ok(json!(Children)),
		Err(Error) => {
			let ErrorMessage = format!("Failed to get children for tree view '{}': {}", ViewId, Error);
			dev_log!("commands", "error: {}", ErrorMessage);
			Err(ErrorMessage)
		},
	}
}

/// Gets the tree item for a given tree element handle.
#[command]
pub async fn GetTreeViewItem(
	ApplicationHandle:AppHandle<Wry>,

	_State:State<'_, Arc<ApplicationState>>,

	ViewId:String,

	ElementHandle:String,
) -> Result<Value, String> {
	dev_log!("commands", "getting TreeView item for '{}', element: {}", ViewId, ElementHandle);

	let RunTime = ApplicationHandle.state::<Arc<ApplicationRunTime>>().inner().clone();

	let Environment:Arc<MountainEnvironment> = RunTime.Environment.clone();

	let TreeProvider:Arc<dyn CommonTreeViewProvider> = Environment.Require();

	match TreeProvider.GetTreeItem(ViewId.clone(), ElementHandle).await {
		Ok(Item) => Ok(json!(Item)),
		Err(Error) => {
			let ErrorMessage = format!("Failed to get tree item for view '{}': {}", ViewId, Error);
			dev_log!("commands", "error: {}", ErrorMessage);
			Err(ErrorMessage)
		},
	}
}

/// Handles tree node expansion/collapse events.
///
/// TODO: Implement OnTreeNodeExpanded method in the TreeViewProvider trait.
/// This method notifies the provider when a node is expanded or collapsed,
/// allowing it to lazily load child items or preserve expansion state.
/// Currently returns an error indicating the method is not implemented.
#[command]
pub async fn OnTreeViewExpansionChanged(
	_ApplicationHandle:AppHandle<Wry>,

	_State:State<'_, Arc<ApplicationState>>,

	_ViewId:String,

	_ElementHandle:String,

	_IsExpanded:bool,
) -> Result<Value, String> {
	dev_log!("commands", "warn: OnTreeViewExpansionChanged not implemented");

	Ok(json!({ "success": false, "error": "OnTreeNodeExpanded method not implemented" }))
}

/// Handles tree selection changes.
///
/// TODO: Implement OnTreeSelectionChanged method in the TreeViewProvider trait.
/// This notifies the provider when the user selects or deselects tree items,
/// enabling context-specific actions or detail view updates. The provider
/// should respond to selection changes to update UI state or perform
/// operations.
#[command]
pub async fn OnTreeViewSelectionChanged(
	_ApplicationHandle:AppHandle<Wry>,

	_State:State<'_, Arc<ApplicationState>>,

	_ViewId:String,

	_SelectedHandles:Vec<String>,
) -> Result<Value, String> {
	dev_log!("commands", "warn: OnTreeViewSelectionChanged not implemented");

	Ok(json!({ "success": false, "error": "OnTreeSelectionChanged method not implemented" }))
}

/// Refreshes a tree view.
#[command]
pub async fn RefreshTreeView(
	ApplicationHandle:AppHandle<Wry>,

	_State:State<'_, Arc<ApplicationState>>,

	ViewId:String,

	ItemsToRefresh:Option<Vec<String>>,
) -> Result<Value, String> {
	dev_log!("commands", "refreshing tree view '{}', items: {:?}", ViewId, ItemsToRefresh);

	let RunTime = ApplicationHandle.state::<Arc<ApplicationRunTime>>().inner().clone();

	let Environment:Arc<MountainEnvironment> = RunTime.Environment.clone();

	let RefreshValue:Option<Value> = ItemsToRefresh.and_then(|items| serde_json::to_value(items).ok());

	match Environment.RefreshTreeView(ViewId.clone(), RefreshValue).await {
		Ok(_) => Ok(json!({ "success": true })),
		Err(Error) => {
			let ErrorMessage = format!("Failed to refresh tree view '{}': {}", ViewId, Error);
			dev_log!("commands", "error: {}", ErrorMessage);
			Err(ErrorMessage)
		},
	}
}

/// Reveals a specific tree item.
#[command]
pub async fn RevealTreeViewItem(
	ApplicationHandle:AppHandle<Wry>,

	_State:State<'_, Arc<ApplicationState>>,

	ViewId:String,

	ItemHandle:String,

	Options:Option<Value>,
) -> Result<Value, String> {
	dev_log!("commands", "revealing item '{}' in view '{}'", ItemHandle, ViewId);

	let RunTime = ApplicationHandle.state::<Arc<ApplicationRunTime>>().inner().clone();

	let Environment:Arc<MountainEnvironment> = RunTime.Environment.clone();

	let OptionsValue = Options.unwrap_or(json!({}));

	match Environment.RevealTreeItem(ViewId.clone(), ItemHandle, OptionsValue).await {
		Ok(_) => Ok(json!({ "success": true })),
		Err(Error) => {
			let ErrorMessage = format!("Failed to reveal tree item in view '{}': {}", ViewId, Error);
			dev_log!("commands", "error: {}", ErrorMessage);
			Err(ErrorMessage)
		},
	}
}

/// Persists tree view state.
///
/// TODO: Implement PersistTreeViewState method in the TreeViewProvider trait.
/// This method should serialize and store the current tree state (expansion,
/// selection, scroll position) to allow restoration across sessions. Typically
/// saved to workspace storage or ApplicationState for persistence.
#[command]
pub async fn PersistTreeView(
	_ApplicationHandle:AppHandle<Wry>,

	_State:State<'_, Arc<ApplicationState>>,

	_ViewId:String,
) -> Result<Value, String> {
	dev_log!("commands", "warn: PersistTreeView not implemented");

	Ok(json!({ "success": false, "error": "PersistTreeViewState method not implemented" }))
}

/// Restores tree view state.
///
/// TODO: Implement RestoreTreeViewState method in the TreeViewProvider trait.
/// This method should deserialize previously saved tree state and apply it
/// to the tree view (expanded nodes, selected items, scroll position). Called
/// when a tree view is recreated or the workspace is reloaded.
#[command]
pub async fn RestoreTreeView(
	_ApplicationHandle:AppHandle<Wry>,

	_State:State<'_, Arc<ApplicationState>>,

	_ViewId:String,

	_StateValue:Value,
) -> Result<Value, String> {
	dev_log!("commands", "warn: RestoreTreeView not implemented");

	Ok(json!({ "success": false, "error": "RestoreTreeViewState method not implemented" }))
}