//
//  MainController.swift
//  AutoCat2Mac
//
//  Created by Selim Mustafaev on 15.06.2022.
//

import AppKit

class SidebarController: NSViewController, NSOutlineViewDataSource, NSOutlineViewDelegate {
    
    @IBOutlet weak var outlineView: NSOutlineView!
    
    var sections: [SidebarSection] = [
        .database(items: [
            SidebarFilterItem.local,
            SidebarFilterItem.remote
        ])
    ]
    
    var addItem: NSToolbarItem?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        outlineView.usesAutomaticRowHeights = true
    }
    
    // MARK: - NSOutlineViewDataSource
    
    func outlineView(_ outlineView: NSOutlineView, numberOfChildrenOfItem item: Any?) -> Int {
        guard item != nil else {
            return sections.count
        }
        
        if let section = item as? SidebarSection {
            return section.items.count
        } else {
            return 0
        }
    }
    
    func outlineView(_ outlineView: NSOutlineView, child index: Int, ofItem item: Any?) -> Any {
        guard item != nil else {
            return sections[index]
        }
        
        if let section = item as? SidebarSection {
            return section.items[index]
        } else {
            return sections[index]
        }
    }
    
    func outlineView(_ outlineView: NSOutlineView, isItemExpandable item: Any) -> Bool {
        return item is SidebarSection
    }
    
    // MARK: - NSOutlineViewDelegate
    
    func outlineView(_ outlineView: NSOutlineView, viewFor tableColumn: NSTableColumn?, item: Any) -> NSView? {
        
        if let category = item as? SidebarSection {
            let cell = outlineView.makeView(withIdentifier: NSUserInterfaceItemIdentifier(rawValue: "SidebarHeaderCell"), owner: nil) as? NSTableCellView
            cell?.textField?.stringValue = category.name
            return cell
        } else if let item = item as? SidebarItem {
            let cell = outlineView.makeView(withIdentifier: NSUserInterfaceItemIdentifier(rawValue: "SidebarItemCell"), owner: nil) as? NSTableCellView
            cell?.textField?.stringValue = item.title
            cell?.imageView?.image = NSImage(systemSymbolName: item.iconName, accessibilityDescription: item.title)
            return cell
        }
        
        return nil
    }
    
    func outlineView(_ outlineView: NSOutlineView, isGroupItem item: Any) -> Bool {
        item is SidebarSection
    }
    
    func outlineView(_ outlineView: NSOutlineView, shouldSelectItem item: Any) -> Bool {
        outlineView.parent(forItem: item) != nil
    }
    
    func outlineView(_ outlineView: NSOutlineView, persistentObjectForItem item: Any?) -> Any? {
        guard let section = item as? SidebarSection else {
            return nil
        }
        
        return section.name
    }
    
    func outlineView(_ outlineView: NSOutlineView, itemForPersistentObject object: Any) -> Any? {
        guard let name = object as? String else {
            return nil
        }
        
        return sections.first { $0.name == name }
    }
    
    func outlineViewSelectionDidChange(_ notification: Notification) {
        let item = self.outlineView.item(atRow: self.outlineView.selectedRow)

        if let filter = item as? SidebarFilterItem {
            print("Selected filter: ", filter.title)
        }
    }
}