//
//  KMHomeQuickToolsCollectionView.swift
//  PDF Reader Pro
//
//  Created by lizhe on 2023/10/31.
//

import Cocoa

typealias KMHomeQuickToolsCollectionViewDataDidChange = (_ view: KMHomeQuickToolsCollectionView, _ showData: [NSNumber]) ->Void

class KMHomeQuickToolsCollectionView: BaseXibView {
    @IBOutlet weak var showBox: NSBox!
    @IBOutlet weak var showLabel: NSTextField!
    @IBOutlet weak var removeBox: NSBox!
    @IBOutlet weak var removeButton: NSButton!
    @IBOutlet weak var removeButtonLayoutConstraint: NSLayoutConstraint!
    @IBOutlet weak var showCollectionView: NSCollectionView!
    @IBOutlet weak var showScrollView: NSScrollView!
    
    @IBOutlet weak var hideBox: NSBox!
    @IBOutlet weak var hideLabel: NSTextField!
    @IBOutlet weak var addBox: NSBox!
    @IBOutlet weak var addButton: NSButton!
    @IBOutlet weak var addButtonLayoutConstraint: NSLayoutConstraint!
    @IBOutlet weak var hideCollectionView: NSCollectionView!
    @IBOutlet weak var hideScrollView: NSScrollView!
    
    @IBOutlet weak var promptLabel: NSTextField!
    @IBOutlet weak var showCollectionBox: NSBox!
    @IBOutlet weak var hideCollectionBox: NSBox!
    
    var dataChange: KMHomeQuickToolsCollectionViewDataDidChange?
    
    var indexPathsOfItemsBeingShowItemDragged: Set<IndexPath> = []
    var indexPathsOfItemsBeingHideItemDragged: Set<IndexPath> = []
    
    var showArray: [NSNumber] = []
    var hideArray: [NSNumber] = []
    var selectShowItemMutableArray: [IndexPath] = []
    var selectHideItemMutableArray: [IndexPath] = []
    var collectionItemWidth: CGFloat = 0
    let collectionItemHeight: CGFloat = 32
    
    func setup() {
        showLabel.stringValue = NSLocalizedString("Show", comment: "")
        hideLabel.stringValue = NSLocalizedString("Hide", comment: "")
        removeButton.title = NSLocalizedString("Remove", comment: "")
        addButton.title = NSLocalizedString("Add", comment: "")
        promptLabel.stringValue = NSLocalizedString("Drag and drop to add, remove and reorder the tools.", comment: "")
        promptLabel.textColor = KMAppearance.Layout.h1Color()

        showScrollView.drawsBackground = false
        hideScrollView.drawsBackground = false

        removeBox.borderColor = NSColor.gridColor
        addBox.borderColor = NSColor.gridColor
        removeBox.fillColor = NSColor.gridColor
        addBox.fillColor = NSColor.gridColor
        removeButton.isEnabled = false
        addButton.isEnabled = false

        let removeButtonConstant = labelReturnedValue(withString: NSLocalizedString("Remove", comment: ""), height: 20, fontSize: 11.0)
        let addButtonConstant = labelReturnedValue(withString:NSLocalizedString("Add", comment: ""), height: 20.0, fontSize: 11.0)
        var constant: CGFloat = 0
        if removeButtonConstant > addButtonConstant {
            constant = removeButtonConstant + 30
        } else {
            constant = addButtonConstant + 30
        }
        removeButtonLayoutConstraint.constant = constant
        addButtonLayoutConstraint.constant = constant

        showCollectionView.enclosingScrollView?.scrollerStyle = .legacy
        hideCollectionView.enclosingScrollView?.scrollerStyle = .legacy

        let shadow = NSShadow()
        shadow.shadowColor = KMAppearance.Status.hovColor()
        shadow.shadowOffset = NSMakeSize(0, 1)
        showCollectionBox.wantsLayer = true
        showCollectionBox.shadow = shadow
        hideCollectionBox.wantsLayer = true
        hideCollectionBox.shadow = shadow

        showCollectionView.register(KMHomeQuickToolsWindowCollectionViewItem.self, forItemWithIdentifier: NSUserInterfaceItemIdentifier("KMHomeQuickToolsWindowCollectionViewItem"))
        hideCollectionView.register(KMHomeQuickToolsWindowCollectionViewItem.self, forItemWithIdentifier: NSUserInterfaceItemIdentifier("KMHomeQuickToolsWindowCollectionViewItem"))

        showCollectionView.delegate = self
        showCollectionView.dataSource = self
        hideCollectionView.delegate = self
        hideCollectionView.dataSource = self

        showCollectionView.layer?.cornerRadius = 3.0
        hideCollectionView.layer?.cornerRadius = 3.0

        registerForCollectionViewDragAndDrop()
        
//        self.showCollectionView.reloadData()
//        self.hideCollectionView.reloadData()
    }
    
    func showData(showArr: [NSNumber], hideArr: [NSNumber]) {
        collectionItemWidth = self.itemReturnedWidthValue(withShowArray: showArr, hideArray: hideArr, fontSize: 12, height: collectionItemHeight) + 40
        showArray = showArr
        hideArray = hideArr
    }

    func registerForCollectionViewDragAndDrop() {
        showCollectionView.registerForDraggedTypes([NSPasteboard.PasteboardType.string])
        showCollectionView.setDraggingSourceOperationMask(.every, forLocal: false)
        showCollectionView.setDraggingSourceOperationMask(.every, forLocal: true)

        hideCollectionView.registerForDraggedTypes([NSPasteboard.PasteboardType.string])
        hideCollectionView.setDraggingSourceOperationMask(.every, forLocal: false)
        hideCollectionView.setDraggingSourceOperationMask(.every, forLocal: true)
    }

    func moveCell(fromIndex: Int, toIndex: Int, collectionView: NSCollectionView) {
        if collectionView == showCollectionView {
            let fromNumber = showArray[fromIndex]
            var currentIndex = fromIndex
            if fromIndex <= toIndex {
                for _ in fromIndex..<toIndex {
                    currentIndex = showArray.firstIndex(of: fromNumber) ?? fromIndex
                    if currentIndex < toIndex {
                        showArray.swapAt(currentIndex, currentIndex + 1)
                        currentIndex += 1
                    }
                }
            } else {
                for _ in toIndex..<fromIndex {
                    currentIndex = showArray.firstIndex(of: fromNumber) ?? fromIndex
                    if currentIndex > toIndex {
                        showArray.swapAt(currentIndex, currentIndex - 1)
                        currentIndex -= 1
                    }
                }
            }
        } else if collectionView == hideCollectionView {
            let fromNumber = hideArray[fromIndex]
            var currentIndex = fromIndex
            if fromIndex <= toIndex {
                for _ in fromIndex..<toIndex {
                    currentIndex = hideArray.firstIndex(of: fromNumber) ?? fromIndex
                    if currentIndex < toIndex {
                        hideArray.swapAt(currentIndex, currentIndex + 1)
                        currentIndex += 1
                    }
                }
            } else {
                for _ in toIndex..<fromIndex {
                    currentIndex = hideArray.firstIndex(of: fromNumber) ?? fromIndex
                    if currentIndex > toIndex {
                        hideArray.swapAt(currentIndex, currentIndex - 1)
                        currentIndex -= 1
                    }
                }
            }
        }
    }

    func labelReturnedValue(withString value: String, height: CGFloat, fontSize: CGFloat) -> CGFloat {
        if let value = value as NSString? {
            let rect = value.boundingRect(with: CGSize(width: .greatestFiniteMagnitude, height: height), options: .usesLineFragmentOrigin, attributes: [NSAttributedString.Key.font: NSFont.systemFont(ofSize: fontSize)], context: nil)
            return rect.size.width
        }
        return 0
    }
}

extension KMHomeQuickToolsCollectionView {
    @IBAction func removeButtonAction(_ sender: Any) {
        for indexPath in selectShowItemMutableArray {
            let itemCount = indexPath.item
            hideArray.append(showArray[itemCount])
            showArray.remove(at: itemCount)
        }

        removeBox.borderColor = NSColor.gridColor
        removeButton.isEnabled = false
        addBox.borderColor = NSColor.gridColor
        addButton.isEnabled = false
        hideCollectionView.reloadData()
        showCollectionView.reloadData()
        
        guard let callBack = dataChange else { return }
        callBack(self, showArray)
    }
    
    @IBAction func addButtonAction(_ sender: Any) {
        for indexPath in selectHideItemMutableArray {
            let itemCount = indexPath.item
            showArray.append(hideArray[itemCount])
            hideArray.remove(at: itemCount)
        }

        removeBox.borderColor = NSColor.gridColor
        addButton.isEnabled = false
        addBox.borderColor = NSColor.gridColor
        removeButton.isEnabled = false
        showCollectionView.reloadData()
        hideCollectionView.reloadData()
        
        guard let callBack = dataChange else { return }
        callBack(self, showArray)

    }
}

extension KMHomeQuickToolsCollectionView: NSCollectionViewDelegate, NSCollectionViewDataSource, NSCollectionViewDelegateFlowLayout {
    func collectionView(_ collectionView: NSCollectionView, itemForRepresentedObjectAt indexPath: IndexPath) -> NSCollectionViewItem {
        let item = collectionView.makeItem(withIdentifier: NSUserInterfaceItemIdentifier(rawValue: "KMHomeQuickToolsWindowCollectionViewItem"), for: indexPath) as! KMHomeQuickToolsWindowCollectionViewItem
        
        if collectionView.isEqual(showCollectionView) {
            item.model = KMQucikToolsModel(type: DataNavigationViewButtonActionType(rawValue: Int(truncating: showArray[indexPath.item])))
        } else if collectionView.isEqual(hideCollectionView) {
            item.model = KMQucikToolsModel(type: DataNavigationViewButtonActionType(rawValue: Int(truncating: hideArray[indexPath.item])))
        }
        
        return item
    }
    
    func collectionView(_ collectionView: NSCollectionView, numberOfItemsInSection section: Int) -> Int {
        if collectionView.isEqual(showCollectionView) {
            return showArray.count
        } else if collectionView.isEqual(hideCollectionView) {
            return hideArray.count
        }
        return 0
    }
    
    func collectionView(_ collectionView: NSCollectionView, didSelectItemsAt indexPaths: Set<IndexPath>) {
        let indexPathArr = Array(indexPaths)
        
        if collectionView.isEqual(showCollectionView) {
            self.selectShowItemMutableArray.removeAll()
            
            if self.showArray.count > 6 {
                removeBox.borderColor = KMAppearance.Layout.h2Color()
                removeButton.isEnabled = true
            }
            
            for indexPath in indexPathArr {
                self.selectShowItemMutableArray.append(indexPath)
            }
        } else if collectionView.isEqual(hideCollectionView) {
            self.selectHideItemMutableArray.removeAll()
            
            addBox.borderColor = KMAppearance.Layout.h2Color()
            addButton.isEnabled = true
            
            for indexPath in indexPathArr {
                self.selectHideItemMutableArray.append(indexPath)
            }
        }
    }
    
    func collectionView(_ collectionView: NSCollectionView, layout collectionViewLayout: NSCollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> NSSize {
        return NSSize(width: collectionItemWidth, height: collectionItemHeight)
    }
    
    // NSCollectionViewDelegate Drag-and-Drop Methods
    
    func collectionView(_ collectionView: NSCollectionView, canDragItemsAt indexPaths: Set<IndexPath>, with event: NSEvent) -> Bool {
        return true
    }
    
    func collectionView(_ collectionView: NSCollectionView, pasteboardWriterForItemAt indexPath: IndexPath) -> NSPasteboardWriting? {
        return String(indexPath.item) as NSPasteboardWriting
    }
    
    func collectionView(_ collectionView: NSCollectionView, draggingSession session: NSDraggingSession, willBeginAt screenPoint: NSPoint, forItemsAt indexPaths: Set<IndexPath>) {
        if collectionView.isEqual(showCollectionView) {
            indexPathsOfItemsBeingShowItemDragged = indexPaths
        } else if collectionView.isEqual(hideCollectionView) {
            indexPathsOfItemsBeingHideItemDragged = indexPaths
        }
    }
    
    func collectionView(_ collectionView: NSCollectionView, validateDrop draggingInfo: NSDraggingInfo, proposedIndexPath proposedDropIndexPath: AutoreleasingUnsafeMutablePointer<NSIndexPath>, dropOperation proposedDropOperation: UnsafeMutablePointer<NSCollectionView.DropOperation>) -> NSDragOperation {
        if collectionView.isEqual(showCollectionView) {
//            if self.showArray.count <= 6 {
//                return NSDragOperation(rawValue: 0)
//            }
            if indexPathsOfItemsBeingShowItemDragged.count != 0 {
                return .move
            } else {
                return .copy
            }
        } else if collectionView.isEqual(hideCollectionView) {
            if indexPathsOfItemsBeingHideItemDragged.count != 0 {
                return .move
            } else {
                if self.showArray.count <= 6 {
                    return NSDragOperation(rawValue: 0)
                }
                return .copy
            }
        }
        return []
    }
    
    func collectionView(_ collectionView: NSCollectionView, acceptDrop draggingInfo: NSDraggingInfo, indexPath: IndexPath, dropOperation: NSCollectionView.DropOperation) -> Bool {
        var result = false
        if collectionView.isEqual(showCollectionView) {
            if indexPathsOfItemsBeingShowItemDragged.count != 0 {
                var toItemIndex = indexPath.item
                for fromIndexPath in indexPathsOfItemsBeingShowItemDragged {
                    let fromItemIndex = fromIndexPath.item
                    if fromItemIndex > toItemIndex {
                        moveCell(fromIndex: fromItemIndex, toIndex: toItemIndex, collectionView: collectionView)
                        collectionView.animator().moveItem(at: fromIndexPath, to: IndexPath(item: toItemIndex, section: indexPath.section))
                        toItemIndex += 1
                    }
                }
                var adjustedToItemIndex = indexPath.item
                for fromIndexPath in indexPathsOfItemsBeingShowItemDragged.reversed() {
                    let fromItemIndex = fromIndexPath.item
                    if fromItemIndex < adjustedToItemIndex {
                        if adjustedToItemIndex >= showArray.count {
                            adjustedToItemIndex = showArray.count - 1
                        }
                        moveCell(fromIndex: fromItemIndex, toIndex: adjustedToItemIndex, collectionView: collectionView)
                        let adjustedToIndexPath = IndexPath(item: adjustedToItemIndex, section: indexPath.section)
                        collectionView.animator().moveItem(at: fromIndexPath, to: adjustedToIndexPath)
                        adjustedToItemIndex -= 1
                    }
                }
                result = true
            } else if indexPathsOfItemsBeingHideItemDragged.count != 0 {
                let toItemIndex = indexPathsOfItemsBeingHideItemDragged.first!.item
                showArray.insert((hideArray[toItemIndex] as! Int) as NSNumber, at: indexPath.item)
                hideArray.remove(at: toItemIndex)
                result = true
                
                self.dataChange?(self, showArray)
            }
        } else if collectionView.isEqual(hideCollectionView) {
            if indexPathsOfItemsBeingHideItemDragged.count != 0 {
                var toItemIndex = indexPath.item
                for fromIndexPath in indexPathsOfItemsBeingHideItemDragged {
                    let fromItemIndex = fromIndexPath.item
                    if fromItemIndex > toItemIndex {
                        moveCell(fromIndex: fromItemIndex, toIndex: toItemIndex, collectionView: collectionView)
                        collectionView.animator().moveItem(at: fromIndexPath, to: IndexPath(item: toItemIndex, section: indexPath.section))
                        toItemIndex += 1
                    }
                }
                var adjustedToItemIndex = indexPath.item - 1
                for fromIndexPath in indexPathsOfItemsBeingHideItemDragged.reversed() {
                    let fromItemIndex = fromIndexPath.item
                    if fromItemIndex < adjustedToItemIndex {
                        if adjustedToItemIndex >= showArray.count {
                            adjustedToItemIndex = showArray.count - 1
                        }
                        moveCell(fromIndex: fromItemIndex, toIndex: adjustedToItemIndex, collectionView: collectionView)
                        let adjustedToIndexPath = IndexPath(item: adjustedToItemIndex, section: indexPath.section)
                        collectionView.animator().moveItem(at: fromIndexPath, to: adjustedToIndexPath)
                        adjustedToItemIndex -= 1
                    }
                }
                result = true
            } else if indexPathsOfItemsBeingShowItemDragged.count != 0 {
                if self.showArray.count <= 6 {
                    return false
                }
                let toItemIndex = indexPathsOfItemsBeingShowItemDragged.first!.item
                hideArray.insert((showArray[toItemIndex] as! Int) as NSNumber, at: indexPath.item)
                showArray.remove(at: toItemIndex)
                result = true
                
                self.dataChange?(self, showArray)
            }
        }
        return result
    }
    
    func collectionView(_ collectionView: NSCollectionView, draggingSession session: NSDraggingSession, endedAt screenPoint: NSPoint, dragOperation operation: NSDragOperation) {
        if collectionView.isEqual(showCollectionView) {
            indexPathsOfItemsBeingShowItemDragged.removeAll()
            removeBox.borderColor = KMAppearance.Layout.h2Color()
            removeButton.isEnabled = false
        } else if collectionView.isEqual(hideCollectionView) {
            indexPathsOfItemsBeingHideItemDragged.removeAll()
            addBox.borderColor = KMAppearance.Layout.h2Color()
            addButton.isEnabled = false
        }
        showCollectionView.reloadSections(IndexSet(integer: 0))
        hideCollectionView.reloadSections(IndexSet(integer: 0))
    }
}

extension KMHomeQuickToolsCollectionView {
    func itemReturnedWidthValue(withShowArray showArr: [Any], hideArray hideArr: [Any], fontSize: CGFloat, height: CGFloat) -> CGFloat {
       var itemWidth: CGFloat = 0.0
       
       if showArr.count != 0 {
           for number in showArr {
               let value = KMQucikToolsModel(type: DataNavigationViewButtonActionType(rawValue: Int(truncating: number as! NSNumber))).titleString()
               let rect = value.boundingRect(with: CGSize(width: CGFloat.greatestFiniteMagnitude, height: height), options: .usesLineFragmentOrigin, attributes: [NSAttributedString.Key.font: NSFont.systemFont(ofSize: fontSize)], context: nil)
               if itemWidth < rect.size.width {
                   itemWidth = rect.size.width
               }
           }
       }
       
        if hideArr.count != 0 {
           for number in hideArr {
               let value = KMQucikToolsModel(type: DataNavigationViewButtonActionType(rawValue: Int(truncating: number as! NSNumber))).titleString()
               let rect = value.boundingRect(with: CGSize(width: CGFloat.greatestFiniteMagnitude, height: height), options: .usesLineFragmentOrigin, attributes: [NSAttributedString.Key.font: NSFont.systemFont(ofSize: fontSize)], context: nil)
               if itemWidth < rect.size.width {
                   itemWidth = rect.size.width
               }
           }
       }
       
       return itemWidth
   }

}