//
//  CombinedView.swift
//  Stats
//
//  Created by Serhiy Mytrovtsiy on 09/01/2023
//  Using Swift 5.0
//  Running on macOS 13.1
//
//  Copyright © 2023 Serhiy Mytrovtsiy. All rights reserved.
//

import Cocoa
import Kit

internal class CombinedView: NSObject, NSGestureRecognizerDelegate {
    private var menuBarItem: NSStatusItem? = nil
    private var view: NSView = NSView(frame: NSRect(x: 0, y: 0, width: 0, height: Constants.Widget.height))
    private var popup: PopupWindow? = nil
    
    private var status: Bool {
        Store.shared.bool(key: "CombinedModules", defaultValue: false)
    }
    private var spacing: CGFloat {
        CGFloat(Int(Store.shared.string(key: "CombinedModules_spacing", defaultValue: "")) ?? 0)
    }
    private var separator: Bool {
        Store.shared.bool(key: "CombinedModules_separator", defaultValue: false)
    }
    
    private var activeModules: [Module] {
        modules.filter({ $0.enabled }).sorted(by: { $0.combinedPosition < $1.combinedPosition })
    }
    
    private var combinedModulesPopup: Bool {
        get { Store.shared.bool(key: "CombinedModules_popup", defaultValue: true) }
        set { Store.shared.set(key: "CombinedModules_popup", value: newValue) }
    }
    
    override init() {
        super.init()
        
        modules.forEach { (m: Module) in
            m.menuBar.callback = { [weak self] in
                if let s = self?.status, s {
                    DispatchQueue.main.async(execute: {
                        self?.recalculate()
                    })
                }
            }
        }
        
        self.popup = PopupWindow(title: "Combined modules", module: .combined, view: Popup()) { _ in }
        
        if self.status {
            self.enable()
        }
        
        NotificationCenter.default.addObserver(self, selector: #selector(listenForOneView), name: .toggleOneView, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(listenForModuleRearrrange), name: .moduleRearrange, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(listenCombinedModulesPopup), name: .combinedModulesPopup, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(listenForModule), name: .toggleModule, object: nil)
    }
    
    deinit {
        NotificationCenter.default.removeObserver(self, name: .toggleOneView, object: nil)
        NotificationCenter.default.removeObserver(self, name: .moduleRearrange, object: nil)
        NotificationCenter.default.removeObserver(self, name: .combinedModulesPopup, object: nil)
        NotificationCenter.default.removeObserver(self, name: .toggleModule, object: nil)
    }
    
    public func enable() {
        self.menuBarItem = NSStatusBar.system.statusItem(withLength: 0)
        DispatchQueue.main.async(execute: {
            self.menuBarItem?.autosaveName = "CombinedModules"
        })
        self.menuBarItem?.button?.addSubview(self.view)
        self.menuBarItem?.button?.image = NSImage()
        self.menuBarItem?.button?.toolTip = localizedString("Combined modules")
        
        if !self.combinedModulesPopup {
            self.activeModules.forEach { (m: Module) in
                m.menuBar.widgets.forEach { w in
                    w.item.onClick = {
                        if let window = w.item.window {
                            NotificationCenter.default.post(name: .togglePopup, object: nil, userInfo: [
                                "module": m.name,
                                "widget": w.type,
                                "origin": window.frame.origin,
                                "center": window.frame.width/2
                            ])
                        }
                    }
                }
            }
        } else {
            self.menuBarItem?.button?.target = self
            self.menuBarItem?.button?.action = #selector(self.togglePopup)
            self.menuBarItem?.button?.sendAction(on: [.leftMouseDown, .rightMouseDown])
        }
        
        DispatchQueue.main.async(execute: {
            self.recalculate()
        })
    }
    
    public func disable() {
        self.activeModules.forEach { (m: Module) in
            m.menuBar.widgets.forEach { w in
                w.item.onClick = nil
            }
        }
        if let item = self.menuBarItem {
            NSStatusBar.system.removeStatusItem(item)
        }
        self.menuBarItem = nil
    }
    
    private func recalculate() {
        self.view.subviews.forEach({ $0.removeFromSuperview() })
        
        var w: CGFloat = 0
        var i: Int = 0
        self.activeModules.forEach { (m: Module) in
            self.view.addSubview(m.menuBar.view)
            self.view.subviews[i].setFrameOrigin(NSPoint(x: w, y: 0))
            w += m.menuBar.view.frame.width + self.spacing
            i += 1

            if self.separator && i < 2 * self.activeModules.count - 1 {
                let separator = NSView(frame: NSRect(x: w, y: 3, width: 1, height: Constants.Widget.height-6))
                separator.wantsLayer = true
                separator.layer?.backgroundColor = (separator.isDarkMode ? NSColor.black : NSColor.white).cgColor
                self.view.addSubview(separator)
                w += 3 + self.spacing
                i += 1
            }
        }
        self.view.setFrameSize(NSSize(width: w, height: self.view.frame.height))
        self.menuBarItem?.length = w
    }
    
    // call when popup appear/disappear
    private func visibilityCallback(_ state: Bool) {}
    
    @objc private func togglePopup(_ sender: NSButton) {
        guard let popup = self.popup, let item = self.menuBarItem, let window = item.button?.window else { return }
        let openedWindows = NSApplication.shared.windows.filter{ $0 is NSPanel }
        openedWindows.forEach{ $0.setIsVisible(false) }
        
        if popup.occlusionState.rawValue == 8192 {
            NSApplication.shared.activate(ignoringOtherApps: true)
            
            popup.contentView?.invalidateIntrinsicContentSize()
            
            let windowCenter = popup.contentView!.intrinsicContentSize.width / 2
            var x = window.frame.origin.x - windowCenter + window.frame.width/2
            let y = window.frame.origin.y - popup.contentView!.intrinsicContentSize.height - 3
            
            let maxWidth = NSScreen.screens.map{ $0.frame.width }.reduce(0, +)
            if x + popup.contentView!.intrinsicContentSize.width > maxWidth {
                x = maxWidth - popup.contentView!.intrinsicContentSize.width - 3
            }
            
            popup.setFrameOrigin(NSPoint(x: x, y: y))
            popup.setIsVisible(true)
        } else {
            popup.setIsVisible(false)
        }
    }
    
    @objc private func listenForOneView(_ notification: Notification) {
        guard notification.userInfo?["module"] == nil else { return }
        
        if self.status {
            self.enable()
        } else {
            self.disable()
        }
    }
    
    @objc private func listenForModuleRearrrange() {
        self.recalculate()
    }
    
    @objc private func listenCombinedModulesPopup() {
        if !self.combinedModulesPopup {
            self.activeModules.forEach { (m: Module) in
                m.menuBar.widgets.forEach { w in
                    w.item.onClick = {
                        if let window = w.item.window {
                            NotificationCenter.default.post(name: .togglePopup, object: nil, userInfo: [
                                "module": m.name,
                                "widget": w.type,
                                "origin": window.frame.origin,
                                "center": window.frame.width/2
                            ])
                        }
                    }
                }
            }
            self.menuBarItem?.button?.action = nil
        } else {
            self.activeModules.forEach { (m: Module) in
                m.menuBar.widgets.forEach { w in
                    w.item.onClick = nil
                }
            }
            
            self.menuBarItem?.button?.target = self
            self.menuBarItem?.button?.action = #selector(self.togglePopup)
            self.menuBarItem?.button?.sendAction(on: [.leftMouseDown, .rightMouseDown])
        }
    }
    
    @objc private func listenForModule(_ notification: Notification) {
        guard let name = notification.userInfo?["module"] as? String,
              let state = notification.userInfo?["state"] as? Bool,
              state,
              let module = self.activeModules.first(where: { $0.name == name }) else { return }
        
        module.menuBar.widgets.forEach { w in
            w.item.onClick = {
                if let window = w.item.window {
                    NotificationCenter.default.post(name: .togglePopup, object: nil, userInfo: [
                        "module": module.name,
                        "widget": w.type,
                        "origin": window.frame.origin,
                        "center": window.frame.width/2
                    ])
                }
            }
        }
    }
}

private class Popup: NSStackView, Popup_p {
    fileprivate var keyboardShortcut: [UInt16] = []
    fileprivate var sizeCallback: ((NSSize) -> Void)? = nil
    
    init() {
        self.keyboardShortcut = Store.shared.array(key: "CombinedModules_popup_keyboardShortcut", defaultValue: []) as? [UInt16] ?? []
        
        super.init(frame: NSRect(x: 0, y: 0, width: Constants.Popup.width, height: 0))
        
        self.orientation = .vertical
        self.distribution = .fill
        self.alignment = .width
        self.spacing = Constants.Popup.spacing
        
        self.reinit()
        
        NotificationCenter.default.addObserver(self, selector: #selector(reinit), name: .toggleModule, object: nil)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    deinit {
        NotificationCenter.default.removeObserver(self, name: .toggleOneView, object: nil)
    }
    
    fileprivate func settings() -> NSView? { return nil }
    fileprivate func appear() {}
    fileprivate func disappear() {}
    fileprivate func setKeyboardShortcut(_ binding: [UInt16]) {
        self.keyboardShortcut = binding
        Store.shared.set(key: "CombinedModules_popup_keyboardShortcut", value: binding)
    }
    
    @objc private func reinit() {
        self.subviews.forEach({ $0.removeFromSuperview() })
        
        let availableModules = modules.filter({ $0.enabled && $0.portal != nil })
        availableModules.forEach { (m: Module) in
            if let p = m.portal {
                self.addArrangedSubview(p)
            }
        }
        
        let h = CGFloat(availableModules.count) * Constants.Popup.portalHeight + (CGFloat(availableModules.count-1)*Constants.Popup.spacing)
        if h > 0 {
            self.setFrameSize(NSSize(width: self.frame.width, height: h))
            self.sizeCallback?(self.frame.size)
        }
    }
}