Swiftgram/TelegramUI/ThemeGridController.swift

import Foundation
import Display
import AsyncDisplayKit
import Postbox
import TelegramCore
import SwiftSignalKit

enum ThemeGridControllerMode {
    case wallpapers
    case solidColors
}

final class ThemeGridController: ViewController {
    private var controllerNode: ThemeGridControllerNode {
        return self.displayNode as! ThemeGridControllerNode
    }
    
    private let _ready = Promise<Bool>()
    override var ready: Promise<Bool> {
        return self._ready
    }
    
    private let account: Account
    private let mode: ThemeGridControllerMode
    
    private var presentationData: PresentationData
    private var presentationDataDisposable: Disposable?
    
    init(account: Account, mode: ThemeGridControllerMode) {
        self.account = account
        self.mode = mode
        self.presentationData = account.telegramApplicationContext.currentPresentationData.with { $0 }
        
        super.init(navigationBarPresentationData: NavigationBarPresentationData(presentationData: self.presentationData))
        
        switch mode {
            case .wallpapers:
                self.title = self.presentationData.strings.Wallpaper_Title
            case .solidColors:
                self.title = "Solid Colors"
        }
        self.statusBar.statusBarStyle = self.presentationData.theme.rootController.statusBar.style.style
        
        self.scrollToTop = { [weak self] in
            self?.controllerNode.scrollToTop()
        }
        
        self.presentationDataDisposable = (account.telegramApplicationContext.presentationData
        |> deliverOnMainQueue).start(next: { [weak self] presentationData in
            if let strongSelf = self {
                let previousTheme = strongSelf.presentationData.theme
                let previousStrings = strongSelf.presentationData.strings
                
                strongSelf.presentationData = presentationData
                
                if previousTheme !== presentationData.theme || previousStrings !== presentationData.strings {
                    strongSelf.updateThemeAndStrings()
                }
            }
        })
    }
    
    required public init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    deinit {
        self.presentationDataDisposable?.dispose()
    }
    
    private func updateThemeAndStrings() {
        switch mode {
            case .wallpapers:
                self.title = self.presentationData.strings.Wallpaper_Title
            case .solidColors:
                self.title = "Solid Colors"
        }
        
        self.statusBar.statusBarStyle = self.presentationData.theme.rootController.statusBar.style.style
        self.navigationBar?.updatePresentationData(NavigationBarPresentationData(presentationData: self.presentationData))
        
        if self.isNodeLoaded {
            self.controllerNode.updatePresentationData(self.presentationData)
        }
    }
    
    override func loadDisplayNode() {
        self.displayNode = ThemeGridControllerNode(account: self.account, presentationData: self.presentationData, mode: self.mode, present: { [weak self] controller, arguments in
            self?.present(controller, in: .window(.root), with: arguments, blockInteraction: true)
        }, selectCustomWallpaper: { [weak self] in
            if let strongSelf = self {
                var completionImpl: ((UIImage?) -> Void)?
                let legacyPicker = legacyImagePicker(theme: strongSelf.presentationData.theme, completion: { image in
                    completionImpl?(image)
                })
                var lastPresentationTimestamp = 0.0
                completionImpl = { [weak legacyPicker] image in
                    guard let strongSelf = self, let image = image else {
                        legacyPicker?.dismiss()
                        return
                    }
                    let timestamp = CACurrentMediaTime()
                    if timestamp < lastPresentationTimestamp + 1.0 {
                        return
                    }
                    lastPresentationTimestamp = timestamp
                    strongSelf.present(legacyWallpaperEditor(theme: strongSelf.presentationData.theme, image: image, completion: { image in
                        if let image = image {
                            self?.applyCustomWallpaperImage(image)
                            legacyPicker?.dismiss()
                        }
                    }), in: .window(.root))
                }
                
                strongSelf.present(legacyPicker, in: .window(.root), blockInteraction: true)
            }
        })
        self._ready.set(self.controllerNode.ready.get())
        
        self.displayNodeDidLoad()
    }
    
    private func applyCustomWallpaperImage(_ image: UIImage) {
        guard let data = UIImageJPEGRepresentation(image, 0.8) else {
            return
        }
        
        let resource = LocalFileMediaResource(fileId: arc4random64())
        self.account.postbox.mediaBox.storeResourceData(resource.id, data: data)
        
        let wallpaper: TelegramWallpaper = .image([TelegramMediaImageRepresentation(dimensions: image.size, resource: resource)])
        let _ = (updatePresentationThemeSettingsInteractively(postbox: self.account.postbox, { current in
            if case .color(0x000000) = wallpaper {
                return PresentationThemeSettings(chatWallpaper: wallpaper, theme: current.theme, themeAccentColor: current.themeAccentColor, fontSize: current.fontSize, automaticThemeSwitchSetting: current.automaticThemeSwitchSetting, disableAnimations: current.disableAnimations)
            }
            
            return PresentationThemeSettings(chatWallpaper: wallpaper, theme: current.theme, themeAccentColor: current.themeAccentColor, fontSize: current.fontSize, automaticThemeSwitchSetting: current.automaticThemeSwitchSetting, disableAnimations: current.disableAnimations)
        }) |> deliverOnMainQueue).start(completed: { [weak self] in
            let _ = (self?.navigationController as? NavigationController)?.popViewController(animated: true)
        })
    }
    
    override func containerLayoutUpdated(_ layout: ContainerViewLayout, transition: ContainedViewLayoutTransition) {
        super.containerLayoutUpdated(layout, transition: transition)
        
        self.controllerNode.containerLayoutUpdated(layout, navigationBarHeight: self.navigationHeight, transition: transition)
    }
}