import Foundation
import UIKit
import SwiftSignalKit
import AsyncDisplayKit
import Display
import Postbox
import TelegramCore
import TelegramPresentationData
import TelegramUIPreferences
import AccountContext
import AppBundle
import AvatarNode

private final class WebAppLaunchConfirmationAlertContentNode: AlertContentNode {
    private let strings: PresentationStrings
    private let title: String
    private let text: String
    private let showMore: Bool
    
    private let titleNode: ImmediateTextNode
    private let textNode: ASTextNode
    private let avatarNode: AvatarNode
    
    private let moreButton: HighlightableButtonNode
    private let arrowNode: ASImageNode
    
    private let actionNodesSeparator: ASDisplayNode
    private let actionNodes: [TextAlertContentActionNode]
    private let actionVerticalSeparators: [ASDisplayNode]
    
    private var validLayout: CGSize?
    
    private let morePressed: () -> Void
    
    override var dismissOnOutsideTap: Bool {
        return self.isUserInteractionEnabled
    }
    
    init(context: AccountContext, theme: AlertControllerTheme, ptheme: PresentationTheme, strings: PresentationStrings, peer: EnginePeer, title: String, text: String, showMore: Bool, actions: [TextAlertAction], morePressed: @escaping () -> Void) {
        self.strings = strings
        self.title = title
        self.text = text
        self.showMore = showMore
        self.morePressed = morePressed
        
        self.titleNode = ImmediateTextNode()
        self.titleNode.displaysAsynchronously = false
        self.titleNode.maximumNumberOfLines = 1
        self.titleNode.textAlignment = .center
        
        self.textNode = ASTextNode()
        self.textNode.displaysAsynchronously = false
        self.textNode.maximumNumberOfLines = 0
        
        self.avatarNode = AvatarNode(font: avatarPlaceholderFont(size: 26.0))
        
        self.moreButton = HighlightableButtonNode()
        
        self.arrowNode = ASImageNode()
        self.arrowNode.displaysAsynchronously = false
        self.arrowNode.displayWithoutProcessing = true
        self.arrowNode.isHidden = !showMore
        self.arrowNode.contentMode = .scaleAspectFit
        
        self.actionNodesSeparator = ASDisplayNode()
        self.actionNodesSeparator.isLayerBacked = true
        
        self.actionNodes = actions.map { action -> TextAlertContentActionNode in
            return TextAlertContentActionNode(theme: theme, action: action)
        }
        
        var actionVerticalSeparators: [ASDisplayNode] = []
        if actions.count > 1 {
            for _ in 0 ..< actions.count - 1 {
                let separatorNode = ASDisplayNode()
                separatorNode.isLayerBacked = true
                actionVerticalSeparators.append(separatorNode)
            }
        }
        self.actionVerticalSeparators = actionVerticalSeparators
        
        super.init()
        
        self.addSubnode(self.titleNode)
        self.addSubnode(self.textNode)
        self.addSubnode(self.avatarNode)
        self.addSubnode(self.moreButton)
        self.moreButton.addSubnode(self.arrowNode)
    
        self.addSubnode(self.actionNodesSeparator)
        
        for actionNode in self.actionNodes {
            self.addSubnode(actionNode)
        }
        
        for separatorNode in self.actionVerticalSeparators {
            self.addSubnode(separatorNode)
        }
        
        self.updateTheme(theme)
        
        self.avatarNode.setPeer(context: context, theme: ptheme, peer: peer)
        
        self.moreButton.addTarget(self, action: #selector(self.moreButtonPressed), forControlEvents: .touchUpInside)
    }
    
    @objc private func moreButtonPressed() {
        self.morePressed()
    }
    
    override func updateTheme(_ theme: AlertControllerTheme) {
        self.titleNode.attributedText = NSAttributedString(string: self.title, font: Font.semibold(17.0), textColor: theme.primaryColor, paragraphAlignment: .center)
        self.textNode.attributedText = NSAttributedString(string: self.text, font: Font.regular(13.0), textColor: theme.primaryColor, paragraphAlignment: .center)
        
        self.moreButton.setAttributedTitle(NSAttributedString(string: self.strings.WebApp_LaunchMoreInfo, font: Font.regular(13.0), textColor: theme.accentColor), for: .normal)
        self.arrowNode.image = generateTintedImage(image: UIImage(bundleImageName: "Peer Info/AlertArrow"), color: theme.accentColor)
        
        self.actionNodesSeparator.backgroundColor = theme.separatorColor
        for actionNode in self.actionNodes {
            actionNode.updateTheme(theme)
        }
        for separatorNode in self.actionVerticalSeparators {
            separatorNode.backgroundColor = theme.separatorColor
        }
        
        if let size = self.validLayout {
            _ = self.updateLayout(size: size, transition: .immediate)
        }
    }
    
    override func updateLayout(size: CGSize, transition: ContainedViewLayoutTransition) -> CGSize {
        var size = size
        size.width = min(size.width, 270.0)
        
        self.validLayout = size
        
        var origin: CGPoint = CGPoint(x: 0.0, y: 20.0)
        
        let avatarSize = CGSize(width: 60.0, height: 60.0)
        self.avatarNode.updateSize(size: avatarSize)
        
        let avatarFrame = CGRect(origin: CGPoint(x: floorToScreenPixels((size.width - avatarSize.width) / 2.0), y: origin.y), size: avatarSize)
        transition.updateFrame(node: self.avatarNode, frame: avatarFrame)
        
        origin.y += avatarSize.height + 17.0
        
        if let arrowImage = self.arrowNode.image {
            let arrowFrame = CGRect(origin: CGPoint(x: floorToScreenPixels((size.width - arrowImage.size.width) / 2.0), y: origin.y + floorToScreenPixels((avatarSize.height - arrowImage.size.height) / 2.0)), size: arrowImage.size)
            transition.updateFrame(node: self.arrowNode, frame: arrowFrame)
        }
        
        let titleSize = self.titleNode.updateLayout(CGSize(width: size.width - 32.0, height: size.height))
        transition.updateFrame(node: self.titleNode, frame: CGRect(origin: CGPoint(x: floorToScreenPixels((size.width - titleSize.width) / 2.0), y: origin.y), size: titleSize))
        origin.y += titleSize.height + 6.0
        
        if self.showMore {
            let moreButtonSize = self.moreButton.measure(CGSize(width: size.width - 32.0, height: size.height))
            transition.updateFrame(node: self.moreButton, frame: CGRect(origin: CGPoint(x: floorToScreenPixels((size.width - moreButtonSize.width) / 2.0) - 5.0, y: origin.y), size: moreButtonSize))
            transition.updateFrame(node: self.arrowNode, frame: CGRect(origin: CGPoint(x: moreButtonSize.width + 3.0, y: 4.0), size: CGSize(width: 9.0, height: 9.0)))
            origin.y += moreButtonSize.height + 22.0
        }
        
        let textSize = self.textNode.measure(CGSize(width: size.width - 32.0, height: size.height))
        transition.updateFrame(node: self.textNode, frame: CGRect(origin: CGPoint(x: floorToScreenPixels((size.width - textSize.width) / 2.0), y: origin.y), size: textSize))
        
        let actionButtonHeight: CGFloat = 44.0
        var minActionsWidth: CGFloat = 0.0
        let maxActionWidth: CGFloat = floor(size.width / CGFloat(self.actionNodes.count))
        let actionTitleInsets: CGFloat = 8.0
        
        var effectiveActionLayout = TextAlertContentActionLayout.horizontal
        for actionNode in self.actionNodes {
            let actionTitleSize = actionNode.titleNode.updateLayout(CGSize(width: maxActionWidth, height: actionButtonHeight))
            if case .horizontal = effectiveActionLayout, actionTitleSize.height > actionButtonHeight * 0.6667 {
                effectiveActionLayout = .vertical
            }
            switch effectiveActionLayout {
                case .horizontal:
                    minActionsWidth += actionTitleSize.width + actionTitleInsets
                case .vertical:
                    minActionsWidth = max(minActionsWidth, actionTitleSize.width + actionTitleInsets)
            }
        }
        
        let insets = UIEdgeInsets(top: 18.0, left: 18.0, bottom: 18.0, right: 18.0)
        
        let contentWidth = max(size.width, minActionsWidth)
        
        var actionsHeight: CGFloat = 0.0
        switch effectiveActionLayout {
            case .horizontal:
                actionsHeight = actionButtonHeight
            case .vertical:
                actionsHeight = actionButtonHeight * CGFloat(self.actionNodes.count)
        }
        
        var resultSize = CGSize(width: contentWidth, height: avatarSize.height + titleSize.height + textSize.height + actionsHeight + 25.0 + insets.top + insets.bottom)
        if self.showMore {
            resultSize.height += 37.0
        }
        
        transition.updateFrame(node: self.actionNodesSeparator, frame: CGRect(origin: CGPoint(x: 0.0, y: resultSize.height - actionsHeight - UIScreenPixel), size: CGSize(width: resultSize.width, height: UIScreenPixel)))
        
        var actionOffset: CGFloat = 0.0
        let actionWidth: CGFloat = floor(resultSize.width / CGFloat(self.actionNodes.count))
        var separatorIndex = -1
        var nodeIndex = 0
        for actionNode in self.actionNodes {
            if separatorIndex >= 0 {
                let separatorNode = self.actionVerticalSeparators[separatorIndex]
                switch effectiveActionLayout {
                    case .horizontal:
                        transition.updateFrame(node: separatorNode, frame: CGRect(origin: CGPoint(x: actionOffset - UIScreenPixel, y: resultSize.height - actionsHeight), size: CGSize(width: UIScreenPixel, height: actionsHeight - UIScreenPixel)))
                    case .vertical:
                        transition.updateFrame(node: separatorNode, frame: CGRect(origin: CGPoint(x: 0.0, y: resultSize.height - actionsHeight + actionOffset - UIScreenPixel), size: CGSize(width: resultSize.width, height: UIScreenPixel)))
                }
            }
            separatorIndex += 1
            
            let currentActionWidth: CGFloat
            switch effectiveActionLayout {
                case .horizontal:
                    if nodeIndex == self.actionNodes.count - 1 {
                        currentActionWidth = resultSize.width - actionOffset
                    } else {
                        currentActionWidth = actionWidth
                    }
                case .vertical:
                    currentActionWidth = resultSize.width
            }
            
            let actionNodeFrame: CGRect
            switch effectiveActionLayout {
                case .horizontal:
                    actionNodeFrame = CGRect(origin: CGPoint(x: actionOffset, y: resultSize.height - actionsHeight), size: CGSize(width: currentActionWidth, height: actionButtonHeight))
                    actionOffset += currentActionWidth
                case .vertical:
                    actionNodeFrame = CGRect(origin: CGPoint(x: 0.0, y: resultSize.height - actionsHeight + actionOffset), size: CGSize(width: currentActionWidth, height: actionButtonHeight))
                    actionOffset += actionButtonHeight
            }
            
            transition.updateFrame(node: actionNode, frame: actionNodeFrame)
            
            nodeIndex += 1
        }
        
        return resultSize
    }
}

public func webAppLaunchConfirmationController(context: AccountContext, updatedPresentationData: (initial: PresentationData, signal: Signal<PresentationData, NoError>)?, peer: EnginePeer, commit: @escaping () -> Void, showMore: (() -> Void)?) -> AlertController {
    let theme = defaultDarkColorPresentationTheme
    let presentationData: PresentationData
    if let updatedPresentationData {
        presentationData = updatedPresentationData.initial
    } else {
        presentationData = context.sharedContext.currentPresentationData.with { $0 }
    }
    let strings = presentationData.strings
    
    var dismissImpl: ((Bool) -> Void)?
    var contentNode: WebAppLaunchConfirmationAlertContentNode?
    let actions: [TextAlertAction] = [TextAlertAction(type: .genericAction, title: presentationData.strings.Common_Cancel, action: {
        dismissImpl?(true)
    }), TextAlertAction(type: .defaultAction, title: presentationData.strings.Common_OK, action: {
        dismissImpl?(true)
        commit()
    })]
    
    let title = peer.compactDisplayTitle
    let text = presentationData.strings.WebApp_LaunchConfirmation
    
    contentNode = WebAppLaunchConfirmationAlertContentNode(context: context, theme: AlertControllerTheme(presentationData: presentationData), ptheme: theme, strings: strings, peer: peer, title: title, text: text, showMore: showMore != nil, actions: actions, morePressed: {
        dismissImpl?(true)
        showMore?()
    })
    
    let controller = AlertController(theme: AlertControllerTheme(presentationData: presentationData), contentNode: contentNode!)
    dismissImpl = { [weak controller] animated in
        if animated {
            controller?.dismissAnimated()
        } else {
            controller?.dismiss()
        }
    }
    return controller
}