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

private func generateBoostIcon(theme: PresentationTheme) -> UIImage? {
    if let image = UIImage(bundleImageName: "Premium/AvatarBoost") {
        let size = CGSize(width: image.size.width + 4.0, height: image.size.height + 4.0)
        return generateImage(size, contextGenerator: { size, context in
            let bounds = CGRect(origin: .zero, size: size)
            context.clear(bounds)
            if let cgImage = image.cgImage {
                context.draw(cgImage, in: CGRect(origin: CGPoint(x: 2.0, y: 2.0), size: image.size))
            }
            
            let lineWidth = 2.0 - UIScreenPixel
            context.setLineWidth(lineWidth)
            context.setStrokeColor(theme.actionSheet.opaqueItemBackgroundColor.cgColor)
            context.strokeEllipse(in: bounds.insetBy(dx: lineWidth / 2.0 + UIScreenPixel, dy: lineWidth / 2.0 + UIScreenPixel))
        }, opaque: false)
    }
    return nil
}

private final class PreviousBoostNode: ASDisplayNode {
    let checkNode: InteractiveCheckNode
    let avatarNode: AvatarNode
    let labelNode: ImmediateTextNode
    
    var pressed: (PreviousBoostNode) -> Void = { _ in }
    
    init(context: AccountContext, theme: AlertControllerTheme, ptheme: PresentationTheme, peer: EnginePeer, badge: String?) {
        self.checkNode = InteractiveCheckNode(theme: CheckNodeTheme(backgroundColor: theme.accentColor, strokeColor: theme.contrastColor, borderColor: theme.controlBorderColor, overlayBorder: false, hasInset: false, hasShadow: false))
        self.checkNode.setSelected(false, animated: false)
       
        self.labelNode = ImmediateTextNode()
        self.labelNode.maximumNumberOfLines = 4
        self.labelNode.isUserInteractionEnabled = true
        self.labelNode.attributedText = NSAttributedString(string: peer.compactDisplayTitle, font: Font.semibold(13.0), textColor: theme.primaryColor)
        
        self.avatarNode = AvatarNode(font: avatarPlaceholderFont(size: 13.0))
        
        super.init()
        
        self.addSubnode(self.checkNode)
        self.addSubnode(self.avatarNode)
        self.addSubnode(self.labelNode)
        
        self.avatarNode.setPeer(context: context, theme: ptheme, peer: peer)
        
        self.checkNode.valueChanged = { [weak self] value in
            if let self {
                if value {
                    self.pressed(self)
                }
            }
        }
    }
    
    func updateLayout(size: CGSize, transition: ContainedViewLayoutTransition) -> CGSize {
        let checkSize = CGSize(width: 22.0, height: 22.0)
        let condensedSize = CGSize(width: size.width - 76.0, height: size.height)
        let avatarSize = CGSize(width: 30.0, height: 30.0)
        
        let labelSize = self.labelNode.updateLayout(condensedSize)
        transition.updateFrame(node: self.checkNode, frame: CGRect(origin: CGPoint(x: 12.0, y: -2.0), size: checkSize))
        transition.updateFrame(node: self.avatarNode, frame: CGRect(origin: CGPoint(x: 46.0, y: -8.0), size: avatarSize))
        
        transition.updateFrame(node: self.labelNode, frame: CGRect(origin: CGPoint(x: 84.0, y: 0.0), size: labelSize))
        
        return CGSize(width: size.width, height: checkSize.height)
    }
    
    func setChecked(_ checked: Bool) {
        self.checkNode.setSelected(checked, animated: false)
    }
}

private final class ReplaceBoostConfirmationAlertContentNode: AlertContentNode {
    private let strings: PresentationStrings
    private let text: String
    
    private let textNode: ASTextNode
    private let avatarNode: AvatarNode
    private let arrowNode: ASImageNode
    private let secondAvatarNode: AvatarNode
    private let iconNode: ASImageNode
    
    private let actionNodesSeparator: ASDisplayNode
    private let actionNodes: [TextAlertContentActionNode]
    private let actionVerticalSeparators: [ASDisplayNode]
    
    private var boostNodes: [PreviousBoostNode] = []
    
    private var validLayout: CGSize?
    
    override var dismissOnOutsideTap: Bool {
        return self.isUserInteractionEnabled
    }
    
    init(context: AccountContext, theme: AlertControllerTheme, ptheme: PresentationTheme, strings: PresentationStrings, fromPeers: [EnginePeer], toPeer: EnginePeer, text: String, actions: [TextAlertAction]) {
        self.strings = strings
        self.text = text
        
        self.textNode = ASTextNode()
        self.textNode.maximumNumberOfLines = 0
        
        self.avatarNode = AvatarNode(font: avatarPlaceholderFont(size: 26.0))
        
        self.arrowNode = ASImageNode()
        self.arrowNode.displaysAsynchronously = false
        self.arrowNode.displayWithoutProcessing = true
        
        self.secondAvatarNode = AvatarNode(font: avatarPlaceholderFont(size: 26.0))
        
        self.iconNode = ASImageNode()
        self.iconNode.displaysAsynchronously = false
        self.iconNode.image = generateBoostIcon(theme: ptheme)
        
        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
        
        var boostNodes: [PreviousBoostNode] = []
        if fromPeers.count > 1 {
            for peer in fromPeers {
                let boostNode = PreviousBoostNode(context: context, theme: theme, ptheme: ptheme, peer: peer, badge: nil)
                if boostNodes.isEmpty {
                    boostNode.setChecked(true)
                }
                boostNodes.append(boostNode)
            }
        }
        self.boostNodes = boostNodes
        
        super.init()
        
        self.addSubnode(self.textNode)
        self.addSubnode(self.avatarNode)
        self.addSubnode(self.arrowNode)
        self.addSubnode(self.secondAvatarNode)
        self.addSubnode(self.iconNode)
    
        self.addSubnode(self.actionNodesSeparator)
        
        for actionNode in self.actionNodes {
            self.addSubnode(actionNode)
        }
        
        for separatorNode in self.actionVerticalSeparators {
            self.addSubnode(separatorNode)
        }
        
        for boostNode in self.boostNodes {
            boostNode.pressed = { [weak self] sender in
                if let self {
                    for node in self.boostNodes {
                        node.setChecked(node === sender)
                    }
                }
            }
            self.addSubnode(boostNode)
        }
        
        self.updateTheme(theme)
        
        self.avatarNode.setPeer(context: context, theme: ptheme, peer: fromPeers.first!)
        self.secondAvatarNode.setPeer(context: context, theme: ptheme, peer: toPeer)
    }
    
    override func updateTheme(_ theme: AlertControllerTheme) {
        self.textNode.attributedText = parseMarkdownIntoAttributedString(self.text, attributes: MarkdownAttributes(
            body: MarkdownAttributeSet(font: Font.regular(13.0), textColor: theme.primaryColor),
            bold: MarkdownAttributeSet(font: Font.semibold(13.0), textColor: theme.primaryColor),
            link: MarkdownAttributeSet(font: Font.regular(13.0), textColor: theme.primaryColor),
            linkAttribute: { url in
                return ("URL", url)
            }
        ), textAlignment: .center)
        self.arrowNode.image = generateTintedImage(image: UIImage(bundleImageName: "Peer Info/AlertArrow"), color: theme.secondaryColor)
        
        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) - 44.0, y: origin.y), size: avatarSize)
        transition.updateFrame(node: self.avatarNode, frame: avatarFrame)
        
        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 secondAvatarFrame = CGRect(origin: CGPoint(x: floorToScreenPixels((size.width - avatarSize.width) / 2.0) + 44.0, y: origin.y), size: avatarSize)
        transition.updateFrame(node: self.secondAvatarNode, frame: secondAvatarFrame)
        
        if let icon = self.iconNode.image {
            let iconFrame = CGRect(origin: CGPoint(x: avatarFrame.maxX + 4.0 - icon.size.width, y: avatarFrame.maxY + 4.0 - icon.size.height), size: icon.size)
            transition.updateFrame(node: self.iconNode, frame: iconFrame)
        }
        
        origin.y += avatarSize.height + 10.0
        
        var entriesHeight: CGFloat = 0.0
        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))
        origin.y += textSize.height + 10.0
        
        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)
        
        if !self.boostNodes.isEmpty {
            origin.y += 17.0
            for boostNode in self.boostNodes {
                let boostSize = boostNode.updateLayout(size: size, transition: transition)
                transition.updateFrame(node: boostNode, frame: CGRect(origin: CGPoint(x: 36.0, y: origin.y), size: boostSize))
                
                entriesHeight += boostSize.height + 20.0
                origin.y += boostSize.height + 20.0
            }
        }
        
        var actionsHeight: CGFloat = 0.0
        switch effectiveActionLayout {
            case .horizontal:
                actionsHeight = actionButtonHeight
            case .vertical:
                actionsHeight = actionButtonHeight * CGFloat(self.actionNodes.count)
        }
        
        let resultSize = CGSize(width: contentWidth, height: avatarSize.height + textSize.height + entriesHeight + actionsHeight + 16.0 + insets.top + insets.bottom)
        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
    }
}

func replaceBoostConfirmationController(context: AccountContext, fromPeers: [EnginePeer], toPeer: EnginePeer, commit: @escaping () -> Void) -> AlertController {
    let presentationData = context.sharedContext.currentPresentationData.with { $0 }
    let strings = presentationData.strings
    
    let text = strings.ChannelBoost_ReplaceBoost(fromPeers.first!.compactDisplayTitle, toPeer.compactDisplayTitle).string
    
    var dismissImpl: ((Bool) -> Void)?
    var contentNode: ReplaceBoostConfirmationAlertContentNode?
    let actions: [TextAlertAction] = [TextAlertAction(type: .genericAction, title: presentationData.strings.Common_Cancel, action: {
        dismissImpl?(true)
    }), TextAlertAction(type: .defaultAction, title: strings.ChannelBoost_Replace, action: {
        dismissImpl?(true)
        commit()
    })]
    
    contentNode = ReplaceBoostConfirmationAlertContentNode(context: context, theme: AlertControllerTheme(presentationData: presentationData), ptheme: presentationData.theme, strings: strings, fromPeers: fromPeers, toPeer: toPeer, text: text, actions: actions)
    
    let controller = AlertController(theme: AlertControllerTheme(presentationData: presentationData), contentNode: contentNode!)
    dismissImpl = { [weak controller] animated in
        if animated {
            controller?.dismissAnimated()
        } else {
            controller?.dismiss()
        }
    }
    return controller
}