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

private func generateBoostIcon(theme: PresentationTheme) -> UIImage? {
    let size = CGSize(width: 28.0, height: 28.0)
    return generateImage(size, contextGenerator: { size, context in
        let bounds = CGRect(origin: .zero, size: size)
        context.clear(bounds)
        
        context.addEllipse(in: bounds.insetBy(dx: 1.0, dy: 1.0))
        context.clip()
        
        var locations: [CGFloat] = [1.0, 0.0]
        let colors: [CGColor] = [UIColor(rgb: 0x36c089).cgColor, UIColor(rgb: 0x3ca5eb).cgColor]
        
        let colorSpace = CGColorSpaceCreateDeviceRGB()
        let gradient = CGGradient(colorsSpace: colorSpace, colors: colors as CFArray, locations: &locations)!
        
        context.drawLinearGradient(gradient, start: CGPoint(x: 0.0, y: 0.0), end: CGPoint(x: size.width, y: size.height), options: CGGradientDrawingOptions())
        
        if let image = generateTintedImage(image: UIImage(bundleImageName: "Chat/Attach Menu/Location"), color: .white), let cgImage = image.cgImage {
            context.draw(cgImage, in: bounds.insetBy(dx: 6.0, dy: 6.0))
        }
        
        context.resetClip()
        
        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)
}

private final class WebAppLocationAlertContentNode: 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 validLayout: CGSize?
    
    override var dismissOnOutsideTap: Bool {
        return self.isUserInteractionEnabled
    }
    
    init(context: AccountContext, theme: AlertControllerTheme, ptheme: PresentationTheme, strings: PresentationStrings, accountPeer: EnginePeer, botPeer: 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
        
        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)
        }
                
        self.updateTheme(theme)
        
        self.avatarNode.setPeer(context: context, theme: ptheme, peer: accountPeer)
        self.secondAvatarNode.setPeer(context: context, theme: ptheme, peer: botPeer)
    }
    
    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
        
        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)
        
        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 + 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 webAppLocationAlertController(context: AccountContext, accountPeer: EnginePeer, botPeer: EnginePeer, completion: @escaping (Bool) -> Void) -> AlertController {
    let presentationData = context.sharedContext.currentPresentationData.with { $0 }
    let strings = presentationData.strings
    
    //TODO:localize
    let text = "**\(botPeer.compactDisplayTitle)** requests access to your **location**. You will be able to revoke this access in the profile page of **\(botPeer.compactDisplayTitle)**."
    
    var dismissImpl: ((Bool) -> Void)?
    var contentNode: WebAppLocationAlertContentNode?
    let actions: [TextAlertAction] = [TextAlertAction(type: .genericAction, title: "Decline", action: {
        dismissImpl?(true)
        completion(false)
    }), TextAlertAction(type: .defaultAction, title: "Allow", action: {
        dismissImpl?(true)
        completion(true)
    })]
    
    contentNode = WebAppLocationAlertContentNode(context: context, theme: AlertControllerTheme(presentationData: presentationData), ptheme: presentationData.theme, strings: strings, accountPeer: accountPeer, botPeer: botPeer, 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
}