import Foundation
import UIKit
import ComponentFlow
import Display
import TelegramCore
import TelegramPresentationData
import MultilineTextComponent
import AvatarNode
import AccountContext

public final class PeerTableCellComponent: Component {
    let context: AccountContext
    let theme: PresentationTheme
    let strings: PresentationStrings
    let peer: EnginePeer?

    public init(
        context: AccountContext,
        theme: PresentationTheme,
        strings: PresentationStrings,
        peer: EnginePeer?
    ) {
        self.context = context
        self.theme = theme
        self.strings = strings
        self.peer = peer
    }

    public static func ==(lhs: PeerTableCellComponent, rhs: PeerTableCellComponent) -> Bool {
        if lhs.context !== rhs.context {
            return false
        }
        if lhs.theme !== rhs.theme {
            return false
        }
        if lhs.strings !== rhs.strings {
            return false
        }
        if lhs.peer != rhs.peer {
            return false
        }
        return true
    }

    public final class View: UIView {
        private let avatarNode: AvatarNode
        private let text = ComponentView<Empty>()
                
        private var component: PeerTableCellComponent?
        private weak var state: EmptyComponentState?
        
        override init(frame: CGRect) {
            self.avatarNode = AvatarNode(font: avatarPlaceholderFont(size: 12.0))
                                         
            super.init(frame: frame)
            
            self.addSubnode(self.avatarNode)
        }
        
        required init?(coder: NSCoder) {
            fatalError("init(coder:) has not been implemented")
        }
        
        func update(component: PeerTableCellComponent, availableSize: CGSize, state: EmptyComponentState, environment: Environment<Empty>, transition: ComponentTransition) -> CGSize {
            self.component = component
            self.state = state
                                    
            let avatarSize = CGSize(width: 22.0, height: 22.0)
            let spacing: CGFloat = 6.0
            
            var peerName: String
            let avatarOverride: AvatarNodeImageOverride?
            if let peerValue = component.peer {
                peerName = peerValue.compactDisplayTitle
                if peerName.count > 40 {
                    peerName = "\(peerName.prefix(40))…"
                }
                avatarOverride = nil
            } else {
                peerName = component.strings.Gift_View_HiddenName
                avatarOverride = .anonymousSavedMessagesIcon(isColored: true)
            }
            
            let avatarNaturalSize = CGSize(width: 40.0, height: 40.0)
            self.avatarNode.setPeer(context: component.context, theme: component.theme, peer: component.peer, overrideImage: avatarOverride)
            self.avatarNode.bounds = CGRect(origin: .zero, size: avatarNaturalSize)
            
            let textSize = self.text.update(
                transition: .immediate,
                component: AnyComponent(
                    MultilineTextComponent(
                        text: .plain(NSAttributedString(string: peerName, font: Font.regular(15.0), textColor: component.peer != nil ? component.theme.list.itemAccentColor : component.theme.list.itemPrimaryTextColor, paragraphAlignment: .left))
                    )
                ),
                environment: {},
                containerSize: CGSize(width: availableSize.width - avatarSize.width - spacing, height: availableSize.height)
            )
            
            let size = CGSize(width: avatarSize.width + textSize.width + spacing, height: textSize.height)
            
            let avatarFrame = CGRect(origin: CGPoint(x: 0.0, y: floorToScreenPixels((size.height - avatarSize.height) / 2.0)), size: avatarSize)
            self.avatarNode.frame = avatarFrame
            
            if let view = self.text.view {
                if view.superview == nil {
                    self.addSubview(view)
                }
                let textFrame = CGRect(origin: CGPoint(x: avatarSize.width + spacing, y: floorToScreenPixels((size.height - textSize.height) / 2.0)), size: textSize)
                transition.setFrame(view: view, frame: textFrame)
            }
            
            return size
        }
    }

    public func makeView() -> View {
        return View(frame: CGRect())
    }

    public func update(view: View, availableSize: CGSize, state: EmptyComponentState, environment: Environment<Empty>, transition: ComponentTransition) -> CGSize {
        return view.update(component: self, availableSize: availableSize, state: state, environment: environment, transition: transition)
    }
}