import UIKit

// MARK: - DetailsHeaderView.Configuration

extension DetailsHeaderView {
    struct Configuration {
        /// Show debug background colors
        let debug = false
        
        let defaultSpacing: CGFloat = 35
        let smallerSpacing: CGFloat = 24
        
        let topMargin: CGFloat = 0
        // defaultSpacing - spacing on top of first cell (i.e. 35 - 17)
        let bottomMargin: CGFloat = 18
    }
}

/// Header view for a details screen
///
/// - Note: This views margins don't include safe areas automatically. Either set them yourself or set constraints to
///         `safeAreaLayoutGuide`s.
final class DetailsHeaderView: UIStackView {
    
    /// Set to update shown profile
    var profileContentConfiguration: DetailsHeaderProfileView.ContentConfiguration {
        didSet {
            detailsHeaderProfileView.contentConfiguration = profileContentConfiguration
        }
    }
    
    // MARK: - Private properties
    
    private let profilePictureTapped: () -> Void
    
    private let quickActions: [QuickAction]
    private let mediaAndPollsQuickActions: [QuickAction]
    
    private let configuration: Configuration
        
    // MARK: - Subviews
    
    private lazy var detailsHeaderProfileView = DetailsHeaderProfileView(
        with: profileContentConfiguration,
        profilePictureTapped: profilePictureTapped
    )
    
    private lazy var quickActionsView = QuickActionsView(quickActions: quickActions)
    
    private lazy var mediaAndPollsQuickActionsView = QuickActionsView(
        quickActions: mediaAndPollsQuickActions,
        shadow: false
    )
            
    // MARK: - Initialization
    
    init(
        with contentConfiguration: DetailsHeaderProfileView.ContentConfiguration,
        profilePictureTapped: @escaping () -> Void,
        quickActions: [QuickAction] = [],
        mediaAndPollsQuickActions: [QuickAction] = [],
        configuration: Configuration = Configuration()
    ) {
        self.profileContentConfiguration = contentConfiguration
        self.profilePictureTapped = profilePictureTapped
        self.quickActions = quickActions
        self.mediaAndPollsQuickActions = mediaAndPollsQuickActions
        self.configuration = configuration
        
        super.init(frame: .zero)
        
        configureView()
    }
    
    @available(*, unavailable, message: "Use init(for:delegate:with:)")
    required init(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
        
    // MARK: - Configuration
    
    private func configureView() {

        axis = .vertical
        spacing = configuration.defaultSpacing

        directionalLayoutMargins = NSDirectionalEdgeInsets(
            top: configuration.topMargin,
            leading: 0,
            bottom: configuration.bottomMargin,
            trailing: 0
        )
        isLayoutMarginsRelativeArrangement = true
        
        if configuration.debug {
            backgroundColor = .systemGreen
        }
        
        addArrangedSubview(detailsHeaderProfileView)
        setCustomSpacing(configuration.smallerSpacing, after: detailsHeaderProfileView)
        
        if !quickActions.isEmpty {
            addArrangedSubview(quickActionsView)
        }
        
        if !mediaAndPollsQuickActions.isEmpty {
            addArrangedSubview(mediaAndPollsQuickActionsView)
        }
        
        bringSubviewToFront(detailsHeaderProfileView)
    }
    
    // MARK: - Update
    
    func reloadQuickActions() {
        quickActionsView.reload()
    }
    
    // MARK: - Action
    
    func showThreemaTypeTips() {
        // Checking both tips at once is not an issue, they can never be shown togheter
        detailsHeaderProfileView.showThreemaTypeTip()
        detailsHeaderProfileView.showThreemaWorkAvailabilityStatusTip()
    }
}