//
//  AlbumTableCellView.swift
//  TagTunes
//
//  Created by Kim Wittenburg on 28.08.15.
//  Copyright © 2015 Kim Wittenburg. All rights reserved.
//

import Cocoa
import AppKitPlus
import SearchAPI

/// A table cell view to represent an `Album`.
public class AlbumTableCellView: AdvancedTableCellView {
    
    // MARK: Types
    
    private struct Constants {
        static let secondaryImageViewWidth: CGFloat = 17
    }
    
    // MARK: Properties
    
    /// Returns the receiver's `imageView` as an `AsyncImageView`. This property
    /// replaces the `imageView` property.
    ///
    /// Intended to be used as accessory view.
    @IBOutlet public var asyncImageView: AsyncImageView! = {
        let imageView = AsyncImageView()
        imageView.imageScaling = .ScaleProportionallyUpOrDown
        imageView.translatesAutoresizingMaskIntoConstraints = false
        return imageView
    }()
    
    /// Intended to be used as accessory view.
    ///
    /// Contains the *tick* image for saved albums.
    @IBOutlet public lazy var secondaryImageView: NSImageView! = {
        let secondaryImageView = NSImageView()
        secondaryImageView.image = NSImage(named: "Tick")?.imageByMaskingWithColor(NSColor.clearColor())
        secondaryImageView.imageScaling = .ScaleProportionallyDown
        secondaryImageView.translatesAutoresizingMaskIntoConstraints = false
        return secondaryImageView
        }()

    /// Intended to be used as accessory view.
    ///
    /// Displayed for loading albums.
    @IBOutlet public lazy var loadingIndicator: NSProgressIndicator! = {
        let loadingIndicator = NSProgressIndicator()
        loadingIndicator.style = .SpinningStyle
        loadingIndicator.indeterminate = true
        loadingIndicator.controlSize = .SmallControlSize
        loadingIndicator.translatesAutoresizingMaskIntoConstraints = false
        return loadingIndicator
        }()
    
    @IBOutlet public lazy var errorButton: NSButton! = {
        let errorButton = NSButton()
        errorButton.setButtonType(NSButtonType.MomentaryChangeButton)
        errorButton.bezelStyle = NSBezelStyle.ShadowlessSquareBezelStyle
        errorButton.bordered = false
        errorButton.imagePosition = .ImageOnly
        errorButton.image = NSImage(named: NSImageNameCaution)
        errorButton.translatesAutoresizingMaskIntoConstraints = false
        return errorButton
    }()
    
    // MARK: Initializers
    
    override public func setupView() {
        style = .Subtitle
        primaryTextField?.font = NSFont.boldSystemFontOfSize(0)
        setLeftAccessoryView(asyncImageView, withConstraints: [NSLayoutConstraint(
            item: asyncImageView,
            attribute: .Width,
            relatedBy: .Equal,
            toItem: asyncImageView,
            attribute: .Height,
            multiplier: 1,
            constant: 0)])
        super.setupView()
    }
    
    // MARK: Overrides
    
    /// The receiver's imageView.
    ///
    /// - attention: Use `asyncImageView` instead.
    override public var imageView: NSImageView? {
        set {
            asyncImageView = newValue as? AsyncImageView
        }
        get {
            return asyncImageView
        }
    }
    
    // MARK: Methods
    
    /// Configures the receiver to display the specified `album`.
    ///
    /// - parameters:
    ///   - albumItem: The album to be displayed.
    ///   - height: The height the cell view is going to have. This is used to
    ///             apropriately scale the album's artwork.
    public func setupForAlbumItem(albumItem: AlbumItem, height: CGFloat) {
        textField?.stringValue = Preferences.sharedPreferences.useCensoredNames ? albumItem.album.censoredName : albumItem.album.name
        secondaryTextField?.stringValue = albumItem.album.artist.name
        asyncImageView.downloadImageFromURL(albumItem.album.artwork.optimalArtworkURLForImageSize(height))
        switch albumItem.loadingState {
        case .Loading:
            textField?.textColor = NSColor.disabledControlTextColor()
            rightAccessoryView = loadingIndicator
        case .Error:
            textField?.textColor = NSColor.redColor()
            rightAccessoryView = errorButton
        case .Normal:
            textField?.textColor = NSColor.controlTextColor()
            if albumItem.saved {
                let aspectRatioConstraint = NSLayoutConstraint(
                    item: secondaryImageView,
                    attribute: .Width,
                    relatedBy: .Equal,
                    toItem: secondaryImageView,
                    attribute: .Height,
                    multiplier: 1,
                    constant: 0)
                let widthConstraint = NSLayoutConstraint(
                    item: secondaryImageView,
                    attribute: .Width,
                    relatedBy: .Equal,
                    toItem: nil,
                    attribute: .Width,
                    multiplier: 1,
                    constant: Constants.secondaryImageViewWidth)
                setRightAccessoryView(secondaryImageView, withConstraints: [aspectRatioConstraint, widthConstraint])
            } else {
                rightAccessoryView = nil
            }
        }
    }

    /// Configures the cell to display the specified `album`. This method should
    /// be used to display search results.
    ///
    /// - parameters:
    ///   - album: The `Album` to be displayed.
    ///   - enabled: Wether the cell should appear *enabled*. If not it draws its
    ///              text in a gray color.
    ///   - height: The height the cell view is going to have. This is used to
    ///             appropriately scale the album's artwork.
    public func setupForAlbum(album: Album, enabled: Bool, height: CGFloat) {
        textField?.stringValue = Preferences.sharedPreferences.useCensoredNames ? album.censoredName : album.name
        textField?.textColor = NSColor.controlTextColor()
        secondaryTextField?.stringValue = album.artist.name
        textField?.textColor = enabled ? NSColor.textColor() : NSColor.disabledControlTextColor()
        secondaryTextField?.textColor = enabled ? NSColor.secondaryLabelColor() : NSColor.disabledControlTextColor()
        asyncImageView.downloadImageFromURL(album.artwork.optimalArtworkURLForImageSize(height))
        asyncImageView.enabled = enabled
    }

}