/*
 * Copyright (C) 2015 - 2016, Daniel Dahan and CosmicMind, Inc. <http://cosmicmind.com>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *	*	Redistributions of source code must retain the above copyright notice, this
 *		list of conditions and the following disclaimer.
 *
 *	*	Redistributions in binary form must reproduce the above copyright notice,
 *		this list of conditions and the following disclaimer in the documentation
 *		and/or other materials provided with the distribution.
 *
 *	*	Neither the name of CosmicMind nor the names of its
 *		contributors may be used to endorse or promote products derived from
 *		this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import UIKit

private var ToolbarContext: UInt8 = 0

open class Toolbar: Bar {
	/// A convenience property to set the titleLabel text.
	open var title: String? {
		get {
			return titleLabel.text
		}
		set(value) {
			titleLabel.text = value
			layoutSubviews()
		}
	}
	
	/// Title label.
    open fileprivate(set) lazy var titleLabel = UILabel()
    
	/// A convenience property to set the detailLabel text.
	open var detail: String? {
		get {
			return detailLabel.text
		}
		set(value) {
			detailLabel.text = value
			layoutSubviews()
		}
	}
	
	/// Detail label.
    open fileprivate(set) lazy var detailLabel = UILabel()
	
    deinit {
        removeObserver(self, forKeyPath: "titleLabel.textAlignment")
    }
    
	/**
     An initializer that initializes the object with a NSCoder object.
     - Parameter aDecoder: A NSCoder instance.
     */
	public required init?(coder aDecoder: NSCoder) {
		super.init(coder: aDecoder)
	}
	
	/**
     An initializer that initializes the object with a CGRect object.
     If AutoLayout is used, it is better to initilize the instance
     using the init() initializer.
     - Parameter frame: A CGRect instance.
     */
	public override init(frame: CGRect) {
		super.init(frame: frame)
	}
	
    open override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        guard "titleLabel.textAlignment" == keyPath else {
            super.observeValue(forKeyPath: keyPath, of: object, change: change, context: context)
            return
        }
        contentViewAlignment = .center == titleLabel.textAlignment ? .center : .full
    }
    
    /// Reloads the view.
    open override func reload() {
        super.reload()
        
        if nil != title && "" != title {
            if nil == titleLabel.superview {
                contentView.addSubview(titleLabel)
            }
            titleLabel.frame = contentView.bounds
        } else {
            titleLabel.removeFromSuperview()
        }
        
        if nil != detail && "" != detail {
            if nil == detailLabel.superview {
                contentView.addSubview(detailLabel)
            }
            
            if nil == titleLabel.superview {
                detailLabel.frame = contentView.bounds
            } else {
                titleLabel.sizeToFit()
                detailLabel.sizeToFit()
                
                let diff: CGFloat = (contentView.height - titleLabel.height - detailLabel.height) / 2
                
                titleLabel.height += diff
                titleLabel.width = contentView.width
                
                detailLabel.height += diff
                detailLabel.width = contentView.width
                detailLabel.y = titleLabel.height
            }
        } else {
            detailLabel.removeFromSuperview()
        }
    }

	/**
     Prepares the view instance when intialized. When subclassing,
     it is recommended to override the prepare method
     to initialize property values and other setup operations.
     The super.prepare method should always be called immediately
     when subclassing.
     */
	open override func prepare() {
		super.prepare()
        contentViewAlignment = .center
		prepareTitleLabel()
		prepareDetailLabel()
	}
	
	/// Prepares the titleLabel.
    private func prepareTitleLabel() {
        titleLabel.textAlignment = .center
        titleLabel.contentScaleFactor = Screen.scale
		titleLabel.font = RobotoFont.medium(with: 17)
        titleLabel.textColor = Color.darkText.primary
        addObserver(self, forKeyPath: "titleLabel.textAlignment", options: [], context: &ToolbarContext)
	}
	
	/// Prepares the detailLabel.
	private func prepareDetailLabel() {
        detailLabel.textAlignment = .center
        detailLabel.contentScaleFactor = Screen.scale
		detailLabel.font = RobotoFont.regular(with: 12)
        detailLabel.textColor = Color.darkText.secondary
	}
}
