/*
* Copyright (C) 2015 - 2016, Daniel Dahan and CosmicMind, Inc. <http://cosmicmind.io>.
* 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 Material 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

public class NavigationBarView : MaterialView {
	/// TitleView that holds the titleLabel and detailLabel.
	public private(set) lazy var titleView: MaterialView = MaterialView()
	
	/// Device status bar style.
	public var statusBarStyle: UIStatusBarStyle = UIApplication.sharedApplication().statusBarStyle {
		didSet {
			UIApplication.sharedApplication().statusBarStyle = statusBarStyle
		}
	}
	
	/// Title label.
	public var titleLabel: UILabel? {
		didSet {
			if let v: UILabel = titleLabel {
				titleView.addSubview(v)
			}
			reloadView()
		}
	}
	
	/// Detail label.
	public var detailLabel: UILabel? {
		didSet {
			if let v: UILabel = detailLabel {
				titleView.addSubview(v)
			}
			reloadView()
		}
	}
	
	/// Left side UIControls.
	public var leftControls: Array<UIControl>? {
		didSet {
			reloadView()
		}
	}
	
	/// Right side UIControls.
	public var rightControls: Array<UIControl>? {
		didSet {
			reloadView()
		}
	}
	
	/**
	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)
	}
	
	/// A convenience initializer.
	public convenience init() {
		self.init(frame: CGRectMake(0, 0, UIScreen.mainScreen().bounds.width, 64))
	}
	
	/**
	A convenience initializer with parameter settings.
	- Parameter titleLabel: UILabel for the title.
	- Parameter detailLabel: UILabel for the details.
	- Parameter leftControls: An Array of UIControls that go on the left side.
	- Parameter rightControls: An Array of UIControls that go on the right side.
	*/
	public convenience init?(titleLabel: UILabel? = nil, detailLabel: UILabel? = nil, leftControls: Array<UIControl>? = nil, rightControls: Array<UIControl>? = nil) {
		self.init(frame: CGRectMake(0, 0, UIScreen.mainScreen().bounds.width, 64))
		prepareProperties(titleLabel, detailLabel: detailLabel, leftControls: leftControls, rightControls: rightControls)
	}
	
	public override func layoutSubviews() {
		super.layoutSubviews()
		
		// General alignment.
		switch UIDevice.currentDevice().orientation {
		case .LandscapeLeft, .LandscapeRight:
			grid.contentInset.top = 0
			grid.contentInset.bottom = 0
			titleView.grid.spacing = 2
			titleView.grid.contentInset.top = 4
			titleView.grid.contentInset.bottom = 8
			height = 44
		default:
			grid.contentInset.top = 20
			grid.contentInset.bottom = 8
			titleView.grid.spacing = 0
			titleView.grid.contentInset.top = 0
			titleView.grid.contentInset.bottom = 0
			height = 64
		}
		
		// TitleView alignment.
		titleView.grid.axis.rows = 6
		if let v: UILabel = titleLabel {
			titleView.grid.views?.append(v)
			v.grid.rows = nil == detailLabel ? 6 : 4
		}
		if let v: UILabel = detailLabel {
			titleView.grid.views?.append(v)
			v.grid.rows = 2
		}
		
		// Column adjustment.
		width = UIScreen.mainScreen().bounds.width
		grid.axis.columns = Int(width / 48)
		reloadView()
	}
	
	public override func didMoveToSuperview() {
		super.didMoveToSuperview()
		reloadView()
	}
	
	public override func intrinsicContentSize() -> CGSize {
		return CGSizeMake(UIScreen.mainScreen().bounds.width, 64)
	}
	
	/// Reloads the view.
	public func reloadView() {
		layoutIfNeeded()
		
		// clear constraints so new ones do not conflict
		removeConstraints(constraints)
		for v in subviews {
			if v != titleView {
				v.removeFromSuperview()
			}
		}
		
		// Size of single grid column.
		let g: CGFloat = width / CGFloat(0 < grid.axis.columns ? grid.axis.columns : 1)
		
		grid.views = []
		titleView.grid.columns = grid.axis.columns
		
		// leftControls
		if let v: Array<UIControl> = leftControls {
			for c in v {
				let w: CGFloat = c.intrinsicContentSize().width
				if let b: UIButton = c as? UIButton {
					b.contentEdgeInsets = UIEdgeInsetsZero
				}
				
				c.grid.columns = 0 == g ? 1 : Int(ceil(w / g))
				titleView.grid.columns -= c.grid.columns
				
				addSubview(c)
				grid.views?.append(c)
			}
		}
		
		grid.views?.append(titleView)
		
		// rightControls
		if let v: Array<UIControl> = rightControls {
			for c in v {
				let w: CGFloat = c.intrinsicContentSize().width
				if let b: UIButton = c as? UIButton {
					b.contentEdgeInsets = UIEdgeInsetsZero
				}
				
				c.grid.columns = 0 == g ? 1 : Int(ceil(w / g))
				titleView.grid.columns -= c.grid.columns
				
				addSubview(c)
				grid.views?.append(c)
			}
		}
		
		titleView.grid.columns -= titleView.grid.offset.columns
		
		grid.reloadLayout()
		
		titleView.grid.views = []
		titleView.grid.axis.rows = 6
		if let v: UILabel = titleLabel {
			titleView.grid.views?.append(v)
		}
		if let v: UILabel = detailLabel {
			titleView.grid.views?.append(v)
		}
		titleView.grid.reloadLayout()
	}
	
	/**
	Prepares the view instance when intialized. When subclassing,
	it is recommended to override the prepareView method
	to initialize property values and other setup operations.
	The super.prepareView method should always be called immediately
	when subclassing.
	*/
	public override func prepareView() {
		super.prepareView()
		grid.spacing = 8
		grid.axis.inherited = false
		grid.contentInset.top = 20
		grid.contentInset.left = 8
		grid.contentInset.bottom = 8
		grid.contentInset.right = 8
		depth = .Depth1
		prepareTitleView()
	}
	
	/// Prepares the titleView.
	public func prepareTitleView() {
		titleView.backgroundColor = nil
		titleView.grid.axis.inherited = false
		titleView.grid.axis.direction = .Vertical
		addSubview(titleView)
	}
	
	/**
	Used to trigger property changes  that initializers avoid.
	- Parameter titleLabel: UILabel for the title.
	- Parameter detailLabel: UILabel for the details.
	- Parameter leftControls: An Array of UIControls that go on the left side.
	- Parameter rightControls: An Array of UIControls that go on the right side.
	*/
	internal func prepareProperties(titleLabel: UILabel?, detailLabel: UILabel?, leftControls: Array<UIControl>?, rightControls: Array<UIControl>?) {
		self.titleLabel = titleLabel
		self.detailLabel = detailLabel
		self.leftControls = leftControls
		self.rightControls = rightControls
	}
}
