/*
* 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 protocol TextFieldDelegate : UITextFieldDelegate {}

public class TextField : UITextField {
	/**
	This property is the same as clipsToBounds. It crops any of the view's
	contents from bleeding past the view's frame. If an image is set using
	the image property, then this value does not need to be set, since the
	visualLayer's maskToBounds is set to true by default.
	*/
	public var masksToBounds: Bool {
		get {
			return layer.masksToBounds
		}
		set(value) {
			layer.masksToBounds = value
		}
	}
	
	/// A property that accesses the backing layer's backgroundColor.
	public override var backgroundColor: UIColor? {
		didSet {
			layer.backgroundColor = backgroundColor?.CGColor
		}
	}
	
	/// A property that accesses the layer.frame.origin.x property.
	public var x: CGFloat {
		get {
			return layer.frame.origin.x
		}
		set(value) {
			layer.frame.origin.x = value
		}
	}
	
	/// A property that accesses the layer.frame.origin.y property.
	public var y: CGFloat {
		get {
			return layer.frame.origin.y
		}
		set(value) {
			layer.frame.origin.y = value
		}
	}
	
	/**
	A property that accesses the layer.frame.origin.width property.
	When setting this property in conjunction with the shape property having a
	value that is not .None, the height will be adjusted to maintain the correct
	shape.
	*/
	public var width: CGFloat {
		get {
			return layer.frame.size.width
		}
		set(value) {
			layer.frame.size.width = value
			if .None != shape {
				layer.frame.size.height = value
			}
		}
	}
	
	/**
	A property that accesses the layer.frame.origin.height property.
	When setting this property in conjunction with the shape property having a
	value that is not .None, the width will be adjusted to maintain the correct
	shape.
	*/
	public var height: CGFloat {
		get {
			return layer.frame.size.height
		}
		set(value) {
			layer.frame.size.height = value
			if .None != shape {
				layer.frame.size.width = value
			}
		}
	}
	
	/// A property that accesses the backing layer's shadowColor.
	public var shadowColor: UIColor? {
		didSet {
			layer.shadowColor = shadowColor?.CGColor
		}
	}
	
	/// A property that accesses the backing layer's shadowOffset.
	public var shadowOffset: CGSize {
		get {
			return layer.shadowOffset
		}
		set(value) {
			layer.shadowOffset = value
		}
	}
	
	/// A property that accesses the backing layer's shadowOpacity.
	public var shadowOpacity: Float {
		get {
			return layer.shadowOpacity
		}
		set(value) {
			layer.shadowOpacity = value
		}
	}
	
	/// A property that accesses the backing layer's shadowRadius.
	public var shadowRadius: CGFloat {
		get {
			return layer.shadowRadius
		}
		set(value) {
			layer.shadowRadius = value
		}
	}
	
	/**
	A property that sets the shadowOffset, shadowOpacity, and shadowRadius
	for the backing layer. This is the preferred method of setting depth
	in order to maintain consitency across UI objects.
	*/
	public var depth: MaterialDepth = .None {
		didSet {
			let value: MaterialDepthType = MaterialDepthToValue(depth)
			shadowOffset = value.offset
			shadowOpacity = value.opacity
			shadowRadius = value.radius
		}
	}
	
	/**
	A property that sets the cornerRadius of the backing layer. If the shape
	property has a value of .Circle when the cornerRadius is set, it will
	become .None, as it no longer maintains its circle shape.
	*/
	public var cornerRadiusPreset: MaterialRadius = .None {
		didSet {
			if let v: MaterialRadius = cornerRadiusPreset {
				cornerRadius = MaterialRadiusToValue(v)
				if .Circle == shape {
					shape = .None
				}
			}
		}
	}
	
	/// A property that accesses the layer.cornerRadius.
	public var cornerRadius: CGFloat = 0 {
		didSet {
			layer.cornerRadius = cornerRadius
		}
	}
	
	/**
	A property that manages the overall shape for the object. If either the
	width or height property is set, the other will be automatically adjusted
	to maintain the shape of the object.
	*/
	public var shape: MaterialShape = .None {
		didSet {
			if .None != shape {
				if width < height {
					frame.size.width = height
				} else {
					frame.size.height = width
				}
			}
		}
	}
	
	/// A preset property to set the borderWidth.
	public var borderWidthPreset: MaterialBorder = .None {
		didSet {
			borderWidth = MaterialBorderToValue(borderWidthPreset)
		}
	}

	/// A property that accesses the layer.borderWith.
	public var borderWidth: CGFloat = 0 {
		didSet {
			layer.borderWidth = borderWidth
		}
	}
	
	/// A property that accesses the layer.borderColor property.
	public var borderColor: UIColor? {
		didSet {
			layer.borderColor = borderColor?.CGColor
		}
	}
	
	/// A property that accesses the layer.position property.
	public var position: CGPoint {
		get {
			return layer.position
		}
		set(value) {
			layer.position = value
		}
	}
	
	/// A property that accesses the layer.zPosition property.
	public var zPosition: CGFloat {
		get {
			return layer.zPosition
		}
		set(value) {
			layer.zPosition = value
		}
	}
	
	/// The UIImage for the clear icon.
	public var clearButton: UIButton? {
		didSet {
			if let v: UIButton = clearButton {
				clearButtonMode = .Never
				rightViewMode = .WhileEditing
				v.contentEdgeInsets = UIEdgeInsetsZero
				v.addTarget(self, action: "handleClearButton", forControlEvents: .TouchUpInside)
			} else {
				clearButtonMode = .WhileEditing
				rightViewMode = .Never
			}
			rightView = clearButton
			reloadView()
		}
	}
	
	/// The bottom border layer.
	public private(set) lazy var bottomBorderLayer: CAShapeLayer = CAShapeLayer()
	
	/**
	A property that sets the distance between the textField and
	bottomBorderLayer.
	*/
	public var bottomBorderLayerDistance: CGFloat = 4
	
	/**
	The title UILabel that is displayed when there is text. The
	titleLabel text value is updated with the placeholder text 
	value before being displayed.
	*/
	public var titleLabel: UILabel? {
		didSet {
			prepareTitleLabel()
		}
	}
	
	/// The color of the titleLabel text when the textField is not active.
	public var titleLabelColor: UIColor? {
		didSet {
			titleLabel?.textColor = titleLabelColor
			MaterialAnimation.animationDisabled { [unowned self] in
				self.bottomBorderLayer.backgroundColor = self.titleLabelColor?.CGColor
			}
		}
	}
	
	/// The color of the titleLabel text when the textField is active.
	public var titleLabelActiveColor: UIColor?
	
	/**
	A property that sets the distance between the textField and
	titleLabel.
	*/
	public var titleLabelAnimationDistance: CGFloat = 8
	
	/// An override to the text property.
	public override var text: String? {
		didSet {
			textFieldDidChange()
		}
	}
	
	/**
	The detail UILabel that is displayed when the detailLabelHidden property
	is set to false.
	*/
	public var detailLabel: UILabel? {
		didSet {
			prepareDetailLabel()
		}
	}
	
	/**
	The color of the detailLabel text when the detailLabelHidden property
	is set to false.
	*/
	public var detailLabelActiveColor: UIColor? {
		didSet {
			if !detailLabelHidden {
				detailLabel?.textColor = detailLabelActiveColor
				MaterialAnimation.animationDisabled { [unowned self] in
					self.bottomBorderLayer.backgroundColor = self.detailLabelActiveColor?.CGColor
				}
			}
		}
	}
	
	/**
	A property that sets the distance between the textField and
	detailLabel.
	*/
	public var detailLabelAnimationDistance: CGFloat = 8
	
	/**
	A Boolean that indicates the detailLabel should hide
	automatically when text changes.
	*/
	public var detailLabelAutoHideEnabled: Bool = true
	
	/**
	:name:	detailLabelHidden
	*/
	public var detailLabelHidden: Bool = true {
		didSet {
			if detailLabelHidden {
				detailLabel?.textColor = titleLabelColor
				MaterialAnimation.animationDisabled { [unowned self] in
					self.bottomBorderLayer.backgroundColor = self.editing ? self.titleLabelActiveColor?.CGColor : self.titleLabelColor?.CGColor
				}
				hideDetailLabel()
			} else {
				detailLabel?.textColor = detailLabelActiveColor
				MaterialAnimation.animationDisabled { [unowned self] in
					self.bottomBorderLayer.backgroundColor = self.detailLabelActiveColor?.CGColor
				}
				showDetailLabel()
			}
		}
	}
	
	/// A wrapper for searchBar.placeholder.
	public override var placeholder: String? {
		didSet {
			if let v: String = placeholder {
				attributedPlaceholder = NSAttributedString(string: v, attributes: [NSForegroundColorAttributeName: placeholderTextColor])
			}
		}
	}
	
	/// Placeholder textColor.
	public var placeholderTextColor: UIColor = MaterialColor.black {
		didSet {
			if let v: String = placeholder {
				attributedPlaceholder = NSAttributedString(string: v, attributes: [NSForegroundColorAttributeName: placeholderTextColor])
			}
		}
	}
	
	/**
	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)
		prepareView()
	}
	
	/**
	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)
		prepareView()
	}
	
	/// A convenience initializer.
	public convenience init() {
		self.init(frame: CGRectNull)
	}
	
	/// Overriding the layout callback for sublayers.
	public override func layoutSublayersOfLayer(layer: CALayer) {
		super.layoutSublayersOfLayer(layer)
		if self.layer == layer {
			bottomBorderLayer.frame = CGRectMake(0, bounds.height + bottomBorderLayerDistance, bounds.width, 1)
			layoutShape()
		}
	}
	
	/**
	A method that accepts CAAnimation objects and executes them on the
	view's backing layer.
	- Parameter animation: A CAAnimation instance.
	*/
	public func animate(animation: CAAnimation) {
		animation.delegate = self
		if let a: CABasicAnimation = animation as? CABasicAnimation {
			a.fromValue = (nil == layer.presentationLayer() ? layer : layer.presentationLayer() as! CALayer).valueForKeyPath(a.keyPath!)
		}
		if let a: CAPropertyAnimation = animation as? CAPropertyAnimation {
			layer.addAnimation(a, forKey: a.keyPath!)
		} else if let a: CAAnimationGroup = animation as? CAAnimationGroup {
			layer.addAnimation(a, forKey: nil)
		} else if let a: CATransition = animation as? CATransition {
			layer.addAnimation(a, forKey: kCATransition)
		}
	}
	
	/**
	A delegation method that is executed when the backing layer starts
	running an animation.
	- Parameter anim: The currently running CAAnimation instance.
	*/
	public override func animationDidStart(anim: CAAnimation) {
		(delegate as? MaterialAnimationDelegate)?.materialAnimationDidStart?(anim)
	}
	
	/**
	A delegation method that is executed when the backing layer stops
	running an animation.
	- Parameter anim: The CAAnimation instance that stopped running.
	- Parameter flag: A boolean that indicates if the animation stopped
	because it was completed or interrupted. True if completed, false
	if interrupted.
	*/
	public override func animationDidStop(anim: CAAnimation, finished flag: Bool) {
		if anim is CAPropertyAnimation {
			(delegate as? MaterialAnimationDelegate)?.materialAnimationDidStop?(anim, finished: flag)
		} else if let a: CAAnimationGroup = anim as? CAAnimationGroup {
			for x in a.animations! {
				animationDidStop(x, finished: true)
			}
		}
	}
	
	/**
	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 func prepareView() {
		backgroundColor = MaterialColor.white
		shadowColor = MaterialColor.black
		borderColor = MaterialColor.black
		masksToBounds = false
		clearButtonMode = .WhileEditing
		prepareBottomBorderLayer()
	}
	
	/// Reloads the view.
	public func reloadView() {
		/// Prepare the clearButton.
		if let v: UIButton = clearButton {
			v.frame = CGRectMake(0, 0, height, height)
		}
	}
	
	
	/// Clears the textField text.
	internal func handleClearButton() {
		text = ""
		sendActionsForControlEvents(.ValueChanged)
	}
	
	/// Ahdnler when text value changed.
	internal func textFieldValueChanged() {
		if detailLabelAutoHideEnabled && !detailLabelHidden {
			detailLabelHidden = true
			MaterialAnimation.animationDisabled { [unowned self] in
				self.bottomBorderLayer.backgroundColor = self.titleLabelActiveColor?.CGColor
			}
		}
	}
	
	/// Handler for text editing began.
	internal func textFieldDidBegin() {
		titleLabel?.textColor = titleLabelActiveColor
		MaterialAnimation.animationDisabled { [unowned self] in
			self.bottomBorderLayer.backgroundColor = self.detailLabelHidden ? self.titleLabelActiveColor?.CGColor : self.detailLabelActiveColor?.CGColor
		}
	}
	
	/// Handler for text changed.
	internal func textFieldDidChange() {
		if 0 < text?.utf16.count {
			showTitleLabel()
		} else if 0 == text?.utf16.count {
			hideTitleLabel()
		}
		sendActionsForControlEvents(.ValueChanged)
	}
	
	/// Handler for text editing ended.
	internal func textFieldDidEnd() {
		if 0 < text?.utf16.count {
			showTitleLabel()
		} else if 0 == text?.utf16.count {
			hideTitleLabel()
		}
		titleLabel?.textColor = titleLabelColor
		MaterialAnimation.animationDisabled { [unowned self] in
			self.bottomBorderLayer.backgroundColor = self.detailLabelHidden ? self.titleLabelColor?.CGColor : self.detailLabelActiveColor?.CGColor
		}
	}
	
	/// Manages the layout for the shape of the view instance.
	internal func layoutShape() {
		if .Circle == shape {
			layer.cornerRadius = width / 2
		}
	}
	
	/// Prepares the titleLabel property.
	private func prepareTitleLabel() {
		if let v: UILabel = titleLabel {
			v.hidden = true
			addSubview(v)
			if 0 < text?.utf16.count {
				showTitleLabel()
			} else {
				v.alpha = 0
			}
			addTarget(self, action: "textFieldDidBegin", forControlEvents: .EditingDidBegin)
			addTarget(self, action: "textFieldDidChange", forControlEvents: .EditingChanged)
			addTarget(self, action: "textFieldDidEnd", forControlEvents: .EditingDidEnd)
		}
	}
	
	/// Prepares the detailLabel property.
	private func prepareDetailLabel() {
		if let v: UILabel = detailLabel {
			v.hidden = true
			addSubview(v)
			if detailLabelHidden {
				v.alpha = 0
			} else {
				showDetailLabel()
			}
			if nil == titleLabel {
				addTarget(self, action: "textFieldDidBegin", forControlEvents: .EditingDidBegin)
				addTarget(self, action: "textFieldDidChange", forControlEvents: .EditingChanged)
				addTarget(self, action: "textFieldDidEnd", forControlEvents: .EditingDidEnd)
			}
			addTarget(self, action: "textFieldValueChanged", forControlEvents: .ValueChanged)
		}
	}
	
	/// Prepares the bottomBorderLayer property.
	private func prepareBottomBorderLayer() {
		layer.addSublayer(bottomBorderLayer)
	}
	
	/// Shows and animates the titleLabel property.
	private func showTitleLabel() {
		if let v: UILabel = titleLabel {
			if v.hidden {
				if let s: String = placeholder {
					if 0 == v.text?.utf16.count || nil == v.text {
						v.text = s
					}
				}
				let h: CGFloat = ceil(v.font.lineHeight)
				v.frame = CGRectMake(0, -h, bounds.width, h)
				v.hidden = false
				UIView.animateWithDuration(0.25, animations: { [unowned self] in
					v.alpha = 1
					v.frame.origin.y -= self.titleLabelAnimationDistance
				})
			}
		}
	}
	
	/// Hides and animates the titleLabel property.
	private func hideTitleLabel() {
		if let v: UILabel = titleLabel {
			UIView.animateWithDuration(0.25, animations: { [unowned self] in
				v.alpha = 0
				v.frame.origin.y += self.titleLabelAnimationDistance
			}) { _ in
				v.hidden = true
			}
		}
	}
	
	/// Shows and animates the detailLabel property.
	private func showDetailLabel() {
		if let v: UILabel = detailLabel {
			if v.hidden {
				let h: CGFloat = ceil(v.font.lineHeight)
				v.frame = CGRectMake(0, bounds.height + bottomBorderLayerDistance, bounds.width, h)
				v.hidden = false
				UIView.animateWithDuration(0.25, animations: { [unowned self] in
					v.frame.origin.y = self.frame.height + self.bottomBorderLayerDistance + self.detailLabelAnimationDistance
					v.alpha = 1
				})
			}
		}
	}
	
	/// Hides and animates the detailLabel property.
	private func hideDetailLabel() {
		if let v: UILabel = detailLabel {
			UIView.animateWithDuration(0.25, animations: { [unowned self] in
				v.alpha = 0
				v.frame.origin.y -= self.detailLabelAnimationDistance
			}) { _ in
				v.hidden = true
			}
		}
	}
}