//
// Copyright (c) 2021 Related Code - https://relatedcode.com
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

import UIKit

//-----------------------------------------------------------------------------------------------------------------------------------------------
class Library2View: UIViewController {

	@IBOutlet var viewHeader: UIView!
	@IBOutlet var labelTitle: UILabel!
	@IBOutlet var labelSubTitle: UILabel!
	@IBOutlet var imageViewProfile: UIImageView!
	@IBOutlet var segmentControl: UISegmentedControl!
	@IBOutlet var collectionView: UICollectionView!
	@IBOutlet var constraintCollectionViewHeight: NSLayoutConstraint!

	private var navigationBackgroundImage: UIImage?
	private var collections: [[String: String]] = []

	//-------------------------------------------------------------------------------------------------------------------------------------------
	override func viewDidLoad() {

		super.viewDidLoad()

		navigationBackgroundImage = navigationController?.navigationBar.backgroundImage(for: .default)
		navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)

		segmentControl.setTitleTextAttributes([NSAttributedString.Key.foregroundColor: UIColor.white], for: .selected)
		segmentControl.setTitleTextAttributes([NSAttributedString.Key.foregroundColor: AppColor.Theme], for: .normal)

		collectionView.register(UINib(nibName: "Library2Cell", bundle: nil), forCellWithReuseIdentifier: "Library2Cell")

		updateUI()
		loadData()
	}

	//-------------------------------------------------------------------------------------------------------------------------------------------
	override func viewDidLayoutSubviews() {

		constraintCollectionViewHeight.constant = collectionView.contentSize.height
	}

	//-------------------------------------------------------------------------------------------------------------------------------------------
	override func viewWillDisappear(_ animated: Bool) {

		navigationController?.navigationBar.setBackgroundImage(navigationBackgroundImage, for: .default)
	}

	//-------------------------------------------------------------------------------------------------------------------------------------------
	override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {

		super.traitCollectionDidChange(previousTraitCollection)
		updateUI()
	}

	// MARK: - Data methods
	//-------------------------------------------------------------------------------------------------------------------------------------------
	func loadData() {

		collections.removeAll()

		var dict1: [String: String] = [:]
		dict1["title"] = "Pop Music"
		dict1["songs"] = "61 songs"
		collections.append(dict1)

		var dict2: [String: String] = [:]
		dict2["title"] = "Recently Added"
		dict2["songs"] = "5 songs"
		collections.append(dict2)

		var dict3: [String: String] = [:]
		dict3["title"] = "Dance Hits"
		dict3["songs"] = "78 songs"
		collections.append(dict3)

		collections.append(dict1)
		collections.append(dict2)
		collections.append(dict3)

		refreshCollectionView()
	}

	// MARK: - Helper methods
	//-------------------------------------------------------------------------------------------------------------------------------------------
	func updateUI() {

		let background = UIColor.systemBackground.image(segmentControl.frame.size)
		let selected = AppColor.Theme.image(segmentControl.frame.size)

		segmentControl.setTitleTextAttributes([NSAttributedString.Key.foregroundColor : UIColor.white], for: .selected)
		segmentControl.setTitleTextAttributes([NSAttributedString.Key.foregroundColor : AppColor.Theme], for: .normal)
		segmentControl.setBackgroundImage(background, for: .normal, barMetrics: .default)
		segmentControl.setBackgroundImage(selected, for: .selected, barMetrics: .default)
		segmentControl.setDividerImage(AppColor.Theme.image(), forLeftSegmentState: .normal, rightSegmentState: [.normal, .highlighted, .selected], barMetrics: .default)
		segmentControl.layer.borderWidth = 1
		segmentControl.layer.borderColor = AppColor.Theme.cgColor
	}

	// MARK: - User actions
	//-------------------------------------------------------------------------------------------------------------------------------------------
	@IBAction func actionAdd(_ sender: Any) {

		print(#function)
	}

	//-------------------------------------------------------------------------------------------------------------------------------------------
	@IBAction func actionSegment(_ sender: Any) {

		print(#function)
	}

	// MARK: - Refresh methods
	//-------------------------------------------------------------------------------------------------------------------------------------------
	func refreshCollectionView() {

		collectionView.reloadData()
	}
}

// MARK: - UIScrollViewDelegate
//-----------------------------------------------------------------------------------------------------------------------------------------------
extension Library2View: UIScrollViewDelegate {

	//-------------------------------------------------------------------------------------------------------------------------------------------
	func scrollViewDidScroll(_ scrollView: UIScrollView) {

		if scrollView.contentOffset.y > viewHeader.frame.origin.y {
			navigationController?.navigationBar.setBackgroundImage(navigationBackgroundImage, for: .default)
			title = labelTitle.text
		}
		else {
			navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
			title = ""
		}
	}
}

// MARK:- UICollectionViewDataSource
//-----------------------------------------------------------------------------------------------------------------------------------------------
extension Library2View: UICollectionViewDataSource {

	//-------------------------------------------------------------------------------------------------------------------------------------------
	func numberOfSections(in collectionView: UICollectionView) -> Int {

		return 1
	}

	//-------------------------------------------------------------------------------------------------------------------------------------------
	func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

		return collections.count
	}

	//-------------------------------------------------------------------------------------------------------------------------------------------
	func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

		let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Library2Cell", for: indexPath) as! Library2Cell
		cell.bindData(index: indexPath.item, data: collections[indexPath.row])
		return cell
	}
}

// MARK:- UICollectionViewDelegate
//-----------------------------------------------------------------------------------------------------------------------------------------------
extension Library2View: UICollectionViewDelegate {

	//-------------------------------------------------------------------------------------------------------------------------------------------
	func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

		print("didSelectItemAt \(indexPath.row)")
	}
}

// MARK:- UICollectionViewDelegateFlowLayout
//-----------------------------------------------------------------------------------------------------------------------------------------------
extension Library2View: UICollectionViewDelegateFlowLayout {

	//-------------------------------------------------------------------------------------------------------------------------------------------
	func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {

		let height = view.frame.size.height
		let width = collectionView.frame.size.width

		return CGSize(width: (width - 40)/2, height: height / 3.2)
	}

	//-------------------------------------------------------------------------------------------------------------------------------------------
	func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {

		return UIEdgeInsets(top: 0, left: 15, bottom: 15, right: 15)
	}

	//-------------------------------------------------------------------------------------------------------------------------------------------
	func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {

		return 10
	}

	//-------------------------------------------------------------------------------------------------------------------------------------------
	func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {

		return 10
	}
}

// MARK: - UIColor
//-----------------------------------------------------------------------------------------------------------------------------------------------
fileprivate extension UIColor {

	//-------------------------------------------------------------------------------------------------------------------------------------------
	func image(_ size: CGSize = CGSize(width: 1, height: 1)) -> UIImage {

		return UIGraphicsImageRenderer(size: size).image { rendererContext in
			setFill()
			rendererContext.fill(CGRect(origin: .zero, size: size))
		}
	}
}