//
//  BubbleKnowledgeView.swift
//  QuickLocation
//

import UIKit

final class BubbleKnowledgeView: UIView {

    lazy var navView = BaseNavigationView(title: "气泡知识")

    private let gradientLayer: CAGradientLayer = {
        let layer = CAGradientLayer()
        layer.colors = [
            UIColor(hexStr: "#E7FFF2").cgColor,
            UIColor.white.cgColor
        ]
        layer.locations = [0, 0.28]
        layer.startPoint = CGPoint(x: 0.5, y: 0)
        layer.endPoint = CGPoint(x: 0.5, y: 1)
        return layer
    }()

    private let scrollView: UIScrollView = {
        let view = UIScrollView()
        view.alwaysBounceVertical = true
        view.showsVerticalScrollIndicator = false
        return view
    }()

    private let contentImageView: UIImageView = {
        let view = UIImageView(image: UIImage(named: "Bubble/knowledge"))
        view.contentMode = .scaleAspectFit
        return view
    }()

    override init(frame: CGRect) {
        super.init(frame: frame)
        backgroundColor = .white
        setupUI()
    }

    required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }

    override func layoutSubviews() {
        super.layoutSubviews()
        gradientLayer.frame = bounds
    }

    private func setupUI() {
        layer.insertSublayer(gradientLayer, at: 0)

        addSubview(navView)
        navView.layoutChain.top().edgesHorzontal().height(kNaviHeight)

        addSubview(scrollView)
        scrollView.layoutChain.topToBottomOfView(navView).edgesHorzontal().bottom()
        scrollView.addSubview(contentImageView)
        contentImageView.layoutChain
            .top(8)
            .left(16)
            .right(16)
            .widthToView(scrollView, offset: -32)
            .heightToWidth(1450.0 / 676.0)
            .bottom(24)
    }
}