//
//  FeatureIntroView.swift
//  QuickLocation
//

import UIKit

struct FeatureIntroItem {
    let imageName: String
    let accessibilityTitle: String
    let aspectRatio: CGFloat
    let action: FeatureIntroAction
}

enum FeatureIntroAction {
    case signIn
    case createBubble
    case lockDistract
    case pigeonMessage
    case searchLocation
    case sos
    case placeholder
}

final class FeatureIntroView: UIView {

    var onTapItem: ((FeatureIntroAction) -> Void)?

    private let headerBackgroundView = UIImageView(image: UIImage(named: "Explore/header_bg"))
    private let titleContainer = UIStackView()
    private let titleLineView = UIView()
    private let titleLabel = UILabel()
    private let sheetView = UIView()
    private let scrollView = UIScrollView()
    private let contentView = UIView()
    private let gridStack = UIStackView()

    private let items: [FeatureIntroItem] = [
        FeatureIntroItem(
            imageName: "Explore/sign_in_card",
            accessibilityTitle: "还在吗",
            aspectRatio: 127 / 166,
            action: .signIn
        ),
        FeatureIntroItem(
            imageName: "Explore/pigeon_message_card",
            accessibilityTitle: "飞鸽传书",
            aspectRatio: 127 / 166,
            action: .pigeonMessage
        ),
        FeatureIntroItem(
            imageName: "Explore/lock_distract_card",
            accessibilityTitle: "一键锁机",
            aspectRatio: 130 / 166,
            action: .lockDistract
        ),
        FeatureIntroItem(
            imageName: "Explore/bubble_card",
            accessibilityTitle: "隐身气泡",
            aspectRatio: 130 / 166,
            action: .createBubble
        ),
        FeatureIntroItem(
            imageName: "Explore/search_location_card",
            accessibilityTitle: "查位置",
            aspectRatio: 130 / 166,
            action: .searchLocation
        ),
        FeatureIntroItem(
            imageName: "Explore/sos_card",
            accessibilityTitle: "SOS",
            aspectRatio: 130 / 166,
            action: .sos
        )
    ]

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

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

    private func setupUI() {
        backgroundColor = .white

        headerBackgroundView.contentMode = .scaleAspectFill
        headerBackgroundView.clipsToBounds = true
        addSubview(headerBackgroundView)
        headerBackgroundView.translatesAutoresizingMaskIntoConstraints = false

        titleLineView.backgroundColor = UIColor(hexStr: "#253B55")
        titleLineView.layer.cornerRadius = 1.5
        titleLineView.translatesAutoresizingMaskIntoConstraints = false

        titleLabel.text = "一键锁机"
        titleLabel.textColor = UIColor(hexStr: "#253B55")
        titleLabel.font = FontManager.ziHunBianHei(28)
        titleLabel.setContentCompressionResistancePriority(.required, for: .horizontal)

        titleContainer.axis = .horizontal
        titleContainer.alignment = .center
        titleContainer.spacing = 3
        titleContainer.addArrangedSubview(titleLineView)
        titleContainer.addArrangedSubview(titleLabel)
        addSubview(titleContainer)
        titleContainer.translatesAutoresizingMaskIntoConstraints = false

        sheetView.backgroundColor = .white
        sheetView.layer.cornerRadius = 30
        sheetView.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
        sheetView.clipsToBounds = true
        addSubview(sheetView)
        sheetView.translatesAutoresizingMaskIntoConstraints = false

        scrollView.alwaysBounceVertical = false
        scrollView.showsVerticalScrollIndicator = false
        scrollView.contentInset.bottom = 90
        sheetView.addSubview(scrollView)
        scrollView.translatesAutoresizingMaskIntoConstraints = false

        scrollView.addSubview(contentView)
        contentView.translatesAutoresizingMaskIntoConstraints = false

        gridStack.axis = .vertical
        gridStack.alignment = .fill
        gridStack.distribution = .fill
        gridStack.spacing = 13
        contentView.addSubview(gridStack)
        gridStack.translatesAutoresizingMaskIntoConstraints = false

        for rowIndex in 0..<3 {
            let rowStack = UIStackView()
            rowStack.axis = .horizontal
            rowStack.alignment = .fill
            rowStack.distribution = .fillEqually
            rowStack.spacing = 13

            for columnIndex in 0..<2 {
                let itemIndex = rowIndex * 2 + columnIndex
                let item = items[itemIndex]
                let card = FeatureIntroCardView(item: item)
                card.tag = itemIndex
                card.addTarget(self, action: #selector(cardTapped(_:)), for: .touchUpInside)
                rowStack.addArrangedSubview(card)
                card.heightAnchor.constraint(equalTo: card.widthAnchor, multiplier: item.aspectRatio).isActive = true
            }
            gridStack.addArrangedSubview(rowStack)
        }

        NSLayoutConstraint.activate([
            headerBackgroundView.topAnchor.constraint(equalTo: topAnchor),
            headerBackgroundView.leadingAnchor.constraint(equalTo: leadingAnchor),
            headerBackgroundView.trailingAnchor.constraint(equalTo: trailingAnchor),
            headerBackgroundView.heightAnchor.constraint(equalTo: widthAnchor, multiplier: 230 / 375),

            titleLineView.widthAnchor.constraint(equalToConstant: 24),
            titleLineView.heightAnchor.constraint(equalToConstant: 3),
            titleContainer.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 75),
            titleContainer.topAnchor.constraint(equalTo: topAnchor, constant: 91),

            sheetView.topAnchor.constraint(equalTo: topAnchor, constant: 200),
            sheetView.leadingAnchor.constraint(equalTo: leadingAnchor),
            sheetView.trailingAnchor.constraint(equalTo: trailingAnchor),
            sheetView.bottomAnchor.constraint(equalTo: bottomAnchor),

            scrollView.topAnchor.constraint(equalTo: sheetView.topAnchor),
            scrollView.leadingAnchor.constraint(equalTo: sheetView.leadingAnchor),
            scrollView.trailingAnchor.constraint(equalTo: sheetView.trailingAnchor),
            scrollView.bottomAnchor.constraint(equalTo: sheetView.bottomAnchor),

            contentView.topAnchor.constraint(equalTo: scrollView.contentLayoutGuide.topAnchor),
            contentView.leadingAnchor.constraint(equalTo: scrollView.contentLayoutGuide.leadingAnchor),
            contentView.trailingAnchor.constraint(equalTo: scrollView.contentLayoutGuide.trailingAnchor),
            contentView.bottomAnchor.constraint(equalTo: scrollView.contentLayoutGuide.bottomAnchor),
            contentView.widthAnchor.constraint(equalTo: scrollView.frameLayoutGuide.widthAnchor),

            gridStack.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 19),
            gridStack.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 15),
            gridStack.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -15),
            gridStack.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -20)
        ])
    }

    @objc private func cardTapped(_ sender: FeatureIntroCardView) {
        guard items.indices.contains(sender.tag) else { return }
        onTapItem?(items[sender.tag].action)
    }
}

final class FeatureIntroCardView: UIControl {

    private let imageView = UIImageView()

    init(item: FeatureIntroItem) {
        super.init(frame: .zero)

        isAccessibilityElement = true
        accessibilityLabel = item.accessibilityTitle
        accessibilityTraits = .button

        imageView.image = UIImage(named: item.imageName)
        imageView.contentMode = .scaleAspectFit
        imageView.isUserInteractionEnabled = false
        addSubview(imageView)
        imageView.translatesAutoresizingMaskIntoConstraints = false

        NSLayoutConstraint.activate([
            imageView.topAnchor.constraint(equalTo: topAnchor),
            imageView.leadingAnchor.constraint(equalTo: leadingAnchor),
            imageView.trailingAnchor.constraint(equalTo: trailingAnchor),
            imageView.bottomAnchor.constraint(equalTo: bottomAnchor)
        ])
    }

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

    override var isHighlighted: Bool {
        didSet {
            imageView.alpha = isHighlighted ? 0.78 : 1
        }
    }
}