//
//  ConsentContentView.swift
//  MullvadVPN
//
//  Created by pronebird on 28/04/2021.
//  Copyright © 2021 Mullvad VPN AB. All rights reserved.
//

import UIKit

class ConsentContentView: UIView {

    let titleLabel: UILabel = {
        let titleLabel = UILabel()
        titleLabel.translatesAutoresizingMaskIntoConstraints = false
        titleLabel.font = UIFont.systemFont(ofSize: 24, weight: .bold)
        titleLabel.numberOfLines = 0
        titleLabel.textColor = .white
        titleLabel.allowsDefaultTighteningForTruncation = true
        titleLabel.text = NSLocalizedString("PRIVACY_NOTICE_HEADING", tableName: "Consent", comment: "Heading.")
        titleLabel.lineBreakMode = .byWordWrapping
        if #available(iOS 14.0, *) {
            // Disable the new line break strategy used by UIKit that moves at least two words
            // to the next line which makes the title look odd.
            // See: https://stackoverflow.com/q/46200027/351305
            titleLabel.lineBreakStrategy = []
        }
        return titleLabel
    }()

    let bodyLabel: UILabel = {
        let bodyLabel = UILabel()
        bodyLabel.translatesAutoresizingMaskIntoConstraints = false
        bodyLabel.font = UIFont.systemFont(ofSize: 18)
        bodyLabel.textColor = .white
        bodyLabel.numberOfLines = 0
        bodyLabel.text = NSLocalizedString("PRIVACY_NOTICE_BODY", tableName: "Consent", comment: "Body.")
        return bodyLabel
    }()

    let privacyPolicyLink: LinkButton = {
        let button = LinkButton()
        button.translatesAutoresizingMaskIntoConstraints = false
        button.titleString = NSLocalizedString(
            "PRIVACY_POLICY_LINK_TITLE",
            tableName: "Consent",
            comment: "Title for link to privacy policy web page."
        )
        button.setImage(UIImage(named: "IconExtlink"), for: .normal)
        return button
    }()

    let agreeButton: AppButton = {
        let button = AppButton(style: .default)
        button.translatesAutoresizingMaskIntoConstraints = false
        button.accessibilityIdentifier = "AgreeButton"
        button.setTitle(NSLocalizedString(
            "CONTINUE_BUTTON_TITLE",
            tableName: "Consent",
            comment: "Title for button used for agreeing with privacy notice."
        ), for: .normal)
        return button
    }()

    let scrollView: UIScrollView = {
        let scrollView = UIScrollView()
        scrollView.translatesAutoresizingMaskIntoConstraints = false
        return scrollView
    }()

    let scrollContentContainer: UIView = {
        let contentView = UIView()
        contentView.translatesAutoresizingMaskIntoConstraints = false
        contentView.layoutMargins = UIMetrics.contentLayoutMargins
        return contentView
    }()

    let footerContainer: UIView = {
        let container = UIView()
        container.translatesAutoresizingMaskIntoConstraints = false
        container.layoutMargins = UIMetrics.contentLayoutMargins
        container.backgroundColor = .secondaryColor
        return container
    }()

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

        addSubviews()
    }

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

    // MARK: - Private

    private func addSubviews() {
        addSubview(scrollView)
        addSubview(footerContainer)

        scrollView.addSubview(scrollContentContainer)
        [titleLabel, bodyLabel, privacyPolicyLink].forEach { scrollContentContainer.addSubview($0) }
        footerContainer.addSubview(agreeButton)

        scrollView.setContentCompressionResistancePriority(.defaultLow, for: .vertical)
        footerContainer.setContentCompressionResistancePriority(.defaultHigh, for: .vertical)

        NSLayoutConstraint.activate([
            scrollView.topAnchor.constraint(equalTo: safeAreaLayoutGuide.topAnchor),
            scrollView.leadingAnchor.constraint(equalTo: leadingAnchor),
            scrollView.trailingAnchor.constraint(equalTo: trailingAnchor),

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

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

            agreeButton.topAnchor.constraint(equalTo: footerContainer.layoutMarginsGuide.topAnchor),
            agreeButton.leadingAnchor.constraint(equalTo: footerContainer.layoutMarginsGuide.leadingAnchor),
            agreeButton.trailingAnchor.constraint(equalTo: footerContainer.layoutMarginsGuide.trailingAnchor),
            agreeButton.bottomAnchor.constraint(equalTo: footerContainer.layoutMarginsGuide.bottomAnchor),

            titleLabel.topAnchor.constraint(equalTo: scrollContentContainer.layoutMarginsGuide.topAnchor),
            titleLabel.leadingAnchor.constraint(equalTo: scrollContentContainer.layoutMarginsGuide.leadingAnchor),
            titleLabel.trailingAnchor.constraint(equalTo: scrollContentContainer.layoutMarginsGuide.trailingAnchor),

            bodyLabel.topAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: 24),
            bodyLabel.leadingAnchor.constraint(equalTo: scrollContentContainer.layoutMarginsGuide.leadingAnchor),
            bodyLabel.trailingAnchor.constraint(equalTo: scrollContentContainer.layoutMarginsGuide.trailingAnchor),

            privacyPolicyLink.topAnchor.constraint(equalTo: bodyLabel.bottomAnchor, constant: 24),
            privacyPolicyLink.leadingAnchor.constraint(equalTo: scrollContentContainer.layoutMarginsGuide.leadingAnchor),
            privacyPolicyLink.trailingAnchor.constraint(lessThanOrEqualTo: scrollContentContainer.layoutMarginsGuide.trailingAnchor),
            privacyPolicyLink.bottomAnchor.constraint(equalTo: scrollContentContainer.layoutMarginsGuide.bottomAnchor),

        ])
    }

}