import UIKit
import Combine

final class AvatarCellButton: UIControl {
    let titleLabel = UILabel()
    let imageView = UIImageView()

    init() {
        super.init(frame: .zero)
        titleLabel.numberOfLines = 0
        titleLabel.textAlignment = .right
        titleLabel.font = Fonts.Mulish.semiBold.font(size: 13.0)

        addSubview(imageView)
        addSubview(titleLabel)

        imageView.snp.makeConstraints {
            $0.top.greaterThanOrEqualToSuperview()
            $0.left.equalToSuperview()
            $0.centerY.equalToSuperview()
            $0.bottom.lessThanOrEqualToSuperview()
        }

        titleLabel.snp.makeConstraints {
            $0.top.greaterThanOrEqualToSuperview()
            $0.left.equalTo(imageView.snp.right).offset(5)
            $0.centerY.equalToSuperview()
            $0.right.equalToSuperview()
            $0.width.equalTo(60)
            $0.bottom.lessThanOrEqualToSuperview()
        }
    }

    required init?(coder: NSCoder) { nil }
}

public final class AvatarCell: UITableViewCell {
    let h1Label = UILabel()
    let h2Label = UILabel()
    let h3Label = UILabel()
    let h4Label = UILabel()
    let separatorView = UIView()
    let avatarView = AvatarView()
    let stackView = UIStackView()
    let stateButton = AvatarCellButton()

    var cancellables = Set<AnyCancellable>()
    public var didTapStateButton: (() -> Void)!

    public override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)

        selectedBackgroundView = UIView()
        multipleSelectionBackgroundView = UIView()
        backgroundColor = Asset.neutralWhite.color

        h1Label.textColor = Asset.neutralActive.color
        h2Label.textColor = Asset.neutralSecondaryAlternative.color
        h3Label.textColor = Asset.neutralSecondaryAlternative.color
        h4Label.textColor = Asset.neutralSecondaryAlternative.color

        h1Label.font = Fonts.Mulish.semiBold.font(size: 14.0)
        h2Label.font = Fonts.Mulish.regular.font(size: 14.0)
        h3Label.font = Fonts.Mulish.regular.font(size: 14.0)
        h4Label.font = Fonts.Mulish.regular.font(size: 14.0)

        stackView.spacing = 4
        stackView.axis = .vertical
        
        stackView.addArrangedSubview(h1Label)
        stackView.addArrangedSubview(h2Label)
        stackView.addArrangedSubview(h3Label)
        stackView.addArrangedSubview(h4Label)

        separatorView.backgroundColor = Asset.neutralLine.color

        contentView.addSubview(stackView)
        contentView.addSubview(avatarView)
        contentView.addSubview(stateButton)
        contentView.addSubview(separatorView)

        setupConstraints()
    }

    required init?(coder: NSCoder) { nil }

    public override func prepareForReuse() {
        super.prepareForReuse()
        h1Label.text = nil
        h2Label.text = nil
        h3Label.text = nil
        h4Label.text = nil

        stateButton.imageView.image = nil
        stateButton.titleLabel.text = nil

        avatarView.prepareForReuse()
        cancellables.removeAll()
    }

    public func setup(
        title: String,
        image: Data?,
        firstSubtitle: String? = nil,
        secondSubtitle: String? = nil,
        thirdSubtitle: String? = nil,
        showSeparator: Bool = true
    ) {
        h1Label.text = title

        if let firstSubtitle = firstSubtitle {
            h2Label.isHidden = false
            h2Label.text = firstSubtitle
        } else {
            h2Label.isHidden = true
        }

        if let secondSubtitle = secondSubtitle {
            h3Label.isHidden = false
            h3Label.text = secondSubtitle
        } else {
            h3Label.isHidden = true
        }

        if let thirdSubtitle = thirdSubtitle {
            h4Label.isHidden = false
            h4Label.text = thirdSubtitle
        } else {
            h4Label.isHidden = true
        }

        avatarView.setupProfile(title: title, image: image, size: .medium)
        separatorView.alpha = showSeparator ? 1.0 : 0.0
    }

    public func setupForRequestSent(resent: Bool) {
        cancellables.removeAll()

        var buttonTitle: String? = nil
        var buttonImage: UIImage? = nil
        var buttonTitleColor: UIColor? = nil

        if resent {
            buttonTitle = Localized.Requests.Cell.resent
            buttonImage = Asset.requestsResent.image
            buttonTitleColor = Asset.neutralWeak.color
        } else {
            buttonTitle = Localized.Requests.Cell.requested
            buttonImage = Asset.requestsResend.image
            buttonTitleColor = Asset.brandPrimary.color
        }

        setupStateButton(
            image: buttonImage,
            title: buttonTitle,
            color: buttonTitleColor
        )
    }

    private func setupStateButton(
        image: UIImage?,
        title: String?,
        color: UIColor?
    ) {
        stateButton.imageView.image = image
        stateButton.titleLabel.text = title
        stateButton.titleLabel.textColor = color

        stateButton
            .publisher(for: .touchUpInside)
            .sink { [unowned self] in didTapStateButton() }
            .store(in: &cancellables)
    }

    private func setupConstraints() {
        avatarView.snp.makeConstraints {
            $0.width.height.equalTo(36)
            $0.left.equalToSuperview().offset(27)
            $0.centerY.equalToSuperview()
        }

        stackView.snp.makeConstraints {
            $0.top.equalTo(avatarView)
            $0.left.equalTo(avatarView.snp.right).offset(14)
            $0.right.lessThanOrEqualToSuperview().offset(-10)
            $0.bottom.greaterThanOrEqualTo(avatarView)
            $0.bottom.lessThanOrEqualToSuperview()
        }

        separatorView.snp.makeConstraints {
            $0.height.equalTo(1)
            $0.top.greaterThanOrEqualTo(stackView.snp.bottom).offset(10)
            $0.left.equalToSuperview().offset(25)
            $0.right.equalToSuperview()
            $0.bottom.equalToSuperview()
        }

        stateButton.snp.makeConstraints {
            $0.centerY.equalTo(stackView)
            $0.right.equalToSuperview().offset(-24)
        }
    }
}