import UIKit

@MainActor
enum ToolTimelineRowLayoutBuilder {
    struct Constraints {
        let toolLeading: NSLayoutConstraint
        let toolWidth: NSLayoutConstraint
        let titleLeadingToStatus: NSLayoutConstraint
        let titleLeadingToTool: NSLayoutConstraint
        let expandedLabelWidth: NSLayoutConstraint
        let expandedLabelHeightLock: NSLayoutConstraint
        let expandedMarkdownWidth: NSLayoutConstraint
        let expandedReadMediaWidth: NSLayoutConstraint
        let imagePreviewHeight: NSLayoutConstraint
        let expandedViewportHeight: NSLayoutConstraint
        let all: [NSLayoutConstraint]
    }

    static func makeLanguageBadgeConstraints(
        languageBadgeIconView: UIImageView
    ) -> [NSLayoutConstraint] {
        [
            languageBadgeIconView.widthAnchor.constraint(equalToConstant: 14),
            languageBadgeIconView.heightAnchor.constraint(equalToConstant: 14),
        ]
    }

    static func makeConstraints(
        containerView: UIView,
        borderView: UIView,
        statusImageView: UIImageView,
        toolImageView: UIImageView,
        titleLabel: UILabel,
        trailingStack: UIStackView,
        bodyStack: UIStackView,
        expandedContainer: UIView,
        expandedScrollView: UIScrollView,
        expandedSurfaceHostView: UIView,
        expandedLabel: UITextView,
        expandedMarkdownView: UIView,
        expandedReadMediaContainer: UIView,
        imagePreviewContainer: UIView,
        imagePreviewImageView: UIImageView,
        minDiffViewportHeight: CGFloat,
        collapsedImagePreviewHeight: CGFloat
    ) -> Constraints {
        let toolLeading = toolImageView.leadingAnchor.constraint(equalTo: statusImageView.trailingAnchor, constant: 0)
        let toolWidth = toolImageView.widthAnchor.constraint(equalToConstant: 0)
        let titleLeadingToStatus = titleLabel.leadingAnchor.constraint(equalTo: statusImageView.trailingAnchor, constant: 5)
        let titleLeadingToTool = titleLabel.leadingAnchor.constraint(equalTo: toolImageView.trailingAnchor, constant: 5)

        let expandedLabelWidth = expandedLabel.widthAnchor.constraint(
            equalTo: expandedScrollView.frameLayoutGuide.widthAnchor,
            constant: -12
        )
        let expandedLabelHeightLock = expandedLabel.heightAnchor.constraint(
            equalTo: expandedScrollView.frameLayoutGuide.heightAnchor,
            constant: -10
        )
        let expandedMarkdownWidth = expandedMarkdownView.widthAnchor.constraint(
            equalTo: expandedScrollView.frameLayoutGuide.widthAnchor,
            constant: -12
        )
        let expandedReadMediaWidth = expandedReadMediaContainer.widthAnchor.constraint(
            equalTo: expandedScrollView.frameLayoutGuide.widthAnchor,
            constant: 0
        )
        let imagePreviewHeight = imagePreviewContainer.heightAnchor.constraint(
            equalToConstant: collapsedImagePreviewHeight
        )

        let expandedViewportHeight = expandedContainer.heightAnchor.constraint(equalToConstant: minDiffViewportHeight)
        // Self-sizing collection cells can temporarily hand the content view a
        // stale/taller frame while UIKit settles estimated heights. Keep the
        // viewport height soft so read-media fallback labels do not stretch into
        // giant blank cards while the next sizing pass catches up.
        expandedViewportHeight.priority = .defaultHigh

        let all: [NSLayoutConstraint] = [
            borderView.leadingAnchor.constraint(equalTo: containerView.leadingAnchor),
            borderView.trailingAnchor.constraint(equalTo: containerView.trailingAnchor),
            borderView.topAnchor.constraint(equalTo: containerView.topAnchor),
            borderView.bottomAnchor.constraint(equalTo: containerView.bottomAnchor),

            statusImageView.leadingAnchor.constraint(equalTo: borderView.leadingAnchor, constant: 8),
            statusImageView.topAnchor.constraint(equalTo: borderView.topAnchor, constant: 6),
            statusImageView.widthAnchor.constraint(equalToConstant: 14),
            statusImageView.heightAnchor.constraint(equalToConstant: 14),

            toolLeading,
            toolImageView.centerYAnchor.constraint(equalTo: statusImageView.centerYAnchor),
            toolWidth,
            toolImageView.heightAnchor.constraint(equalToConstant: 12),

            titleLeadingToStatus,
            titleLabel.topAnchor.constraint(equalTo: borderView.topAnchor, constant: 6),

            trailingStack.leadingAnchor.constraint(greaterThanOrEqualTo: titleLabel.trailingAnchor, constant: 6),
            trailingStack.centerYAnchor.constraint(equalTo: statusImageView.centerYAnchor),
            trailingStack.trailingAnchor.constraint(equalTo: borderView.trailingAnchor, constant: -8),

            bodyStack.leadingAnchor.constraint(equalTo: borderView.leadingAnchor, constant: 8),
            bodyStack.trailingAnchor.constraint(equalTo: borderView.trailingAnchor, constant: -8),
            bodyStack.topAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: 4),
            bodyStack.bottomAnchor.constraint(equalTo: borderView.bottomAnchor, constant: -6),

            expandedScrollView.leadingAnchor.constraint(equalTo: expandedContainer.leadingAnchor),
            expandedScrollView.trailingAnchor.constraint(equalTo: expandedContainer.trailingAnchor),
            expandedScrollView.topAnchor.constraint(equalTo: expandedContainer.topAnchor),
            expandedScrollView.bottomAnchor.constraint(equalTo: expandedContainer.bottomAnchor),

            expandedSurfaceHostView.leadingAnchor.constraint(equalTo: expandedScrollView.contentLayoutGuide.leadingAnchor),
            expandedSurfaceHostView.trailingAnchor.constraint(equalTo: expandedScrollView.contentLayoutGuide.trailingAnchor),
            expandedSurfaceHostView.topAnchor.constraint(equalTo: expandedScrollView.contentLayoutGuide.topAnchor),
            expandedSurfaceHostView.bottomAnchor.constraint(equalTo: expandedScrollView.contentLayoutGuide.bottomAnchor),

            expandedLabelWidth,
            expandedMarkdownWidth,
            expandedReadMediaWidth,

            imagePreviewImageView.leadingAnchor.constraint(equalTo: imagePreviewContainer.leadingAnchor, constant: 6),
            imagePreviewImageView.trailingAnchor.constraint(equalTo: imagePreviewContainer.trailingAnchor, constant: -6),
            imagePreviewImageView.topAnchor.constraint(equalTo: imagePreviewContainer.topAnchor, constant: 6),
            imagePreviewImageView.bottomAnchor.constraint(equalTo: imagePreviewContainer.bottomAnchor, constant: -6),
            imagePreviewHeight,
        ]

        return Constraints(
            toolLeading: toolLeading,
            toolWidth: toolWidth,
            titleLeadingToStatus: titleLeadingToStatus,
            titleLeadingToTool: titleLeadingToTool,
            expandedLabelWidth: expandedLabelWidth,
            expandedLabelHeightLock: expandedLabelHeightLock,
            expandedMarkdownWidth: expandedMarkdownWidth,
            expandedReadMediaWidth: expandedReadMediaWidth,
            imagePreviewHeight: imagePreviewHeight,
            expandedViewportHeight: expandedViewportHeight,
            all: all
        )
    }
}