smart_printer/smart_printer/ViewController.swift

//
//  ViewController.swift
//  smart_printer
//

import Cocoa

class ViewController: NSViewController {

    private var sidebar: SidebarView!
    private var homeContentView: NSView!
    private var scanContentView: NSView!
    private var scanAndHomeContentView: NSView!
    private var contentContainer: NSView!

    override func loadView() {
        let container = NSView(frame: NSRect(x: 0, y: 0, width: AppTheme.windowWidth, height: AppTheme.windowHeight))
        container.autoresizingMask = [.width, .height]
        container.wantsLayer = true
        container.layer?.backgroundColor = AppTheme.background.cgColor
        view = container
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        setupLayout()
    }

    private func setupLayout() {
        sidebar = SidebarView()

        let mainContent = NSView()
        mainContent.translatesAutoresizingMaskIntoConstraints = false
        mainContent.wantsLayer = true
        mainContent.layer?.backgroundColor = AppTheme.background.cgColor

        let header = makeHeader()

        contentContainer = NSView()
        contentContainer.translatesAutoresizingMaskIntoConstraints = false

        homeContentView = makeHomeContentView()
        scanContentView = makeScanContentView()
        scanAndHomeContentView = makeScanAndHomeContentView()

        contentContainer.addSubview(homeContentView)
        contentContainer.addSubview(scanContentView)
        contentContainer.addSubview(scanAndHomeContentView)

        let wavePattern = WavePatternView()
        wavePattern.translatesAutoresizingMaskIntoConstraints = false

        view.addSubview(sidebar)
        view.addSubview(mainContent)
        mainContent.addSubview(header)
        mainContent.addSubview(contentContainer)
        mainContent.addSubview(wavePattern)

        sidebar.onDestinationSelected = { [weak self] destination in
            self?.showDestination(destination)
        }

        NSLayoutConstraint.activate([
            sidebar.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            sidebar.topAnchor.constraint(equalTo: view.topAnchor),
            sidebar.bottomAnchor.constraint(equalTo: view.bottomAnchor),

            mainContent.leadingAnchor.constraint(equalTo: sidebar.trailingAnchor),
            mainContent.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            mainContent.topAnchor.constraint(equalTo: view.topAnchor),
            mainContent.bottomAnchor.constraint(equalTo: view.bottomAnchor),

            header.leadingAnchor.constraint(equalTo: mainContent.leadingAnchor),
            header.trailingAnchor.constraint(equalTo: mainContent.trailingAnchor),
            header.topAnchor.constraint(equalTo: mainContent.topAnchor, constant: 16),
            header.heightAnchor.constraint(equalToConstant: 44),

            contentContainer.leadingAnchor.constraint(equalTo: mainContent.leadingAnchor),
            contentContainer.trailingAnchor.constraint(equalTo: mainContent.trailingAnchor),
            contentContainer.topAnchor.constraint(equalTo: header.bottomAnchor, constant: 8),
            contentContainer.bottomAnchor.constraint(equalTo: mainContent.bottomAnchor),

            wavePattern.trailingAnchor.constraint(equalTo: mainContent.trailingAnchor),
            wavePattern.bottomAnchor.constraint(equalTo: mainContent.bottomAnchor),
            wavePattern.widthAnchor.constraint(equalToConstant: 200),
            wavePattern.heightAnchor.constraint(equalToConstant: 140),
        ])

        pinContentView(homeContentView)
        pinContentView(scanContentView)
        pinContentView(scanAndHomeContentView)
        showDestination(.home)
    }

    private func pinContentView(_ contentView: NSView) {
        NSLayoutConstraint.activate([
            contentView.leadingAnchor.constraint(equalTo: contentContainer.leadingAnchor),
            contentView.trailingAnchor.constraint(equalTo: contentContainer.trailingAnchor),
            contentView.topAnchor.constraint(equalTo: contentContainer.topAnchor),
            contentView.bottomAnchor.constraint(equalTo: contentContainer.bottomAnchor),
        ])
    }

    private func showDestination(_ destination: SidebarDestination) {
        homeContentView.isHidden = destination != .home
        scanContentView.isHidden = destination != .scan
        scanAndHomeContentView.isHidden = destination != .scanAndHome
    }

    private func makeHomeContentView() -> NSView {
        let container = NSView()
        container.translatesAutoresizingMaskIntoConstraints = false

        let scrollView = makeScrollView()
        container.addSubview(scrollView)

        NSLayoutConstraint.activate([
            scrollView.leadingAnchor.constraint(equalTo: container.leadingAnchor),
            scrollView.trailingAnchor.constraint(equalTo: container.trailingAnchor),
            scrollView.topAnchor.constraint(equalTo: container.topAnchor),
            scrollView.bottomAnchor.constraint(equalTo: container.bottomAnchor),
        ])

        return container
    }

    private func makeScanContentView() -> NSView {
        makeDestinationScrollView(
            title: "Scan",
            features: [
                FeatureCardData(title: "Scan File", subtitle: "Scan any document", iconKind: .scanFile),
                FeatureCardData(title: "OCR File", subtitle: "Scan and print text from images", iconKind: .ocrFile),
            ]
        )
    }

    private func makeScanAndHomeContentView() -> NSView {
        makeDestinationScrollView(
            title: "Premium",
            features: [
                FeatureCardData(title: "From Photos", subtitle: "Take a photo from gallery", iconKind: .scanFile),
                FeatureCardData(title: "Scan File", subtitle: "Scan any document", iconKind: .scanFile),
                FeatureCardData(title: "Print Text", subtitle: "Type text and print", iconKind: .printText),
                FeatureCardData(title: "Print Contacts", subtitle: "Print your contacts", iconKind: .printContacts),
            ]
        )
    }

    private func makeDestinationScrollView(title: String, features: [FeatureCardData]) -> NSView {
        let container = NSView()
        container.translatesAutoresizingMaskIntoConstraints = false
        container.isHidden = true

        let scrollView = NSScrollView()
        scrollView.translatesAutoresizingMaskIntoConstraints = false
        scrollView.hasVerticalScroller = true
        scrollView.hasHorizontalScroller = false
        scrollView.autohidesScrollers = true
        scrollView.drawsBackground = false
        scrollView.borderType = .noBorder

        let documentView = FlippedDocumentView()
        documentView.translatesAutoresizingMaskIntoConstraints = false

        let sectionTitle = makeSectionTitle(title, icon: .grid)
        let grid = makeFeatureRow(features: features)

        documentView.addSubview(sectionTitle)
        documentView.addSubview(grid)
        scrollView.documentView = documentView
        container.addSubview(scrollView)

        let contentGuide = scrollView.contentView

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

            documentView.topAnchor.constraint(equalTo: contentGuide.topAnchor),
            documentView.leadingAnchor.constraint(equalTo: contentGuide.leadingAnchor),
            documentView.trailingAnchor.constraint(equalTo: contentGuide.trailingAnchor),
            documentView.widthAnchor.constraint(equalTo: contentGuide.widthAnchor),

            sectionTitle.leadingAnchor.constraint(equalTo: documentView.leadingAnchor, constant: AppTheme.contentPadding),
            sectionTitle.trailingAnchor.constraint(equalTo: documentView.trailingAnchor, constant: -AppTheme.contentPadding),
            sectionTitle.topAnchor.constraint(equalTo: documentView.topAnchor, constant: 8),

            grid.leadingAnchor.constraint(equalTo: documentView.leadingAnchor, constant: AppTheme.contentPadding),
            grid.trailingAnchor.constraint(equalTo: documentView.trailingAnchor, constant: -AppTheme.contentPadding),
            grid.topAnchor.constraint(equalTo: sectionTitle.bottomAnchor, constant: 16),
            grid.bottomAnchor.constraint(equalTo: documentView.bottomAnchor, constant: -40),
        ])

        return container
    }

    private func makeHeader() -> NSView {
        let header = NSView()
        header.translatesAutoresizingMaskIntoConstraints = false

        let titleLabel = NSTextField(labelWithString: "Smart Printer")
        titleLabel.font = AppTheme.semiboldFont(size: 18)
        titleLabel.textColor = AppTheme.textPrimary
        titleLabel.alignment = .center
        titleLabel.translatesAutoresizingMaskIntoConstraints = false

        let settingsButton = NSButton()
        settingsButton.isBordered = false
        settingsButton.translatesAutoresizingMaskIntoConstraints = false
        if let image = NSImage(systemSymbolName: "gearshape", accessibilityDescription: "Settings") {
            let config = NSImage.SymbolConfiguration(pointSize: 18, weight: .regular)
            settingsButton.image = image.withSymbolConfiguration(config)
        }
        settingsButton.contentTintColor = AppTheme.textSecondary

        header.addSubview(titleLabel)
        header.addSubview(settingsButton)

        NSLayoutConstraint.activate([
            titleLabel.centerXAnchor.constraint(equalTo: header.centerXAnchor),
            titleLabel.centerYAnchor.constraint(equalTo: header.centerYAnchor),

            settingsButton.trailingAnchor.constraint(equalTo: header.trailingAnchor, constant: -28),
            settingsButton.centerYAnchor.constraint(equalTo: header.centerYAnchor),
            settingsButton.widthAnchor.constraint(equalToConstant: 32),
            settingsButton.heightAnchor.constraint(equalToConstant: 32),
        ])

        return header
    }

    private func makeScrollView() -> NSScrollView {
        let scrollView = NSScrollView()
        scrollView.translatesAutoresizingMaskIntoConstraints = false
        scrollView.hasVerticalScroller = true
        scrollView.hasHorizontalScroller = false
        scrollView.autohidesScrollers = true
        scrollView.drawsBackground = false
        scrollView.borderType = .noBorder

        let documentView = FlippedDocumentView()
        documentView.translatesAutoresizingMaskIntoConstraints = false

        let quickStartSection = makeQuickStartSection()
        let createPrintSection = makeCreatePrintSection()

        documentView.addSubview(quickStartSection)
        documentView.addSubview(createPrintSection)
        scrollView.documentView = documentView

        let contentGuide = scrollView.contentView

        NSLayoutConstraint.activate([
            documentView.topAnchor.constraint(equalTo: contentGuide.topAnchor),
            documentView.leadingAnchor.constraint(equalTo: contentGuide.leadingAnchor),
            documentView.trailingAnchor.constraint(equalTo: contentGuide.trailingAnchor),
            documentView.widthAnchor.constraint(equalTo: contentGuide.widthAnchor),

            quickStartSection.leadingAnchor.constraint(equalTo: documentView.leadingAnchor, constant: AppTheme.contentPadding),
            quickStartSection.trailingAnchor.constraint(equalTo: documentView.trailingAnchor, constant: -AppTheme.contentPadding),
            quickStartSection.topAnchor.constraint(equalTo: documentView.topAnchor, constant: 8),

            createPrintSection.leadingAnchor.constraint(equalTo: documentView.leadingAnchor, constant: AppTheme.contentPadding),
            createPrintSection.trailingAnchor.constraint(equalTo: documentView.trailingAnchor, constant: -AppTheme.contentPadding),
            createPrintSection.topAnchor.constraint(equalTo: quickStartSection.bottomAnchor, constant: 36),
            createPrintSection.bottomAnchor.constraint(equalTo: documentView.bottomAnchor, constant: -40),
        ])

        return scrollView
    }

    private enum SectionTitleIcon {
        case none
        case sparkle
        case grid
    }

    private func makeSectionTitle(_ text: String, icon: SectionTitleIcon = .none) -> NSView {
        let container = NSView()
        container.translatesAutoresizingMaskIntoConstraints = false

        var leadingAnchor = container.leadingAnchor
        var iconSpacing: CGFloat = 0

        if icon != .none {
            let titleIcon: NSView
            switch icon {
            case .sparkle:
                titleIcon = SparkleIconView()
            case .grid:
                let gridIcon = NSImageView()
                if let image = NSImage(systemSymbolName: "square.grid.2x2", accessibilityDescription: nil) {
                    let config = NSImage.SymbolConfiguration(pointSize: 16, weight: .medium)
                    gridIcon.image = image.withSymbolConfiguration(config)
                }
                gridIcon.contentTintColor = AppTheme.textPrimary
                titleIcon = gridIcon
            case .none:
                titleIcon = NSView()
            }

            titleIcon.translatesAutoresizingMaskIntoConstraints = false
            container.addSubview(titleIcon)

            NSLayoutConstraint.activate([
                titleIcon.leadingAnchor.constraint(equalTo: container.leadingAnchor),
                titleIcon.centerYAnchor.constraint(equalTo: container.centerYAnchor),
                titleIcon.widthAnchor.constraint(equalToConstant: 24),
                titleIcon.heightAnchor.constraint(equalToConstant: 24),
            ])
            leadingAnchor = titleIcon.trailingAnchor
            iconSpacing = 8
        }

        let label = NSTextField(labelWithString: text)
        label.font = .systemFont(ofSize: 20, weight: .bold)
        label.textColor = AppTheme.textPrimary
        label.translatesAutoresizingMaskIntoConstraints = false
        container.addSubview(label)

        NSLayoutConstraint.activate([
            container.heightAnchor.constraint(equalToConstant: 28),
            label.leadingAnchor.constraint(equalTo: leadingAnchor, constant: iconSpacing),
            label.centerYAnchor.constraint(equalTo: container.centerYAnchor),
            label.trailingAnchor.constraint(equalTo: container.trailingAnchor),
        ])

        return container
    }

    private func makeQuickStartSection() -> NSView {
        let section = NSView()
        section.translatesAutoresizingMaskIntoConstraints = false

        let title = makeSectionTitle("Quick Start", icon: .sparkle)
        section.addSubview(title)

        let cardsStack = NSStackView()
        cardsStack.orientation = .horizontal
        cardsStack.spacing = AppTheme.quickStartSpacing
        cardsStack.distribution = .fillEqually
        cardsStack.translatesAutoresizingMaskIntoConstraints = false

        let cards: [QuickStartCardData] = [
            QuickStartCardData(
                title: "From Photos",
                subtitle: "Take a photo from gallery",
                buttonTitle: "Open Gallery",
                accentColor: AppTheme.blue,
                gradientColors: [AppTheme.blueLight, NSColor(red: 0.82, green: 0.90, blue: 1.0, alpha: 1)],
                iconKind: .photos
            ),
            QuickStartCardData(
                title: "From Files",
                subtitle: "Take a photo from file manager",
                buttonTitle: "Browse Files",
                accentColor: AppTheme.green,
                gradientColors: [AppTheme.greenLight, NSColor(red: 0.78, green: 0.94, blue: 0.84, alpha: 1)],
                iconKind: .files
            ),
            QuickStartCardData(
                title: "Import File",
                subtitle: "Import a file from storage",
                buttonTitle: "Import Now",
                accentColor: AppTheme.orange,
                gradientColors: [AppTheme.orangeLight, NSColor(red: 1.0, green: 0.88, blue: 0.76, alpha: 1)],
                iconKind: .importFile
            ),
        ]

        for cardData in cards {
            cardsStack.addArrangedSubview(QuickStartCardView(data: cardData))
        }

        section.addSubview(cardsStack)

        NSLayoutConstraint.activate([
            title.leadingAnchor.constraint(equalTo: section.leadingAnchor),
            title.topAnchor.constraint(equalTo: section.topAnchor),

            cardsStack.leadingAnchor.constraint(equalTo: section.leadingAnchor),
            cardsStack.trailingAnchor.constraint(equalTo: section.trailingAnchor),
            cardsStack.topAnchor.constraint(equalTo: title.bottomAnchor, constant: 16),
            cardsStack.bottomAnchor.constraint(equalTo: section.bottomAnchor),
        ])

        return section
    }

    private func makeCreatePrintSection() -> NSView {
        let section = NSView()
        section.translatesAutoresizingMaskIntoConstraints = false

        let title = makeSectionTitle("Create & Print", icon: .grid)
        section.addSubview(title)

        let features: [FeatureCardData] = [
            FeatureCardData(title: "Scan File", subtitle: "Scan any document", iconKind: .scanFile),
            FeatureCardData(title: "Print Text", subtitle: "Type text and print", iconKind: .printText),
            FeatureCardData(title: "Print Contacts", subtitle: "Print your contacts", iconKind: .printContacts),
            FeatureCardData(title: "Print Website", subtitle: "Print any website", iconKind: .printWebsite),
            FeatureCardData(title: "Draw & Print", subtitle: "Add drawings, text and more", iconKind: .drawPrint),
            FeatureCardData(title: "OCR File", subtitle: "Scan and print text from images", iconKind: .ocrFile),
        ]

        let topRow = makeFeatureRow(features: Array(features.prefix(4)))
        let bottomRow = makeFeatureRow(features: Array(features.suffix(2)))

        let grid = NSStackView(views: [topRow, bottomRow])
        grid.orientation = .vertical
        grid.spacing = AppTheme.featureGridSpacing
        grid.distribution = .fillEqually
        grid.translatesAutoresizingMaskIntoConstraints = false

        section.addSubview(grid)

        NSLayoutConstraint.activate([
            title.leadingAnchor.constraint(equalTo: section.leadingAnchor),
            title.topAnchor.constraint(equalTo: section.topAnchor),

            grid.leadingAnchor.constraint(equalTo: section.leadingAnchor),
            grid.trailingAnchor.constraint(equalTo: section.trailingAnchor),
            grid.topAnchor.constraint(equalTo: title.bottomAnchor, constant: 16),
            grid.bottomAnchor.constraint(equalTo: section.bottomAnchor),
        ])

        return section
    }

    private func makeFeatureRow(features: [FeatureCardData]) -> NSStackView {
        let row = NSStackView()
        row.orientation = .horizontal
        row.spacing = AppTheme.featureGridSpacing
        row.distribution = .fillEqually
        row.translatesAutoresizingMaskIntoConstraints = false

        for data in features {
            row.addArrangedSubview(FeatureCardView(data: data))
        }

        return row
    }
}

private final class FlippedDocumentView: NSView {
    override var isFlipped: Bool { true }
}