//
//  DashboardView.swift
//  App for Indeed
//

import Cocoa

final class DashboardView: NSView {
    private let contentStack = NSStackView()
    private let documentContainer = NSView()
    private let chromeContainer = NSView()
    private let sidebar = NSStackView()
    private let mainColumn = NSStackView()
    private let greetingLabel = NSTextField(labelWithString: "")
    private let subtitleLabel = NSTextField(labelWithString: "Find your perfect job with the power of AI.")
    private let heroCard = NSView()
    private let statGrid = NSGridView(views: [[]])
    private let recommendationsStack = NSStackView()
    private let insightsStack = NSStackView()
    private let scrollView = NSScrollView()
    private var recommendationsWidthConstraint: NSLayoutConstraint?
    private var insightsWidthConstraint: NSLayoutConstraint?

    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        setupLayout()
    }

    required init?(coder: NSCoder) {
        super.init(coder: coder)
        setupLayout()
    }

    override func layout() {
        super.layout()
        updateDocumentLayout()
    }

    func render(_ data: DashboardData) {
        greetingLabel.stringValue = "Welcome back, \(data.greetingName)! 👋"
        configureSidebar(data.sidebarItems)
        configureStats(data.stats)
        configureRecommendations(data.recommendations)
        configureInsights(data.insights)
        updateDocumentLayout()
    }

    private func setupLayout() {
        wantsLayer = true
        layer?.backgroundColor = NSColor(calibratedRed: 0.03, green: 0.06, blue: 0.14, alpha: 1).cgColor

        scrollView.translatesAutoresizingMaskIntoConstraints = false
        scrollView.hasVerticalScroller = true
        scrollView.drawsBackground = false
        addSubview(scrollView)

        contentStack.orientation = .horizontal
        contentStack.spacing = 20
        contentStack.translatesAutoresizingMaskIntoConstraints = false
        contentStack.alignment = .top
        contentStack.edgeInsets = NSEdgeInsets(top: 24, left: 24, bottom: 24, right: 24)

        documentContainer.translatesAutoresizingMaskIntoConstraints = true
        documentContainer.autoresizingMask = [.width]
        documentContainer.frame = NSRect(x: 0, y: 0, width: 1040, height: 900)
        chromeContainer.translatesAutoresizingMaskIntoConstraints = false
        chromeContainer.wantsLayer = true
        chromeContainer.layer?.backgroundColor = NSColor(calibratedRed: 0.03, green: 0.08, blue: 0.2, alpha: 1).cgColor
        chromeContainer.layer?.cornerRadius = 18
        documentContainer.addSubview(chromeContainer)
        chromeContainer.addSubview(contentStack)
        scrollView.documentView = documentContainer

        sidebar.orientation = .vertical
        sidebar.spacing = 10
        sidebar.alignment = .leading
        sidebar.wantsLayer = true
        sidebar.layer?.backgroundColor = NSColor(calibratedRed: 0.06, green: 0.09, blue: 0.2, alpha: 1).cgColor
        sidebar.layer?.cornerRadius = 16
        sidebar.edgeInsets = NSEdgeInsets(top: 18, left: 14, bottom: 18, right: 14)
        sidebar.translatesAutoresizingMaskIntoConstraints = false

        mainColumn.orientation = .vertical
        mainColumn.spacing = 14
        mainColumn.alignment = .leading
        mainColumn.translatesAutoresizingMaskIntoConstraints = false

        greetingLabel.font = .systemFont(ofSize: 30, weight: .bold)
        greetingLabel.textColor = .white
        subtitleLabel.font = .systemFont(ofSize: 14, weight: .regular)
        subtitleLabel.textColor = NSColor.white.withAlphaComponent(0.75)

        heroCard.wantsLayer = true
        heroCard.layer?.backgroundColor = NSColor(calibratedRed: 0.08, green: 0.11, blue: 0.28, alpha: 1).cgColor
        heroCard.layer?.cornerRadius = 18
        heroCard.translatesAutoresizingMaskIntoConstraints = false
        let hero = buildHeroContent()
        heroCard.addSubview(hero)

        statGrid.translatesAutoresizingMaskIntoConstraints = false
        statGrid.rowSpacing = 10
        statGrid.columnSpacing = 10

        let lowerSection = NSStackView()
        lowerSection.orientation = .horizontal
        lowerSection.spacing = 12
        lowerSection.alignment = .top
        lowerSection.distribution = .fill
        lowerSection.translatesAutoresizingMaskIntoConstraints = false

        let recommendationsBox = sectionBox(title: "Recommended for You", content: recommendationsStack)
        let insightsBox = sectionBox(title: "AI Insights", content: insightsStack)
        recommendationsBox.translatesAutoresizingMaskIntoConstraints = false
        insightsBox.translatesAutoresizingMaskIntoConstraints = false

        lowerSection.addArrangedSubview(recommendationsBox)
        lowerSection.addArrangedSubview(insightsBox)

        mainColumn.addArrangedSubview(greetingLabel)
        mainColumn.addArrangedSubview(subtitleLabel)
        mainColumn.addArrangedSubview(heroCard)
        mainColumn.addArrangedSubview(statGrid)
        mainColumn.addArrangedSubview(lowerSection)

        contentStack.addArrangedSubview(sidebar)
        contentStack.addArrangedSubview(mainColumn)

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

            chromeContainer.topAnchor.constraint(equalTo: documentContainer.topAnchor, constant: 18),
            chromeContainer.bottomAnchor.constraint(equalTo: documentContainer.bottomAnchor, constant: -18),
            chromeContainer.centerXAnchor.constraint(equalTo: documentContainer.centerXAnchor),
            chromeContainer.widthAnchor.constraint(lessThanOrEqualToConstant: 1240),
            chromeContainer.widthAnchor.constraint(equalTo: documentContainer.widthAnchor, constant: -36),

            contentStack.leadingAnchor.constraint(equalTo: chromeContainer.leadingAnchor),
            contentStack.trailingAnchor.constraint(equalTo: chromeContainer.trailingAnchor),
            contentStack.topAnchor.constraint(equalTo: chromeContainer.topAnchor),
            contentStack.bottomAnchor.constraint(equalTo: chromeContainer.bottomAnchor),

            sidebar.widthAnchor.constraint(equalToConstant: 225),
            mainColumn.widthAnchor.constraint(greaterThanOrEqualToConstant: 720),
            heroCard.widthAnchor.constraint(equalTo: mainColumn.widthAnchor),
            heroCard.heightAnchor.constraint(equalToConstant: 140),

            hero.leadingAnchor.constraint(equalTo: heroCard.leadingAnchor, constant: 22),
            hero.trailingAnchor.constraint(equalTo: heroCard.trailingAnchor, constant: -22),
            hero.topAnchor.constraint(equalTo: heroCard.topAnchor, constant: 18),
            hero.bottomAnchor.constraint(equalTo: heroCard.bottomAnchor, constant: -18),

            lowerSection.widthAnchor.constraint(equalTo: mainColumn.widthAnchor)
        ])

        recommendationsWidthConstraint = recommendationsBox.widthAnchor.constraint(equalTo: mainColumn.widthAnchor, multiplier: 0.68)
        insightsWidthConstraint = insightsBox.widthAnchor.constraint(equalTo: mainColumn.widthAnchor, multiplier: 0.32, constant: -8)
        recommendationsWidthConstraint?.isActive = true
        insightsWidthConstraint?.isActive = true
    }

    private func buildHeroContent() -> NSView {
        let container = NSStackView()
        container.orientation = .horizontal
        container.translatesAutoresizingMaskIntoConstraints = false
        container.distribution = .fillEqually

        let left = NSStackView()
        left.orientation = .vertical
        left.spacing = 8
        left.alignment = .leading

        let title = NSTextField(labelWithString: "AI Job Search Assistant")
        title.font = .systemFont(ofSize: 24, weight: .semibold)
        title.textColor = .white

        let body = NSTextField(labelWithString: "Let AI find the best jobs for you on Indeed based on your preferences.")
        body.font = .systemFont(ofSize: 12, weight: .regular)
        body.textColor = NSColor.white.withAlphaComponent(0.72)

        let action = NSButton(title: "Find Jobs with AI", target: nil, action: nil)
        action.bezelStyle = .rounded
        action.wantsLayer = true
        action.layer?.backgroundColor = NSColor(calibratedRed: 0.27, green: 0.42, blue: 1.0, alpha: 1).cgColor
        action.layer?.cornerRadius = 8
        action.contentTintColor = .white
        action.font = .systemFont(ofSize: 13, weight: .semibold)

        left.addArrangedSubview(title)
        left.addArrangedSubview(body)
        left.addArrangedSubview(action)

        let right = NSStackView()
        right.orientation = .vertical
        right.alignment = .trailing
        right.addArrangedSubview(tagBubble("Quick"))
        right.addArrangedSubview(tagBubble("Smart"))
        right.addArrangedSubview(tagBubble("Personalized"))

        container.addArrangedSubview(left)
        container.addArrangedSubview(right)
        return container
    }

    private func configureSidebar(_ items: [SidebarItem]) {
        sidebar.arrangedSubviews.forEach {
            sidebar.removeArrangedSubview($0)
            $0.removeFromSuperview()
        }

        let brand = NSTextField(labelWithString: "Indeed AI\nJob Finder")
        brand.font = .systemFont(ofSize: 18, weight: .bold)
        brand.textColor = .white
        sidebar.addArrangedSubview(brand)

        let spacer = NSView()
        spacer.translatesAutoresizingMaskIntoConstraints = false
        spacer.heightAnchor.constraint(equalToConstant: 8).isActive = true
        sidebar.addArrangedSubview(spacer)

        items.enumerated().forEach { index, item in
            let row = NSStackView()
            row.orientation = .horizontal
            row.spacing = 8
            row.alignment = .centerY
            row.wantsLayer = true
            row.layer?.cornerRadius = 8
            row.edgeInsets = NSEdgeInsets(top: 8, left: 10, bottom: 8, right: 10)
            if index == 0 {
                row.layer?.backgroundColor = NSColor(calibratedRed: 0.22, green: 0.31, blue: 0.85, alpha: 0.4).cgColor
            }

            let icon = NSImageView()
            icon.symbolConfiguration = NSImage.SymbolConfiguration(pointSize: 13, weight: .medium)
            icon.image = NSImage(systemSymbolName: item.systemImage, accessibilityDescription: item.title)
            icon.contentTintColor = .white

            let text = NSTextField(labelWithString: item.title)
            text.font = .systemFont(ofSize: 14, weight: .medium)
            text.textColor = .white

            row.addArrangedSubview(icon)
            row.addArrangedSubview(text)

            if let badge = item.badge {
                let badgeField = NSTextField(labelWithString: badge)
                badgeField.font = .systemFont(ofSize: 11, weight: .semibold)
                badgeField.textColor = .white
                badgeField.wantsLayer = true
                badgeField.layer?.backgroundColor = NSColor.systemPurple.cgColor
                badgeField.layer?.cornerRadius = 8
                badgeField.alignment = .center
                badgeField.maximumNumberOfLines = 1
                badgeField.lineBreakMode = .byClipping
                badgeField.translatesAutoresizingMaskIntoConstraints = false
                badgeField.widthAnchor.constraint(equalToConstant: 42).isActive = true
                row.addArrangedSubview(NSView())
                row.addArrangedSubview(badgeField)
            }
            sidebar.addArrangedSubview(row)
        }
    }

    private func configureStats(_ stats: [StatCard]) {
        statGrid.removeRow(at: 0)
        let cards = stats.map { stat -> NSView in
            let card = NSStackView()
            card.orientation = .vertical
            card.spacing = 6
            card.edgeInsets = NSEdgeInsets(top: 14, left: 14, bottom: 14, right: 14)
            card.wantsLayer = true
            card.layer?.backgroundColor = NSColor(calibratedRed: 0.06, green: 0.11, blue: 0.24, alpha: 1).cgColor
            card.layer?.cornerRadius = 14

            let value = NSTextField(labelWithString: stat.value)
            value.font = .systemFont(ofSize: 30, weight: .bold)
            value.textColor = .white

            let title = NSTextField(labelWithString: stat.title)
            title.font = .systemFont(ofSize: 13, weight: .medium)
            title.textColor = NSColor.white.withAlphaComponent(0.74)

            let trend = NSTextField(labelWithString: stat.trend)
            trend.font = .systemFont(ofSize: 12, weight: .semibold)
            trend.textColor = NSColor.systemGreen

            card.addArrangedSubview(value)
            card.addArrangedSubview(title)
            card.addArrangedSubview(trend)
            card.translatesAutoresizingMaskIntoConstraints = false
            card.widthAnchor.constraint(equalToConstant: 185).isActive = true
            card.heightAnchor.constraint(equalToConstant: 120).isActive = true
            return card
        }
        statGrid.addRow(with: cards)
    }

    private func configureRecommendations(_ recommendations: [JobRecommendation]) {
        recommendationsStack.orientation = .vertical
        recommendationsStack.spacing = 10
        recommendationsStack.alignment = .leading
        recommendationsStack.arrangedSubviews.forEach {
            recommendationsStack.removeArrangedSubview($0)
            $0.removeFromSuperview()
        }

        recommendations.forEach { recommendation in
            let row = NSStackView()
            row.orientation = .horizontal
            row.spacing = 12
            row.alignment = .centerY

            let icon = NSView()
            icon.wantsLayer = true
            icon.layer?.cornerRadius = 10
            icon.layer?.backgroundColor = NSColor(calibratedRed: 0.19, green: 0.34, blue: 0.9, alpha: 0.9).cgColor
            icon.translatesAutoresizingMaskIntoConstraints = false
            icon.widthAnchor.constraint(equalToConstant: 38).isActive = true
            icon.heightAnchor.constraint(equalToConstant: 38).isActive = true

            let textColumn = NSStackView()
            textColumn.orientation = .vertical
            textColumn.spacing = 2
            textColumn.alignment = .leading

            let title = NSTextField(labelWithString: recommendation.title)
            title.font = .systemFont(ofSize: 15, weight: .semibold)
            title.textColor = .white

            let subtitle = NSTextField(labelWithString: "\(recommendation.company) • \(recommendation.location)")
            subtitle.font = .systemFont(ofSize: 12, weight: .regular)
            subtitle.textColor = NSColor.white.withAlphaComponent(0.7)

            textColumn.addArrangedSubview(title)
            textColumn.addArrangedSubview(subtitle)

            let meta = NSStackView()
            meta.orientation = .vertical
            meta.alignment = .trailing

            let match = NSTextField(labelWithString: recommendation.matchRate)
            match.font = .systemFont(ofSize: 12, weight: .semibold)
            match.textColor = NSColor.systemGreen

            let posted = NSTextField(labelWithString: recommendation.postedAgo)
            posted.font = .systemFont(ofSize: 11, weight: .regular)
            posted.textColor = NSColor.white.withAlphaComponent(0.6)

            meta.addArrangedSubview(match)
            meta.addArrangedSubview(posted)

            row.addArrangedSubview(icon)
            row.addArrangedSubview(textColumn)
            row.addArrangedSubview(NSView())
            row.addArrangedSubview(meta)

            recommendationsStack.addArrangedSubview(row)
        }
    }

    private func configureInsights(_ insights: [InsightItem]) {
        insightsStack.orientation = .vertical
        insightsStack.spacing = 12
        insightsStack.alignment = .leading
        insightsStack.arrangedSubviews.forEach {
            insightsStack.removeArrangedSubview($0)
            $0.removeFromSuperview()
        }

        insights.forEach { insight in
            let card = NSStackView()
            card.orientation = .vertical
            card.spacing = 4
            card.edgeInsets = NSEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
            card.wantsLayer = true
            card.layer?.backgroundColor = NSColor(calibratedRed: 0.07, green: 0.12, blue: 0.22, alpha: 1).cgColor
            card.layer?.cornerRadius = 10

            let title = NSTextField(labelWithString: insight.title)
            title.font = .systemFont(ofSize: 14, weight: .semibold)
            title.textColor = .white

            let body = NSTextField(labelWithString: insight.description)
            body.font = .systemFont(ofSize: 12, weight: .regular)
            body.textColor = NSColor.white.withAlphaComponent(0.7)
            body.maximumNumberOfLines = 2
            body.lineBreakMode = .byWordWrapping

            card.addArrangedSubview(title)
            card.addArrangedSubview(body)
            insightsStack.addArrangedSubview(card)
        }
    }

    private func sectionBox(title: String, content: NSStackView) -> NSView {
        let box = NSStackView()
        box.orientation = .vertical
        box.spacing = 12
        box.alignment = .leading
        box.edgeInsets = NSEdgeInsets(top: 14, left: 14, bottom: 14, right: 14)
        box.wantsLayer = true
        box.layer?.backgroundColor = NSColor(calibratedRed: 0.05, green: 0.09, blue: 0.19, alpha: 1).cgColor
        box.layer?.cornerRadius = 16

        let titleLabel = NSTextField(labelWithString: title)
        titleLabel.font = .systemFont(ofSize: 18, weight: .semibold)
        titleLabel.textColor = .white
        box.addArrangedSubview(titleLabel)
        box.addArrangedSubview(content)
        return box
    }

    private func tagBubble(_ text: String) -> NSView {
        let label = NSTextField(labelWithString: text)
        label.font = .systemFont(ofSize: 11, weight: .medium)
        label.textColor = NSColor(calibratedRed: 0.75, green: 0.79, blue: 1, alpha: 1)
        label.wantsLayer = true
        label.layer?.backgroundColor = NSColor(calibratedRed: 0.2, green: 0.24, blue: 0.45, alpha: 0.5).cgColor
        label.layer?.cornerRadius = 7
        label.alignment = .center
        label.translatesAutoresizingMaskIntoConstraints = false
        label.widthAnchor.constraint(equalToConstant: 90).isActive = true
        return label
    }

    private func updateDocumentLayout() {
        documentContainer.layoutSubtreeIfNeeded()
        let fittingHeight = max(chromeContainer.fittingSize.height + 36, bounds.height)
        documentContainer.frame = NSRect(x: 0, y: 0, width: bounds.width, height: fittingHeight)
    }
}