//
//  IndeedLogoView.swift
//  App for Indeed
//

import Cocoa

/// Indeed wordmark (`indeed` in brand blue) for splash and branding surfaces.
enum IndeedBrandLogo {
    static let brandBlue = NSColor(srgbRed: 37 / 255, green: 87 / 255, blue: 167 / 255, alpha: 1)

    static func wordmarkImage(fittingHeight height: CGFloat) -> NSImage {
        let fontSize = height * 0.92
        let font = NSFont.systemFont(ofSize: fontSize, weight: .heavy)
        let text = "indeed" as NSString
        let attributes: [NSAttributedString.Key: Any] = [
            .font: font,
            .foregroundColor: brandBlue,
            .kern: -0.6
        ]
        let size = text.size(withAttributes: attributes)
        let canvas = NSSize(width: ceil(size.width) + 4, height: ceil(size.height) + 4)
        let image = NSImage(size: canvas)
        image.lockFocus()
        defer { image.unlockFocus() }
        NSColor.clear.set()
        NSRect(origin: .zero, size: canvas).fill()
        let origin = NSPoint(x: 2, y: (canvas.height - size.height) / 2)
        text.draw(at: origin, withAttributes: attributes)
        return image
    }
}

final class IndeedLogoView: NSView {
    private let imageView = NSImageView()
    private var displayHeight: CGFloat = 44

    override var intrinsicContentSize: NSSize {
        guard let image = imageView.image, image.size.height > 0 else {
            return NSSize(width: 140, height: displayHeight)
        }
        let aspect = image.size.width / image.size.height
        return NSSize(width: displayHeight * aspect, height: displayHeight)
    }

    init(displayHeight: CGFloat = 44) {
        self.displayHeight = displayHeight
        super.init(frame: .zero)
        setUp()
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    func setDisplayHeight(_ height: CGFloat) {
        displayHeight = height
        refreshImage()
        invalidateIntrinsicContentSize()
    }

    private func setUp() {
        translatesAutoresizingMaskIntoConstraints = false
        imageView.translatesAutoresizingMaskIntoConstraints = false
        imageView.imageScaling = .scaleProportionallyUpOrDown
        addSubview(imageView)
        NSLayoutConstraint.activate([
            imageView.leadingAnchor.constraint(equalTo: leadingAnchor),
            imageView.trailingAnchor.constraint(equalTo: trailingAnchor),
            imageView.topAnchor.constraint(equalTo: topAnchor),
            imageView.bottomAnchor.constraint(equalTo: bottomAnchor)
        ])
        refreshImage()
        setAccessibilityElement(true)
        setAccessibilityRole(.image)
        setAccessibilityLabel("Indeed")
    }

    private func refreshImage() {
        imageView.image = IndeedBrandLogo.wordmarkImage(fittingHeight: displayHeight)
    }
}